Search This Blog

Wednesday, August 7, 2024

Media cross-ownership in the United States



Media cross-ownership is the common ownership of multiple media sources by a single person or corporate entity. Media sources include radio, broadcast television, specialty and pay television, cable, satellite, Internet Protocol television (IPTV), newspapers, magazines and periodicals, music, film, book publishing, video games, search engines, social media, internet service providers, and wired and wireless telecommunications.

Much of the debate over concentration of media ownership in the United States has for many years focused specifically on the ownership of broadcast stations, cable stations, newspapers, and websites. Some have pointed to an increase in media merging and concentration of ownership which may correlate to decreased trust in 'mass' media.

Ownership of American media

Over time, both the number of media outlets and concentration of ownership have increased, translating to fewer companies owning more media outlets.

Digital

Also known as "Big Tech," a collection of five major digital media companies are also noted for their strong influence over their respective industries:

Alphabet
Owns search engine Google, video sharing site YouTube, proprietary rights to the open-source Android operating system, blog hosting site Blogger, Gmail e-mail service, and numerous other online media and software outlets.
Amazon
Owns the Amazon.com e-commerce marketplace, cloud computing platform AWS, video streaming service Amazon Prime Video, music streaming service Amazon Music, and video live streaming service Twitch. Amazon also owns Metro-Goldwyn-Mayer (MGM), Orion Pictures, MGM Television, premium cable channel and direct-to-consumer streaming service MGM+, and extensive film and television content libraries via MGM Holdings,  now known as Amazon MGM Studios.
Apple
Produces iPhone, iPad, Mac, Apple Watch and Apple TV products, the iOS, iPadOS, macOS, watchOS, and tvOS operating systems, music streaming service Apple Music, video streaming service Apple TV+, news aggregator Apple News, and gaming platform Apple Arcade.
Meta
Owns social networks Facebook and Instagram, messaging services Facebook Messenger and WhatsApp, and virtual reality platform Oculus VR.
Microsoft
Owns business-oriented social network LinkedIn, web portal MSN, search engine Bing, cloud computing platform Microsoft Azure, Xbox gaming consoles and related services, Office productivity suite, Outlook.com e-mail service, Skype video chat service, and Windows operating system. Microsoft is also the largest US video game publisher with its ownership of Xbox Game Studios, ZeniMax Media and Activision Blizzard See: List of mergers and acquisitions by Microsoft.

Video

The Walt Disney Company
Owns the ABC television network, cable networks ESPN, Disney Channel, Disney XD, Freeform, FX, FXX, FX Movie Channel, National Geographic, Nat Geo Wild, History, A&E and Lifetime, Disney Mobile, Disney Music Group, Disney Publishing Worldwide, production companies Walt Disney Pictures, Pixar Animation Studios, Lucasfilm, Marvel Studios, 20th Century Studios, Searchlight Pictures, ABC Audio (including three AM radio stations), Disney Consumer Products, and Disney Parks theme parks in several countries.
See: List of assets owned by The Walt Disney Company.
Netflix
Owns the largest subscription over-the-top video service in the United States; it also owns many of the films and television series released on the service. Netflix also owns DVD Netflix (dvd.netflix.com), a mail-order video rental service. Netflix also has close ties to Roku, Inc., which it spun off in 2008 to avoid self-dealing accusations but maintains a substantial investment and owns the Roku operating system used on a large proportion of smart televisions and set-top boxes.
NBCUniversal
Owns NBC, Telemundo, Universal Pictures, Illumination, Focus Features, DreamWorks Animation, 26 television stations in the United States and cable networks USA Network, Bravo, CNBC, MSNBC, Syfy, NBCSN, Golf Channel, E!, and NBC Sports Regional Networks. NBCUniversal is a subsidiary of Comcast, in turn controlled by the family of Ralph J. Roberts (with Ralph's son Brian L. Roberts being the largest shareholder).
See: List of assets owned by NBCUniversal.
Warner Bros. Discovery
Owns The CW television network (a joint venture with Paramount Global and Nexstar Media Group), cable networks HBO, CNN, Cinemax, Cartoon Network, Adult Swim, HLN, NBA TV, TBS, TNT, TruTV, Turner Classic Movies, Discovery Channel, TLC, Animal Planet, HGTV, Food Network, Magnolia Network, Cooking Channel, Travel Channel, ID, Oprah Winfrey Network, Science, production companies Warner Bros. Pictures, New Line Cinema, Castle Rock, Warner Bros. Television, Warner Bros. Interactive Entertainment, publishing company DC Entertainment, sports media companies Motor Trend Group, Turner Sports (owns Bleacher Report) and digital media company Otter Media (Owns Fullscreen, and Rooster Teeth). It also owns and operates Eurosport and TVN Group in Europe.
see: List of assets owned by Warner Bros. Discovery.
Paramount Global
Owns the CBS television network and The CW (a joint venture with Warner Bros. Discovery and Nexstar Media Group), cable networks CBS Sports Network, Showtime, Pop; 30 television stations; CBS Studios; MTV, Nickelodeon/Nick at Nite, TV Land, VH1, BET, CMT, Comedy Central, Logo TV, Paramount Network, Paramount Pictures, and Paramount Home Entertainment. The Redstone family, through National Amusements, holds a controlling stake in Paramount Global.
see: List of assets owned by Paramount Global.
Fox Corporation
Owns the Fox television network and MyNetworkTV, Fox News Group (Fox News Channel, Fox Business Network, Fox Weather, Fox News Radio, Fox News Talk, Fox Nation), Fox Sports (FS1, FS2, Fox Deportes, Big Ten Network (51%), Fox Sports Radio), Fox Television Stations, Bento Box Entertainment, and Tubi. Australian-American media magnate Rupert Murdoch and his family are the major stakeholders in Fox.
Sony Pictures Entertainment
Owns Sony Pictures Entertainment Motion Picture Group (including Columbia Pictures, TriStar Pictures, and Sony Pictures Animation) , Sony Pictures Television, and Crunchyroll. Sony Pictures Entertainment is a subsidiary of Sony, a Japanese conglomerate.
Lionsgate
Owns Lionsgate Films, Lionsgate Television, Lionsgate Interactive, and a variety of subsidiaries such as Summit Entertainment, Debmar-Mercury, and Starz Inc.
AMC Networks
Owns cable networks AMC, IFC, SundanceTV, WeTV, and 49.9% of BBC America. Owns film studios IFC Films and RLJE Films, and streaming services AMC+, Shudder, HIDIVE, Sundance Now, Allblk, and Acorn TV, and a minority stake in BritBox. James Dolan and his family have 67% voting power over the company.

Print

Due to cross-ownership restrictions in place for much of the 20th century limiting broadcasting and print assets, as well as difficulties in establishing synergy between the two media, print companies largely stay within the print medium.

The New York Times Company
In addition to The New York Times, the company also owns The New York Times Magazine, T: The New York Times Style Magazine, The New York Times Book Review, The New York Times International Edition, Wirecutter, Audm, and Serial Productions. Although publicly traded, its controlling Class B shares are privately held by the descendants of Adolph Ochs who acquired the newspaper in 1896.
Nash Holdings
Owns The Washington Post, whose subsidiaries include content management system provider Arc Publishing and media monetization platform Zeus Technology. Nash is owned by Jeff Bezos.
News Corp
Owns Dow Jones & Company (Wall Street Journal, Barron's, Investor's Business Daily, and MarketWatch), the New York Post, and book publisher HarperCollins. See: List of assets owned by News Corp. Both News Corp and Fox Corporation are controlled by the family of Rupert Murdoch.
Bloomberg L.P.
Owns Bloomberg News (Bloomberg Businessweek, Bloomberg Markets, Bloomberg Television, and Bloomberg Radio) and produces the Bloomberg Terminal which is used by financial professionals to access market data and news. Bloomberg is owned by and named after Michael Bloomberg.
Advance Publications
Owns magazine publisher Condé Nast (The New Yorker, Vogue, Bon Appétit, Architectural Digest, Condé Nast Traveler, Vanity Fair, Wired, GQ, and Allure), American City Business Journals, and a chain of local newspapers and regional news websites. The company also holds stakes in cable television provider Charter (which operates the Spectrum News and Spectrum Sports regional cable channels), the social news aggregation website Reddit, and Warner Bros. Discovery (see above). Advance is controlled by the descendants of S.I. Newhouse.
Hearst Communications
Owns a wide variety of newspapers and magazines including the San Francisco Chronicle, the Houston Chronicle, Cosmopolitan, Esquire, and King Features Syndicate (print syndicator). See: List of assets owned by Hearst Communications. Hearst was founded by William Randolph Hearst, whose descendants remain active in the company.
Gannett
Owns the national newspaper USA Today. Its largest non-national newspaper is The Arizona Republic in Phoenix, Arizona. Other significant newspapers include The Indianapolis Star, The Cincinnati Enquirer, The Tennessean in Nashville, Tennessee, The Courier-Journal in Louisville, Kentucky, the Democrat and Chronicle in Rochester, New York, The Des Moines Register, the Detroit Free Press and The News-Press in Fort Myers. The company also previously held several television stations, which are now the autonomous company Tegna Inc., and syndication company Multimedia Entertainment (the assets of which are now owned by Comcast). In November 2019, GateHouse Media merged with Gannett, creating the largest newspaper publisher in the United States, which adopted the Gannett name. Through the merger, Gannett is currently controlled by New Media Investment Group, which is owned by SoftBank Group through Fortress Investment Group. See: List of assets owned by Gannett.
Tribune Publishing
Second-largest owner of newspapers in the United States by total number of subscribers, which owns the Chicago Tribune, the New York Daily News, the Denver Post, The Mercury News, among other daily and weekly newspapers. Tribune Publishing is controlled by Alden Global Capital.

Record labels

Universal Music Group
Largest of the "Big Three" record labels. The company is majority-owned by public, with Tencent and Vivendi owning their minority stake.
Sony Music Group
Second-largest of the "Big Three" record labels. The company is owned by Sony.
Warner Music Group
Third-largest of the "Big Three" record labels. The company is majority-owned by Len Blavatnik's Access Industries, with Tencent owning a minority stake.

Video Gaming

Electronic Arts
Largest video game publisher in the United States.
Take-Two Interactive
Second-largest video game publisher in the United States.

Radio

Sirius XM Radio
Owns a monopoly on American satellite radio, as well as Pandora Radio, a prominent advertising-supported Internet radio platform. 72% of Sirius XM is owned by Liberty Media, which is controlled by John Malone.
iHeartMedia
Owns 858 radio stations, the radio streaming platform iHeartRadio, Premiere Networks (which in turn owns The Clay Travis and Buck Sexton Show, The Sean Hannity Show, The Glenn Beck Program, Coast to Coast AM, American Top 40, Delilah, and Fox Sports Radio, all being among the top national radio programs in their category), and previously held a stake in Live Nation and Sirius XM Radio as well as several television stations (later under the management of Newport Television, and now owned by separate companies). Also owns record chart company Mediabase.
Audacy
Owns 235 radio stations across 48 media markets and internet radio platform Audacy.
Cumulus Media
Owns 429 radio stations, including the former assets of Westwood One (which includes Transtar Radio Networks and Mutual Broadcasting System), Jones Radio Networks, Waitt Radio Networks, Satellite Music Network (all of the major satellite music radio services intended for relay through terrestrial stations), most of ABC's radio network offerings and stations, most of Watermark Inc. (except the American Top 40 franchise), a significant number of radio stations ranging from small to large markets, and distribution rights to CBS Radio News and National Football League radio broadcasts.
Townsquare Media
Owns 321 radio stations in 67 markets, including the assets of Regent Communications, Gap Broadcasting, and Double O Radio.

Local television

E. W. Scripps Company
Owns hundreds of television stations and networks Ion Television, Laff, Court TV, Ion Mystery, Grit, Bounce TV, and Newsy TV. Digital assets include United Media, Cracked.com, and Stitcher. Scripps previously held assets in radio, newspapers and cable television channels but has since divested those assets.
Gray Television
Owns television stations in 113 markets, including the assets of Hoak Media, Meredith Corporation, Quincy Media, Raycom Media, and Schurz Communications. Also co-manages the digital network Circle with the Grand Ole Opry. See: List of stations owned or operated by Gray Television.
Hearst Television
Owns 29 local television stations. It is the third-largest group owner of ABC-affiliated stations and the second-largest group owner of NBC affiliates. Parent company Hearst Communications owns 50% of broadcasting firm A&E Networks, and 20% of the sports broadcaster ESPN—the last two both co-owned with The Walt Disney Company. See: List of assets owned by Hearst Communications.
Nexstar Media Group
The largest television station owner in the United States owning 197 television stations across the U.S., most of whom are affiliated with the four "major" U.S. television networks. It also owns The CW (joint venture with Paramount Global via CBS and Warner Bros. Discovery), NewsNation (formerly WGN America) and digital networks Antenna TV and Rewind TV. See: List of stations owned or operated by Nexstar Media Group.
Sinclair Broadcast Group
It owns or operates a large number of television stations across the country that are affiliated with all six major television networks, including stations formerly owned by Allbritton Communications, Barrington Broadcasting, Fisher Communications, Newport Television (and predecessor Clear Channel) and Bally Sports. Other assets include the Tennis Channel, digital networks Comet, Charge! and TBD. See: List of stations owned or operated by Sinclair Broadcast Group.
Tegna Inc.
Owns or operates 66 television stations in 54 markets, and holds properties in digital media. Comprises the broadcast television and digital media divisions of the old Gannett Company.

History of FCC regulations

The First Amendment to the United States Constitution included a provision that protected "freedom of the press" from Congressional action. For newspapers and other print items, in which the medium itself was practically infinite and publishers could produce as many publications as they wanted without interfering with any other publisher's ability to do the same, this was not a problem.

The debut of radio broadcasting in the first part of the 20th century complicated matters; the radio spectrum is finite, and only a limited number of broadcasters could use the medium at the same time. The United States government opted to declare the entire broadcast spectrum to be government property and license the rights to use the spectrum to broadcasters. After several years of experimental broadcast licensing, the United States licensed its first commercial radio station, KDKA, in 1920.

Prior to 1927, public airwaves in the United States were regulated by the United States Department of Commerce and largely litigated in the courts as the growing number of stations fought for space in the burgeoning industry. In the earliest days, radio stations were typically required to share the same standard frequency (833 kHz) and were not allowed to broadcast an entire day, instead having to sign on and off at designated times to allow competing stations to use the frequency.

The Federal Radio Act of 1927 (signed into law February 23, 1927) nationalized the airwaves and formed the Federal Radio Commission, the forerunner of the modern Federal Communications Commission (FCC) to assume control of the airwaves. One of the first moves of the FRC was General Order 40, the first U.S. bandplan, which allocated permanent frequencies for most U.S. stations and eliminated most of the part-time broadcasters.

Communications Act of 1934

The Communications Act of 1934 was the stepping stone for all of the communications rules that are in place today. When first enacted, it created the FCC (Federal Communications Commission). It was created to regulate the telephone monopolies, but also regulate the licensing for the spectrum used for broadcasting. The FCC was given authority by Congress to give out licenses to companies to use the broadcasting spectrum. However, they had to determine whether the license would serve "the public interest, convenience, and necessity". The primary goal for the FCC, from the start, has been to serve the "public interest". A debated concept, the term "public interest" was provided with a general definition by the Federal Radio Commission. The Commission determined, in its 1928 annual report, that "the emphasis must be first and foremost on the interest, the convenience, and the necessity of the listening public, and not on the interest, convenience, or necessity of the individual broadcaster or the advertiser." Following this reasoning, early FCC regulations reflected the presumption that "it would not be in the public's interest for a single entity to hold more than one broadcast license in the same community. The view was that the public would benefit from a diverse array of owners because it would lead to a diverse array of program and service viewpoints."

The Communications Act of 1934 refined and expanded on the authority of the FCC to regulate public airwaves in the United States, combining and reorganizing provisions from the Federal Radio Act of 1927 and the Mann-Elkins Act of 1910. It empowered the FCC, among other things, to administer broadcasting licenses, impose penalties and regulate standards and equipment used on the airwaves. The Act also mandated that the FCC would act in the interest of the "public convenience, interest, or necessity." The Act established a system whereby the FCC grants licenses to the spectrum to broadcasters for commercial use, so long as the broadcasters act in the public interest by providing news programming.

Lobbyists from the largest radio broadcasters, ABC and NBC, wanted to establish high fees for broadcasting licenses, but Congress saw this as a limitation upon free speech. Consequently, "the franchise to operate a broadcasting station, often worth millions, is awarded free of charge to enterprises selected under the standard of 'public interest, convenience, or necessity.'"

Nevertheless, radio and television was dominated by the Big Three television networks until the mid-1990s, when the Fox network and UPN and The WB started to challenge that hegemony.

Cross-ownership rules of 1975

In 1975, the FCC passed the newspaper and broadcast cross-ownership rule. This ban prohibited the ownership of a daily newspaper and any "full-power broadcast station that serviced the same community". This rule emphasized the need to ensure that a broad number of voices were given the opportunity to communicate via different outlets in each market. Newspapers, explicitly prohibited from federal regulation because of the guarantee of freedom of the press in the First Amendment to the United States Constitution, were out of the FCC's jurisdiction, but the FCC could use the ownership of a newspaper as a preclusion against owning radio or television licenses, which the FCC could and did regulate.

The FCC designed rules to make sure that there is a diversity of voices and opinions on the airwaves. "Beginning in 1975, FCC rules banned cross-ownership by a single entity of a daily newspaper and television or radio broadcast station operating in the same local market." The ruling was put in place to limit media concentration in TV and radio markets, because they use public airwaves, which is a valuable, and now limited, resource.

Telecommunications Act 1996

The Telecommunications Act of 1996 was an influential act for media cross-ownership. One of the requirements of the act was that the FCC must conduct a biennial review of its media ownership rules "and shall determine whether any of such rules are necessary in the public interest as the result of competition." The Commission was ordered to "repeal or modify any regulation it determines to be no longer in the public interest."

The legislation, touted as a step that would foster competition, actually resulted in the subsequent mergers of several large companies, a trend which still continues. Over 4,000 radio stations were bought out, and minority ownership of TV stations dropped to its lowest point since the federal government began tracking such data in 1990.

Since the Telecommunications Act of 1996, restrictions on media merging have decreased. Although merging media companies seems to provide many positive outcomes for the companies involved in the merge, it might lead to some negative outcomes for other companies, viewers and future businesses. The FCC even found that they were indeed negative effects of recent merges in a study that they issued.

Since 21st century

In September 2002, the FCC issued a Notice of Proposed Rulemaking stating that the Commission would re-evaluate its media ownership rules pursuant to the obligation specified in the Telecommunications Act of 1996. In June 2003, after its deliberations which included a single public hearing and the review of nearly two-million pieces of correspondence from the public opposing further relaxation of the ownership rules the FCC voted 3-2 to repeal the newspaper/broadcast cross-ownership ban and to make changes to or repeal several of its other ownership rules as well. In the order, the FCC noted that the newspaper/broadcast cross-ownership rule was no longer necessary in the public interest to maintain competition, diversity or localism. However, in 2007 the FCC revised its rules and ruled that they would take it "case-by-case and determine if the cross-ownership would affect the public interest. The rule changes permitted a company to own a newspaper and broadcast station in any of the nation's top 20 media markets as long as there are at least eight media outlets in the market. If the combination included a television station, that station couldn't be in the market's top four. As it has since 2003, Prometheus Radio Project argued that the relaxed rule would pave the way for more media consolidation. Broadcasters, pointing to the increasing competition from new platforms, argued that the FCC's rules—including other ownership regulations that govern TV duopolies and radio ownership—should be relaxed even further. The FCC, meanwhile, defended its right to change the rules either way." That public interest is what the FCC bases its judgments on, whether a media cross-ownership would be a positive and contributive force, locally and nationally.

The FCC held one official forum, February 27, 2003, in Richmond, Virginia in response to public pressures to allow for more input on the issue of elimination of media ownership limits. Some complain that more than one forum was needed.

In 2003 the FCC set out to re-evaluate its media ownership rules specified in the Telecommunications Act of 1996. On June 2, 2003, FCC, in a 3-2 vote under Chairman Michael Powell, approved new media ownership laws that removed many of the restrictions previously imposed to limit ownership of media within a local area. The changes were not, as is customarily done, made available to the public for a comment period.

  • Single-company ownership of media in a given market is now permitted up to 45% (formerly 35%, up from 25% in 1985) of that market.
  • Restrictions on newspaper and TV station ownership in the same market were removed.
  • All TV channels, magazines, newspapers, cable, and Internet services are now counted, weighted based on people's average tendency to find news on that medium. At the same time, whether a channel actually contains news is no longer considered in counting the percentage of a medium owned by one owner.
  • Previous requirements for periodic review of license have been changed. Licenses are no longer reviewed for "public-interest" considerations.

The decision by the FCC was overturned by the United States Court of Appeals for the Third Circuit in Prometheus Radio Project v. FCC in June, 2004. The Majority ruled 2-1 against the FCC and ordered the Commission to reconfigure how it justified raising ownership limits. The Supreme Court later turned down an appeal, so the ruling stands.

In June 2006, the FCC adopted a Further Notice of Proposed Rulemaking (FNPR) to address the issues raised by the United States Court of Appeals for the Third Circuit and also to perform the recurring evaluation of the media ownership rules required by the Telecommunications Act. The deliberations would draw upon three formal sources of input:(1) the submission of comments, (2) ten Commissioned studies, and (3) six public hearings.

The FCC in 2007 voted to modestly relax its existing ban on newspaper/broadcast cross-ownership. The FCC voted December 18, 2007 to eliminate some media ownership rules, including a statute that forbids a single company to own both a newspaper and a television or radio station in the same city. FCC Chairman Kevin Martin circulated the plan in October 2007. Martin's justification for the rule change is to ensure the viability of America's newspapers and to address issues raised in the 2003 FCC decision that was later struck down by the courts. The FCC held six hearings around the country to receive public input from individuals, broadcasters and corporations. Because of the lack of discussion during the 2003 proceedings, increased attention has been paid to ensuring that the FCC engages in proper dialogue with the public regarding its current rules change. FCC Commissioners Deborah Taylor-Tate and Robert McDowell joined Chairman Martin in voting in favor of the rule change. Commissioners Michael Copps and Jonathan Adelstein, both Democrats, opposed the change.

UHF discount

Beginning in 1985, the FCC implemented a rule stating that television stations broadcasting on UHF channels would be "discounted" by half when calculating a broadcaster's total reach, under the market share cap of 39% of U.S. TV households. This rule was implemented because the UHF band was generally considered inferior to VHF for broadcasting analog television. The notion became obsolete since the completion of the transition from analog to digital television in 2009; the majority of television stations now broadcast on the UHF band because, by contrast, it is generally considered superior for digital transmission.

The FCC voted to deprecate the rule in September 2016; the Commission argued that the UHF discount had become technologically obsolete, and that it was now being used as a loophole by broadcasters to contravene its market share rules and increase their market share through consolidation. The existing portfolios of broadcasters who now exceeded the cap due to the change were grandfathered, including the holdings of Ion Media Networks, Tribune Media, and Univision.

However, on April 21, 2017, under new Trump administration FCC commissioner Ajit Pai, the discount was reinstated in a 2-1 vote, led by Pai and commissioner Michael O'Rielly. The move, along with a plan to evaluate increasing the national ownership cap, is expected to trigger a wider wave of consolidation in broadcast television. A challenge to the rule's restoration was filed on May 15 by The Institute for Public Representation (a coalition of public interest groups comprising Free Press, the United Church of Christ, Media Mobilizing Project, the Prometheus Radio Project, the National Hispanic Media Coalition and Common Cause), which requested an emergency motion to stay the UHF discount order – delaying its June 5 re-implementation – pending a court challenge to the rule. The groups re-affirmed that the rule was technologically obsolete, and was restored for the purpose of allowing media consolidation. The FCC rejected the claims, stating that the discount would only allow forward a regulatory review of any station group acquisitions, and that the Institute for Public Representation's criteria for the stay fell short of meeting adequate determination in favor of it by the court; it also claimed that the discount was "inextricably linked" to the agency's media ownership rules, a review of which it initiated in May of that year.

The challenge and subsequent stay motion was partly filed as a reaction to Sinclair Broadcast Group's proposed acquisition of Tribune Media (announced on May 8), which – with the more than 230 stations that the combined company would have, depending on any divestitures in certain markets where both groups own stations – would expand the group's national reach to 78% of all U.S. households with at least one television set with the discount. On June 1, 2017, the District of Columbia Court of Appeals issued a seven-day administrative stay to the UHF discount rulemaking to review the emergency stay motion. The D.C. Court of Appeals denied the emergency stay motion in a one-page memorandum on June 15, 2017, however, the merits of restoring the discount is still subject to a court appeal proceeding scheduled to occur at a later date.

Following this, in November 2017, the FCC voted 3-2 along partisan lines to eliminate the cross-ownership ban against owning multiple media outlets in the same local market, as well as increasing the number of television stations that one entity may own in a local market. Pai argued the removal of the ban was necessary for local media to compete with online information sources like Google and Facebook. The decision was appealed by advocacy groups, and in September 2019, the Third Circuit struck down the rule change in a 2-1 decision, with the majority opinion stating the FCC "did not adequately consider the effect its sweeping rule changes will have on ownership of broadcast media by women and racial minorities." Pai stated plans to appeal this ruling. The FCC petitioned to the Supreme Court under FCC v. Prometheus Radio Project. The Supreme Court ruled unanimously in April 2021 to reverse the Third Circuit's ruling, stating that the FCC's rule changes did not violate the Administrative Procedure Act, and that there was no Congressional mandate for the FCC to consider the impact on minority ownership of its rulemaking, thus allowing the FCC to proceed with relaxation of media cross-ownership rules.

Local content

A 2008 study found that news stations operated by a small media company produced more local news and more locally produced video than large chain-based broadcasting groups. It was then argued that the FCC claimed, in 2003, that larger media groups produced better quality local content. Research by Philip Napoli and Michael Yan showed that larger media groups actually produced less local content. In a different study, they also showed that "ownership by one of the big four broadcast networks has been linked to a considerable decrease in the amount of televised local public affairs programming"

The major reasoning the FCC made for deregulation was that with more capital, broadcasting organizations could produce more and better local content. However, the research studies by Napoli and Yan showed that once teamed-up, they produced less content. Cross ownership between broadcasting and newspapers is a complicated issue. The FCC believes that more deregulation is necessary. However, with research studies showing that they produced less local content - less voices being heard that are from within the communities. While less local voices are heard, more national-based voices do appear. Chain-based companies are using convergence, the same content being produced across multiple mediums, to produce this mass-produced content. It is cheaper and more efficient than having to run different local and national news. However, with convergence and chain-based ownership you can choose which stories to run and how the stories are heard - being able to be played in local communities and national stage.

Media consolidation debate

Robert W. McChesney

Robert McChesney is an advocate for media reform, and the co-founder of Free Press, which was established in 2003. His work is based on theoretical, normative, and empirical evidence suggesting that media regulation efforts should be more strongly oriented towards maintaining a healthy balance of diverse viewpoints in the media environment. However, his viewpoints on current regulation are; "there is every bit as much regulation by government as before, only now it is more explicitly directed to serve large corporate interests."

McChesney believes that the Free Press' objective is a more diverse and competitive commercial system with a significant nonprofit and noncommercial sector. It would be a system built for the citizens, but most importantly - it would be accessible to anyone who wants to broadcast. Not only specifically the big corporations that can afford to broadcast nationally, but more importantly locally. McChesney suggests that to better our current system we need to "establish a bona fide noncommercial public radio and television system, with local and national stations and networks. The expense should come out of the general budget"

Benjamin Compaine

Benjamin Compaine believes that the current media system is "one of the most competitive major industries in U.S. commerce." He believes that much of the media in the United States is operating in the same market. He also believes that all the content is being interchanged between different media.

Compaine believes that due to convergence, two or more things coming together, the media has been saved. Because of the ease of access to send the same message across multiple and different mediums, the message is more likely to be heard. He also believes that due to the higher amount of capital and funding, the media outlets are able to stay competitive because they are trying to reach more listeners or readers by using newer media.

Benjamin Compaine's main argument is that the consolidation of media outlets, across multiple ownerships, has allowed for a better quality of content. He also stated that the news is interchangeable, and as such, making the media market less concentrated than previously thought, the idea being that since the same story is being pushed across multiple different platforms, then it can only be counted as one news story from multiple sources. Compaine also believed the news is more readily available, making it far easier for individuals to access than traditional methods.

American public distrust in the media

A 2012 Gallup poll found that Americans' distrust in the mass media had hit a new high, with 60% saying they had little or no trust in the mass media to report the news fully, accurately, and fairly. Distrust had increased since the previous few years, when Americans were already more negative about the media than they had been in the years before 2004.

Music industry

Critics of media consolidation in broadcast radio say it has made the music played more homogeneous, and makes it more difficult for acts to gain local popularity. They also believe it has reduced the demographic diversity of popular music, pointing to a study which found representation of women in country music charts at 11.3% from 2000 to 2018.

Critics cite centralized control as having increased artist self-censorship, and several incidents of artists being banned from a large number of broadcast stations all at once. After the controversy caused by criticism of President George W. Bush and the Iraq War by a member of the Dixie Chicks, the band was banned by Cumulus Media and Clear Channel Communications, which also organized pro-war demonstrations. After the Super Bowl XXXVIII wardrobe malfunction, CBS CEO Les Moonves reportedly banned Janet Jackson from all CBS and Viacom properties, including MTV, VH1, the 46th Annual Grammy Awards, and Infinity Broadcasting Corporation radio stations, impacting sales of her album Damita Jo.

News

Critics point out that media consolidation has allowed Sinclair Broadcast Group to require hundreds of local stations to run editorials by Boris Epshteyn (an advisor to Donald Trump), terrorism alerts, and anti-John Kerry documentary Stolen Honor, and even to force local news anchors to read an editorial mirroring Trump's denunciation of the news media for bias and fake news.

Acute radiation syndrome

From Wikipedia, the free encyclopedia
 
Acute radiation syndrome
Other namesRadiation poisoning, radiation sickness, radiation toxicity
Radiation causes cellular degradation by autophagy.
SpecialtyCritical care medicine
SymptomsEarly: Nausea, vomiting, skin burns, loss of appetite
Later: Infections, bleeding, dehydration, confusion
ComplicationsCancer
Usual onsetWithin days
TypesBone marrow syndrome, gastrointestinal syndrome, neurovascular syndrome
CausesLarge amounts of ionizing radiation over a short period of time
Diagnostic methodBased on history of exposure and symptoms
TreatmentSupportive care (blood transfusions, antibiotics, colony stimulating factors, stem cell transplant)
PrognosisDepends on the exposure dose
FrequencyRare

Acute radiation syndrome (ARS), also known as radiation sickness or radiation poisoning, is a collection of health effects that are caused by being exposed to high amounts of ionizing radiation in a short period of time. Symptoms can start within an hour of exposure, and can last for several months. Early symptoms are usually nausea, vomiting and loss of appetite. In the following hours or weeks, initial symptoms may appear to improve, before the development of additional symptoms, after which either recovery or death follow.

ARS involves a total dose of greater than 0.7 Gy (70 rad), that generally occurs from a source outside the body, delivered within a few minutes. Sources of such radiation can occur accidentally or intentionally. They may involve nuclear reactors, cyclotrons, certain devices used in cancer therapy, nuclear weapons, or radiological weapons. It is generally divided into three types: bone marrow, gastrointestinal, and neurovascular syndrome, with bone marrow syndrome occurring at 0.7 to 10 Gy, and neurovascular syndrome occurring at doses that exceed 50 Gy. The cells that are most affected are generally those that are rapidly dividing. At high doses, this causes DNA damage that may be irreparable. Diagnosis is based on a history of exposure and symptoms. Repeated complete blood counts (CBCs) can indicate the severity of exposure.

Treatment of ARS is generally supportive care. This may include blood transfusions, antibiotics, colony-stimulating factors, or stem cell transplant. Radioactive material remaining on the skin or in the stomach should be removed. If radioiodine was inhaled or ingested, potassium iodide is recommended. Complications such as leukemia and other cancers among those who survive are managed as usual. Short-term outcomes depend on the dose exposure.

ARS is generally rare. A single event can affect a large number of people, as happened in the atomic bombings of Hiroshima and Nagasaki and the Chernobyl nuclear power plant disaster. ARS differs from chronic radiation syndrome, which occurs following prolonged exposures to relatively low doses of radiation.

Signs and symptoms

Radiation sickness

Classically, ARS is divided into three main presentations: hematopoietic, gastrointestinal, and neurovascular. These syndromes may be preceded by a prodrome. The speed of symptom onset is related to radiation exposure, with greater doses resulting in a shorter delay in symptom onset. These presentations presume whole-body exposure, and many of them are markers that are invalid if the entire body has not been exposed. Each syndrome requires that the tissue showing the syndrome itself be exposed (e.g., gastrointestinal syndrome is not seen if the stomach and intestines are not exposed to radiation). Some areas affected are:

  1. Hematopoietic. This syndrome is marked by a drop in the number of blood cells, called aplastic anemia. This may result in infections, due to a low number of white blood cells, bleeding, due to a lack of platelets, and anemia, due to too few red blood cells in circulation. These changes can be detected by blood tests after receiving a whole-body acute dose as low as 0.25 grays (25 rad), though they might never be felt by the patient if the dose is below 1 gray (100 rad). Conventional trauma and burns resulting from a bomb blast are complicated by the poor wound healing caused by hematopoietic syndrome, increasing mortality.
  2. Gastrointestinal. This syndrome often follows absorbed doses of 6–30 grays (600–3,000 rad).[3] The signs and symptoms of this form of radiation injury include nausea, vomiting, loss of appetite, and abdominal pain. Vomiting in this time-frame is a marker for whole body exposures that are in the fatal range above 4 grays (400 rad). Without exotic treatment such as bone marrow transplant, death with this dose is common, due generally more to infection than gastrointestinal dysfunction.
  3. Neurovascular. This syndrome typically occurs at absorbed doses greater than 30 grays (3,000 rad), though it may occur at doses as low as 10 grays (1,000 rad). It presents with neurological symptoms such as dizziness, headache, or decreased level of consciousness, occurring within minutes to a few hours, with an absence of vomiting, and is almost always fatal, even with aggressive intensive care.

Early symptoms of ARS typically include nausea, vomiting, headaches, fatigue, fever, and a short period of skin reddening. These symptoms may occur at radiation doses as low as 0.35 grays (35 rad). These symptoms are common to many illnesses, and may not, by themselves, indicate acute radiation sickness.

Dose effects

Phase Symptom Whole-body absorbed dose (Gy)
1–2 Gy 2–6 Gy 6–8 Gy 8–30 Gy > 30 Gy
Immediate Nausea and vomiting 5–50% 50–100% 75–100% 90–100% 100%
Time of onset 2–6 h 1–2 h 10–60 min < 10 min Minutes
Duration < 24 h 24–48 h < 48 h < 48 h — (patients die in < 48 h)
Diarrhea None None to mild (< 10%) Heavy (> 10%) Heavy (> 95%) Heavy (100%)
Time of onset 3–8 h 1–3 h < 1 h < 1 h
Headache Slight Mild to moderate (50%) Moderate (80%) Severe (80–90%) Severe (100%)
Time of onset 4–24 h 3–4 h 1–2 h < 1 h
Fever None Moderate increase (10–100%) Moderate to severe (100%) Severe (100%) Severe (100%)
Time of onset 1–3 h < 1 h < 1 h < 1 h
CNS function No impairment Cognitive impairment 6–20 h Cognitive impairment > 24 h Rapid incapacitation Seizures, tremor, ataxia, lethargy
Latent period
28–31 days 7–28 days < 7 days None None
Illness
Mild to moderate Leukopenia
Fatigue
Weakness
Moderate to severe Leukopenia
Purpura
Hemorrhage
Infections
Alopecia after 3 Gy
Severe leukopenia
High fever
Diarrhea
Vomiting
Dizziness and disorientation
Hypotension
Electrolyte disturbance
Nausea
Vomiting
Severe diarrhea
High fever
Electrolyte disturbance
Shock
— (patients die in < 48h)
Mortality Without care 0–5% 5–95% 95–100% 100% 100%
With care 0–5% 5–50% 50–100% 99–100% 100%
Death 6–8 weeks 4–6 weeks 2–4 weeks 2 days – 2 weeks 1–2 days

A similar table and description of symptoms (given in rems, where 100 rem = 1 Sv), derived from data from the effects on humans subjected to the atomic bombings of Hiroshima and Nagasaki, the indigenous peoples of the Marshall Islands subjected to the Castle Bravo thermonuclear bomb, animal studies and lab experiment accidents, have been compiled by the U.S. Department of Defense.

A person who was less than 1 mile (1.6 km) from the atomic bomb Little Boy's hypocenter at Hiroshima, Japan, was found to have absorbed about 9.46 grays (Gy) of ionizing radiation. The doses at the hypocenters of the Hiroshima and Nagasaki atomic bombings were 240 and 290 Gy, respectively.

Skin changes

Harry K. Daghlian's hand 9 days after he had manually stopped a prompt critical fission reaction during an accident with what later obtained the nickname the demon core. He received a dose of 5.1 Sv, or 3.1 Gy. He died 16 days after this photo was taken.

Cutaneous radiation syndrome (CRS) refers to the skin symptoms of radiation exposure. Within a few hours after irradiation, a transient and inconsistent redness (associated with itching) can occur. Then, a latent phase may occur and last from a few days up to several weeks, when intense reddening, blistering, and ulceration of the irradiated site is visible. In most cases, healing occurs by regenerative means; however, very large skin doses can cause permanent hair loss, damaged sebaceous and sweat glands, atrophy, fibrosis (mostly keloids), decreased or increased skin pigmentation, and ulceration or necrosis of the exposed tissue.

As seen at Chernobyl, when skin is irradiated with high energy beta particles, moist desquamation (peeling of skin) and similar early effects can heal, only to be followed by the collapse of the dermal vascular system after two months, resulting in the loss of the full thickness of the exposed skin. Another example of skin loss caused by high-level exposure of radiation is during the 1999 Tokaimura nuclear accident, where technician Hisashi Ouchi had lost a majority of his skin due to the high amounts of radiation he absorbed during the irradiation. This effect had been demonstrated previously with pig skin using high energy beta sources at the Churchill Hospital Research Institute, in Oxford.

Cause

Both dose and dose rate contribute to the severity of acute radiation syndrome. The effects of dose fractionation or rest periods before repeated exposure also shift the LD50 dose upwards.
Comparison of Radiation Doses – includes the amount detected on the trip from Earth to Mars by the RAD on the MSL (2011–2013).

ARS is caused by exposure to a large dose of ionizing radiation (> ~0.1 Gy) over a short period of time (> ~0.1 Gy/h). Alpha and beta radiation have low penetrating power and are unlikely to affect vital internal organs from outside the body. Any type of ionizing radiation can cause burns, but alpha and beta radiation can only do so if radioactive contamination or nuclear fallout is deposited on the individual's skin or clothing.

Gamma and neutron radiation can travel much greater distances and penetrate the body easily, so whole-body irradiation generally causes ARS before skin effects are evident. Local gamma irradiation can cause skin effects without any sickness. In the early twentieth century, radiographers would commonly calibrate their machines by irradiating their own hands and measuring the time to onset of erythema.

Accidental

Accidental exposure may be the result of a criticality or radiotherapy accident. There have been numerous criticality accidents dating back to atomic testing during World War II, while computer-controlled radiation therapy machines such as Therac-25 played a major part in radiotherapy accidents. The latter of the two is caused by the failure of equipment software used to monitor the radiational dose given. Human error has played a large part in accidental exposure incidents, including some of the criticality accidents, and larger scale events such as the Chernobyl disaster. Other events have to do with orphan sources, in which radioactive material is unknowingly kept, sold, or stolen. The Goiânia accident is an example, where a forgotten radioactive source was taken from a hospital, resulting in the deaths of 4 people from ARS. Theft and attempted theft of radioactive material by clueless thieves has also led to lethal exposure in at least one incident.

Exposure may also come from routine spaceflight and solar flares that result in radiation effects on earth in the form of solar storms. During spaceflight, astronauts are exposed to both galactic cosmic radiation (GCR) and solar particle event (SPE) radiation. The exposure particularly occurs during flights beyond low Earth orbit (LEO). Evidence indicates past SPE radiation levels that would have been lethal for unprotected astronauts. GCR levels that might lead to acute radiation poisoning are less well understood. The latter cause is rarer, with an event possibly occurring during the solar storm of 1859.

Intentional

Scientific testing on humans within the United States occurred extensively throughout the atomic age. Experiments took place on a range of subjects including, but not limited to; the disabled, children, soldiers, and incarcerated persons, with the level of understanding and consent given by subjects varying from complete to none. Since 1997 there have been requirements for patients to give informed consent, and to be notified if experiments were classified. Across the world, the Soviet nuclear program involved human experiments on a large scale, which is still kept secret by the Russian government and the Rosatom agency. The human experiments that fall under intentional ARS exclude those that involved long term exposure. Criminal activity has involved murder and attempted murder carried out through abrupt victim contact with a radioactive substance such as polonium or plutonium.

Pathophysiology

The most commonly used predictor of ARS is the whole-body absorbed dose. Several related quantities, such as the equivalent dose, effective dose, and committed dose, are used to gauge long-term stochastic biological effects such as cancer incidence, but they are not designed to evaluate ARS. To help avoid confusion between these quantities, absorbed dose is measured in units of grays (in SI, unit symbol Gy) or rad (in CGS), while the others are measured in sieverts (in SI, unit symbol Sv) or rem (in CGS). 1 rad = 0.01 Gy and 1 rem = 0.01 Sv.

In most of the acute exposure scenarios that lead to radiation sickness, the bulk of the radiation is external whole-body gamma, in which case the absorbed, equivalent, and effective doses are all equal. There are exceptions, such as the Therac-25 accidents and the 1958 Cecil Kelley criticality accident, where the absorbed doses in Gy or rad are the only useful quantities, because of the targeted nature of the exposure to the body.

Radiotherapy treatments are typically prescribed in terms of the local absorbed dose, which might be 60 Gy or higher. The dose is fractionated to about 2 Gy per day for curative treatment, which allows normal tissues to undergo repair, allowing them to tolerate a higher dose than would otherwise be expected. The dose to the targeted tissue mass must be averaged over the entire body mass, most of which receives negligible radiation, to arrive at a whole-body absorbed dose that can be compared to the table above.

DNA damage

Exposure to high doses of radiation causes DNA damage, later creating serious and even lethal chromosomal aberrations if left unrepaired. Ionizing radiation can produce reactive oxygen species, and does directly damage cells by causing localized ionization events. The former is very damaging to DNA, while the latter events create clusters of DNA damage. This damage includes loss of nucleobases and breakage of the sugar-phosphate backbone that binds to the nucleobases. The DNA organization at the level of histones, nucleosomes, and chromatin also affects its susceptibility to radiation damage. Clustered damage, defined as at least two lesions within a helical turn, is especially harmful. While DNA damage happens frequently and naturally in the cell from endogenous sources, clustered damage is a unique effect of radiation exposure. Clustered damage takes longer to repair than isolated breakages, and is less likely to be repaired at all. Larger radiation doses are more prone to cause tighter clustering of damage, and closely localized damage is increasingly less likely to be repaired.

Somatic mutations cannot be passed down from parent to offspring, but these mutations can propagate in cell lines within an organism. Radiation damage can also cause chromosome and chromatid aberrations, and their effects depend on in which stage of the mitotic cycle the cell is when the irradiation occurs. If the cell is in interphase, while it is still a single strand of chromatin, the damage will be replicated during the S1 phase of the cell cycle, and there will be a break on both chromosome arms; the damage then will be apparent in both daughter cells. If the irradiation occurs after replication, only one arm will bear the damage; this damage will be apparent in only one daughter cell. A damaged chromosome may cyclize, binding to another chromosome, or to itself.

Diagnosis

Diagnosis is typically made based on a history of significant radiation exposure and suitable clinical findings. An absolute lymphocyte count can give a rough estimate of radiation exposure. Time from exposure to vomiting can also give estimates of exposure levels if they are less than 10 Gy (1000 rad).

Prevention

A guiding principle of radiation safety is as low as reasonably achievable (ALARA). This means try to avoid exposure as much as possible and includes the three components of time, distance, and shielding.

Time

The longer that humans are subjected to radiation the larger the dose will be. The advice in the nuclear war manual entitled Nuclear War Survival Skills published by Cresson Kearny in the U.S. was that if one needed to leave the shelter then this should be done as rapidly as possible to minimize exposure.

In chapter 12, he states that "[q]uickly putting or dumping wastes outside is not hazardous once fallout is no longer being deposited. For example, assume the shelter is in an area of heavy fallout and the dose rate outside is 400 roentgen (R) per hour, enough to give a potentially fatal dose in about an hour to a person exposed in the open. If a person needs to be exposed for only 10 seconds to dump a bucket, in this 1/360 of an hour he will receive a dose of only about 1 R. Under war conditions, an additional 1-R dose is of little concern." In peacetime, radiation workers are taught to work as quickly as possible when performing a task that exposes them to radiation. For instance, the recovery of a radioactive source should be done as quickly as possible.

Shielding

Matter attenuates radiation in most cases, so placing any mass (e.g., lead, dirt, sandbags, vehicles, water, even air) between humans and the source will reduce the radiation dose. This is not always the case, however; care should be taken when constructing shielding for a specific purpose. For example, although high atomic number materials are very effective in shielding photons, using them to shield beta particles may cause higher radiation exposure due to the production of bremsstrahlung x-rays, and hence low atomic number materials are recommended. Also, using material with a high neutron activation cross section to shield neutrons will result in the shielding material itself becoming radioactive and hence more dangerous than if it were not present.

There are many types of shielding strategies that can be used to reduce the effects of radiation exposure. Internal contamination protective equipment such as respirators are used to prevent internal deposition as a result of inhalation and ingestion of radioactive material. Dermal protective equipment, which protects against external contamination, provides shielding to prevent radioactive material from being deposited on external structures. While these protective measures do provide a barrier from radioactive material deposition, they do not shield from externally penetrating gamma radiation. This leaves anyone exposed to penetrating gamma rays at high risk of ARS.

Naturally, shielding the entire body from high energy gamma radiation is optimal, but the required mass to provide adequate attenuation makes functional movement nearly impossible. In the event of a radiation catastrophe, medical and security personnel need mobile protection equipment in order to safely assist in containment, evacuation, and many other necessary public safety objectives.

Research has been done exploring the feasibility of partial body shielding, a radiation protection strategy that provides adequate attenuation to only the most radio-sensitive organs and tissues inside the body. Irreversible stem cell damage in the bone marrow is the first life-threatening effect of intense radiation exposure and therefore one of the most important bodily elements to protect. Due to the regenerative property of hematopoietic stem cells, it is only necessary to protect enough bone marrow to repopulate the exposed areas of the body with the shielded supply. This concept allows for the development of lightweight mobile radiation protection equipment, which provides adequate protection, deferring the onset of ARS to much higher exposure doses. One example of such equipment is the 360 gamma, a radiation protection belt that applies selective shielding to protect the bone marrow stored in the pelvic area as well as other radio sensitive organs in the abdominal region without hindering functional mobility.

Reduction of incorporation

Where radioactive contamination is present, an elastomeric respirator, dust mask, or good hygiene practices may offer protection, depending on the nature of the contaminant. Potassium iodide (KI) tablets can reduce the risk of cancer in some situations due to slower uptake of ambient radioiodine. Although this does not protect any organ other than the thyroid gland, their effectiveness is still highly dependent on the time of ingestion, which would protect the gland for the duration of a twenty-four-hour period. They do not prevent ARS as they provide no shielding from other environmental radionuclides.

Fractionation of dose

If an intentional dose is broken up into a number of smaller doses, with time allowed for recovery between irradiations, the same total dose causes less cell death. Even without interruptions, a reduction in dose rate below 0.1 Gy/h also tends to reduce cell death. This technique is routinely used in radiotherapy.

The human body contains many types of cells and a human can be killed by the loss of a single type of cells in a vital organ. For many short term radiation deaths (3–30 days), the loss of two important types of cells that are constantly being regenerated causes death. The loss of cells forming blood cells (bone marrow) and the cells in the digestive system (microvilli, which form part of the wall of the intestines) is fatal.

Management

Effect of medical care on acute radiation syndrome

Treatment usually involves supportive care with possible symptomatic measures employed. The former involves the possible use of antibiotics, blood products, colony stimulating factors, and stem cell transplant.

Antimicrobials

There is a direct relationship between the degree of the neutropenia that emerges after exposure to radiation and the increased risk of developing infection. Since there are no controlled studies of therapeutic intervention in humans, most of the current recommendations are based on animal research.

The treatment of established or suspected infection following exposure to radiation (characterized by neutropenia and fever) is similar to the one used for other febrile neutropenic patients. However, important differences between the two conditions exist. Individuals that develop neutropenia after exposure to radiation are also susceptible to irradiation damage in other tissues, such as the gastrointestinal tract, lungs and central nervous system. These patients may require therapeutic interventions not needed in other types of neutropenic patients. The response of irradiated animals to antimicrobial therapy can be unpredictable, as was evident in experimental studies where metronidazole and pefloxacin therapies were detrimental.

Antimicrobials that reduce the number of the strict anaerobic component of the gut flora (i.e., metronidazole) generally should not be given because they may enhance systemic infection by aerobic or facultative bacteria, thus facilitating mortality after irradiation.

An empirical regimen of antimicrobials should be chosen based on the pattern of bacterial susceptibility and nosocomial infections in the affected area and medical center and the degree of neutropenia. Broad-spectrum empirical therapy (see below for choices) with high doses of one or more antibiotics should be initiated at the onset of fever. These antimicrobials should be directed at the eradication of Gram-negative aerobic bacilli (i.e., Enterobacteriaceae, Pseudomonas) that account for more than three quarters of the isolates causing sepsis. Because aerobic and facultative Gram-positive bacteria (mostly alpha-hemolytic streptococci) cause sepsis in about a quarter of the victims, coverage for these organisms may also be needed.

A standardized management plan for people with neutropenia and fever should be devised. Empirical regimens contain antibiotics broadly active against Gram-negative aerobic bacteria (quinolones: i.e., ciprofloxacin, levofloxacin, a third- or fourth-generation cephalosporin with pseudomonal coverage: e.g., cefepime, ceftazidime, or an aminoglycoside: i.e. gentamicin, amikacin).

Prognosis

The prognosis for ARS is dependent on the exposure dose, with anything above 8 Gy being almost always lethal, even with medical care. Radiation burns from lower-level exposures usually manifest after 2 months, while reactions from the burns occur months to years after radiation treatment. Complications from ARS include an increased risk of developing radiation-induced cancer later in life. According to the controversial but commonly applied linear no-threshold model, any exposure to ionizing radiation, even at doses too low to produce any symptoms of radiation sickness, can induce cancer due to cellular and genetic damage. The probability of developing cancer is a linear function with respect to the effective radiation dose. Radiation cancer may occur after ionizing radiation exposure following a latent period averaging 20 to 40 years.

History

Acute effects of ionizing radiation were first observed when Wilhelm Röntgen intentionally subjected his fingers to X-rays in 1895. He published his observations concerning the burns that developed that eventually healed, and misattributed them to ozone. Röntgen believed the free radical produced in air by X-rays from the ozone was the cause, but other free radicals produced within the body are now understood to be more important. David Walsh first established the symptoms of radiation sickness in 1897.

Ingestion of radioactive materials caused many radiation-induced cancers in the 1930s, but no one was exposed to high enough doses at high enough rates to bring on ARS.

The atomic bombings of Hiroshima and Nagasaki resulted in high acute doses of radiation to a large number of Japanese people, allowing for greater insight into its symptoms and dangers. Red Cross Hospital Surgeon Terufumi Sasaki led intensive research into the syndrome in the weeks and months following the Hiroshima and Nagasaki bombings. Sasaki and his team were able to monitor the effects of radiation in patients of varying proximities to the blast itself, leading to the establishment of three recorded stages of the syndrome. Within 25–30 days of the explosion, Sasaki noticed a sharp drop in white blood cell count and established this drop, along with symptoms of fever, as prognostic standards for ARS. Actress Midori Naka, who was present during the atomic bombing of Hiroshima, was the first incident of radiation poisoning to be extensively studied. Her death on 24 August 1945 was the first death ever to be officially certified as a result of ARS (or "Atomic bomb disease").

There are two major databases that track radiation accidents: The American ORISE REAC/TS and the European IRSN ACCIRAD. REAC/TS shows 417 accidents occurring between 1944 and 2000, causing about 3000 cases of ARS, of which 127 were fatal. ACCIRAD lists 580 accidents with 180 ARS fatalities for an almost identical period. The two deliberate bombings are not included in either database, nor are any possible radiation-induced cancers from low doses. The detailed accounting is difficult because of confounding factors. ARS may be accompanied by conventional injuries such as steam burns, or may occur in someone with a pre-existing condition undergoing radiotherapy. There may be multiple causes for death, and the contribution from radiation may be unclear. Some documents may incorrectly refer to radiation-induced cancers as radiation poisoning, or may count all overexposed individuals as survivors without mentioning if they had any symptoms of ARS.

Notable cases

The following table includes only those known for their attempted survival with ARS. These cases exclude chronic radiation syndrome such as Albert Stevens, in which radiation is exposed to a given subject over a long duration. The table also necessarily excludes cases where the individual was exposed to so much radiation that death occurred before medical assistance or dose estimations could be made, such as an attempted cobalt-60 thief who reportedly died 30 minutes after exposure. The result column represents the time of exposure to the time of death attributed to the short and long term effects attributed to initial exposure. As ARS is measured by a whole-body absorbed dose, the exposure column only includes units of gray (Gy).

Date Name Exposure (Gy or Sv) Incident/accident Result
August 21, 1945 Harry Daghlian 3.1 Gy Harry Daghlian criticality accident Death in 25 days
May 21, 1946 Louis Slotin 11 Gy Slotin criticality accident Death in 9 days
Alvin C. Graves 1.9 Gy Death in 19 years
December 30, 1958 Cecil Kelley 36 Gy Cecil Kelley criticality accident Death in 38 hours
July 24, 1964 Robert Peabody ~100 Gy Robert Peabody criticality accident Death in 49 hours
April 26, 1986 Aleksandr Akimov 15 Gy Chernobyl disaster Death in 14 days
September 30, 1999 Hisashi Ouchi 17 Sv Tokaimura nuclear accident Death in 83 days
December 2, 2001 Patient "1-DN" 3.6 Gy Lia radiological accident Death in 893 days

Other animals

Thousands of scientific experiments have been performed to study ARS in animals. There is a simple guide for predicting survival and death in mammals, including humans, following the acute effects of inhaling radioactive particles.

Elliptical galaxy

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Elliptical_galaxy
The giant elliptical galaxy ESO 325-G004

An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the four main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies. Elliptical (E) galaxies are, together with lenticular galaxies (S0) with their large-scale disks, and ES galaxies with their intermediate scale disks, a subset of the "early-type" galaxy population.

Most elliptical galaxies are composed of older, low-mass stars, with a sparse interstellar medium, and they tend to be surrounded by large numbers of globular clusters. Star formation activity in elliptical galaxies is typically minimal; they may, however, undergo brief periods of star formation when merging with other galaxies. Elliptical galaxies are believed to make up approximately 10–15% of galaxies in the Virgo Supercluster, and they are not the dominant type of galaxy in the universe overall. They are preferentially found close to the centers of galaxy clusters.

Elliptical galaxies range in size from dwarf ellipticals with tens of millions of stars, to supergiants of over one hundred trillion stars that dominate their galaxy clusters. Originally, Edwin Hubble hypothesized that elliptical galaxies evolved into spiral galaxies, which was later discovered to be false, although the accretion of gas and smaller galaxies may build a disk around a pre-existing ellipsoidal structure. Stars found inside of elliptical galaxies are on average much older than stars found in spiral galaxies.

Examples

General characteristics

Elliptical galaxy IC 2006

Elliptical galaxies are characterized by several properties that make them distinct from other classes of galaxy. They are spherical or ovoid masses of stars, starved of star-making gases. Furthermore, there is very little interstellar matter (neither gas nor dust), which results in low rates of star formation, few open star clusters, and few young stars; rather elliptical galaxies are dominated by old stellar populations, giving them red colors. Large elliptical galaxies typically have an extensive system of globular clusters. They generally have two distinct populations of globular clusters: one that is redder and metal-rich, and another that is bluer and metal-poor.

The dynamical properties of elliptical galaxies and the bulges of disk galaxies are similar, suggesting that they may be formed by the same physical processes, although this remains controversial. The luminosity profiles of both elliptical galaxies and bulges are well fit by Sersic's law, and a range of scaling relations between the elliptical galaxies' structural parameters unify the population.

Every massive elliptical galaxy contains a supermassive black hole at its center. Observations of 46 elliptical galaxies, 20 classical bulges, and 22 pseudobulges show that each contain a black hole at the center. The mass of the black hole is tightly correlated with the mass of the galaxy, evidenced through correlations such as the M–sigma relation which relates the velocity dispersion of the surrounding stars to the mass of the black hole at the center.

Elliptical galaxies are preferentially found in galaxy clusters and in compact groups of galaxies.

Unlike flat spiral galaxies with organization and structure, elliptical galaxies are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.

Sizes and shapes

Hercules A, a supergiant elliptical galaxy and also a radio galaxy. The radio lobes shown here in pink are over a million light-years across.

The largest galaxies are supergiant ellipticals, or type-cD galaxies. Elliptical galaxies vary greatly in both size and mass with diameters ranging from 3,000 light years to more than 700,000 light years, and masses from 105 to nearly 1013 solar masses. This range is much broader for this galaxy type than for any other. The smallest, the dwarf elliptical galaxies, may be no larger than a typical globular cluster, but contain a considerable amount of dark matter not present in clusters. Most of these small galaxies may not be related to other ellipticals.

The brilliant central object is the supergiant elliptical galaxy SDSS J142347.87+240442.4, the dominant member of the galaxy cluster MACS J1423.8+2404. It has a diameter of 380,000 light-years. Note the gravitational lensing.

The Hubble classification of elliptical galaxies contains an integer that describes how elongated the galaxy image is. The classification is determined by the ratio of the major (a) to the minor (b) axes of the galaxy's isophotes:

Thus for a spherical galaxy with a equal to b, the number is 0, and the Hubble type is E0. While the limit in the literature is about E7, it has been known since 1966 that the E4 to E7 galaxies are misclassified lenticular galaxies with disks inclined at different angles to our line of sight. This has been confirmed through spectral observations revealing the rotation of their stellar disks. Hubble recognized that his shape classification depends both on the intrinsic shape of the galaxy, as well as the angle with which the galaxy is observed. Hence, some galaxies with Hubble type E0 are actually elongated.

It is sometimes said that there are two physical types of ellipticals: the giant ellipticals with slightly "boxy"-shaped isophotes, whose shapes result from random motion which is greater in some directions than in others (anisotropic random motion); and the "disky" normal and dwarf ellipticals, which contain disks. This is, however, an abuse of the nomenclature, as there are two types of early-type galaxy, those with disks and those without. Given the existence of ES galaxies with intermediate-scale disks, it is reasonable to expect that there is a continuity from E to ES, and onto the S0 galaxies with their large-scale stellar disks that dominate the light at large radii.

Dwarf spheroidal galaxies appear to be a distinct class: their properties are more similar to those of irregulars and late spiral-type galaxies.

At the large end of the elliptical spectrum, there is further division, beyond Hubble's classification. Beyond gE giant ellipticals, lies D-galaxies and cD-galaxies. These are similar to their smaller brethren, but more diffuse, with large haloes that may as much belong to the galaxy cluster within which they reside than the centrally-located giant galaxy.

NGC 3597 is the product of a collision between two galaxies. It is evolving into a giant elliptical galaxy.

Star formation

In recent years, evidence has shown that a reasonable proportion (~25%) of early-type (E, ES and S0) galaxies have residual gas reservoirs and low level star-formation.

Herschel Space Observatory researchers have speculated that the central black holes in elliptical galaxies keep the gas from cooling enough for star formation.

Open government

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Open_gover...