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Sunday, August 28, 2022

Criticism of Microsoft

From Wikipedia, the free encyclopedia

Criticism of Microsoft has followed various aspects of its products and business practices. Issues with ease of use, robustness, and security of the company's software are common targets for critics. In the 2000s, a number of malware mishaps targeted security flaws in Windows and other products. Microsoft was also accused of locking vendors and consumers in to their products, and of not following or complying with existing standards in its software. Total cost of ownership comparisons between Linux and Microsoft Windows are a continuous point of debate.

The company has been the subject of numerous lawsuits, brought by several governments and by other companies, for unlawful monopolistic practices. In 2004, the European Union found Microsoft guilty in the Microsoft Corp. v. Commission case, and it received an 899 million euro fine.

Ties to US Government departments

On September 14, 2019, Microsoft's flagship store was shut down by protestors as part of a direct action organized by Close the Camps NYC. The action was in response to Microsoft's $19.4 million contract with U.S. Immigration and Customs Enforcement (ICE). Microsoft's relationship with the immigration enforcement agency was revealed by executive Tom Keane, through a company blog post that describes ICE's use of the company's high-security cloud storage product Azure Government. He went on to say the company is "proud to support" the work of ICE. Microsoft has stated it "is not working with the U.S. government on any projects related to separating children from their families at the border."

In February 2019, some of Microsoft employees protested the company's war profiteering from a $480 million contract to develop augmented reality headsets for the United States Army.

Vendor lock-in

From its inception, Microsoft defined itself as a platform company and understood the importance of attracting third-party programmers. It did so by providing development tools, training, access to proprietary APIs in early versions, and partner programs. Although the resulting ubiquity of Microsoft software allows a user to benefit from network effects, critics and even Microsoft itself decry what they consider to be an "embrace, extend and extinguish" strategy of adding proprietary features to open standards or their software implementations, thereby using its market dominance to gain unofficial ownership of standards "extended" in this way.

Microsoft software is also presented as a "safe" choice for IT managers purchasing software systems. In an internal memo for senior management Microsoft's head of C++ development, Aaron Contorer, stated:

The Windows API is so broad, so deep, and so functional that most independent software vendors would be crazy not to use it. And it is so deeply embedded in the source code of many Windows apps that there is a huge switching cost to using a different operating system instead... It is this switching cost that has given the customers the patience to stick with Windows through all our mistakes, our buggy drivers, our high TCO (total cost of ownership), our lack of a sexy vision at times, and many other difficulties [...] Customers constantly evaluate other desktop platforms, [but] it would be so much work to move over that they hope we just improve Windows rather than force them to move. In short, without this exclusive franchise called the Windows API, we would have been dead a long time ago.

More recently, Microsoft had their OOXML specification approved by the ISO standards body in a manner consistent with previous attempts to control standards.

With the release of Windows 8, Microsoft began requiring OEM devices to ship with UEFI system firmware, configured by default to only allow the execution of operating system binaries digitally signed by Microsoft (UEFI secure boot). Concerns were raised that this requirement would hinder the use of alternate operating systems such as Linux. In a post discussing secure boot on the Building Windows 8 blog, Microsoft developer Tony Mangefeste indicated that vendors would provide means to customize secure boot, stating that "At the end of the day, the customer is in control of their PC. Microsoft's philosophy is to provide customers with the best experience first, and allow them to make decisions themselves." As such, vendors were required to provide means for users to re-configure or disable secure boot (although devices running Windows RT, a variation of Windows 8 for ARM architecture, have locked firmware where this cannot be disabled). No mandate is made regarding the installation of third-party certificates that would enable running alternative programs.

Copyright enforcement

When Microsoft discovered that its first product, Altair BASIC, was subject to widespread unauthorized copying, Microsoft founder Bill Gates wrote an Open Letter to Hobbyists that openly accused many hobbyists of stealing software. Gates' letter provoked many responses, with some hobbyists objecting to the broad accusation, and others supporting the principle of compensation. This disagreement over whether software should be proprietary continues into the present day under the banner of the free software movement, with Microsoft characterizing free software released under the terms of the GPL as being "potentially viral" and the GNU General Public License itself as a "viral license" which "infects" proprietary software and forces its developer to have to release proprietary source to the public.

The Halloween documents, internal Microsoft memos which were leaked to the open source community beginning in 1998, indicate that some Microsoft employees perceive "open source" software — in particular, Linux — as a growing long-term threat to Microsoft's position in the software industry. The Halloween documents acknowledged that parts of Linux are superior to the versions of Microsoft Windows available at the time, and outlined a strategy of "de-commoditize[ing] protocols & applications." Microsoft stated in its 2006 Annual Report that it was a defendant in at least 35 patent infringement lawsuits. The company's litigation expenses for April 2004 through March 2007 exceed $4.3 billion: over $4 billion in payouts, plus $300 million in legal fees.

Another concern of critics is that Microsoft may be using the distribution of shared source software to harvest names of developers who have been exposed to Microsoft code, as some believe that these developers could someday be the target of lawsuits if they were ever to participate in the development of competing products. This issue is addressed in published papers from several organizations including the American Bar Association and the Open Source Initiative.

Starting in the 1990s, Microsoft was accused of maintaining "hidden" or "secret" APIs: interfaces to its operating system software that it deliberately keeps undocumented to gain a competitive advantage in its application software products. Microsoft employees have consistently denied this; they claim that application developers inside and outside Microsoft routinely reverse-engineered DOS and 16-bit versions of Windows without any inside help, creating legacy support problems that far exceeded any alleged benefit to Microsoft. In response to court orders, Microsoft has published interfaces between components of its operating system software, including components like Internet Explorer, Active Directory, and Windows Media that sell as part of Windows but compete with application software.

On October 10, 2018, Microsoft joined the Open Invention Network community despite holding more than 60,000 patents.

Mono patent concerns

On July 6, 2009, Microsoft announced that it was placing their ECMA 334 and ECMA 335 specifications under their Community Promise pledging that they would not assert their patents against anyone implementing, distributing, or using alternative implementations of .NET. Mono's implementation of those components of the .NET stack not submitted to the ECMA for standardization has been the source of patent violation concerns for much of the life of the project. In particular, discussion has taken place about whether Microsoft could destroy the Mono project through patent suits.

The base technologies submitted to the ECMA, and therefore also the Unix/GNOME-specific parts, are claimed to be safe due to Microsoft's explicitly placing both ECMA 334 (C#) and ECMA 335 (CLI) standards under the Microsoft Community Promise. The concerns primarily relate to technologies developed by Microsoft on top of the .NET Framework, such as ASP.NET, ADO.NET and Windows Forms (see non-standardized namespaces), i.e. parts composing Mono's Windows compatibility stack. These technologies are today not fully implemented in Mono and not required for developing Mono-applications, they are simply there for developers and users who need full compatibility with the Windows system.

In June 2009 the Ubuntu Technical Board stated that it saw "no reason to exclude Mono or applications based upon it from the archive, or from the default installation set."

The Free Software Foundation's Richard Stallman has stated on June 2, 2009, that "[...]we should discourage people from writing programs in C#. Therefore, we should not include C# implementations in the default installation of GNU/Linux distributions or in their principal ways of installing GNOME". On July 1, 2009, Brett Smith (also from the FSF) stated that "Microsoft's patents are much more dangerous: it's the only major software company that has declared itself the enemy of GNU/Linux and stated its intention to attack our community with patents.", "C# represents a unique threat to us" and "The Community Promise does nothing to change any of this".

Fedora Project Leader Paul Frields has stated, "We do have some serious concerns about Mono and we'll continue to look at it with our legal counsel to see what if any steps are needed on our part", yet "We haven't come to a legal conclusion that is pat enough for us to make the decision to take mono out".

In November 2011 at an Ubuntu Developer Summit, developers voted to have the Mono-based Banshee media player removed from Ubuntu's default installation beginning on Ubuntu 12.04; although reported reasonings included performance issues on ARM architecture, blocking issues on its GTK+ 3 version, and it being, in their opinion, "not well maintained", speculation also surfaced that the decision was also influenced by a desire to remove Mono from the base distribution, as the remaining programs dependent on Mono, gbrainy and Tomboy, were also to be removed. Mono developer Joseph Michael Shields defended the performance of Banshee on ARM, and also the claims that Banshee was not well-maintained as being a "directed personal insult" to one of its major contributors.

Ignoring unauthorized copying

Microsoft ignored unauthorized copying of its own software for their benefit on the long term. While talking about users in China who don't pay for the software they use in 2006, to an audience at the University of Washington, Bill Gates said "And as long as they're going to steal it, we want them to steal ours. They'll get sort of addicted, and then we'll somehow figure out how to collect sometime in the next decade."

The practice allowed Microsoft to gain some dominance over the Chinese market and only then taking measures against unauthorized copies. In 2008, by means of the Windows update mechanism, a verification program called "Windows Genuine Advantage" (WGA) was downloaded and installed. When WGA detects that the copy of Windows is not genuine, it periodically turns the user's screen black. This behavior angered users and generated complaints in China with a lawyer stating that "Microsoft uses its monopoly to bundle its updates with the validation programs and forces its users to verify the genuineness of their software".

Licensing agreements

A common complaint comes from those who want to purchase a computer that usually comes preinstalled with Windows without a copy of Windows pre-installed and without paying extra for the license either so that another operating system can be used or because a license was already acquired elsewhere, such as through the MSDN Academic Alliance program. Microsoft encourages original equipment manufacturers (OEMs) to supply computers with Windows pre-installed by presenting their dominance in computer sales and arguing that consumers benefit by not having to install an operating system. Because the price of the license varies depending on discounts given to the OEM and because there is no similar computer that the OEM offers without Windows, there is no immediate way to find the size of the refund. In 2009, Microsoft stated that it has always charged OEMs about $50 for a Windows license on a $1,000 computer.

While it is possible to obtain a computer with no or free operating systems, virtually all large computer vendors continue to bundle Microsoft Windows with the majority of the personal computers in their ranges. The claimed increase in the price of a computer resulting from the inclusion of a Windows license has been called the "Windows tax" or "Microsoft tax" by opposing computer users. The Findings of Fact in the United States Microsoft antitrust case of 1998 established that "One of the ways Microsoft combats piracy is by advising OEMs that they will be charged a higher price for Windows unless they drastically limit the number of PCs that they sell without an operating system pre-installed. In 1998, all major OEMs agreed to this restriction." Microsoft also once assessed license fees based on the number of computers an OEM sold, regardless of whether a Windows license was included; Microsoft was forced to end this practice due to a consent decree. In 2010, Microsoft stated that its agreements with OEMs to distribute Windows are nonexclusive, and OEMs are free to distribute computers with a different operating system or without any operating system.

Microsoft does not provide refunds for Windows licenses sold through an OEM, including licenses that come with the purchase of a computer or are pre-installed on a computer.

According to Microsoft's End User License Agreement for Windows 7 the ability to receive a refund for the operating system is determined by the hardware manufacturer:

By using the software, you accept these terms. If you do not accept them, do not use the software. Instead, contact the manufacturer or installer to determine its return policy. You must comply with that policy, which might limit your rights or require you to return the entire system on which the software is installed.

— Microsoft Software License Terms: Windows 7 Professional

Acer Inc. has a policy of requiring the customer to return items at their own expense, and the balance received by the customer can be as low as €30. In other cases, vendors have asked that customers requesting refunds sign non-disclosure agreements. Older versions of Microsoft Windows had different license terms with respect to the availability of a refund for Windows:

By using the software, you accept these terms. If you do not accept them, do not use the software. Instead, contact the manufacturer or installer to determine their return policy for a refund or credit.

— Microsoft software license terms for Windows Vista Home Basic, Home Premium and Ultimate versions

Based on the updated language, vendors refused to issue partial refunds for Windows licenses, requiring that the computer be returned altogether. In some countries, this practice has been ruled a violation of consumer protection law.

Additionally, the EULA for Windows Vista was criticized for being too restrictive.

Litigation

Microsoft's market dominance and business practices have attracted widespread resentment, which is not necessarily restricted to the company's competitors. In a 2003 publication, Dan Geer argued the prevalence of Microsoft products has resulted in a monoculture which is dangerously easy for viruses to exploit.

Labor practices

Microsoft has been criticized for the use of permatemp employees (employees employed for years as "temporary," and therefore without medical benefits), use of forced retention tactics, where departing employees would be sued to prevent departure, as well as more traditional cost-saving measures, ranging from cutting medical benefits to not providing towels in company locker rooms.

Historically, Microsoft has also been accused of overworking employees, in many cases, leading to burnout within just a few years of joining the company. The company is often referred to as a "Velvet Sweatshop", a term which originated in a 1989 Seattle Times article, and later became used to describe the company by some of Microsoft's own employees. This characterization is derived from the perception that Microsoft provides nearly everything for its employees in a convenient place, but in turn overworks them to a point where it would be bad for their (possibly long-term) health. For example, the kitchenettes have free beverages and many buildings include exercise rooms and showers. However, the company has been accused of attempting to keep employees at the company for unreasonably long hours and working them too much. This is detailed in several books about Microsoft, including Hard Drive: Bill Gates and the Making of the Microsoft Empire.

A US state lawsuit was brought against Microsoft in 1992 representing 8,558 current and former employees that had been classified as "temporary" and "freelance", and became known as Vizcaino v. Microsoft. In 1993, the suit became a US Federal Class Action in the United States District Court Western District Of Washington at Seattle as No. C93-178C. The Final Settlement came in 2005. The case was decided on the (IRS-defined) basis that such "permatemps" had their jobs defined by Microsoft, worked alongside regular employees doing the same work, and worked for long terms. After a series of court setbacks including three reversals on appeal, Microsoft settled the suit for US$97 million.

A side effect of the "permatemp" lawsuit is that now contract employees are prevented from participating in team morale events and other activities that could be construed as making them "employees". They are also limited to 18-month contracts and must leave after that time for 6 months before returning under contract.

Microsoft is the largest American corporate user of H-1B guest worker visas and has joined other large technology companies like Google in recently lobbying for looser H-1B visa restrictions.

Jesse Jackson believes Microsoft should hire more minorities and women. Jackson has urged other companies to diversify their workforce. He believes that Microsoft made some progress when it appointed two women to its board of directors in 2015.

Advertising and public relations

Critics have alleged that Microsoft has used funding to drum up support from think tanks and trade organizations such as the Alexis de Tocqueville Institution (AdTI), the Independent Institute, and Americans for Technology Leadership (ATL). During the antitrust case United States v. Microsoft, ATL sent a poll to 19 state attorneys general purporting to show that "the public believes state AGs should devote their energy to causes other than Microsoft". Also during the case the Independent Institute ran full-page advertisements in The New York Times and The Washington Post defending Microsoft, which was later revealed to have funded the ad campaign. The institute published Winners, Losers, and Microsoft: Competition and Antitrust in High Technology shortly thereafter.

In June 2002, the AdTI published a report, quickly pulled under the argument that it was a draft version, which contained criticism of the copyleft model and the GNU General Public License. A May 2002 press release for the report stated that it would contain arguments suggesting that governments could be threatened by hackers and terrorists (who could study potential vulnerabilities due to source availability) if it used open source software. However, the draft contained no references to these topics. Open Source Initiative (OSI) founder Bruce Perens felt that the report had "Microsoft's paws all over [it]". Microsoft argued that its funding was for AdTI's operations as a whole, and not relevant to any specific research by the organization.

"Champagne", a 2002 British television advert for the Xbox, received 136 complaints from viewers to the Independent Television Commission (ITC) over its content. The advert featured a newborn baby being launched out of its mother—aging as it flies through the air, and crashing into a gravestone. It contained the tagline "Life is short, play more." The advert was banned from television by the ITC, who considered it to be "offensive, shocking and in bad taste", noting complaints citing the advert's themes of death and the "traumatic experience" the person was facing in the ad.

In August 2004, the Advertising Standards Authority (ASA) ordered Microsoft to pull ads in Britain that claimed that the total cost of ownership of Linux servers was ten times that of Windows Server 2003. The comparison included the cost of hardware, and put Linux at a disadvantage by installing it on more expensive but poorer-performing hardware compared to that used for Windows.

On January 22, 2007, Rick Jelliffe made a claim on his blog that a Microsoft employee offered to pay him to make corrections in English Wikipedia articles concerning Office Open XML. Microsoft spokesperson Catherine Brooker expressed the belief that the article had been "heavily written" by IBM employees who supported the rival OpenDocument format, though she provided no specific evidence. Internet entrepreneur and Wikimedia Foundation founder Jimmy Wales described Microsoft's offer as unethical.

In 2009, it was found that a photo on the Polish version of Microsoft's business productivity website—which depicted three people of various races during an office meeting—had been edited to replace the head of an African-American man with that of a Caucasian, whilst also failing to edit the person's hand to match the different skin color. Microsoft apologized and quickly removed the image.

In 2011, Moneylife.in alleged that two "anonymous comments boosting their product"—one by a Nokia employee and another by a Microsoft employee—were posted on their review of Nokia Lumia 800, which was based only on the "technical specifications" and the reviewer "hadn't laid a finger on the phone". In conclusion, Charles Arthur argued "Nobody has come out of the episode looking good. Sapkale was accused of breaking his own site's privacy policy by posting the IP and email addresses of the commenters, while the commenting duo's failure to declare any interest looked, at best, like astroturfing."

In 2014 details on a partnership between Machinima.com and Microsoft came to light regarding a marketing campaign for Xbox One. Machinima would offer some of its users $3 per thousand views if the user showed 30 seconds of an Xbox One game and mentioned the system by name. Controversy arose when it was reported that, under the terms of the promotion, participants were not allowed to disclose that they were being paid for said endorsements, which Ars Technica said conflicted with FTC regulations requiring recipients to fully disclose when such actions occur. Machinima stated that the confidentiality clause only applied to the terms of the agreement, and not to the existence of the agreement, and Microsoft ended the promotion and directed Machinima to add disclosures to the videos involved. In September 2015, Machinima settled with the FTC over charges that the ad campaign failed to comply with FTC endorsement guidelines; the FTC decided not to take action against Microsoft since it already has "policies and procedures designed to prevent such lapses".

Tax avoidance

As reported by several news outlets, an Irish subsidiary of Microsoft based in the Republic of Ireland declared £220 bn in profits but paid no corporation tax for the year 2020. This is due to the company being tax resident in Bermuda as mentioned in the accounts for 'Microsoft Round Island One', a subsidiary that collects licence fees from the use of Microsoft software worldwide. Dame Margaret Hodge, a Labour MP in the UK said, "It is unsurprising – yet still shocking – that massively wealthy global corporations openly, unashamedly and blatantly refuse to pay tax on the profits they make in the countries where they undertake business".

In 2020, ProPublica reported that the company had diverted more than $39 billion in U.S. profits to Puerto Rico using a mechanism structured to make it seem as if the company was unprofitable on paper. As a result, the company paid a tax rate on those profits of "nearly 0%." When the Internal Revenue Service audited these transactions, ProPublica reported that Microsoft aggressively fought back, including successfully lobbying Congress to change the law to make it harder for the agency to conduct audits of large corporations.

Blacklisting of journalists

John C. Dvorak said that in the 1980s, Microsoft classified journalists as "Okay", "Sketchy", or "Needs work" and targeted "Needs work" journalists in an attempt to have them terminated. Dvorak said that he was denied information about Windows because he was on a blacklist. Mary Jo Foley stated that she was denied interviews with Microsoft personnel for several years following the publication of a story based on a memo describing the number of bugs in Windows 2000 at release.

Censorship in China

Microsoft (along with Google, Yahoo, Cisco, AOL, Skype, and other companies) has cooperated with the Chinese government in implementing a system of Internet censorship. Human rights advocates such as Human Rights Watch and media groups such as Reporters Without Borders criticized the companies, noting for example that it is "ironic that companies whose existence depends on freedom of information and expression have taken on the role of censor."

Bing censorship of the 1989 Tiananmen Square massacre

On June 4, 2021, the 32nd anniversary of the 1989 Tiananmen Square massacre, searches for the Tank Man image and videos were censored by Microsoft Bing search engine worldwide. Hours after Microsoft acknowledged the issue, the search returned only pictures of tanks elsewhere in the world. Search engines that license results from Microsoft such as DuckDuckGo and Yahoo faced similar issues. Microsoft said the issue was "due to an accidental human error."

The director of Human Rights Watch, Kenneth Roth, said he found the idea it was an inadvertent error "hard to believe". David Greene, Civil Liberties Director at Electronic Frontier Foundation, said that content moderation was impossible to do perfectly and "egregious mistakes are made all the time", but he further elaborated that "At worst, this was purposeful suppression at the request of a powerful state."

Privacy issues

Collaboration with the NSA on internet surveillance

Microsoft was the first company to participate in the PRISM surveillance program, according to leaked NSA documents obtained by The Guardian and The Washington Post in June 2013, and acknowledged by government officials following the leak. The program authorizes the government to secretly access data of non-US citizens hosted by American companies without a warrant. Microsoft has denied participation in such a program.

In July 2013, The Guardian elaborated that leaked documents show that:

  • Microsoft helped the NSA to circumvent its encryption to intercept web chats on Outlook.com and gave it unencrypted access to Outlook.com and Hotmail email.
  • Microsoft provided the NSA with access to users' data on its cloud storage service OneDrive (formerly SkyDrive).
  • After Microsoft bought Skype, the NSA tripled the number of Skype video calls being collected through PRISM.

In a statement, Microsoft said that they "provide customer data only in response to legal processes."

Telemetry and data collection

Windows 10 was criticized on-launch for having default settings that send various information regarding user behaviors to Microsoft and its "trusted partners", such as data regarding user contacts and calendar events, location data and history, "telemetry" (diagnostics data); this could not be fully disabled on non-enterprise versions of Windows 10), an "advertising ID", as well as further data when the Cortana assistant is enabled in full.

Microsoft faced criticism from France's data protection commission and the European Union for its practices in regards to Windows 10. On subsequent iterations of the OS, Microsoft has clarified its data collection policies, and made its out-of-box experience provide clearer information on Windows privacy settings, and the effects they have on the overall user experience. Microsoft also simplified its "telemetry" options to only consist of "Basic" and "Full" modes, and reduced the amount of system information collected in "Basic" mode.

In November 2018, the Dutch government issued a report stating that telemetry implementations in Office 365 violated the EU General Data Protection Regulation (GDPR). In July 2019 the company tasked with investigating the privacy risks reported that Microsoft had adequately addressed these issues in Office 365 ProPlus, while the other concerns still remained.

Robot journalism

In May 2020, Microsoft announced that a number of its MSN contract journalists would be replaced by robot journalism leading to criticism about which stories would be displayed and their quality.

Xbox Live prohibition on use of the word "gay"

Microsoft has come under some criticism for its attitude to homosexuality and Xbox Live. Users may not use the string "gay" in a gamertag (even in a non-homosexual context, for example as part of a surname), or refer to homosexuality in their profile (including self-identifying as such), as the company considers this "content of a sexual nature" or "offensive" to other users and therefore unsuitable for the service. After banning 'Teresa', a lesbian gamer who had been harassed by other users for being a homosexual, a senior Xbox Live team member, Stephen Toulouse, has clarified the policy, stating that "Expression of any sexual orientation [...] is not allowed in gamertags" but that they are "examining how we can provide it in a way that won't get misused". GLAAD weighed in on the controversy as well, supporting the steps that Microsoft has taken over the years to engage the LGBT community.

Xbox Live subscription price increase

On January 22, 2021, Microsoft announced that the pricing model for Xbox Live subscriptions would be increasing across each price tier, with a year of the service doubling from US$60 to US$120 for users. The move was met with widespread criticism from users and news media, with speculation that the change was meant to make the Xbox Game Pass subscription more enticing. In response to the backlash, on the same day that the price increase was announced, Microsoft reversed the decision to increase the price of Xbox Live.

ANS patent controversy

Asymmetric numeral systems is widely used family of method in data compression, whose author gave it to public domain - wanting to be unrestricted by the patent system, also successfully defending from patent by Google. In June 2019 Microsoft lodged a patent application called 'Features of range asymmetric number system encoding and decoding'. The USPTO issued a final rejection of the application on October 27, 2020. Yet on March 2, 2021, Microsoft gave a USPTO explanatory filing stating "The Applicant respectfully disagrees with the rejections, seeking to overturn the final rejection under the "After Final Consideration Pilot 2.0" program. The application is currently still pending, as USPTO has not confirmed if it will allow the rejection appeal to proceed.

Xinjiang region

In 2020, the Australian Strategic Policy Institute accused at least 82 major brands of being connected to forced Uyghur labor in Xinjiang. Microsoft is reported as being supplied by three Chinese factories employing Uyghur and Xinjiang workers.

Permafrost

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

Permafrost
Circum-Arctic Map of Permafrost and Ground Ice Conditions.png
Map showing extent and types of permafrost in the Northern Hemisphere
Used inInternational Permafrost Association
ClimateHigh latitudes, alpine regions 

Slope failure of permafrost soil, revealing the top of an ice wedge.

Permafrost is ground that continuously remains below 0 °C (32 °F) for two or more years, located on land or under the ocean. Most common in the Northern Hemisphere, around 15% of the Northern Hemisphere or 11% of the global surface is underlain by permafrost, including substantial areas of Alaska, Greenland, Canada and Siberia. It can also be located on mountaintops in the Southern Hemisphere and beneath ice-free areas in the Antarctic.

Permafrost does not have to be the first layer that is on the ground. It can be from an inch to several miles deep under the Earth's surface. It frequently occurs in ground ice, but it can also be present in non-porous bedrock. Permafrost is formed from ice holding various types of soil, sand, and rock in combination.

Permafrost contains large amounts of biomass and decomposed biomass that has been stored as methane and carbon dioxide, making tundra soil a carbon sink. As global warming heats the ecosystem and causes soil thawing, the permafrost carbon cycle accelerates and releases much of these soil-contained greenhouse gases into the atmosphere, creating a feedback cycle that increases climate change. Thawing of permafrost is one of the effects of climate change. The Sixth IPCC Report states that while emissions from thawing permafrost will be significant enough to lead to additional warming, they will likely not be enough to trigger a self-reinforcing feedback leading to runaway warming.

Study of permafrost

Southern limit of permafrost in Eurasia according to Karl Ernst von Baer (1843), and other authors.

In contrast to the relative dearth of reports on frozen ground in North America prior to World War II, a vast literature on basic permafrost science and the engineering aspects of permafrost was available in Russian. Some Russian authors relate permafrost research with the name Alexander von Middendorff (1815–1894). However, Russian scientists also realized, that Karl Ernst von Baer must be given the attribute "founder of scientific permafrost research". In 1843, Baer's original study “materials for the study of the perennial ground-ice” was ready to be printed. Baer's detailed study consists of 218 pages and was written in German language, as he was a Baltic German scientist. He was teaching at the University of Königsberg and became a member of the St Petersburg Academy of Sciences. This world's first permafrost textbook was conceived as a complete work and ready for printing in 1843. But it remained lost for around 150 years. However, from 1838 onwards, Baer published several individual publications on permafrost. The Russian Academy of Sciences honoured Baer with the publication of a tentative Russian translation of his study in 1942.

These facts were completely forgotten after the Second World War. Thus in 2001 the discovery of the typescript from 1843 in the library archives of the University of Giessen and its annotated publication was a scientific sensation. The full text of Baer's original work is available online (234 pages). The editor added to the facsimile reprint a preface in English, two colour permafrost maps of Eurasia and some figures of permafrost features. Baer's text is introduced with detailed comments and references on additional 66 pages written by the Estonian historian Erki Tammiksaar. The work is fascinating to read, because both Baer's observations on permafrost distribution and his periglacial morphological descriptions are largely still correct today. With his compilation and analysis of all available data on ground ice and permafrost, Baer laid the foundation for the modern permafrost terminology. Baer's southern limit of permafrost in Eurasia drawn in 1843 corresponds well with the actual southern limit on the Circum-Arctic Map of Permafrost and Ground Ice Conditions of the International Permafrost Association (edited by J. Brown et al.).

Beginning in 1942, Siemon William Muller delved into the relevant Russian literature held by the Library of Congress and the U.S. Geological Survey Library so that he was able to furnish the government an engineering field guide and a technical report about permafrost by 1943", the year in which he coined the term as a contraction of permanently frozen ground. Although originally classified (as U.S. Army. Office of the Chief of Engineers, Strategic Engineering Study, no. 62, 1943), in 1947 a revised report was released publicly, which is regarded as the first North American treatise on the subject.

Classification and extent

Red lines: Seasonal temperature extremes (dotted=average).

Permafrost is soil, rock or sediment that is frozen for more than two consecutive years. In areas not covered by ice, it exists beneath a layer of soil, rock or sediment, which freezes and thaws annually and is called the "active layer". In practice, this means that permafrost occurs at an mean annual temperature of −2 °C (28.4 °F) or below. Active layer thickness varies with the season, but is 0.3 to 4 meters thick (shallow along the Arctic coast; deep in southern Siberia and the Qinghai-Tibetan Plateau).

The extent of permafrost is displayed in terms of permafrost zones, which are defined according to the area underlain by permafrost as continuous (90%–100%), discontinuous (50%–90%), sporadic (10%–50%), and isolated patches (10% or less). These permafrost zones cover together approximately 22% of the Northern Hemisphere. Continuous permafrost zone covers slightly more than half of this area, discontinuous permafrost around 20 percent, and sporadic permafrost together with isolated patches little less than 30 percent. Because permafrost zones are not entirely underlain by permafrost, only 15% of the ice-free area of the Northern Hemisphere is actually underlain by permafrost. Most of this area is found in Siberia, northern Canada, Alaska and Greenland. Beneath the active layer annual temperature swings of permafrost become smaller with depth. The deepest depth of permafrost occurs where geothermal heat maintains a temperature above freezing. Above that bottom limit there may be permafrost with a consistent annual temperature—"isothermal permafrost".

Continuity of coverage

Permafrost typically forms in any climate where the mean annual air temperature is lower than the freezing point of water. Exceptions are found in humid boreal forests, such as in Northern Scandinavia and the North-Eastern part of European Russia west of the Urals, where snow acts as an insulating blanket. Glaciated areas may also be exceptions. Since all glaciers are warmed at their base by geothermal heat, temperate glaciers, which are near the pressure-melting point throughout, may have liquid water at the interface with the ground and are therefore free of underlying permafrost. "Fossil" cold anomalies in the Geothermal gradient in areas where deep permafrost developed during the Pleistocene persist down to several hundred metres. This is evident from temperature measurements in boreholes in North America and Europe.

Discontinuous permafrost

The below-ground temperature varies less from season to season than the air temperature, with mean annual temperatures tending to increase with depth as a result of the geothermal crustal gradient. Thus, if the mean annual air temperature is only slightly below 0 °C (32 °F), permafrost will form only in spots that are sheltered—usually with a northern or southern aspect (in north and south hemispheres respectively) —creating discontinuous permafrost. Usually, permafrost will remain discontinuous in a climate where the mean annual soil surface temperature is between −5 and 0 °C (23 and 32 °F). In the moist-wintered areas mentioned before, there may not be even discontinuous permafrost down to −2 °C (28 °F). Discontinuous permafrost is often further divided into extensive discontinuous permafrost, where permafrost covers between 50 and 90 percent of the landscape and is usually found in areas with mean annual temperatures between −2 and −4 °C (28 and 25 °F), and sporadic permafrost, where permafrost cover is less than 50 percent of the landscape and typically occurs at mean annual temperatures between 0 and −2 °C (32 and 28 °F). In soil science, the sporadic permafrost zone is abbreviated SPZ and the extensive discontinuous permafrost zone DPZ. Exceptions occur in un-glaciated Siberia and Alaska where the present depth of permafrost is a relic of climatic conditions during glacial ages where winters were up to 11 °C (20 °F) colder than those of today.

Continuous permafrost

Estimated extent of alpine permafrost by region
Locality Area
Qinghai-Tibet Plateau 1,300,000 km2 (500,000 sq mi)
Khangai-Altai Mountains 1,000,000 km2 (390,000 sq mi)
Brooks Range 263,000 km2 (102,000 sq mi)
Siberian Mountains 255,000 km2 (98,000 sq mi)
Greenland 251,000 km2 (97,000 sq mi)
Ural Mountains 125,000 km2 (48,000 sq mi)
Andes 100,000 km2 (39,000 sq mi)
Rocky Mountains (US and Canada) 100,000 km2 (39,000 sq mi)
Alps 80,000 km2 (31,000 sq mi)
Fennoscandian mountains 75,000 km2 (29,000 sq mi)
Remaining <50,000 km2 (19,000 sq mi)

At mean annual soil surface temperatures below −5 °C (23 °F) the influence of aspect can never be sufficient to thaw permafrost and a zone of continuous permafrost (abbreviated to CPZ) forms. A line of continuous permafrost in the Northern Hemisphere represents the most southern border where land is covered by continuous permafrost or glacial ice. The line of continuous permafrost varies around the world northward or southward due to regional climatic changes. In the southern hemisphere, most of the equivalent line would fall within the Southern Ocean if there were land there. Most of the Antarctic continent is overlain by glaciers, under which much of the terrain is subject to basal melting. The exposed land of Antarctica is substantially underlain with permafrost, some of which is subject to warming and thawing along the coastline.

Alpine permafrost

Alpine permafrost occurs at elevations with low enough average temperatures to sustain perennially frozen ground; much alpine permafrost is discontinuous. Estimates of the total area of alpine permafrost vary. Bockheim and Munroe combined three sources and made the tabulated estimates by region, totaling 3,560,000 km2 (1,370,000 sq mi).

Alpine permafrost in the Andes has not been mapped. Its extent has been modeled to assess the amount of water bound up in these areas. In 2009, a researcher from Alaska found permafrost at the 4,700 m (15,400 ft) level on Africa's highest peak, Mount Kilimanjaro, approximately 3° south of the equator.

Subsea permafrost

Subsea permafrost occurs beneath the seabed and exists in the continental shelves of the polar regions. These areas formed during the last ice age, when a larger portion of Earth's water was bound up in ice sheets on land and when sea levels were low. As the ice sheets melted to again become seawater, the permafrost became submerged shelves under relatively warm and salty boundary conditions, compared to surface permafrost. Therefore, subsea permafrost exists in conditions that lead to its diminishment. According to Osterkamp, subsea permafrost is a factor in the "design, construction, and operation of coastal facilities, structures founded on the seabed, artificial islands, sub-sea pipelines, and wells drilled for exploration and production." It also contains gas hydrates in places, which are a "potential abundant source of energy" but may also destabilize as subsea permafrost warms and thaws, producing large amounts of methane gas, which is a potent greenhouse gas. Scientists report with high confidence that the extent of subsea permafrost is decreasing, and 97% of permafrost under Arctic ice shelves is currently thinning.

Manifestations

Time required for permafrost to reach depth at Prudhoe Bay, Alaska
Time (yr) Permafrost depth
1 4.44 m (14.6 ft)
350 79.9 m (262 ft)
3,500 219.3 m (719 ft)
35,000 461.4 m (1,514 ft)
100,000 567.8 m (1,863 ft)
225,000 626.5 m (2,055 ft)
775,000 687.7 m (2,256 ft)

Base depth

Permafrost extends to a base depth where geothermal heat from the Earth and the mean annual temperature at the surface achieve an equilibrium temperature of 0 °C. The base depth of permafrost reaches 1,493 m (4,898 ft) in the northern Lena and Yana River basins in Siberia. The geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior. Away from tectonic plate boundaries, it is about 25–30 °C/km (124–139 °F/mi) near the surface in most of the world. It varies with the thermal conductivity of geologic material and is less for permafrost in soil than in bedrock.

Calculations indicate that the time required to form the deep permafrost underlying Prudhoe Bay, Alaska was over a half-million years. This extended over several glacial and interglacial cycles of the Pleistocene and suggests that the present climate of Prudhoe Bay is probably considerably warmer than it has been on average over that period. Such warming over the past 15,000 years is widely accepted. The table to the right shows that the first hundred metres of permafrost forms relatively quickly but that deeper levels take progressively longer.

Massive ground ice

Massive blue ground ice exposure on the north shore of Herschel Island, Yukon, Canada.

When the ice content of a permafrost exceeds 250 percent (ice to dry soil by mass) it is classified as massive ice. Massive ice bodies can range in composition, in every conceivable gradation from icy mud to pure ice. Massive icy beds have a minimum thickness of at least 2 m and a short diameter of at least 10 m. First recorded North American observations were by European scientists at Canning River, Alaska in 1919. Russian literature provides an earlier date of 1735 and 1739 during the Great North Expedition by P. Lassinius and Kh. P. Laptev, respectively. Two categories of massive ground ice are buried surface ice and intrasedimental ice (also called constitutional ice).

Buried surface ice may derive from snow, frozen lake or sea ice, aufeis (stranded river ice) and—probably the most prevalent—buried glacial ice.

Intrasedimental ice forms by in-place freezing of subterranean waters and is dominated by segregational ice which results from the crystallizational differentiation taking place during the freezing of wet sediments, accompanied by water migrating to the freezing front.

Intrasedimental or constitutional ice has been widely observed and studied across Canada and also includes intrusive and injection ice.

Additionally, ice wedges—a separate type of ground ice—produce recognizable patterned ground or tundra polygons. Ice wedges form in a pre-existing geological substrate and were first described in 1919.

Several types of massive ground ice, including ice wedges and intrasedimental ice within the cliff wall of a retrogressive thaw slump located on the southern coast of Herschel Island within an approximately 22-metre (72 ft) by 1,300-metre (4,300 ft) headwall.

Landforms

Permafrost processes manifest themselves in large-scale land forms, such as palsas and pingos and smaller-scale phenomena, such as patterned ground found in arctic, periglacial and alpine areas. In ice-rich permafrost areas, melting of ground ice initiates thermokarst landforms such as thermokarst lakes, thaw slumps, thermal-erosion gullies, and active layer detachments.

Carbon cycle in permafrost

The permafrost carbon cycle (Arctic Carbon Cycle) deals with the transfer of carbon from permafrost soils to terrestrial vegetation and microbes, to the atmosphere, back to vegetation, and finally back to permafrost soils through burial and sedimentation due to cryogenic processes. Some of this carbon is transferred to the ocean and other portions of the globe through the global carbon cycle. The cycle includes the exchange of carbon dioxide and methane between terrestrial components and the atmosphere, as well as the transfer of carbon between land and water as methane, dissolved organic carbon, dissolved inorganic carbon, particulate inorganic carbon and particulate organic carbon.

Effects of climate change

Arctic permafrost has been diminishing for decades. Globally, permafrost warmed by about 0.3 °C between 2007 and 2016, with stronger warming observed in the continuous permafrost zone relative to the discontinuous zone. The consequence is thawing soil, which may be weaker, and release of methane, which contributes to an increased rate of global warming as part of a feedback loop caused by microbial decomposition. Wetlands drying out from drainage or evaporation compromises the ability of plants and animals to survive. When permafrost continues to diminish, many climate change scenarios will be amplified. In areas where permafrost is high, the infrastructure surrounded may be damaged severely by the thawing of permafrost. It is believed that carbon storage in permafrost globally is approximately 1600 gigatons; equivalent to twice the atmospheric pool.

Historical changes

Recently thawed Arctic permafrost and coastal erosion on the Beaufort Sea, Arctic Ocean, near Point Lonely, Alaska in 2013.

At the Last Glacial Maximum, continuous permafrost covered a much greater area than it does today, covering all of ice-free Europe south to about Szeged (southeastern Hungary) and the Sea of Azov (then dry land) and East Asia south to present-day Changchun and Abashiri. In North America, only an extremely narrow belt of permafrost existed south of the ice sheet at about the latitude of New Jersey through southern Iowa and northern Missouri, but permafrost was more extensive in the drier western regions where it extended to the southern border of Idaho and Oregon. In the southern hemisphere, there is some evidence for former permafrost from this period in central Otago and Argentine Patagonia, but was probably discontinuous, and is related to the tundra. Alpine permafrost also occurred in the Drakensberg during glacial maxima above about 3,000 metres (9,840 ft).

Thaw

By definition, permafrost is ground that remains frozen for two or more years. The ground can consist of many substrate materials, including bedrock, sediment, organic matter, water or ice. Frozen ground is that which is below the freezing point of water, whether or not water is present in the substrate. Ground ice is not always present, as may be the case with nonporous bedrock, but it frequently occurs and may be present in amounts exceeding the potential hydraulic saturation of the thawed substrate.

During thaw, the ice content of the soil melts and, as the water drains or evaporates, causes the soil structure to weaken and sometimes become viscous until it regains strength with decreasing moisture content. Thawing can also influence the rate of change of soil gases with the atmosphere. One visible sign of permafrost degradation is the random displacement of trees from their vertical orientation in permafrost areas.

Effect on slope stability

Over the past century, an increasing number of alpine rock slope failure events in mountain ranges around the world have been recorded. It is expected that the high number of structural failures is due to permafrost thawing, which is thought to be linked to climate change. Permafrost thawing is thought to have contributed to the 1987 Val Pola landslide that killed 22 people in the Italian Alps. In mountain ranges, much of the structural stability can be attributed to glaciers and permafrost. As climate warms, permafrost thaws, which results in a less stable mountain structure, and ultimately more slope failures.

McSaveney reported massive rock and ice falls (up to 11.8 million m3), earthquakes (up to 3.9 Richter), floods (up to 7.8 million m3 water), and rapid rock-ice flow to long distances (up to 7.5 km at 60 m/s) caused by “instability of slopes” in high mountain permafrost. Instability of slopes in permafrost at elevated temperatures near freezing point in warming permafrost is related to effective stress and buildup of pore-water pressure in these soils. Kia and his co-inventors invented a new filter-less rigid piezometer (FRP) for measuring pore-water pressure in partially frozen soils such as warming permafrost soils. They extended the use of effective stress concept to partially frozen soils for use in slope stability analysis of warming permafrost slopes. The use of effective stress concept has many advantages such as ability to extend the concepts of "Critical State Soil Mechanics" into frozen ground engineering.

In high mountains rockfalls may be caused by thawing of rock masses with permafrost.

Frozen debris lobes

According to the University of Alaska Fairbanks, frozen debris lobes (FDLs) are "slow-moving landslides composed of soil, rocks, trees, and ice that occur in permafrost. As of December 2021, there were 43 frozen debris lobes identified in the southern Brooks Range along the Trans Alaska Pipeline System (TAPS) corridor and the main highway linking Interior Alaska and the Alaska North Slope—the Dalton Highway. By 2012, some FDLs measured over 100 m (110 yd) in width, 20 m (22 yd) in height, and 1,000 m (1,100 yd) in length. Based on measurements of a frozen debris-lobe southern Brooks Range in Alaska taken from 2008 to 2010, researchers found accelerated movement as ice in deeper layers of soil melted with rising temperatures. Ice within the soil melts, causing loss of soil strength, accelerated movement, and potential debris flows. They raised concerns of a future potential hazard of one debris lobe to both the Trans Alaska Pipeline System and the main highway linking Interior Alaska and the North Slope—Dalton Highway.

Ecological consequences

In the northern circumpolar region, permafrost contains 1700 billion tons of organic material equaling almost half of all organic material in all soils. This pool was built up over thousands of years and is only slowly degraded under the cold conditions in the Arctic. The amount of carbon sequestered in permafrost is four times the carbon that has been released to the atmosphere due to human activities in modern time. One manifestation of this is yedoma, which is an organic-rich (about 2% carbon by mass) Pleistocene-age loess permafrost with ice content of 50–90% by volume.

Formation of permafrost has significant consequences for ecological systems, primarily due to constraints imposed upon rooting zones, but also due to limitations on den and burrow geometries for fauna requiring subsurface homes. Secondary effects impact species dependent on plants and animals whose habitat is constrained by the permafrost. One of the most widespread examples is the dominance of black spruce in extensive permafrost areas, since this species can tolerate rooting pattern constrained to the near surface.

The number of bacteria in permafrost soil varies widely, typically from 1 to 1000 million per gram of soil. Most of these bacteria and fungi in permafrost soil cannot be cultured in the laboratory, but the identity of the microorganisms can be revealed by DNA-based techniques.

The Arctic region is one of the many natural sources of the greenhouse gases methane and carbon dioxide. Global warming accelerates its release due to release of methane from both existing stores and methanogenesis in rotting biomass. Large quantities of methane are stored in the Arctic in natural gas deposits, in permafrost, and as submarine clathrates. Permafrost and clathrates degrade on warming, and thus, large releases of methane from these sources may arise as a result of global warming. Other sources of methane include submarine taliks, river transport, ice complex retreat, submarine permafrost, and decaying gas hydrate deposits. Preliminary computer analyses suggest that permafrost could produce carbon equal to 15 percent or so of today's emissions from human activities.

A hypothesis promoted by Sergey Zimov is that the reduction of herds of large herbivores has increased the ratio of energy emission and energy absorption tundra (energy balance) in a manner that increases the tendency for net thawing of permafrost. He is testing this hypothesis in an experiment at Pleistocene Park, a nature reserve in northeastern Siberia.

Warming temperatures in the Arctic allow beavers to extend their habitat further north, where their dams impair boat travel, impact access to food, affect water quality, and endanger downstream fish populations. Pools formed by the dams store heat, thus changing local hydrology and causing localized thawing of permafrost that in turn contributes to global warming.

Global warming has been increasing permafrost slope disturbances and sediment supplies to fluvial systems, resulting in exceptional increases in river sediment. 

Predicted rate of change in the Arctic

According to the IPCC Sixth Assessment Report, there is high confidence that global warming over the last few decades has led to widespread increases in permafrost temperature. Observed warming was up to 3 °C in parts of Northern Alaska (early 1980s to mid-2000s) and up to 2 °C in parts of the Russian European North (1970-2020), and active layer thickness has increased in the European and Russian Arctic across the 21st century and at high elevation areas in Europe and Asia since the 1990s. In Yukon, the zone of continuous permafrost might have moved 100 kilometres (62 mi) poleward since 1899, but accurate records only go back 30 years. It is thought that permafrost thawing could exacerbate global warming by releasing methane and other hydrocarbons, which are powerful greenhouse gases. It also could encourage erosion because permafrost lends stability to barren Arctic slopes.

Based on high agreement across model projections, fundamental process understanding, and paleoclimate evidence, it is virtually certain that permafrost extent and volume will shrink as global climate warms. Arctic temperatures are expected to increase at roughly twice the global rate. The volume of permafrost in the upper 3 m of ground is expected to decrease by about 25% per 1 °C of warming. Estimates vary on how many tons of greenhouse gases are emitted from thawed permafrost soils. The Sixth IPCC Report estimates that carbon dioxide and methane released from permafrost could amount to the equivalent of 14-175 billion tonnes of carbon dioxide per 1oC of warming. For comparison, by 2019 the anthropogenic emission of all carbon dioxide into the atmosphere stood around 40 billion tonnes. Release of greenhouse gases from thawed permafrost to the atmosphere increases global warming.

Preservation of organisms in permafrost

Microbes

Scientists predict that up to 1021 microbes, including fungi and bacteria in addition to viruses, will be released from melting ice per year. Often, these microbes will be released directly into the ocean. Due to the migratory nature of many species of fish and birds, it is possible that these microbes have a high transmission rate.

Permafrost in eastern Switzerland was analyzed by researchers in 2016 at an alpine permafrost site called “Muot-da-Barba-Peider”.This site had a diverse microbial community with various bacteria and eukaryotic groups present. Prominent bacteria groups included phylum Acidobacteriota, Actinomycetota, AD3, Bacteroidota, Chloroflexota, Gemmatimonadota, OD1, Nitrospirota, Planctomycetota, Pseudomonadota, and Verrucomicrobiota. Prominent eukaryotic fungi included Ascomycota, Basidiomycota, and Zygomycota. In the present species, scientists observed a variety of adaptations for sub-zero conditions, including reduced and anaerobic metabolic processes.

A 2016 outbreak of anthrax in the Yamal Peninsula is believed to be due to thawing permafrost. Also present in Siberian permafrost are two species of virus: Pithovirus sibericum and Mollivirus sibericum. Both of these are approximately 30,000 years old and considered giant viruses due to the fact that they are larger in size than most bacteria and have genomes larger than other viruses. Both viruses are still infective, as seen by their ability to infect Acanthamoeba, a genus of amoebas.

Freezing at low temperatures has been shown to preserve the infectivity of viruses. Caliciviruses, influenza A, and enteroviruses (ex. Polioviruses, echoviruses, Coxsackie viruses) have all been preserved in ice and/or permafrost. Scientists have determined three characteristics necessary for a virus to successfully preserve in ice: high abundance, ability to transport in ice, and ability to resume disease cycles upon being released from ice. A direct infection from permafrost or ice to humans has not been demonstrated; such viruses are typically spread through other organisms or abiotic mechanisms.

A study of late Pleistocene Siberian permafrost samples from Kolyma Lowland (an east siberian lowland) used DNA isolation and gene cloning (specifically 16S rRNA genes) to determine which phyla these microorganisms belonged to. This technique allowed a comparison of known microorganisms to their newly discovered samples and revealed eight phylotypes, which belonged to the phyla Actinomycetota and Pseudomonadota.

Plants

In 2012, Russian researchers proved that permafrost can serve as a natural repository for ancient life forms by reviving of Silene stenophylla from 30,000 year old tissue found in an Ice Age squirrel burrow in the Siberian permafrost. This is the oldest plant tissue ever revived. The plant was fertile, producing white flowers and viable seeds. The study demonstrated that tissue can survive ice preservation for tens of thousands of years.

Extraterrestrial permafrost

Other issues

The International Permafrost Association (IPA) is an integrator of issues regarding permafrost. It convenes International Permafrost Conferences, undertakes special projects such as preparing databases, maps, bibliographies, and glossaries, and coordinates international field programmes and networks. Among other issues addressed by the IPA are: Problems for construction on permafrost owing to the change of soil properties of the ground on which structures are placed and the biological processes in permafrost, e.g. the preservation of organisms frozen in situ.

Construction on permafrost

Yakutsk is one of two large cities in the world built in areas of continuous permafrost—that is, where the frozen soil forms an unbroken, below-zero sheet. The other is Norilsk, in Krasnoyarsk Krai, Russia.

Building on permafrost is difficult because the heat of the building (or pipeline) can warm the permafrost and destabilize the structure. Warming can result in thawing of the soil and its consequent weakening of support for a structure as the ice content turns to water; alternatively, where structures are built on piles, warming can cause movement through creep because of the change of friction on the piles even as the soil remains frozen.

Three common solutions include: using foundations on wood piles, a technique pioneered by Soviet engineer Mikhail Kim in Norilsk; building on a thick gravel pad (usually 1–2 metres/3.3–6.6 feet thick); or using anhydrous ammonia heat pipes. The Trans-Alaska Pipeline System uses heat pipes built into vertical supports to prevent the pipeline from sinking and the Qingzang railway in Tibet employs a variety of methods to keep the ground cool, both in areas with frost-susceptible soil. Permafrost may necessitate special enclosures for buried utilities, called "utilidors".

The Melnikov Permafrost Institute in Yakutsk, found that the sinking of large buildings into the ground can be prevented by using pile foundations extending down to 15 metres (49 ft) or more. At this depth the temperature does not change with the seasons, remaining at about −5 °C (23 °F).

Thawing permafrost represents a threat to industrial infrastructure. In May 2020 thawing permafrost at Norilsk-Taimyr Energy's Thermal Power Plant No. 3 caused an oil storage tank to collapse, flooding local rivers with 21,000 cubic metres (17,500 tonnes) of diesel oil. The 2020 Norilsk oil spill has been described as the second-largest oil spill in modern Russian history.

There is no ground water available in an area underlain with permafrost. Any substantial settlement or installation needs to make some alternative arrangement to obtain water.

Industrial enzymes

From Wikipedia, the free encyclopedia

Industrial enzymes are enzymes that are commercially used in a variety of industries such as pharmaceuticals, chemical production, biofuels, food & beverage, and consumer products. Due to advancements in recent years, biocatalysis through isolated enzymes is considered more economical than use of whole cells. Enzymes may be used as a unit operation within a process to generate a desired product, or may be the product of interest. Industrial biological catalysis through enzymes has experienced rapid growth in recent years due to their ability to operate at mild conditions, and exceptional chiral and positional specificity, things that traditional chemical processes lack. Isolated enzymes are typically used in hydrolytic and isomerization reactions. Whole cells are typically used when a reaction requires a co-factor. Although co-factors may be generated in vitro, it is typically more cost-effective to use metabolically active cells.

Enzymes as a unit of operation

Immobilization

Despite their excellent catalytic capabilities, enzymes and their properties must be improved prior to industrial implementation in many cases. Some aspects of enzymes that must be improved prior to implementation are stability, activity, inhibition by reaction products, and selectivity towards non-natural substrates. This may be accomplished through immobilization of enzymes on a solid material, such as a porous support. Immobilization of enzymes greatly simplifies the recovery process, enhances process control, and reduces operational costs. Many immobilization techniques exist, such as adsorption, covalent binding, affinity, and entrapment. Ideal immobilization processes should not use highly toxic reagents in the immobilization technique to ensure stability of the enzymes. After immobilization is complete, the enzymes are introduced into a reaction vessel for biocatalysis.

Adsorption

Enzyme adsorption onto carriers functions based on chemical and physical phenomena such as van der Waals forces, ionic interactions, and hydrogen bonding. These forces are weak, and as a result, do not affect the structure of the enzyme. A wide variety of enzyme carriers may be used. Selection of a carrier is dependent upon the surface area, particle size, pore structure, and type of functional group.

Covalent binding

Example of Enzyme Immobilization through Covalent Binding

Many binding chemistries may be used to adhere an enzyme to a surface to varying degrees of success. The most successful covalent binding techniques include binding via glutaraldehyde to amino groups and N-hydroxysuccinide esters. These immobilization techniques occur at ambient temperatures in mild conditions, which have limited potential to modify the structure and function of the enzyme.

Affinity

Immobilization using affinity relies on the specificity of an enzyme to couple an affinity ligand to an enzyme to form a covalently bound enzyme-ligand complex. The complex is introduced into a support matrix for which the ligand has high binding affinity, and the enzyme is immobilized through ligand-support interactions.

Entrapment

Immobilization using entrapment relies on trapping enzymes within gels or fibers, using non-covalent interactions. Characteristics that define a successful entrapping material include high surface area, uniform pore distribution, tunable pore size, and high adsorption capacity.

Recovery

Enzymes typically constitute a significant operational cost for industrial processes, and in many cases, must be recovered and reused to ensure economic feasibility of a process. Although some biocatalytic processes operate using organic solvents, the majority of processes occur in aqueous environments, improving the ease of separation. Most biocatalytic processes occur in batch, differentiating them from conventional chemical processes. As a result, typical bioprocesses employ a separation technique after bioconversion. In this case, product accumulation may cause inhibition of enzyme activity. Ongoing research is performed to develop in situ separation techniques, where product is removed from the batch during the conversion process. Enzyme separation may be accomplished through solid-liquid extraction techniques such as centrifugation or filtration, and the product-containing solution is fed downstream for product separation.

Enzymes as a Unit Operation
Enzyme Industry Application
Palatase Food Enhance cheese flavor
Lipozyme TL IM Food Interesterification of vegetable oil
Lipase AK Amano Pharmaceutical Synthesis of chiral compounds
Lipopan F Food Emulsifier
Cellulase Biofuel Class of enzymes that degrade cellulose to glucose monomers
Amylase Food/biofuel Class of enzymes that degrade starch to glucose monomers
Xylose isomerase Food High-fructose corn syrup production
Resinase Paper Pitch control in paper processing
Penicillin amidase Pharmaceutical Synthetic antibiotic production
Amidase Chemical Class of enzymes used for non-proteinogenic enantiomerically pure amino acid production

Enzymes as a desired product

To industrialize an enzyme, the following upstream and downstream enzyme production processes are considered:

Upstream

Upstream processes are those that contribute to the generation of the enzyme.

Selection of a suitable enzyme

An enzyme must be selected based upon the desired reaction. The selected enzyme defines the required operational properties, such as pH, temperature, activity, and substrate affinity.

Identification and selection of a suitable source for the selected enzyme

The choice of a source of enzymes is an important step in the production of enzymes. It is common to examine the role of enzymes in nature and how they relate to the desired industrial process. Enzymes are most commonly sourced through bacteria, fungi, and yeast. Once the source of the enzyme is selected, genetic modifications may be performed to increase the expression of the gene responsible for producing the enzyme.

Process development

Process development is typically performed after genetic modification of the source organism, and involves the modification of the culture medium and growth conditions. In many cases, process development aims to reduce mRNA hydrolysis and proteolysis.

Large scale production

Scaling up of enzyme production requires optimization of the fermentation process. Most enzymes are produced under aerobic conditions, and as a result, require constant oxygen input, impacting fermenter design. Due to variations in the distribution of dissolved oxygen, as well as temperature, pH, and nutrients, the transport phenomena associated with these parameters must be considered. The highest possible productivity of the fermenter is achieved at maximum transport capacity of the fermenter.

Downstream

Downstream processes are those that contribute to separation or purification of enzymes.

Removal of insoluble materials and recovery of enzymes from the source

The procedures for enzyme recovery depend on the source organism, and whether enzymes are intracellular or extracellular. Typically, intracellular enzymes require cell lysis and separation of complex biochemical mixtures. Extracellular enzymes are released into the culture medium, and are much simpler to separate. Enzymes must maintain their native conformation to ensure their catalytic capability. Since enzymes are very sensitive to pH, temperature, and ionic strength of the medium, mild isolation conditions must be used.

Concentration and primary purification of enzymes

Depending on the intended use of the enzyme, different levels purity are required. For example, enzymes used for diagnostic purposes must be separated to a higher purity than bulk industrial enzymes to prevent catalytic activity that provides erroneous results. Enzymes used for therapeutic purposes typically require the most rigorous separation. Most commonly, a combination of chromatography steps is employed for separation.

The purified enzymes are either sold in pure form and sold to other industries, or added to consumer goods.

Enzymes as a Desired Product
Enzyme Industry Application
Novozym-435 Consumer Goods Isopropyl myristate production (Cosmetic)
Bromelain Food Meat tenderizer
Noopazyme Food Improve noodle quality
Asparaginase Pharmaceutical Lymphatic cancer therapeutic
Ficin Pharmaceutical Digestive aid
Urokinase Pharmaceutical Anticoagulant
β-Lactamase Pharmaceutical Penicillin allergy treatment
Subtilisin Consumer Goods Laundry detergent

Magnet school

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