Wednesday, January 9, 2019

Planetary scientist Vlada Stamenkovi? of the NASA Jet Propulsion Laboratory and colleagues have developed a new chemical model of how oxygen dissolves in Martian conditions, which raises the possibility of oxygen-rich brines; enough, the work suggests, to support simple animals such as sponges. The model was published in Nature on October 22. Wikinews caught up with him in an email interview to find out more about his team’s research and their plans for the future.

The atmosphere of Mars is far too thin for humans to breathe or for lungs like ours to extract any oxygen at all. It has on average only around 0.6% of the pressure of Earth’s atmosphere, and this is mainly carbon dioxide; only 0.145% of the thin Martian atmosphere is oxygen. The new model indicated these minute traces of oxygen should be able to enter salty seeps of water on or near the planet’s surface at levels high enough to support life forms comparable to Earth’s microbes, possibly even simple sponges. Some life forms can survive without oxygen, but oxygen permits more energy-intensive metabolism. Almost all complex multicellular life on Earth depends on oxygen.

“We were absolutely flabbergasted […] I went back to recalculate everything like five different times to make sure it’s a real thing,” Stamenkovi? told National Geographic.

“Our work is calling for a complete revision for how we think about the potential for life on Mars, and the work oxygen can do,” he told Scientific American, “implying that if life ever existed on Mars it might have been breathing oxygen”.

Stamenkovi? et al cite research from 2014 showing some simple sponges can survive with only 0.002 moles of oxygen per cubic meter (0.064 mg per liter). Some microbes that need oxygen can survive with as little as a millionth of a mole per cubic meter (0.000032 mg per liter). In their model, they found there can be enough oxygen for microbes throughout Mars, and enough for simple sponges in oases near the poles.

In 2014, also suggesting multicellular life could exist on Mars, de Vera et al, using the facilities at the German Aerospace Center (DLR), studied some lichens, including Pleopsidium chlorophanum, which can grow high up in Antarctic mountain ranges. They showed those lichens can also survive and even grow in Mars simulation chambers. The lichens can do this because their algal component is able to produce the oxygen needed by the fungal component. Stamenkovi? et al’s research provides a way for oxygen to get into the Martian brines without algae or photosynthesis.

Stamenkovi? et al found oxygen levels throughout Mars would be high enough for the least demanding aerobic (oxygen-using) microbes, for all the brines they considered, and all the methods of calculation. They published a detailed map^[3] of the distributions of solubility for calcium perchlorates for their more optimistic calculations, which they reckoned were closer to the true case, with and without supercooling. The lowest concentrations were shown in the tropical southern uplands. Brine in regions poleward of about 67.5° to the north and about 72.5° to the south could have oxygen concentrations high enough for simple sponges. Closer to the poles, concentrations could go higher, approaching levels typical of sea water on Earth, 0.2 moles per cubic meter (6.4 mg per liter), for calcium perchlorates. On Earth, worms and clams that live in the muddy sea beds require 1 mg per liter, bottom feeders such as crabs and oysters 3 mg per liter, and spawning migratory fish 6 mg per liter, all within 0.2 moles per cubic meter, 6.4 mg per liter.

((Wikinews)) Does your paper’s value of up to 0.2 moles of oxygen per cubic meter, the same as Earth’s sea water, mean that there could potentially be life on Mars as active as our sea worms or even fish?

Stamenkovi?: Mars is such a different place than the Earth and we still need to do so much more work before we can even start to speculate.

Stamenkovi? et al studied magnesium and calcium perchlorates, common on Mars. They found the highest oxygen concentrations occur when the water is colder, which happens most in polar regions.

((WN)) The temperatures for the highest levels of oxygen are really low, -133 °C, so, is the idea that this oxygen would be retained when the brines warm up to more habitable temperatures during the day or seasonally? Or would the oxygen be lost as it warms up? Or — is the idea that it has to be some exotic biochemistry that works only at ultra low temperatures like Dirk Schulze-Makuch’s life based on hydrogen peroxide and perchlorates internal to the cells as antifreeze?

Stamenkovi?: The options are both: first, cool oxygen-rich environments do not need to be habitats. They could be reservoirs packed with a necessary nutrient that can be accessed from a deeper and warmer region. Second, the major reason for limiting life at low temperature is ice nucleation, which would not occur in the type of brines that we study.

Stamenkovi? et al’s paper is theoretical and is based on a simplified general circulation model of the Mars atmosphere — it ignores distinctions of seasons and the day / night cycle. Stamenkovi?’s team combined it with a chemical model of how oxygen would dissolve in the brines and used this to predict oxygen levels in such brines at various locations on Mars.

When asked about plans for a future model that might include seasonal timescales, Stamenkovi? told Wikinews, “Yes, we are now exploring the kinetics part and want to see what happens on shorter timescales.”

Stamenkovi? et al’s model also takes account of the tilt of the Mars axis, which varies much more than Earth’s does.

Wikinews asked Stamenkovi? if he had any ideas about whether and how sponges could survive through times when the tilt was higher and less oxygen would be available:

((WN)) I notice from your figure^[4] that there is enough oxygen for sponges only at tilts of about 45 degrees or less. Do you have any thoughts about how sponges could survive periods of time in the distant past when the Mars axial tilt exceeds 45 degrees, for instance, might there be subsurface oxygen-rich oases in caves that recolonize the surface? Also what is the exact figure for the tilt at which oxygen levels sufficient for sponges become possible? (It looks like about 45 degrees from the figure but the paper doesn’t seem to give a figure for this.)

Stamenkovi?: 45 deg is approx. the correct degree. We were also tempted to speculate about this temporal driver but realized that we still know so little about the potential for life on Mars/principles of life that anything related to this question would be pure speculation, unfortunately.

((WN)) How quickly would the oxygen get into the brines — did you investigate the timescale?

Stamenkovi?: No, we did not yet study the dynamics. We first needed to show that the potential is there. We are now studying the timescales and processes.

((WN)) Could the brines that Nilton Renno and his teams simulated, forming on salt/ice interfaces within minutes in Mars simulation conditions, get oxygenated in the process of formation? If not, how long would it take for them to get oxygenated to levels sufficient for aerobic microbes? For instance could the Phoenix leg droplets have taken up enough oxygen for aerobic respiration by microbes?

Stamenkovi?: Just like the answer above. Dynamics is still to be explored. (But this is a really good question ?).

Wikinews also asked Stamenkovi? how their research is linked to the recent discovery of possible large subglacial lake below the Martian South Pole found through radar mapping.

((WN)) Some news stories coupled your research with the subglacial lakes announcement earlier this year. Could the oxygen get through ice into layers of brines such as the possible subglacial lakes at a depth of 1.5 km?

Stamenkovi?: There are other ways to create oxygen. Radiolysis of water molecules into hydrogen and oxygen can liberate oxygen in the deep and that O₂ could be dissolved in deep groundwater. The radiolytic power for this would come from radionuclides naturally contained in rocks, something we observe in diverse regions on Earth.

((WN)) And I’d also like to know about your experiment you want to send to Mars to help with the search for these oxygenated brines.

Stamenkovi?: We are now developing at “NASA/JPL-California Institute of Technology” a small tool, called TH2OR (Transmissive H2O Reconnaissance) that might one day fly with a yet-to-be-determined mission. It will use low frequency sounding techniques, capable of detecting groundwater at depths down to ideally a few km under the Martian surface, thanks to the high electric conductivity of only slightly salty water and Faraday’s law of induction. Most likely, such a small and affordable instrument could be placed stationary on the planet’s surface or be carried passively or actively on mobile surface assets; TH2OR might be also used in combination with existing orbiting assets to increase its sounding depth. Next to determining the depth of groundwater, we should also be able to estimate its salinity and indirectly its potential chemistry, which is critical information for astrobiology and ISRU (in situ resource utilization).

((WN)) Does your TH2OR use TDEM like the Mars 94 mission — and will it use natural ULF sources such as solar wind, diurnal variations in ionosphere heating and lightning?

Stamenkovi?: The physical principle it uses is the same and this has been used for groundwater detection on the Earth for many decades; it’s Faraday’s law of induction in media that are electrically conducting (as slightly saline water is).

Stamenkovi?: However, we will focus on creating our own signal as we do not know whether the EM fields needed for such measurements exist on Mars. However, we will also account for the possibility of already existing fields.

Thursday, December 13, 2007

Victoria Wyndham was one of the most seasoned and accomplished actresses in daytime soap opera television. She played Rachel Cory, the maven of Another World‘s fictional town, Bay City, from 1972 to 1999 when the show went off the air. Wyndham talks about how she was seen as the anchor of a show, and the political infighting to keep it on the air as NBC wanted to wrest control of the long-running soap from Procter & Gamble. Wyndham fought to keep it on the air, but eventually succumbed to the inevitable. She discusses life on the soap opera, and the seven years she spent wandering “in the woods” of Los Angeles seeking direction, now divorced from a character who had come to define her professional career. Happy, healthy and with a family she is proud of, Wyndham has found life after the death of Another World in painting and animals. Below is David Shankbone’s interview with the soap diva.

Monday, February 11, 2008

The United Arab Emirates (UAE) has started construction of its so called ‘green city‘ which will be named Masdar City. It is a city which is designed to have no carbon emissions, cars, or waste. It will cost $22 billion (£11 billion) and take eight years to make. It will be able to hold a population of 50,000 people and 1,500 businesses. The city will cover 1,483 acres (6.00 km²).

The city was designed by Foster and Partners, a British company.

“No one has ever built a zero-carbon city before. Nor one producing zero waste or fully powered by renewable energy. Masdar City will accomplish all three,” said Sultan Al Jaber.

The city will have a personal electrical power supply mainly from two renewable energy sources: wind turbines and solar panels. Water will be provided through a solar-powered desalination plant and air conditioning will be provided naturally from wind towers.

It is planned to save more than $2 billion in oil over the next 25 years along with creating more than 70 000 jobs.

The immense project will be supported by a company created for it called ‘Masdar Initiative’, which will develop and commercialise clean energy technologies. It will also be supported by the WWF, a global conservation charity, and it is hoped that international joint ventures will bring in more money.

Some people fear that Masdar will become a domain for the luxury development of the rich, because the city is located by Abu Dhabi and Abu Dhabi International Airport.

Dr Al Jaber said, “We are often asked why we are setting our goal so high. Our answer is because someone must… Someone must push the envelope to create the solution that we, as a global community, so urgently require.”

Tuesday, January 19, 2010

Officials from France and Germany have warned people against using Microsoft’s Internet Explorer, citing security holes, and encouraged users to find an alternate browser to surf the Internet.

The government agency Certa, which oversees cyber attacks and security, warned against using all versions of Internet Explorer. Officials from Germany had warned last Friday against the browser when malicious code was published on the Internet.

“Pending a patch from the publisher, Certa recommends using an alternative browser,” Certa said in a statement.

Graham Cluley, from the security firm Sophos, said that the weakness had only been exploited in IE6, but he noted that “Microsoft themselves admit there is a vulnerability, even in IE8.” He noted that, since more information into the malicious code is now available on the internet, hackers could alter the code to make it affect other versions of the browser.

The head of Microsoft’s security and privacy department, however, commented that “the risk is minimal. There are very few of them out there,” adding that in order for a computer to be infected by a virus, it would have to be running IE6 and be on a compromised website. “If you look at other browsers, it’s likely they will have other vulnerabilities,” he said to the BBC. “We feel strongly that IE8 is most secure browser on the market.”

Microsoft encouraged users to upgrade to IE8, which they described as the “most secure browser on the market”.

The firm is working on a patch to fix the problem, however, a spokesman said there wasn’t any specific timeframe for its release.

Thursday, November 8, 2012

Tens of thousands have been displaced and at least 25 people killed in southern India due to torrential rains and heavy flooding during the last week.

According to officials in the Indian state of Andhra Pradesh, almost 100,000 people have been forced to leave their homes due to severe weather, with 95,000 people in government-run relief camps. The districts of Visakhapatnam, East and West Godavari, Krishna, Guntur and Khammam were hardest hit. So far, 25 people have died in the state as a result of the torrential rains and heavy flooding. An additional 15 people were killed in the neighboring state of Tamil Nadu.

The weather has significantly disrupted normal life as well as traffic. When the flood waters recede, farmers in the region may also see that almost all their crops were destroyed by the flooding.

“The unseasonal rainfall has destroyed our crops and our entire field is submerged in water,” says Arku Rajaipa, a farmer in Gunthur district. He also said that his family would be forced to rely on the government for food for the rest of the year.

Prime Minister Manmohan Singh has offered federal support for the affected areas and contacted the Chief Minister of Andhra Pradesh.

Wednesday, October 22, 2008

Monday saw the latest edition of the vetted version of Wikipedia, which is aimed at educational use, go quietly online. The extensively revised version covers over five thousand topics, targeting the eight to seventeen years age group. Partnerships with the Shuttleworth Foundation and the Hole in the Wall project will see it distributed in South Africa and India as well as copies being available globally via the offices of SOS Children UK’s umbrella organisation, SOS Kinderdorf worldwide.

First launched in 2006 as a 4,000 article edition, the extract of Wikipedia has employed hi-tech distribution methods, as well as offering a website version which has steadily climbed up in ranking to above other reviewed Wikipedia rivals and copies; the 2007 version was available on the BitTorrent peer to peer network to keep distribution costs down and was equivalent to a fifteen-volume printed encyclopedia. Monday’s release is compared to a twenty-volume print edition.

Key to the process for selecting articles is the English National Curriculum and similar educational standards around the world. The initial vision was to bring this wealth of knowledge to schools where access to the Internet was poor or unavailable, but copies of Wikipedia for Schools can be found on many first world school intranets and web servers. Among the compelling reasons to adopt the project are the vetting and additional study materials which overcome the oft-publicised concerns many educators have with the million article plus Wikipedia that anyone can edit.

In today’s press release announcing the launch, Wikimedia Foundation Executive Director Sue Gardner expressed delight at seeing the project bring out a new version, “Our goal is to make Wikipedia accessible to as many people as possible around the world, and SOS Children is a great partner that helps us make that happen. Wikipedia is released under a free content license so that individuals and institutions can easily adapt, reuse and customize its content: we encourage others, like SOS Children, to do exactly that.”

Running 192 schools in the developing world, SOS Children sees Wikipedia for Schools as a key piece in fulfilling the educational aspect of their mission. SOS Children’s Chairwoman, Mary Cockcroft gave us an introduction and, a Wikipedia administrator himself, the charity’s CEO Andrew Cates spoke to Wikinews at length about the project.

You are part of SOS-Kinderdorf International, can you explain a little about how this works in terms of distributing funds raised in the UK and involving UK citizens in work outside the country?

Mary Cockcroft: SOS Children[‘s Villages] is a “club” of member charities in 130 countries helping orphans and vulnerable children. The club elects SOS-Kinderdorf International as secretary. SOS is a large organisation whose members in aggregate turned over $1bn in 2007, and whose projects include owning and running 192 schools and family-based care for 70,000 children. However much of these funds are raised locally, with for example the member charities in each of India, Pakistan and South Africa raise considerably more funds in their own country than SOS UK does from the UK. Nonetheless SOS Children UK principally raises funds to finance projects in the developing world, and has only financially small projects in the UK (such as the Schools Wikipedia, which is very low cost because of extensive use of volunteers). This year we expect about 80% of our UK income will leave the UK for overseas SOS associations, and some of the remaining 20% will pay for project oversight. We do not spend money in the UK on Direct Mail or TV advertising. Our UK office is involved in overseeing projects we finance and a small number of high-skilled volunteers from the UK help overseas. However around 98% of SOS staff worldwide are local nationals, as are most volunteers.

((WN)) How much work does the UK charity actually carry out within the home country? Are there failings within the government system for orphans and other needy children that you feel obliged to remedy?

MC: We are deeply unhappy about the situation of children in out-of-home care in the UK. However our care model of 168 hour-a-week resident mothers does not fit with the UK philosophy for children without parental care. Internationally SOS always has a policy of sharing best practice and we are working to improve understanding of our way of working, which appears to us to have far better outcomes than the existing one in the UK. Ultimately though the legal responsibility for these children lies with government and we cannot remedy anything without their invitation.

((WN)) Who first came up with the idea of doing a vetted Wikipedia extract? What was the impetus? Was it more for the developing world than first world?

Andrew Cates: I honestly cannot remember who first suggested it, but it came from somewhere in the Wikipedia community rather than from the charity. The original product was very much pitched at the developing world where the Internet is only available if at all over an expensive phone line. I worked in West Africa 1993-1996 and I know well at how thirsty for knowledge people are and how ingenious they will be in overcoming technical obstacles if the need for infrastructure is removed.

((WN)) In reading past year’s announcements there’s some pride in the project being picked up and used in the first world, was this expected or a pleasant surprise?

AC: It was a pleasant surprise. I don’t think we had realised what the barriers schools faced in using the main Wikipedia were. It isn’t just pupils posting material about teachers or meeting strangers: the “Random Article” button on every page could potentially deliver an article on hardcore porn. We had already started when discussion broke on banning Wikipedia from classrooms and I am sure we benefited from it.

((WN)) Can you give an outline of the selection and vetting process? Is it primarily Wikipedians working on this, or are people from the educational establishment brought in?

AC: It was a long and painful process, even with a really good database system. Articles were taken into the proposal funnel from three main sources: direct proposals for inclusion from Wikipedians, lists which came from the Release Version team and proposals drawn up from working through National Curriculum subjects by SOS volunteers. In a few cases where we felt articles were missing we asked the community to write them (e.g. Portal:Early Modern Britain, which is a curriculum subject, was kindly written just for us): These “proposals” were then looked at by mainly SOS volunteers (some onwiki, some offline). Our offices are in the middle of Cambridge and we get high quality volunteers, who skim read each article and then compared two versions from the article history by credible WP editors a significant period apart (this picks up most graffiti vandalism which runs at about 3% of articles). Once they had identified a “best” version they marked any sections or text strings for deletion (sections which were just a list of links to other articles not included, empty sections, sex scandals etc). A substantial sample of each volunteers work was then doubled checked for quality by one of two office staff (of whom I was one). We then have a script which does some automated removals and clean ups. Once we had a selection we posted it to relevant wikiprojects and a few “experts” and got any extra steers.

((WN)) Will you be making use of BitTorrent for distribution again this year? Was it a success in 2007?

AC: BitTorrent was a bit disappointing in that it got us the only substantial criticisms we received online. A lot of people find it too much effort to use. However for the period we offered a straight http: download we had huge problems with spiders eating vast bandwidth (the file is 3.5G: a few thousand rogue spider downloads and it starts to hurt). As per last year therefore our main two channels will be free download by BitTorrent and mailing the DVDs free all over the world. At a pinch we will (as before) put straight copies up for individuals who cannot get it any other way, and we have some copies on memory sticks for on distributors.

((WN)) Is it your opinion that the UK Government should be encouraging the adoption of projects like this as mainstream educational resources?

AC: Clearly yes. We have had a very enthusiastic reaction from schools and the teaching community. We think every school should have an intranet copy. We expect the Government to catch on in a few years. That is not to say that Wikipedia is as good as resources developed by teachers for teachers such as lesson plans etc. but it is a fantastic resource.

((WN)) You’re a Wikipedia administrator, all too often a thankless task. What prompted you to get involved in the first place? What are the most notable highs and lows of your involvement with the project?

AC: Funnily the thing I have found most amazing about Wikipedia is not widely discussed, which is the effect of Wikipedia policies on new editors. I have seen countless extreme POV new editors, who come in and try to get their opinions included slowly learn not only that there are other opinions to consider but that elements of their own opinion which are not well founded. Watching someone arrive often (on pages on religions for example) full of condemnation for others, gradually become understanding and diplomatic is one of the biggest buzzes there is. The downside though is where correcting things which are wrong is too painfully slow because you need to find sources. I was a post-doc at Cambridge University in combustion and I know the article on Bunsen burners has several really significant errors concerning the flame structure and flow structure. But sadly I cannot correct it because I am still looking around for a reliable source.

((WN)) Do you believe schools should encourage students to get involved contributing to the editable version of Wikipedia? Does SOS Children encourage those who are multilingual to work on non-English versions?

AC: I think older students have a lot to learn from becoming involved in editing Wikipedia.

((WN)) To close, is there anything you’d like to add to encourage use of Wikipedia for Schools, or to persuade educators to gain a better understanding of Wikipedia?

AC: I would encourage people to feed back to the project online or via the charity. The Wikipedia community set out to help educate the world and are broadly incredibly well motivated to help. As soon as we understand what can be done to improve things people are already on the task.

((WN)) Thank you for your time.