U.S.A, Jan 30, 2017: NASA scientists have developed a new chemical assay that could aid the search for life on exoplanets by identifying the presence of amino acids, the compounds that make up proteins and are the building blocks of life.
The test uses a liquid-based technique known as capillary electrophoresis to separate a mixture of organic molecules into its components.
It was designed by researchers from NASA’s Jet Propulsion Laboratory (JPL) in the US specifically to analyse for amino acids, the structural building blocks of all life on Earth.
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The method is 10,000 times more sensitive than current methods employed by spacecraft like NASA’s Mars Curiosity rover, according to researchers.
One of the key advantages of the new way of using capillary electrophoresis is that the process is relatively simple and easy to automate for liquid samples expected on ocean world missions.
It involves combining a liquid sample with a liquid reagent, followed by chemical analysis under conditions determined by the team.
By shining a laser across the mixture – a process known as laser-induced fluorescence detection – specific molecules can be observed moving at different speeds. They get separated based on how quickly they respond to electric fields.
While capillary electrophoresis has been around since the early 1980s, this is the first time it has been tailored specifically to detect extraterrestrial life on an ocean world, said Jessica Creamer, a postdoctoral scholar at JPL.
“Our method improves on previous attempts by increasing the number of amino acids that can be detected in a single run,” Creamer said.
“Additionally, it allows us to detect these amino acids at very low concentrations, even in highly salty samples, with a very simple ‘mix and analyse’ process,” she said.
The researchers used the technique to analyse amino acids present in the salt-rich waters of Mono Lake in California.
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The lake’s exceptionally high alkaline content makes it a challenging habitat for life, and an excellent stand-in for salty waters believed to be on Mars, or the ocean worlds of Saturn’s moon Enceladus and Jupiter’s moon Europa.
The researchers were able to simultaneously analyse 17 different amino acids, which they are calling “the Signature 17 standard.” These amino acids were chosen for study because they are the most commonly found on Earth or elsewhere.
“Using our method, we are able to tell the difference between amino acids that come from non-living sources like meteorites versus amino acids that come from living organisms,” said the project’s principal investigator, Peter Willis of JPL.
The study was published in the journal Analytical Chemistry. (IANS)
Recently, scientists have found layers of ice on the Martian land.
Scientists think this ice might be a useful source of water for future humans.
The researchers had researched 8 locations on the surface of Mars.
Scientists have unearthed thick and massive deposits of ice in some regions on Mars.
The images taken by the High-Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter (MRO) showed the three-dimensional structure of massive ice deposits on Mars.
The ice sheets extend from just below the surface to a depth of 100 meters or more and appear to contain distinct layers.
It extending downward from depths as shallow as 1 to 2 meters below the surface, which could preserve a record of Mars’ past climate, the researchers noted in the journal Science.
“We expect the vertical structure of Martian ice-rich deposits to preserve a record of ice deposition and past climate,” said Colin M. Dundas, from the US Geological Survey.
“They might even be a useful source of water for future human exploration of the red planet,” Dundas added.
The researchers investigated eight locations on Mars and found thick deposits cover broad regions of the Martian mid-latitudes with a smooth mantle.
However, erosion in these regions creates scarps that expose the internal structure of the mantle.
The scarps are actively retreating because of sublimation of the exposed water ice.
The ice deposits likely originated as snowfall during Mars’ high-obliquity periods and have now compacted into massive, fractured, and layered ice.
Previous researchers have revealed that the Red Planet harbours subsurface water ice.
Recent observations by MRO’s ground-penetrating Shallow Radar instrument revealed a buried ice layer that covers more ground than the state of New Mexico.
NASA’s Phoenix lander had also dug up some ice near the Martian north pole in 2008, however, it is not clear if that is part of the big sheet. IANS