[生命在于运动国旗下讲话五篇]【关于运动的国旗下讲话】敬的老师们，亲爱的同学们：大家早上好。年轻的生命如同灼灼的火焰，只有跳动的火苗才显得生动。飞驰的溪流滋润大地，滋养万物，这定然美于冬日溪水的冰...+阅读
Life on Mars
Life Marker Chip
Astronomers suspect that microscopic life exists on Mars, or maybe it did. The ExoMars mission funded by the European Space Agency aims to find out. Since the 17th century the possibility of intelligent life on Mars has fascinated us. Scientific speculation encouraged the popular belief that Mars was like Earth, plete with continents and oceans, even 'canals' built by sentient beings to irrigate deserts. In the early 1920's radio stations were requested by the US government to observe silence so transmissions from Martians could be heard.
Mars missions in the 1970's dismissed any question of life on Mars, Did Bowie even wrote a song about this. Subsequently the red pla became a dramatic location for human colonization. These days, parisons with Earth are made at a molecular level and the UK-developed Life Marker Chip will be crucial in the ExoMars's hunt for the carbon-based molecules associated with life.
Test for life
Leicester University's Dr Mark Sims, project leader, describes the Life Marker Chip principle, 'what we use are molecular receptors which are binations of proteins which act like a lock, the target molecule which we'
re trying to find is the key.'
The process is likened to a 'pregnancy test' for life. Dr Sims explains, 'We're putting the receptors down on to a surface, flowing across the anic molecules, getting them to bind to the molecular receptors as spots. Using a fluorescing process we then capture an image of those dots and we can send that image back to Earth. By analysing which dots glow we know which molecules are present.'
Signs of life
The potential molecules he been pared down to about 63 and fall in to four classes. Dr Sims describes them, firstly 'The anics which result from meteorites falling on the surface containing carbon molecules. Then the markers left by extinct life, which may he existed three or four million years ago. Thirdly, the molecules associated with existing life. Lastly, there are molecules deposited by spacecraft contamination.'
Earthlings can further benefit from the LMC's sensitivity. Dr Sims emphasizes the LMC's effectiveness in health diagnostics, detecting bacterial levels in hospitals, or in forensic science for detecting microscopic evidence at crime scenes. Meanwhile, we await transmissions from ExoMars to confirm signs of life on Mars.
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