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Biologically Enhanced Energy and Carbon Cycling on Titan?

机译：泰坦生物增强了能量和碳循环？

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摘要

With the Cassini-Huygens Mission in orbit around Saturn, the large moon Titan, with its reducing atmosphere, rich organic chemistry, and heterogeneous surface, moves into the astro-biological spotlight. Environmental conditions on Titan and Earth were similar in many respects 4 billion years ago, the approximate time when life originated on Earth. Life may have originated on Titan during its warmer early history and then developed adaptation strategies to cope with the increasingly cold conditions. If organisms originated and persisted, metabolic strategies could exist that would provide sufficient energy for life to persist, even today. Metabolic reactions might include the catalytic hydrogenation of photochemically produced acetylene, or involve the recombination of radicals created in the atmosphere by ultraviolet radiation. Metabolic activity may even contribute to the apparent youth, smoothness, and high activity of Titan's surface via biothermal energy.
机译：随着“卡西尼-惠更斯”探测器进入土星轨道，具有减少大气层，丰富的有机化学物质和非均质表面的大型卫星土卫六进入了天体生物学的视野。 40亿年前，即生命起源于地球的大致时间，土卫六与地球的环境条件在许多方面都相似。生命可能起源于泰坦早期的温暖时期，然后发展了适应策略以应对日益严峻的气候条件。如果生物起源并持续存在，则可能存在可以为生命提供足够能量以维持生命的代谢策略，即使在今天。代谢反应可能包括光化学生成的乙炔的催化加氢，或者涉及紫外线辐射在大气中产生的自由基的重组。代谢活动甚至可能通过生物热能促进土卫六表面的明显年轻，光滑和高活性。

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