Microorganisms, Organic Carbon, and Their Relationship with 1 Oxidant Activity in Hyper-arid Mars-like Soils: Implications For

Microorganisms , Organic Carbon , and Their Relationship with 1 Oxidant Activity in Hyper - Arid Mars - like Soils : Implications for 2 Soil

پایداری خاکدانه‌ها در حضور کرم خاکی (Lumbricus terrestris L.) و مواد آلی مختلف در یک خاک آهکی

Although the crucial function of earthworms in improvement of soil physical properties is well -know, but very little is known of the interactive influence of earthworms and organic materials on soil properties such as soil aggregate stability, particularly in arid and semi-arid soils. The low organic matter content and the significant role of earthworms in improving physical properties of arid...

Substrate Stereo Selectivity May Be Used to Distinguish between Chemical and Biological Reactivity on Mars

In the Viking labeled release experiment, organic compounds added to the Martian soil were rapidly degraded as if the soil contained live microorganisms [1]. But failure to detect native organic carbon raised the possibility of a chemical reactivity as caused by the presence of inorganic oxidants [2, 3]. The debate between pro-life and anti-life views is likely to intensify in light of the resu...

Microbial colonization of halite from the hyper-arid Atacama Desert studied by Raman spectroscopy.

The hyper-arid core of the Atacama Desert (Chile) is the driest place on Earth and is considered a close analogue to the extremely arid conditions on the surface of Mars. Microbial life is very rare in soils of this hyper-arid region, and autotrophic micro-organisms are virtually absent. Instead, photosynthetic micro-organisms have successfully colonized the interior of halite crusts, which are...

O2- ions and the Mars labeled release response.

Yen et al. (1) propose that O 2 – ions puta-tively formed in the soil of Mars, not microorganisms , represent " the most straightforward explanation " of my 1976 Viking labeled release (LR) life detection results. Data from radioactive organic nutrients added to martian soil (2), however, challenge that conclusion. In the data reported by Yen et al. [figure 3 of (1)], O 2 – radicals lose only 1...