کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8143744 | 1523939 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adaptation of an Antarctic lichen to Martian niche conditions can occur within 34 days
ترجمه فارسی عنوان
تطبیق لیکشن قطب جنوب به شرایط جغرافیایی مریخ می تواند در عرض 34 روز رخ دهد
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
Stresses occurring on the Martian surface were simulated in a Mars Simulation Chamber (MSC) and included high UV fluxes (Zarnecki and Catling, 2002), low temperatures, low water activity, high atmospheric CO2 concentrations, and an atmospheric pressure of about 800Â Pa (Kasting et al., 1991, Head et al., 2003). The lichen Pleopsidium chlorophanum is an extremophile that lives in very cold, dry, high-altitude habitats, which are Earth's best approximation of the Martian surface. Samples with P. chlorophanum were exposed uninterruptedly to simulated conditions of the unprotected Martian surface (i.e. 6344Â kJÂ mâ2) and protected niche conditions (269Â kJÂ mâ2) for 34 days. Under unprotected Martian surface conditions the fungal symbiont decreases its metabolic activity and it was unclear if the algal symbiont of the lichen was still actively photosynthesizing. However, under “protected site” conditions, the entire lichen not only survived and remained photosynthetically active, it even adapted physiologically by increasing its photosynthetic activity over 34 days.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 98, August 2014, Pages 182-190
Journal: Planetary and Space Science - Volume 98, August 2014, Pages 182-190
نویسندگان
Jean-Pierre de Vera, Dirk Schulze-Makuch, Afshin Khan, Andreas Lorek, Alexander Koncz, Diedrich Möhlmann, Tilman Spohn,