کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5784721 | 1639576 | 2017 | 49 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An anaerobic â¼3400Â Ma shallow-water microbial consortium: Presumptive evidence of Earth's Paleoarchean anoxic atmosphere
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: An anaerobic â¼3400Â Ma shallow-water microbial consortium: Presumptive evidence of Earth's Paleoarchean anoxic atmosphere An anaerobic â¼3400Â Ma shallow-water microbial consortium: Presumptive evidence of Earth's Paleoarchean anoxic atmosphere](/preview/png/5784721.png)
چکیده انگلیسی
By comparison with mid-Precambrian and modern sulfur-cycling ecosystems, and consistent with sulfur isotopic data and their intimate co-existence with copious microgranular pyrite and pseudomorphs evidently after sulfate, the swirled aggregates are interpreted to be anaerobic sulfuretums. In contrast, the intermixed flat-laminated components, like microbes of fossil and modern stromatolitic mat communities, are interpreted to be co-occurring light-requiring phototrophs. Whether such phototrophs were anoxygenic photosynthesizers, like extant photosynthetic bacteria (e.g., chloroflexaleans) or facultatively anaerobic cyanobacteria (cf. Oscillatoria limnetica), their anoxygenic metabolism seems plausibly established. Given its great age, shallow water habitat, and anaerobic/microaerophilic physiology, this evidently first reported occurrence from the fossil record of anoxygenic phototrophs and of a microbial sulfuretum-phototroph consortium is consistent with the supposition that Earth's Paleoarchean environment was essentially anoxic and suggests that O2-producing photosynthesis may have been a later evolutionary innovation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 299, September 2017, Pages 309-318
Journal: Precambrian Research - Volume 299, September 2017, Pages 309-318
نویسندگان
J. William Schopf, Anatoliy B. Kudryavtsev, Jeffrey T. Osterhout, Kenneth H. Williford, Kouki Kitajima, John W. Valley, Kenichiro Sugitani,