Organic Life Emergence Period
An Organic Life Emergence Period is a emergence period when organic life arose.
- AKA: Abiogenesis.
- Context:
- It can range from being an Terrestrial Organic Life Emergence Period (on Earth) to being an Extraterrestial Organic Life Emergence Period (on extrasolar Goldi-locks planet).
- …
- Counter-Example(s):
- See: Life, Organic Compound, Eoarchean, Life On Earth, Biogenic Substance, Microbial Mat.
References
2014
- (Wikipedia, 2014) ⇒ http://en.wikipedia.org/wiki/Abiogenesis Retrieved:2014-2-22.
- Abiogenesis ( /ˌeɪbaɪ.ɵˈdʒɛn
ɪsɪs/ [1] ) or biopoiesis [2] is the natural process by which life arose from non-living matter such as simple organic compounds. [3] The earliest life on Earth existed at least 3.5 billion years ago,[4] [5] [6] during the Eoarchean Era when sufficient crust had solidified following the molten Hadean Eon. The earliest specific evidence for life on Earth is biogenic graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland[7] and microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia.[8] [9]Scientific hypotheses about the origins of life can be divided into a number of categories. Many approaches investigate how self-replicating molecules or their components came into existence. On the assumption that life originated spontaneously on Earth, the Miller–Urey experiment and similar experiments demonstrated that most amino acids, often called "the building blocks of life", can be racemically synthesized in conditions intended to be similar to those of the early Earth. Several mechanisms have been investigated, including lightning and radiation. Other approaches ("metabolism first" hypotheses) focus on understanding how catalysis in chemical systems in the early Earth might have provided the precursor molecules necessary for self-replication.
- Abiogenesis ( /ˌeɪbaɪ.ɵˈdʒɛn
- ↑ Pronunciation: The New Oxford Dictionary of English (1998) ISBN 0-19-861263-X - p.3 "Abiogenesis /ˌeɪbʌɪə(ʊ)ˈdʒɛnɪsɪs/".
- ↑ Bernal, J.B. (1960) "Problem of the stages in biopoesis" (in "Aspects of the Origin of Life")
- ↑ "Did life come from another world?" Scientific American '293, 64 - 71 (2005).
- ↑ Schopf, JW, Kudryavtsev, AB, Czaja, AD, and Tripathi, AB. (2007). Evidence of Archean life: Stromatolites and microfossils. Precambrian Research 158:141-155.
- ↑ Schopf, JW (2006). Fossil evidence of Archaean life. Philos Trans R Soc Lond B Biol Sci 29;361(1470) 869-85.
- ↑ Peter Hamilton Raven; George Brooks Johnson (2002). Biology. McGraw-Hill Education. p. 68. ISBN 978-0-07-112261-0. http://books.google.com/books?id=GtlqPwAACAAJ. Retrieved 7 July 2013.
- ↑ Yoko Ohtomo, Takeshi Kakegawa, Akizumi Ishida, Toshiro Nagase, Minik T. Rosing (8 December 2013). "Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks". Nature Geoscience. doi:10.1038/ngeo2025. http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2025.html. Retrieved 9 Dec 2013.
- ↑ Template:Cite news
- ↑ Noffke, Nora; Christian, Daniel; Wacey, David; Hazen, Robert M. (8 November 2013). "Microbially Induced Sedimentary Structures Recording an Ancient Ecosystem in the ca. 3.48 Billion-Year-Old Dresser Formation, Pilbara, Western Australia". Astrobiology (journal). Bibcode 2013AsBio..13.1103N. doi:10.1089/ast.2013.1030. http://online.liebertpub.com/doi/abs/10.1089/ast.2013.1030. Retrieved 15 November 2013.