JMDMT #553 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - Production of Primitive Protein 493 In the context of the orighi of livhig units, one inference is that nature had almost endless opportunities to experiment with precellular forms until the necessary apparatus for repHcation was included by chance....
JMDMT #552 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - has been accomplished in thousands of variations in the laboratory. We now regard processes 3 and 4 as so rugged and so inexorable as to believe that they could and should have occurred on many occasions in many places in the universe. Also, the...
JMDMT #547 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - the system before the macro- molecules are organized into supramolecular entities. These formed units are of interest as precell models alternative to Oparin's coacervate droplets, also studied as precell models.- They and derivatives are of...
JMDMT #539 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - PRIMITIVE PROTEIN AND FORMED MICROPARTICLES* Sidney W. Fox and Shuhei Yuyama Institute for Space Biosciences, The Florida State I'niversity, Tallahassee, Florida This presentation of results with a thermal model of origins will focus par-...
JMDMT #528 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - are not necessary, which make it the more plausible that these radiation syntheses were responsible for the occurrence of amino acids in the oceans of the primitive earth." It was there that they could be used to further evolution. EVOLUTIONS...
JMDMT #503 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - were responsible for the formation of a number of polymeric compounds including polypeptides. In fact, it is known that un- substituted cyanamide can be used for the synthesis of peptides." Synthesis of Polymicleotides A possible abiogenic...
JMDMT #499 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - amino acids, under condi- tions presumed to have existed on the primitive Earth were initiated by Fox and 476 Annals New York Academy of Sciences Middlebrook/ and by Akabori. This work has been reviewed recently'*" and has been extended by other...
JMDMT #497 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - the presence of a strong mineral acid.''''' A strong mineral acid transforms malic acid into malonic semialde- hyde which then condenses with urea to form uracil. ' Also, in line with the above mechanism, it is known from the work of Bredereck et...
JMDMT #492 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - electrons, which were carried under reducing condi- tions. Other workers have also observed the formation of guanidine- and urea'' from cyanides, cyanogen, or cyanates. The above experiments on the synthesis of adenine from mixtures of hydrogen...
JMDMT #488 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection -proceed through the imidazole pathway. The first demonstration of the spontaneous synthesis of adenine from hydrogen cyanide under conditions presumed to have existed on the primitive Earth was made relatively recently in our labora- tory,* and in...
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