Ozonolysis of organic compounds and mixtures in solution. Part I: Oleic, maleic, nonanoic and benzoic acids

2009 ◽  
Vol 11 (9) ◽  
pp. 1427 ◽  
Author(s):  
Deborah J. Last ◽  
Juan J. Nájera ◽  
Ruth Wamsley ◽  
Gareth Hilton ◽  
Max McGillen ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Benzoic Acids

scholarly journals Transformation of organic substances in the conjugate series of surface waters of North Karelia

2019 ◽  
Vol 46 (1) ◽  
pp. 43-50
Author(s):  
O. Yu. Drozdova ◽  
S. M. Ilina ◽  
N. A. Anokhina ◽  
Yu. A. Zavgorodnyaya ◽  
V. V. Demin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Substances ◽  
Organic Compounds ◽  
Natural Waters ◽  
Weighted Average ◽  
Water Soluble ◽  
Total Carbon ◽  
Benzoic Acids ◽  
Total Carbon Content ◽  
Conjugate Series

In this study, compositions of organic matter were investigated in the conjugate series of natural waters, including that from soil water, wetlands, streams, and lakes. In determinations of compositions of aliphatic and benzoic acids and humic substances, humic substances comprised the bulk of dissolved organic carbon, with 28% in lake waters and 57% in waters of wetlands and a weighted average molecular mass of 1 kDa. Aliphatic and benzoic acids comprised ≤ 2% of the total carbon content of water-soluble organic compounds. Transformations of dissolved organic matter occurred in a series of surveyed waters. Specifically, compositions and specific characteristics are dynamic, and increases in the fraction with a molecular weight of < 1 kDa were associated with photo- and bio-degradation of macromolecular organic compounds.

The Tempo and mode(S) of Prebiotic Evolution

1997 ◽  
Vol 161 ◽  
pp. 419-429 ◽  
Author(s):  
Antonio Lazcano
Keyword(s):  
Origin Of Life ◽  
Organic Compounds ◽  
Biological Evolution ◽  
Current Evidence ◽  
Early Diversification ◽  
Time Period ◽  
The Galaxy ◽  
History Of ◽  
Widespread Phenomenon ◽  
The Origin Of Life

AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the origin and early diversification of life took place in a time period of the order of 10 million years. Current evidence suggest that the abiotic synthesis of organic compounds may be a widespread phenomenon in the Galaxy and may have a deterministic nature. However, the history of the biosphere does not exhibits any obvious trend towards greater complexity or «higher» forms of life. Therefore, the role of contingency in biological evolution should not be understimated in the discussions of the possibilities of life in the Universe.

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