NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 25 of 2571
Prebiotic synthesis in atmospheres containing CH4, CO, and CO2. I - Amino acids
Author and Affiliation:
Schlesinger, G.(California Univ., La Jolla, CA, United States)
Miller, S. L.(California, University, La Jolla, CA, United States)
Abstract: The prebiotic synthesis of amino acids, HCN, H2CO, and NH3 using a spark discharge on various simulated primitive earth atmospheres at 25 C is investigated. Various mixtures of CH4, CO, CO2, N2, NH3, H2O, and H2 were utilized in different experiments. The yields of amino acids (1.2-4.7 percent based on the carbon) are found to be approximately independent of the H2/CH4 ratio and the presence of NH3, and a wide variety of amino acids are obtained. Glycine is found to be almost the only amino acid produced from CO and CO2 model atmospheres, with the maximum yield being about the same for the three carbon sources at high H2/carbon ratios,whereas CH4 is superior at low H2/carbon ratios. In addition, it is found that the directly synthesized NH3 together with the NH3 obtained from the hydrolysis of HCN, nitriles, and urea could have been a major source of ammonia in the atmosphere and oceans of the primitive earth. It is determined that prebiotic syntheses from HCN and H2CO to give products such as purines and sugars and some amino acids could have occurred in primitive atmospheres containing CO and CO2 provided the H2/CO and H2/CO2 ratios were greater than about 1.0.
Publication Date: Sep 01, 1983
Document ID:
19830068403
(Acquired Nov 30, 1995)
Accession Number: 83A49621
Subject Category: SPACE BIOLOGY
Document Type: Journal Article
Publication Information: Journal of Molecular Evolution (ISSN 0022-2844); 19; Sept
Publisher Information: Germany
Contract/Grant/Task Num: NAGW-20
Financial Sponsor: NASA; United States
Organization Source: California Univ.; La Jolla, CA, United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABIOGENESIS; AMINO ACIDS; PRIMITIVE EARTH ATMOSPHERE; PROTEIN SYNTHESIS; PROTOBIOLOGY; ATMOSPHERIC CHEMISTRY; ATMOSPHERIC COMPOSITION; ATMOSPHERIC MODELS; ELECTRIC SPARKS; ENVIRONMENT SIMULATION; GAS MIXTURES
Imprint And Other Notes: Journal of Molecular Evolution (ISSN 0022-2844), vol. 19, Sept. 1983, p. 376-390.
Miscellaneous Notes: 1983, p. 376-390
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 17, 2011
Contact Us