Amino acid in Deep Sea Drilling Project cores
Several amino acid diagenetic reactions, which take place in the deep-sea sedimentary environment, were investigated, using various Deep Sea Drilling Project (DSDP) cores. Initially it was found that essentially all the amino acids in sediments are bound in peptide linkages; but, with increasing age...
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1980
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.746780 https://doi.org/10.1594/PANGAEA.746780 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.746780 2023-05-15T17:37:11+02:00 Amino acid in Deep Sea Drilling Project cores Bada, Jeffrey L Man, Eugene H MEDIAN LATITUDE: 2.209224 * MEDIAN LONGITUDE: -3.958137 * SOUTH-BOUND LATITUDE: -29.949800 * WEST-BOUND LONGITUDE: -69.364200 * NORTH-BOUND LATITUDE: 36.878700 * EAST-BOUND LONGITUDE: 123.846300 * DATE/TIME START: 1971-01-02T00:00:00 * DATE/TIME END: 1974-07-06T00:00:00 1980-10-22 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.746780 https://doi.org/10.1594/PANGAEA.746780 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.746780 https://doi.org/10.1594/PANGAEA.746780 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bada, Jeffrey L; Man, Eugene H (1980): Amino acid diagenesis in Deep Sea Drilling Project cores: Kinetics and mechanisms of some reactions and their applications in geochronology and in paleotemperature and heat flow determinations. Earth-Science Reviews, 16(1), 21-55, https://doi.org/10.1016/0012-8252(80)90003-3 15-148 15-149 25-241 25-242 25-249 27-262 37-332 37-332A 37-333 Caribbean Sea/BASIN Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//CHANNEL Indian Ocean//RIDGE Indian Ocean//TROUGH Leg15 Leg25 Leg27 Leg37 North Atlantic/VALLEY Dataset 1980 ftpangaea https://doi.org/10.1594/PANGAEA.746780 https://doi.org/10.1016/0012-8252(80)90003-3 2023-01-20T07:31:57Z Several amino acid diagenetic reactions, which take place in the deep-sea sedimentary environment, were investigated, using various Deep Sea Drilling Project (DSDP) cores. Initially it was found that essentially all the amino acids in sediments are bound in peptide linkages; but, with increasing age, the peptide bonds undergo slow hydrolysis that results in an increasingly larger fraction of amino acids in the free state. The hydrolysis half-life in calcareous sediments was estimated to be ~1–2 million years, while in non-carbonate sediment the hydrolysis rate may be considerably slower. The amino acid compositions and the extent of racemization of several amino acids were determined in various fractions isolated from the sediments. These analyses demonstrated that the mechanism, kinetics, and rate of amino acid diagenesis are highly dependent upon the physical state (i.e., free, bound, etc.) in which the amino acids exist in the sedimentary environment. In the free state, serine and threonine were found to decompose primarily by a dehydration reaction, while in the bound state (residue or HCl-insoluble fraction) a reversible aldol-cleavage reaction is the main decomposition pathway of these amino acids. The change in amino acid composition of the residue fraction with time was suggested to be due to the hydrolysis of peptide bonds, while in foraminiferal tests the compositional changes over geological time are the result of various decomposition reactions. Reversible first-order racemization kinetics are not observed for free amino acids in sediments. The explanation for these anomalous kinetics involves a complex reaction series which includes the hydrolysis of peptide bonds and the very rapid racemization of free amino acids. The racemization rates of free amino acids in sediments were found to be many orders of magnitude faster than those predicted from elevated temperature experiments using free amino acids in aqueous solution. The racemization rate enhancement of free amino acids in sediments may be due to ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(-69.364200,123.846300,36.878700,-29.949800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
15-148 15-149 25-241 25-242 25-249 27-262 37-332 37-332A 37-333 Caribbean Sea/BASIN Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//CHANNEL Indian Ocean//RIDGE Indian Ocean//TROUGH Leg15 Leg25 Leg27 Leg37 North Atlantic/VALLEY |
spellingShingle |
15-148 15-149 25-241 25-242 25-249 27-262 37-332 37-332A 37-333 Caribbean Sea/BASIN Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//CHANNEL Indian Ocean//RIDGE Indian Ocean//TROUGH Leg15 Leg25 Leg27 Leg37 North Atlantic/VALLEY Bada, Jeffrey L Man, Eugene H Amino acid in Deep Sea Drilling Project cores |
topic_facet |
15-148 15-149 25-241 25-242 25-249 27-262 37-332 37-332A 37-333 Caribbean Sea/BASIN Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//CHANNEL Indian Ocean//RIDGE Indian Ocean//TROUGH Leg15 Leg25 Leg27 Leg37 North Atlantic/VALLEY |
description |
Several amino acid diagenetic reactions, which take place in the deep-sea sedimentary environment, were investigated, using various Deep Sea Drilling Project (DSDP) cores. Initially it was found that essentially all the amino acids in sediments are bound in peptide linkages; but, with increasing age, the peptide bonds undergo slow hydrolysis that results in an increasingly larger fraction of amino acids in the free state. The hydrolysis half-life in calcareous sediments was estimated to be ~1–2 million years, while in non-carbonate sediment the hydrolysis rate may be considerably slower. The amino acid compositions and the extent of racemization of several amino acids were determined in various fractions isolated from the sediments. These analyses demonstrated that the mechanism, kinetics, and rate of amino acid diagenesis are highly dependent upon the physical state (i.e., free, bound, etc.) in which the amino acids exist in the sedimentary environment. In the free state, serine and threonine were found to decompose primarily by a dehydration reaction, while in the bound state (residue or HCl-insoluble fraction) a reversible aldol-cleavage reaction is the main decomposition pathway of these amino acids. The change in amino acid composition of the residue fraction with time was suggested to be due to the hydrolysis of peptide bonds, while in foraminiferal tests the compositional changes over geological time are the result of various decomposition reactions. Reversible first-order racemization kinetics are not observed for free amino acids in sediments. The explanation for these anomalous kinetics involves a complex reaction series which includes the hydrolysis of peptide bonds and the very rapid racemization of free amino acids. The racemization rates of free amino acids in sediments were found to be many orders of magnitude faster than those predicted from elevated temperature experiments using free amino acids in aqueous solution. The racemization rate enhancement of free amino acids in sediments may be due to ... |
format |
Dataset |
author |
Bada, Jeffrey L Man, Eugene H |
author_facet |
Bada, Jeffrey L Man, Eugene H |
author_sort |
Bada, Jeffrey L |
title |
Amino acid in Deep Sea Drilling Project cores |
title_short |
Amino acid in Deep Sea Drilling Project cores |
title_full |
Amino acid in Deep Sea Drilling Project cores |
title_fullStr |
Amino acid in Deep Sea Drilling Project cores |
title_full_unstemmed |
Amino acid in Deep Sea Drilling Project cores |
title_sort |
amino acid in deep sea drilling project cores |
publisher |
PANGAEA |
publishDate |
1980 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.746780 https://doi.org/10.1594/PANGAEA.746780 |
op_coverage |
MEDIAN LATITUDE: 2.209224 * MEDIAN LONGITUDE: -3.958137 * SOUTH-BOUND LATITUDE: -29.949800 * WEST-BOUND LONGITUDE: -69.364200 * NORTH-BOUND LATITUDE: 36.878700 * EAST-BOUND LONGITUDE: 123.846300 * DATE/TIME START: 1971-01-02T00:00:00 * DATE/TIME END: 1974-07-06T00:00:00 |
long_lat |
ENVELOPE(-69.364200,123.846300,36.878700,-29.949800) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Bada, Jeffrey L; Man, Eugene H (1980): Amino acid diagenesis in Deep Sea Drilling Project cores: Kinetics and mechanisms of some reactions and their applications in geochronology and in paleotemperature and heat flow determinations. Earth-Science Reviews, 16(1), 21-55, https://doi.org/10.1016/0012-8252(80)90003-3 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.746780 https://doi.org/10.1594/PANGAEA.746780 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.746780 https://doi.org/10.1016/0012-8252(80)90003-3 |
_version_ |
1766136966985809920 |