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Amino Acid Racemization and the Preservation of Ancient DNA
In samples in which the D/L ratio of aspartic acid exceeds 0.08, ancient DNA sequences could not be retrieved and Paleontological finds from which DNA sequences purportedly millions of years old show extensive racemization, and the amino acids present are mainly contaminates. Expand
Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization
A total of 48 eye globes were collected and analyzed to estimate ages of bowhead whales using the aspartic acid racemization technique, and growth appears faster for females than males, and age at sexual maturity occurs at around 25 years of age. Expand
The fluorescence of dissolved organic matter in seawater
A total of 28 vertical profiles of seawater fluorescence was measured in the Sargasso Sea, the Straits of Florida, the Southern California Borderlands, and the central Pacific Ocean. In all cases,Expand
The effect of ionizing radiation on the preservation of amino acids on Mars
Amino acids are excellent biomarkers in the search for life on Mars because they are essential for biology as we know it and they are robust enough to survive for billions of years in the cold andExpand
Impact melting of frozen oceans on the early Earth: Implications for the origin of life
  • J. Bada, C. Bigham, S. Miller
  • Environmental Science, Medicine
  • Proceedings of the National Academy of Sciences…
  • 15 February 1994
It is shown that bolide impacts between about 3.6 and 4.0 billion years ago could have episodically melted an ice-covered early ocean and could have been important for the initiation of abiotic reactions that gave rise to the first living organisms. Expand
Extraterrestrial Organic Compounds in Meteorites
Many organic compounds or their precursorsfound in meteorites originated in the interstellar or circumstellarmedium and were later incorporated intoplanetesimals during the formation of thesolarExpand
Extraterrestrial amino acids in Orgueil and Ivuna: Tracing the parent body of CI type carbonaceous chondrites
Carbon isotopic measurements of β-alanine and glycine and the presence of racemic (D/L ≈ 1) alanine and β-ABA in Orgueil suggest that these amino acids are extraterrestrial in origin. Expand
Determination of alpha-dialkylamino acids and their enantiomers in geological samples by high-performance liquid chromatography after derivatization with a chiral adduct of o-phthaldialdehyde.
  • M. Zhao, J. Bada
  • Chemistry, Medicine
  • Journal of chromatography. A
  • 20 January 1995
The OPA-NAC technique was optimized for the detection and enantiomeric resolution of alpha-dialkylamino acids in geological samples which contain a large excess of protein amino acids. Expand
Aspartic acid racemisation in the human lens during ageing and in cataract formation
Results are reported here the results of D/L enantiomeric analyses of normal human lenses and cataracts: aspartic acid racemisation was seen during ageing andCataract formation. Expand
How life began on Earth: a status report
  • J. Bada
  • Geology, Psychology
  • 30 September 2004
There are two fundamental requirements for life as we know it, liquid water and organic polymers, such as nucleic acids and proteins. Water provides the medium for chemical reactions and the polymersExpand