Amino Acid Dating
Marine Sediments - Dating by Racemization of Amino Acids | Bada, Jeffrey
24 Jan Among the wide range of applications of amino acid geochronology, this technique is especially well suited for dating deep-sea sediments using foraminifera. The extent of amino acid racemization in fossil foraminifera has also been used to estimate the ages of Quaternary marine sediment (Müller ;. Marine Sediments: Dating by the Racemization of Amino Acids. Abstract. Isoleucine has been found to undergo a slow racemization reaction in a 5-meter sediment core taken from the Atlantis fracture zone (water depth,. meters; actual location, 'N, 43?'W). The amount of racemiza- tion increases with. 12 Aug 8 Apr The PLOS ONE Staff () Correction: Abiotic Racemization Kinetics of Amino Acids in Marine Sediments. . Wet sediment (2 g) was dispensed into 5-ml gastight glass vials, which were subsequently purged with N 2 and stored at 4°C. Based on 14C dating of the deeper sediment (J. B.
The "moving wall" represents the time period between the last issue available in JSTOR and the most recently published issue of a journal.
Limnology and Oceanography Quaternary Geochronology3 4— In contrast to the total amino acids, the free amino acids in these samples are more extensively racemized, probably as a result of various catalytic and hydrolytic reactions.
Moving walls are generally represented in years. In rare instances, a publisher has elected to have a "zero" moving wall, so their current issues are available in JSTOR shortly after publication.
Journals that are combined with another title. For racemization reactions, the frequency factor is essentially a scaling constant. Racemization half-life the amount of time required for a mixture to proceed halfway to racemic equilibrium is calculated as 3 . These results can be used in conjunction with measurements of sediment age to predict the ratio of d:
In calculating the moving wall, the current year is not counted. For example, if the current year is and a journal has a 5 year moving wall, articles from the year are available.
Individual access options are not available for this item, but you may be able to access it through one of over 11, institutions that subscribe to JSTOR. Login Through Your Library. Login to My Account Register.
American Association for the Advancement of Science. You can always find the topics here!
Were these topics helpful? Select the topics that are inaccurate. Export Citation Export to RefWorks. Export a Text file For BibTex.
Racemization of Chiral Carbonyl Compounds
Always review your references and make any necessary corrections before using. Pay attention to names, capitalization, and dates.
Sciencefounded by Thomas A. Edison in and published by AAAS, today ranks as the world's largest circulation general science journal. Published 51 times a year, Science is renowned for its highly cited, peer-reviewed research papers, its special strength in life science disciplines, and its award-winning coverage of breaking science news.
Marine sediments: dating by the racemization of amino acids. - PubMed - NCBI
The online edition includes not only the full text of current issues, but also Science archives dating back to Edison's first edition in Science Careers, found in print and online, provides relevant career articles published weekly, thousands of job postings updated several times a week, and other career related services.
The online Science Multimedia Center features Science Podcasts, images and slide shows, videos, seminars, and other interactive features.