Low-latitude glacial cooling in the Southern Hemisphere from amino-acid racemization in emu eggshells

Nature ◽  
1997 ◽  
Vol 385 (6613) ◽  
pp. 241-244 ◽  
Author(s):  
Gifford H. Miller ◽  
John W. Magee ◽  
A. J. T. Jull
Keyword(s):  
Amino Acid ◽  
Southern Hemisphere ◽  
Low Latitude ◽  
Amino Acid Racemization

scholarly journals A new method for enamel amino acid racemization dating: A closed system approach

2019 ◽  
Vol 50 ◽  
pp. 29-46 ◽  
Author(s):  
Marc R. Dickinson ◽  
Adrian M. Lister ◽  
Kirsty E.H. Penkman
Keyword(s):  
Amino Acid ◽  
Closed System ◽  
System Approach ◽  
New Method ◽  
Amino Acid Racemization

scholarly journals Effect of acid hydrolysis on the racemization method using amino acid racemization in teeth.

1988 ◽  
Vol 37 (9) ◽  
pp. 476-480 ◽  
Author(s):  
Tsuneko OGINO ◽  
Hideki OGIUCHI ◽  
Toshiyuki HOBO ◽  
Hiroshi OGINO
Keyword(s):  
Amino Acid ◽  
Acid Hydrolysis ◽  
Amino Acid Racemization

scholarly journals Quasi-biennial and quasi-triennial oscillations in the growth rates of atmospheric chlorofluorocarbons 11 and 12

MAUSAM ◽  
2022 ◽  
Vol 53 (3) ◽  
pp. 349-358
Author(s):  
R. P. KANE
Keyword(s):  
Southern Hemisphere ◽  
Growth Rates ◽  
Southern Oscillation ◽  
Spectral Characteristics ◽  
Linear Increase ◽  
Transport Processes ◽  
Emission Rates ◽  
Low Latitude ◽  
The Difference ◽  
Prominent Peak

The 12-monthly running means of CFC-11 and CFC-12 were examined for 1977-1992. As observed by earlier workers, during 1977-1988, there was a rapid, almost linear increase of these compounds, ~70% in the northern and ~77% in the southern hemisphere. From 1988 up to 1992, growth rates were slower, more so for CFC-11 in the northern hemisphere. Superposed on this pattern were QBO, QTO (Quasi-Biennial and Quasi-Triennial Oscillations). A spectral analysis of the various series indicated the following. The 50 hPa low latitude zonal wind had one prominent QBO peak at 2.58 years and much smaller peaks at 2.00 (QBO) and 5.1 years. The Southern oscillation index represented by (T-D), Tahiti minus Darwin atmospheric pressure, had a prominent peak at 4.1 years and a smaller peak at 2.31 years. CFC-11 had only one significant peak at 3.7 years in the southern hemisphere, roughly similar to the 4.1 year (T-D) peak. CFC-12 had prominent QBO (2.16-2.33 years) in both the hemispheres and a QTO (3.6 years) in the southern hemisphere. For individual locations, CFC-11 showed barely significant QBO in the range (1.95-3.07 years), while CFC 12 showed strong QBO in the range (1.86-2.38 years). The difference in the spectral characteristics of CFC-11 and CFC 12 time series is attributed to differences in their lifetimes (44 and 180 years), source emission rates and transport processes.

Mechanism of pyridoxal phosphate-dependent enzymatic amino-acid racemization

1983 ◽  
pp. 82 ◽  
Author(s):  
Shu-jane Shen ◽  
Heinz G. Floss ◽  
Hidehiko Kumagai ◽  
Hideaki Yamada ◽  
Nobuyoshi Esaki Kenji Soda ◽  
...  
Keyword(s):  
Amino Acid ◽  
Pyridoxal Phosphate ◽  
Amino Acid Racemization
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