Radiolabelled amino acids: Synthesis of NG-mesitylenesulfonyl-N2-[3H]methyl-arginine

1993 ◽  
Vol 33 (9) ◽  
pp. 863-868 ◽  
Author(s):  
Scott W. Landvatter
Keyword(s):  
Amino Acids ◽  
Radiolabelled Amino Acids

The incorporation and turnover of radiolabelled amino acids in developing stereocilia of the chick cochlea

1996 ◽  
Vol 101 (1-2) ◽  
pp. 45-54 ◽  
Author(s):  
J.O. Pickles ◽  
D.A. Billieux-Hawkins ◽  
G.W. Rouse
Keyword(s):  
Amino Acids ◽  
Radiolabelled Amino Acids

scholarly journals Sexual cannibalism increases male material investment in offspring: quantifying terminal reproductive effort in a praying mantis

2016 ◽  
Vol 283 (1833) ◽  
pp. 20160656 ◽  
Author(s):  
William D. Brown ◽  
Katherine L. Barry
Keyword(s):  
Amino Acids ◽  
Reproductive Effort ◽  
Sexual Cannibalism ◽  
Male Body ◽  
Praying Mantis ◽  
Substantial Investment ◽  
Praying Mantid ◽  
Males And Females ◽  
The Cost ◽  
Radiolabelled Amino Acids

Models of the evolution of sexual cannibalism argue that males may offset the cost of cannibalism if components of the male body are directly allocated to the eggs that they fertilize. We tested this idea in the praying mantid Tenodera sinensis . Males and females were fed differently radiolabelled crickets and allowed to mate. Half of the pairs progressed to sexual cannibalism and we prevented cannibalism in the other half. We assess the relative allocation of both male-derived somatic materials and ejaculate materials into the eggs and soma of the female. Our results show that male somatic investment contributes to production of offspring. The eggs and reproductive tissues of cannibalistic females contained significantly more male-derived amino acids than those of non-cannibalistic females, and there was an increase in the number of eggs produced subsequent to sexual cannibalism. Sexual cannibalism thus increases male material investment in offspring. We also show that males provide substantial investment via the ejaculate, with males passing about 25% of their radiolabelled amino acids to females via the ejaculate even in the absence of cannibalism.

Incorporation of radiolabelled amino acids into the sulphur-containing metabolites of paracetamol by the hamster

Xenobiotica ◽  
1985 ◽  
Vol 15 (11) ◽  
pp. 891-897 ◽  
Author(s):  
A. Warrander ◽  
J. M. Allen ◽  
R. S. Andrews
Keyword(s):  
Amino Acids ◽  
Radiolabelled Amino Acids

Homochirality as the Signature of Extra-Terrestrial Life

1997 ◽  
Vol 161 ◽  
pp. 505-510
Author(s):  
Alexandra J. MacDermott ◽  
Laurence D. Barron ◽  
Andrè Brack ◽  
Thomas Buhse ◽  
John R. Cronin ◽  
...  
Keyword(s):  
Amino Acids ◽  
Protein Synthesis ◽  
Optical Rotation ◽  
Physical Origin ◽  
Natural Choice ◽  
Rosetta Mission ◽  
Terrestrial Life ◽  
Subsurface Layers ◽  
Solar System Bodies ◽  
Origin Of Homochirality

AbstractThe most characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. We therefore suggest that a search for extra-terrestrial life can be approached as a Search for Extra- Terrestrial Homochirality (SETH). The natural choice for a SETH instrument is optical rotation, and we describe a novel miniaturized space polarimeter, called the SETH Cigar, which could be used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. We believe that homochirality may be found in the subsurface layers on Mars as a relic of extinct life, and on other solar system bodies as a sign of advanced pre-biotic chemistry. We discuss the chiral GC-MS planned for the Roland lander of the Rosetta mission to a comet and conclude with theories of the physical origin of homochirality.

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