Liehen substances. IV. Incorporation of pulvinic-14C acids into calycin by the lichen Pseudocyphellaria crocata

1970 ◽  
Vol 48 (11) ◽  
pp. 1241-1248 ◽  
Author(s):  
W. S. G. Maass
Keyword(s):  
Radioactive Carbon ◽  
Acetone Insoluble

Pulvinic-14C acid, vulpinic-14C acid, and ethyl pulvinate-14C were found to be good precursors of calycin but not of pulvinic dilactone or of pulvinic acid normally present in Ps. crocata. Some of the labeled precursor became bound in acetone-insoluble materials before the radioactive carbon began to accumulate in calycin. Calycin probably arises by hydroxylation of a bound form of pulvinic acid.

scholarly journals STUDIES IN PROTEIN METABOLISM WITH COMPOUNDS LABELED WITH RADIOACTIVE CARBON

1948 ◽  
Vol 173 (1) ◽  
pp. 189-197 ◽  
Author(s):  
Theodore Winnick ◽  
Felix Friedberg ◽  
David M. Greenberg
Keyword(s):  
Protein Metabolism ◽  
Radioactive Carbon

scholarly journals BIOSYNTHESIS OF URIC ACID LABELED WITH RADIOACTIVE CARBON

1949 ◽  
Vol 177 (2) ◽  
pp. 597-599 ◽  
Author(s):  
J.L. Karlsson ◽  
H.A. Barker
Keyword(s):  
Uric Acid ◽  
Radioactive Carbon

PREPARATION OF 1-C14 PENTONIC ACIDS BY THE CYANHYDRIN SYNTHESIS

1954 ◽  
Vol 32 (4) ◽  
pp. 334-339 ◽  
Author(s):  
A. C. Neish
Keyword(s):  
Equimolar Amount ◽  
Radioactive Carbon ◽  
Xylonic Acid

Solutions of pure D-threose and D-erythrose, buffered with bicarbonate (0.82 moles) plus carbonate (0.18 moles), were treated with an equimolar amount of C14-labeled KCN. The aldonic acids were isolated as salts, using carrier technique, in yields of 90–95% based on the radioactive carbon. D-Erythrose gave 1.89 times as much arabonic as ribonic acid while D-threose gave 2.36 times as much lyxonic as xylonic acid. Despite the unfavorable ratio in the latter case it was found that D-xylose could be obtained in an over-all yield of 22%, based on the cyanide.

scholarly journals METABOLISM OF LACTIC ACID CONTAINING RADIOACTIVE CARBON IN THE α OR β POSITION

1942 ◽  
Vol 142 (1) ◽  
pp. 371-377 ◽  
Author(s):  
Birgit Vennesland ◽  
A.K. Solomon ◽  
John M. Buchanan ◽  
Richard D. Cramer ◽  
A. Baird Hastings
Keyword(s):  
Lactic Acid ◽  
Radioactive Carbon

scholarly journals BEHAVIOR OF CARBON AND URANIUM AT RADIOACTIVE GRAPHITE HEATING IN WATER VAPOR. THERMODYNAMIC MODELING

2018 ◽  
Vol 59 (9) ◽  
pp. 16 ◽  
Author(s):  
Nikolaiy M. Barbin ◽  
Anton M. Kobelev ◽  
Dmiriy I. Terent’ev ◽  
Sergeiy G. Alexeev
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Thermodynamic Modeling ◽  
Radioactive Carbon ◽  
Radioactive Graphite

The behavior of radioactive graphite was studied by the method of thermodynamic modeling at high temperature in water vapor. The distribution of radioactive carbon and uranium on phase states is given.

COMPETITION BETWEEN AMINO ACIDS FOR TRANSPORT INTO EHRLICH ASCITES CARCINOMA CELLS

1961 ◽  
Vol 39 (11) ◽  
pp. 1717-1735 ◽  
Author(s):  
P. G. Scholefield
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Amino Acid ◽  
Ehrlich Ascites Carcinoma ◽  
Carcinoma Cells ◽  
Transport Systems ◽  
Radioactive Carbon ◽  
Ehrlich Ascites ◽  
Competitive Inhibitors ◽  
Amino Acid Analogues

The cumulative entry of amino acids into Ehrlich ascites carcinoma cells is due to the presence of active transport systems, each with its own specific range of substrates. Several amino acids and amino acid analogues may have an affinity for the same transport system and thus may inhibit transport of other amino acids by acting as competitive inhibitors or competitive substrates. Loss of methionine from ascites cells takes place by a diffusion process which obeys Fick's law. Leucine accumulation by ascites cells is small and is increased on addition of certain other amino acids. The increase is not due to inhibition of leucine oxidation as increase in the rate of production of radioactive carbon dioxide from labeled leucine also occurs. Kinetic aspects of these results are discussed.

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