Effect of γ-rays on Thymine in De-aerated Aqueous Solutions

Nature ◽  
1962 ◽  
Vol 194 (4825) ◽  
pp. 278-279 ◽  
Author(s):  
B. EKERT
Keyword(s):  
Aqueous Solutions ◽  
Γ Rays

γ-Radiolysis of disulfides in aqueous solution. III. L-Cysteine-D-penicillamine mixed disulfide

1969 ◽  
Vol 47 (6) ◽  
pp. 1037-1043 ◽  
Author(s):  
J. W. Purdie
Keyword(s):  
Aqueous Solution ◽  
Free Radicals ◽  
Aqueous Solutions ◽  
Dose Rate ◽  
Sulfonic Acids ◽  
Rate Dependent ◽  
Mixed Disulfide ◽  
Γ Rays ◽  
Symmetrical Disulfides ◽  
Symmetrical Disulfide

L-Cysteine-D-penicillamine mixed disulfide (CySSPen) was irradiated in aerated and deaerated aqueous solutions with 60Co γ-rays. G values were determined for all products identified after exposure to 10 000 rads. The major products were the sulfinic and sulfonic acids (CySO2H, CySO3H, and PenSO2H), the sulfhydryl derivatives (CySH and PenSH), symmetrical disulfides (CySSCy and PenSSPen), three trisulfides (CySSSCy, CySSSPen, and PenSSSPen), and ammonia. Each half of the disulfide behaved in exactly the same way as the corresponding symmetrical disulfide. Products from the CyS— part of the disulfide were dose rate dependent while products from the PenS— part were independent of dose rate. The reactions proposed for the symmetrical disulfides were adequate to explain radiolysis of the unsymmetrical disulfide.Radiolysis of a mixture of cystine and penicillamine disulfide was examined for comparison with the unsymmetrical disulfide and was found to give very similar results. It was concluded that the free radicals produced from the water attack each half at approximately equal rates.

REARRANGEMENT STUDIES WITH C14. X. ETHANOL-2-C14 FROM THE IRRADIATION OF ETHANOL-1-C 14 WITH Co60 GAMMA RAYS

1960 ◽  
Vol 38 (12) ◽  
pp. 2315-2318 ◽  
Author(s):  
C. C. Lee ◽  
D. G. Lee
Keyword(s):  
Aqueous Solutions ◽  
Gamma Rays ◽  
Γ Rays ◽  
G Value ◽  
Co60 Gamma

The irradiation of aqueous solutions of ethanol-1-C14, containing about 2% ethanol by weight, with up to 58.0 million rads of Co60 γ-rays led to the formation of up to 0.49% ethanol-2-C14 in the alcohol recovered after irradiation. The G value of this isotope position rearrangement was about 0.04 and amounted to approximately 2% of the G value for the total amount of ethanol decomposed. Possible mechanisms for the rearrangement are discussed.

Effects of γ-Rays on Aqueous Solutions of Synthetic Polymers

1959 ◽  
Vol 14 (4) ◽  
pp. 544-544
Author(s):  
Shintaro Sugai ◽  
Mitsuo Ishikawa ◽  
Jiro Furuichi
Keyword(s):  
Aqueous Solutions ◽  
Synthetic Polymers ◽  
Γ Rays
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