## Abstract The percentage of orotic acid, sensitive to ultraviolet light, has been found to depend on the concentration of oxygen in solution. Diminishing this concentration by bubbling through nitrogen or hydrogen, the sensitivity increases from 14 % to 37 %. Saturation of the solution with oxyge
The effect of U.V.-light on some components of the nucleic acids. V. Reversibility of “the first irreversible reaction” under special conditions
✍ Scribed by R. Beukers; J. Ijlstra; W. Berends
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 197 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0165-0513
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✦ Synopsis
Abstract
The extent to which the extinction of thymine and orotic acid decreases on irradiation by U.V. light depends on the environmental conditions. Successive irradiations in different milieus ultimately lead to a degree of conversion which is wholly determined by the conditions during the last irradiation. Consequently it is possible to revert the substances that seem to have disappeared to the original products.
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## Abstract The rapid decrease in extinction of deoxyribonucleic acid in the first moments of irradiation with U.V. light (2537 Å) is due to the conversion of the pyrimidines into low‐absorbing substances. Thymine in this natural polymer reacts according to the so‐called “first irreversible reactio
## Abstract Apurinic acid, prepared from deoxyribonucleic acid, is destroyed by ultraviolet light much more rapidly than would be expected from the behaviour of the component pyrimidine‐nucleotides under this radiation. It is confirmed by analysis that both thymine and cytosine are sensitive. The