Ⅰ. INTRODUCTIONPhotolysis and radiolysis of Ⅰ<sup>-</sup>and other halide ion Ⅹ<sup>-</sup>have been Studied extensively. However, only two transient absorption maxima at 390 nm and 290 nm w...Ⅰ. INTRODUCTIONPhotolysis and radiolysis of Ⅰ<sup>-</sup>and other halide ion Ⅹ<sup>-</sup>have been Studied extensively. However, only two transient absorption maxima at 390 nm and 290 nm were observed and attributed to Ⅰ<sub>2</sub> and Ⅰ<sub>3</sub><sup>-</sup> respectively, the mechanism of which was suggested展开更多
The laser photochemistry and photosensitization of DNA bases were carried out by using a nanosecond kinetic spectroscopy. A novel triplet state of thymine and its OH adduct were observed in N_2 and N_2O saturated aque...The laser photochemistry and photosensitization of DNA bases were carried out by using a nanosecond kinetic spectroscopy. A novel triplet state of thymine and its OH adduct were observed in N_2 and N_2O saturated aqueous solution respectively. The transient absorption spectra of triplet cytosine, cytidine and deoxycytidine monophosphoric acid were observed for the first time. Triplet guanosine was confirmed and its pK, value, 8.7, was obtained. Kinetic studies of the growth-decay of the above transient species were performed and their reaction mechanisms were elucidated in detail.展开更多
Ⅰ. INTRODUCTION It is generally acknowledged that thymine dimerization in the radiation damages of DNA is related directly to the carcinogensis. For this reason, studies on the stable and unstable products in photo a...Ⅰ. INTRODUCTION It is generally acknowledged that thymine dimerization in the radiation damages of DNA is related directly to the carcinogensis. For this reason, studies on the stable and unstable products in photo and radiation reactions of thymine have been carried out extensively. But the direct observations on triplet thymine were usually made by展开更多
文摘Ⅰ. INTRODUCTIONPhotolysis and radiolysis of Ⅰ<sup>-</sup>and other halide ion Ⅹ<sup>-</sup>have been Studied extensively. However, only two transient absorption maxima at 390 nm and 290 nm were observed and attributed to Ⅰ<sub>2</sub> and Ⅰ<sub>3</sub><sup>-</sup> respectively, the mechanism of which was suggested
基金Project supported by the National Natural Science Foundation of China.
文摘The laser photochemistry and photosensitization of DNA bases were carried out by using a nanosecond kinetic spectroscopy. A novel triplet state of thymine and its OH adduct were observed in N_2 and N_2O saturated aqueous solution respectively. The transient absorption spectra of triplet cytosine, cytidine and deoxycytidine monophosphoric acid were observed for the first time. Triplet guanosine was confirmed and its pK, value, 8.7, was obtained. Kinetic studies of the growth-decay of the above transient species were performed and their reaction mechanisms were elucidated in detail.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION It is generally acknowledged that thymine dimerization in the radiation damages of DNA is related directly to the carcinogensis. For this reason, studies on the stable and unstable products in photo and radiation reactions of thymine have been carried out extensively. But the direct observations on triplet thymine were usually made by
