光卟啉(YHPD)光敏作用机理的探讨

本文用近代ESR技术,探讨了YHPD光敏反应的特征,结果指出:(1)YHPD不仅有产生~1O_2的作用,而且还产生了自由基(O_2·OH及YHPD);(2)产生~1O_2的能力,YHPDBHPD,这表明,其一,YHPD并非单—~1O_2起作用,而且尚与自由基(O_2,·OH,YHPD)的作用有关;其二,YHPD的光敏损伤作用虽优于BHPD,但这与它们的~1O_2产额成负相关性,而却与O_2和·OH的产额成正相关性,由该特征判别,对YHPD的光敏损伤,起主要作用的瞬态活性质,看来是活性氧自由基(O_2,·OH),而不是~O_2。     

INQUIRY OF PHOTOSENSITIZATION MECHANISM OF YANGZHOU HEMATOPORPHYRIN DERIVATIVE(YHPD)

By the use of the advanced ESR technique and through comparing with BHPD, the characteristic of YHPD photosensitization is discussed in this paper in the respect of the primary process of photosensitization. The experiment results showed: (ⅰ) not only ~1O_2, but also free radicals(O_2· OH and YHPD)can be formed by the aid of YHPD; and (ⅱ) as to the ability of producing ~1O_2, YHPDBHPD. Two points are indicated: first, the photosensitized damage of YHPD is interrelated to not only ~1O_2, but also free radicals (O_2. OH and YHPD); second, although the photosensitized damage of YHPD is stronger than that of BHPD, yet the photosensitized damage is negatively correlated to the yield of ~1O_2 but positively correlated to those of O_2 and OH. Based on these two points, it is suggested that activated oxygen free radicals(O_2 and. OH) instead of ~1O_2 play the main role as instantaneously activated material in the photosensitized damage of YHPD.     

碳酸盐沉积物的ESR断代

本文用ESR断代法测定某些碳酸盐沉积物的年代,其结果与¹⁴法符合得很好。对影响ESR断代法测定精度的一些因素进行了详细的讨论,如样品的处理、ESR测量、数据处理,年剂量和总累积剂量的测定。