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71.
In non-acclimated bean plants heat shock induced oxidative damage (increase of free radical concentration and drop of bound
thiols, indicating aggregation of proteins) which was regulated by the enhanced activities of peroxidase and superoxide dismutase,
as well as by the accumulation of polyphenols and especially of polyamines. In the plants acclimated to high temperature no
oxidative damage occurred following heat shock.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
72.
Romeo V. Yordanov 《Aquatic Ecology》1992,26(2-4):581-585
A series of laboratory experiments onGlyptotendipes salinus were carried out in order to assess cytogenetic effects of different doses of gamma-radiation on polytene chromosomes, isolated from salivary glands. Chrinonomid larvae (III–IV larval stage) were irradiated with doses varying from 0.05 to 1.00 Gy (5–100 rad) and were bred under laboratory conditions until the fourth larval stage. Cytogenetic slides were analyzed for an estimation of occurrence of changes in the organization of the polytene chromosomes caused by gamma-radiation. A specific heterochromatin effect was found in certain chromosomes of the investigated species after 1.00 Gy irradiation. Decondensation of the centromeric heterochromatin and increased functional activity of Balbiany ring 2 were observed in the fourth (G) chromosome. Regression of the nucleolus of the first (AB) chromosome was detected. 相似文献