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PubMedDate not supplied

[Characteristics of the development of interphase death of hematopoietic tissue in dogs in response to gamma irradiation].

In experiments with 2-3 week dogs it was shown that whole-body gamma-irradiation with a dose of 3 Gy causes an insignificant absolute rise in the amount of degrading chromatin of the haemopoietic organs during the first 24 h following irradiation. After 48 h, this cell death parameter is normalized. A considerably lower radiosensitivity of lymphoid cells of dogs compared to small laboratory animals is indicated by a stable DNA content per 1 g of thymus, intactness of its structure after irradiation, and the absence of an increase in thymidine content of blood of young and adult dogs under the effect of 3-3.7 Gy radiation.

Animals↗
PubMedDate not supplied

[Mathematical model of interphase cell death].

A model of radiation injury of cells is proposed. It involves a diffusion description of the distribution of elementary lesions among cells during irradiation. It is assumed that the probability of cell death depends on the number of elementary lesions. This probability is described by the model of nonspecific radiation response of cells. The survival function is found for a particular case of the dependence of cell death probability on the number of elementary lesions. The asymptotes of this function are obtained for low and high radiation doses. A qualitative comparison with the experimental data is presented.

Animals↗
PubMed1985

[Centrioles and microtubules in interphase cells exposed to colcemid. The concentration- and time-dependent effect of the action of the poison].

Under the action of colcemid on SPEV cells the network of cytoplasmic microtubules disappears within less than 1 hour; microtubules attached to pericentriolar satellites are retained for 4 hours. The disassembly time of these microtubules does not depend on colcemide concentration. It is therefore assumed that most of the microtubules are not attached to the centrioles, but have two free ends, thus confirming a hypothesis that they are conveyer-assembled. With colcemid concentration equal to 0.5 mcg/ml, the following dynamics of events is observed for the cell centre: after the microtubules attached to the satellites had disappeared, clusters of electron dense material appear around the centrioles (6 hour incubation), then short microtubules occur among clusters (8 hour incubation) to be subsequently retained (up to 40 hour incubation).

Animals↗
PubMed1985

Meiosis II, mitosis I and the linking interphase: a study of the cytoskeleton in the fertilised mouse egg.

Data concerning the organisation and the role of microtubules and microfilaments during the 20 h following fertilisation in vitro of the mouse oocyte is reviewed. This period covers the fertilisation-induced completion of meiosis, from second meiotic metaphase through the first mitotic cell cycle, and involves the union of the haploid parental genomes. Various antibodies were used against actin, tubulin and PCM to describe the localisation of the cytoskeletal components and the two cytoskeleton-disrupting drugs nocodazole and CCD to assess the functional importance of the cytoskeleton.

Animals↗
PubMed1979

Changes in the activity of RNA polymerase detected in situ and the intensity of 3H uridine incorporation into the nucleolus and the nucleus of interphase cells in antheridial filaments of Chara vulgaris L.

Analogously as in the 32-cell stage [20], in the 4-, and 8-cell generations of antheridial filaments of Chara vulgaris, the activity of DNA dependent RNA polymerase detected in situ as well as the 3H uridine incorporation increase in the middle S phase and in the middle G2 phase, while they decrease considerably at the end of S phase and in late G2 phase. The diphasic changes occur both in the nucleolar and extranucleolar (nucleoplasmic) activity of RNA polymerase as well as in the 3H uridine incorporation. However, the maximum nucleolar activity, in both S and G2 phases, precedes the peak of nucleoplasmic activity. During the increased nucleolar activity RNA polymerase (as calculated per nucleus) shows a higher level as compared with nucleoplasmic RNA polymerase, whereas the intensity of 3H uridine incorporation into nucleous and nucleoplasm is similar. It may be supposed that the incubation environment containing Mg2+ used in vitro is more stimulating for the nucleolar RNA polymerase than for the nucleoplasmic RNA polymerase. The mean transcriptional activity of the nucleus and the activity of RNA polymerase in the 8-cell generation is about 20% lower than in the 4-cell generation, in proportion to the decrease in cell sizes.

Cell Cycle↗