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1.
The results of a study of diatoms from surface sediments (0–1 cm) of Amurskiy Bay are presented for the first time. The specific composition (221 species and intraspecific taxa) and ecological structure of the diatom flora were determined. The diatom species composition of phytoplankton, periphyton, and surface sediments is compared. 相似文献
2.
A cell line resistant to 6-mercaptopurine (6-MP) is isolated from Djungarian hamster embryonic fibroblasts transformed with SV-40, 6-MP resistance is due to the absence or complete inhibition of GGPRT activity. Initial and resistant cell cultures are similar in the growth rate and in the inoculation efficiency. Caryological analysis (differential chromosome staining--S-bands) revealed considerable caryotype rearrangements in both resistant and sensitive lines as compared with Djungarian hamster normal chromosome set, and also the appearance of specific chromosome markers. 相似文献
3.
G. M. Obaturov V. V. Moiseenko A. S. Filimonov 《Radiation and environmental biophysics》1993,32(4):285-294
A systemic model describing the major radiobiological effects of various types of radiation is proposed. The model base lines were substantiated, and general mathematical equations for cell survival developed. The model takes into consideration such physical and biological factors as linear energy transfer, ion track structure, and structural and functional organization of interphase chromatin. This paper presents the basic assumptions made and general equations for the cell killing. 相似文献
4.
Begunova A. V. Savinova O. S. Moiseenko K. V. Glazunova O. A. Rozhkova I. V. Fedorova T. V. 《Applied Biochemistry and Microbiology》2021,57(4):458-467
Applied Biochemistry and Microbiology - As a natural, symbiotic consortium of bacteria and yeasts, kefir grains provide a unique source of new probiotic microorganisms. In this work, three new... 相似文献
5.
The estimation of individual variability and group dynamics of micronuclei rate in buccal cells of participants of transatlantic march of the VIIth Ukrainian Antarctic expedition (Sevastopol--UAS "Akademik Vernadsky"--Sevastopol) was carried out. The general average rate of micronuclei was 2.20 per thousand. Individual values of micronuclei frequencies varied in wide limits. The maximum value of CV was 92.4% and the minimal one was 48.4%. Individual averages of micronuclei rates varied from 1.70 to 2.78 per thousand. Dependence of individual and group dynamics of micronuclei rates on environmental factors (temperature, atmospheric pressure and storm activity) was tested. No significant correlation of these parameters was found. 相似文献
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V. V. Moiseenko R. N. Hamm A. J. Waker W. V. Prestwich 《Radiation and environmental biophysics》1998,37(3):167-172
Radiation-induced DNA single- and double-strand breaks were modeled for 660 keV photon radiation and scavenger capacity mimicking
the cellular environment. Atomistic representation of DNA in B form with a first hydration shell was utilized to model direct
and indirect damage. Monte Carlo generated electron tracks were used to model energy deposition in matter and to derive initial
spatial distributions of species which appear in the medium following radiolysis. Diffusion of species was followed with time,
and their reactions with DNA and each other were modeled in an encounter-controlled manner. Three methods to account for hydroxyl
radical diffusion in a cellular environment were tested: assumed exponential survival, time-limited modeling and modeling
of reactions between hydroxyl radicals and scavengers in an encounter-controlled manner. Although the method based on modeling
scavenging in an encounter-controlled manner is more precise, it requires substantially more computer resources than either
the exponential or time-limiting method. Scavenger concentrations of 0.5 and 0.15 M were considered using exponential and
encounter-controlled methods with reaction rate set at 3×109 dm3 mol–1 s–1. Diffusion length and strand break yields, predicted by these two methods for the same scavenger molarity, were different
by 20%–30%. The method based on limiting time of chemistry follow-up to 10–9 s leads to DNA damage and radical diffusion estimates similar to 0.5 M scavenger concentration in the other two methods.
The difference observed in predictions made by the methods considered could be tolerated in computer simulations of DNA damage.
Received: 3 June 1998 / Accepted in revised form: 16 July 1998 相似文献