全文获取类型
收费全文 | 5021篇 |
免费 | 0篇 |
专业分类
5021篇 |
出版年
2012年 | 34篇 |
2011年 | 64篇 |
2010年 | 15篇 |
2008年 | 56篇 |
2007年 | 77篇 |
2006年 | 86篇 |
2005年 | 102篇 |
2004年 | 80篇 |
2003年 | 96篇 |
2002年 | 82篇 |
2001年 | 80篇 |
2000年 | 91篇 |
1999年 | 91篇 |
1998年 | 4篇 |
1992年 | 148篇 |
1991年 | 193篇 |
1990年 | 158篇 |
1989年 | 220篇 |
1988年 | 174篇 |
1987年 | 177篇 |
1986年 | 170篇 |
1985年 | 166篇 |
1984年 | 126篇 |
1983年 | 115篇 |
1982年 | 41篇 |
1981年 | 30篇 |
1980年 | 48篇 |
1979年 | 121篇 |
1978年 | 110篇 |
1977年 | 93篇 |
1976年 | 87篇 |
1975年 | 130篇 |
1974年 | 145篇 |
1973年 | 147篇 |
1972年 | 162篇 |
1971年 | 154篇 |
1970年 | 151篇 |
1969年 | 137篇 |
1968年 | 120篇 |
1967年 | 129篇 |
1966年 | 110篇 |
1965年 | 89篇 |
1959年 | 44篇 |
1958年 | 93篇 |
1957年 | 78篇 |
1956年 | 62篇 |
1955年 | 57篇 |
1954年 | 44篇 |
1953年 | 13篇 |
1952年 | 13篇 |
排序方式: 共有5021条查询结果,搜索用时 7 毫秒
1.
S Kh Khaduev O S Zhukova Ia V Dobrynin K Soda T T Berezov 《Biulleten' eksperimental'no? biologii i meditsiny》1986,101(5):603-604
L-lysine-alpha-oxidase, a new fungal enzyme catalyzing oxidative deamination of L-lysine, exerts an inhibitory effect on DNA, RNA and protein synthesis in human cells of carcinoma ovarius (CaOv) in vitro. 相似文献
2.
Peptide material has been first isolated from k-casein pepsin hydrolysate. Its subcutaneous injection to hungry animals induced high amplitude (250-350 mV) and high frequency (16-20 Hz) oscillations of electrical potentials usually observed in food satiety and cholecystokinin administration. The peptide reduced respiratory and to a lesser extent heart rate. Its effect is temporary eliminated by naloxone. According to an aminogram, the peptide is a fragment of para-k-casein. A neurotropic peptide effect is connected with satiety regulation and milk consumption in the postnatal period. 相似文献
3.
4.
Ia I Serkiz A I Lipskaia L B Pinchuk V V Trishin Iu F Kataevski? G N Koval' 《Radiobiologiia》1991,31(5):629-634
Irradiation conditions in which laboratory animals were kept in experimental laboratories of Chernobyl and Kiev after the accident at the Chernobyl A.P.S. are described. The data are presented on the spectral structural and activity of radionuclides in the diet as well as in the organs and tissues of the animals. The radiation loads have been estimated with regard to an external gamma component and the internal one contributed by the incorporated radionuclides. It has been shown that radiation doses received by the animals during their lifetime due to these contributions do not exceed units of cGy. 相似文献
5.
V Ia Gotlib I I Pelevina E F Konoplia A A Al'ferovich A A Konradov 《Radiobiologiia》1991,31(3):318-325
On the basis of their own data and the literature the authors have analyzed the mechanism of biological action of low-level radiation on cells. In studying the harmful effect of gamma-radiation (10-40 cGy) on HeLa cells it was shown that damages occurred in 12 postirradiation generations. Analysis of cell distribution within the colonies has demonstrated that the share of colonies with low cell content and the number of giant cell increase. These data indicate that low-level radiation causes reproductive cell death that can occur not immediately but in later generations. 相似文献
6.
The effect of UV light (lambda = 254 nm) on calf thymus DNP at low ionic strengths was studied. It was found that at the irradiation doses used the protein in the DNA-protein complex increases as the irradiation dose rises. Thermal treatment and acid hydrolysis resulted in a predominant release of histones H3 and H1 from the complex. Data from liquid high performance chromatography, amino acid analysis, thin-layer chromatography point to the induction by UV-light of a thymine-lysine bond, whose formation involves DNA thymines and histone lysine residues, predominantly H3 and H1 fractions. 相似文献
7.
Using two-dimensional thin-layer chromatography, the effect of serotonin on the yield of thymine dimers and on cleavage of the N-glycosidic bond in the DNA irradiated with ultraviolet (UV) light and X-ray was studied. Bound serotonin was shown to reduce the synthesis of UV-induced thymine dimers but had no effect on the number of X-ray-induced breaks in the N-glycoside bonds in thymidine residues. The data obtained are discussed in terms of the mechanisms of serotonin involvement in the photoprotection of yeast cells from the lethal action of UV and X-ray irradiations. 相似文献
8.
9.
M Kh Ga?nutdinov S I Mirmakhmudova N M Mullagalieva Ia Kh Turakulov 《Biulleten' eksperimental'no? biologii i meditsiny》1984,97(3):293-295
Addition of a thermostable cytoplasmic fraction leads to the uncoupling of oxidative phosphorylation of the mitochondria. In hyperthyrosis such an effect manifests itself more powerfully than in the control. Addition of the thermostable cytoplasmic fraction induces electrogenic phosphate transport via the mitochondrial membrane. In hyperthyrosis, the activity of the thermostable inducer of phosphate transport in the cytoplasm increases. The functioning of the phosphate cycle may be the cause of the uncoupling of oxidative phosphorylation of the mitochondria during the disease in question. 相似文献
10.