全文获取类型
收费全文 | 264303篇 |
免费 | 21474篇 |
国内免费 | 81篇 |
专业分类
285858篇 |
出版年
2018年 | 2845篇 |
2017年 | 2686篇 |
2016年 | 3545篇 |
2015年 | 3676篇 |
2014年 | 4741篇 |
2013年 | 6731篇 |
2012年 | 7532篇 |
2011年 | 8072篇 |
2010年 | 5742篇 |
2009年 | 5102篇 |
2008年 | 7340篇 |
2007年 | 7574篇 |
2006年 | 7138篇 |
2005年 | 6747篇 |
2004年 | 6841篇 |
2003年 | 6642篇 |
2002年 | 6525篇 |
2001年 | 12091篇 |
2000年 | 12059篇 |
1999年 | 9043篇 |
1998年 | 2904篇 |
1997年 | 2969篇 |
1996年 | 2636篇 |
1995年 | 2441篇 |
1992年 | 7309篇 |
1991年 | 7433篇 |
1990年 | 7220篇 |
1989年 | 6992篇 |
1988年 | 6512篇 |
1987年 | 6183篇 |
1986年 | 5681篇 |
1985年 | 5836篇 |
1984年 | 4694篇 |
1983年 | 4043篇 |
1982年 | 2775篇 |
1981年 | 2529篇 |
1980年 | 2436篇 |
1979年 | 4492篇 |
1978年 | 3550篇 |
1977年 | 3189篇 |
1976年 | 2988篇 |
1975年 | 3603篇 |
1974年 | 4016篇 |
1973年 | 4010篇 |
1972年 | 3709篇 |
1971年 | 3360篇 |
1970年 | 2949篇 |
1969年 | 2907篇 |
1968年 | 2668篇 |
1967年 | 2500篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
902.
Kh S Khamitov E I Bogdanov F A Khabirov V Z Khamidullina 《Biulleten' eksperimental'no? biologii i meditsiny》1983,96(11):24-26
Experiments with 22 rats have shown that the anterior tibial muscle in the stage of incomplete reinnervation is marked by decreased force and retardation of the semi-relaxation of an isometric contraction. In completely reinnervated muscles, the changes in the contractility are determined by the degree of nerve damage. The group of animals with the sciatic nerve injury demonstrated the contractility characteristic of a slower muscle, in contrast to the group with the fibular nerve damage. 相似文献
903.
L V Filev V G Popov I V Volchek S F Enokhin Iu V Medvedev 《Zhurnal mikrobiologii, epidemiologii, i immunobiologii》1985,(11):72-76
The influence of interlok, biotop and remantadine on the functional activity of monocytes was determined with the use of the NBT test permitting the quantitative evaluation of this characteristic. In this study interlok was found to give promising results in the treatment of acute viral hepatitis, due both to its antiviral action and to the stimulation of the functional activity of monocytes. biotop proved to render a sharply pronounced stimulating effect on the functional activity of monocytes, thus enhancing antiviral resistance. Remantadine suppressed the functional activity of monocytes and increased their lesion by the virus, thus creating favorable conditions for virus persistence in monocytes. 相似文献
904.
G Iu Miterev G F Burova M S Puzhitskaia S V Danilevich T I Bulycheva 《Biulleten' eksperimental'no? biologii i meditsiny》1987,103(6):710-712
Two hybridomas secreting mouse cytotoxic monoclonal antibodies to in vivo and in vitro activated human T-lymphocyte and neutrophil surface membrane antigenic determinants have been produced. One of these monoclonal antibodies (Ta/H-2) appeared to be also specifically reactive to blast cells in the majority of non-T-non-B and T acute lymphoblastic leukemia patients. 相似文献
905.
Low-density lipoproteins (density = 1.019-1.063 g/ml) were isolated in 10 subjects with type V hyperlipoproteinemia by ultracentrifugation in a zonal rotor under rate flotation conditions. Plasma LDL concentrations in these patients were extremely reduced, as well as being heterogeneous, and two different subclasses consisting of LDL2 (density = 1.019-1.045 g/ml) and LDL3 (density = 1.045-1.063 g/ml) were observed. LDL2 and LDL3 have similar electrophoretic mobilities in beta position in agarose gel, and their diameters, calculated from gel filtration studies, were inversely proportional to their densities. LDL2 and LDL3 have a mean hydrated density of 1.034 and 1.054 g/ml, respectively. In comparison with normal LDL2, the LDL2 and LDL3 of hypertriglyceridemic subjects are particularly rich in triacylglycerols and poor in cholesteryl esters and free cholesterol, while they have an increasing amount of proteins. The protein moiety is composed almost exclusively of apolipoprotein B-100 in IDL, LDL2 and LDL3 ; in addition, IDL also contain apolipoprotein C peptides. This characterization of LDL heterogeneity in type V hyperlipoproteinemia should be considered in interpreting kinetic data in human normal and pathological lipid metabolism and in evaluating the atherogenic risk of hypertriglyceridemia. 相似文献
906.
907.
908.
909.
In view of the importance of impedance plethysmography requirements are formulated for a modern impedance measuring device basing on a long experience with this method of measurement. The principle mode of action of the measuring equipment and the pneumatics with the timing element are described. A number of recordings is shown to illustrate the universality of the measuring equipment. 相似文献
910.