全文获取类型
收费全文 | 6856篇 |
免费 | 348篇 |
国内免费 | 1篇 |
出版年
2022年 | 24篇 |
2021年 | 52篇 |
2020年 | 27篇 |
2019年 | 33篇 |
2018年 | 57篇 |
2017年 | 67篇 |
2016年 | 104篇 |
2015年 | 159篇 |
2014年 | 169篇 |
2013年 | 603篇 |
2012年 | 328篇 |
2011年 | 367篇 |
2010年 | 226篇 |
2009年 | 218篇 |
2008年 | 352篇 |
2007年 | 380篇 |
2006年 | 361篇 |
2005年 | 394篇 |
2004年 | 402篇 |
2003年 | 337篇 |
2002年 | 367篇 |
2001年 | 140篇 |
2000年 | 135篇 |
1999年 | 126篇 |
1998年 | 90篇 |
1997年 | 99篇 |
1996年 | 57篇 |
1995年 | 57篇 |
1994年 | 70篇 |
1993年 | 72篇 |
1992年 | 110篇 |
1991年 | 89篇 |
1990年 | 79篇 |
1989年 | 82篇 |
1988年 | 109篇 |
1987年 | 76篇 |
1986年 | 68篇 |
1985年 | 61篇 |
1984年 | 70篇 |
1983年 | 53篇 |
1982年 | 61篇 |
1981年 | 57篇 |
1980年 | 54篇 |
1979年 | 43篇 |
1978年 | 48篇 |
1977年 | 29篇 |
1976年 | 36篇 |
1975年 | 31篇 |
1974年 | 32篇 |
1973年 | 36篇 |
排序方式: 共有7205条查询结果,搜索用时 15 毫秒
1.
Kazuo Seta Mitsunori Washitake Toshio Anmo 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》1980,181(3-4)
A 100-μl urine sample was chromatographed on a column packed with a strongly basic macroreticular anion-exchange resin (Diaion CDR-10, 5– μm diameter with a nominal 35% cross linkage). The elution was performed with a linear acetate gradient from 0 to 6.0 M at an average flow-rate of 0.72 ml/min and at an average pressure of 104 kg/cm2. The relative standard deviation of retention times and peak height was ± 4% or less. The properties of the macroreticular anion-exchange resin, the effect of the particle size, the pH of acetate buffers, and the effect of the flow-rate of the eluent on the separation were investigated. Thirty three components of urine were then resolved and named. 相似文献
2.
Synthesis of cytochrome c oxidase in the liver of Rana catesbeiana tadpole treated with griseofulvin
The effect of griseofulvin treatment on the synthesis of cytochrome c oxidase was studied with the liver of the tadpole, Rana catesbeiana. (1) In the liver of tadpole treated with griseofulvin, a ferrochelatase inhibitor, the synthesis of heme a, but not cytochrome c oxidase protein, is inhibited. (2) The apocytochrome c oxidase which is formed in the liver of tadpole treated with griseofulvin is converted to the active holoenzyme by exogenously added heme a. 相似文献
3.
4.
Bacteriocin sensitivity typing according to the method of Traub (Appl. Microbiol. 1971. 21: 837-840) was carried out on 226 clinical isolates of Serratia marcescens obtained from inpatients at Nagasaki University Hospital during the period from January 1976 to December 1978. The isolates were divided into 16 different bacteriocin types, mainly 26, 4, and 9. The distribution of the types suggests that Serratia marcescens infections may be caused by cross infection. Reproducibility of bacteriocin typing and the relationship between serotypes (O-antigen) and bacteriocin types are discussed in regard to the application of this method to the study of nosocomial infections. 相似文献
5.
6.
When pregnant mice were fed biotin-deficient diets, cleft palate occurred more frequently in male fetuses than in female fetuses. Possible underlying mechanisms are speculated on, and some methodological problems in the analysis of sex-related differences in multiparous animals are discussed. 相似文献
7.
8.
9.
Juvenile three-spined stickleback Gasterosteus aculeatus in their nursery pond had a bimodal length distribution after October in their first year of life. A sea-run migration of all individuals belonging to the lower modal group was observed, with a peak in early November. These data suggest that partial migration based on the early status of individual juveniles occurs in the Pacific Ocean form of three-spined stickleback. 相似文献
10.
N Goto 《Stain technology》1987,62(5):305-315
This paper describes a new series of staining methods which can discriminatively demonstrate every structure of the nervous system, including axons and capillaries, in animal and human materials. Methods described in this paper consist of one primary stain, luxol fast blue-periodic acid Schiff-hematoxylin (LPH) and six different subsidiary staining methods. The LPH triple stain can precisely differentiate the following structures: neurons (Nissl bodies, cytoplasm, nuclear membrane and nucleolus), various kinds of nuclei (glia, ependyma, endothelium, leucocyte, connective tissue, etc.), myelin sheaths, neuronal processes (axons and dendrites), reacted glial cell bodies (protoplasmic astrocytes, foamy cells, etc.), blood vessels (arteries, veins and capillaries), meninges, intervening connective tissue, erythrocytes, lipofuscin granules, amyloid bodies, and others. Subsidiary staining methods are also described briefly. Applications are discussed in the context of staining technology and neuromorphological research. 相似文献