全文获取类型
收费全文 | 355篇 |
免费 | 10篇 |
出版年
2021年 | 3篇 |
2019年 | 3篇 |
2018年 | 8篇 |
2017年 | 12篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 12篇 |
2013年 | 18篇 |
2012年 | 7篇 |
2011年 | 19篇 |
2010年 | 17篇 |
2009年 | 11篇 |
2008年 | 11篇 |
2007年 | 16篇 |
2006年 | 12篇 |
2005年 | 12篇 |
2004年 | 8篇 |
2003年 | 8篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 2篇 |
1987年 | 8篇 |
1986年 | 4篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1979年 | 3篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 7篇 |
1974年 | 5篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1970年 | 2篇 |
1969年 | 5篇 |
1968年 | 6篇 |
1967年 | 5篇 |
1966年 | 5篇 |
1965年 | 6篇 |
排序方式: 共有365条查询结果,搜索用时 218 毫秒
361.
362.
T A Kovaleva 《Tsitologiia》1976,18(8):1032-1034
The influence of uretane on ATPase activity and contractility of frog glycerinated muscle fibers was studied. Parallel decrease of contractility and ATPase activity of glycerinated muscles takes place upon toxic uretane concentration (1.01 M). A lower uretane concentration (0.34 M) inducing considerable increase of conservation time contractive reaction maintains a higher ATPase activity than does the control one; ATPase activity of the actomyosin from these models is the same as the control one. 相似文献
363.
364.
The hypothesis concerning the increase of the risk of appearance of offsprings with trisomy 21 in parents having double satellite acrocentric chromosomes is checked. Chromosomes of 266 parents having offsprings with Down's disease were examined, including 73 donors of extrachromosome 21. The frequency of chromosomes with dNORs in the total and in the donor groups did not differ from that of the control group. From 42 donors of extrachromosome, who demonstrated a nondisjunction in the first meiotic division, double satellites were revealed only once. In addition, data on the frequency of Dp+ and Gp+ variants are presented and discussed. 相似文献
365.
Summary The nuclear apparatus ofRemanella granulosa has been investigated using conventional TEM methods and Bernhard's technique of preferential RNP staining. This species has two (rarely three) macronuclei and a single micronucleus (rarely two micronuclei). The nuclei always form a single group.The macronuclei contain a fibro-granular matrix resistant to EDTA destaining, and several nucleoli and chromatin bodies. The chromatin bodies are readily bleached with EDTA and are often clustered, or even fused, forming chromocenters. The nuclei are of the compact concentric type. Some macronuclei contain nuclear bodies, as finely fibrous spheres or bundles of coarse fibers, or both. Neither type of nuclear body is destained with EDTA. The spheres are frequently associated with nucleoli. There is no evidence of any transition between the two types of nuclear bodies. The macronuclear envelope contains numerous pore complexes and is strengthened with an electron dense layer. The micronucleus is filled with spongy condensed chromatin and surrounded by an envelope with occasional pores. This nucleus lacks nucleoli and nuclear bodies. 相似文献