全文获取类型
收费全文 | 660篇 |
免费 | 0篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 2篇 |
机械仪表 | 7篇 |
水利工程 | 5篇 |
无线电 | 2篇 |
一般工业技术 | 10篇 |
冶金工业 | 631篇 |
原子能技术 | 1篇 |
出版年
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 2篇 |
1999年 | 14篇 |
1998年 | 144篇 |
1997年 | 84篇 |
1996年 | 84篇 |
1995年 | 64篇 |
1994年 | 40篇 |
1993年 | 29篇 |
1992年 | 9篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1987年 | 3篇 |
1983年 | 1篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1978年 | 2篇 |
1977年 | 38篇 |
1976年 | 82篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有660条查询结果,搜索用时 0 毫秒
111.
112.
The submicroscopic organization and activity of acid phosphatase and catalase in lysosomes and peroxisomes of the rat hepatocytes were studied with experimental rachitis. It is determined that total and free activity of acid phosphatase in the liver tissue and certain lysosomes with rachitis increases whereas the catalase activity in the tissue and certain peroxisomes decreases. Permeability of the lysosome and peroxisome membranes rises for enzymes and cations. The process of peroxisome differentiation with rachitis is disturbed: there appear peroxisomes containing the marginal plates, that is not peculiar to the redont peroxisomes. 相似文献
113.
114.
115.
116.
117.
118.
119.
120.
The colonization by streptomycin-resistant Streptococcus mutans strains of the teeth of conventional and ex-germfree Sprague-Dawley rats of various ages fed either a high-sucrose or a high-glucose diet was studied. Bacterial colonization occurred with increasingly greater difficulty as the rats became older. This was observed in studies of the implantation of the test organism after oral inoculation with different cell numbers as well as its transmission between infected and uninfected rats. With rat fed sucrose diet, the effect of age could not be demonstrated until they were age 3 months or older; the results from rats fed a glucose diet suggest that changes may already have occurred early after weaning. Changes in susceptibility to colonization during aging manifested themselves as a decrease in the proportions of rats which became infected as well as lower population levels in infected rats. The possible mechanism(s) involved as well as the possible significance of the findings was discussed. 相似文献