全文获取类型
收费全文 | 1360篇 |
免费 | 70篇 |
专业分类
1430篇 |
出版年
2016年 | 16篇 |
2015年 | 19篇 |
2014年 | 21篇 |
2013年 | 46篇 |
2012年 | 33篇 |
2011年 | 33篇 |
2010年 | 43篇 |
2009年 | 30篇 |
2008年 | 47篇 |
2007年 | 67篇 |
2006年 | 37篇 |
2005年 | 38篇 |
2004年 | 26篇 |
2003年 | 22篇 |
2002年 | 30篇 |
2001年 | 21篇 |
2000年 | 24篇 |
1999年 | 27篇 |
1998年 | 22篇 |
1997年 | 23篇 |
1996年 | 22篇 |
1995年 | 17篇 |
1994年 | 15篇 |
1993年 | 20篇 |
1991年 | 25篇 |
1990年 | 21篇 |
1989年 | 19篇 |
1987年 | 22篇 |
1986年 | 17篇 |
1985年 | 19篇 |
1984年 | 20篇 |
1982年 | 14篇 |
1980年 | 18篇 |
1979年 | 16篇 |
1976年 | 16篇 |
1975年 | 15篇 |
1974年 | 24篇 |
1973年 | 27篇 |
1972年 | 20篇 |
1971年 | 16篇 |
1969年 | 14篇 |
1965年 | 37篇 |
1964年 | 20篇 |
1963年 | 33篇 |
1962年 | 24篇 |
1961年 | 35篇 |
1960年 | 21篇 |
1959年 | 29篇 |
1958年 | 28篇 |
1957年 | 13篇 |
排序方式: 共有1430条查询结果,搜索用时 15 毫秒
11.
SYNOPSIS. Plasmodium balli sp. nov. is described from Anolis lionotus and A. poecilopus of central Panama.
Large, elongate gametocytes and segmenters containing up to 100 merozoites are produced by P. balli. Proerythrocytes and normoblasts are more commonly parasitized than erythrocytes. Pigment is uncommon, but when present consists of a minute dot. Hypertrophy, distortion and lysis of host cell nuclei may result from parasitization of immature blood cells by gametocytes, while enucleated host cells are common. 相似文献
Large, elongate gametocytes and segmenters containing up to 100 merozoites are produced by P. balli. Proerythrocytes and normoblasts are more commonly parasitized than erythrocytes. Pigment is uncommon, but when present consists of a minute dot. Hypertrophy, distortion and lysis of host cell nuclei may result from parasitization of immature blood cells by gametocytes, while enucleated host cells are common. 相似文献
12.
13.
No catalase activity was detected in four strains of glucose-grown Mycoplasma pneumoniae at any time during the replication of the organism. Exogenous catalase dramatically increased the O(2) uptake with glycerol, presumably by releasing inhibition caused by hydrogen peroxide. The effect of added catalase on the O(2) uptake of washed organisms with glucose as substrate was moderate and variable in degree. The production of hydrogen peroxide was demonstrated by the quantitative enzymatic assay for inorganic peroxide and by the fact that added pyruvate, which is non-enzymatically oxidized by H(2)O(2) to acetic acid and CO(2) could mimic the action of catalase. 相似文献
14.
Partitioning of respiratory flow resistance in man 总被引:9,自引:0,他引:9
15.
16.
17.
Kinetic aspects of singing 总被引:1,自引:0,他引:1
18.
19.
Postural effect on ventilatory control 总被引:1,自引:0,他引:1
20.
The site specificity of the apicomplexans Gregarina cuneata and Gregarina sleini , in larval Tenebrio molitor was investigated. Gregarina cuneata was found to inhabit the anteriormost region of the larval midgut, while G. steini was restricted to the posterior portion of the intestine. The site specificity of the pair was conserved in single and concurrent infections. Interspecific interactions do not seem to be presently responsible for the resource partitioning by the 2 gregarine species. Key words. Gregarina, site specificity, Tenebrio molitor. 相似文献