全文获取类型
收费全文 | 1014篇 |
免费 | 23篇 |
出版年
2013年 | 24篇 |
2012年 | 16篇 |
2011年 | 17篇 |
2010年 | 36篇 |
2009年 | 23篇 |
2008年 | 35篇 |
2007年 | 48篇 |
2006年 | 16篇 |
2005年 | 20篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 19篇 |
2001年 | 15篇 |
2000年 | 10篇 |
1999年 | 15篇 |
1998年 | 10篇 |
1997年 | 16篇 |
1996年 | 13篇 |
1995年 | 14篇 |
1994年 | 13篇 |
1993年 | 18篇 |
1992年 | 10篇 |
1991年 | 18篇 |
1990年 | 19篇 |
1989年 | 16篇 |
1988年 | 13篇 |
1987年 | 19篇 |
1986年 | 15篇 |
1985年 | 17篇 |
1984年 | 15篇 |
1982年 | 13篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1976年 | 14篇 |
1975年 | 11篇 |
1974年 | 15篇 |
1973年 | 19篇 |
1972年 | 16篇 |
1971年 | 10篇 |
1970年 | 10篇 |
1968年 | 10篇 |
1965年 | 36篇 |
1964年 | 19篇 |
1963年 | 32篇 |
1962年 | 23篇 |
1961年 | 33篇 |
1960年 | 21篇 |
1959年 | 27篇 |
1958年 | 27篇 |
1957年 | 12篇 |
排序方式: 共有1037条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
996.
Embolic fat as a measure of adequacy of various oxygenators 总被引:1,自引:0,他引:1
997.
998.
A quantitative autoradiographic technique was combined with immunocytochemical staining to compare 3H-estrogen uptake in individual pituitary cell types 1, 14 or 50 days after castration in both male and female rats. Silver grains were counted over nuclei of immunocytochemically stained cells and means were computed for each cell type. The order of labelling intensity for all groups was gonadotropes greater than or equal to lactotropes = somatotropes greater than thyrotropes = corticotropes. In male rats 3H-estrogen uptake capacity in all of these cell types remained unchanged over the post-castration interval. Only gonadotropes from female rats demonstrated a significant change in estrogen uptake capacity over the intervals examined. Uptake in these cells increased by 137% between 1 and 50 days after ovariectomy. At both 14 and 50 days post-ovariectomy, gonadotropes concentrated significantly more radioactive label than either lactotropes or somatotropes. One day after castration, gonadotropes from females concentrated less 3H-estrogen than males while at 50 days after castration they concentrated significantly more than gonadotropes from male rats. 相似文献
999.
The effects of luteinizing hormone (LH) (0, 100, 10,000 lU/ml) and follicle-stimulating hormone (FSH) (20 μg/ml) supplementation during in vitro maturation of slaughterhouse-derived oocytes on polar body formation and embryo development subsequent to in vitro fertilization and nuclear transfer were evaluated. Go-nadotropin supplementation of maturation medium in the presence of serum neither enhanced the proportion of oocytes forming a polar body nor significantly affected development following in vitro fertilization or nuclear transfer, except at the highest LH concentration. A very high concentration of LH (10,000 lU/ml) significantly decreased polar body formation, initial cleavage, and blastocyst development (P < 0.05). © 1993 Wiley-Liss, Inc. 相似文献
1000.