全文获取类型
收费全文 | 340篇 |
免费 | 30篇 |
国内免费 | 31篇 |
专业分类
儿科学 | 15篇 |
妇产科学 | 1篇 |
基础医学 | 18篇 |
口腔科学 | 26篇 |
临床医学 | 44篇 |
内科学 | 85篇 |
皮肤病学 | 8篇 |
神经病学 | 19篇 |
特种医学 | 113篇 |
外科学 | 12篇 |
综合类 | 24篇 |
预防医学 | 3篇 |
药学 | 23篇 |
肿瘤学 | 10篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 12篇 |
2013年 | 10篇 |
2012年 | 4篇 |
2011年 | 6篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 6篇 |
2007年 | 15篇 |
2006年 | 7篇 |
2005年 | 16篇 |
2004年 | 2篇 |
2003年 | 5篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 21篇 |
1997年 | 25篇 |
1996年 | 21篇 |
1995年 | 9篇 |
1994年 | 24篇 |
1993年 | 23篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1989年 | 21篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 4篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 12篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 5篇 |
1975年 | 5篇 |
排序方式: 共有401条查询结果,搜索用时 31 毫秒
41.
Effect of parental age on fertilization and pregnancy characteristics in couples treated by intracytoplasmic sperm injection 总被引:11,自引:5,他引:6
Spandorfer SD; Avrech OM; Colombero LT; Palermo GD; Rosenwaks Z 《Human reproduction (Oxford, England)》1998,13(2):334-338
The purpose of this study was to investigate any influence of maternal
and/or paternal age on gamete characteristics and pregnancy outcomes in
intracytoplasmic sperm injection (ICSI) cycles. In all, 821 consecutive
ICSI cases were analysed retrospectively. While a significant linear
decline in semen volume was detected, no significant differences in the
concentration, motility or morphology of the spermatozoa were found with
paternal ageing. A significant decline in the number of oocytes retrieved
and the number of mature oocytes obtained was found with advancing maternal
age. An increase in the occurrence of digyny was noted with parental
ageing, while no difference in single or bipronuclear fertilization was
found. Older women had a decreased incidence of single pronucleus formation
and an increase in digyny, but no significant difference in the percentage
of oocytes that underwent two-pronuclear fertilization was detected with
regard to maternal ageing. Pregnancy outcomes were not influenced by the
age of the male partner, while a strong negative correlation was found with
maternal ageing. To better analyse male partner ageing as a factor
affecting pregnancy outcome, we analysed a subgroup of patients with a
female partner aged <35 years who underwent ICSI. No paternal influence
on ICSI pregnancy outcome was found in this subgroup of patients. We
conclude that the influence on pregnancy outcome after ICSI is related
mostly to maternal and not paternal age.
相似文献
42.
43.
1-溴-2-甲氧基萘与0-对在苯磺酰乳酸乙酯(1)在无水氯化铝催化下化Friedel-Crafts反应,还原脱溴直接合成dl-1a萘普生(3),以上反应均在“一锅”内完成,收率达95。 相似文献
44.
45.
46.
适当使用时,LABAs利大于弊,可继续用于治疗哮喘。FDA建议仅用于哮喘控制药物如吸入性皮质激素不能有效缓解病情的患者。 相似文献
47.
48.
Restriction endonuclease mapping analyses were made of DNA from a few members of a Macedonian family with hematological characteristics of delta beta-thalassemia, ie, microcytosis, normal HbA2 levels, and elevated levels of HbF (7% to 14%) with G gamma (average 40.5%) and A gamma T chains (average 59.5%). A large deletion of 18 to 23 kb was present with a 5' breakpoint within a 670-bp segment of DNA between the HpaI and NcoI restriction sites 5' to the delta globin gene, and a 3' breakpoint between the BamHI and HpaI restriction sites located some 9 to 13 kb 3' to the beta globin gene. This deletion is different from those present in other types of G gamma A gamma(delta beta)zero- thalassemia. The similarity of the hematological expression of these delta beta-thalassemic conditions which have somewhat comparable 5' breakpoints supports the idea that an important fetal hemoglobin- controlling region lies between the psi beta and delta globin genes. 相似文献
49.
50.