全文获取类型
收费全文 | 1456篇 |
免费 | 99篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 37篇 |
妇产科学 | 34篇 |
基础医学 | 222篇 |
口腔科学 | 42篇 |
临床医学 | 179篇 |
内科学 | 230篇 |
皮肤病学 | 18篇 |
神经病学 | 215篇 |
特种医学 | 85篇 |
外科学 | 183篇 |
综合类 | 54篇 |
预防医学 | 83篇 |
眼科学 | 8篇 |
药学 | 95篇 |
中国医学 | 5篇 |
肿瘤学 | 61篇 |
出版年
2023年 | 13篇 |
2022年 | 9篇 |
2021年 | 21篇 |
2020年 | 9篇 |
2019年 | 19篇 |
2018年 | 20篇 |
2017年 | 20篇 |
2016年 | 29篇 |
2015年 | 32篇 |
2014年 | 39篇 |
2013年 | 69篇 |
2012年 | 67篇 |
2011年 | 56篇 |
2010年 | 53篇 |
2009年 | 32篇 |
2008年 | 56篇 |
2007年 | 48篇 |
2006年 | 74篇 |
2005年 | 51篇 |
2004年 | 61篇 |
2003年 | 53篇 |
2002年 | 39篇 |
2001年 | 40篇 |
2000年 | 44篇 |
1999年 | 26篇 |
1998年 | 30篇 |
1997年 | 23篇 |
1996年 | 17篇 |
1995年 | 21篇 |
1994年 | 15篇 |
1993年 | 27篇 |
1992年 | 34篇 |
1991年 | 30篇 |
1990年 | 27篇 |
1989年 | 25篇 |
1988年 | 26篇 |
1987年 | 31篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1980年 | 22篇 |
1979年 | 12篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1976年 | 15篇 |
1975年 | 15篇 |
1974年 | 10篇 |
1973年 | 9篇 |
1957年 | 7篇 |
排序方式: 共有1556条查询结果,搜索用时 15 毫秒
1.
2.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence. 相似文献
3.
4.
Paul Corcoran Michael J. Kelleher Helen S. Keeley Sinéad Byrne Ursula Burke Eileen Williamson 《Archives of Suicide Research》1997,3(1):65-74
This paper presents a statistical model constructed using logisticregression to identify those at high-risk of repeating parasuicide. Thesubjects in the study are Cork city residents who exhibited parasuicidalbehaviour between 1 January and 30 June 1995. Repetition of the behaviourwithin six months of the index episode distinguishes repeaters fromnon-repeaters. The model was designed so that it could be used bynon-clinicians and hence does not require information relating topsychiatric diagnosis or use of psychiatric services. The proportion ofsubjects correctly classified remained stable across a range of cut-pointprobabilities (mean = 86%, range: 83.9–87.5%). Using acut-point of 0.2, 96% of repeaters and 81% of non-repeaters were correctly classified. Using 0.45 led to the correct identification of81% of repeaters and 90% of non-repeaters. If these highlevels of sensitivity and specificity are maintained in validation tests onfuture cohorts in Cork city then the model could form the basis of anintervention programme designed to prevent the repetition of parasuicide. 相似文献
5.
F. R. VOGELPOEL R. J. VAN KOOIJ E. R. TE VELDE J. VERHOEF 《International journal of andrology》1990,13(2):81-86
Isolated sperm from normo-, oligo- and astheno-spermic men were incubated for 20 h in medium supplemented with 8% heat-inactivated or untreated human serum, and in medium with heated or untreated serum deficient in complement factor C3. Before and after incubation, sperm motility was assessed by means of a computer-assisted semen analyser. The results did not show significant differences between the motility of sperm incubated in heated or untreated serum. It is concluded that heating of homologous serum is not necessary for preserving sperm motility and in some cases may even be disadvantageous. 相似文献
6.
Chromosomes of Plasmodium falciparum 总被引:1,自引:0,他引:1
7.
8.
9.
10.
Robert K. McNamara R. Duncan Kirkby Gregory E. dePape Ronald W. Skelton Michael E. Corcoran 《Hippocampus》1993,3(2):149-152
There is some controversy about the role of long-term potentiation (LTP) in spatial learning. The authors have found that triggering generalized kindled seizures with stimulation of the perforant path disrupts spatial learning in the Morris water maze but that kindling per se does not affect spatial learning. It is suggested that abnormal electrical activity induced by high-frequency stimulation of the perforant path may have been responsible for the disruption of spatial learning previously attributed to LTP saturation. 相似文献