全文获取类型
收费全文 | 285481篇 |
免费 | 23575篇 |
国内免费 | 3958篇 |
专业分类
耳鼻咽喉 | 6831篇 |
儿科学 | 8348篇 |
妇产科学 | 6572篇 |
基础医学 | 21755篇 |
口腔科学 | 5134篇 |
临床医学 | 35872篇 |
内科学 | 69279篇 |
皮肤病学 | 9872篇 |
神经病学 | 23228篇 |
特种医学 | 10455篇 |
外国民族医学 | 3篇 |
外科学 | 57654篇 |
综合类 | 5454篇 |
现状与发展 | 72篇 |
一般理论 | 36篇 |
预防医学 | 15712篇 |
眼科学 | 6156篇 |
药学 | 11241篇 |
4篇 | |
中国医学 | 827篇 |
肿瘤学 | 18509篇 |
出版年
2023年 | 5390篇 |
2022年 | 1976篇 |
2021年 | 4131篇 |
2020年 | 6614篇 |
2019年 | 3240篇 |
2018年 | 8971篇 |
2017年 | 8499篇 |
2016年 | 9593篇 |
2015年 | 9822篇 |
2014年 | 17316篇 |
2013年 | 17996篇 |
2012年 | 9023篇 |
2011年 | 9344篇 |
2010年 | 12609篇 |
2009年 | 16243篇 |
2008年 | 9220篇 |
2007年 | 7665篇 |
2006年 | 10103篇 |
2005年 | 6946篇 |
2004年 | 6026篇 |
2003年 | 4783篇 |
2002年 | 4721篇 |
2001年 | 10503篇 |
2000年 | 9900篇 |
1999年 | 8889篇 |
1998年 | 5455篇 |
1997年 | 4823篇 |
1996年 | 4275篇 |
1995年 | 4060篇 |
1994年 | 2725篇 |
1993年 | 2330篇 |
1992年 | 5093篇 |
1991年 | 5210篇 |
1990年 | 4606篇 |
1989年 | 4718篇 |
1988年 | 4435篇 |
1987年 | 4127篇 |
1986年 | 3971篇 |
1985年 | 3680篇 |
1984年 | 2591篇 |
1983年 | 2304篇 |
1982年 | 1492篇 |
1979年 | 2217篇 |
1978年 | 1516篇 |
1975年 | 1469篇 |
1974年 | 1580篇 |
1973年 | 1643篇 |
1972年 | 1661篇 |
1971年 | 1452篇 |
1970年 | 1390篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Milton G. Mutchnick MD Horchang H. Lee MD 《Alcoholism, clinical and experimental research》1988,12(1):155-158
Concanavalin A-induced lymphocyte proliferation was studied in 25 patients with alcoholic hepatitis or compensated alcoholic cirrhosis. Nine alcoholics without evidence of liver disease were also evaluated. A nonlinear correlation equation, which was natural logarithmic, was applied to individual dose-response proliferation curves and permitted comparisons between patient groups and controls. The proliferative response in all patient groups was significantly lower when compared to healthy controls and was independent of the presence or absence of liver disease. This suggests that some changes in immune function observed in alcoholics may be linked to the direct effects of alcohol on the immune system rather than to the associated liver disease. 相似文献
12.
SRIVASTAVA Z. I.; MATHUR N.; RASTOGI S. K.; GUPTA B. N. 《Occupational medicine (Oxford, England)》1988,38(4):134-136
Eighty-nine cases of chronic bronchitis were matched against167 asymptomatic controls from the glass bangle industry ofFirozabad. Factors of age, social status, smoking habit andduration of exposure were studied. Duration of exposure wasfound to be a factor contributing significantly to the causationof disease.
Requests for reprints should be addressed to: Dr B. N. Gupta, Division of Epidemilogy, Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Lucknow P.O. Box 80, 226001, India 相似文献
13.
14.
Effects of the MAO-A-inhibitor brofaromine (BRO), 10 mg/kg po after repeated (twice daily for 14 days) administration on the spontaneous behavior (exploratory and basal locomotor activities) and the exploratory activity modified by methoxamine, clonidine and d-amphetamine in male Wistar rats were studied in both light and dark phases of a diurnal cycle (L: 0700-1900 h). After single administration BRO in the light phase had no effects. In the dark phase BRO decreased the exploration (62% of control, p less than 0.01), increased the clonidine-evoked hypoactivity and amphetamine-evoked hyperactivity. The L-D differences occurred also after repeated administration. BRO in the light phase did not influence the exploration, decreased basal locomotor activity, did not change methoxamine and clonidine action and potentiated the action of amphetamine. In the dark phase, however, it did not influence the exploration and basal locomotor activity, intensified the methoxamine effect, and did not change the clonidine and amphetamine actions. The results demonstrate that the effects of BRO on behavior in rats: 1) differ from the effects caused by other antidepressants which are not MAO inhibitors; 2) are phase-dependent after both single and repeated administration. 相似文献
15.
16.
A patient with Graves' disease had a symptomatic thrombocytopathy during periods of remission. When euthyroid, she noticed bruising, petechiae, and epistaxis. Hemostatic abnormalities included prolongation of the bleeding time by aspirin, reduced platelet retention (a second-phase defect), and abnormal thrombin-induced aggregation and serotonin release. When hyperthyroid, bleeding symptoms resolved, and platelet function returned to normal. These observations suggest that mild bleeding disorders may be influenced either directly or indirectly by thyroid hormone levels. 相似文献
17.
18.
19.
20.
Normal seminal vesicles were studied histologically in 80, and by Feulgen’s cytophotometric method in 10 autopsied cases (males,
44–82 years of age). In every case large, hyperchromatic nuclei were found. By cytophotometry euploid polyploid atypia was
also shown in every case, which is characteristic of benign hormonal dysplasia. 相似文献