全文获取类型
收费全文 | 4433篇 |
免费 | 387篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 127篇 |
妇产科学 | 109篇 |
基础医学 | 386篇 |
口腔科学 | 98篇 |
临床医学 | 446篇 |
内科学 | 1028篇 |
皮肤病学 | 179篇 |
神经病学 | 170篇 |
特种医学 | 354篇 |
外科学 | 722篇 |
综合类 | 159篇 |
现状与发展 | 30篇 |
一般理论 | 1篇 |
预防医学 | 351篇 |
眼科学 | 63篇 |
药学 | 249篇 |
中国医学 | 11篇 |
肿瘤学 | 355篇 |
出版年
2024年 | 18篇 |
2023年 | 205篇 |
2022年 | 65篇 |
2021年 | 141篇 |
2020年 | 124篇 |
2019年 | 100篇 |
2018年 | 165篇 |
2017年 | 158篇 |
2016年 | 148篇 |
2015年 | 139篇 |
2014年 | 195篇 |
2013年 | 220篇 |
2012年 | 206篇 |
2011年 | 234篇 |
2010年 | 184篇 |
2009年 | 166篇 |
2008年 | 170篇 |
2007年 | 217篇 |
2006年 | 184篇 |
2005年 | 173篇 |
2004年 | 133篇 |
2003年 | 130篇 |
2002年 | 127篇 |
2001年 | 55篇 |
2000年 | 64篇 |
1999年 | 72篇 |
1998年 | 67篇 |
1997年 | 66篇 |
1996年 | 59篇 |
1995年 | 54篇 |
1994年 | 41篇 |
1993年 | 47篇 |
1992年 | 47篇 |
1991年 | 61篇 |
1990年 | 49篇 |
1989年 | 52篇 |
1988年 | 61篇 |
1987年 | 50篇 |
1986年 | 37篇 |
1985年 | 45篇 |
1984年 | 32篇 |
1983年 | 21篇 |
1982年 | 26篇 |
1981年 | 23篇 |
1980年 | 25篇 |
1979年 | 18篇 |
1978年 | 25篇 |
1976年 | 22篇 |
1975年 | 20篇 |
1974年 | 21篇 |
排序方式: 共有4878条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
Ezzeldeen S. El Denshary Mohammad A. Al-Gahazali Fathia A. Mannaa Hesham A. Salem Nabila S. Hassan Mosaad A. Abdel-Wahhab 《Experimental and toxicologic pathology》2012,64(7-8):753-760
Liver diseases are amongst the most serious health problems in the world today and hepatocellular carcinoma is one of the world's deadliest cancers. The aim of the current study was to evaluate the protective effect of sider honey and/or Korean ginseng extract (KGE) against carbon tetrachloride (CCl4)-induced hepato-nephrotoxicity in rat. Eighty male Sprague-Dawley (SD) rats were allocated into different groups and over a 4-week period, they orally received honey and/or KGE or were treated either with CCl4 alone (100 mg/kg b.w) or with CCl4 after a pretreatment period with honey, KGE or a combination of both. Clinical, clinico-pathological and histopathological evaluations were done and CCl4-treated groups were compared with rats receiving no treatment and with rats given honey, KGE or a combination of these substances. The results indicated that oral administration of CCl4 induced severe hepatic and kidney injury associated with oxidative stress. The combined treatment with CCl4 plus honey and/or KGE resulted in a significant improvement in all evaluated parameters. This improvement was prominent in the group receiving CCl4 after combined pretreatment with honey and KGE. Animals receiving honey and/or KGE (without CCl4-treatment) were comparable to the control untreated group. It could be concluded that honey and KGE protect SD rats against the severe CCl4-induced hepatic and renal toxic effects. Our results suggest that the protective activity of honey and KGE may have been related to their antioxidant properties. 相似文献
77.
ECG‐gated pulmonary artery CTA for evaluation of right ventricular function in patients with acute pulmonary embolism 下载免费PDF全文
78.
79.
Levetiracetam (LEV) is an approved drug for the treatment of some epileptic disorders. With few and controversial reports addressing its possible pharmacodynamic interactions, the current study aimed at studying the effect of LEV on isolated rat duodenal strips to enlighten its possible intestinal adverse effects using the isolated smooth muscle strips of rat duodenum. LEV showed a dose‐dependent inhibition in KCl (80 mm )‐induced contractions in normal Tyrode's solution. Moreover, preincubation with LEV (3 mm ) in K+‐rich/Ca2+‐free medium led to a significant decrease in the maximum contractions (Emax) coupled to a right shift of the cumulative CaCl2 concentration curves implying a possible Ca2+ channel blocking potential. In addition, LEV exhibited a typical noncompetitive inhibition in the cumulative carbachol concentration curves evidenced as a decrease in Emax without the alteration of EC50, thus eliminating any possible role of the muscarinic receptors in the relaxant effect. To rule out other possible relaxant mechanisms, tests were conveyed in Tyrode's solution containing either 100 μm l ‐NAME or 10 μm glimepiride to test the possible relaxant roles exhibited by nitric oxide (NO) and KATP channel opening, respectively. None of the tested pathways was involved in LEV‐mediated relaxation. Taken altogether, the results of the current study entail that LEV might exert a relaxant effect on intestinal smooth muscles through blocking L‐type voltage‐operated calcium channels, but not involving either NO release or KATP channel opening. 相似文献
80.