首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   26685篇
  免费   1402篇
  国内免费   98篇
耳鼻咽喉   387篇
儿科学   2089篇
妇产科学   628篇
基础医学   3026篇
口腔科学   478篇
临床医学   1491篇
内科学   5051篇
皮肤病学   1094篇
神经病学   1163篇
特种医学   1153篇
外科学   3943篇
综合类   939篇
一般理论   10篇
预防医学   1314篇
眼科学   1258篇
药学   2137篇
中国医学   143篇
肿瘤学   1881篇
  2022年   147篇
  2021年   726篇
  2020年   409篇
  2019年   477篇
  2018年   688篇
  2017年   461篇
  2016年   671篇
  2015年   600篇
  2014年   931篇
  2013年   1138篇
  2012年   1528篇
  2011年   1629篇
  2010年   924篇
  2009年   762篇
  2008年   1249篇
  2007年   1332篇
  2006年   1146篇
  2005年   1090篇
  2004年   970篇
  2003年   897篇
  2002年   819篇
  2001年   743篇
  2000年   695篇
  1999年   616篇
  1998年   327篇
  1997年   251篇
  1996年   219篇
  1995年   185篇
  1994年   176篇
  1993年   181篇
  1992年   364篇
  1991年   405篇
  1990年   362篇
  1989年   398篇
  1988年   350篇
  1987年   309篇
  1986年   294篇
  1985年   305篇
  1984年   242篇
  1983年   193篇
  1982年   131篇
  1979年   256篇
  1978年   170篇
  1977年   163篇
  1976年   148篇
  1975年   174篇
  1974年   160篇
  1973年   190篇
  1972年   145篇
  1971年   129篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
31.
32.
A case of odontoameloblastoma affecting the left mandible is reported. Initially treated by conservative excision due to its small size, the lesion recurred after 18 months and was treated by radical excision and subsequent reconstruction by a rib graft.  相似文献   
33.
The return of fertility following discontinuation of norethisterone oenanthate (NET EN) 200 mg injectable contraceptive after use for a minimum period of six months or more was studied in 69 women who discontinued the method for planning pregnancy. Former users of copper intra-uterine device (CuT 200) were enrolled as a control group. Another 161 women who had discontinued NET EN due to other reasons (e.g. amenorrhoea, excessive bleeding or personal reasons) were also studied for return of fertility after ensuring that they were not using any other method of contraception and were exposed to the risk of pregnancy. The subjects from both groups were followed for a period of one year. The cumulative conception rates at one year were 72.5 and 83.6 per 100 subjects for ex-NET EN and ex-CuT 200 users who had discontinued the method for planning pregnancy and this difference was not statistically significant (P > 0.05). The median time for conception for ex-NET EN users was 7.8 months as compared to 3.7 months in ex-CuT 200 users but the cumulative conception rates at the end of one year show that future return of fertility in NET EN users does not appear to be adversely affected.

In 51 subjects who had discontinued NET EN due to amenorrhoea, the return of fertility was predictably slower and less. The return of fertility in subjects who discontinued NET EN for other reasons (e.g. excessive bleeding and other personal reasons) was similar to ex-NET EN and ex-CuT 200 users.  相似文献   

34.
35.
The abdominal compartment syndrome is a life threatening condition resulting from pathologic elevation of the intraabdominal pressure. Prompt diagnosis is required to avoid significant sequelae. Diagnosis of this syndrome is based on clinical findings and intra abdominal pressure monitoring. Treatment consists of decompressive laparotomy, which corrects the pathology. Various surgical techniques are described to manage the open abdomen. Despite considerable attention accorded to this disorder, it is still associated with high morbidity and mortality. This review article deals with the identification of risk factors, pathophysiology, diagnostic criteria and treatment of critically ill patients with the abdominal compartment syndrome.  相似文献   
36.
Anti-inflammatory activity and protective effect against CCl (4)-induced hepatotoxicity of alcoholic extract of leaves of WITHANIA SOMNIFERA have been assessed. The leaves were found to possess marked effects in subacute inflammation and hepatotoxicity. A comparison of the anti-inflammatory properties revealed the extract at 1 g/kg dose to be as active as 50 mg/kg of phenylbutazone and 10 mg/kg of hydrocortisone. The protective effect of the extract at 1 g/kg dose against CCl (4)-induced hepatotoxicity was comparable to 10 mg/kg of hydrocortisone.  相似文献   
37.
38.
The 96 h LC50 values of six insecticides were determined on a non-target epigeic earthworm Perionyx excavatus under laboratory conditions. Cypermethrin was found most toxic to P. excavatus (LC50-0.008 mg/kg), followed by endosulfan (LC50-0.03 mg/kg), carbaryl (LC50-6.07 mg/kg), chlorpyrifos (LC50-7.3 mg/kg), aldicarb (LC50-10.63 mg/kg) and monocrotophos (LC50-13.04 mg/kg). When these LC50 values were compared with their respective recommended agricultural doses, aldicarb and carbaryl appeared more dangerous than other pesticides because of their lower LC50 values than their respective recommended agricultural dose. Mean lethal time to cause 50% mortality at recommended agricultural dose (LT50) also indicated that aldicarb achieved the fastest LT50 (26 h) followed by endosulfan (38 h) and carbaryl (44 h) indicating the danger of these pesticides to P. excavatus.  相似文献   
39.
40.
Infections caused by extended-spectrum beta-lactamase (ESBL)-producing pathogens, particularly Klebsiella pneumoniae, are increasing. The epidemiology of ESBL-producing K. pneumoniae, the mechanisms of resistance, and treatment strategies for infections caused by these organisms are reviewed.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号