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   35762篇
  免费   2041篇
  国内免费   365篇
耳鼻咽喉   452篇
儿科学   637篇
妇产科学   623篇
基础医学   4632篇
口腔科学   1207篇
临床医学   2948篇
内科学   8207篇
皮肤病学   849篇
神经病学   2612篇
特种医学   1381篇
外国民族医学   2篇
外科学   5679篇
综合类   845篇
一般理论   2篇
预防医学   1228篇
眼科学   548篇
药学   2551篇
  4篇
中国医学   251篇
肿瘤学   3510篇
  2022年   398篇
  2021年   777篇
  2020年   400篇
  2019年   562篇
  2018年   735篇
  2017年   568篇
  2016年   589篇
  2015年   680篇
  2014年   895篇
  2013年   1000篇
  2012年   1530篇
  2011年   1632篇
  2010年   971篇
  2009年   882篇
  2008年   1444篇
  2007年   1509篇
  2006年   1524篇
  2005年   1545篇
  2004年   1519篇
  2003年   1518篇
  2002年   1520篇
  2001年   1349篇
  2000年   1482篇
  1999年   1265篇
  1998年   445篇
  1997年   318篇
  1996年   333篇
  1995年   292篇
  1994年   263篇
  1993年   235篇
  1992年   810篇
  1991年   764篇
  1990年   690篇
  1989年   702篇
  1988年   681篇
  1987年   663篇
  1986年   678篇
  1985年   597篇
  1984年   429篇
  1983年   355篇
  1979年   339篇
  1978年   233篇
  1977年   201篇
  1975年   199篇
  1974年   226篇
  1973年   207篇
  1972年   197篇
  1971年   209篇
  1970年   203篇
  1969年   224篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Finasteride is standard medical treatment for androgenetic alopecia; however, no large studies with 5 years or more of follow up have been performed in Japan. The authors followed Japanese men with androgenetic alopecia treated with finasteride for 5 years to evaluate long‐term treatment efficacy. Of 903 men treated with finasteride (1 mg/day), 801 patients were evaluated over 5 years by modified global photographic assessment. Although the proportion of improvement was high (99.4%), modified global photographic assessment scores after 5 years of treatment were lower in patients with more advanced disease as measured by the modified Norwood–Hamilton scale. After separating patients into “sufficient” and “insufficient” efficacy groups according to the modified global photographic assessment score after 5 years (scores ≥6 and <6, respectively), multivariate analysis showed that independent risk factors of insufficient efficacy were age at start of treatment of 40 years or more (P = 0.021) and classification on the modified Norwood–Hamilton scale (P < 0.001), whereas presence of stress at start of treatment was a negative predictor (P = 0.025). In conclusion, continuous finasteride treatment for 5 years improved androgenetic alopecia with sustained effect among Japanese. Younger age and less advanced disease at start of treatment were the key predictors of higher finasteride efficacy.  相似文献   
3.
目的:探讨微波配合序贯扩肛治疗陈旧性肛裂的临床疗效。方法:选取陈旧性肛裂患者78例,随机分为对照组和治疗组,每组各39例。对照组患者采用后卫内括约肌部分切断治疗,治疗组患者采用微波配合序贯扩肛治疗。结果:观察组患者术中出血量、切口愈合时间均少于对照组(P<0.05),并发症发生率低于对照组(P<0.05)。结论:采用微波配合序贯扩肛治疗陈旧性肛裂,临床疗效显著。  相似文献   
4.

Background

There were few studies assessed the postoperative sarcopenia in patients with cancers. The objective of present study was to assess whether postoperative development of sarcopenia could predict a poor prognosis in patients with adenocarcinoma of esophagogastric junction, (AEG) and upper gastric cancer (UGC).

Methods

Patients with AEG and UGC who were judged as non-sarcopenic before surgery were reassessed the presence of postoperative development of sarcopenia 6 months after surgery. Patients were divided into the development group or non-development group, and clinicopathological factors and prognosis between these two groups were analyzed.

Results

The 5-year overall survival rates were significantly poorer in the development group than non-development group (68.0% vs. 92.6%, P?=?0.0118). Multivariate analyses showed that postoperative development of sarcopenia was an independent prognostic factor for poor overall survival (P?=?0.0237).

Conclusions

Postoperative development of sarcopenia was associated with a poor prognosis in patients with AEG and UGC.  相似文献   
5.
A pathological feature in atherosclerosis is the dysfunction and death of vascular endothelial cells (EC). Oxidized low‐density lipoprotein (LDL), known to accumulate in the atherosclerotic arterial walls, impairs endothelium‐dependent relaxation and causes EC apoptosis. A major bioactive ingredient of the oxidized LDL is lysophosphatidylcholine (LPC), which at higher concentrations causes apoptosis and necrosis in various EC. There is hitherto no report on LPC‐induced cytotoxicity in brain EC. In this work, we found that LPC caused cytosolic Ca2+ overload, mitochondrial membrane potential decrease, p38 activation, caspase 3 activation and eventually apoptotic death in mouse cerebral bEND.3 EC. In contrast to reported reactive oxygen species (ROS) generation by LPC in other EC, LPC did not trigger ROS formation in bEND.3 cells. Pharmacological inhibition of p38 alleviated LPC‐inflicted cell death. We examined whether heparin could be cytoprotective: although it could not suppress LPC‐triggered Ca2+ signal, p38 activation and mitochondrial membrane potential drop, it did suppress LPC‐induced caspase 3 activation and alleviate LPC‐inflicted cytotoxicity. Our data suggest LPC apoptotic death mechanisms in bEND.3 might involve mitochondrial membrane potential decrease and p38 activation. Heparin is protective against LPC cytotoxicity and might intervene steps between mitochondrial membrane potential drop/p38 activation and caspase 3 activation.  相似文献   
6.
7.
8.
Eosinophilic dermatosis of hematological malignancy is a paraneoplastic skin eruption associated with chronic lymphocytic leukemia and other B‐cell malignancies. It clinically resembles an insect bite reaction and it can precede the symptoms of the hematological malignancy or be related to a more aggressive course. Different treatments have been proposed, but partial response and recurrence are frequent. Herein, we describe a case of eosinophilic dermatosis associated with mantle cell lymphoma with remission after lenalidomide therapy.  相似文献   
9.
新型冠状病毒肺炎(简称新冠肺炎, COVID-19)是近期流行的一种新发传染病,已造成大量人员感染,其中包括医务人员。为预防生殖医学的医院感染,有效降低新冠肺炎在生殖专科机构传播的风险,通过查询相关文献、指南和规范等,并结合生殖医学特点,制定生殖医学有关的临床区、手术室和实验室及相关人员预防新冠肺炎的措施。  相似文献   
10.
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