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   2375535篇
  免费   184408篇
  国内免费   4650篇
耳鼻咽喉   33172篇
儿科学   80083篇
妇产科学   66959篇
基础医学   337621篇
口腔科学   64577篇
临床医学   212540篇
内科学   470316篇
皮肤病学   53619篇
神经病学   191749篇
特种医学   92274篇
外国民族医学   1055篇
外科学   359437篇
综合类   53980篇
现状与发展   4篇
一般理论   787篇
预防医学   185266篇
眼科学   53804篇
药学   171940篇
  3篇
中国医学   5056篇
肿瘤学   130351篇
  2019年   18295篇
  2018年   26116篇
  2017年   19779篇
  2016年   22105篇
  2015年   24845篇
  2014年   35043篇
  2013年   52732篇
  2012年   72095篇
  2011年   76471篇
  2010年   45303篇
  2009年   43099篇
  2008年   71606篇
  2007年   76205篇
  2006年   76802篇
  2005年   74684篇
  2004年   72108篇
  2003年   69090篇
  2002年   67392篇
  2001年   116599篇
  2000年   120088篇
  1999年   100976篇
  1998年   28231篇
  1997年   25473篇
  1996年   25831篇
  1995年   24537篇
  1994年   22652篇
  1993年   21189篇
  1992年   78036篇
  1991年   75346篇
  1990年   72797篇
  1989年   69419篇
  1988年   63838篇
  1987年   62611篇
  1986年   58463篇
  1985年   55927篇
  1984年   42412篇
  1983年   35772篇
  1982年   21352篇
  1981年   19180篇
  1979年   37762篇
  1978年   26461篇
  1977年   22146篇
  1976年   20857篇
  1975年   22082篇
  1974年   26212篇
  1973年   25300篇
  1972年   23479篇
  1971年   21307篇
  1970年   20232篇
  1969年   18505篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  相似文献   
105.
106.
Carbon monoxide (CO), a byproduct of heme catalysis, was shown to have potent cytoprotective and anti-inflammatory effects. In vivo recipient CO inhalation at low concentrations prevented ischemia/reperfusion (I/R) injury associated with small intestinal transplantation (SITx). This study examined whether ex vivo delivery of CO in University of Wisconsin (UW) solution could ameliorate intestinal I/R injury. Orthotopic syngenic SITx was performed in Lewis rats after 6 h cold preservation in control UW or UW that was bubbled with CO gas (0.1-5%) (CO-UW). Recipient survival with intestinal grafts preserved in 5%, but not 0.1%, CO-UW improved to 86.7% (13/15) from 53% (9/17) with control UW. At 3 h after SITx, grafts stored in 5% CO-UW showed improved intestinal barrier function, less mucosal denudation and reduced inflammatory mediator upregulation compared to those in control UW. Preservation in CO-UW associated with reduced vascular resistance (end preservation), increased graft cyclic guanosine monophosphate levels (1 h), and improved graft blood flow (1 h). Protective effects of CO-UW were reversed by ODQ, an inhibitor of soluble guanylyl cyclase. In vitro culture experiment also showed better preservation of vascular endothelial cells with CO-UW. The study suggests that ex vivo CO delivery into UW solution would be a simple and innovative therapeutic strategy to prevent transplant-induced I/R injury.  相似文献   
107.
108.
G Pauletto  P Bergonzi 《Seizure》2006,15(3):150-155
The antiepileptic efficacy and tolerability of oxcarbazepine, used both as monotherapy and adjunctive therapy, were observed for 1 year in 202 adult patients, aged 17-83 years, with newly diagnosed or refractory partial epilepsy in clinical practice in Italy. At first observation, the seizure free rate was 72.2% in newly diagnosed patients given monotherapy, 40% in patients in whom oxcarbazepine replaced another monotherapy and 10.3% in patients given oxcarbazepine as adjunctive therapy. At least 50% reduction in seizure frequency was achieved in 90.7, 72 and 57%, respectively. Efficacy increased with the duration of treatment (p < 0.0001). In the 160 completers the seizure free rate was 61.3% with monotherapy and 28% with adjunctive therapy. 16.3% of patients reported adverse effects, mainly sedation and sleepiness; 5% discontinued oxcarbazepine because of adverse events. OXC is an effective and well-tolerated antiepileptic agent for the long-term treatment of partial epilepsy in adults.  相似文献   
109.
110.
背景:针对糖尿病患者Lp(a)水平和冠状动脉疾病(CAD)严重程度之间关系的研究较少并且结论有争议。另外,目前尚无关于apo(a)多态性与上述疾病关系的研究。本研究旨在探讨大样本2型糖尿病患者中冠状动脉粥样硬化的程度与Lp(a)水平及apo(a)多态性的相关性。方法:连续选取227例2型糖  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