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   1403078篇
  免费   101337篇
  国内免费   15957篇
耳鼻咽喉   18740篇
儿科学   37653篇
妇产科学   37256篇
基础医学   193152篇
口腔科学   38364篇
临床医学   124282篇
内科学   275700篇
皮肤病学   28495篇
神经病学   104233篇
特种医学   54774篇
外国民族医学   508篇
外科学   212981篇
综合类   56432篇
现状与发展   40篇
一般理论   326篇
预防医学   91344篇
眼科学   33113篇
药学   110091篇
  190篇
中国医学   14533篇
肿瘤学   88165篇
  2022年   10671篇
  2021年   17647篇
  2020年   12251篇
  2019年   14744篇
  2018年   19188篇
  2017年   15888篇
  2016年   16098篇
  2015年   20569篇
  2014年   27430篇
  2013年   34878篇
  2012年   47945篇
  2011年   50838篇
  2010年   31410篇
  2009年   28113篇
  2008年   43840篇
  2007年   45686篇
  2006年   45440篇
  2005年   44045篇
  2004年   39308篇
  2003年   37703篇
  2002年   36154篇
  2001年   68675篇
  2000年   70697篇
  1999年   60185篇
  1998年   16633篇
  1997年   15064篇
  1996年   14104篇
  1995年   13129篇
  1994年   12263篇
  1993年   10906篇
  1992年   43408篇
  1991年   41008篇
  1990年   39656篇
  1989年   38427篇
  1988年   35303篇
  1987年   34313篇
  1986年   32475篇
  1985年   30669篇
  1984年   22123篇
  1983年   18619篇
  1982年   10569篇
  1979年   19685篇
  1978年   13300篇
  1977年   11402篇
  1975年   11421篇
  1974年   13556篇
  1973年   12862篇
  1972年   12283篇
  1971年   11529篇
  1970年   10938篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
54.
55.
56.
Bipolar disorder (BD) is a common psychiatric mood disorder affecting more than 1-2% of the general population of different European countries. Unfortunately, there is no objective laboratory-based test to aid BD diagnosis or monitor its progression, and little is known about the molecular basis of BD. Here, we performed a comparative proteomic study to identify differentially expressed plasma proteins in various BD mood states (depressed BD, manic BD, and euthymic BD) relative to healthy controls. A total of 10 euthymic BD, 20 depressed BD, 15 manic BD, and 20 demographically matched healthy control subjects were recruited. Seven high-abundance proteins were immunodepleted in plasma samples from the 4 experimental groups, which were then subjected to proteome-wide expression profiling by two-dimensional electrophoresis and matrix-assisted laser desorption/ionization-time-of-flight/time-of-flight tandem mass spectrometry. Proteomic results were validated by immunoblotting and bioinformatically analyzed using MetaCore. From a total of 32 proteins identified with 1.5-fold changes in expression compared with healthy controls, 16 proteins were perturbed in BD independent of mood state, while 16 proteins were specifically associated with particular BD mood states. Two mood-independent differential proteins, apolipoprotein (Apo) A1 and Apo L1, suggest that BD pathophysiology may be associated with early perturbations in lipid metabolism. Moreover, down-regulation of one mood-dependent protein, carbonic anhydrase 1 (CA-1), suggests it may be involved in the pathophysiology of depressive episodes in BD. Thus, BD pathophysiology may be associated with early perturbations in lipid metabolism that are independent of mood state, while CA-1 may be involved in the pathophysiology of depressive episodes.  相似文献   
57.
58.
59.
BackgroundDual antiplatelet therapy (DAPT) is the cornerstone treatment of acute myocardial infarction (AMI).ObjectiveThe present study aimed to investigate the efficacy and safety of triple antiplatelet therapy (TAPT) in elderly female patients with diabetes and ST segment elevation myocardial infarction (STEMI), who had undergone percutaneous coronary intervention (PCI).MethodsWe designed a randomized, single-blind study. Control group A (97 elderly male patients with diabetes and STEMI, whose CRUSADE scores were < 30) received aspirin, ticagrelor, and tirofiban. A total of 162 elderly female patients with diabetes and STEMI were randomly divided into two groups according to CRUSADE score. Group B (69 patients with CRUSADE score > 31) received aspirin and ticagrelor. Group C (93 patients with CRUSADE score < 30) received aspirin, ticagrelor and tirofiban. P values < 0.05 were considered statistically significant.ResultsCompared to the findings in group A, post-PCI Thrombolysis in Myocardial Infarction (TIMI) grade 3 blood flow and TIMI myocardial perfusion grade 3 were significantly less prevalent in group B (p < 0.05). When compared to groups A and C, the incidence of major adverse complications was significantly higher in group B (p < 0.05).ConclusionTAPT could effectively reduce the incidence of major complications in elderly female patients with diabetes and STEMI. However, close attention should be paid to hemorrhage in patients receiving TAPT. (Arq Bras Cardiol. 2020; [online].ahead print, PP.0-0)  相似文献   
60.
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