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   21004篇
  免费   1116篇
  国内免费   113篇
耳鼻咽喉   227篇
儿科学   450篇
妇产科学   457篇
基础医学   2694篇
口腔科学   577篇
临床医学   1621篇
内科学   5590篇
皮肤病学   527篇
神经病学   1912篇
特种医学   527篇
外科学   3252篇
综合类   102篇
现状与发展   1篇
一般理论   5篇
预防医学   1523篇
眼科学   391篇
药学   1038篇
中国医学   43篇
肿瘤学   1296篇
  2023年   168篇
  2022年   368篇
  2021年   804篇
  2020年   357篇
  2019年   703篇
  2018年   823篇
  2017年   471篇
  2016年   479篇
  2015年   557篇
  2014年   762篇
  2013年   1082篇
  2012年   1757篇
  2011年   1656篇
  2010年   960篇
  2009年   889篇
  2008年   1413篇
  2007年   1424篇
  2006年   1343篇
  2005年   1318篇
  2004年   1068篇
  2003年   998篇
  2002年   943篇
  2001年   119篇
  2000年   68篇
  1999年   129篇
  1998年   142篇
  1997年   140篇
  1996年   116篇
  1995年   121篇
  1994年   102篇
  1993年   83篇
  1992年   69篇
  1991年   61篇
  1990年   43篇
  1989年   38篇
  1988年   40篇
  1987年   37篇
  1986年   40篇
  1985年   41篇
  1984年   41篇
  1983年   24篇
  1982年   29篇
  1981年   39篇
  1980年   26篇
  1979年   33篇
  1978年   33篇
  1977年   21篇
  1976年   29篇
  1975年   20篇
  1974年   22篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.

Objective  

The aim of the project was to assess the effectiveness and safety of weekly epoetin-beta (EB) in patients with gastrointestinal cancer (GIC) subjected to concomitant chemoradiotherapy (CCTRT).  相似文献   
23.
24.
25.
26.
Measurement of ultrasonographic parameters provides information concerning not only bone density but also bone architecture. We investigated the usefulness of ultrasonographic parameters and bone mineral density (BMD) to evaluate the probability of Colles' fracture. Two-hundred eighty-nine postmenopausal women (62.3 +/- 8.7 yr) with (n = 76) and without (n = 213) Colles' fracture were studied. BMD of lumbar spine and proximal femur was evaluated in all women by dual-energy X-ray absorptiometry (DXA) and speed of sound (SOS), broadband ultrasound attenuation (BUA), and stiffness in the calcaneus were measured by a Sahara ultrasonometer (Hologic). Patients suffering from Colles' fracture had lower values of BMD adjusted by height at the lumbar spine, L2-L4 (0.797 g/cm2 vs 0.860 g/cm2), femoral neck (0.685 g/cm2 vs 0.712 g/cm2 ), SOS (1518 m/sg vs 1525 m/sg), and stiffness (74.6 vs 77.7) (p < 0.05). Nevertheless, BUA values were similar in both groups. After stepwise logistic regression analysis, the area found under receiver operating characteristic (ROC) curves was 0.60 for L2L4 and 0.63 for a formula combining L2L4 and height. Our data suggest that patients suffering from Colles' fracture have lower values of BMD by DXA, SOS, and stiffness. However, the ability of these techniques to discriminate is low because the values for the area under ROC curve are 0.60 for L2-L4 and 0.63 for a formula derived of the combination of L2-L4 and height.  相似文献   
27.
Colorectal cancer is one of the best studied of all malignant diseases interms of genetics and/or molecular prognostic factors. These factors, and relationships with prognosis, may have important implications especially in the design of surgical and adjuvant chemo-radiotherapy options. However, the true prognostic significance of all known factors has yet to be realised. We have reviewed the literature with specific focus on the role of molecular markers involved in prognosis and the prediction of response to adjuvant treatment.  相似文献   
28.
29.
In neurons, a network of endocytic proteins accomplishes highly regulated processes such as synaptic vesicle cycling and the timely internalization of intracellular signaling molecules. In this review, we discuss recent advances on molecular networks created through interactions between proteins bearing the Eps15 homology (EH) domain and partner proteins containing the Asn–Pro–Phe (NPF) motif, which participate in important aspects of neuronal function as the synaptic vesicle cycle, the internalization of nerve growth factor (NGF), the determination of neuronal cell fate, the development of synapses and the trafficking of postsynaptic receptors. We discuss novel functional findings on the role of intersectin and synaptojanin and then we focus on the features of an emerging family of EH domain proteins termed EHDs (EH domain proteins), which are important for endocytic recycling of membrane proteins.  相似文献   
30.
We report the case of a 49-year-old patient, with recent onset of fatigue, who was diagnosed with atrial fibrillation, which was cardioverted electrically. A diagnosis of right atrial aneurysm, with no other cardiac pathology, was made. An aneurysmectomy was performed. Both surgery and postoperative recovery were uneventful.  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