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   125135篇
  免费   5582篇
  国内免费   298篇
耳鼻咽喉   1697篇
儿科学   3865篇
妇产科学   3154篇
基础医学   17320篇
口腔科学   3232篇
临床医学   9751篇
内科学   27451篇
皮肤病学   3277篇
神经病学   10429篇
特种医学   2693篇
外国民族医学   2篇
外科学   14498篇
综合类   636篇
一般理论   52篇
预防医学   14288篇
眼科学   2756篇
药学   9325篇
  7篇
中国医学   378篇
肿瘤学   6204篇
  2023年   820篇
  2022年   843篇
  2021年   2441篇
  2020年   1350篇
  2019年   2562篇
  2018年   4066篇
  2017年   2510篇
  2016年   2454篇
  2015年   2930篇
  2014年   3285篇
  2013年   5256篇
  2012年   8365篇
  2011年   8659篇
  2010年   4492篇
  2009年   3478篇
  2008年   7116篇
  2007年   7484篇
  2006年   7270篇
  2005年   7178篇
  2004年   6651篇
  2003年   6156篇
  2002年   5768篇
  2001年   3351篇
  2000年   3513篇
  1999年   2871篇
  1998年   692篇
  1997年   450篇
  1996年   480篇
  1995年   364篇
  1992年   1345篇
  1991年   1259篇
  1990年   1163篇
  1989年   1054篇
  1988年   932篇
  1987年   944篇
  1986年   874篇
  1985年   841篇
  1984年   651篇
  1983年   534篇
  1979年   636篇
  1978年   368篇
  1975年   369篇
  1974年   553篇
  1973年   505篇
  1972年   446篇
  1971年   401篇
  1970年   471篇
  1969年   425篇
  1968年   412篇
  1967年   370篇
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
31.
32.
There is an increasing request by patients or their representatives not to have some data registered in their clinical history or if such data exists to be deleted. Without doubt, this is so because such clinical data is accessed by various professionals who in most cases are not directly involved in caring for such patients. On the other hand, such data is copied and iteratively and unnecessary reproduced in various discharge reports and others forms. The problem arises when such controversial data refer to particularly sensitive clinical aspects such as assisted reproduction techniques, which invades personal and family privacy. Therefore, the question is who determines what data should be recorded in the medical records and according to what criteria should be taken that decision?  相似文献   
33.
34.
Introduction: Polymyalgia rheumatica (PMR), a common disease in individuals older than 50 in the western world, is characterized by bilateral inflammatory pain involving the shoulder girdle and less commonly the neck and pelvic girdle. The main goals of the currently available treatment are to induce remission and prevent relapse.

Areas covered: This review briefly presents the main epidemiological and clinical features of PMR and discusses in depth both its classical management as well as new therapies used in PMR.

Expert opinion: In general, patients with isolated PMR experience a rapid response (in less than seven days) to 12.5–25 mg/prednisone/day. Methotrexate is the conventional disease-modifying antirheumatic drug most commonly used for disease management, especially for relapses of the disease. However, this agent often yields a modest effect. Randomized controlled trials do not support the use of antitumor necrosis factor agents in PMR. Several case series and retrospective studies have highlighted the efficacy of the anti-interleukin-6 receptor antibody tocilizumab in PMR. However, controlled trials are needed to fully establish the efficacy of this biologic agent in PMR. The potential beneficial effect of the Janus-kinase inhibitors remains to be determined.  相似文献   

35.
Arginine-rich protein motifs have been described as potent cell-penetrating peptides (CPPs) but also as rather specific ligands of the cell surface chemokine receptor CXCR4, involved in the infection by the human immunodeficiency virus (HIV). Polyarginines are commonly used to functionalize nanoscale vehicles for gene therapy and drug delivery, aimed to enhance cell penetrability of the therapeutic cargo. However, under which conditions these peptides do act as either unspecific or specific ligands is unknown. We have here explored the cell penetrability of differently charged polyarginines in two alternative presentations, namely as unassembled fusion proteins or assembled in multimeric protein nanoparticles. By this, we have observed that arginine-rich peptides switch between receptor-mediated and receptor-independent mechanisms of cell penetration. The relative weight of these activities is determined by the electrostatic charge of the construct and the oligomerization status of the nanoscale material, both regulatable by conventional protein engineering approaches.  相似文献   
36.
This collaboration briefly reviews the characteristics of professional learning. It pays special attention to the learning that takes place during clinical practices and to the fundamental role of reflection in the construction of knowledge and in the better understanding of the situation of the other (patients, family members, professionals) and oneself. It emphasizes the learning of values and attitudes, which are manifested in behaviors. Finally, it describes the characteristics of learning by role modeling and the influence of hidden curriculum on the development of professional competences.  相似文献   
37.
38.
39.
40.
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