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   53282篇
  免费   14372篇
  国内免费   219篇
耳鼻咽喉   1239篇
儿科学   1397篇
妇产科学   2590篇
基础医学   1135篇
口腔科学   3653篇
临床医学   20502篇
内科学   11737篇
皮肤病学   847篇
神经病学   3236篇
特种医学   1530篇
外科学   6608篇
综合类   244篇
现状与发展   14篇
一般理论   6篇
预防医学   6830篇
眼科学   708篇
药学   769篇
中国医学   8篇
肿瘤学   4820篇
  2024年   257篇
  2023年   2396篇
  2022年   594篇
  2021年   1238篇
  2020年   2475篇
  2019年   953篇
  2018年   3046篇
  2017年   3283篇
  2016年   3712篇
  2015年   3817篇
  2014年   4780篇
  2013年   5481篇
  2012年   1771篇
  2011年   1918篇
  2010年   3163篇
  2009年   4228篇
  2008年   1870篇
  2007年   1456篇
  2006年   1843篇
  2005年   1260篇
  2004年   1054篇
  2003年   899篇
  2002年   784篇
  2001年   1163篇
  2000年   822篇
  1999年   1067篇
  1998年   1298篇
  1997年   1309篇
  1996年   1304篇
  1995年   1047篇
  1994年   786篇
  1993年   667篇
  1992年   609篇
  1991年   524篇
  1990年   559篇
  1989年   463篇
  1988年   413篇
  1987年   358篇
  1986年   354篇
  1985年   352篇
  1984年   266篇
  1983年   274篇
  1982年   206篇
  1981年   193篇
  1980年   130篇
  1979年   184篇
  1978年   148篇
  1977年   146篇
  1976年   148篇
  1972年   148篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
A novel injectable scaffolding matrix (E-Matrix) has been developed to accelerate wound healing in diabetic foot ulcers. This porcine collagen-derived matrix is designed to mimic tertiary embryonic connective tissue and to stimulate fetal wound repair mechanisms including angiogenesis. In vitro and animal studies have indicated a beneficial effect on tissue growth and an acceptable safety profile. In this report, we describe the initial use of this product in a pilot study of six humans with chronic nonhealing diabetic foot ulcers. A dramatic initial response to injection was seen, with an average wound size reduction of 72% 2 weeks after injection. Randomized trials are underway to define the potential benefit of this new treatment modality for diabetic foot ulcers.  相似文献   
182.
183.
PROBLEM: To compare depressive symptoms in children with attention deficit hyperactivity disorder (ADHD) to those in healthy children, and to explore the influence of individual and family factors on level of depression. METHODS: Individual interviews with 68 children, ages 7 to 12 years, in order to complete the Children's Depression Inventory. FINDINGS: Children with ADHD reported significantly more depressive symptoms than did children without ADHD; 14.7% of children with ADHD reached the threshold of a 19 point score, which suggests clinical depression. No significant effects of individual and family factors on level of depression were found. CONCLUSIONS: Children with ADHD are more inclined to experience depressive symptoms than are healthy children. To plan appropriate interventions, nurses evaluating and working with children with ADHD should always consider a possible coexistence of depressive symptoms.  相似文献   
184.
185.
Part III of this series of articles, like Part II, reviews the pioneering efforts in the 19th century to improve the quality of artificial teeth. The focus of this article, unlike that of Part II, is specifically modifications in the design of the occlusal anatomy of the 19th century denture teeth, along with the theories of mandibular movement that inspired those modifications. This article concludes the introductory phase of this project, which seeks to unravel the confusing history of the development of (posterior) denture teeth.  相似文献   
186.
187.
This study examined the use and effectiveness of the Alert assessment form. The form is part of the Alert system, used by one large acute care hospital to identify patients with a propensity for violence. All reported incidents of patient violence from August 1, 2003, through December 31, 2004, were included in patient charts. One hundred seventeen violent patient charts were reviewed and compared with 161 non-violent patient charts, randomly chosen from the same time period. Overall use of the Alert assessment form for violent and non-violent patients was 75.7% and 35.4%, respectively. The assessment form was found to have moderate sensitivity (71%) and high specificity (94%). It is reasonably effective in identifying potentially violent or aggressive patients when it is used according to protocol. Efforts to improve the tool are warranted, as is evaluation of its benefit in settings with low prevalence of violence. Also, greater effort must be taken to prevent violence once an aggressive patient has been identified.  相似文献   
188.
189.
Phonetics, esthetics, function, and comfort form the foundation of a successful dental prosthesis. A review of the mechanics of speech as well as common speech problems encountered with a removable maxillary prosthesis are presented. The use of a palatogram to aid the clinician in the assessment and resolution of speech problems associated with a maxillary denture is demonstrated.  相似文献   
190.
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