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   6069篇
  免费   401篇
  国内免费   16篇
耳鼻咽喉   28篇
儿科学   196篇
妇产科学   139篇
基础医学   1056篇
口腔科学   67篇
临床医学   684篇
内科学   1126篇
皮肤病学   187篇
神经病学   556篇
特种医学   129篇
外科学   497篇
综合类   79篇
一般理论   4篇
预防医学   778篇
眼科学   170篇
药学   313篇
中国医学   17篇
肿瘤学   460篇
  2023年   48篇
  2022年   56篇
  2021年   155篇
  2020年   86篇
  2019年   118篇
  2018年   154篇
  2017年   122篇
  2016年   147篇
  2015年   160篇
  2014年   217篇
  2013年   323篇
  2012年   402篇
  2011年   487篇
  2010年   261篇
  2009年   244篇
  2008年   423篇
  2007年   370篇
  2006年   396篇
  2005年   428篇
  2004年   349篇
  2003年   340篇
  2002年   299篇
  2001年   58篇
  2000年   49篇
  1999年   44篇
  1998年   60篇
  1997年   51篇
  1996年   44篇
  1995年   41篇
  1994年   39篇
  1993年   46篇
  1992年   32篇
  1991年   25篇
  1990年   25篇
  1989年   18篇
  1988年   24篇
  1987年   12篇
  1986年   14篇
  1985年   20篇
  1984年   23篇
  1983年   19篇
  1982年   23篇
  1981年   13篇
  1980年   15篇
  1979年   12篇
  1978年   12篇
  1976年   15篇
  1975年   23篇
  1974年   14篇
  1973年   17篇
排序方式: 共有6486条查询结果,搜索用时 175 毫秒
71.
Evidence-based practice is an important step in the professional evolution of occupational therapy and also provides the means for state-of-the-art innovative clinical service for clients. An essential step in incorporating innovations and developments into clinical practice is through research utilization. Nine models of research utilization developed in the literature are reviewed and critiqued. These are: (1) the Conduct and Utilization of Research in Nursing (CURN) Project; (2) the Stetler-Marram Model; (3) the University of North Carolina Approach; (4) the Innovation Diffusion Process Model; (5) Killeen's Matrix of Research Activity; (6) the Iowa Model of Research In Practice; (7) the Western Interstate Commission for Higher Education In Nursing Project; (8) the Nursing Child Assessment Satellite Training Project; and (9) the Linkage Model. Research utilization models provide a framework for collaboration and the necessary conditions for research utilization activities to be successful. Copyright © 1999 Whurr Publishers Ltd.  相似文献   
72.
Sexually maturing female rainbow trout were exposed in the laboratory to 0.01 mg/L and 0.02 mg/L hydrogen cyanide (HCN) for 20 days at 10 ±0.5C. Histological sections of ovaries from these fish indicated abnormal cytoplasmic features among oocytes during their early development. Oocytes exposed to cyanide during late development exhibited altered patterns of secondary yolk deposition. Quantitative observations similarly confirm delays in secondary yolk deposition. Exposure of females to 0.02 mg/L HCN during early summer ovarian growth resulted in delayed secondary yolk deposition among 93% of the oocytes when compared with controls. When fish were exposed during mid-summer, the effects were evident at both concentrations with approximately 60% of the oocytes failing to reach the secondary yolk deposition stage at the completion of the experiment. This was further substantiated by potential growth studies which indicated a complete absence of oocytes in the final stages of secondary yolk deposition at both cyanide concentrations as compared with controls which contained 27%. The high frequency of atresia at both concentrations suggested that oocytes unable to produce secondary yolk were resorbed by the ovary through a unique form of atresia. It is also suggested that levels of cyanide as low as 0.01 mg/L have a critical effect upon the process of secondary yolk deposition within the ovary and thus significantly reduce the number of viable eggs.  相似文献   
73.
74.
75.
76.
PURPOSE: A survey of U.S. academic medical centers (AMCs) was conducted to identify the most important and challenging issues in pharmacy residency training. METHODS: A questionnaire addressing program characteristics and residency training concerns was sent electronically to pharmacy directors at 130 AMCs that are members or associate members of the University HealthSystem Consortium (UHC). Residency coordinators for both pharmacy practice and specialized programs were asked to complete the questionnaire, with input from other pharmacists involved in the residency program. Respondents were asked to rate the importance and degree of challenge for all issues on a 5-point Likert scale, where 1 = least important or least challenging and 5 = most important or most challenging. RESULTS: Responses were received from hospitals representing over 60% of all residency positions offered by UHC member hospitals. Recruitment was rated the most important issue (mean importance score, 4.8) facing residency programs in AMCs, but with over 85% of budgeted positions filled, programs appear to be successful in overcoming this concern. The most challenging issue (mean challenge score, 4.2) was compliance with the evaluation and documentation elements of the ASHP Residency Learning System (RLS), a system often used to meet requirements for pharmacy practice residency accreditation. The completion of resident research requirements was ranked as both an important and a challenging issue (mean importance score, 4.5; mean challenge score, 3.9). CONCLUSION: A survey of AMCs showed that they offered a wide variety of pharmacy residency programs and filled most budgeted resident positions. Resident recruitment, the RLS, and research requirements are the most important and challenging residency concerns facing the respondents.  相似文献   
77.
78.
Abstract

Gabrielle Weiss and Lily T. Hechtman, Hyperactive Children Grown Up: Empirical Findings and Theoretical Considerations. New York: Guilford Press, 1986, 367 pp., ISBN 0-89862-66 1-7, $32.50 (US)  相似文献   
79.
BackgroundConventional histological analyses are the gold standard for the study of aneurysms and vascular pathologies in pre-clinical research. Over the past decade, in vivo and ex vivo imaging using multiphoton microscopy have emerged as powerful pre-clinical tools for detailed tissue analyses that can assess morphology, the extracellular matrix (ECM), cell density and vascularisation. Multiphoton microscopy allows for deeper tissue penetration with minor phototoxicity.ObjectiveThe present study aimed to demonstrate the current status of multimodality imaging, including multiphoton microscopy, for detailed analyses of neo-endothelialisation and ECM evolution after flow-diverter stent (FDS) treatment in an experimental rabbit model of aneurysms.MethodsMultiphoton microscopy tools for assessing autofluorescence and second harmonic generation (SHG) signals from biological tissues were used to evaluate the endovascular treatment of intracranial aneurysms in an animal model of aneurysms (pig, rabbit). Results from multiphoton microscopy were compared to those from standard histology, electronic and bright field microscopy.ConclusionsThe present study describes novel evaluation modes based on multiphoton microscopy for visualising tissue morphology (e.g., collagen, elastin, and cells) to qualify and quantify the extent of neo-intimal formation of covered arteries and device integration into the arterial wall using a rabbit model of intracranial aneurysms treated with FDS.  相似文献   
80.

Purpose  

The objective of this qualitative study was to develop the items and support the content validity of the PedsQL™ Sickle Cell Disease Module for pediatric patients with sickle cell disease (SCD).  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