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   23387篇
  免费   1961篇
  国内免费   46篇
耳鼻咽喉   237篇
儿科学   903篇
妇产科学   605篇
基础医学   3051篇
口腔科学   658篇
临床医学   2956篇
内科学   4520篇
皮肤病学   316篇
神经病学   2089篇
特种医学   931篇
外科学   3246篇
综合类   380篇
一般理论   43篇
预防医学   2198篇
眼科学   345篇
药学   1403篇
  1篇
中国医学   16篇
肿瘤学   1496篇
  2022年   155篇
  2021年   357篇
  2020年   279篇
  2019年   397篇
  2018年   458篇
  2017年   427篇
  2016年   416篇
  2015年   517篇
  2014年   670篇
  2013年   882篇
  2012年   1149篇
  2011年   1237篇
  2010年   717篇
  2009年   654篇
  2008年   1111篇
  2007年   1195篇
  2006年   1112篇
  2005年   1099篇
  2004年   965篇
  2003年   956篇
  2002年   817篇
  2001年   650篇
  2000年   635篇
  1999年   523篇
  1998年   268篇
  1997年   224篇
  1996年   229篇
  1995年   230篇
  1994年   205篇
  1993年   179篇
  1992年   475篇
  1991年   462篇
  1990年   437篇
  1989年   432篇
  1988年   400篇
  1987年   357篇
  1986年   307篇
  1985年   378篇
  1984年   288篇
  1983年   261篇
  1982年   162篇
  1979年   211篇
  1978年   182篇
  1977年   152篇
  1976年   148篇
  1975年   159篇
  1974年   158篇
  1973年   197篇
  1972年   159篇
  1971年   142篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
By focusing on quality of life through education and ongoing support, the pulmonary rehabilitation staff at Little Company of Mary Hospital in Torrance, Calif, gives hope to respiratory patients and teaches them to become partners in the management of their disease.  相似文献   
82.
83.
This article examines the outcomes of participation in mental health Consumer/Survivor Initiatives (CSIs) and identifies helpful qualities of CSIs through a longitudinal, qualitative study that involved in‐depth interviews of people who experienced severe mental health challenges in Ontario, Canada. We used a nonequivalent control group design in which we compared active participants in CSIs ( n = 15) with nonactive participants ( n = 12) at baseline and at 9‐ and 18‐month follow‐up intervals. Compared with non‐CSI participants, CSI participants reported more stable mental health, enhanced social support, sustained work, stable income, and participation in education and training at 9‐ and 18‐month interviews. The helpful qualities of CSIs that participants reported were (1) safe environments that provide a positive, welcoming place to go; (2) social arenas that provide opportunities to meet and talk with peers; (3) an alternative worldview that provides opportunities for members to participate and contribute; and (4) effective facilitators of community integration that provide opportunities to connect members to the community at large. The findings are discussed in terms of previous research in self‐help and consumer‐run organizations in mental health. © 2006 Wiley Periodicals, Inc.  相似文献   
84.
85.
86.
87.
Nitric oxide (NO) inhibitors reduce the threshold for anaesthesia. We have investigated the action of anaesthetic agents on human nitric oxide synthase (NOS) activity. Thiopentone reduced mean NOS activity to 36.6 (SD 8.9) % of control at 100 mumol litre-1 (P < 0.001) and 50.9 (20.3) % at 1 mmol litre-1 (P < 0.05). Ketamine showed similar effects, with activity reduced to 67.0 (17.6) % (P < 0.05) and 57.7 (8.5) % (P < 0.001) at 100 mumol litre-1 and 1 mmol litre-1, respectively. Etomidate 100 mumol litre-1 did not significantly alter activity (88.2 (8.1) %) but 1 mmol litre-1 did (60.6 (10.4) %, P < 0.005). Halothane also caused a significant decrease in NOS activity at all concentrations. This effect was specific as other enzymes were unaffected. We conclude that anaesthetic agents have a profound effect on NOS activity and as inhibition of NO release augments anaesthesia, we suggest that this may play a role in the mechanism of anaesthesia in humans.   相似文献   
88.
Nine years after the beginning of the epidemic of freebase (crack) cocaine abuse in the Bahamas, this historical study was done to characterize the natural course of the epidemic and to estimate the effectiveness of control measures. The authors' data include the incidence of new cases at the only psychiatric hospital in the Bahamas and at the primary community psychiatric clinic in the nation. The Bahamian response included 1) demand reduction, 2) supply reduction, and 3) reduction of money laundering. The annual number of new cases of crack abuse presenting for treatment declined from 1987 to mid-1991 in both facilities, but in 1992 it began rising again in the inpatient setting only. The changes in recent years have been accompanied by an increase in violent crimes against persons, especially robberies. (American Journal on Addictions 1994; 3:14–24)  相似文献   
89.
90.
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