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   1254篇
  免费   343篇
  国内免费   10篇
耳鼻咽喉   13篇
儿科学   29篇
妇产科学   22篇
基础医学   54篇
口腔科学   8篇
临床医学   431篇
内科学   257篇
皮肤病学   27篇
神经病学   293篇
特种医学   107篇
外科学   191篇
综合类   8篇
预防医学   82篇
眼科学   3篇
药学   33篇
肿瘤学   49篇
  2024年   4篇
  2023年   50篇
  2022年   16篇
  2021年   31篇
  2020年   52篇
  2019年   39篇
  2018年   65篇
  2017年   101篇
  2016年   87篇
  2015年   104篇
  2014年   104篇
  2013年   134篇
  2012年   50篇
  2011年   47篇
  2010年   82篇
  2009年   118篇
  2008年   40篇
  2007年   38篇
  2006年   34篇
  2005年   32篇
  2004年   31篇
  2003年   27篇
  2002年   25篇
  2001年   35篇
  2000年   22篇
  1999年   21篇
  1998年   37篇
  1997年   24篇
  1996年   29篇
  1995年   17篇
  1994年   11篇
  1993年   9篇
  1992年   11篇
  1991年   12篇
  1990年   10篇
  1989年   6篇
  1988年   7篇
  1987年   5篇
  1986年   4篇
  1985年   2篇
  1984年   2篇
  1982年   2篇
  1981年   4篇
  1980年   2篇
  1979年   2篇
  1977年   4篇
  1976年   3篇
  1975年   5篇
  1974年   2篇
  1973年   2篇
排序方式: 共有1607条查询结果,搜索用时 323 毫秒
21.
22.
23.
The purpose of this study was to compare the effects of yoga with an active control (nonaerobic exercise) in individuals with prehypertension and stage 1 hypertension. A randomized clinical trial was performed using two arms: (1) yoga and (2) active control. Primary outcomes were 24‐hour day and night ambulatory systolic and diastolic blood pressures. Within‐group and between‐group analyses were performed using paired t tests and repeated‐measures analysis of variance (time × group), respectively. Eighty‐four participants enrolled, with 68 participants completing the trial. Within‐group analyses found 24‐hour diastolic, night diastolic, and mean arterial pressure all significantly reduced in the yoga group (?3.93, ?4.7, ?4.23 mm Hg, respectively) but no significant within‐group changes in the active control group. Direct comparisons of the yoga intervention with the control group found a single blood pressure variable (diastolic night) to be significantly different (P=.038). This study has demonstrated that a yoga intervention can lower blood pressure in patients with mild hypertension. Although this study was not adequately powered to show between‐group differences, the size of the yoga‐induced blood pressure reduction appears to justify performing a definitive trial of this intervention to test whether it can provide meaningful therapeutic value for the management of hypertension.  相似文献   
24.
High rates of sex and drug risk behaviors have been documented among Latino migrant men in the US. Whether these behaviors were established in the migrants’ home countries or were adopted in the US has not been described and has implications for prevention strategies. Quarterly surveys were conducted to gather information on selected sex and drug risk practices of Latino migrant men who arrived in New Orleans after Hurricane Katrina seeking work. Both kappa scores and McNemar’s tests were performed to determine if practice of these behaviors in home country was similar to practice post-emigration to the US. Female sex worker (FSW) patronage, same sex encounters (MSM), and crack cocaine use was more likely to occur post- rather than pre-emigration. Of those who ever engaged in these selected behaviors, most adopted the behavior in the US (i.e., 75.8 % of FSW patrons, 72.7 % of MSM participants, and 85.7 % of crack cocaine users), with the exception of binge drinking (26.8 %). Men who were living with a family member were less likely to adopt FSW patronage OR = 0.27, CI = 0.10–0.76, whereas men who earned >$465 per week were more likely to adopt crack cocaine use OR = 6.29 CI = 1.29, 30.57. Interventions that facilitate the maintenance of family cohesion and provide strategies for financial management may be useful for reducing sex and drug risk among newly arrived migrants.  相似文献   
25.
26.
27.
28.
29.
30.
Multiple sexual partnerships (MSP), both concurrent and serial short gap, are thought to increase the risk of HIV and sexually transmitted infection (STI) acquisition and transmission. In this study we evaluate potential individual and environmental risk factors for engaging in MSP in a cohort of newly arrived Latino migrant men (LMM) in New Orleans, LA, USA. Participants were surveyed at three time points over a nine-month period to examine factors associated with MSP. Of the 113 men, 32.5 % reported ever MSP. In 290 observations, 19.5 % of men had concurrent, and 15.0 % had serial short gap partnerships in at least one interviews. Substance was associated with MSP, OR (95 % CI) 2.00 (1.16, 3.45) whereas belonging to a community organization was found to be protective, OR 0.32 (0.17, 0.59). Interventions to reduce substance use and promote social connection are needed to prevent a potential HIV/STI epidemic in this population.  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