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   1381599篇
  免费   105360篇
  国内免费   4492篇
耳鼻咽喉   17283篇
儿科学   45316篇
妇产科学   37622篇
基础医学   205038篇
口腔科学   36618篇
临床医学   134221篇
内科学   269037篇
皮肤病学   27419篇
神经病学   117237篇
特种医学   49216篇
外国民族医学   366篇
外科学   187930篇
综合类   29050篇
现状与发展   2篇
一般理论   501篇
预防医学   118856篇
眼科学   29754篇
药学   102539篇
  6篇
中国医学   3290篇
肿瘤学   80150篇
  2021年   13104篇
  2019年   13210篇
  2018年   18073篇
  2017年   13701篇
  2016年   14798篇
  2015年   16884篇
  2014年   22987篇
  2013年   34839篇
  2012年   48259篇
  2011年   50948篇
  2010年   29249篇
  2009年   26779篇
  2008年   45841篇
  2007年   48153篇
  2006年   47988篇
  2005年   46181篇
  2004年   43952篇
  2003年   41641篇
  2002年   40235篇
  2001年   61067篇
  2000年   62685篇
  1999年   52518篇
  1998年   14891篇
  1997年   13532篇
  1996年   13299篇
  1995年   12624篇
  1994年   11794篇
  1993年   11052篇
  1992年   41662篇
  1991年   40839篇
  1990年   39510篇
  1989年   37416篇
  1988年   34652篇
  1987年   33757篇
  1986年   32203篇
  1985年   30694篇
  1984年   23112篇
  1983年   19653篇
  1982年   11823篇
  1979年   20832篇
  1978年   14843篇
  1977年   12098篇
  1976年   11898篇
  1975年   12125篇
  1974年   14819篇
  1973年   14490篇
  1972年   13368篇
  1971年   12427篇
  1970年   11493篇
  1969年   10418篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
41.
42.
Background: Lay belief systems about the malleability of human attributes have been shown to impact behavior change in multiple domains. Addiction mindset—i.e., beliefs about the permanence (vs. malleability) of addiction — may affect cigarette smokers’ ability to quit, but this has never been examined. Objectives: The aims of the present research were to develop a measure of addiction mindset (study 1) and examine its associations with various psychological aspects of quitting smoking (study 2). Methods: In Study 1, using factor analysis of current smokers’ and nonsmokers’ (n?=?600) responses to 22 items designed to measure addiction mindset, we developed a reliable six-item Addiction Mindset Scale (AMS). In Study 2, adult smokers (n?=?200) completed the AMS, and measures of a number of psychological processes related to smoking. Results: Higher scores on the AMS, indicative of the belief that addiction is malleable (referred to as a growth mindset), were positively and significantly associated with greater motivation to quit, greater commitment to quitting, greater self-efficacy to abstain, less attribution of failure to lack of ability to change addiction, and fewer self-reported barriers to cessation (all p’s < .05). Conclusions: The results of this study show a relationship between the beliefs about the permanence of addiction and psychological processes relevant to quitting smoking. The findings underscore the potential of future research exploring how addiction mindsets relate to successful smoking cessation as well as other types of addictive behavior and how they can be applied to change people’s behavior.  相似文献   
43.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
44.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
45.
46.
47.
48.
49.
50.
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