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   47605篇
  免费   3521篇
  国内免费   151篇
耳鼻咽喉   499篇
儿科学   1477篇
妇产科学   1318篇
基础医学   6625篇
口腔科学   510篇
临床医学   6732篇
内科学   9281篇
皮肤病学   867篇
神经病学   4758篇
特种医学   1031篇
外国民族医学   1篇
外科学   4061篇
综合类   795篇
一般理论   44篇
预防医学   5379篇
眼科学   940篇
药学   3136篇
中国医学   79篇
肿瘤学   3744篇
  2023年   236篇
  2022年   503篇
  2021年   951篇
  2020年   525篇
  2019年   886篇
  2018年   990篇
  2017年   802篇
  2016年   871篇
  2015年   1063篇
  2014年   1436篇
  2013年   2128篇
  2012年   3233篇
  2011年   3387篇
  2010年   1744篇
  2009年   1683篇
  2008年   3024篇
  2007年   3267篇
  2006年   3354篇
  2005年   3297篇
  2004年   3234篇
  2003年   3035篇
  2002年   2801篇
  2001年   566篇
  2000年   470篇
  1999年   522篇
  1998年   554篇
  1997年   464篇
  1996年   422篇
  1995年   392篇
  1994年   299篇
  1993年   338篇
  1992年   319篇
  1991年   315篇
  1990年   277篇
  1989年   281篇
  1988年   288篇
  1987年   239篇
  1986年   231篇
  1985年   221篇
  1984年   249篇
  1983年   242篇
  1982年   286篇
  1981年   200篇
  1980年   211篇
  1979年   155篇
  1978年   146篇
  1977年   131篇
  1976年   114篇
  1975年   107篇
  1974年   111篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Few studies have examined the effects of parental incarceration (PI) on outcomes above and beyond other risk and adverse childhood experiences (ACEs). The objectives of this study were to (1) the associations between PI and mental health problems (attention, externalizing, internalizing, and total behavioral problems) and (2) the mediating role of current socioeconomic status and cumulative ACEs. An observational and cross-sectional design was employed. Analyses included hierarchical multivariable linear regression modeling. The analytic sample included 613 adolescents (11–17?years). On average, youth exposed to PI experienced three times as many ACEs compared with youth unexposed. Youth exposed to PI were more likely to have behavioral problems than their unexposed peers. The main effect for all models was attenuated by current economic hardship as well as exposure to increasing numbers of ACEs. Exposure to PI can be viewed as a marker of accumulative risk for intervention since youth impacted by PI are more likely to experience behavioral difficulties and associated adverse childhood experiences. Due to the associated adversity that impact youth exposed to PI, mental health providers need to be able to identify and screen for symptoms associated with trauma.  相似文献   
4.
5.
6.
7.
ABSTRACT

Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood.  相似文献   
8.
Melanoma is a deadly tumor, which in recent years has been successfully treated with immune checkpoint inhibitors as PD-1/PD-L1 and CTLA-4 inhibitors and targeted therapy as BRAF and MEK inhibitors. However, immunotherapy poses deleterious side effects and pursuit of new therapeutic targets is warranted. As knowledge of tumor immunology advances, such targets are being recognized. C-motif chemokine receptor-5 (CCR5) is a receptor found on immune cells whose effects impact the immune response both to induce inflammation and to activate suppressor cells causing an anti-inflammatory effect. CCR5 is well known as a target for HIV therapy where its blockade is efficient and safe, it is also known that its mutation CCR5delta32 is for the most part non-pathological to its carriers. In oncology, activation of the CCR5 receptor has been observed in high-stage disease and CCR5 blockade has been associated with an increased immune response. In this letter, we build up the rationale to utilize CCR5 as a therapeutic target for metastatic melanoma.  相似文献   
9.
10.
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