全文获取类型
收费全文 | 234783篇 |
免费 | 15232篇 |
国内免费 | 988篇 |
专业分类
耳鼻咽喉 | 2523篇 |
儿科学 | 5990篇 |
妇产科学 | 4416篇 |
基础医学 | 29294篇 |
口腔科学 | 4322篇 |
临床医学 | 24051篇 |
内科学 | 49560篇 |
皮肤病学 | 3221篇 |
神经病学 | 23655篇 |
特种医学 | 10138篇 |
外国民族医学 | 13篇 |
外科学 | 37019篇 |
综合类 | 2536篇 |
现状与发展 | 1篇 |
一般理论 | 177篇 |
预防医学 | 16515篇 |
眼科学 | 5529篇 |
药学 | 15478篇 |
1篇 | |
中国医学 | 319篇 |
肿瘤学 | 16245篇 |
出版年
2023年 | 1335篇 |
2022年 | 2188篇 |
2021年 | 5331篇 |
2020年 | 3043篇 |
2019年 | 5052篇 |
2018年 | 6049篇 |
2017年 | 4441篇 |
2016年 | 4847篇 |
2015年 | 5730篇 |
2014年 | 8346篇 |
2013年 | 11243篇 |
2012年 | 17274篇 |
2011年 | 18008篇 |
2010年 | 10066篇 |
2009年 | 9310篇 |
2008年 | 15860篇 |
2007年 | 16654篇 |
2006年 | 16196篇 |
2005年 | 16053篇 |
2004年 | 15102篇 |
2003年 | 13785篇 |
2002年 | 13184篇 |
2001年 | 1929篇 |
2000年 | 1429篇 |
1999年 | 2009篇 |
1998年 | 2784篇 |
1997年 | 2212篇 |
1996年 | 1925篇 |
1995年 | 1761篇 |
1994年 | 1528篇 |
1993年 | 1493篇 |
1992年 | 978篇 |
1991年 | 926篇 |
1990年 | 785篇 |
1989年 | 742篇 |
1988年 | 679篇 |
1987年 | 614篇 |
1986年 | 636篇 |
1985年 | 680篇 |
1984年 | 908篇 |
1983年 | 787篇 |
1982年 | 1037篇 |
1981年 | 967篇 |
1980年 | 837篇 |
1979年 | 464篇 |
1978年 | 514篇 |
1977年 | 446篇 |
1976年 | 419篇 |
1975年 | 314篇 |
1974年 | 311篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Jessica K. Perrotte Michael R. Baumann Raymond T. Garza Willie J. Hale 《Ethnicity & health》2020,25(1):47-64
ABSTRACTObjectives: The present study investigated the relationships of enculturation and depressive symptoms with health risk behavior engagement in Mexican-American college students and examined how these relationships differed by gender. Previous research has noted consistent gender differences in health risk behavior (e.g. alcohol use, substance use, and risky sexual behavior) among Latina/os, and emphasized the role of U.S. acculturation in this difference. Research examining the role of heritage cultural retention (i.e. enculturation), and including the added influence of mental health variables, such as depressive symptoms, is currently lacking. This study sought to address this gap.Design: A large sample (N?=?677) of Mexican-American college students from four universities (located in New York, California, Florida, and Texas) completed an online questionnaire assessing health risk behaviors and corresponding variables.Results: We found that males who endorsed more behavioral enculturation and depressive symptoms were more likely to engage in health risk behavior than all others in the sample. Contrary to previous literature, no relationship was found between behavioral enculturation and health risk behavior in females.Conclusion: The current study found behavioral enculturation to be associated with depressive symptoms, and in turn with health risk behaviors among the males in our sample. Additional research will be needed to identify the mechanism underlying the relationship between enculturation and depressive symptoms as well as between depressive symptoms and risky behavior. 相似文献
42.
43.
44.
45.
46.
HIV risk in vulnerable groups such as itinerant male street labourers is often examined via a focus on individual determinants. This study provides a test of a modified Information-Motivation-Behavioral Skills (IMB) model to predict condom use behaviour among male street workers in urban Vietnam. In a cross-sectional survey using a social mapping technique, 450 male street labourers from 13 districts of Hanoi, Vietnam were recruited and interviewed. Collected data were first examined for completeness; structural equation modelling was then employed to test the model fit. Condoms were used inconsistently by many of these men, and usage varied in relation to a number of factors. A modified IMB model had a better fit than the original IMB model in predicting condom use behaviour. This modified model accounted for 49% of the variance, versus 10% by the original version. In the modified model, the influence of psychosocial factors was moderately high, whilst the influence of HIV prevention information, motivation and perceived behavioural skills was moderately low, explaining in part the limited level of condom use behaviour. This study provides insights into social factors that should be taken into account in public health planning to promote safer sexual behaviour among Asian male street labourers. 相似文献
47.
48.
49.
Interaction effects between the 5‐hydroxy tryptamine transporter‐linked polymorphic region (5‐HTTLPR) genotype and family conflict on adolescent alcohol use and misuse
下载免费PDF全文
![点击此处可从《Addiction (Abingdon, England)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
50.