全文获取类型
收费全文 | 623357篇 |
免费 | 42783篇 |
国内免费 | 3904篇 |
专业分类
耳鼻咽喉 | 7885篇 |
儿科学 | 14581篇 |
妇产科学 | 14564篇 |
基础医学 | 85219篇 |
口腔科学 | 16280篇 |
临床医学 | 54854篇 |
内科学 | 130154篇 |
皮肤病学 | 11857篇 |
神经病学 | 51044篇 |
特种医学 | 22121篇 |
外国民族医学 | 93篇 |
外科学 | 98003篇 |
综合类 | 13360篇 |
现状与发展 | 1篇 |
一般理论 | 381篇 |
预防医学 | 38480篇 |
眼科学 | 15738篇 |
药学 | 47637篇 |
6篇 | |
中国医学 | 2547篇 |
肿瘤学 | 45239篇 |
出版年
2021年 | 7862篇 |
2020年 | 4811篇 |
2019年 | 7875篇 |
2018年 | 10293篇 |
2017年 | 7796篇 |
2016年 | 8332篇 |
2015年 | 9712篇 |
2014年 | 14032篇 |
2013年 | 18896篇 |
2012年 | 27532篇 |
2011年 | 28642篇 |
2010年 | 16521篇 |
2009年 | 15021篇 |
2008年 | 25668篇 |
2007年 | 27361篇 |
2006年 | 27147篇 |
2005年 | 26204篇 |
2004年 | 24663篇 |
2003年 | 23245篇 |
2002年 | 21948篇 |
2001年 | 30326篇 |
2000年 | 30329篇 |
1999年 | 25912篇 |
1998年 | 8162篇 |
1997年 | 6755篇 |
1996年 | 5977篇 |
1995年 | 5534篇 |
1994年 | 4816篇 |
1993年 | 4375篇 |
1992年 | 17267篇 |
1991年 | 15924篇 |
1990年 | 15120篇 |
1989年 | 14911篇 |
1988年 | 13523篇 |
1987年 | 12979篇 |
1986年 | 12034篇 |
1985年 | 11253篇 |
1984年 | 8108篇 |
1983年 | 6703篇 |
1982年 | 4060篇 |
1981年 | 3520篇 |
1980年 | 3159篇 |
1979年 | 6169篇 |
1978年 | 4076篇 |
1977年 | 3599篇 |
1975年 | 3103篇 |
1974年 | 3532篇 |
1973年 | 3262篇 |
1972年 | 3168篇 |
1971年 | 3042篇 |
排序方式: 共有10000条查询结果,搜索用时 609 毫秒
131.
132.
133.
134.
Lonnie Embleton Juddy Wachira Allan Kamanda Violet Naanyu David Ayuku 《Culture, health & sexuality》2016,18(3):337-348
Street-connected youth in Kenya are a population potentially at risk of HIV transmission, yet little is known about their perceptions and experiences of sexually transmitted infections (STIs), despite their living in an HIV endemic region. We sought to elucidate the language and sociocultural factors rooted in street life that impact on street-connected young people’s knowledge of and perceptions about the prevention and transmission of STIs, and their diagnosis and treatment, using qualitative methods in western Kenya. We conducted a total of 25 in-depth interviews and 5 focus-group discussions with 65 participants aged 11–24 years in Eldoret, Kenya. Thematic analysis was conducted and data were coded according to themes and patterns emergent until saturation was reached. In general, street-connected young people knew of STIs and some of the common symptoms associated with these infections. However, there were many misconceptions regarding transmission and prevention. Gender inequities were prominent, as the majority of men described women as individuals who spread STIs due to unhygienic practices, urination and multiple partners. Due to misconceptions, gender inequity and lack of access to youth-friendly healthcare there is an urgent need for community-based organisations and healthcare facilities to introduce or augment their adolescent sexual and reproductive health programmes for vulnerable young people. 相似文献
135.
136.
137.
138.
David Simon Koray Tascilar Sara Unbehend Sara Bayat Andreas Berlin Anna-Maria Liphardt Timo Meinderink Juergen Rech Axel J Hueber Georg Schett Arnd Kleyer 《Journal of bone and mineral research》2020,35(9):1695-1702
The impact of primary hand osteoarthritis (HOA) on bone mass, microstructure, and biomechanics in the affected skeletal regions is largely unknown. HOA patients and healthy controls (HCs) underwent high-resolution peripheral quantitative computed tomography (HR-pQCT). We measured total, trabecular, and cortical volumetric bone mineral densities (vBMDs), microstructural attributes, and performed micro–finite element analysis for bone strength. Failure load and scaled multivariate outcome matrices from distal radius and second metacarpal (MCP2) head measurements were analyzed using multiple linear regression adjusting for age, sex, and functional status and reported as adjusted Z-score differences for total and direct effects. A total of 105 subjects were included (76 HC: 46 women, 30 men; 29 HOA: 23 women, six men). After adjustment, HOA was associated with significant changes in the multivariate outcome matrix from the MCP2 head (p < .001) (explained by an increase in cortical vBMD (Δz = 1.07, p = .02) and reduction in the trabecular vBMD (Δz = −0.07, p = .09). Distal radius analysis did not show an overall effect of HOA; however, there was a gender-study group interaction (p = .044) explained by reduced trabecular vBMD in males (Δz = −1.23, p = .02). HOA was associated with lower failure load (−514 N; 95%CI, −1018 to −9; p = 0.05) apparent in males after adjustment for functional status. HOA is associated with reduced trabecular and increased cortical vBMD in the MCP2 head and a reduction in radial trabecular vBMD and bone strength in males. Further investigations of gender-specific changes of bone architecture in HOA are warranted. © 2020 The Authors. Journal of Bone and Mineral Research published by American Society for Bone and Mineral Research. 相似文献
139.
140.