全文获取类型
收费全文 | 201230篇 |
免费 | 2634篇 |
国内免费 | 71篇 |
专业分类
耳鼻咽喉 | 1357篇 |
儿科学 | 7190篇 |
妇产科学 | 3464篇 |
基础医学 | 20173篇 |
口腔科学 | 2162篇 |
临床医学 | 14799篇 |
内科学 | 35677篇 |
皮肤病学 | 1123篇 |
神经病学 | 19310篇 |
特种医学 | 9952篇 |
外国民族医学 | 55篇 |
外科学 | 32388篇 |
综合类 | 2663篇 |
一般理论 | 10篇 |
预防医学 | 20101篇 |
眼科学 | 3488篇 |
药学 | 11242篇 |
中国医学 | 655篇 |
肿瘤学 | 18126篇 |
出版年
2022年 | 195篇 |
2021年 | 385篇 |
2020年 | 233篇 |
2019年 | 390篇 |
2018年 | 22271篇 |
2017年 | 17659篇 |
2016年 | 19825篇 |
2015年 | 1413篇 |
2014年 | 1475篇 |
2013年 | 1790篇 |
2012年 | 8412篇 |
2011年 | 22435篇 |
2010年 | 19595篇 |
2009年 | 12241篇 |
2008年 | 20866篇 |
2007年 | 23144篇 |
2006年 | 2023篇 |
2005年 | 3668篇 |
2004年 | 4805篇 |
2003年 | 5676篇 |
2002年 | 3805篇 |
2001年 | 644篇 |
2000年 | 731篇 |
1999年 | 504篇 |
1998年 | 499篇 |
1997年 | 495篇 |
1996年 | 340篇 |
1995年 | 339篇 |
1994年 | 303篇 |
1993年 | 265篇 |
1992年 | 253篇 |
1991年 | 281篇 |
1990年 | 301篇 |
1989年 | 265篇 |
1988年 | 238篇 |
1987年 | 228篇 |
1986年 | 190篇 |
1985年 | 203篇 |
1984年 | 239篇 |
1983年 | 210篇 |
1982年 | 252篇 |
1981年 | 209篇 |
1980年 | 230篇 |
1979年 | 168篇 |
1978年 | 160篇 |
1976年 | 150篇 |
1975年 | 131篇 |
1974年 | 169篇 |
1938年 | 125篇 |
1932年 | 135篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Inborn errors of the urea cycle are an important cause of hyperammonaemia throughout childhood, and are associated with high morbidity and mortality rates. If they are diagnosed early and treated appropriately, the outcome for affected children is significantly improved. 相似文献
12.
13.
14.
J. Bryan Page 《Journal of urban health》2005,82(3):iii35-iii43
Contemporary discourse contains numerous examples of use of the concept of culture by social and behavioral scientists. Simple reification, where the speaker makes culture into a thing capable of action exemplifies one usage in public discourse. Some quantitative social scientists attempt to characterize people’s cultural identities by means of a single categorical variable, which often “lumps” people into categories such as “Hispanic” or “Black” that in fact have numerous culturally bounded subcategories. Approaches that emphasize cultural process are preferable to those who attempt to categorize; more complex measures of acculturation help investigators to make convincing analyses of circumstances in which health disparities occur. Examples in which investigators make appropriate use of cultural characterizations demonstrate their utility in investigating health disparities in Haitian American women, injecting and noninjecting drug users, Hispanic youth, and adult Hispanics at risk of HIV infection. Focus on culture in the study of health disparities can identify entanglements between structural factors such as poverty and lack of education and cultural factors such as beliefs about health. Qualitative methods coupled with quantitative methods have great potential to improve investigators’ grasp of cultural nuance while capturing the distribution of qualitatively derived behaviors. 相似文献
15.
Guerard W. Byrne Johannes M. Schirmer David N. Fass Sumeet S. Teotia Walter K. Kremers Hui Xu Bashoo Naziruddin Henry D. Tazelaar John S. Logan Christopher G. A. McGregor 《American journal of transplantation》2005,5(5):1011-1020
Microvascular thrombosis is a prominent feature in cardiac delayed xenograft rejection (DXR). We investigated the impact of warfarin or low-molecular-weight heparin (LMWH) anti-coagulation on xenograft function using a heterotopic pig-to-primate model. Donor hearts were from CD46 transgenic pigs and baboon immunosuppression included tacrolimus, sirolimus, anti-CD20 and TPC, an alpha-galactosyl-polyethylene glycol conjugate. Three groups of animals were studied. Group 1 (n = 9) was treated with warfarin, Group 2 (n = 13) with LMWH and Group 3, received no anti-coagulant drugs. The median duration of xenograft function was 20 days (range 3-62 days), 18 days (range 5-109 days) and 15 days (range 4-53 days) in Groups 1 to 3 respectively. Anti-coagulation achieved the targeted international normalized prothrombin ratio (INR) and anti-factor Xa levels consistent with effective in vivo therapy yet, no significant impact on median xenograft function was observed. At rejection, a similar histology of thrombosis and ischemia was apparent in each group and the levels of fibrin deposition and platelet thrombi in rejected tissue was the same. Anti-coagulation with warfarin or LMWH did not have a significant impact on the onset of DXR and microvascular thrombosis. However, a role for specific anti-coagulant strategies to achieve long-term xenograft function cannot be excluded. 相似文献
16.
17.
Pilar Nicolás 《Hereditary cancer in clinical practice》2007,5(3):144-152
The specific characteristics of genetic data lead to ethical-legal conflicts in the framework of genetic diagnosis. Several international organisations, including UNESCO and the Council of Europe, have enacted rules referring to the use of genetic information. This paper discusses possible legal and ethical criteria that could be used in genetic testing. 相似文献
18.
19.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献20.