全文获取类型
收费全文 | 836篇 |
免费 | 43篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 44篇 |
妇产科学 | 8篇 |
基础医学 | 48篇 |
口腔科学 | 13篇 |
临床医学 | 143篇 |
内科学 | 223篇 |
皮肤病学 | 18篇 |
神经病学 | 31篇 |
特种医学 | 229篇 |
外科学 | 44篇 |
综合类 | 27篇 |
预防医学 | 24篇 |
眼科学 | 18篇 |
药学 | 35篇 |
中国医学 | 2篇 |
肿瘤学 | 30篇 |
出版年
2022年 | 3篇 |
2021年 | 10篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 12篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 14篇 |
2014年 | 14篇 |
2013年 | 24篇 |
2012年 | 13篇 |
2011年 | 20篇 |
2010年 | 27篇 |
2009年 | 24篇 |
2008年 | 17篇 |
2007年 | 47篇 |
2006年 | 9篇 |
2005年 | 14篇 |
2004年 | 12篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 11篇 |
1998年 | 51篇 |
1997年 | 35篇 |
1996年 | 59篇 |
1995年 | 44篇 |
1994年 | 41篇 |
1993年 | 51篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 29篇 |
1989年 | 32篇 |
1988年 | 35篇 |
1987年 | 36篇 |
1986年 | 25篇 |
1985年 | 29篇 |
1984年 | 16篇 |
1983年 | 11篇 |
1982年 | 12篇 |
1981年 | 23篇 |
1980年 | 19篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 15篇 |
1976年 | 8篇 |
1975年 | 10篇 |
1970年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有938条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
G P Gerrits A A Haagen R A De Abreu L A Monnens F J Gabre?ls F J Trijbels A L Theeuwes J M van Baal 《Clinical chemistry》1988,34(7):1439-1442
Disturbances in the metabolism of purines and pyrimidines in neurologically affected patients can be reflected by aberrant concentrations of nucleosides and nucleobases in cerebrospinal fluid (CSF). However, normal values, especially for children at different ages, are lacking. We collected 1000 specimens of CSF from subjects ranging in age from newborn to 18 years, who were undergoing a diagnostic lumbar puncture for several clinical indications. Of these, 78 samples could be used retrospectively as a reference according to our criteria. The analyses were performed with a modified HPLC procedure. None of the substances shows age-dependency except uridine and uric acid. Uridine increases with age, and uric acid increases with age in boys older than 12 years. 相似文献
5.
6.
7.
8.
Identification of the multiple endocrine neoplasia type 1 (MEN1) gene. The European Consortium on MEN1 总被引:10,自引:0,他引:10
Lemmens I; Van de Ven WJ; Kas K; Zhang CX; Giraud S; Wautot V; Buisson N; De Witte K; Salandre J; Lenoir G; Pugeat M; Calender A; Parente F; Quincey D; Gaudray P; De Wit MJ; Lips CJ; Hoppener JW; Khodaei S; Grant AL; Weber G; Kytola S; Teh BT; Farnebo F; Thakker RV 《Human molecular genetics》1997,6(7):1177-1183
9.
10.
Jolinda LD Schram Joost Oude Groeniger Merel Schuring Karin I Proper Sandra H van Oostrom Suzan JW Robroek Alex Burdorf 《Scandinavian journal of work, environment & health》2021,47(2):127
Objective:Using a novel mediation method that presents unbiased results even in the presence of exposure–mediator interactions, this study estimated the extent to which working conditions and health behaviors contribute to educational inequalities in self-rated health in the workforce.Methods:Respondents of the longitudinal Survey of Health, Ageing, and Retirement in Europe (SHARE) in 16 countries were selected, aged 50–64 years, in paid employment at baseline and with information on education and self-rated health (N=15 028). Education, health behaviors [including body mass index (BMI)] and working conditions were measured at baseline and self-rated health at baseline and two-year follow-up. Causal mediation analysis with inverse odds weighting was used to estimate the total effect of education on self-rated health, decomposed into a natural direct effect (NDE) and natural indirect effect (NIE).Results:Lower educated workers were more likely to perceive their health as poor than higher educated workers [relative risk (RR) 1.48, 95% confidence interval (CI) 1.37–1.60]. They were also more likely to have unfavorable working conditions and unhealthy behaviors, except for alcohol consumption. When all working conditions were included, the remaining NDE was RR 1.30 (95% CI 1.15–1.44). When BMI and health behaviors were included, the remaining NDE was RR 1.40 (95% CI 1.27–1.54). Working conditions explained 38% and health behaviors and BMI explained 16% of educational inequalities in health. Including all mediators explained 64% of educational inequalities in self-rated health.Conclusions:Working conditions and health behaviors explain over half of the educational inequalities in self-rated health. To reduce health inequalities, improving working conditions seems to be more important than introducing health promotion programs in the workforce. 相似文献