全文获取类型
收费全文 | 3279篇 |
免费 | 283篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 22篇 |
儿科学 | 163篇 |
妇产科学 | 46篇 |
基础医学 | 408篇 |
口腔科学 | 83篇 |
临床医学 | 463篇 |
内科学 | 690篇 |
皮肤病学 | 56篇 |
神经病学 | 172篇 |
特种医学 | 314篇 |
外科学 | 308篇 |
综合类 | 46篇 |
一般理论 | 1篇 |
预防医学 | 335篇 |
眼科学 | 45篇 |
药学 | 233篇 |
中国医学 | 3篇 |
肿瘤学 | 177篇 |
出版年
2021年 | 22篇 |
2020年 | 19篇 |
2019年 | 40篇 |
2018年 | 54篇 |
2017年 | 37篇 |
2016年 | 40篇 |
2015年 | 57篇 |
2014年 | 73篇 |
2013年 | 96篇 |
2012年 | 123篇 |
2011年 | 128篇 |
2010年 | 86篇 |
2009年 | 105篇 |
2008年 | 134篇 |
2007年 | 125篇 |
2006年 | 143篇 |
2005年 | 144篇 |
2004年 | 103篇 |
2003年 | 130篇 |
2002年 | 107篇 |
2001年 | 98篇 |
2000年 | 81篇 |
1999年 | 79篇 |
1998年 | 83篇 |
1997年 | 93篇 |
1996年 | 83篇 |
1995年 | 70篇 |
1994年 | 70篇 |
1993年 | 68篇 |
1992年 | 61篇 |
1991年 | 59篇 |
1990年 | 50篇 |
1989年 | 78篇 |
1988年 | 85篇 |
1987年 | 68篇 |
1986年 | 74篇 |
1985年 | 67篇 |
1984年 | 40篇 |
1983年 | 46篇 |
1982年 | 36篇 |
1981年 | 31篇 |
1980年 | 32篇 |
1979年 | 29篇 |
1978年 | 26篇 |
1977年 | 32篇 |
1976年 | 31篇 |
1975年 | 43篇 |
1974年 | 16篇 |
1973年 | 20篇 |
1970年 | 21篇 |
排序方式: 共有3565条查询结果,搜索用时 734 毫秒
1.
Lorraine Greaves Nancy Poole Natalie Hemsing 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》2019,48(1):90-98
Rates of smoking during pregnancy remain high in Canada, and cessation rates are low among women who are younger than 24 years and who are socially disadvantaged, that is, have few social and economic resources because of poverty, violence, or mental health issues. On the basis of findings from literature reviews and consultation with policy makers, we developed and operationalized four approaches that can be used by health care providers to tailor interventions for tobacco use in pregnancy. These four approaches are woman centered, trauma informed, harm reducing, and equitable. Public health initiatives that address smoking in young and socially disadvantaged women could be more sharply focused by shifting to such tailored approaches that are grounded in social justice aims, span pre- and postpregnancy periods, and can be used to address women’s social contexts and concerns. 相似文献
2.
3.
4.
Preliminary evidence for a role of apolipoprotein E alleles in identifying haemodialysis patients at high vascular risk 总被引:1,自引:0,他引:1
Olmer M; Renucci JE; Planells R; Bouchouareb D; Purgus R 《Nephrology, dialysis, transplantation》1997,12(4):691-693
Conventional risk factors have very low predictive power in identifying
haemodialysis patients at high risk of vascular accidents. A role for
apolipoprotein E isotypes was looked for in a small, but rigorously
defined, cohort of longterm haemodialysis patients. In individuals with
high vascular risk, as identified by higher common carotid intima/media
thickness, we found an excess of apolipoprotein E4 alleles. This
preliminary result requires confirmation in large patient cohorts.
相似文献
5.
Chondrons were isolated from human and canine osteoarthritic cartilage using low-speed homogenization techniques. Changes in chondron morphology were evaluated using differential interference-contrast microscopy, phase-contrast microscopy, and histochemical and ultrastructural methods. Chondrocyte viability was assessed using fluorescein diacetate staining, and chondron metabolism was investigated using autoradiography. The results suggest that initial changes in the collagen and proteoglycan distribution within the chondron are followed by chondrocyte proliferation to form clusters. These techniques offer the potential to study cell matrix interactions in degenerative osteoarthritis. 相似文献
6.
7.
8.
D C Poole 《Medicine and science in sports and exercise》1986,18(6):703-705
9.
10.
Melissa Hurwitz Manuel G Garcia Robert L Poole John A Kerner 《Nutrition in clinical practice》2004,19(3):305-308
The standard of care for patients with cholestasis (direct bilirubin >or=2 mg/dL) while receiving parenteral nutrition (PN) solutions is to reduce or discontinue the copper and manganese. The repercussions of this action have not been studied. Two adult case reports document low serum copper levels associated with clinical symptoms of copper deficiency after the removal of copper from their PN solutions. We now describe the first known series of pediatric patients to develop copper deficiency after copper was removed from their PN solutions. 相似文献