全文获取类型
收费全文 | 4397篇 |
免费 | 238篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 69篇 |
儿科学 | 144篇 |
妇产科学 | 145篇 |
基础医学 | 489篇 |
口腔科学 | 98篇 |
临床医学 | 369篇 |
内科学 | 715篇 |
皮肤病学 | 65篇 |
神经病学 | 205篇 |
特种医学 | 157篇 |
外科学 | 1038篇 |
综合类 | 98篇 |
预防医学 | 445篇 |
眼科学 | 148篇 |
药学 | 181篇 |
中国医学 | 20篇 |
肿瘤学 | 257篇 |
出版年
2023年 | 16篇 |
2022年 | 26篇 |
2021年 | 102篇 |
2020年 | 68篇 |
2019年 | 86篇 |
2018年 | 122篇 |
2017年 | 90篇 |
2016年 | 77篇 |
2015年 | 77篇 |
2014年 | 138篇 |
2013年 | 174篇 |
2012年 | 268篇 |
2011年 | 270篇 |
2010年 | 149篇 |
2009年 | 153篇 |
2008年 | 189篇 |
2007年 | 217篇 |
2006年 | 227篇 |
2005年 | 203篇 |
2004年 | 193篇 |
2003年 | 186篇 |
2002年 | 183篇 |
2001年 | 138篇 |
2000年 | 153篇 |
1999年 | 131篇 |
1998年 | 45篇 |
1997年 | 32篇 |
1996年 | 30篇 |
1995年 | 21篇 |
1994年 | 36篇 |
1993年 | 22篇 |
1992年 | 64篇 |
1991年 | 66篇 |
1990年 | 57篇 |
1989年 | 51篇 |
1988年 | 57篇 |
1987年 | 58篇 |
1986年 | 68篇 |
1985年 | 58篇 |
1984年 | 26篇 |
1983年 | 21篇 |
1979年 | 25篇 |
1978年 | 18篇 |
1976年 | 20篇 |
1974年 | 31篇 |
1973年 | 29篇 |
1972年 | 20篇 |
1971年 | 15篇 |
1970年 | 16篇 |
1969年 | 14篇 |
排序方式: 共有4643条查询结果,搜索用时 15 毫秒
1.
Jennifer L. Brown Lisa B. Haddad Nicole K. Gause Sarah Cordes Cecilia Bess Caroline C. King 《Women & health》2019,59(3):305-317
This study qualitatively examined factors that influenced contraceptive choices in a sample of young, HIV-infected women. Individual qualitative interviews were conducted among 30 vertically and horizontally HIV-infected women (n = 26 African American) from the ages of 14 to 24 years (Mean age = 20.9 years). We recruited sample groups with the following characteristics: (a) current contraceptive/condom use with ≥1 child (n = 11); (b) current contraceptive/condom use with no children (n = 12); and (c) no current contraceptive/condom use with no children (n = 7). A semi-structured interview guide was used to ask participants about factors influencing past and current contraceptive choices. Individual interviews were digitally recorded and transcribed verbatim; analyses to identify core themes were informed by the Grounded Theoretical approach. Young, HIV-infected women did not identify their HIV serostatus or disease-related concerns as influential in their contraceptive decisions. However, they reported that recommendations from health-care providers and input from family and friends influenced their contraceptive choices. They also considered a particular method’s advantages (e.g., menstrual cycle improvements) and disadvantages (e.g., increased pill burden) when selecting a method. Findings suggested that HIV-infected young women’s contraceptive decisions were influenced by factors other than those related to their infection. 相似文献
2.
Mariana Spitz Alexandre Aluízio Costa Machado Rodrigo do Carmo Carvalho Fernanda Martins Maia Monica Santoro Haddad Dagoberto Calegaro Milberto Scaff Egberto Reis Barbosa 《Movement disorders》2006,21(9):1520-1522
We report on 3 patients with pseudoathetosis, which are involuntary, slow, writhing movements due to loss of proprioception. 相似文献
3.
Post-traumatic retinal detachment occurs frequently as a late consequence of progressive vitreous changes, especially following penetrating injuries. Occasionally, it develops soon after the trauma, without preceding proliferative vitreoretinopathy, is based on posterior vitreous detachment and morphologically resembles an idiopathic retinal detachment. It is possible that the posterior vitreous detachment in these cases is encouraged by the presence of intravitreal hemorrhage. 相似文献
4.
Biological fixation of porous-coated implants 总被引:1,自引:0,他引:1
R J Haddad S D Cook K A Thomas 《The Journal of bone and joint surgery. American volume》1987,69(9):1459-1466
5.
6.
R J Haddad S D Cook M R Brinker 《The Journal of bone and joint surgery. British volume》1990,72(1):2-8
We reviewed 134 primary noncemented porous-coated total hip replacements in 125 patients: 64 were DePuy AML prostheses, 20 were Howmedica PCA and 50 were Implant Technology LSF. The prostheses had been in situ for an average of 36 months, 40 months and 24 months respectively. The average pre-operative Harris hip scores were 38.2 for AML, 33.2 for PCA, and 41.0 for the LSF prostheses. The average postoperative scores were 80.7 for AML, 83.8 for the PCA, and 91.5 for LSF. Thigh or groin pain associated with the prosthesis was present in 30% of AML, 30% PCA and 8% of the LSF cases. The clinical and radiographic review showed better early results with the LSF prostheses than the others; this seemed to be related to the implant design, which provided improved initial stability and more physiological transfer of load. 相似文献
7.
8.
9.
Teresa W. Tam Rui Liu John T. Arnason Anthony Krantis William A. Staines Pierre S. Haddad Brian C. Foster 《Journal of ethnopharmacology》2009,126(1):119-126
Aim of the study
Cree traditional medicine is commonly used concomitantly with prescribed drugs to treat health problems related to type II diabetes (T2D) that is endemic in the Cree population. However, the safety of traditional Cree medicines with respect to drug metabolism is unknown.Materials and methods
Seventeen anti-diabetic plant extracts were screened for their potential inhibition of 11 isoforms of the drug-metabolizing cytochrome P450s (CYPs), and flavin-containing monooxygenase 3 (FMO3) in fluorometric plate reader assays. Comparative analyses were conducted to determine if particular extracts were more inhibitory, or if particular enzymes were more inhibited.Results
Many anti-diabetic plant extracts inhibited the CYPs, with CYP2C and 3A isoforms being most prone to inhibition. The order of inhibition for the enzymes by the Cree plant extracts was: 2C19 > 3A7 > 3A5 > 3A4 > 2C9 > 2C8 > FMO3 > 1A2 > 2E1 > 19 > 2D6 > 2B6. Extracts from Rhododendron groenlandicum, Sorbus decora, and Kalmia angustifolia were identified as having strong inhibition towards many CYP isoforms.Conclusion
These findings demonstrate that extracts from most plant species examined have the potential to affect CYP2C- and 3A4-mediated metabolism, and have the potential to affect the bioavailability and pharmacokinetics of conventional and traditional medicines during concomitant use. 相似文献10.
A literature review of autograft and allograft anterior cruciate ligament reconstruction 总被引:3,自引:0,他引:3
Jonathan Marrale Matthew C. Morrissey Fares S. Haddad 《Knee surgery, sports traumatology, arthroscopy》2007,15(6):690-704
Knee anterior cruciate ligament reconstructive surgery has significantly evolved and now includes the option of using an allograft.
This has resulted in numerous studies evaluating the advantages and disadvantages of allografts. The purpose of this literature
review is to evaluate this research and present important findings to allow the selection of the most appropriate graft source
when considering allograft versus autograft reconstruction. 相似文献