全文获取类型
收费全文 | 2078篇 |
免费 | 128篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 75篇 |
妇产科学 | 44篇 |
基础医学 | 260篇 |
口腔科学 | 32篇 |
临床医学 | 170篇 |
内科学 | 664篇 |
皮肤病学 | 20篇 |
神经病学 | 208篇 |
特种医学 | 25篇 |
外科学 | 224篇 |
综合类 | 27篇 |
一般理论 | 2篇 |
预防医学 | 142篇 |
眼科学 | 13篇 |
药学 | 163篇 |
中国医学 | 26篇 |
肿瘤学 | 100篇 |
出版年
2023年 | 9篇 |
2022年 | 22篇 |
2021年 | 46篇 |
2020年 | 28篇 |
2019年 | 37篇 |
2018年 | 48篇 |
2017年 | 25篇 |
2016年 | 45篇 |
2015年 | 43篇 |
2014年 | 62篇 |
2013年 | 68篇 |
2012年 | 124篇 |
2011年 | 175篇 |
2010年 | 80篇 |
2009年 | 55篇 |
2008年 | 110篇 |
2007年 | 146篇 |
2006年 | 115篇 |
2005年 | 126篇 |
2004年 | 106篇 |
2003年 | 104篇 |
2002年 | 101篇 |
2001年 | 32篇 |
2000年 | 40篇 |
1999年 | 33篇 |
1998年 | 41篇 |
1997年 | 29篇 |
1996年 | 20篇 |
1995年 | 16篇 |
1994年 | 12篇 |
1993年 | 20篇 |
1992年 | 23篇 |
1991年 | 28篇 |
1990年 | 25篇 |
1989年 | 32篇 |
1988年 | 24篇 |
1987年 | 14篇 |
1986年 | 18篇 |
1985年 | 21篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 5篇 |
1980年 | 6篇 |
1979年 | 10篇 |
1978年 | 5篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 7篇 |
1973年 | 10篇 |
1968年 | 4篇 |
排序方式: 共有2216条查询结果,搜索用时 15 毫秒
1.
Graciela Spivak 《Archives of toxicology》2016,90(11):2583-2594
2.
3.
A case of true conversive hallucinations in a 19-year-old female soldier is described. This phenomenon is rare and should be distinguished from psychotic or dissociative states. 相似文献
4.
Alice J Hausman Ph.D. M.P.H. Howard Spivak M.D. Deborah Prothrow-Stith M.D. James Roeber M.S. 《The Journal of adolescent health》1992,13(8):668-675
This paper describes the implementation of a community-based youth violence prevention project that utilized an educational curriculum and a mass media campaign. The extent of penetration of the intervention into target areas and the degree of contamination of control areas are assessed, and the most frequently contacted forms of educational outreach are identified. Two sources of data, provider interviews and a random digit dialed telephone survey, were used to track the source and extent of teens' exposure to the intervention. Agency provider data revealed that 40% of the 92 contacted agencies actually conducted violence prevention education, reaching 22% of the target area teens. Approximately one-half of the surveyed teens reported some exposure to the program, with 13% of the teens in target areas reporting participation in interactive educational activities associated with the project. The most common source of exposure was the media campaign. Most teens report a single exposure, usually to the media campaign, although 29% report contact with more than one form of violence prevention education. While the project did not achieve community saturation, the data show that the community-based model of intervention for violence prevention is feasible and effective in reaching teenagers. This research highlights some difficulties in evaluating prevention programs, including reconciling community ownership with project identification, the ethics of curtailing services for control purposes, and factors influencing recall of participation. 相似文献
5.
6.
Graciela M P de Souza Waldemar S Costa Homero Bruschini Francisco J B Sampaio 《Annals of anatomy》2004,186(1):55-59
PURPOSE: To investigate the morphological effects of acute overdistension in the structure of the extracellular matrix of the bladder wall in rats. MATERIALS AND METHODS: The bladders of a group of 6 male Wistar rats were transurethrally overdistended for 3 hours. Another identical group (the control group) was only submitted to a sham operation. Specimens from the bladder dome were analyzed with light microscopy (LM), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). RESULTS: LM--The control group bladders had a 4 to 5 layer urothelium, a lamina propria, and a smooth muscle layer with longitudinal and transversal fibers. The overdistended bladders presented an intense interstitial infiltrate in the lamina propria, and a less intense infiltrate among the smooth muscle fibers. TEM--The cells of the overdistended bladders had a significant amount of vacuoles, unlike the control bladders, where such vacuoles were scarce or absent. SEM--A delicate three-dimensional mesh of collagen fibrils was observed in the lamina propria of the bladder walls from the control group. Whilst for the control group this mesh consisted of distinct geometric structures, with mostly circular cellular spaces surrounded by the fibrils, the overdistended group showed evidence of distortion of the mesh, with flattened and elongated cellular spaces. CONCLUSIONS: Acute bladder overdistension induces structural modifications, altering the arrangement and interaction of collagen fibrils, as well as incipient tissue damage as edema in the lamina propria and smooth muscle layers. 相似文献
7.
8.
Davicino Roberto Patricia Micucci Turner Sebastian Ferraro Graciela Claudia Anesini 《Basic & clinical pharmacology & toxicology》2010,106(1):38-44
Abstract: Limonene is a monoterpene present in citrus fruit and is used as flavouring agents of foods. It was shown that monoterpenes possess antioxidant activity. Previously, it was demonstrated that limonene exerts anti‐proliferative action on a lymphoma cell line without modifying normal lymphocyte viability. H2O2 has a modulator role in cell proliferation. In the present study, the effect of limonene on normal lymphocytes proliferation and its relation with H2O2 level modulation was analysed, evaluating its effect on the activity of cell antioxidant enzymes, such as catalase, peroxidase and superoxide dismutase. Limonene exerted a biphasic effect on cell proliferation; the increase in cell proliferation was related to the decrease in H2O2 level by the increase in catalase and peroxidase activities. Moreover, limonene protected the cells to the oxidative stress induced by exogenous addition of H2O2. In view of these results, it is possible that limonene could protect normal lymphocytes from diseases related to oxidative stress, including cancer, but further research is necessary to establish the role of limonene as a potential antioxidant that can effectively protect lymphocytes from oxidative stress and mitochondrial dysfunction. 相似文献
9.
B. Spivak M. Radwan P. Bartur R. Mester A. Weizman 《Acta psychiatrica Scandinavica》1995,92(4):266-269
We determined the presence of antinuclear autoantibodies (ANA), antinative DNA and histone-reactive ANA in 3 groups of chronic schizophrenic patients (n= 85): haloperidol-treated patients (for at least 3 months) (n= 35), drug-free for at least 3 months (n= 35) and neuroleptic-naive patients (n= 15). The autoantibody titers were compared with those of healthy controls (n= 37). A significantly higher frequency of positive ANA was found among chronic schizophrenic patients (~20%) as compared with the controls (~5 %), irrespective of drug treatment, sex and age. No antinative ANA autoantibodies or histone reactive ANA were detected in either schizophrenic patients or controls. Further studies are needed to isolate and characterize in ANA-positive schizophrenic patients 1 a putative specific ANA profile. 相似文献
10.