全文获取类型
收费全文 | 1290315篇 |
免费 | 101260篇 |
国内免费 | 3064篇 |
专业分类
耳鼻咽喉 | 18492篇 |
儿科学 | 44522篇 |
妇产科学 | 35126篇 |
基础医学 | 183650篇 |
口腔科学 | 33900篇 |
临床医学 | 113079篇 |
内科学 | 260368篇 |
皮肤病学 | 28163篇 |
神经病学 | 101123篇 |
特种医学 | 51684篇 |
外国民族医学 | 665篇 |
外科学 | 197915篇 |
综合类 | 29422篇 |
现状与发展 | 5篇 |
一般理论 | 378篇 |
预防医学 | 96664篇 |
眼科学 | 28325篇 |
药学 | 96123篇 |
3篇 | |
中国医学 | 3092篇 |
肿瘤学 | 71940篇 |
出版年
2019年 | 9594篇 |
2018年 | 13656篇 |
2017年 | 10381篇 |
2016年 | 11324篇 |
2015年 | 13012篇 |
2014年 | 17929篇 |
2013年 | 26854篇 |
2012年 | 36957篇 |
2011年 | 39149篇 |
2010年 | 23504篇 |
2009年 | 22337篇 |
2008年 | 37350篇 |
2007年 | 39928篇 |
2006年 | 40115篇 |
2005年 | 39091篇 |
2004年 | 38099篇 |
2003年 | 36932篇 |
2002年 | 36234篇 |
2001年 | 64345篇 |
2000年 | 66836篇 |
1999年 | 56761篇 |
1998年 | 15394篇 |
1997年 | 13983篇 |
1996年 | 14352篇 |
1995年 | 13618篇 |
1994年 | 12866篇 |
1993年 | 11881篇 |
1992年 | 44677篇 |
1991年 | 43552篇 |
1990年 | 42311篇 |
1989年 | 40177篇 |
1988年 | 36959篇 |
1987年 | 36293篇 |
1986年 | 33671篇 |
1985年 | 32316篇 |
1984年 | 24165篇 |
1983年 | 20273篇 |
1982年 | 11736篇 |
1981年 | 10702篇 |
1979年 | 21348篇 |
1978年 | 14826篇 |
1977年 | 12534篇 |
1976年 | 11694篇 |
1975年 | 12627篇 |
1974年 | 14667篇 |
1973年 | 14121篇 |
1972年 | 12948篇 |
1971年 | 11729篇 |
1970年 | 11053篇 |
1969年 | 10026篇 |
排序方式: 共有10000条查询结果,搜索用时 248 毫秒
51.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered. 相似文献
52.
53.
54.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants. 相似文献
55.
56.
57.
Objective: To assess the effect of electroacupuncture(EA) on expression of cytoskeletal proteins from Sertoli cells(SCs) and spermatogenesis in rats with oligozoospermia of insufficiency of Shen(Kidney)essence syndrome(OIKES).Methods: Twenty healthy male Sprague-Dawley rats were randomly assigned to four groups using a random number table: control,tripterygium glycosides(TG) treatment,sham and EA groups(n=5 in each group).A rat model of OIKES was established by oral gavage with TG.The EA group was treated with TG and received EA at Shenshu(BL 23) and Zusanli(ST 36) acupoints for 20 min,once daily for 30 days,while the sham group received EA at identical acupoints with skin penetration without stimulation.After 30 days,the ?nal body weight and coef?cients for the testis and epididymis were calculated and sperm parameters were measured.Immunohistochemical analyses were performed to detect expression of vimentin and α-tubulin in SCs and proliferating cell nuclear antigen(PCNA) immunoreactivity in germ cells.Apoptosis in germ cells was quanti?ed by the transferase biotin-dUTP nick end labeling assay.Results: Compared with the control group,the final body weight and testis/epididymis coefficients of rats in the TG-treated group were not significantly different,but the sperm count and motility were lower(P0.05).Expressions of vimentin and α-tubulin were also signi?cantly weaker(P0.01).The PCNA immunoreactivity of germ cells was decreased(P=0.059),whereas the apoptotic index of germ cells was increased signi?cantly(P0.01).In contrast,EA at BL 23 and ST 36 acupoints signi?cantly improved the ?nal body weight as well as the sperm count,concentration and motility(P0.01 or P0.05).EA increased expression of vimentin and α-tubulin in SCs markedly,and signi?cantly enhanced PCNA immunoreactivity with decreased apoptosis in germ cells(P0.01 or P0.05).Conclusions: EA at BL 23 and ST 36 acupoints has protective effects on spermatogenesis in rats with OIKES.This effect seems to be achieved by attenuating TG-induced disruption of cytoskeletal protein in SCs. 相似文献
58.
59.
60.