首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1399篇
  免费   56篇
  国内免费   6篇
耳鼻咽喉   22篇
儿科学   50篇
妇产科学   32篇
基础医学   164篇
口腔科学   25篇
临床医学   103篇
内科学   333篇
皮肤病学   26篇
神经病学   104篇
特种医学   19篇
外科学   117篇
综合类   37篇
预防医学   98篇
眼科学   41篇
药学   206篇
中国医学   15篇
肿瘤学   69篇
  2023年   10篇
  2022年   34篇
  2021年   72篇
  2020年   30篇
  2019年   32篇
  2018年   46篇
  2017年   42篇
  2016年   35篇
  2015年   39篇
  2014年   56篇
  2013年   91篇
  2012年   116篇
  2011年   122篇
  2010年   50篇
  2009年   38篇
  2008年   73篇
  2007年   58篇
  2006年   58篇
  2005年   59篇
  2004年   48篇
  2003年   35篇
  2002年   51篇
  2001年   27篇
  2000年   33篇
  1999年   40篇
  1998年   11篇
  1997年   6篇
  1996年   3篇
  1994年   3篇
  1992年   20篇
  1991年   17篇
  1990年   21篇
  1989年   12篇
  1988年   9篇
  1987年   4篇
  1986年   5篇
  1985年   4篇
  1984年   5篇
  1983年   3篇
  1982年   5篇
  1981年   3篇
  1980年   4篇
  1979年   2篇
  1977年   2篇
  1975年   2篇
  1974年   6篇
  1972年   6篇
  1970年   2篇
  1969年   2篇
  1968年   2篇
排序方式: 共有1461条查询结果,搜索用时 0 毫秒
11.
12.
Bulletin of Environmental Contamination and Toxicology - An experiment was conducted to study the effects of co-composted products of municipal solid waste (MSW) and pigeon pea biochar (PPB) on...  相似文献   
13.
The practice of allopathic medicine by informal healthcare practitioners (IHPs) is ubiquitous in India. However, a little is known about the patients' experiences and IHPs' perspectives. The core questions guided the present study were (1) why do urban poor approach IHPs for healthcare? (2) what are their experiences of availing services from IHPs? and (3) what are the perspectives of IHPs about their practice with the population they serve? A qualitative research design guided the study. The study was conducted in the Gurugram city of Haryana, India. Nine IHPs and twenty‐seven patients who fit into the pre‐established inclusion criteria were interviewed. The findings of the study underline the structural constrains of healthcare access to the poor in India and the mutual dependencies between IHPs and the urban poor. Three themes were emerged corresponding to the perspectives of IHPs, and five themes were generated, which describes patients' experiences and perspectives of availing treatment. The factors that attract and sustain patients to IHPs are a mixture of socio‐economic aspects, which include poverty, inaccessibility, unaffordability, inefficient public healthcare facilities, and the positive behavioural and treatment attributes of the practitioners. The study implies urgent policy interventions to ensure quality healthcare to urban poor.  相似文献   
14.
Studies from our laboratory have indicated skin cancer chemopreventive effectsof sandalwood oil in CD-1 mice. The purpose of this investigation was to study the skin cancer chemopreventive effects of alpha-santalol, a principal component of sandalwood oil in CD-1 and SENCAR mice. alpha-Santalol was isolated from sandalwood oil by distillation under vacuum and characterized by nuclear magnetic resonance and gas chromatography-mass spectrometry. Chemopreventive effects of alpha-santalol were determined during initiation and promotion phase in female CD-1 and SENCAR mice. Carcinogenesis was initiated with 7,12-dimethylbenz(a)anthracene and promoted with 12-O-tetradecanoylphorbol-13-acetate (TPA). The effects of alpha-santalol treatment on TPA-induced epidermal ornithine decarboxylase (ODC) activity and (3)H-thymidine incorporation in epidermal DNA of CD-1 and SENCAR mice were also investigated. alpha-Santalol treatment during promotion phase delayed the papilloma development by 2 weeks in both CD-1 and SENCAR strains of mice. alpha-Santalol treatment during promotion phase significantly (P < 0.05) decreased the papilloma incidence and multiplicity when compared with control and treatment during initiation phase during 20 weeks of promotion in both CD-1 and SENCAR strains of mice. alpha-Santalol treatment resulted in a significant (P < 0.05) inhibition in TPA-induced ODC activity and incorporation of (3)H-thymidine in DNA in the epidermis of both strains of mice. alpha-Santalol significantly prevents papilloma development during promotion phase of 7,12-dimethylbenz(a)anthracene-TPA carcinogenesis protocol in both CD-1 and SENCAR mice, possibly by inhibiting TPA-induced ODC activity and DNA synthesis. alpha-Santalol could be an effective chemopreventive agent for skin cancer. Additional experimental and clinical studies are needed to investigate the chemopreventive effect of alpha-santalol in skin cancer.  相似文献   
15.
16.
17.
18.
19.
We report the results of a randomized controlled trial of intravenous streptokinase in a subset of patients with unstable angina. Seventy-six patients were admitted with prolonged (more than 20 minutes) angina at rest of less than 3 weeks onset. Fifty-two patients continued to have more than 3 episodes of prolonged angina in 48 hours on medical therapy with metoprolol, isosorbide dinitrate, nifedipine and intravenous nitroglycerin. Forty-eight patients consented to enter the study and were randomized into two groups. The first group, of 24 patients, received 1.5 million units of streptokinase infusion and the second group, also of 24 patients, received a placebo. Pain relief within 48 hours was achieved in 19/24 (79.1%) patients after streptokinase infusion as compared to 9/24 (37.5%) of the controls (P less than 0.05). Approximately 90% (17/19) of patients responding to streptokinase therapy were relieved of chest pain within the first six hours as against none in the controls. The incidence of acute myocardial infarction within six months was 12.5% (3/24) in those receiving streptokinase and 25% (6/24) in the controls. Mortality at six months stood at 8.33% (2/24) in the treated patients and 16.6% (4/24) in the controls. Intravenous streptokinase thus appears to be of benefit in patients with angina at rest of recent onset which does not respond to conventional medical therapy.  相似文献   
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号