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   11010篇
  免费   707篇
  国内免费   41篇
耳鼻咽喉   176篇
儿科学   301篇
妇产科学   159篇
基础医学   1557篇
口腔科学   1034篇
临床医学   786篇
内科学   2460篇
皮肤病学   209篇
神经病学   823篇
特种医学   265篇
外国民族医学   2篇
外科学   1177篇
综合类   48篇
一般理论   3篇
预防医学   1184篇
眼科学   221篇
药学   787篇
中国医学   59篇
肿瘤学   507篇
  2023年   117篇
  2022年   95篇
  2021年   406篇
  2020年   268篇
  2019年   371篇
  2018年   441篇
  2017年   312篇
  2016年   360篇
  2015年   375篇
  2014年   523篇
  2013年   645篇
  2012年   968篇
  2011年   970篇
  2010年   551篇
  2009年   426篇
  2008年   661篇
  2007年   637篇
  2006年   545篇
  2005年   474篇
  2004年   416篇
  2003年   361篇
  2002年   311篇
  2001年   178篇
  2000年   193篇
  1999年   179篇
  1998年   56篇
  1997年   45篇
  1996年   38篇
  1995年   30篇
  1994年   31篇
  1993年   30篇
  1992年   84篇
  1991年   68篇
  1990年   67篇
  1989年   63篇
  1988年   58篇
  1987年   43篇
  1986年   45篇
  1985年   55篇
  1984年   35篇
  1983年   23篇
  1982年   11篇
  1981年   16篇
  1980年   17篇
  1979年   15篇
  1978年   16篇
  1976年   17篇
  1975年   19篇
  1971年   11篇
  1968年   14篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Clinical Oral Investigations - This overview analyzed the quality of the systematic reviews (SRs) available on treatments for molar-incisor hypomineralization (MIH). Six electronic databases were...  相似文献   
3.
4.
Journal of Neuro-Oncology - Cognitive impairment is frequent in patients with high-grade glioma and requires cognitive follow-up. Cognitive screening tools such as the Montreal Cognitive Assessment...  相似文献   
5.
6.
7.
Over 36 million people worldwide are infected with HIV. Antiretroviral therapy (ART) has proven to be highly effective to prevent HIV-1 transmission, clinical progression and death. Despite this success, the number of HIV-1 infected individuals continues increasing and ART should be taken for life. Therefore, there are two main priorities: the development of preventive vaccines to protect from HIV acquisition and achieve an efficient control of HIV infection in the absence of ART (functional cure). In this sense, in the last few years, there has been a broad interest in new and innovative approaches such as mRNA-based vaccines. RNA-based immunogens represent a promising alternative to conventional vaccines because of their high potency, capacity for rapid development and potential for low-cost manufacture and safe administration. Some mRNA-based vaccines platforms against infectious diseases have demonstrated encouraging results in animal models and humans. However, their application is still limited because the instability and inefficient in vivo delivery of mRNA. Immunogens, design, immunogenicity, chemical modifications on the molecule or the vaccine delivery methods are all crucial interventions for improvement. In this review we, will present the current knowledge and challenges in this research field. mRNA vaccines hold great promises as part of a combined strategy, for achieving HIV functional cure.  相似文献   
8.
9.
10.

Objective

Hypertonic saline (HTS) has potent immune and vascular effects. We assessed recipient pretreatment with HTS on allograft function in a porcine model of heart transplantation and hypothesized that HTS infusion would limit endothelial and left ventricular (LV) dysfunction following transplantation.

Methods

Heart transplants were performed after 6 hours of cold ischemic storage. Recipient pigs were randomized to treatment with or without HTS (7.5% NaCl) before cardiopulmonary bypass (CPB). Using a myograft apparatus, coronary artery endothelial-dependent (Edep) and -independent (Eind) relaxation was assessed. LV performance was determined using pressure-volume loop analysis. Pulmonary interleukin (IL)-2, IL-6, and tumor necrosis factor (TNF)-α expression was measured.

Results

Weaning from CPB and LV performance after transplantation were improved in HTS-treated animals. Successful weaning from CPB was greater in the HTS-treated hearts (8 of 8 vs 2 of 8; P < .05). Mean LV functional recovery was improved in the HTS-treated animals, as assessed by preload recruitable stroke work (65 ± 10% vs 27 ± 10%; P < .001) and end-systolic elastance (55 ± 7% vs 37 ± 4%; P < .001). Treatment with HTS resulted in improved Edep (mean maximum elastance [Emax], 56 ± 5% vs 37 ± 7%; P < .001) and Eind (mean Emax%, 77 ± 6% vs 52 ± 4%; P < .001) vasorelaxation compared with control. Pulmonary expression of IL-2, IL-6, and TNF-α increased following transplantation, whereas HTS therapy attenuated IL production (P < .001). Transplantation increased plasma TNF-α levels and LV TNF-α expression, whereas HTS prevented this up-regulation (P < .001).

Conclusions

Recipient HTS pretreatment preserves allograft vasomotor and LV function, and HTS therapy limits CPB-induced injury. HTS may be a novel recipient intervention to prevent graft dysfunction.  相似文献   
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