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   2402432篇
  免费   174458篇
  国内免费   4449篇
耳鼻咽喉   32507篇
儿科学   77022篇
妇产科学   64016篇
基础医学   353945篇
口腔科学   64709篇
临床医学   215958篇
内科学   469858篇
皮肤病学   52591篇
神经病学   190110篇
特种医学   89862篇
外国民族医学   491篇
外科学   361222篇
综合类   49605篇
现状与发展   13篇
一般理论   853篇
预防医学   185481篇
眼科学   55059篇
药学   179115篇
  19篇
中国医学   5552篇
肿瘤学   133351篇
  2021年   20992篇
  2019年   20906篇
  2018年   28673篇
  2017年   21671篇
  2016年   24198篇
  2015年   27373篇
  2014年   38350篇
  2013年   56655篇
  2012年   78477篇
  2011年   83257篇
  2010年   49269篇
  2009年   46686篇
  2008年   77903篇
  2007年   82685篇
  2006年   83210篇
  2005年   80572篇
  2004年   76934篇
  2003年   73925篇
  2002年   71347篇
  2001年   109469篇
  2000年   112098篇
  1999年   94190篇
  1998年   27417篇
  1997年   24017篇
  1996年   24413篇
  1995年   23000篇
  1994年   21127篇
  1993年   19923篇
  1992年   72363篇
  1991年   70400篇
  1990年   68718篇
  1989年   65977篇
  1988年   60556篇
  1987年   59378篇
  1986年   55467篇
  1985年   53193篇
  1984年   39494篇
  1983年   33553篇
  1982年   19944篇
  1979年   35996篇
  1978年   25731篇
  1977年   21307篇
  1976年   20400篇
  1975年   21870篇
  1974年   26239篇
  1973年   24879篇
  1972年   23276篇
  1971年   22105篇
  1970年   20311篇
  1969年   19384篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
52.
53.
54.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
55.
Graefe's Archive for Clinical and Experimental Ophthalmology - To evaluate the long-term safety and efficacy of intrastromal bevacizumab for treatment of deep corneal neovascularization in...  相似文献   
56.
57.
To evaluate the changes in alveolar contour after guided bone regeneration (GBR) with two different combinations of biomaterials in dehiscence defects arou  相似文献   
58.
59.
Objective: Polyunsaturated fatty acids n-3 (PUFA n-3) have shown effects in reducing tumor growth, in particular eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) abundantly present in fish oil (FO). When these fatty acids are provided in the diet, they alter the functions of the cells, particularly in tumor and immune cells. However, the effects of α-linolenic fatty acid (ALA), which is the precursor of EPA and DHA, are controversial. Thus, our objective was to test the effect of this parental fatty acid. Methods: Non-tumor-bearing and tumor-bearing Wistar rats (70 days) were supplemented with 1 g/kg body weight of FO or Oro Inca® (OI) oil (rich in ALA). Immune cells function, proliferation, cytokine production, and subpopulation profile were evaluated. Results: We have shown that innate immune cells enhanced phagocytosis capacity, and increased processing and elimination of antigens. Moreover, there was a decrease in production of pro-inflammatory cytokines (tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6)) by macrophages. Lymphocytes showed decreased proliferation capacity, increased cluster of differentiation 8 (CD8+) subpopulation, and increased TNF-α production. Conclusions: Oil rich in ALA caused similar immune modulation in cancer when compared with FO.  相似文献   
60.
Individuals with sudden unilateral deafness offer a unique opportunity to study plasticity of the binaural auditory system in adult humans. Stimulation of the intact ear results in increased activity in the auditory cortex. However, there are no reports of changes at sub-cortical levels in humans. Therefore, the aim of the present study was to investigate changes in sub-cortical activity immediately before and after the onset of surgically induced unilateral deafness in adult humans. Click-evoked auditory brainstem responses (ABRs) to stimulation of the healthy ear were recorded from ten adults during the course of translabyrinthine surgery for the removal of a unilateral acoustic neuroma. This surgical technique always results in abrupt deafferentation of the affected ear. The results revealed a rapid (within minutes) reduction in latency of wave V (mean pre = 6.55 ms; mean post = 6.15 ms; p < 0.001). A latency reduction was also observed for wave III (mean pre = 4.40 ms; mean post = 4.13 ms; p < 0.001). These reductions in response latency are consistent with functional changes including disinhibition or/and more rapid intra-cellular signalling affecting binaurally sensitive neurons in the central auditory system. The results are highly relevant for improved understanding of putative physiological mechanisms underlying perceptual disorders such as tinnitus and hyperacusis.  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