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   2350233篇
  免费   171236篇
  国内免费   3330篇
耳鼻咽喉   32049篇
儿科学   75909篇
妇产科学   62685篇
基础医学   348173篇
口腔科学   63650篇
临床医学   211350篇
内科学   457299篇
皮肤病学   51727篇
神经病学   185270篇
特种医学   88006篇
外国民族医学   489篇
外科学   353871篇
综合类   47510篇
现状与发展   12篇
一般理论   848篇
预防医学   182736篇
眼科学   54325篇
药学   175097篇
  11篇
中国医学   4575篇
肿瘤学   129207篇
  2021年   18981篇
  2019年   19541篇
  2018年   27065篇
  2017年   20358篇
  2016年   22746篇
  2015年   25641篇
  2014年   36096篇
  2013年   53956篇
  2012年   74679篇
  2011年   79412篇
  2010年   47057篇
  2009年   44567篇
  2008年   74610篇
  2007年   79481篇
  2006年   80297篇
  2005年   77777篇
  2004年   74366篇
  2003年   71695篇
  2002年   69364篇
  2001年   108738篇
  2000年   111451篇
  1999年   93494篇
  1998年   26990篇
  1997年   23658篇
  1996年   24054篇
  1995年   22715篇
  1994年   20893篇
  1993年   19712篇
  1992年   72003篇
  1991年   70070篇
  1990年   68392篇
  1989年   65664篇
  1988年   60303篇
  1987年   59127篇
  1986年   55219篇
  1985年   53006篇
  1984年   39312篇
  1983年   33397篇
  1982年   19860篇
  1979年   35867篇
  1978年   25652篇
  1977年   21231篇
  1976年   20333篇
  1975年   21816篇
  1974年   26150篇
  1973年   24805篇
  1972年   23202篇
  1971年   22039篇
  1970年   20248篇
  1969年   19316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.
58.
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   
59.
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   
60.
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