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   1681156篇
  免费   129607篇
  国内免费   7225篇
耳鼻咽喉   21606篇
儿科学   53625篇
妇产科学   44078篇
基础医学   229251篇
口腔科学   44405篇
临床医学   151853篇
内科学   344214篇
皮肤病学   38757篇
神经病学   143836篇
特种医学   70911篇
外国民族医学   309篇
外科学   264712篇
综合类   34666篇
现状与发展   3篇
一般理论   610篇
预防医学   127683篇
眼科学   37061篇
药学   117192篇
  6篇
中国医学   2815篇
肿瘤学   90395篇
  2021年   14130篇
  2019年   14354篇
  2018年   20835篇
  2017年   16298篇
  2016年   19546篇
  2015年   22087篇
  2014年   30038篇
  2013年   43671篇
  2012年   57696篇
  2011年   60517篇
  2010年   36737篇
  2009年   34895篇
  2008年   56348篇
  2007年   60105篇
  2006年   60903篇
  2005年   59842篇
  2004年   56928篇
  2003年   54788篇
  2002年   52164篇
  2001年   72555篇
  2000年   74021篇
  1999年   62586篇
  1998年   20344篇
  1997年   17906篇
  1996年   18392篇
  1995年   18244篇
  1994年   16927篇
  1993年   15896篇
  1992年   49775篇
  1991年   48346篇
  1990年   46462篇
  1989年   44125篇
  1988年   40803篇
  1987年   40067篇
  1986年   37717篇
  1985年   36528篇
  1984年   28125篇
  1983年   23589篇
  1982年   15285篇
  1981年   13776篇
  1980年   12928篇
  1979年   25064篇
  1978年   18343篇
  1977年   15467篇
  1976年   14155篇
  1975年   14912篇
  1974年   17296篇
  1973年   16491篇
  1972年   15170篇
  1971年   14021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.
BACKGROUND Metabolic disturbances including changes in serum calcium,magnesium or phosphate(P) influence the prevalence of type 2 diabetes mellitus(DM).We assessed the importance of serum P in elderly patients with type 2 DM vs nondiabetes mellitus(non-DM) in relation to renal function.AIM To determine the association between serum P and serum glucose or insulin resistance in diabetic and non-diabetic patients.METHODS One hundred-ten subjects with a mean age of 69.02±14.3 years were enrolled.Twenty-nine of the participants had type 2 DM(26.4%).The incidence of hypertension,smoking and receiving vitamin D(vitD) derivates were recorded.The participants were classified by both estimated glomerular filtration rate(eGFR) and albuminuria categories according to the Kidney Disease Improving Global Outcomes 2012 criteria.RESULTS We divided the patients in two groups according to the P cut-off point related to DM value.A comparison between high and low P showed that body mass index30.2±6.3 vs 28.1±4.6(P=0.04),mean glucose 63.6 vs 50.2(P=0.03),uric acid 6.7±1.6 vs 6.09±1.7(P=0.05),mean intact-parathyroid hormone 68.06 vs 47.4(P=0.001),systolic blood pressure 147.4±16.7 vs 140..2±16.1(P=0.02),mean albuminuria 63.2 vs 50.6(P=0.04) and eGFR 45.6±22.1 vs 55.4±21.5(P=0.02)were significantly different.χ~2 tests showed a significant association between high P and DM,hypertension,receiving vitD,smoking and eGFR stage(χ~2=6.3,P=0.01,χ~2=3.9,P=0.03,χ~2=6.9,P=0.009,χ~2=7.04,P=0.01 and χ~2=7.36,P=0.04,respectively).The adjusted model showed that older age,female gender and increased body mass index were significant predictors of type 2 DM when entering the covariates.CONCLUSION High serum P contributes to vascular and metabolic disturbances in elderly patients with type 2 DM and renal impairment.  相似文献   
56.
57.
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   
58.
59.
60.
Advancement in microelectromechanical system has facilitated the microfabrication of polymeric substrates and the development of the novel class of controlled drug delivery devices. These vehicles have specifically tailored three dimensional physical and chemical features which together, provide the capacity to target cell, stimulate unidirectional controlled release of therapeutics and augment permeation across the barriers. Apart from drug delivery devices microfabrication technology’s offer exciting prospects to generate biomimetic gastrointestinal tract models. BioMEMS are capable of analysing biochemical liquid sample like solution of metabolites, macromolecules, proteins, nucleic acid, cells and viruses. This review summarized multidisciplinary application of biomedical microelectromechanical systems in drug delivery and its potential in analytical procedures.  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