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   2393230篇
  免费   186119篇
  国内免费   9789篇
耳鼻咽喉   30646篇
儿科学   78190篇
妇产科学   65442篇
基础医学   339461篇
口腔科学   65910篇
临床医学   225352篇
内科学   474332篇
皮肤病学   52820篇
神经病学   198506篇
特种医学   92311篇
外国民族医学   622篇
外科学   352277篇
综合类   55306篇
现状与发展   3篇
一般理论   838篇
预防医学   200608篇
眼科学   51837篇
药学   172155篇
  11篇
中国医学   4914篇
肿瘤学   127597篇
  2018年   26431篇
  2017年   20374篇
  2016年   23271篇
  2015年   26340篇
  2014年   36567篇
  2013年   55981篇
  2012年   72208篇
  2011年   77250篇
  2010年   46550篇
  2009年   44266篇
  2008年   71233篇
  2007年   75557篇
  2006年   76843篇
  2005年   74260篇
  2004年   70799篇
  2003年   68137篇
  2002年   65351篇
  2001年   109608篇
  2000年   112700篇
  1999年   94590篇
  1998年   28205篇
  1997年   25352篇
  1996年   25946篇
  1995年   25545篇
  1994年   23927篇
  1993年   22426篇
  1992年   77368篇
  1991年   75530篇
  1990年   72885篇
  1989年   69259篇
  1988年   64373篇
  1987年   63093篇
  1986年   59934篇
  1985年   57609篇
  1984年   43897篇
  1983年   37020篇
  1982年   22912篇
  1981年   20462篇
  1980年   19157篇
  1979年   39709篇
  1978年   28768篇
  1977年   23897篇
  1976年   22736篇
  1975年   23472篇
  1974年   28123篇
  1973年   27179篇
  1972年   25117篇
  1971年   23275篇
  1970年   21393篇
  1969年   19808篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
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   
72.
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   
73.
74.
75.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
76.
77.
78.
79.
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   
80.
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