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   1661331篇
  免费   134150篇
  国内免费   8693篇
耳鼻咽喉   21315篇
儿科学   49935篇
妇产科学   45224篇
基础医学   228162篇
口腔科学   47055篇
临床医学   146548篇
内科学   343960篇
皮肤病学   39176篇
神经病学   133624篇
特种医学   67263篇
外国民族医学   353篇
外科学   262959篇
综合类   40136篇
现状与发展   3篇
一般理论   475篇
预防医学   121553篇
眼科学   36313篇
药学   120844篇
  6篇
中国医学   4147篇
肿瘤学   95123篇
  2018年   17087篇
  2017年   13383篇
  2016年   15627篇
  2015年   17481篇
  2014年   24572篇
  2013年   35773篇
  2012年   44406篇
  2011年   47233篇
  2010年   29481篇
  2009年   28719篇
  2008年   44153篇
  2007年   47242篇
  2006年   48217篇
  2005年   46177篇
  2004年   43983篇
  2003年   42959篇
  2002年   40701篇
  2001年   89401篇
  2000年   91882篇
  1999年   76597篇
  1998年   21127篇
  1997年   18617篇
  1996年   19194篇
  1995年   19072篇
  1994年   17620篇
  1993年   16464篇
  1992年   61064篇
  1991年   58601篇
  1990年   56383篇
  1989年   54175篇
  1988年   49902篇
  1987年   48745篇
  1986年   45712篇
  1985年   43873篇
  1984年   32521篇
  1983年   27131篇
  1982年   16236篇
  1981年   14384篇
  1980年   13482篇
  1979年   28496篇
  1978年   20100篇
  1977年   17076篇
  1976年   15206篇
  1975年   16123篇
  1974年   18889篇
  1973年   18054篇
  1972年   16814篇
  1971年   15631篇
  1970年   14216篇
  1969年   13483篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
62.
63.
64.
65.
66.
67.
68.
Preimplantation genetic diagnosis (PGD) was originally developed to diagnose embryo-related genetic abnormalities for couples who present a high risk of a specific inherited disorder. Because this technology involves embryo selection, the medical, bioethical, and legal implications of the technique have been debated, particularly when it is used to select features that are not related to serious diseases. Although several initiatives have attempted to achieve regulatory harmonization, the diversity of healthcare services available and the presence of cultural differences have hampered attempts to achieve this goal. Thus, in different countries, the provision of PGD and regulatory frameworks reflect the perceptions of scientific groups, legislators, and society regarding this technology. In Brazil, several texts have been analyzed by the National Congress to regulate the use of assisted reproduction technologies. Legislative debates, however, are not conclusive, and limited information has been published on how PGD is specifically regulated. The country requires the development of new regulatory standards to ensure adequate access to this technology and to guarantee its safe practice. This study examined official documents published on PGD regulation in Brazil and demonstrated how little direct oversight of PGD currently exists. It provides relevant information to encourage reflection on a particular regulation model in a Brazilian context, and should serve as part of the basis to enable further reform of the clinical practice of PGD in the country.  相似文献   
69.
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   
70.
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   
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