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   3632090篇
  免费   272817篇
  国内免费   7974篇
耳鼻咽喉   51418篇
儿科学   114121篇
妇产科学   97345篇
基础医学   512145篇
口腔科学   105528篇
临床医学   331432篇
内科学   701611篇
皮肤病学   78087篇
神经病学   294406篇
特种医学   141904篇
外国民族医学   1084篇
外科学   545195篇
综合类   85303篇
现状与发展   10篇
一般理论   1454篇
预防医学   285460篇
眼科学   87142篇
药学   272642篇
  11篇
中国医学   8849篇
肿瘤学   197734篇
  2021年   29223篇
  2019年   29237篇
  2018年   40865篇
  2017年   31131篇
  2016年   35080篇
  2015年   40582篇
  2014年   56582篇
  2013年   83474篇
  2012年   114615篇
  2011年   120214篇
  2010年   71274篇
  2009年   66687篇
  2008年   111052篇
  2007年   117701篇
  2006年   117976篇
  2005年   114412篇
  2004年   109637篇
  2003年   104648篇
  2002年   101862篇
  2001年   167775篇
  2000年   172921篇
  1999年   145733篇
  1998年   41848篇
  1997年   37226篇
  1996年   36851篇
  1995年   35599篇
  1994年   33201篇
  1993年   30734篇
  1992年   115293篇
  1991年   111650篇
  1990年   107682篇
  1989年   104019篇
  1988年   96065篇
  1987年   94347篇
  1986年   89224篇
  1985年   85095篇
  1984年   64071篇
  1983年   54626篇
  1982年   32419篇
  1979年   59000篇
  1978年   41233篇
  1977年   35066篇
  1976年   32811篇
  1975年   34615篇
  1974年   42580篇
  1973年   40622篇
  1972年   38019篇
  1971年   35080篇
  1970年   32969篇
  1969年   30662篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
41.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
42.
43.
44.
45.
46.
47.
AIM: The innovations for disease management need to be thoroughly evaluated so that their benefits and potential downsides can be compared with the already existing approaches. Endovascular laser (EVL) treatment for varicose veins offers today several advantages over surgical standard stripping. The Italian Endovenous-laser Working Group (IEWG) is a homogeneous group of surgeons and phlebologists who have been using EVL since 1999 and has undertaken to examine EVL in a multicenter study starting from a well defined rationale, with the benefit of a single protocol to use. METHODS: In a cooperative, multicenter, clinical study, 1076 limbs in 1050 patients, mean age of 54.5 years, 241 males and 809 females affected by chronic venous insufficiency (CVI) were considered eligible for surgery and stratified by CEAP classification in a four-year period (January 1999 December 2003). Inclusion criteria were insufficiency of the great and/or small saphenous vein at various levels, beyond those accessory saphenous trunks with incompetence in the saphenofemoral junction. In all cases truncular reflux apparead up on duplex scan examination, with or without associated varicosities. All the patients underwent a surgery on the basis of the clinical assessment. All the centres involved performed treatment in conformity with the Food and Drug Administration (FDA) validated procedure, using an endo-laser venous system kit with a 810-980 nm diode. Duplex scan was performed in all patients after 36 months with very few lost to follow-up cases. RESULTS: In the immediate postoperative period the results have been impressive, with a very effective closure of incompetent great saphenous vein and the other treated varicose veins (the early occlusion rate has been 99%). Major complications have not been detected: in particular, no deep venous thrombosis (DVT) evaluated duplex ultrasound. The patients' acceptability and satisfaction regarding the procedure, have been measured by means of a questionnaire on the quality of life, and the result was 96.7%. After 36 months, the total occusion rate of saphenous trunks has been 97%. CONCLUSIONS: The first important Italian experience with EVL based on preoperative, perioperative and postoperative duplex control and which is also based on the patients' satisfaction at mid/long-term has indicated some advantages over the standard treatment with the stripping method. In terms of reduced postoperative pain, shorter sick leave, a faster resumption of the normal activities, and, in particular, the total absence of DVT, we can conclude that EVL is a good solution for all patients with anatomic and hemodinamic patterns for saphenous vein surgery.  相似文献   
48.
AIM: Cardiovascular risk factors can be present in children and young adults. We previously found abnormal microvascular function in children who had glucose intolerance and insulin resistance. The aim of the present study was to investigate whether they also have abnormalities in left ventricular mass (LVM) and arterial stiffness. METHODS: We measured heart dimensions and LVM using echocardiography, and arterial stiffness using pulse wave analysis in 23 children with good glucose handling (postfeeding glucose: 3.9 to 5 mmol/L) and 21 with poor glucose handling (7.7 to 11.4 mmol/L). RESULTS: The time to pulse reflection was slightly shorter in the poorer glucose handlers (mean+/-SD: 143+/-10 vs 153+/-20 ms, P=0.04), suggestive of increased arterial stiffness. Also in this group, there were significant relationships between intraventricular septal thickness, blood pressure and body mass index, but not in the normal glucose handlers. CONCLUSIONS: We have found that normal children who are in the lowest quintile of glucose tolerance in comparison with their peers are exhibiting the first signs of arterial stiffening. In addition, we have seen the beginnings of a relationship between blood pressure, body mass index and left ventricular enlargement in this group. While these changes may not yet be clinically significant, their emergence might be further evidence of early predisposition to cardiovascular disease.  相似文献   
49.
50.
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