首页 | 官方网站   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   1338631篇
  免费   114854篇
  国内免费   6365篇
医药卫生   1459850篇
  2018年   13420篇
  2017年   10680篇
  2016年   12828篇
  2015年   14342篇
  2014年   20008篇
  2013年   29827篇
  2012年   36346篇
  2011年   39015篇
  2010年   24437篇
  2009年   23981篇
  2008年   36481篇
  2007年   38923篇
  2006年   40049篇
  2005年   38654篇
  2004年   36890篇
  2003年   35981篇
  2002年   34016篇
  2001年   66226篇
  2000年   68116篇
  1999年   56759篇
  1998年   16794篇
  1997年   15066篇
  1996年   16059篇
  1995年   16278篇
  1994年   15144篇
  1993年   14184篇
  1992年   47241篇
  1991年   45862篇
  1990年   44083篇
  1989年   41963篇
  1988年   38864篇
  1987年   38185篇
  1986年   35967篇
  1985年   34733篇
  1984年   26411篇
  1983年   22143篇
  1982年   13874篇
  1981年   12462篇
  1980年   11736篇
  1979年   23576篇
  1978年   17043篇
  1977年   14357篇
  1976年   13153篇
  1975年   13717篇
  1974年   16084篇
  1973年   15403篇
  1972年   14186篇
  1971年   13042篇
  1970年   11879篇
  1969年   11109篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
52.
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective...  相似文献   
53.
54.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
55.
56.
57.
58.
59.
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   
60.
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   
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-23

京公网安备 11010802026262号