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   1627827篇
  免费   134224篇
  国内免费   4596篇
耳鼻咽喉   21810篇
儿科学   53121篇
妇产科学   46459篇
基础医学   230820篇
口腔科学   47598篇
临床医学   144561篇
内科学   318445篇
皮肤病学   34328篇
神经病学   131523篇
特种医学   65923篇
外国民族医学   492篇
外科学   246567篇
综合类   44470篇
现状与发展   15篇
一般理论   548篇
预防医学   124707篇
眼科学   37136篇
药学   123988篇
  37篇
中国医学   4667篇
肿瘤学   89432篇
  2018年   15809篇
  2016年   13798篇
  2015年   16266篇
  2014年   22278篇
  2013年   32778篇
  2012年   44574篇
  2011年   46914篇
  2010年   27698篇
  2009年   26357篇
  2008年   44263篇
  2007年   46507篇
  2006年   47270篇
  2005年   45846篇
  2004年   44852篇
  2003年   42993篇
  2002年   42033篇
  2001年   76254篇
  2000年   78892篇
  1999年   66953篇
  1998年   18100篇
  1997年   16712篇
  1996年   16554篇
  1995年   16271篇
  1994年   15291篇
  1993年   14360篇
  1992年   55567篇
  1991年   53905篇
  1990年   52633篇
  1989年   50901篇
  1988年   47301篇
  1987年   46617篇
  1986年   44314篇
  1985年   42863篇
  1984年   32049篇
  1983年   27575篇
  1982年   16147篇
  1981年   14444篇
  1980年   13566篇
  1979年   30467篇
  1978年   21067篇
  1977年   17764篇
  1976年   16694篇
  1975年   17574篇
  1974年   21487篇
  1973年   20672篇
  1972年   18855篇
  1971年   17770篇
  1970年   16290篇
  1969年   15268篇
  1968年   13950篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
The co-existence of fungal elements in allergic nasal Polyposis, has given rise to a distinct clinical entity known as ‘Allergic fungal sinusitis ’ (AF’S). Many a time, these fungal elements may not be diagnosed pre-operatively by routine diagnostic nasal endoscopy or CT scan of paranasal sinuses, due to the florid presentation of nasal polyps, which usually obscure the underlying fungal pathology. The diagnosis is often made intra-operatively. The post-operative confirmation of AFS is by histopathology, fungal smear, fungal culture, allergic murin study and fungal specific IgE titres. We report a series often such cases done in our institution, which highlight that AFS should be considered as a differential diagnosis in Sinonasal Polyposis cases, for their effective management.  相似文献   
922.
Hepatic encephalopathy is a reversible state of altered cognition that may occur in patients with acute or chronic liver disease or porto-systemic shunt, and in which known neurological or psychiatric signs may develop. Nitrogenated substances from intestinal digestion reach the brain without being cleared by their passage through the liver due to the presence of porto-systemic shunt. We report two cases of patients with porto-systemic shunt diagnosed with recurrent chronic hepatic encephalopathy refractory to conventional medical treatment. They were satisfactorily treated with shunt embolization using interventionist radiology techniques.  相似文献   
923.
BACKGROUND CONTEXT: The effectiveness of spinal surgery as a treatment option is currently evaluated through the assessment of patient-reported outcomes (PROs). The minimum clinically important difference (MCID) represents the smallest improvement considered worthwhile by a patient. The concept of an MCID is offered as the new standard for determining effectiveness of a given treatment and describing patient satisfaction in reference to that treatment. PURPOSE: Our goal is to review the various definitions of MCID and the methods available to determine MCID. STUDY DESIGN: The primary means of determining the MCID for a specific treatment are divided into anchor-based and distribution-based methods. Each method is further subdivided and examined in detail. METHODS: The overall limitations of the MCID concept are first identified. The basic assumptions, statistical biases, and shortcomings of each method are examined in detail. RESULTS: Each method of determining the MCID has specific shortcomings. Three general limitations in the accurate determination of an MCID have been identified: the multiplicity of MCID determinations, the loss of the patient's perspective, and the relationship between pretreatment baseline and posttreatment change scores. CONCLUSIONS: An ideal means of determining the MCID for a given intervention is yet to be determined. It is possible to develop a useful method provided that the assumptions and methodology are initially declared. Our efforts toward the establishment of a MCID will rely on the establishment of specific external criteria based on the symptoms of the patient and treatment intervention being evaluated.  相似文献   
924.
Exercise advice is a well established component of the conservative management of intermittent claudication. Supervised programmes of exercise remain relatively uncommon and are provided mainly in secondary care. This review outlines the evidence for the effectiveness of different exercise regimens and the relative benefits of exercise therapy, where comparisons have been made with medical therapy, angioplasty and surgery.  相似文献   
925.
926.
927.
928.
Intramedullary implants have decisive advantages in the treatment of femoral fractures in the vicinity of the hip joint: a torque that leads to a less pronounced varus position, implantation in the course of the relevant forces, and primary stability in the case of both stable and unstable fractures. Because of the constant developments in the implants available and the frequent failure to differentiate between stable and unstable fractures, some of the recommendations in the literature seem to contradict each other. However, precise analysis of the literature data show that stable fractures can be adequately treated with any technique, while unstable fractures fall in the domain of nailing systems. Since it is not possible to distinguish unequivocally between stable and unstable fractures, all trochanteric and subtrochanteric femoral fractures should be treated with a cephalomedullary nailing system.  相似文献   
929.
930.
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