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   175072篇
  免费   6550篇
  国内免费   330篇
耳鼻咽喉   3138篇
儿科学   6577篇
妇产科学   4528篇
基础医学   24488篇
口腔科学   5024篇
临床医学   13008篇
内科学   31762篇
皮肤病学   4803篇
神经病学   16036篇
特种医学   8898篇
外国民族医学   24篇
外科学   28958篇
综合类   1145篇
一般理论   38篇
预防医学   8479篇
眼科学   4658篇
药学   12074篇
中国医学   372篇
肿瘤学   7942篇
  2023年   788篇
  2021年   1363篇
  2020年   1193篇
  2019年   1401篇
  2018年   2944篇
  2017年   2428篇
  2016年   3354篇
  2015年   3742篇
  2014年   3973篇
  2013年   5590篇
  2012年   8541篇
  2011年   7995篇
  2010年   4742篇
  2009年   3812篇
  2008年   7856篇
  2007年   8721篇
  2006年   8754篇
  2005年   9186篇
  2004年   8739篇
  2003年   8639篇
  2002年   8517篇
  2001年   6358篇
  2000年   6374篇
  1999年   5531篇
  1998年   1633篇
  1997年   1342篇
  1996年   1023篇
  1995年   827篇
  1992年   2446篇
  1991年   2349篇
  1990年   2312篇
  1989年   2165篇
  1988年   1875篇
  1987年   1875篇
  1986年   1729篇
  1985年   1665篇
  1984年   1307篇
  1983年   1037篇
  1979年   1400篇
  1978年   1030篇
  1977年   875篇
  1975年   1097篇
  1974年   1139篇
  1973年   1045篇
  1972年   1042篇
  1971年   1022篇
  1970年   909篇
  1969年   856篇
  1968年   825篇
  1967年   769篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
An increase in chronic beryllium disease (CBD) has been suggested due to higher industrial use of beryllium alloys. Since occupational CBD is a perfect phenocopy of sarcoidosis, it might be misdiagnosed as sarcoidosis. In the current it was hypothesised that CBD exists in cohorts of sarcoidosis patients. In a prospective case study, sarcoidosis patients were evaluated for potential beryllium exposure. In those patients in whom beryllium exposure was confirmed and beryllium hypersensitivity demonstrated, the diagnosis of sarcoidosis was rejected and corrected to CBD. In 84 patients seen for re-evaluation or making a diagnosis of sarcoidosis, beryllium exposure was recognised and a diagnosis of CBD was made in 34 out of 84 patients. The time lag between clinical diagnosis of sarcoidosis and the final diagnosis of CBD ranged 0-18 yrs (median 3 yrs) and the mean (range) age at time of diagnosis of CBD was 43.9(25-80) yrs. Beryllium-contaminated workplaces causing disease encompassed a wide spectrum of industries and technical trades in which beryllium-exposure is generally not perceived as a health hazard. In conclusion, chronic beryllium disease still belongs to the spectrum of differential diagnoses of granulomatous disorders.  相似文献   
44.
During the last 10 years the knowledge about rostral anterior cingulate cortex (ACC) activity in major depression has substantially increased. Several groups have independently described a relationship between resting activity in this area and response to antidepressant treatment. We have recently confirmed a relationship between resting activity of rostral ACC activity and response in a group of 20 patients with major depression using resting theta activity. In this earlier study regions of interest (ROI) were defined in order to establish regional specificity. Differences between responders and nonresponders were only found in the ACC-ROI, but not in the posterior cingulate region. We have now reanalyzed our data using a whole brain voxelwise approach, in order not to miss any other relevant functional differences. In addition to major differences between responders and nonresponders in the rostral ACC, we have identified a nearby region in the midline orbito-frontal region.  相似文献   
45.
Adamantinoma of long bones is one of the rarest of malignant bone tumors; it is commonly located in the middle or lower third of the diaphysis of the tibia. A case with multiple occurrences affecting both the tibia and fibula is presented. En bloc resection with wide operative margins was performed, and a large tibial defect of 23 cm was effectively bridged by a revascularized free fibular flap. At 13 months follow-up, there was no sign of local recurrence or metastasis, and the patient was mobile.  相似文献   
46.
47.
Volume and profile of alcohol consumption among students and classmates as predictors of aggression and victimization: a multilevel analysis among Swiss adolescents

Objective:  

To test the effects of the volume of alcohol consumption and drinking patterns on alcohol-related aggression and victimization, both at the individual and class levels.  相似文献   
48.
Abstract Chorea is a rare complication of polycythaemia vera. Polycythaemic chorea occurs predominantly in females and usually in generalised form. We present a 66-year-old woman with acute onset hemichorea-ballism with no vascular pathology in the basal ganglia region. A clear relationship was observed between the onset of chorea and worsening of haematological parameters in the patient. After repeated phlebotomies the patient's clinical status was improved. Polycythaemic chorea must be considered, especially in the elderly, as early diagnosis leads to effective treatment and prevention of complications.  相似文献   
49.
50.

Background  

Patient falls in hospitals are common and may lead to negative outcomes such as injuries, prolonged hospitalization and legal liability. Consequently, various hospital falls prevention programs have been implemented in the last decades. However, most of the programs had no sustained effects on falls reduction over extended periods of time.  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