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   1696629篇
  免费   123813篇
  国内免费   3785篇
耳鼻咽喉   21743篇
儿科学   55684篇
妇产科学   46171篇
基础医学   241393篇
口腔科学   48754篇
临床医学   151460篇
内科学   333783篇
皮肤病学   38670篇
神经病学   131201篇
特种医学   63922篇
外国民族医学   242篇
外科学   257477篇
综合类   38973篇
现状与发展   4篇
一般理论   532篇
预防医学   124321篇
眼科学   40247篇
药学   123724篇
  7篇
中国医学   4498篇
肿瘤学   101421篇
  2021年   12828篇
  2019年   13556篇
  2018年   19998篇
  2017年   15246篇
  2016年   16646篇
  2015年   18994篇
  2014年   26263篇
  2013年   37994篇
  2012年   52811篇
  2011年   55506篇
  2010年   32832篇
  2009年   30750篇
  2008年   51633篇
  2007年   54885篇
  2006年   55360篇
  2005年   52620篇
  2004年   50825篇
  2003年   48223篇
  2002年   46433篇
  2001年   91812篇
  2000年   93628篇
  1999年   76985篇
  1998年   19734篇
  1997年   17280篇
  1996年   17398篇
  1995年   16752篇
  1994年   15297篇
  1993年   14077篇
  1992年   57386篇
  1991年   55274篇
  1990年   52980篇
  1989年   50756篇
  1988年   46135篇
  1987年   44942篇
  1986年   42232篇
  1985年   39990篇
  1984年   29350篇
  1983年   24912篇
  1982年   13906篇
  1979年   25531篇
  1978年   17576篇
  1977年   14906篇
  1976年   13874篇
  1975年   14565篇
  1974年   17630篇
  1973年   16945篇
  1972年   15673篇
  1971年   14453篇
  1970年   13431篇
  1969年   12517篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Infections due to Penicillium species other than P.marneffei are rare. We identified a boy with X-linked chronic granulomatous disease (X-CGD) with a pulmonary nodule and adjacent rib osteomyelitis caused by Penicillium piceum. The only sign of infection was an elevated sedimentation rate. P. piceum was isolated by fine needle aspirate and from excised infected tissues. Surgical removal and one year of voriconazole treatment were very well tolerated and led to complete recovery. Microbiological, microscopic and molecular studies support the fungal diagnosis. P. piceum should be considered as a relevant pathogen in immunocompromised patients.  相似文献   
62.
63.
64.
65.
66.
67.
Although surgical lung resection could improve prognosis in some patients with multidrug-resistant tuberculosis (MDR-TB), there are no reports on the optimal candidates for this surgery. The aim of the present study was to elucidate the prognostic factors for surgery in patients with MDR-TB. Patients who underwent lung resection for the treatment of MDR-TB between March 1993 and December 2004 were included in the present study. Treatment failure was defined as greater than or equal to two of the five cultures recorded in the final 12 months of treatment being positive, any one of the final three cultures being positive, or the patient having died during treatment. The variables that affected treatment outcomes were identified through univariate and multivariate logistic regression analysis. In total, 79 patients with MDR-TB were included in the present study. The treatment outcomes of 22 (27.8%) patients were classified as failure. A body mass index <18.5 kg x m(-2), primary resistance, resistance to ofloxacin and the presence of a cavitary lesion beyond the range of the surgical resection were associated with treatment failure. Low body mass index, primary resistance, resistance to ofloxacin and cavitary lesions beyond the range of resection are possible poor prognostic factors for surgical lung resection in multidrug-resistant tuberculosis patients.  相似文献   
68.
69.
70.
The purpose of this study is to determine the role of liver biopsy and outcome of patients undergoing donor evaluation for adult-to-adult right hepatic lobe living donor liver transplantation (LDLT). Records of patients presenting for a comprehensive donor evaluation between 1997 and February 2005 were reviewed. Liver biopsy was performed only in patients with risk factors for abnormal histology. Two hundred and sixty patients underwent a comprehensive donor evaluation and 116 of 260 (45%) were suitable for donation, 14 of 260 (5.4%) did not complete evaluation and 130 of 260 (50%) were rejected. Four patients underwent unsuccessful hepatectomy surgery due to discovery of intraoperative abnormalities. Between 1997 and 2001, the acceptance rate of donor candidates (63%) was higher than 2002-2005 (36%), p < 0.0001. Sixty-six of the 150 eligible patients (44%) fulfilled criteria for liver biopsy and 28 of 66 (42%) had an abnormal finding. Less than half of the patients undergoing donor evaluation were suitable donors and the donor acceptance rate has declined over time. A large proportion of the patients undergoing liver biopsy have abnormal findings. Our evaluation process failed to identify 4 of 103 who had aborted donor surgeries.  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