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   19502篇
  免费   1588篇
  国内免费   45篇
耳鼻咽喉   182篇
儿科学   544篇
妇产科学   616篇
基础医学   2457篇
口腔科学   494篇
临床医学   2142篇
内科学   3933篇
皮肤病学   235篇
神经病学   2056篇
特种医学   776篇
外科学   2690篇
综合类   438篇
一般理论   31篇
预防医学   1823篇
眼科学   402篇
药学   1254篇
中国医学   50篇
肿瘤学   1012篇
  2021年   201篇
  2020年   156篇
  2019年   250篇
  2018年   262篇
  2017年   219篇
  2016年   236篇
  2015年   274篇
  2014年   372篇
  2013年   646篇
  2012年   837篇
  2011年   1008篇
  2010年   537篇
  2009年   490篇
  2008年   925篇
  2007年   978篇
  2006年   1042篇
  2005年   1032篇
  2004年   1000篇
  2003年   955篇
  2002年   969篇
  2001年   437篇
  2000年   467篇
  1999年   450篇
  1998年   253篇
  1997年   225篇
  1996年   225篇
  1995年   214篇
  1994年   167篇
  1993年   163篇
  1992年   356篇
  1991年   341篇
  1990年   309篇
  1989年   305篇
  1988年   311篇
  1987年   298篇
  1986年   295篇
  1985年   286篇
  1984年   277篇
  1983年   213篇
  1982年   218篇
  1981年   193篇
  1980年   178篇
  1979年   201篇
  1978年   187篇
  1977年   161篇
  1976年   115篇
  1975年   136篇
  1974年   154篇
  1973年   139篇
  1972年   117篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
Cognitive Therapy and Research - Despite interest in psychological inflexibility as a marker of suicide risk, no measure of psychological inflexibility specific to SI exists. The present study...  相似文献   
2.
3.
4.
5.
6.
7.
8.
Biopsies from the diseased bones of patients with familial expansile osteolysis (FEO) were examined by light and electron microscopy. Focal concentrations of multinuclear osteoclasts were present, and these contained viral-like microcylindrical inclusions which appeared exclusive to their nuclei. No consistent relationship was found between osteoclast size and the number of osteoclast nuclei containing microcylindrical inclusions. Quantitative histomorphometry showed evidence of increased bone remodelling with high bone cell densities and a decrease of the reversal period in bone remodelling. The lesions contained prominent woven bone and fibrovascular tissue, together with mononuclear cells and adipocytes. Little bone was found in the most radiolucent lesions, which were almost totally occupied by adipocytes and fibrovascular tissue. Serology did not reveal any significant differences between the viral antibody titres of patients and their age- and sex-matched controls. The present study suggests that intranuclear viral-like microcylindrical inclusions of osteoclasts are not a specific feature of Paget's disease, and are found in other disorders of osteoclast function, including pycnodysostosis, osteopetrosis, giant cell tumours, and familial expansile osteolysis.  相似文献   
9.
Anorectal function in the solitary rectal ulcer syndrome   总被引:8,自引:6,他引:2  
The anorectal function of nine patients with solitary rectal ulcer syndrome (SRUS) (5 F: 4 M, median age, 27 (range, 19–41 years) and nine control subjects (5 F: 4 M, median age, 47 (35–66)P<0.01) has been investigated by a new technique that radiologically visualizes the anorectum during voiding of a semisolid contrast medium, while simultaneously measuring intrarectal pressure and anal sphincter EMG activity. A degree of rectal prolapse was demonstrated in eight of the SRUS patients; six of these lesions were clinically occult. Abnormal failure of the anal sphincter to relax on voiding was present in seven of the SRUS patients. These abnormalities resulted in the SRUS patients requiring a greater increase in intrarectal pressure (median, 100 cm water) to void than the control subjects (median, 65 cm water,P<0.01). This combination of high intrarectal pressure and rectal prolapse during straining seems to be the cause of SRUS This work was supported by a grant from the Medical Research Council.  相似文献   
10.
1. Twenty-two patients hospitalized for treatment of depression were treated under conditions simulating those of home treatment. 2. Full doses of nortriptyline, from 100 to 150 mg/day, were started after baseline observations were made. 3. Two patients were dropped from the study, one for orthostatic hypotension, one for an aberrant response to nortriptyline. Two additional patients developed orthostasis which was easily managed. Otherwise no unusual side effects were noted. 4. After six days of treatment, 9 of 20 patients showed significant improvement with an overall reduction in scores on the Hamilton Depression Scale of 49% for the entire group. 5. Using the weight-adjusted dosage schedule, 18 of the 21 patients attained plasma concentrations of nortriptyline within the presumed therapeutic range; however, no clear relationship could be established between plasma concentrations and clinical response. 6. With proper selection of patients, it should be possible to treat at home some patients who currently are considered to require hospitalization.  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