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   1653篇
  免费   118篇
  国内免费   8篇
耳鼻咽喉   7篇
儿科学   139篇
妇产科学   44篇
基础医学   260篇
口腔科学   10篇
临床医学   94篇
内科学   245篇
皮肤病学   28篇
神经病学   105篇
特种医学   31篇
外科学   313篇
综合类   104篇
现状与发展   1篇
预防医学   89篇
眼科学   16篇
药学   141篇
中国医学   4篇
肿瘤学   148篇
  2022年   18篇
  2021年   49篇
  2020年   23篇
  2019年   28篇
  2018年   33篇
  2017年   24篇
  2016年   33篇
  2015年   23篇
  2014年   33篇
  2013年   42篇
  2012年   74篇
  2011年   86篇
  2010年   55篇
  2009年   65篇
  2008年   68篇
  2007年   78篇
  2006年   56篇
  2005年   55篇
  2004年   35篇
  2003年   37篇
  2002年   55篇
  2001年   42篇
  2000年   23篇
  1999年   34篇
  1998年   18篇
  1997年   20篇
  1996年   10篇
  1995年   19篇
  1994年   18篇
  1993年   17篇
  1992年   28篇
  1991年   37篇
  1990年   25篇
  1989年   33篇
  1988年   25篇
  1987年   23篇
  1986年   37篇
  1985年   21篇
  1984年   24篇
  1983年   16篇
  1982年   9篇
  1981年   12篇
  1979年   17篇
  1975年   16篇
  1974年   18篇
  1973年   12篇
  1972年   10篇
  1971年   13篇
  1970年   16篇
  1966年   10篇
排序方式: 共有1779条查询结果,搜索用时 15 毫秒
1.
The aim of this study is to review the literature to find out the exact etiology of anastomotic cancers of colon post resection and differentiate them between a recurrence, second primary, and metastatic disease (local manifestation of systemic disease). Web-based literature search was done, and datas collected. We searched PubMed for papers using the keywords colon cancer recurrence, anastomotic recurrence, and recurrent colon carcinoma. We also searched for systematic review in the same topic. In addition, we used our personal referrence archive. Anastomotic recurrences of colon are postulated to arise due to inadequate margins, tumor implantation by exfoliated cells, altered biological properties of bowel anastomosis, and missed synchronous lesions. Some tumors are unique with repeated recurrence after repeated resection. Duration after primary surgery plays a major role in differentiating recurrent and second primary lesions. Repeated recurrences after repeated resections have to be considered a manifestation of systemic disease or metastatic disease due to the virulence of the disease. A detailed analysis and study of patients with colonic anastomotic lesion are required to differentiate it between a recurrent, a second primary lesion, and a metastatic disease (local manifestation of a systemic disease). The nomenclature is significant to study the survival of these patients, as a second primary lesion will have different survival compared to that of recurrent lesions.  相似文献   
2.
3.
4.
5.
6.

Background and Aims  

As our population ages and life expectancy increases the number of people aged over 80 and more referred for cardiac surgery is growing. This study sought to identify the outcome of aortic valve replacement (AVR) in octogenarians.  相似文献   
7.
1. The present study aimed to determine the feasibility of conducting a 5 year cardiovascular outcome trial of the treatment of 6000 elderly hypertensive patients in Australian general practices. 2. General practitioners (GPs) were invited to participate by mail and personal follow-up. Patient records were reviewed to identify subjects for a blood pressure (BP) screening programme. Blood pressure was measured on three occasions and eligible subjects were included if the average BP was 160 mmHg systolic or 90 mmHg diastolic if systolic BP was 140 mmHg. 3. Seven hundred and forty-one GPs were approached and 89 were enrolled in the study (12% of mail invites and 75% of those receiving a personal contact). In 16 practices where screening was completed, 82 000 records were reviewed to identify 4% patients eligible for screening. Twenty-two per cent of eligible subjects attended screening. Of 1938 subjects screened, 180 (9%) had BP 5=160/90 mmHg. Forty-seven percent of subjects (n = 916) were receiving antihypertensive therapy and 184 (20%) were withdrawn from therapy. One hundred and sixteen (63%) of these subjects had BP return to study entry levels within 6 weeks. Fifty-seven newly diagnosed and 81 previously treated subjects were randomized (7% of the screened population). 4. Based on the high participation rate of GPs, the response rate of patients to attend a BP screening programme and the 7% randomization to screening ratio for entry into the study, the ANBP2 pilot study has demonstrated that it is feasible to recruit subjects from Australian general practices to a cardiovascular outcome trial.  相似文献   
8.
Nine cases of Merkel cell tumour.   总被引:1,自引:0,他引:1       下载免费PDF全文
Merkel cell tumour is an aggressive neuroendocrine neoplasm arising in the dermis. Although only a few hundred cases have been reported worldwide, nine were seen in Nottingham between 1985 and early 1994. The patients were five women and four men age 63-88. One was the first Afro-Caribbean reported to have such a tumour. In no case was the diagnosis made clinically; histological and histochemical examination was necessary. Three of the patients died quickly with metastatic disease. The primary treatment is surgical excision. For advanced disease, radiotherapy is commonly beneficial.  相似文献   
9.
Sera from 130 first trimester pregnant women were tested for their serum antibody level against a naturally occurring serum antigen purified from non-pregnancy sera. IgG and IgM antibody level was measured using enzyme linked immunosorbant assay. Results indicate that patients with multiple abortion (n=26) have significantly (p=0.0029) lower level of IgG antibody and significantly (p=0.0001) higher level of IgM antibodies; against the serum antigen as compared to the patients with successful pregnancies with no history of miscarriage (n=63). Western blot analysis identified the scrum antigen recognized by the IgM antibody as a 24 kDa molecular mass component. These IgG and IgM antibodies may play an important role in the outcome of pregnancy.  相似文献   
10.
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