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   627篇
  免费   23篇
  国内免费   4篇
儿科学   27篇
妇产科学   5篇
基础医学   49篇
口腔科学   32篇
临床医学   47篇
内科学   147篇
皮肤病学   18篇
神经病学   7篇
特种医学   176篇
外科学   41篇
综合类   38篇
预防医学   15篇
眼科学   7篇
药学   15篇
中国医学   1篇
肿瘤学   29篇
  2023年   1篇
  2022年   5篇
  2021年   3篇
  2020年   3篇
  2019年   5篇
  2018年   9篇
  2017年   4篇
  2016年   6篇
  2015年   13篇
  2014年   5篇
  2013年   17篇
  2012年   14篇
  2011年   15篇
  2010年   15篇
  2009年   21篇
  2008年   28篇
  2007年   13篇
  2006年   16篇
  2005年   21篇
  2004年   12篇
  2003年   17篇
  2002年   18篇
  2001年   18篇
  2000年   28篇
  1999年   12篇
  1998年   21篇
  1997年   39篇
  1996年   28篇
  1995年   22篇
  1994年   16篇
  1993年   14篇
  1992年   7篇
  1991年   5篇
  1990年   8篇
  1989年   9篇
  1988年   18篇
  1987年   21篇
  1986年   24篇
  1985年   17篇
  1984年   11篇
  1983年   6篇
  1982年   11篇
  1981年   14篇
  1980年   13篇
  1979年   2篇
  1978年   8篇
  1977年   7篇
  1976年   7篇
  1975年   5篇
  1965年   1篇
排序方式: 共有654条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
PURPOSE: To evaluate rates, predictors, and barriers to use of the Internet to obtain cancer information among a cohort of cancer patients at an urban county hospital. PATIENTS AND METHODS: Of 208 cancer patients approached, 200 patients completed a structured interview study examining Internet use, perceptions of the accuracy of Internet information, and barriers to use. RESULTS: Only 10% of participants reported using the Internet themselves to obtain cancer information. Another 21% reported exposure to Internet information through proxies. The most common barrier to Internet use cited was lack of Internet access, with 44% reporting that they would use the Internet to obtain cancer information if they had Internet access. Younger age and more years of formal education were significantly associated with Internet use, although race and income were not. Less education, African American race, and female sex were associated with lower estimates of the accuracy of Internet information. Fewer years of formal education was associated with increased likelihood of reporting confusion after reading Internet information. CONCLUSION: Very few cancer patients in this study of a cohort of generally disadvantaged individuals used the Internet themselves to obtain cancer information, although many more desired to do so. Significant opportunities for Web-based interventions aimed at improving cancer care outcomes in this population of cancer patients exist. However, further study will be needed to determine how to make such intervention accessible, trustworthy, and understandable to the disadvantaged.  相似文献   
6.
Cholecystokinin-decreased food intake in rhesus monkeys   总被引:1,自引:0,他引:1  
  相似文献   
7.
This study analyses the influence of female and male patient age and human menopausal gonadotrophin (HMG) requirements on clinical pregnancy rates and live birth rates with ovulation stimulation using HMG in combination with intrauterine insemination (IUI). In this study, 363 consecutive HMG/IUI treatment cycles in 184 patients carried out at a university fertility centre were analysed in a retrospective fashion. The main outcomes measured were clinical pregnancy rates and live birth rates. Increased female partner age (> or = 35) and male partner age (> or = 40) were found to negatively influence pregnancy rates with HMG/ IUI therapy. In addition, this study demonstrated a critical threshold of HMG requirements beyond which pregnancy did not occur. No pregnancies occurred in treatment cycles requiring > 25 ampoules (1875 IU) of menotrophins to achieve follicular maturity, irrespective of patient age. In conclusion, female partner age, male partner age, and HMG requirements all significantly influence pregnancy rates with HMG/IUI therapy.   相似文献   
8.
INTRODUCTION: Core biopsy of the breast has become the method of choice for tissue diagnosis of screen detected microcalcifications and some mass lesions in many breast assessment centres. Biopsy results are not available until the following day. Imprint cytology of fresh breast core samples allows same-day reporting and patient counselling.
AIM: To determine the accuracy of core imprint cytology when compared with core biopsy diagnosis when used in a breast assessment centre setting.
METHODS: Core imprints (CI) were prepared and reported on all fresh core biopsies (CB) performed at the Sir Charles Gairdner Hospital Breast Centre from May to December 2000. Fresh core samples were placed on a glass microscope slide. Core radiographs were taken for microcalcification lesions (MC). A laboratory technician gently and quickly rolled the cores on the slide with fine forceps. The cores were fixed in formalin, processed and reported next day. The imprint slide was air dried and stained with DiffQuik. CI were reported using four categories: Insufficient, Benign, Indeterminate and Malignant. Counselling and planning for management were possible on the same day in women with malignant diagnoses. Clinicians were advised not to discuss negative or indeterminate CI results with women and to defer to the final CB report.
RESULTS: Cores were performed on 381 lesions. There were 83 carcinomas (38 in MC and 45 in masses) and 56 were called malignant on CI (absolute sensitivity 67.5%; 78.9% for MC and 57.8% for masses). 3 malignancies on CB were negative on CI giving a false negative rate of 3.6%. There were no false positive diagnoses. The predictive value of a benign diagnosis was 95.3%. There were no adverse effects in the histology of CB.
CONCLUSION: CI was an accurate method of providing an immediate diagnosis of malignancy in two thirds of malignancies confirmed on CB.  相似文献   
9.
10.
Adrenergic mechanisms in cerebral circulation of the goat   总被引:1,自引:0,他引:1  
  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