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   1995篇
  免费   159篇
  国内免费   13篇
耳鼻咽喉   9篇
儿科学   99篇
妇产科学   28篇
基础医学   225篇
口腔科学   37篇
临床医学   196篇
内科学   465篇
皮肤病学   28篇
神经病学   86篇
特种医学   334篇
外科学   298篇
综合类   15篇
一般理论   1篇
预防医学   94篇
眼科学   8篇
药学   65篇
中国医学   1篇
肿瘤学   178篇
  2021年   20篇
  2020年   10篇
  2019年   29篇
  2018年   38篇
  2017年   21篇
  2016年   24篇
  2015年   39篇
  2014年   40篇
  2013年   75篇
  2012年   69篇
  2011年   60篇
  2010年   61篇
  2009年   61篇
  2008年   53篇
  2007年   76篇
  2006年   67篇
  2005年   52篇
  2004年   55篇
  2003年   41篇
  2002年   43篇
  2001年   34篇
  2000年   45篇
  1999年   39篇
  1998年   103篇
  1997年   76篇
  1996年   84篇
  1995年   57篇
  1994年   57篇
  1993年   65篇
  1992年   41篇
  1991年   36篇
  1990年   44篇
  1989年   61篇
  1988年   46篇
  1987年   58篇
  1986年   42篇
  1985年   43篇
  1984年   35篇
  1983年   25篇
  1982年   25篇
  1981年   25篇
  1980年   32篇
  1979年   16篇
  1978年   22篇
  1977年   22篇
  1976年   23篇
  1975年   18篇
  1973年   7篇
  1970年   8篇
  1966年   6篇
排序方式: 共有2167条查询结果,搜索用时 15 毫秒
1.
Needle-localized breast biopsy: why do we fail?   总被引:10,自引:0,他引:10  
Jackman  RJ; Marzoni  FA  Jr 《Radiology》1997,204(3):677
  相似文献   
2.
Lymphedema is an under-recognized, progressive, life-long condition estimated to impact 2-3 million people in the United States. The incidence of breast cancer related lymphedema varies greatly in the literature largely due to different measurement techniques, competing thresholds for defining lymphedema, and variation in length of follow-up. Multiple imaging techniques have become useful for diagnosis. Lymphoscintigraphy is one of the most commonly used, as it can identify pathways of lymphatic drainage, quantify extent of dermal backflow, and help determine functional and morphologic changes in the lymphatic system. Early detection and intervention hold the greatest promise of reducing the incidence of lymphedema. Health care providers involved with cancer patients need to become more educated about lymphedema, aware of current risk-reduction practices, and familiar with methods of diagnosis and assessment, so that patients with early swelling can be referred to lymphedema treatment specialists at a time when treatment is more effective.  相似文献   
3.
4.
5.
荧光原位杂交技术分析人结肠菌群方法研究   总被引:2,自引:0,他引:2  
建立荧光原位杂交技术分析人体内结肠菌群的方法。取受试者新鲜粪便 ,选用 5种特异性的 16SrRNA寡核苷酸探针 ,检测粪便样本收集后的保存时间、温度 ,离心条件及样本固定液存放时间对杂交计数结果的影响。结果建立最佳实验条件为 :粪便样本收集后应尽快在 4℃下保存 ,放置时间不要超过 12小时即作处理 ;样本的适宜离心条件为 70 0g 2分钟 ;样本用多聚甲醛固定后在 - 80℃下存放时间不要超过 5个月。该方法具有较好的稳定性 ,可以有效地检出个体之间结肠菌群的差异。  相似文献   
6.
A 49 year old white woman with systemic lupus erythematosus and bronchiolitis obliterans was treated with prednisone (1 mg/kg daily), which led to a transitory improvement in pulmonary status. Cyclophosphamide was then added--4 mg/kg daily intravenously for five days, then 2 mg/kg daily orally--and this was followed by a dramatic and prolonged improvement.  相似文献   
7.
F Maltais  G Carrier  Y Cormier    F Sris 《Thorax》1991,46(6):419-423
Cephalometry is often used to assess patients with sleep apnoea but whether these measurements differ from those in non-apnoeic snorers and how they are influenced by age is not clear. Cephalometric radiographs of patients with sleep apnoea were compared with those of snorers without sleep apnoea and those of non-snorers. Fifty two snorers with suspected sleep apnoea had a conventional sleep study and were divided into two groups: those with an apnoea-hypopnoea index greater than 10/h (n = 40, sleep apnoea group) and those whose apnoea-hypopnoea index was 10/h or less (n = 12, snorer group). The cephalometric measurements in these patients were compared with those of 34 non-snoring control subjects. Controls were subdivided into two groups: control group 1 included 17 subjects similar in age to the sleep apnoea and snorer groups (mean (SD) age 50.0 (10.9), 50.7 (9.4), and 50.6 (9.7) years); control group 2 included 15 young men (25.4 (2.6) years). The distance from the mandibular plane to the hyoid bone (MP-H) and the length of the soft palate were greater in the patients with sleep apnoea (28.7 (7.8) and 43.6 (5.0) mm) than in the snorers (23.7 (4.2) and 40.3 (4.9 mm). The MP-H was similar in snorers and age matched control subjects, but was significantly greater in the older than in the younger control subjects (22.1 (6.1) vs 17.0 (6.8]. The soft palate was longer in subjects who snored (both sleep apnoea patients and snorers) than in control subjects. The MP-H distance significantly correlated with age for all subjects (snorers and controls) and for the control subjects alone. This study shows that non-apnoeic snorers have cephalometric abnormalities that differ from those of patients with sleep apnoea and that cephalometric values are influenced by the subject's age.  相似文献   
8.
Interview questionnaires offer more validity than self-administered format in exploring psychopathological or psychosocial phenomena of interest in psychiatric research. If used, special care needs to be paid to interviewers' training and ensuring that they maintain their reliability. No widespread training standards exist and each schedule may carry its own procedure. Our aims are to indicate how we trained interviewers with the French version of the Present State Examination (Wing, Cooper and Sartorius, 1974) and how we checked and kept acceptable interraters reliability during one study. We will provide data on the interraters reliability during the training and the study, as well as the test-retest reliability. These results will be used to support some guidelines when using this sort of psychiatric research questionnaires in order to ensure comparability both within the study and between studies.  相似文献   
9.
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