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   916篇
  免费   54篇
耳鼻咽喉   7篇
儿科学   26篇
妇产科学   3篇
基础医学   109篇
口腔科学   44篇
临床医学   113篇
内科学   116篇
皮肤病学   3篇
神经病学   190篇
特种医学   8篇
外科学   70篇
综合类   7篇
预防医学   79篇
眼科学   44篇
药学   89篇
肿瘤学   62篇
  2022年   5篇
  2021年   21篇
  2020年   8篇
  2019年   19篇
  2018年   16篇
  2017年   15篇
  2016年   10篇
  2015年   15篇
  2014年   16篇
  2013年   24篇
  2012年   39篇
  2011年   43篇
  2010年   22篇
  2009年   24篇
  2008年   38篇
  2007年   39篇
  2006年   49篇
  2005年   37篇
  2004年   38篇
  2003年   35篇
  2002年   39篇
  2001年   27篇
  2000年   34篇
  1999年   28篇
  1998年   15篇
  1997年   16篇
  1996年   10篇
  1995年   15篇
  1994年   4篇
  1993年   6篇
  1992年   25篇
  1991年   19篇
  1990年   25篇
  1989年   22篇
  1988年   21篇
  1987年   17篇
  1986年   16篇
  1985年   16篇
  1984年   16篇
  1983年   9篇
  1982年   7篇
  1981年   8篇
  1980年   10篇
  1979年   8篇
  1978年   5篇
  1977年   5篇
  1976年   6篇
  1974年   3篇
  1971年   3篇
  1913年   2篇
排序方式: 共有970条查询结果,搜索用时 15 毫秒
81.
The nature and extent of residential provision for people with intellectual disabilities in 1991 in England, Scotland and Wales is described. In summary, the data from the OPCS Census suggest that: (1) there existed substantial regional and national variation in the extent of residential provision for people with intellectual disabilities in England, Scotland and Wales; (2) overall, the level of provision was significantly lower than Department of Health targets for 1991 of 1.55 places per 1000 of the adult population; (3) the majority of people with intellectual disabilities were living in relatively large-scale congregate care settings; (4) the majority of residents were younger and middle-aged adults, although a significant minority were either late adolescents or very elderly; (5) young black men were significantly more likely to be placed in residential provision than their peers from other ethnic groups; (6) young Asian men, young Chinese/Other men and young Asian women were significantly less likely to be placed in residential provision than their peers from other ethnic groups; (7) rates of employment and marriage among residents were markedly lower than for the general population. The results are discussed in relation to national policy aims and existing and future demand for residential provision.  相似文献   
82.
Background Although several research studies have investigated parental experiences of the disclosure process in White families with a child with severe disabilities, little work has focused on the experiences of South Asian families. Materials and methods This study aimed to provide a rich picture of the disclosure experiences of South Asian parents of a child with severe intellectual disabilities, using semi‐structured qualitative interviews with 26 parents over two time points, and structured quantitative interviews with 136 parents. Results Parents reported variable experiences of the disclosure process, with many parents experiencing disclosure in the wrong language for them and most parents reporting little post‐disclosure support. Parents identified good practice in disclosure as prompt disclosure in the appropriate language, with the partner present (where possible), with emotional support as part of the process, with clear and practical information, and linked to post‐disclosure support from a keyworker. Conclusions Good practice in disclosure was also associated with parental understanding of their child, and parents being more likely to mobilize informal and formal supports. The implications of these findings are discussed.  相似文献   
83.
84.
85.
Giant hyperplastic polyposis of the colon   总被引:5,自引:0,他引:5  
Summary A patient with multiple large hyperplastic (metaplastic) polyps of the colon is reported. Hundreds of polyps, some over 3 cm in size, were distributed uniformly throughout the large bowel. There was no evidence of polyps in the stomach or small intestine. The polyps, except for their large size, had the histologic features of hyperplastic polyps. This condition can be clinically confused with adenomatous polyposis coli.  相似文献   
86.
The form and presentation of tuberculosis over a 10-year interval in Leeds   总被引:1,自引:0,他引:1  
Over the 10-year period 1973-82 1958 cases of tuberculosis were notified in Leeds (population 728 000). Records were traced for 1673 patients and analysed for age, race, sex, sputum status, site of tuberculosis, route of diagnosis and occupation. These results are presented. The tuberculosis screening service at the Leeds Chest Clinic diagnosed 172 cases of tuberculosis from 13 794 contacts screened and 41 cases from 12 572 newly arrived immigrants representing 10.3% and 2.4% respectively of the cases for whom records could be traced. Of these cases discovered by the tuberculosis screening service 25 were sputum positive. A further 15 cases were diagnosed from 2638 contacts screened by the static Mass Miniature Unit. The cost of the screening service at the Leeds Chest Clinic is estimated to be a minimum of 2000 pounds for every case of tuberculosis diagnosed.  相似文献   
87.
Hatton  MW; Moar  SL; Richardson  M 《Blood》1986,67(4):878-886
Pure rabbit antithrombin III was isotope labeled (with 125I or 3H) by two different methods; neither procedure caused a loss of antithrombin activity although both methods affected the affinity of the protein for Sepharose-heparin. From segments from freshly excised rabbit aorta, the uptake of isotope-labeled antithrombin III by the endothelium was rapid and saturable, although relatively small compared to the uptake of thrombin; binding of 3H-antithrombin III to the endothelium resembled that of 125I-antithrombin III. Transendothelial passage of antithrombin III into the subendothelial layers (intima-media) was slow and progressive. Endothelium binding was not affected by pretreating the vessel with either heparin, thrombin, or glycosaminoglycan-specific enzymes. Endothelium-bound antithrombin III was not selectively displaced by either heparin or thrombin. In contrast, endothelium-bound thrombin was rapidly dislodged by antithrombin III as a thrombin- antithrombin III complex. The surface of the deendothelialized aorta (ie, subjected to a balloon catheter) bound antithrombin III avidly. Pretreatment of the deendothelialized vessel with glycosaminoglycan- specific enzymes, particularly heparitinase, decreased intima-media binding by up to 80%. 125I-antithrombin III, when bound to the deendothelialized vessel surface, was actively displaced by either heparin, thrombin, or by unlabeled antithrombin III. The relatively poor binding of antithrombin III compared with that of thrombin by the endothelium in vitro supports an earlier proposal (Lollar P, Owen WG: J Clin Invest 66:1222-1230, 1980) that thrombin bound to high-affinity sites, possibly pericellular proteoglycan, of the endothelium is inactivated by plasma antithrombin III in vivo. Such a situation probably holds for large arteries at least.  相似文献   
88.
89.
90.
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