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   2512411篇
  免费   194478篇
  国内免费   10114篇
耳鼻咽喉   32175篇
儿科学   81132篇
妇产科学   67294篇
基础医学   355067篇
口腔科学   68720篇
临床医学   237462篇
内科学   498704篇
皮肤病学   55229篇
神经病学   209984篇
特种医学   97564篇
外国民族医学   635篇
外科学   370685篇
综合类   56847篇
现状与发展   3篇
一般理论   934篇
预防医学   209349篇
眼科学   54561篇
药学   180088篇
  54篇
中国医学   5145篇
肿瘤学   135371篇
  2021年   20716篇
  2019年   20946篇
  2018年   29154篇
  2017年   22498篇
  2016年   25727篇
  2015年   29057篇
  2014年   40405篇
  2013年   61155篇
  2012年   79920篇
  2011年   85455篇
  2010年   51356篇
  2009年   48878篇
  2008年   78619篇
  2007年   83369篇
  2006年   84485篇
  2005年   81949篇
  2004年   77824篇
  2003年   74672篇
  2002年   71580篇
  2001年   110895篇
  2000年   113757篇
  1999年   95934篇
  1998年   29590篇
  1997年   26475篇
  1996年   26904篇
  1995年   26385篇
  1994年   24693篇
  1993年   23132篇
  1992年   78116篇
  1991年   76181篇
  1990年   73478篇
  1989年   69793篇
  1988年   64853篇
  1987年   63557篇
  1986年   60385篇
  1985年   58068篇
  1984年   44425篇
  1983年   37467篇
  1982年   23518篇
  1981年   21049篇
  1979年   40076篇
  1978年   29150篇
  1977年   24203篇
  1976年   23048篇
  1975年   23741篇
  1974年   28437篇
  1973年   27461篇
  1972年   25379篇
  1971年   23438篇
  1970年   21577篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Mycobacterium ulcerans infection in Ashanti region, Ghana   总被引:1,自引:0,他引:1  
We describe a series of 96 cases of Mycobacterium ulcerans infection (Buruli ulcer) from a new endemic focus in the Afram valley, north of Agogo, in Ghana. 63 cases were children under 13 years old. Active treatment by excision and skin grafting necessitates long stays in hospital and repeated procedures. Scarring and contracture are frequent. Eyes and other vital organs may be destroyed. In its endemic foci Buruli ulcer is a serious health burden on rural populations. Research is urgently needed, especially in prevention and non-surgical management.  相似文献   
992.
993.
Diabetic polyneuropathy   总被引:1,自引:0,他引:1  
  相似文献   
994.
The role of timing of transplant nephrectomy after renal transplantation has not been well defined. This report compares the morbidity, mortality, and hospitalization costs of 37 patients undergoing transplant nephrectomy within 14 days after graft failure and return to dialysis, with 31 patients undergoing delayed transplant nephrectomy (less than 14 days after graft failure and return to dialysis). This analysis revealed that there were no significant (P greater than .05) differences in patient morbidity and mortality between these groups. There was, however, a substantial increase (P less than .05) in the cost of hospitalization in the delayed nephrectomy group. For this reason, we recommend early nephrectomy after renal transplant failure in order to minimize the cost of health care for these patients undergoing failed cadaver donor transplant nephrectomy.  相似文献   
995.
We report a case of pulmonary oedema follwing airway obstructionin a patient who underwent biopsy of a tumo ur in volving theanterior mediastinum and neck. The occurrence of airway obstructionin patients with anterior mediastinal masses, and the pathogenesisof pulmonary oedema occurring in association with airway obstruction,are discussed.  相似文献   
996.
Following the outbreak of poliomyelitis in Gazankulu in 1982, the immunisation services in Gazankulu were thoroughly examined. As a result of this, a comprehensive immunisation policy for Gazankulu was accepted in November 1986. The broad aim of the policy is to provide effective immunisation to all Gazankulu residents against tuberculosis, diphtheria, pertussis, tetanus, poliomyelitis and measles. A specific objective is that by the end of 1987, 85% of under-5s should have been vaccinated against these six diseases and by the end of 1990 this percentage should be 97%. The detailed strategies to reach these objectives are highlighted. Within the framework of the objectives, the policy allows different areas to formulate individual strategies. Programme monitoring and community involvement are two crucial aspects of the policy and these are discussed in detail. The early successes and difficulities in implementing this policy are discussed.  相似文献   
997.
A 4.5-year follow-up retrospective study on the use of epiphysiodesis procedure for juvenile hallux valgus deformity and metatarsus primus adductus deformity shows a good reduction of deformity in nine patients with minimal change in one patient that can be explained due to the timing of the procedure. This is a minor operation for juvenile bunion deformities, using epiphyseal arrest techniques. The only complication to this procedure was one case with a noted metatarsus primus elevatus due to incomplete epiphyseal arrest from dorsal to plantar. This procedure has been found to be a safe and effective way of dealing with juvenile hallux valgus deformity when metatarsus primus adductus is the deforming force. It should be stated that in all cases a follow-up biomechanical examination and casting for orthotics took place and to date no complications, other than what has been previously mentioned, has occurred. I shall continue to perform this procedure where indicated and shall report my findings as they become available.  相似文献   
998.
The second documented case of renal aspergilloma due to Aspergillusflavus is presented. The merits of the medical therapy thatfailed are discussed. Pathological examination showed a nidusof aspergillus around suture material persisting from a pyelolithotomyoperation 2 years before in India. We argue that this was thereason for the failure of the medical therapy. This is the firstcase of its kind reported.  相似文献   
999.
1000.
A study of intravenous (i.v.) cannula usage for medical emergencies admitted to hospitals in the Newham Health District was undertaken during two defined periods (24 and 35 days). Almost half the cannulas inserted (47%) were not flushed following an initial bolus injection of heparinized saline. The duration that cannulas remained in a vein ranged from 24 hours to 8 days (median 2 days) and inflammation around the cannula site was related to the length of time since insertion but unrelated to whether the cannula was flushed regularly or to the type of fluid used. Our findings indicate a substantial wastage of i.v. cannulas due to difficulties with insertion and suggest that isotonic saline, without heparin, is effective in maintaining cannula patency for 48 hours. It is concluded that these findings are not unique to the Newham Health District and worthwhile financial savings should be achieved throughout the NHS if clinicians reconsider the indications and use of i.v. cannulas for their patients.  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