全文获取类型
收费全文 | 2394586篇 |
免费 | 186839篇 |
国内免费 | 9808篇 |
专业分类
耳鼻咽喉 | 30655篇 |
儿科学 | 78234篇 |
妇产科学 | 65486篇 |
基础医学 | 339689篇 |
口腔科学 | 65934篇 |
临床医学 | 225493篇 |
内科学 | 474717篇 |
皮肤病学 | 52987篇 |
神经病学 | 198682篇 |
特种医学 | 92426篇 |
外国民族医学 | 622篇 |
外科学 | 352602篇 |
综合类 | 55319篇 |
现状与发展 | 3篇 |
一般理论 | 838篇 |
预防医学 | 200702篇 |
眼科学 | 51877篇 |
药学 | 172264篇 |
11篇 | |
中国医学 | 4917篇 |
肿瘤学 | 127775篇 |
出版年
2018年 | 26500篇 |
2017年 | 20421篇 |
2016年 | 23331篇 |
2015年 | 26399篇 |
2014年 | 36643篇 |
2013年 | 56095篇 |
2012年 | 72328篇 |
2011年 | 77387篇 |
2010年 | 46619篇 |
2009年 | 44321篇 |
2008年 | 71340篇 |
2007年 | 75654篇 |
2006年 | 76933篇 |
2005年 | 74363篇 |
2004年 | 70878篇 |
2003年 | 68208篇 |
2002年 | 65425篇 |
2001年 | 109637篇 |
2000年 | 112740篇 |
1999年 | 94624篇 |
1998年 | 28219篇 |
1997年 | 25364篇 |
1996年 | 25961篇 |
1995年 | 25556篇 |
1994年 | 23937篇 |
1993年 | 22434篇 |
1992年 | 77390篇 |
1991年 | 75556篇 |
1990年 | 72902篇 |
1989年 | 69283篇 |
1988年 | 64394篇 |
1987年 | 63111篇 |
1986年 | 59953篇 |
1985年 | 57625篇 |
1984年 | 43907篇 |
1983年 | 37033篇 |
1982年 | 22919篇 |
1981年 | 20468篇 |
1980年 | 19160篇 |
1979年 | 39718篇 |
1978年 | 28770篇 |
1977年 | 23904篇 |
1976年 | 22742篇 |
1975年 | 23484篇 |
1974年 | 28130篇 |
1973年 | 27186篇 |
1972年 | 25121篇 |
1971年 | 23286篇 |
1970年 | 21397篇 |
1969年 | 19812篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
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
992.
N G Crisp C B Ijsselmuiden R De Swardt M M Steyn D M Gibbs E T Tshabalala 《Suid-Afrikaanse tydskrif vir geneeskunde》1987,72(5):345-348
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
993.
L E Sheridan 《Clinics in Podiatric Medicine and Surgery》1987,4(1):63-74
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
994.
Davies S. P.; Webb W. J. S.; Patou G.; Murray W. K.; Denning D. W. 《Nephrology, dialysis, transplantation》1987,2(6):568-572
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
995.
996.
997.
998.
Results of prevention programs with adolescents 总被引:3,自引:0,他引:3
C L Perry 《Drug and alcohol dependence》1987,20(1):13-19
Programs for preventing smoking and alcohol and drug abuse have radically changed in the past decade. Instead of being regarded as a health or discipline problem that involves only a few deviant adolescents, drug use has begun to be viewed as social behavior that is functional for adolescents, not capricious, and is normative for that population. The most successful prevention programs have sought to delay the onset of tobacco use. Based on theoretical and etiological research, these programs target factors that have repeatedly been predictive of adolescent smoking, alcohol and drug use. The programs teach adolescents (1) why people their age smoke tobacco or use alcohol and drugs; (2) how these meanings get established by peers, older role models and advertising; (3) how to resist these influences to smoke or to use alcohol and drugs; and (4) life skills and competencies to counterbalance the functions that drug use serves. Because of the association with the onset of smoking and the onset of using other drugs, these strategies are being studied for alcohol use and other drugs. In addition, elected peer leaders are trained to conduct these activities with their classmates and act as new role models for non-use. Evaluations of these approaches are optimistic. Studies in northern California and Minnesota reveal 50-70% reductions in the onset of smoking. Botvin's 'Life Skills Training' program demonstrates success in delaying heavy alcohol and marijuana use. 相似文献
999.
Summary: Fifty-seven isolates of Basidiobolus from reptiles and amphibians, and 7 other obtained from the American Type Culture Collection (ATCC) in Maryland were studied for their extracellular enzyme activities on solid media. The Conidiobolus isolates studied included 4 recovered from Nigerian soil and additional 4 obtained from the ATCC All these isolates produced active extracellular lipase and protease and failed to exhibit amylase, deoxyribonuclease and ribonuclease activities. The significance of the findings is discussed.
Zusammenfassung: Fünfundsiebzig Basidiobolus-Isolate aus Reptilien und Amphibien und sieben weitere aus der American Type Culture Collection (ATCC) in Maryland wurden auf Aktivtäten extrazellulärer Enzyme auf festen Medien untersucht Die untersuchten Conidiobolus-Isolate schlossen vier aus nigerianischen Böden und vier weitere aus der ATCC ein. Alle Isolate zeigten extrazellulär Lipase- und Proteaseaktivität Amylase-, Desoxyribonuclease- und Ribonucleaseaktivität war jedoch nicht nachzuweisen. Die Bedeutung dieser Befunde wird diskutiert. 相似文献
Zusammenfassung: Fünfundsiebzig Basidiobolus-Isolate aus Reptilien und Amphibien und sieben weitere aus der American Type Culture Collection (ATCC) in Maryland wurden auf Aktivtäten extrazellulärer Enzyme auf festen Medien untersucht Die untersuchten Conidiobolus-Isolate schlossen vier aus nigerianischen Böden und vier weitere aus der ATCC ein. Alle Isolate zeigten extrazellulär Lipase- und Proteaseaktivität Amylase-, Desoxyribonuclease- und Ribonucleaseaktivität war jedoch nicht nachzuweisen. Die Bedeutung dieser Befunde wird diskutiert. 相似文献
1000.