全文获取类型
收费全文 | 2074599篇 |
免费 | 156031篇 |
国内免费 | 4143篇 |
专业分类
耳鼻咽喉 | 29177篇 |
儿科学 | 71915篇 |
妇产科学 | 58286篇 |
基础医学 | 297417篇 |
口腔科学 | 57186篇 |
临床医学 | 185358篇 |
内科学 | 406436篇 |
皮肤病学 | 46328篇 |
神经病学 | 163539篇 |
特种医学 | 81412篇 |
外国民族医学 | 941篇 |
外科学 | 314575篇 |
综合类 | 47003篇 |
现状与发展 | 1篇 |
一般理论 | 749篇 |
预防医学 | 160183篇 |
眼科学 | 46954篇 |
药学 | 151954篇 |
5篇 | |
中国医学 | 4004篇 |
肿瘤学 | 111350篇 |
出版年
2018年 | 21469篇 |
2017年 | 16444篇 |
2016年 | 18363篇 |
2015年 | 20791篇 |
2014年 | 28813篇 |
2013年 | 44113篇 |
2012年 | 59328篇 |
2011年 | 63117篇 |
2010年 | 37841篇 |
2009年 | 35810篇 |
2008年 | 60027篇 |
2007年 | 63961篇 |
2006年 | 64530篇 |
2005年 | 62495篇 |
2004年 | 61064篇 |
2003年 | 58903篇 |
2002年 | 57490篇 |
2001年 | 98534篇 |
2000年 | 101600篇 |
1999年 | 86054篇 |
1998年 | 24006篇 |
1997年 | 21607篇 |
1996年 | 21911篇 |
1995年 | 20968篇 |
1994年 | 19696篇 |
1993年 | 18275篇 |
1992年 | 68580篇 |
1991年 | 67199篇 |
1990年 | 65560篇 |
1989年 | 62878篇 |
1988年 | 57662篇 |
1987年 | 57254篇 |
1986年 | 53472篇 |
1985年 | 51519篇 |
1984年 | 38652篇 |
1983年 | 32606篇 |
1982年 | 19237篇 |
1981年 | 17415篇 |
1979年 | 35039篇 |
1978年 | 24865篇 |
1977年 | 21052篇 |
1976年 | 19753篇 |
1975年 | 21135篇 |
1974年 | 25040篇 |
1973年 | 24151篇 |
1972年 | 22234篇 |
1971年 | 20494篇 |
1970年 | 19151篇 |
1969年 | 17564篇 |
1968年 | 16191篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
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
942.
943.
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
944.
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
945.
946.
947.
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
948.
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
949.
950.
B Haver 《Acta psychiatrica Scandinavica》1987,76(1):21-27
In a long-term follow-up study of 44 female alcoholics, a family history of alcoholism was related to younger age of onset of problem drinking, but did not necessarily imply a poorer outcome within this highly selected group of individuals. Alcoholism in father and his family was not related to either antisocial or borderline personality disorder nor outcome. However, alcoholism in mother and her family correlated with both borderline personality disorder and a significantly poorer outcome. The findings are discussed within different frames of reference, considering genetic mechanisms, psychodynamic factors and family systems theory. 相似文献