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   1695222篇
  免费   123866篇
  国内免费   3782篇
耳鼻咽喉   21730篇
儿科学   55636篇
妇产科学   46152篇
基础医学   241220篇
口腔科学   48741篇
临床医学   151310篇
内科学   333583篇
皮肤病学   38652篇
神经病学   131143篇
特种医学   63889篇
外国民族医学   242篇
外科学   257236篇
综合类   38951篇
现状与发展   4篇
一般理论   531篇
预防医学   124225篇
眼科学   40215篇
药学   123619篇
  7篇
中国医学   4477篇
肿瘤学   101307篇
  2021年   12791篇
  2019年   13527篇
  2018年   19958篇
  2017年   15214篇
  2016年   16614篇
  2015年   18961篇
  2014年   26213篇
  2013年   37945篇
  2012年   52731篇
  2011年   55421篇
  2010年   32771篇
  2009年   30691篇
  2008年   51514篇
  2007年   54797篇
  2006年   55253篇
  2005年   52538篇
  2004年   50739篇
  2003年   48149篇
  2002年   46371篇
  2001年   91783篇
  2000年   93608篇
  1999年   76961篇
  1998年   19718篇
  1997年   17268篇
  1996年   17391篇
  1995年   16742篇
  1994年   15290篇
  1993年   14072篇
  1992年   57382篇
  1991年   55270篇
  1990年   52970篇
  1989年   50748篇
  1988年   46132篇
  1987年   44937篇
  1986年   42226篇
  1985年   39987篇
  1984年   29348篇
  1983年   24909篇
  1982年   13898篇
  1979年   25529篇
  1978年   17574篇
  1977年   14906篇
  1976年   13874篇
  1975年   14564篇
  1974年   17630篇
  1973年   16944篇
  1972年   15673篇
  1971年   14453篇
  1970年   13431篇
  1969年   12517篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
The physically disabled physician   总被引:1,自引:0,他引:1  
S F Wainapel 《JAMA》1987,257(21):2935-2938
This article reviews the available literature on physically disabled physicians and discusses the attitudinal, environmental, and political barriers they may encounter. Information on 215 physicians and 92 medical students with a wide range of disabilities was analyzed. Currently available personal and technological resources are outlined and special issues pertaining to medical education are highlighted. Greater awareness and acceptance by medical peers are essential for professional success.  相似文献   
994.
Fifty-four patients with 65 superficial malignant lesions were treated by local hyperthermia combined with radiation therapy at the National Cancer Center Hospital, Tokyo. Hyperthermia was delivered with an Aloka Model HMS-020 (2450 MHz) or with a horn-type applicator of BSD-1000 (80-90 MHz). Relatively small tumours, those less than 4 cm in thickness, were treated by using 2450 MHz while 80-90 MHz delivered through the horn-type applicator was used for tumours exceeding 5 cm in thickness. The radiation dose was 4 Gy twice a week or 2 Gy five times a week, the total dose being 40-60 Gy. A total of six to 10 hyperthermia treatments ranging from 40 to 60 min each, with the tumour heated to more than 42.5 degrees C, were given twice a week within 1 h following radiation therapy. Complete response was achieved in 16 of the 30 patients (55 per cent) treated with the 2450 MHz microwave, and partial response in seven others (23 per cent). Tumours treated with the BSD-1000 achieved complete response in 10 out of 33 patients (30 per cent) and partial response in nine others (27 per cent). In five out of nine patients classified as partial responders, however, complete disappearance of tumour cells was noted by post-treatment histological examination. Complete plus partial response rates were thus essentially the same with the Aloka HMS-020 and the BSD-1000, though the rate of complete response was apparently higher with the Aloka unit, probably because it was used on smaller tumours.  相似文献   
995.
The 5q- abnormality   总被引:5,自引:0,他引:5  
S D Nimer  D W Golde 《Blood》1987,70(6):1705-1712
  相似文献   
996.
The paper is concerned with the results of a study of the circadian rhythm of cortisol secretion and sensitivity of the hypothalamohypophyseal system to small doses of dexamethasone administered in different time of a day to patients with obesity. Disturbance of the circadian rhythm of cortisol secretion resulting in change of the nature of cortisol discharge in the second half of a day, was revealed. Three groups of patients were defined with relation to the type of response of the hypothalamohypophyseal system to dexamethasone administration: with normal, paradoxical and hypersensitive reactions. The results of the study of the circadian rhythm and response of the hypothalamohypophyseal system to dexamethasone were indicative of hypothalamic disturbances in obesity. The authors emphasized the relationship between the nature of sensitivity of the hypothalamohypophyseal system to dexamethasone and age at which the disease developed.  相似文献   
997.
Effects of methylphenidate and d-amphetamine on timing in the rat   总被引:4,自引:0,他引:4  
Rats were trained to press a lever for food pellets provided according to a fixed interval 60-sec schedule of reinforcement. Probe trials (peak trials) assessed responding over two-min periods with no pellet delivered. The low rates of responding found early and late in probe trials were increased by methylphenidate and 1.0 mg/kg d-amphetamine (rate-dependent effect). Further, the mean time of responding (peak time) was shortened for both drugs (timing effect).  相似文献   
998.
999.
Plasma mianserin and desmethylmianserin concentrations were measured in 17 clinically depressed elderly patients after a single 30 mg dose of mianserin. The patients then received mianserin 30 mg daily for up to 6 weeks and the plasma concentrations were measured at weekly intervals. The relationship between concentrations of mianserin and desmethylmianserin at steady-state and at 16 and 24 hours after the single test dose was not good enough to be used for prediction of dosage requirements. Reasons for this finding are discussed.  相似文献   
1000.
The growth of Plasmodium falciparum in erythrocytes from individuals with beta zero-thalassaemia or haemoglobin (Hb) E, or both, was assessed in vitro. A significant inhibitory effect on the growth of the parasite was found only with erythrocytes from individuals doubly heterozygous for beta zeros-thalassaemia and HbE. The inhibitory effect was particularly marked with erythrocytes from splenectomized beta zeros-thalassaemia/HbE patients. The protective effect was related to HbF, Hb levels and shape abnormalities of the variant erythrocytes.  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