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   1039951篇
  免费   73910篇
  国内免费   1540篇
耳鼻咽喉   14003篇
儿科学   27451篇
妇产科学   25569篇
基础医学   149611篇
口腔科学   31246篇
临床医学   89733篇
内科学   204584篇
皮肤病学   21110篇
神经病学   82820篇
特种医学   41149篇
外国民族医学   88篇
外科学   165554篇
综合类   18515篇
现状与发展   2篇
一般理论   334篇
预防医学   74375篇
眼科学   22910篇
药学   78999篇
  3篇
中国医学   2359篇
肿瘤学   64986篇
  2019年   7741篇
  2018年   11178篇
  2017年   8899篇
  2016年   9822篇
  2015年   11181篇
  2014年   15181篇
  2013年   21635篇
  2012年   30492篇
  2011年   31432篇
  2010年   18175篇
  2009年   17767篇
  2008年   30292篇
  2007年   31578篇
  2006年   32148篇
  2005年   30742篇
  2004年   29081篇
  2003年   27878篇
  2002年   27112篇
  2001年   58219篇
  2000年   60018篇
  1999年   50077篇
  1998年   12087篇
  1997年   10574篇
  1996年   10779篇
  1995年   9887篇
  1994年   9166篇
  1993年   8418篇
  1992年   37766篇
  1991年   35963篇
  1990年   34646篇
  1989年   33655篇
  1988年   30650篇
  1987年   29683篇
  1986年   27675篇
  1985年   26470篇
  1984年   18794篇
  1983年   15994篇
  1982年   8248篇
  1979年   16549篇
  1978年   11074篇
  1977年   9451篇
  1976年   8171篇
  1975年   8946篇
  1974年   10856篇
  1973年   10236篇
  1972年   9699篇
  1971年   9184篇
  1970年   8688篇
  1969年   8174篇
  1968年   7478篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
This article describes the outcomes of a study involving family members of communication-impaired long-term care residents in a collaborative nursing/speech language pathology intervention designed to increase the residents' communication ability. Family members provided memorabilia and artifacts or produced audio or video tapes, for use in conjunction with a speech therapy enhancement program (STEP). Findings revealed that, despite a minimal improvement in speech ability, there was a dramatic increase in family members' satisfaction.  相似文献   
142.
Carotid sonography is being performed on more than 5,000 participants in the Cardiovascular Health Study, a prospective, multicenter study of cardiovascular disease in men and women aged 65 years and older. The sonographic methods used to examine and measure the extracranial carotid arteries are described. Initial validation studies were performed on 61 subjects with a mean age of 68.6 years. Analysis of within- and between-sonographer differences and between-reader differences were performed for selected variables. In general, the mean absolute differences for within- and between-sonographer comparisons were small, with even less variability between readers. Variability was less for the common carotid artery than for the internal carotid artery. These data suggest that carotid sonography is a reliable and reproducible method for use in the study of carotid atherosclerosis in population studies.  相似文献   
143.
A 43-year-old woman suffered a blast-type injury to the head and neck. She subsequently developed bilateral internal carotid artery occlusion and bilateral anterior cerebral artery infarction not demonstrated by magnetic resonance imaging scan 24 hours after the explosion, but confirmed by a second scan 8 days after the explosion. In patients with blast-type injury to the head and neck who develop coma with a nonfocal neurological exam, the possibility of bilateral carotid artery occlusion and bilateral ischemic infarction should be considered.  相似文献   
144.
Flavonoids as medicines   总被引:1,自引:0,他引:1  
Although flavonoids have been used for a long time, many medical practitioners and pharmacists know very little about them. This article gives a few particulars of some flavonoids and plant extracts: rutin, water soluble derivatives of rutin, citroflavonoids, anthrocyanins, procyanidins, silymarin, Ginkgo biloba, Chrysanthellum indicum and Lespedeza capitata.  相似文献   
145.
146.
There is increasing evidence from human and experimental studies that the most important factor governing the outcome in head injury is the severity of diffuse axonal injuries. The authors have experienced 18 cases of severe diffuse axonal injury which showed post-traumatic coma for more than 24 hours and CT findings resembling those of shearing injuries of the cerebral white matter such as have been presented by Zimmerman et al. (1978). The consciousness levels on admission were 6 or less on the Glasgow Coma Scale and all cases were shown clinically to have primary brain stem injury. The main type of head trauma resulted from road traffic accidents (83%). Skull fractures were found in only 5 cases (28%). These findings suggested that acceleration/deceleration injury produce in the patients severe diffuse axonal injury. Initial ICP was below 20 mmHg in 11 cases out of 13 (85%). Parenchymal small hemorrhagic lesions of initial CT were basal ganglia (7 cases), corpus callosum (4 cases), pons (4 cases), midbrain (3 cases) and thalamus (2 cases). Extraparenchymal hemorrhagic lesions included intraventricular hemorrhage (6 cases) and subarachnoid hemorrhage (6 cases). Two autopsied cases of severe diffuse axonal injury (acute case and chronic case) showed remarkable congestion and edema in the deep part of the frontal white matter. Microscopic examination revealed marked axonal degeneration including axonal retraction ball in the corpus callosum, in the internal capsule and in the white matter of the brain stem. Glasgow Outcome Scale of the 18 patients at 3 months after the trauma made us concerned that no patients indicated good recovery or even only moderate disability.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
147.
H Sasaki  K Sudoh  K Hamada  T Hamada  K Tashiro 《Neurology》1987,37(7):1258-1262
We studied two patients with nonfamilial olivopontocerebellar atrophy with skeletal myoclonus. Palatal or skeletal myoclonus is probably not a coincidental finding but another manifestation of the underlying disease. In both cases, the myoclonus was suppressed by administration of trihexyphenidyl, indicating a cholinergic disorder.  相似文献   
148.
149.
150.
Topical analgesia for relief of post-circumcision pain   总被引:1,自引:0,他引:1  
  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