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   3212092篇
  免费   229816篇
  国内免费   8636篇
耳鼻咽喉   43283篇
儿科学   107211篇
妇产科学   88604篇
基础医学   453768篇
口腔科学   89271篇
临床医学   293594篇
内科学   628425篇
皮肤病学   75602篇
神经病学   262429篇
特种医学   123315篇
外国民族医学   1009篇
外科学   478106篇
综合类   67448篇
现状与发展   5篇
一般理论   1268篇
预防医学   248498篇
眼科学   72324篇
药学   234250篇
  67篇
中国医学   6570篇
肿瘤学   175497篇
  2019年   25009篇
  2018年   35417篇
  2017年   27229篇
  2016年   31348篇
  2015年   35325篇
  2014年   48612篇
  2013年   73714篇
  2012年   97630篇
  2011年   103393篇
  2010年   62188篇
  2009年   59358篇
  2008年   96685篇
  2007年   102525篇
  2006年   104499篇
  2005年   100123篇
  2004年   96861篇
  2003年   93528篇
  2002年   90154篇
  2001年   152896篇
  2000年   156687篇
  1999年   132168篇
  1998年   38002篇
  1997年   33892篇
  1996年   33962篇
  1995年   32900篇
  1994年   30323篇
  1993年   28263篇
  1992年   103561篇
  1991年   100047篇
  1990年   97253篇
  1989年   93917篇
  1988年   85853篇
  1987年   84668篇
  1986年   79272篇
  1985年   75928篇
  1984年   56630篇
  1983年   47988篇
  1982年   28556篇
  1981年   25568篇
  1979年   50452篇
  1978年   35868篇
  1977年   30398篇
  1976年   28342篇
  1975年   30070篇
  1974年   35810篇
  1973年   34121篇
  1972年   31762篇
  1971年   29572篇
  1970年   27250篇
  1969年   25992篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
A 43-year-old alcoholic presented in coma with ketoacidosis, after three days of nausea and feeling generally unwell, which had been preceded by a prolonged three-week period of heavy alcohol consumption with poor dietary intake. The acidosis responded rapidly to intravenous dextrose. This is the first Scottish report of a case of alcoholic ketoacidosis.  相似文献   
993.
Summary The authors report 165 cases of thoraco-lumbar lesions with neurological dysfunction. All the patient were operated. They analyze the neurological and mechanical results and indicate the use of different osteosynthesis apparatus according to the type and level of lesions.Harrington's rods seem to give more precise repositioning while Roy Camille's plates give more stability. When the posterior wall of the spinal canal is intact, Kempf's compression rods can be used.Thoraxic spine injuries seem to be an indication for Harrington's rods, while lumbar injuries seem to call for Camille's plates.  相似文献   
994.
Intrathecal morphine for post-thoracotomy pain   总被引:1,自引:0,他引:1  
We wished to investigate possible differences in the duration of postoperative analgesia and the incidence of respiratory depression after the intrathecal injection in the lumbar area of 10 micrograms/kg morphine in hypobaric and hyperbaric solution for relief of post-thoracotomy pain. Twenty-nine patients received morphine plus dextrose (hyperbaric) and 21 received morphine in preservative-free normal saline. The duration of analgesia was longer with the morphine in the normal saline group than in the hyperbaric group (P less than 0.04). One patient developed delayed respiratory depression. Our data support the use of morphine in normal saline mixtures for greater duration of analgesia after thoracic operations.  相似文献   
995.
996.
Amplification of the graft-versus-host reaction by partial body irradiation   总被引:1,自引:0,他引:1  
An experimental model has been developed for the study of combined effects of partial body irradiation (PBI) and graft-versus-host disease (GVHD) in which irradiation is delivered to the thorax 24 hr prior to induction of GVHD in hybrid mice by the injection of parental lymphoid cells. In mice irradiated to 1000 cGy or exposed to low doses of allogeneic lymphoid cells (20 X 10(6)), survival was 100% at 250 days. In contrast, combination of the two treatments, GVHD and PBI, resulted in a mortality of 83% and a mean survival time of 29 days, indicating synergy between GVHD and PBI. From histological studies of the lung it appeared that about 40% of the deaths occurring after combined GVHD/PBR treatment might be attributable to pneumonia. The cause of death in the remaining mice receiving combined treatment is not known. Mice receiving combined PBI/lymphoid cell treatment develop a characteristic skin lesion that is not seen in nonirradiated mice and is confined to the irradiated area. The effect of preinduction PBR on the timing and severity of GVHD is similar to that which would be produced by an increase in the number of effector cells.  相似文献   
997.
B Lalor  A Freemont  S Carlile 《BONE》1986,7(4):273-276
Transilial crest bone biopsy with quantitative histomorphometry is an important technique for the assessment of metabolic and endocrine bone disease. The surface area of the histologic section suitable for histomorphometric analysis is reduced by the build-up of bone dust and by trabecular fracture, produced by the conventional Bordier bone drill. We describe here a modification of this drill that both allows escape of dust from around the cutting edge of the teeth and greatly reduces bone dust volume and trabecular fracture. In paired samples the new drill was shown to improve significantly the quality of the biopsy specimens.  相似文献   
998.
999.
1000.
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