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   2350691篇
  免费   171259篇
  国内免费   3321篇
耳鼻咽喉   32053篇
儿科学   75944篇
妇产科学   62697篇
基础医学   348215篇
口腔科学   63630篇
临床医学   211387篇
内科学   457367篇
皮肤病学   51734篇
神经病学   185290篇
特种医学   88047篇
外国民族医学   489篇
外科学   353940篇
综合类   47523篇
现状与发展   12篇
一般理论   848篇
预防医学   182753篇
眼科学   54336篇
药学   175158篇
  11篇
中国医学   4578篇
肿瘤学   129259篇
  2021年   19004篇
  2019年   19548篇
  2018年   27073篇
  2017年   20376篇
  2016年   22764篇
  2015年   25654篇
  2014年   36144篇
  2013年   54001篇
  2012年   74727篇
  2011年   79441篇
  2010年   47086篇
  2009年   44592篇
  2008年   74646篇
  2007年   79520篇
  2006年   80321篇
  2005年   77800篇
  2004年   74387篇
  2003年   71704篇
  2002年   69368篇
  2001年   108746篇
  2000年   111458篇
  1999年   93498篇
  1998年   26990篇
  1997年   23661篇
  1996年   24058篇
  1995年   22715篇
  1994年   20894篇
  1993年   19713篇
  1992年   72000篇
  1991年   70070篇
  1990年   68391篇
  1989年   65666篇
  1988年   60302篇
  1987年   59126篇
  1986年   55218篇
  1985年   53005篇
  1984年   39313篇
  1983年   33399篇
  1982年   19859篇
  1979年   35868篇
  1978年   25652篇
  1977年   21231篇
  1976年   20334篇
  1975年   21818篇
  1974年   26149篇
  1973年   24803篇
  1972年   23201篇
  1971年   22037篇
  1970年   20247篇
  1969年   19315篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Two infants, one 4 months old and the other 2 months old, having histologically confirmed indeterminate leprosy are reported. The route of infection, mode of transmission, and incubation period are discussed with reference to these two cases of infantile leprosy.  相似文献   
993.
FURST  A L; SHAMBA  E 《Family practice》1989,6(3):177-181
An audit of ‘deficient outcome’ involves the step-by-stepanalysis of every event preceding the occurrence of a preventablemedical outcome in order to determine exactly what went wrong.This paper describes methodological problems and related issuesassociated with a deficient outcome audit undertaken on fivestillbirths which occurred in a rural family medical practiceIsrael between 1985 and 1987. Problems included initial officialdisinterest towards the audit, and the high levels of suspicionand antagonism which it aroused in hospital staff approachedfor information. The problematic aspect of such audits needsmore attention. The importance of this type of audit for establishing the precisereasons for perinatal deaths, and thus for maintaining antenatalcare standards is discussed. In view of the small numbers ofsuch events likely to occur within any one family practice itis not only feasible but also desirable for more family doctorsto carry out such audits routinely, despite the difficultieswhich are involved.  相似文献   
994.
995.
The myopathies that can manifest themselves within the lower extremity are reported here and can serve as a guideline for clinicians in the early diagnosis of these disabling conditions. The classification of these disease entities based on signs and symptoms is significant if correlated with the age of the patient at the time of onset, the evolution and course, and the type of familial inheritance. This article can also aid the practitioner in assessing and planning the course of treatment for a particular patient.  相似文献   
996.
997.
998.
A total of 42 patients with recurrent superficial bladder tumors or carcinoma in situ entered a prospective, randomized trial to compare the efficacy of bacillus Calmette-Guerin therapy with and without quarterly maintenance instillations of bacillus Calmette-Guerin. Maintenance therapy did not reduce further bladder tumor recurrence rates or the interval to recurrence in patients who responded to the initial course of therapy. However, prolongation of toxicity was observed with maintenance bacillus Calmette-Guerin therapy.  相似文献   
999.
Kojic amine [2-(aminomethyl)-5-hydroxy-4H-pyran-4-one], an analogue of gamma-aminobutyric acid (GABA), produced dose-related, but short-lived, antinociceptive activity in the 48 degrees C [ED50 = 9.2 (8.2-10.3) mg/kg i.p.] and 55 degrees C [ED50 = 13.8 (12.2-15.7) mg/kg i.p.] hot-plate tests in the mouse. The antinociceptive activity of kojic amine at 48 degrees C was found to be insensitive to bicuculline (1.0 mg/kg i.p.) and picrotoxin (0.5 mg/kg i.p.). At this temperature, antinociception was distinctly separate from the impairment of motor function (measured by a rotorod assay) and was not significantly affected by prior treatment with the cholinergic antagonist, atropine sulfate (10.0 mg/kg i.p.). However, at 55 degrees C, the antinociceptive effect of a large dose (20 mg/kg i.p.) of kojic amine was significantly attenuated by similar pretreatment with atropine sulfate, but not by the peripheral cholinergic antagonist, atropine methylnitrate (10.0 mg/kg i.p.). Kojic amine exhibited no significant interaction with haloperidol (0.5 mg/kg i.p.) at this temperature. In animals made tolerant to morphine, THIP or baclofen, there was analgesic cross-tolerance between kojic amine, morphine and baclofen but not between kojic amine and THIP. It is suggested that kojic amine-induced antinociception is similar to that produced by both THIP and baclofen. Thus, kojic amine represents a unique tool with which to study GABA-ergic antinociceptive processes.  相似文献   
1000.
Computed tomography of the brain in the Smith-Lemli-Opitz syndrome   总被引:1,自引:0,他引:1  
Computed tomographic (CT) scans of the brain in a child with Smith-Lemli-Opitz syndrome revealed enlargement of the ventricular system, hypoplasia of the cerebellum, and abnormal thickening of the gray matter, consistent with pachygyria. These findings have been previously noted in autopsies performed on patients with this disorder. We conclude that CT scanning is a valuable tool in the evaluation of children suspected of having the Smith-Lemli-Opitz syndrome.  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