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   2489036篇
  免费   176624篇
  国内免费   3639篇
耳鼻咽喉   34678篇
儿科学   81301篇
妇产科学   66368篇
基础医学   367170篇
口腔科学   68023篇
临床医学   221851篇
内科学   481796篇
皮肤病学   55668篇
神经病学   197997篇
特种医学   95186篇
外国民族医学   513篇
外科学   376486篇
综合类   48495篇
现状与发展   12篇
一般理论   886篇
预防医学   189470篇
眼科学   58257篇
药学   184975篇
  11篇
中国医学   4882篇
肿瘤学   135274篇
  2021年   20104篇
  2019年   20647篇
  2018年   29510篇
  2017年   22404篇
  2016年   25554篇
  2015年   28674篇
  2014年   39371篇
  2013年   58570篇
  2012年   81732篇
  2011年   86120篇
  2010年   51008篇
  2009年   47709篇
  2008年   81144篇
  2007年   86738篇
  2006年   87582篇
  2005年   85439篇
  2004年   81607篇
  2003年   78813篇
  2002年   76335篇
  2001年   112676篇
  2000年   115382篇
  1999年   97022篇
  1998年   28183篇
  1997年   24631篇
  1996年   24797篇
  1995年   23315篇
  1994年   21457篇
  1993年   20220篇
  1992年   73624篇
  1991年   71711篇
  1990年   70026篇
  1989年   67261篇
  1988年   61681篇
  1987年   60529篇
  1986年   56519篇
  1985年   54263篇
  1984年   40313篇
  1983年   34220篇
  1982年   20416篇
  1979年   36975篇
  1978年   26461篇
  1977年   21946篇
  1976年   20943篇
  1975年   22725篇
  1974年   27100篇
  1973年   25680篇
  1972年   24069篇
  1971年   22868篇
  1970年   21012篇
  1969年   20008篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
993.
We report histological changes in four patients with port wine stains treated with 578 nm yellow light from a high power copper vapour laser. Histology showed that selective damage occurred to the ectatic blood-vessels in the dermis, without haemorrhage and damage to non-vascular structures, and without scarring. The initial damage to the overlying epidermis was not permanent, and the damaged ectatic vessels returned to normal size or were completely necrosed and replaced by collagen.  相似文献   
994.
The present status of total colectomy with ileorectal anastomosis in the surgical treatment of inflammatory bowel disease is examined. Special reference is made to the different indications for the use of the operation in Crohn's disease and in ulcerative colitis. The late results are illustrated by the outcome in the 59 patients in a personal series, and other published results.  相似文献   
995.
996.
The results of this controlled study of the treatment of 57 patients with Gilles de la Tourette's syndrome suggested that both haloperidol and pimozide were more effective than placebo, but that haloperidol was slightly more effective than pimozide. Adverse effects occurred more frequently with haloperidol vs placebo than with pimozide vs placebo, but the frequency was not significantly different for haloperidol compared with pimozide. Clinically significant cardiac effects did not occur at a maximum dosage of 0.3 mg/kg or 20 mg/d for pimozide and 10 mg/d for haloperidol. However, the QTc interval was prolonged during pimozide treatment compared with that during haloperidol treatment, although the values for both medications were not in an abnormal range.  相似文献   
997.
To date, chronic myopathy has not been reported (to our knowledge) to occur in carnitine palmityltransferase (CPT) deficiency, a disorder of muscle lipid metabolism. We describe two patients with CPT deficiency: a mother, who had a partial CPT deficiency associated with fixed proximal weakness but without rhabdomyolysis, and her son, who had a complete CPT deficiency (95% reduction in enzyme activity) and who suffered from classic attacks of exercise-induced rhabdomyolysis but had normal strength on recovery. Careful examination of family members of patients with complete CPT deficiency is suggested in order to identify clinically affected heterozygotes.  相似文献   
998.
Paracoccidioidomycosis of the central nervous system presents either as meningeal or pseudotumoral lesions. Although occurring more frequently in the brain and meninges, they can occasionally involve the spinal cord. A case of paracoccidioidomycosis in the cervical spinal cord is reported in this paper. Difficulties in establishing the etiologic diagnosis, the importance of radiologic examination of the thorax, and the treatment of the patient are commented. In an extensive review of the literature on the subject, only three other cases have been found, which are also discussed.  相似文献   
999.
We discuss the senescence of the skin considering both intrinsic aging and photoaging; special regard is paid to the various layers, the microcirculation, and the adnexa of the skin. In particular, the barrier function and microcirculation of the skin has been pointed out.  相似文献   
1000.
To assess the relationship between the DSM-III criteria for attention deficit disorder with hyperactivity (ADDH) and the DSM-III-R criteria for attention-deficit hyperactivity disorder (ADHD), children from an inner city parochial school were evaluated using a 30-item teacher questionnaire consisting of the DMS-III and DSM-III-R criteria for these disorders, the revised Conners Parent and Teacher Questionnaires, and a continuous performance test. Diagnostic groups were established based on teacher ratings of the DSM items and evaluated in relation to the rating scale data and continuous performance test. While children who were identified by teachers as having ADDH almost always satisfied the criteria for ADHD, a new group of children who were hyperactive and impulsive but less clearly inattentive also met the criteria for ADHD. Implications of the change in diagnostic criteria are discussed.  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