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   3258363篇
  免费   226098篇
  国内免费   8442篇
耳鼻咽喉   44813篇
儿科学   107927篇
妇产科学   90280篇
基础医学   458326篇
口腔科学   89594篇
临床医学   296267篇
内科学   633523篇
皮肤病学   78031篇
神经病学   263626篇
特种医学   125669篇
外国民族医学   918篇
外科学   486000篇
综合类   65441篇
现状与发展   6篇
一般理论   1175篇
预防医学   246010篇
眼科学   73744篇
药学   243405篇
  13篇
中国医学   7089篇
肿瘤学   181046篇
  2019年   25502篇
  2018年   36036篇
  2017年   27893篇
  2016年   32226篇
  2015年   36163篇
  2014年   49638篇
  2013年   74253篇
  2012年   99067篇
  2011年   104730篇
  2010年   63014篇
  2009年   60181篇
  2008年   97605篇
  2007年   103846篇
  2006年   105706篇
  2005年   101328篇
  2004年   97357篇
  2003年   93917篇
  2002年   90687篇
  2001年   159349篇
  2000年   163402篇
  1999年   137518篇
  1998年   38865篇
  1997年   34495篇
  1996年   34689篇
  1995年   33512篇
  1994年   30535篇
  1993年   28642篇
  1992年   106379篇
  1991年   102417篇
  1990年   99591篇
  1989年   96347篇
  1988年   88010篇
  1987年   85998篇
  1986年   80894篇
  1985年   76970篇
  1984年   57115篇
  1983年   48133篇
  1982年   28291篇
  1981年   25074篇
  1979年   50564篇
  1978年   35263篇
  1977年   30597篇
  1976年   27779篇
  1975年   30124篇
  1974年   35366篇
  1973年   33748篇
  1972年   31863篇
  1971年   29628篇
  1970年   27242篇
  1969年   26231篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
991.
The question of the necessity of in-patient facilities of the area of (child and) adolescent neuropsychiatry is to be discussed further. The extremely optimistic views on this question of approximately 20 years ago cannot be maintained for the examined area and the examination time. In the LNKH Valduna/Vorarlberg, an establishment that was intended exclusively for adults until 1987, from 1980-1984 (evaluated in detail) and from 1984-1987 a further 60 minors were admitted. The exact evaluation shows that the conspicuousnesses of behaviour of a main group was so clear each time that it could not be treated elsewhere and certainly not in outpatient facilities. In the examined group the amount of patients with behaviour and socialization disorders outweighed by far the psychoses, also a high percentage of patients was multi morbid and/or had multiple handicaps. The resulting conclusion seems to us to be the necessity of setting-up a specific in-patients treatment unit for this group of patients with sufficient infrastructure.  相似文献   
992.
Tumor material from 91 patients with squamous cell carcinoma of the head and neck was transplanted subcutaneously in athymic nude mice. In the first (man to mouse) passage, the calculated mean probability of tumor take in a single mouse was 11%. The probability of growth in the first passage was significantly better for moderately and poorly differentiated tumors than for well-differentiated tumors. Also, the implantation of lymph node material resulted in a significantly better tumor take rate than material taken from a primary tumor. Transplantability was not dependent on the following characteristics: localization, T or N stage of the tumor, or the sex of the patients. Once growth was established, all variables studied had no influence on the probability of growth in the subsequent mouse passages. A relationship between tumor growth in nude mice and patient prognosis could not be found. When transplanting head and neck squamous cell carcinoma in nude mice, it has to be recognized that some tumor characteristics will influence the success of tumor growth.  相似文献   
993.
994.
995.
A case study of a family referred for clarification of cultural issues illustrates how a transcultural psychiatric service developed in the pediatric hospital setting can be used to advantage. A Vietnamese family with an inherited disorder. Mucopolysaccharidosis type VI (Maroteaux-Lamy syndrome, MPS VI), resisted genetic counseling and contraception. Three out of their six children were affected, one with a fatal outcome. The transcultural consultation offered an understanding of their behavior and facilitated subsequent management.  相似文献   
996.
This paper reports the results of an experimental study modeled after a study conducted by Kaplan et al. The hypothesis tested was: Adolescents who receive a social learning intervention (SLI) will show greater improvement in metabolic control of their diabetes than will adolescents who receive only traditional diabetes instruction. Thirty-four adolescents between the ages of 12 and 16 who attended a midwestern camp were randomly divided into two groups. Both groups attended a daily 1-hour teaching session about diabetes. Later each day, the experimental group received an SLI consisting of role modeling to help the subjects circumvent peer pressure. To determine metabolic control, HbA1 values were determined before and 3 1/2 months after the intervention. The control group showed no significant difference in HbA1 values, while the experimental group showed a decrease in metabolic control.  相似文献   
997.
Gram negative endotoxins play a contributory role in the syndrome which results from over consumption of carbohydrates by horses and ponies. Since the antibiotic polymyxin B exerts a direct anti-endotoxin effect by chemically modifying the active lipid A moiety of endotoxin, it might be expected to protect horses after carbohydrate overload and provide a new therapeutic and experimental tool for this condition. The present study was undertaken to evaluate the effect of polymyxin B on hemostatic, hemodynamic, acid-base, and clinical aspects of the syndrome resulting from carbohydrate overload. Experimentally-induced carbohydrate overload resulted in lactic acidosis, hypercoagulability, hypovolemic shock and lameness. Although there was a slight delay in the onset of clinical signs resulting from experimental carbohydrate overload in treated animals, polymyxin B administered iv at 2.5 mg/kg every 6 hr failed to significantly ameliorate the coagulopathy, acidosis, lameness and shock induced by alimentary carbohydrate overload.  相似文献   
998.
The toenails and the rest of the human foot are constantly sandwiched in shoes, traumatized, and poorly supplied with blood that is necessary for normal morphology and function, resulting in more abnormal changes of the toenails (onychopathies). This article discusses briefly the following: (1) the conditions that are commonly seen in feet by podiatric practitioners; (2) clinical signs, symptoms, and etiology; and (3) differential diagnosis and care of the conditions.  相似文献   
999.
Herniation of a thoracic disc in an acromegalic giant is reported. Degenerative changes in the spine in association with dorsal kyphosis, and the additional strain, resulted in the disc prolapse.  相似文献   
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