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   3213603篇
  免费   257576篇
  国内免费   9337篇
耳鼻咽喉   45299篇
儿科学   100935篇
妇产科学   86578篇
基础医学   447053篇
口腔科学   92330篇
临床医学   293763篇
内科学   635253篇
皮肤病学   69790篇
神经病学   269816篇
特种医学   129045篇
外国民族医学   1111篇
外科学   489960篇
综合类   76929篇
现状与发展   3篇
一般理论   1306篇
预防医学   262532篇
眼科学   73687篇
药学   233816篇
  9篇
中国医学   5792篇
肿瘤学   165509篇
  2018年   32965篇
  2016年   29308篇
  2015年   32985篇
  2014年   46970篇
  2013年   71269篇
  2012年   92487篇
  2011年   98506篇
  2010年   59414篇
  2009年   57268篇
  2008年   92984篇
  2007年   98984篇
  2006年   100045篇
  2005年   97426篇
  2004年   93523篇
  2003年   90585篇
  2002年   88195篇
  2001年   147445篇
  2000年   152414篇
  1999年   128354篇
  1998年   38636篇
  1997年   34850篇
  1996年   35167篇
  1995年   34634篇
  1994年   32467篇
  1993年   30392篇
  1992年   104896篇
  1991年   101669篇
  1990年   98095篇
  1989年   93973篇
  1988年   87455篇
  1987年   86243篇
  1986年   81621篇
  1985年   78443篇
  1984年   59782篇
  1983年   50948篇
  1982年   31501篇
  1981年   28333篇
  1980年   26665篇
  1979年   55687篇
  1978年   39818篇
  1977年   33540篇
  1976年   31338篇
  1975年   32902篇
  1974年   40088篇
  1973年   38184篇
  1972年   35712篇
  1971年   33097篇
  1970年   30931篇
  1969年   28792篇
  1968年   26482篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
Twenty two patients (age range: 1 month to 11 years) were treated for congenital diaphragmatic defects (excluding hiatus hernia) in the six year period 1983-8. Presenting features were failure to thrive (n = 7), abdominal pain and vomiting (n = 4), chronic respiratory symptoms (n = 3), and inability to wean from ventilatory support (n = 3). The defect was an incidental finding in five patients. Operative repair was performed with no mortality or serious postoperative morbidity. Dramatic improvement occurred in 15 of the 17 symptomatic patients. Awareness of the differential diagnosis should avoid delay in diagnosis or inappropriate treatment. Surgical correction is strongly recommended in all cases.  相似文献   
992.
993.
We reviewed the clinical findings in 10 patients with lysyl hydroxylase deficiency (Ehlers-Danlos syndrome type VI) and report here the range of clinical severity in these patients. The distinctive feature common to all patients was muscle hypotonia with joint laxity in the newborn period, and moderate to severe kyphoscoliosis either was present or developed in almost all patients. Most patients also had some degree of skin abnormality observed in other types of Ehlers-Danlos syndrome: bruisability, abnormal scarring, and soft, distensible skin. These patients also are at risk for potentially catastrophic arterial rupture.  相似文献   
994.
995.
996.
Five cases of unilateral vocal cord paralysis/paresis were diagnosed following extracorporeal membrane oxygenation for newborn respiratory failure. All were right sided and transient in nature. None of the five patients had other findings commonly associated with vocal cord palsy. The extracorporeal membrane oxygenation procedure requires surgical dissection in the carotid sheath on the right side of the neck, an area immediately adjacent to both the vagus and recurrent laryngeal nerve. It is speculated that vocal cord paralysis in these infants was acquired as a result of the extracorporeal membrane oxygenation cannulation. Although the vocal cord paralysis resolved in all cases, two patients had difficult courses after extracorporeal membrane oxygenation. Therefore, laryngoscopic examination should be considered for patients after extracorporeal membrane oxygenation.  相似文献   
997.
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   
998.
999.
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   
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