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   2194027篇
  免费   151990篇
  国内免费   3538篇
耳鼻咽喉   31690篇
儿科学   69758篇
妇产科学   58805篇
基础医学   309104篇
口腔科学   62539篇
临床医学   189462篇
内科学   431126篇
皮肤病学   47387篇
神经病学   168408篇
特种医学   89566篇
外国民族医学   813篇
外科学   344407篇
综合类   42986篇
现状与发展   2篇
一般理论   577篇
预防医学   159635篇
眼科学   49365篇
药学   165407篇
  7篇
中国医学   4304篇
肿瘤学   124207篇
  2018年   23231篇
  2017年   18894篇
  2016年   19890篇
  2015年   23483篇
  2014年   30338篇
  2013年   43066篇
  2012年   63331篇
  2011年   61831篇
  2010年   36467篇
  2009年   36365篇
  2008年   57804篇
  2007年   62005篇
  2006年   63047篇
  2005年   68526篇
  2004年   68446篇
  2003年   62476篇
  2002年   57167篇
  2001年   110007篇
  2000年   112646篇
  1999年   97564篇
  1998年   24253篇
  1997年   21530篇
  1996年   21992篇
  1995年   20739篇
  1994年   19418篇
  1993年   17931篇
  1992年   77508篇
  1991年   75595篇
  1990年   73714篇
  1989年   71010篇
  1988年   65230篇
  1987年   63804篇
  1986年   59686篇
  1985年   56978篇
  1984年   41562篇
  1983年   35037篇
  1982年   18934篇
  1981年   16813篇
  1979年   37603篇
  1978年   25586篇
  1977年   21724篇
  1976年   19561篇
  1975年   22035篇
  1974年   26240篇
  1973年   24845篇
  1972年   23361篇
  1971年   21845篇
  1970年   20639篇
  1969年   19108篇
  1968年   17374篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Attachment is a behavioral and physiological system, which enables individual’s dynamic adaptation to its environment. Attachment develops in close interaction between an infant and his/her mother, plays an important role in the development of the infant’s brain, and influences the quality of interpersonal relationships throughout life.Security of attachment is believed to influence individual response to stress, exposing insecurely organized individuals to deregulated autonomic nervous system and exaggerated hypothalamic-pituitary-adrenal activity, which, in turn, produces increased and prolonged exposure to stress-hormones. Such stress responses may have considerable implications for the development of diverse health-risk conditions, such as insulin resistance and hyperlipidemia, shown by numerous studies.Although the mechanisms are not yet fully understood, there is compelling evidence highlighting the role of psychological stress in the development of type 1 diabetes (T1D). One of the possible contributing factors for the development of T1D may be the influence of attachment security on individual stress reactivity. Thus, the suggestion is that insecurely attached individuals are more prone to experience increased and prolonged influence of stress hormones and other mechanisms causing pancreatic beta-cell destruction.The present paper opens with a short overview of the field of attachment in children, the principal attachment classifications and their historic development, describes the influence of attachment security on individual stress-reactivity and the role of the latter in the development of T1D. Following is a review of recent literature on the attachment in patients with T1D with a conclusion of a proposed role of attachment organization in the etiology of T1D.  相似文献   
63.
64.
Background. Haemophagocytic lymphohistiocytosis (HLH) is a rare clinical syndrome characterized by fever, hepatosplenomegaly, cytopenia, and progressive multiple-organ failure. HLH in adults is often secondary to autoimmune diseases, cancer, or infections in contrast to familial HLH. Treatment of secondary HLH is directed against the triggering disease in addition to immunosuppressive therapy, the latter commonly according to the HLH-2004 protocol.Methods. We conducted a retrospective study to identify triggering diseases, disease-specific and immunosuppressive therapy administered, and prognosis in adult patients with secondary HLH. Patient data were collected from October 2010 to January 2015.Results. Ten adult patients with secondary HLH were identified. Seven were men, and the median age at diagnosis was 62 years. Five cases were triggered by malignant disease and five by infection. The median patient fulfilled five of the eight HLH-2004 diagnostic criteria. All patients fulfilled the criteria fever, cytopenia, and ferritin >500 µg/L. Median time from hospital admission to HLH diagnosis was 20 days. Four patients received immunosuppressive therapy according to the HLH-2004 protocol. The prognosis was dismal, especially for the patients with malignancy-associated HLH, of whom all died.Conclusion. HLH should be suspected in patients who present with fever, cytopenia, and ferritin >500 µg/L. Secondary HLH has a dismal prognosis. None of the patients with HLH triggered by malignancy survived. Achieving remission of the triggering disease seems to be important for a favourable outcome as, in all surviving patients, the haemophagocytic syndrome resolved after remission of the underlying infection.  相似文献   
65.
66.
Obtaining accurate assessment data from adolescents in treatment aids clinical decision making and facilitates more accurate outcome evaluations. However, findings could be biased due to underreported substance use and mental health symptoms. This article compares self-reports of youth in non-White matched client–assessor dyads and those in nonmatched dyads. There were no differences on self-reported substance use, but matched youth reported significantly fewer attention deficit/hyperactivity disorder symptoms versus the comparison group. One possible reason for these findings is the effect of in-group stereotype threat. Future studies should examine the potential effect that in-group stereotyping and perceived racism have on the therapeutic relationship.  相似文献   
67.
68.
69.
70.
Blecha  S.  Weber-Carstens  S.  Bein  T. 《Der Anaesthesist》2019,68(6):343-352
Die Anaesthesiologie - Die Versorgungsforschung (VF) ist ein fachübergreifendes multidisziplinäres Forschungsgebiet, das die Kranken- und Gesundheitsversorgung sowie ihre...  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