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   709089篇
  免费   50130篇
  国内免费   1311篇
耳鼻咽喉   9209篇
儿科学   23381篇
妇产科学   17649篇
基础医学   110879篇
口腔科学   20096篇
临床医学   64020篇
内科学   135298篇
皮肤病学   16205篇
神经病学   49731篇
特种医学   25900篇
外国民族医学   76篇
外科学   105244篇
综合类   14833篇
现状与发展   2篇
一般理论   160篇
预防医学   51644篇
眼科学   16365篇
药学   54423篇
  3篇
中国医学   2361篇
肿瘤学   43051篇
  2021年   5516篇
  2018年   7926篇
  2017年   6175篇
  2016年   6890篇
  2015年   7615篇
  2014年   10358篇
  2013年   15525篇
  2012年   20687篇
  2011年   21732篇
  2010年   12845篇
  2009年   12009篇
  2008年   20165篇
  2007年   21711篇
  2006年   22089篇
  2005年   20660篇
  2004年   20187篇
  2003年   19118篇
  2002年   18646篇
  2001年   36484篇
  2000年   37030篇
  1999年   30527篇
  1998年   7935篇
  1997年   6715篇
  1996年   7024篇
  1995年   6672篇
  1994年   6145篇
  1993年   5640篇
  1992年   23103篇
  1991年   23055篇
  1990年   22417篇
  1989年   22178篇
  1988年   20121篇
  1987年   19500篇
  1986年   18554篇
  1985年   17387篇
  1984年   12748篇
  1983年   10792篇
  1982年   5946篇
  1979年   11553篇
  1978年   8145篇
  1977年   6843篇
  1976年   6605篇
  1975年   7291篇
  1974年   8523篇
  1973年   8155篇
  1972年   7677篇
  1971年   7144篇
  1970年   6894篇
  1969年   6323篇
  1968年   5799篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Early onset periodontitis is rarely seen in infants, though often leads to an acute and serious clinical course when encountered in such patients. Autoimmune neutropenia presents systemic and dental symptoms, as depressed resistance to bacterial infection is caused by a disorder that reduces the number of neutrophils. This disease can result in not only gingival inflammation but also destruction of periodontal tissues, such as attachment loss, alveolar bone absorption, and early tooth loss in primary as well as mixed dentition. Here, we report treatment of a child with marginal periodontitis from the age of 3 years–7 years 9 months. No systemic manifestations were noted until 3 years of age, thus the patient had never received a detailed examination or medication related to the disease. Following examinations at our department, we referred the patient to a pediatrician at our university hospital for possible systemic disease, who made a diagnosis of autoimmune neutropenia. Although administration of antibiotics and professional dental care were continued, neutrophil count was not increased and progressive periodontal destruction was observed. Extraction of teeth with poor prognosis was performed and a prosthetic strategy for the missing teeth developed. It is important to recognize that periodontitis along with autoimmune neutropenia can appear in infants, even though the incidence is quite low. Early detection and early treatment of this disease is necessary for delaying progression of periodontitis and optimal occlusal induction of permanent teeth.  相似文献   
92.
93.
94.
95.
96.
FGFR–TACC, found in different tumor types, is characterized by the fusion of a member of fibroblast grown factor receptor (FGFR) tyrosine kinase (TK) family to a member of the transforming acidic coiled-coil (TACC) proteins. Because chromosome numerical alterations, hallmarks of FGFR–TACC fusions are present in many hematological disorders and there are no data on the prevalence, we studied a series of patients with acute myeloid leukemia and myelodysplastic syndrome who presented numerical alterations using cytogenetic traditional analysis. None of the analyzed samples showed FGFR3–TACC3 gene fusion, so screening for this mutation at diagnosis is not recommended.  相似文献   
97.
98.
99.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  相似文献   
100.
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