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   2488156篇
  免费   185176篇
  国内免费   6078篇
耳鼻咽喉   35193篇
儿科学   78905篇
妇产科学   71998篇
基础医学   349465篇
口腔科学   71356篇
临床医学   217832篇
内科学   490248篇
皮肤病学   57401篇
神经病学   201937篇
特种医学   96475篇
外国民族医学   882篇
外科学   378124篇
综合类   59034篇
现状与发展   11篇
一般理论   868篇
预防医学   185287篇
眼科学   58230篇
药学   181413篇
  11篇
中国医学   5992篇
肿瘤学   138748篇
  2018年   25791篇
  2017年   20085篇
  2016年   22400篇
  2015年   25314篇
  2014年   35727篇
  2013年   53553篇
  2012年   71613篇
  2011年   75827篇
  2010年   44869篇
  2009年   43106篇
  2008年   71026篇
  2007年   76055篇
  2006年   77057篇
  2005年   74794篇
  2004年   71776篇
  2003年   68866篇
  2002年   67290篇
  2001年   119415篇
  2000年   122528篇
  1999年   102911篇
  1998年   28600篇
  1997年   25974篇
  1996年   25479篇
  1995年   24148篇
  1994年   22254篇
  1993年   20758篇
  1992年   78746篇
  1991年   75681篇
  1990年   73485篇
  1989年   70931篇
  1988年   65679篇
  1987年   64283篇
  1986年   61132篇
  1985年   58007篇
  1984年   43971篇
  1983年   37202篇
  1982年   22573篇
  1981年   20354篇
  1979年   40540篇
  1978年   28795篇
  1977年   24583篇
  1976年   22559篇
  1975年   24665篇
  1974年   29302篇
  1973年   28527篇
  1972年   27050篇
  1971年   24911篇
  1970年   23757篇
  1969年   22531篇
  1968年   21265篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
66.
67.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  相似文献   
68.
OBJECTIVE: To assess the effect of glucose control on the rate of growth of fetuses in women with pregestational diabetes mellitus (Types 1 and 2). METHODS: All pregestational diabetic women booked at Mater Mothers' Hospital, Brisbane, Australia, between 1 January 1994 and 31 December 2002, were included. Pregnancies with congenital fetal anomalies, multiple pregnancies, and pregnancies terminated prior to 20 weeks' gestation were excluded. Dating scans were performed before 14 weeks' gestation and serial scans were performed at 18, 24, 28, 32 and 36 weeks. Fetal parameters, including biparietal diameter, femur length and abdominal circumference, were recorded. The daily growth rates for biparietal diameter, femur length, and fetal abdominal area were calculated and compared with those in a low-risk (non-diabetic) population. The growth rates in fetuses of women with satisfactory diabetic control (HbA1c < 6.5%) and unsatisfactory control (HbA1c > or = 6.5%) in the three trimesters were compared. RESULTS: A total of 174 diabetic pregnancies were included and a total of 997 ultrasound scans were performed. The growth rates for fetuses of mothers with diabetes mellitus were significantly higher than for those in the low-risk population. The z-scores for biparietal diameter, femur length, and fetal abdominal area were 0.18, 0.59 and 1.44, respectively. Fetuses of diabetic mothers with high HbA1c in the first trimester had significantly greater fetal abdominal area growth rate than those with normal HbA1c (fetal abdominal area z-score of 1.7 vs. 0.75, P = 0.009). Although the fetal abdominal area z-scores in fetuses of diabetic mothers with high HbA1c in the second or third trimesters were also higher than those with normal HbA1c levels, the differences did not reach statistical significance. Maternal obesity did not influence the fetal growth rate. CONCLUSION: The rate of growth of fetuses of diabetic mothers differs from that of the normal population. Growth acceleration persists until the late third trimester. Moreover, periconceptional glucose control appears to have a significant effect on accelerated growth of the fetal abdominal area.  相似文献   
69.
70.
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