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   1695526篇
  免费   123747篇
  国内免费   3782篇
耳鼻咽喉   21736篇
儿科学   55647篇
妇产科学   46155篇
基础医学   241240篇
口腔科学   48752篇
临床医学   151327篇
内科学   333523篇
皮肤病学   38651篇
神经病学   131210篇
特种医学   63880篇
外国民族医学   242篇
外科学   257259篇
综合类   38957篇
现状与发展   4篇
一般理论   531篇
预防医学   124243篇
眼科学   40224篇
药学   123633篇
  7篇
中国医学   4475篇
肿瘤学   101359篇
  2021年   12799篇
  2019年   13532篇
  2018年   19961篇
  2017年   15227篇
  2016年   16629篇
  2015年   18973篇
  2014年   26228篇
  2013年   37963篇
  2012年   52756篇
  2011年   55446篇
  2010年   32782篇
  2009年   30703篇
  2008年   51536篇
  2007年   54817篇
  2006年   55274篇
  2005年   52554篇
  2004年   50749篇
  2003年   48161篇
  2002年   46375篇
  2001年   91787篇
  2000年   93609篇
  1999年   76964篇
  1998年   19719篇
  1997年   17267篇
  1996年   17391篇
  1995年   16746篇
  1994年   15289篇
  1993年   14071篇
  1992年   57381篇
  1991年   55273篇
  1990年   52970篇
  1989年   50747篇
  1988年   46135篇
  1987年   44937篇
  1986年   42227篇
  1985年   39988篇
  1984年   29348篇
  1983年   24909篇
  1982年   13898篇
  1979年   25535篇
  1978年   17579篇
  1977年   14907篇
  1976年   13874篇
  1975年   14563篇
  1974年   17630篇
  1973年   16946篇
  1972年   15674篇
  1971年   14455篇
  1970年   13431篇
  1969年   12517篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.

Background and aims

It is not known whether non alcoholic fatty liver disease (NAFLD) is a risk factor for diabetes in non obese, non centrally-obese subjects. Our aim was to investigate relationships between fatty liver, insulin resistance and a biomarker score for liver fibrosis with incident diabetes at follow up, in subjects who were neither obese nor centrally-obese.

Methods and results

As many as 70,303 subjects with a body mass index (BMI) < 25 kg/m2 and without diabetes were followed up for a maximum of 7.9 years. At baseline, fatty liver was identified by liver ultrasound, insulin resistance (IR) by homeostatic model assessment of insulin resistance (HOMA-IR) ≥2.0, and central obesity by waist circumference (waist circumference ≥90 cm (men) and ≥85 cm (women). The Fibrosis-4 (FIB-4 score) was used to estimate extent of liver fibrosis. Cox proportional hazards models adjusted for confounders were used to estimate hazard ratios (aHRs) for incident diabetes. As many as 852 incident cases of diabetes occurred during follow up (median [IQR] 3.71 [2.03] years). Mean ± SD BMI was 22.8 ± 1.8 and 21.7 ± 2.0 kg/m2 in subjects with and without diabetes at follow up. In subjects without central obesity and with fatty liver, aHRs (95% CI) for incident diabetes at follow up were 2.17 (1.56, 3.03) for men, and 2.86 (1.50,5.46) for women. Similar aHRs for incident diabetes occurred with fatty liver, IR and the highest quartile of FIB-4 combined, in men; and there was a non significant trend toward increased risk in women.

Conclusions

In normal weight, non-centrally obese subjects NAFLD is an independent risk factor for incident diabetes.  相似文献   
22.
23.
24.
The Latin American population has a double way of immigration, one toward the United States by proximity and another toward Spain by sociocultural affinity. This population increase is affecting organ donation and transplantation in receiving countries.

Objective

To analyze the brain death (BD) concept knowledge in the Dominican Republic immigrant population in Florida (United States) and Spain.

Method

Population under study: Population born in the Dominican Republic, resident in Florida (United States) and in Spain. Inclusion criteria: Population older than 15 years stratified by age and sex. Assessment instrument: Donation attitude questionnaire PCID-DTO-Ríos. Fieldwork: Random selection based on stratification. Immigration support association collaboration in Florida and Spain was needed to locate potential respondents. Completion was anonymous and self-administered, with verbal consent.

Results

A total of 123 respondents, 57 residents in Spain and 66 in Florida, have been included in the study. The 27% (n = 33) of the respondents knowledgeable of the BD concept consider it the death of an individual. Of the remainder, 52% (n = 64) do not know about it, and the remaining 21% (n = 26) believe it does not mean the death of a patient. No differences were observed regarding migration countries (P > .05). There was no association of the BD concept with other psychosocial factors analyzed or with the attitude toward organ donation.

Conclusions

Knowledge of the BD concept among the Dominican immigrant population is similar in Spain and Florida, and, unlike most studies, there is no objective association with the attitude toward organ donation.  相似文献   
25.
26.
27.
28.
29.
30.
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