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   1617篇
  免费   82篇
  国内免费   4篇
耳鼻咽喉   15篇
儿科学   38篇
妇产科学   32篇
基础医学   242篇
口腔科学   161篇
临床医学   71篇
内科学   300篇
皮肤病学   10篇
神经病学   170篇
特种医学   50篇
外科学   295篇
综合类   14篇
预防医学   116篇
眼科学   20篇
药学   95篇
中国医学   9篇
肿瘤学   65篇
  2023年   10篇
  2022年   23篇
  2021年   40篇
  2020年   29篇
  2019年   22篇
  2018年   39篇
  2017年   32篇
  2016年   45篇
  2015年   59篇
  2014年   51篇
  2013年   93篇
  2012年   145篇
  2011年   148篇
  2010年   81篇
  2009年   77篇
  2008年   126篇
  2007年   133篇
  2006年   100篇
  2005年   102篇
  2004年   82篇
  2003年   83篇
  2002年   68篇
  2001年   3篇
  2000年   5篇
  1999年   4篇
  1998年   8篇
  1997年   6篇
  1996年   6篇
  1995年   4篇
  1994年   7篇
  1993年   2篇
  1992年   4篇
  1991年   4篇
  1990年   5篇
  1989年   4篇
  1987年   3篇
  1986年   2篇
  1985年   2篇
  1984年   5篇
  1980年   4篇
  1978年   3篇
  1976年   3篇
  1975年   2篇
  1973年   3篇
  1972年   6篇
  1969年   5篇
  1968年   2篇
  1964年   2篇
  1959年   2篇
  1946年   1篇
排序方式: 共有1703条查询结果,搜索用时 0 毫秒
21.
22.
We present a small child with febrile peaks and syncopal episodes secundary to ventricular tachycardia, in whom it was eventually possible to demostrate the Brugada Syndrome with a special presentation in the ECG; early repolarization pattern in lead I and a aVL and Brugada pattern during fever in V1‐V2. This is, to our knowledge, tha first case with this special ECG presentation in a small child.  相似文献   
23.
Toxocara spp. infection and the seroconversion rate in the Amazon have been poorly investigated. This study analyzed individual and household-level risk factors for the presence of IgG antibodies to Toxocara spp. in urban Amazonian children over a period of 7 years and evaluated the seroconversion rates over a 1-year follow-up. In children < 59 months of age, the overall prevalence rate was 28.08% in 2003 and 23.35% in 2010. The 2010–2011 seroconversion rates were 13.90% for children 6–59 months of age and 12.30% for children 84–143 months of age. Multilevel logistic regression analysis identified child age, previous wheezing, and current infection with hookworm as significant associated factors for Toxocara spp. seropositivity in 2003. In 2010, age, previous helminthiasis, and having a dog were associated with seropositivity, whereas having piped water inside the household was a protective factor. Control programs mainly need to target at-risk children, water quality control, and animal deworming strategies.  相似文献   
24.
25.
ABSTRACT: BACKGROUND: The aim of this study was to determine the acute effects of exercise intensity on anxiety, mood states and hunger in obese adolescents. METHODS: Subjects were eight male obese adolescents (age 15.44 +/- 2.06y; BMI 33.06 +/- 4.78 kg/m2). Each subject underwent three experimental trials: 1) Control, seated for 30 min; 2) Low intensity exercise (LIE) - exercise at 10% below ventilatory threshold (VT); 3) High intensity exercise (HIE) - exercise at 10% above VT. Anxiety (STAI Trait/State), mood (POMS) and hunger (VAS) were assessed before and immediately after the experimental sessions. Comparisons between trials and times were assessed using Kruskal-Wallis and Wilcoxon tests, respectively. Associations between variables were described using a Spearman test. RESULTS: The largest increase in hunger was observed after LEI (914.22%). Both exercise sessions increased anxiety, fatigue and decreased vigor (p < 0.05). CONCLUSIONS: Acute exercise bouts are associated with negative changes in anxiety and mood, and with increases in hunger in obese adolescents.  相似文献   
26.
27.
28.
29.
Backgrounds/Aims: Intense pruritus and the risk of stillbirths and premature deliveries justify the search for an effective pharmacologic treatment of intrahepatic cholestasis of pregnancy. This study was designed to test the efficacy of ursodeoxycholic acid in maternal pruritus, the biochemical abnormalities and the outcome of pregnancy, in patients with intrahepatic cholestasis of pregnancy of early onset.Methods: Pregnant patients hospitalized in a secondary case-referral center with intense pruritus and abnormal serum levels of bile salts and aminotransferases, detected before week 33 of pregnancy, were randomly assigned to receive ursodeoxycholic acid, 1 g per day orally, or an identical placebo, until delivery, in a double-blind study. A 3-week trial period was chosen to compare drug and placebo effects. The follow-up was extended for 3 months after delivery.Results: Twenty-four patients entered the trial; eight had deliveries before 2 weeks of treatment and one dropped out. The study was then completed in 15 patients: eight received ursodeoxycholic acid and seven placebo. No adverse effects were detected in the mother or in their babies. After 3 week of treatment, patients receiving ursodeoxycholic acid (mean daily) dose 16 mg/kg body weight) had a significant improvement in pruritus (p<0.02), In serum bilirubin (0.36±0.19 mg/dl (mean±SD) versus 0.95±0.48 in patients receiving placebo, p<0.01), in aspartate aminostransferase (52±42 IU/l vs 98±44, p<0.05) and in alanine aminotransferase (54±50 IU/l vs 229±154, p<0.01); serum total bile salts also tended to be lower in patients receiving ursodeoxycholic acid (26.3±33.7 μmol/l vs 55.0±44.8, p N.S.). Deliveries occurred at or near term in all mothers who received ursodeoxycholic acid (mean week of pregnancy: 38), while they occurred before week 36 of pregnancy in five patients who received placebo, including one stillbirth. All babies born alive had birth weights adequate for gestational age and they were thriving normally 3 months after delivery.Conclusions: Ursodeoxycholic acid is effective and safe in patients with intrahepatic cholestasis of pregnancy of early onset, attenuating pruritus and correcting some biochemical abnormalities in the mothers. Relevant aspects of fetal outcome were also improved in patients receiving ursodeoxycholic acid compared to placebo.  相似文献   
30.
Biogerontology - Senescent cells accumulate within tissues during aging and secrete an array of pro-inflammatory molecules known as senescent-associated secretory phenotype (SASP), which contribute...  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