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   2560篇
  免费   147篇
  国内免费   11篇
耳鼻咽喉   55篇
儿科学   88篇
妇产科学   103篇
基础医学   329篇
口腔科学   50篇
临床医学   202篇
内科学   584篇
皮肤病学   26篇
神经病学   257篇
特种医学   137篇
外国民族医学   1篇
外科学   385篇
综合类   6篇
一般理论   1篇
预防医学   173篇
眼科学   43篇
药学   178篇
中国医学   6篇
肿瘤学   94篇
  2023年   17篇
  2022年   29篇
  2021年   47篇
  2020年   29篇
  2019年   46篇
  2018年   43篇
  2017年   41篇
  2016年   56篇
  2015年   64篇
  2014年   70篇
  2013年   106篇
  2012年   169篇
  2011年   158篇
  2010年   108篇
  2009年   98篇
  2008年   135篇
  2007年   137篇
  2006年   133篇
  2005年   140篇
  2004年   121篇
  2003年   132篇
  2002年   102篇
  2001年   69篇
  2000年   78篇
  1999年   74篇
  1998年   28篇
  1997年   22篇
  1996年   22篇
  1995年   14篇
  1994年   19篇
  1993年   17篇
  1992年   48篇
  1991年   39篇
  1990年   33篇
  1989年   32篇
  1988年   34篇
  1987年   18篇
  1986年   19篇
  1985年   17篇
  1984年   11篇
  1983年   9篇
  1982年   8篇
  1980年   8篇
  1979年   16篇
  1978年   10篇
  1976年   13篇
  1973年   7篇
  1971年   7篇
  1970年   9篇
  1967年   9篇
排序方式: 共有2718条查询结果,搜索用时 0 毫秒
101.
102.
103.
104.
105.
The conventional view is that perceptual/cognitive development is an incremental process of acquisition. Several striking findings have revealed, however, that the sensitivity to non-native languages, faces, vocalizations, and music that is present early in life declines as infants acquire experience with native perceptual inputs. In the language domain, the decline in sensitivity is reflected in a process of perceptual narrowing that is thought to play a critical role during the acquisition of a native-language phonological system. Here, we provide evidence that such a decline also occurs in infant response to multisensory speech. We found that infant intersensory response to a non-native phonetic contrast narrows between 6 and 11 months of age, suggesting that the perceptual system becomes increasingly more tuned to key native-language audiovisual correspondences. Our findings lend support to the notion that perceptual narrowing is a domain-general as well as a pan-sensory developmental process.  相似文献   
106.

Background  

We previously reported risk haplotypes for two genes related with serotonin and dopamine metabolism: MAOA in migraine without aura and DDC in migraine with aura. Herein we investigate the contribution to migraine susceptibility of eight additional genes involved in dopamine neurotransmission.  相似文献   
107.
IntroductionThe popular belief advocates the use of sitz (sitting) baths with cold water for the treatment of acute anal pain, but clinical practice guides recommend the use of hot water for its known effect on the at-rest anal pressure.AimThe objective of the study was to examine the analgesic effect on the quality of life, manometer data and clinical progress, of the two temperatures in sitz baths in patients with anal pain.Material and methodsA randomised clinical trial on patients with acute anal pain due to haemorrhoids or anal fissures, divided into Group 1: Sitz baths with water at a temperature of less than 15 °C, and Group 2: Baths with a water temperature above 30 °C. The analgesia was the same in both groups. An analysis was made of the pain at 7 days (visual analogue scale), quality of life (SF-36), anal at-rest pressure and disease progress.ResultsOf the 27 eligible patients, 24 were randomised (Group 1: n=12 y Group 2: n=12). There were no statistical differences in pain, but it remained stable in Group 1, but gradually decreased in the patients of Group 2, the difference being in the pain scores on the first day compared to the seventh in Group 2 (p=0.244). The rest of the variables were similar.ConclusionThere were no statistically significant differences in pain control from day 1 to day 7 in the Group with sitz baths with hot water.(ISRCTN Number: 50105150).  相似文献   
108.
BACKGROUND: Breast cancer is the commonest solid tumor observed during pregnancy. Anthracycline-based chemotherapy is feasible during the 2nd and 3rd trimesters of pregnancy, but few data are available on recent and highly active drugs taxanes, vinorelbine and anti-HER-2 agents in this setting. PATIENTS AND METHODS: We carried out a comprehensive review of reports documenting the use of taxanes, vinorelbine, trastuzumab and lapatinib during pregnancy in the English literature, in order to evaluate their safety profile in pregnant patients. RESULTS: Twenty-four pregnancies are described, in which no grade 3-4 maternal toxicity nor malformation in the offspring was reported. Whereas only one report studied the pharmacokinetics of paclitaxel (Taxol) during pregnancy, several preclinical reports indicate that the placental P-glycoprotein could prevent the transplacental transfer of taxanes and vinorelbine. The use of trastuzumab was associated with the occurrence of anhydramnios in three of six cases. CONCLUSION: The administration of recent drugs taxanes and vinorelbine seems feasible during the 2nd and 3rd trimesters of pregnancy, with a favorable toxicity profile. In contrast, anti-HER-2 agents may obscure the normal development of the fetal kidney, and should be avoided during pregnancy.  相似文献   
109.
A normal infant was born to a 25 year-old mother with phenylketonuria who had never been treated. The mother had been fed a phenylalanine restricted diet for 3 months before the beginning of the pregnancy. Dietary control was maintained throughout the whole gestation. The problems of dietary control in a mentally retarded woman are analysed.  相似文献   
110.
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