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   75819篇
  免费   4795篇
  国内免费   297篇
耳鼻咽喉   801篇
儿科学   3625篇
妇产科学   1423篇
基础医学   9269篇
口腔科学   1749篇
临床医学   6346篇
内科学   15251篇
皮肤病学   1678篇
神经病学   6165篇
特种医学   2312篇
外国民族医学   1篇
外科学   11110篇
综合类   1788篇
一般理论   47篇
预防医学   5015篇
眼科学   2109篇
药学   6567篇
  1篇
中国医学   401篇
肿瘤学   5253篇
  2023年   487篇
  2022年   1025篇
  2021年   2288篇
  2020年   1352篇
  2019年   1666篇
  2018年   2177篇
  2017年   1613篇
  2016年   1993篇
  2015年   2130篇
  2014年   3097篇
  2013年   3834篇
  2012年   5498篇
  2011年   5706篇
  2010年   3307篇
  2009年   2805篇
  2008年   4298篇
  2007年   4618篇
  2006年   4308篇
  2005年   4187篇
  2004年   3824篇
  2003年   3477篇
  2002年   3125篇
  2001年   1105篇
  2000年   962篇
  1999年   975篇
  1998年   710篇
  1997年   548篇
  1996年   553篇
  1995年   459篇
  1994年   395篇
  1993年   401篇
  1992年   576篇
  1991年   553篇
  1990年   537篇
  1989年   487篇
  1988年   455篇
  1987年   392篇
  1986年   351篇
  1985年   405篇
  1984年   420篇
  1983年   327篇
  1982年   310篇
  1981年   323篇
  1980年   309篇
  1979年   225篇
  1978年   201篇
  1977年   214篇
  1976年   179篇
  1974年   146篇
  1973年   138篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Treatment guidelines for management of uncomplicated gonorrhoeae have been recently modified owing to alarming upsurge in azithromycin resistance. This study investigated the prevalence and genetic determinants of gonococcal azithromycin resistance in India. Four (5.7%) of 70 gonococcal isolates were resistant to azithromycin. Of 16 isolates investigated for molecular mechanisms of resistance, 13 (81.3%) and 6 (37.5%) isolates exhibited mutations in coding and promoter regions of mtrR gene, respectively. However, ermA, ermB and ermC genes or mutations in rrl gene were absent in all isolates. Azithromycin resistance is low in India posing no immediate threat to use of dual-therapy for syndromic management.  相似文献   
2.
3.
4.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  相似文献   
5.
6.
7.
Coronary embolism (CE) is an uncommon and unique cause of acute myocardial infarction. In this report, we review 216 cases of CE including 2 new cases from our institution. The mean patient age was 52.5 years and 62% of the patients were males. Chest pain was the most common presenting symptom followed by dyspnea, and the most commonly affected vessel was the left anterior descending artery. Leading etiologies of the embolus were atrial fibrillation, septic emboli, and iatrogenic causes. Treatment approaches varied with thrombus aspiration being used in 30% of cases. In-hospital mortality rate was 36% and 13% of the cases were complicated by cerebrovascular accident. CE is a unique pathology that leads to acute myocardial infarction. It portends a high mortality rate and requires a high level of suspicion as symptoms may be misleading. Further research is needed in order to improve recognition and management and to lower associated mortality.  相似文献   
8.
9.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
10.
Pediatric trachyonychia is an acquired nail disease that can cause distress to families. It is a poorly understood disease, and long‐term follow‐up data are lacking. We present an institutional review of 11 children with isolated pediatric trachyonychia followed over time. Children with the diagnosis of pediatric trachyonychia were identified and invited to participate. Pictures were taken on follow‐up and a questionnaire was answered. Exclusion criteria include having another diagnosis at the initial visit that causes nail dystrophy. Eleven patients with the diagnosis of pediatric trachyonychia were available for follow‐up. The mean age of appearance was 2.7 years (range 2–7 yrs) and the average follow‐up was 66 months (range 10–126 mos). Nine patients were treated with potent topical corticosteroids, one used only petrolatum, and one took vitamin supplements. One patient was found to have an additional skin and hair diagnosis of alopecia areata on follow‐up. On follow‐up, 82% noted improvement of the nails, whereas 18% noted no change. A majority of cases of pediatric trachyonychia are isolated and improve with time, regardless of treatment.  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