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   64994篇
  免费   3547篇
  国内免费   206篇
耳鼻咽喉   876篇
儿科学   4470篇
妇产科学   1285篇
基础医学   7624篇
口腔科学   1694篇
临床医学   4112篇
内科学   11897篇
皮肤病学   2105篇
神经病学   3644篇
特种医学   2056篇
外科学   9806篇
综合类   2119篇
一般理论   27篇
预防医学   3238篇
眼科学   2665篇
药学   6063篇
中国医学   479篇
肿瘤学   4587篇
  2023年   400篇
  2022年   448篇
  2021年   2211篇
  2020年   1269篇
  2019年   1476篇
  2018年   2043篇
  2017年   1463篇
  2016年   1950篇
  2015年   1956篇
  2014年   2860篇
  2013年   3346篇
  2012年   4762篇
  2011年   4801篇
  2010年   2747篇
  2009年   2194篇
  2008年   3317篇
  2007年   3428篇
  2006年   3047篇
  2005年   2821篇
  2004年   2595篇
  2003年   2269篇
  2002年   1982篇
  2001年   1466篇
  2000年   1345篇
  1999年   1180篇
  1998年   524篇
  1997年   395篇
  1996年   355篇
  1995年   327篇
  1994年   268篇
  1993年   264篇
  1992年   692篇
  1991年   713篇
  1990年   691篇
  1989年   675篇
  1988年   579篇
  1987年   515篇
  1986年   494篇
  1985年   503篇
  1984年   387篇
  1983年   300篇
  1982年   185篇
  1979年   346篇
  1978年   231篇
  1977年   234篇
  1976年   199篇
  1975年   219篇
  1974年   204篇
  1973年   236篇
  1972年   184篇
排序方式: 共有10000条查询结果,搜索用时 9 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.
5.
Microbial co-infections are another primary concern in patients with coronavirus disease 2019 (COVID-19), yet it is an untouched area among researchers. Preliminary data and systematic reviews only show the type of pathogens responsible for that, but its pathophysiology is still unknown. Studies show that these microbial co-infections are hospital-acquired/nosocomial infections, and patients admitted to intensive care units with invasive mechanical ventilation are highly susceptible to it. Patients with COVID-19 had elevated inflammatory cytokines and a weakened cell-mediated immune response, with lower CD4+ T and CD8+ T cell counts, indicating vulnerability to various co-infections. Despite this, there are only a few studies that recommend the management of co-infections.  相似文献   
6.
7.
8.
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   
9.
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   
10.
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