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   1633826篇
  免费   123553篇
  国内免费   6669篇
耳鼻咽喉   19496篇
儿科学   52780篇
妇产科学   41837篇
基础医学   218339篇
口腔科学   40238篇
临床医学   144269篇
内科学   333227篇
皮肤病学   34022篇
神经病学   137367篇
特种医学   69161篇
外国民族医学   274篇
外科学   259323篇
综合类   35732篇
现状与发展   3篇
一般理论   581篇
预防医学   135122篇
眼科学   33341篇
药学   111832篇
  6篇
中国医学   3007篇
肿瘤学   94091篇
  2018年   37859篇
  2017年   30042篇
  2016年   35262篇
  2015年   17500篇
  2014年   24015篇
  2013年   35503篇
  2012年   50199篇
  2011年   67753篇
  2010年   47303篇
  2009年   39644篇
  2008年   63926篇
  2007年   70124篇
  2006年   47585篇
  2005年   48370篇
  2004年   47914篇
  2003年   48285篇
  2002年   43970篇
  2001年   67462篇
  2000年   69463篇
  1999年   57971篇
  1998年   18320篇
  1997年   16419篇
  1996年   17173篇
  1995年   17314篇
  1994年   16115篇
  1993年   15113篇
  1992年   47800篇
  1991年   46541篇
  1990年   44704篇
  1989年   42478篇
  1988年   39447篇
  1987年   38761篇
  1986年   36526篇
  1985年   35360篇
  1984年   27120篇
  1983年   22907篇
  1982年   14859篇
  1981年   13400篇
  1980年   12633篇
  1979年   24141篇
  1978年   17686篇
  1977年   14916篇
  1976年   13672篇
  1975年   14127篇
  1974年   16517篇
  1973年   15778篇
  1972年   14429篇
  1971年   13291篇
  1970年   12134篇
  1969年   11313篇
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
191.
192.
193.
194.
The special interest group on sensitive skin of the International Forum for the Study of Itch previously defined sensitive skin as a syndrome defined by the occurrence of unpleasant sensations (stinging, burning, pain, pruritus and tingling sensations) in response to stimuli that normally should not provoke such sensations. This additional paper focuses on the pathophysiology and the management of sensitive skin. Sensitive skin is not an immunological disorder but is related to alterations of the skin nervous system. Skin barrier abnormalities are frequently associated, but there is no cause and direct relationship. Further studies are needed to better understand the pathophysiology of sensitive skin – as well as the inducing factors. Avoidance of possible triggering factors and the use of well-tolerated cosmetics, especially those containing inhibitors of unpleasant sensations, might be suggested for patients with sensitive skin. The role of psychosocial factors, such as stress or negative expectations, might be relevant for subgroups of patients. To date, there is no clinical trial supporting the use of topical or systemic drugs in sensitive skin. The published data are not sufficient to reach a consensus on sensitive skin management. In general, patients with sensitive skin require a personalized approach, taking into account various biomedical, neural and psychosocial factors affecting sensitive skin.  相似文献   
195.
196.
197.
198.
199.
200.

Objectives

This study aimed to explore the genetic diversity of Streptococcus pneumoniae isolates in a Tunisian pneumology hospital.

Methods

A total of 141 S. pneumoniae strains isolated between 2009–2016 in the microbiology laboratory at A. Mami Hospital of Pneumology were investigated. Antimicrobial susceptibility testing was performed the disk diffusion method. MICs of penicillin G, amoxicillin and cefotaxime were determined by Etest. Serotyping was inferred from the results of multiplex PCR targeting 40 serotypes. Sequence types (STs) were determined by multilocus sequence typing (MLST).

Results

Among the 141 S. pneumoniae isolates, 98 (69.5%) were resistant to erythromycin. Evaluation of β-lactam susceptibility showed that 90 strains (63.8%) were non-susceptible to penicillin, whereas 48 (34.0%) had decreased susceptibility to amoxicillin and 21 (14.9%) to cefotaxime. Twenty-five serotypes were detected, and 10 isolates were classified as non-typeable. Vaccine coverage was 56.7%, 60.3% and 75.2% for pneumococcal conjugate vaccine 7 (PCV7), PCV10 and PCV13, respectively. Overall, 73 STs were identified, including 23 described for the first time. The most frequent STs were ST179 (n?=?17), ST3772 (n?=?14), ST2918 (n?=?10) and ST4003 (n?=?5), related to serotypes 19F, 19A, 14 and 23F, respectively. Moreover, 110 strains were classified within 45 STs. Three international antimicrobial-resistant clones were found, including Denmark14-ST230 (n?=?22), Spain9V-ST156 (n?=?22) and Portugal19F-ST177 (n?=?20).

Conclusion

This study emphasises the clonal and international dissemination of antimicrobial-resistant S. pneumoniae clones. Significant differences in genetic variation were documented by MLST within the various serotypes identified.  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