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   1337149篇
  免费   114738篇
  国内免费   6364篇
耳鼻咽喉   16717篇
儿科学   43059篇
妇产科学   36585篇
基础医学   183766篇
口腔科学   36282篇
临床医学   120788篇
内科学   278628篇
皮肤病学   31893篇
神经病学   110580篇
特种医学   55594篇
外国民族医学   274篇
外科学   210442篇
综合类   31553篇
现状与发展   2篇
一般理论   415篇
预防医学   106725篇
眼科学   28085篇
药学   93749篇
  5篇
中国医学   2227篇
肿瘤学   70882篇
  2018年   13391篇
  2017年   10643篇
  2016年   12808篇
  2015年   14312篇
  2014年   19965篇
  2013年   29776篇
  2012年   36275篇
  2011年   38941篇
  2010年   24401篇
  2009年   23938篇
  2008年   36407篇
  2007年   38811篇
  2006年   39942篇
  2005年   38520篇
  2004年   36773篇
  2003年   35860篇
  2002年   33869篇
  2001年   66079篇
  2000年   67943篇
  1999年   56613篇
  1998年   16736篇
  1997年   15024篇
  1996年   16015篇
  1995年   16240篇
  1994年   15101篇
  1993年   14158篇
  1992年   47114篇
  1991年   45763篇
  1990年   43989篇
  1989年   41823篇
  1988年   38767篇
  1987年   38085篇
  1986年   35868篇
  1985年   34645篇
  1984年   26360篇
  1983年   22115篇
  1982年   13854篇
  1981年   12451篇
  1980年   11722篇
  1979年   23555篇
  1978年   17076篇
  1977年   14389篇
  1976年   13186篇
  1975年   13729篇
  1974年   16098篇
  1973年   15401篇
  1972年   14183篇
  1971年   13044篇
  1970年   11883篇
  1969年   11104篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
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   
153.
154.
155.
156.
157.

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   
158.
159.
160.
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