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   5491篇
  免费   203篇
  国内免费   46篇
儿科学   50篇
妇产科学   6篇
基础医学   148篇
口腔科学   16篇
临床医学   414篇
内科学   473篇
皮肤病学   18篇
神经病学   9篇
特种医学   33篇
外科学   37篇
综合类   498篇
预防医学   3602篇
眼科学   4篇
药学   355篇
中国医学   34篇
肿瘤学   43篇
  2023年   4篇
  2022年   25篇
  2021年   17篇
  2020年   25篇
  2019年   18篇
  2018年   6篇
  2017年   2篇
  2016年   3篇
  2015年   9篇
  2014年   13篇
  2013年   32篇
  2012年   144篇
  2011年   952篇
  2010年   389篇
  2009年   181篇
  2008年   332篇
  2007年   290篇
  2006年   309篇
  2005年   315篇
  2004年   675篇
  2003年   651篇
  2002年   432篇
  2001年   229篇
  2000年   216篇
  1999年   141篇
  1998年   25篇
  1997年   45篇
  1996年   34篇
  1995年   32篇
  1994年   41篇
  1993年   31篇
  1992年   23篇
  1991年   24篇
  1990年   27篇
  1989年   11篇
  1988年   4篇
  1987年   15篇
  1986年   1篇
  1985年   2篇
  1984年   1篇
  1983年   2篇
  1982年   4篇
  1980年   4篇
  1979年   1篇
  1978年   1篇
  1970年   1篇
  1965年   1篇
排序方式: 共有5740条查询结果,搜索用时 15 毫秒
991.
On July 6, 2009, the Organ Procurement and Transplantation Network received notification of possible disease transmission. A transplant center in California (TCA) reported a kidney transplant recipient with Escherichia coli urinary tract infection and sepsis suspected to have been contracted from the donated kidney. Upon further investigation, a transplant center in Texas (TCB) reported that the recipient of the other kidney from the same donor developed a perinephric abscess caused by E. coli. The kidney grafts failed in both recipients; however, both recipients survived. E. coli isolates from both recipients demonstrated similar antimicrobial susceptibility profiles. Molecular typing studies conducted at CDC showed that the E. coli isolates from both kidney recipients were identical to an isolate from the donor's urine. On October 30, 2009, the Texas Department of State Health Services requested assistance from CDC to investigate this transplant-associated E. coli transmission and make recommendations to prevent future transmissions. The investigation identified gaps in communicating important donor information that might have adversely affected transplant outcomes. Each organ procurement organization (OPO) should establish protocols that clearly assign responsibilities for receiving, reviewing, and conveying any relevant donor information that becomes available subsequent to organ procurement.  相似文献   
992.
993.
994.
目的了解基层疾病预防控制中心(CDC)疾病监测工作人员能力和需求,为提高疾病监测能力提供建议。方法采用自填式问卷定量调查浙江省各级CDC所有传染病网络直报数据监测管理人员和疾病防制人员共484人,收回有效问卷484份。将调查结果用EpiData 3.0输入并导出数据建立SPSS数据库进行统计分析。结果基层CDC中,47.52%(230/484)的传染病网络直报相关人员学习过统计软件的使用方法,85.95%(416/484)的人员能使用Excel对数据进行整理和分析,使用较多的软件为EpiData,而SAS、Stata软件的使用率较低。81.40%(394/484)的人认为最迫切需要培训的内容是数据分析和利用的方法。结论目前浙江省基层CDC传染病网络直报工作相关人员对统计学知识的掌握尚不够全面,对多种统计学软件的应用能力欠缺,需要针对性地加强培训。  相似文献   
995.
996.
997.
INTRODUCTION With the rapid development of genetically modified foods in the world, the safety assessment of these novel foods is becoming the first task for governments, scientists, and consumers. At the same time, nutritional assessment is an important …  相似文献   
998.
999.
Guidelines for infection control in dental health care settings--2003   总被引:4,自引:0,他引:4  
BACKGROUND: The Centers for Disease Control and Prevention, or CDC, is the lead federal agency for disease prevention in the United States. It has been 10 years since CDC infection control guidelines for dental health care settings were last published. During those 10 years, new technologies and issues have emerged, and other CDC infection control guidelines for health care settings have been updated. RESULTS: In light of these developments, CDC collaborated with experts in infection control to revise its infection control recommendations for dental health care settings. Existing guidelines and published research pertinent to dental infection control principles and practices were reviewed. This article provides background information, describes the process used to create these guidelines, and lists the new recommendations. CLINICAL IMPLICATIONS: CDC believes that dental offices that follow these new recommendations will strengthen an already admirable record of safe dental practice. Patients and providers alike can be assured that oral health care can be delivered and received in a safe manner.  相似文献   
1000.
In 1996, the Centers for Disease Control and Prevention (CDC) and relevant professional organizations jointly released guidelines for prevention of early-onset neonatal group B streptococcal infections. The guidelines recommended that all obstetric providers and institutions providing intrapartum services follow one of two strategies. This year, on the basis of multistate surveillance data collected since prevention strategies were initiated, the CDC has released revised prevention recommendations. This article reviews the new guidelines and discusses clinical implications for practice in a variety of settings.  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