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   15065篇
  免费   866篇
  国内免费   84篇
耳鼻咽喉   141篇
儿科学   395篇
妇产科学   293篇
基础医学   1620篇
口腔科学   653篇
临床医学   1209篇
内科学   3335篇
皮肤病学   330篇
神经病学   777篇
特种医学   509篇
外国民族医学   8篇
外科学   2473篇
综合类   599篇
一般理论   12篇
预防医学   1021篇
眼科学   390篇
药学   1282篇
中国医学   82篇
肿瘤学   886篇
  2024年   16篇
  2023年   212篇
  2022年   695篇
  2021年   972篇
  2020年   501篇
  2019年   604篇
  2018年   738篇
  2017年   421篇
  2016年   488篇
  2015年   513篇
  2014年   677篇
  2013年   830篇
  2012年   1163篇
  2011年   1221篇
  2010年   640篇
  2009年   541篇
  2008年   797篇
  2007年   805篇
  2006年   712篇
  2005年   669篇
  2004年   644篇
  2003年   545篇
  2002年   521篇
  2001年   102篇
  2000年   91篇
  1999年   83篇
  1998年   93篇
  1997年   54篇
  1996年   56篇
  1995年   62篇
  1994年   40篇
  1993年   27篇
  1992年   24篇
  1991年   40篇
  1990年   36篇
  1989年   35篇
  1988年   28篇
  1987年   27篇
  1986年   37篇
  1985年   20篇
  1984年   26篇
  1983年   21篇
  1982年   14篇
  1981年   23篇
  1980年   18篇
  1979年   15篇
  1977年   10篇
  1976年   13篇
  1975年   10篇
  1974年   11篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
Robotic reconstruction of the retrocaval ureter is gaining momentum as the method of choice for surgically treating this rare condition. Maintaining the retrocaval ureteric segment further facilitates the procedure. We report a case of a 23-year-old man who underwent intraperitoneal robotic resection anastomosis and repositioning of the retrocaval ureter. We also discuss the advantages of this technique.  相似文献   
93.
94.
The clinical failure of antimicrobial drugs that were previously effective in controlling infectious disease is a tragedy of increasing magnitude that gravely affects human health. This resistance by pathogens is often the endpoint of an evolutionary process that began billions of years ago in non–disease-causing microorganisms. This environmental resistome, its mobilization, and the conditions that facilitate its entry into human pathogens are at the heart of the current public health crisis in antibiotic resistance. Understanding the origins, evolution, and mechanisms of transfer of resistance elements is vital to our ability to adequately address this public health issue.  相似文献   
95.
96.
In 2000, the US Food and Drug Administration approved the da Vinci Surgical System® for use in the United States. Since that time, the number of surgical robotic systems throughout the United States has continued to grow. The costs for using the system include the initial purchase ($1 million to $2.3 million) plus annual maintenance fees ($100,000 to $150,000) and the cost of limited-use or disposable instruments. Increasing the number of procedures that are performed using the robotic system can decrease the per-procedure costs. Two modifiable factors that contribute to increasing the annual caseload are increasing the number of surgeons capable of using the system and having a properly educated perioperative nursing team. An educated surgical team decreases turnover time, facilitates proper flow of each surgical procedure, and is able to actively and passively solve intraoperative problems.  相似文献   
97.
98.
In the present study, 310 faecal samples from goats from eight different farms in Malaysia were tested for the presence of Giardia using a PCR-coupled approach. The nested PCR for SSU amplified products of the expected size (~200 bp) from 21 of 310 (6.8%) samples. Sixteen of these 21 products could be sequenced successfully and represented six distinct sequence types. Phylogenetic analysis of the SSU sequence data using Bayesian Inference (BI) identified Giardia assemblages A, B and E. The identification of the ‘zoonotic’ assemblages A and B suggests that Giardia-infected goats represent a possible reservoir for human giardiasis in Malaysia.  相似文献   
99.
100.
BackgroundCrimes towards children have drawn public attention over the decades. Several studies have been conducted to determine the risk factors of victimizing children. Conducting studies of this crime in Cairo, the capital city of Egypt, would help in understanding the motives behind it in such a densely populated area.Research design and methodologyA review of death charts was conducted in Zeinhom morgue in the years of 2006–2010 to study the trends and characteristics of child homicide in Cairo. The cut-off for a child age was at 18 years. Data related to the victim and offender was collected.ResultsChild homicides represented 7.97% of total child deaths in the studied period. Most of them (25%) fall in the age group of 1–6 years. Females were the majority in the age group of 12–18 years (89%). The offender was the father in 28% of cases and the cause of death was mainly trauma to the head (42%).ConclusionFurther studies should be conducted to discern the risk factors of this crime in Cairo with special considerations to the motives behind murdering females in teen ages.  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