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   60856篇
  免费   3260篇
  国内免费   207篇
耳鼻咽喉   832篇
儿科学   3767篇
妇产科学   1213篇
基础医学   7149篇
口腔科学   1602篇
临床医学   3997篇
内科学   11663篇
皮肤病学   1778篇
神经病学   3703篇
特种医学   1800篇
外科学   8672篇
综合类   1962篇
一般理论   32篇
预防医学   3080篇
眼科学   2605篇
药学   5852篇
中国医学   497篇
肿瘤学   4119篇
  2023年   396篇
  2022年   902篇
  2021年   2302篇
  2020年   1221篇
  2019年   1430篇
  2018年   1962篇
  2017年   1419篇
  2016年   1799篇
  2015年   1788篇
  2014年   2675篇
  2013年   3143篇
  2012年   4369篇
  2011年   4454篇
  2010年   2609篇
  2009年   2078篇
  2008年   3084篇
  2007年   3115篇
  2006年   2997篇
  2005年   2628篇
  2004年   2448篇
  2003年   2063篇
  2002年   1815篇
  2001年   1419篇
  2000年   1360篇
  1999年   1120篇
  1998年   472篇
  1997年   369篇
  1996年   342篇
  1995年   323篇
  1994年   264篇
  1993年   227篇
  1992年   710篇
  1991年   685篇
  1990年   674篇
  1989年   641篇
  1988年   559篇
  1987年   480篇
  1986年   458篇
  1985年   451篇
  1984年   342篇
  1983年   253篇
  1982年   138篇
  1981年   163篇
  1979年   265篇
  1978年   168篇
  1977年   169篇
  1975年   139篇
  1974年   152篇
  1973年   150篇
  1972年   164篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
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   
3.
4.
5.
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   
6.
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   
7.
8.
AimsTo demonstrate a new laparoscopic sign “Sharma's Parachute sign” in abdominopelvic tuberculosis in women with infertility.MethodsA total of 104 women who were diagnosed to have abdominopelvic tuberculosis, on endometrial sampling or on laparoscopy were enrolled in this ongoing study on tuberculosis in infertility. A new laparoscopic “Sharma's parachute sign” was looked for in these cases on laparoscopy.ResultsThe mean age, pairty and duration of infertility was 27.6 years, 0.58 and 4.1 years respectively. Menstrual dysfuction were common especially hypomenorrhoea (34.61%), oligomenorrhoea (36.53%) along with constitutional symptoms and abdomino pelvic pain or lump. Diagnosis of abdominopelvic tuberculosis was made by identification of acid fast bacilli (AFB) on microscopy or culture of endometrial aspirate or peritoneal biopsy or positive gene Xpert or positive polymerase chain reaction (PCR) or histopathological demonstration of epithelioid granuloma on endometrial or peritoneal biopsy, various laparoscopic findings on pelvic and abdominal organs were tubercles and shaggy areas (white deposits, caseous nodules encysted ascites, abdominal and pelvic adhesions, tubal findings (hydrosalpinx, pyosalpinx, beaded or calcified tubes). A new “Sharma's parachute sign”in which ascending colon was totally adherent to anterior abdominal wall with its mesocolon looking like an open parachute with small caseous nodule was seen in 11 (10.5%) cases.ConclusionDiagnostic laparoscopy is an important investigation for abdominopelvic tuberculosis showing various adhesions including new parachute sign.  相似文献   
9.
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