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   61366篇
  免费   3285篇
  国内免费   211篇
耳鼻咽喉   831篇
儿科学   3760篇
妇产科学   1228篇
基础医学   7188篇
口腔科学   1605篇
临床医学   4097篇
内科学   11759篇
皮肤病学   1795篇
神经病学   3729篇
特种医学   1815篇
外国民族医学   1篇
外科学   8667篇
综合类   1970篇
一般理论   32篇
预防医学   3160篇
眼科学   2703篇
药学   5880篇
  1篇
中国医学   504篇
肿瘤学   4137篇
  2023年   400篇
  2022年   1206篇
  2021年   2323篇
  2020年   1234篇
  2019年   1431篇
  2018年   1978篇
  2017年   1432篇
  2016年   1805篇
  2015年   1794篇
  2014年   2686篇
  2013年   3178篇
  2012年   4391篇
  2011年   4473篇
  2010年   2622篇
  2009年   2090篇
  2008年   3093篇
  2007年   3116篇
  2006年   2988篇
  2005年   2644篇
  2004年   2461篇
  2003年   2072篇
  2002年   1818篇
  2001年   1419篇
  2000年   1363篇
  1999年   1123篇
  1998年   477篇
  1997年   369篇
  1996年   342篇
  1995年   321篇
  1994年   264篇
  1993年   225篇
  1992年   711篇
  1991年   683篇
  1990年   676篇
  1989年   638篇
  1988年   558篇
  1987年   480篇
  1986年   459篇
  1985年   452篇
  1984年   341篇
  1983年   251篇
  1982年   138篇
  1981年   162篇
  1979年   264篇
  1978年   168篇
  1977年   168篇
  1975年   138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