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   3926篇
  免费   295篇
  国内免费   63篇
耳鼻咽喉   16篇
儿科学   178篇
妇产科学   120篇
基础医学   368篇
口腔科学   77篇
临床医学   433篇
内科学   993篇
皮肤病学   42篇
神经病学   274篇
特种医学   289篇
外国民族医学   1篇
外科学   456篇
综合类   87篇
一般理论   1篇
预防医学   413篇
眼科学   17篇
药学   210篇
中国医学   3篇
肿瘤学   306篇
  2021年   47篇
  2019年   45篇
  2018年   58篇
  2017年   34篇
  2016年   34篇
  2015年   40篇
  2014年   87篇
  2013年   123篇
  2012年   177篇
  2011年   168篇
  2010年   110篇
  2009年   95篇
  2008年   138篇
  2007年   219篇
  2006年   180篇
  2005年   174篇
  2004年   149篇
  2003年   142篇
  2002年   113篇
  2001年   105篇
  2000年   124篇
  1999年   108篇
  1998年   84篇
  1997年   61篇
  1996年   86篇
  1995年   68篇
  1994年   57篇
  1993年   61篇
  1992年   79篇
  1991年   80篇
  1990年   71篇
  1989年   73篇
  1988年   92篇
  1987年   75篇
  1986年   67篇
  1985年   60篇
  1984年   64篇
  1983年   36篇
  1981年   44篇
  1980年   49篇
  1979年   31篇
  1978年   47篇
  1977年   36篇
  1974年   44篇
  1972年   31篇
  1970年   49篇
  1969年   33篇
  1968年   34篇
  1967年   31篇
  1966年   34篇
排序方式: 共有4284条查询结果,搜索用时 15 毫秒
1.
2.
3.
Although there are well-established clinical human milk banks in the United States, there are no milk banks specifically intended to foster research on human milk. The authors' goal was to establish a milk bank with a core data set to support exploratory and hypothesis-driven studies on human milk. Donations to the Cincinnati Children's Research Human Milk Bank are accepted within the context of ongoing, hypothesis-driven research or on an ad hoc basis. Donors must give informed consent, and scientists wishing to use the samples must have Institutional review board approval for their use. Development of more research human milk banks can potentially provide resources for multidisciplinary collaboration and advance the study of human milk and lactation.  相似文献   
4.
5.
R Van  C C Wun  A L Morrow  L K Pickering 《JAMA》1991,265(14):1840-1844
Fecal coliform contamination of environmental surfaces and hands in the day-care center is common. This study evaluated the effect of two diaper types on fecal contamination. Ten rooms in four day-care centers containing 141 children were studied in a prospective, randomized, crossover study. A total of 2946 samples were cultured during the 9-week study. Fecal coliforms were isolated from 307 inanimate objects (15%), 73 toy balls (46%), and 131 hands (17%). The number of contaminated inanimate objects was significantly less in rooms where paper diapers were worn when compared with that in rooms where double cloth diapers with plastic overpants were worn and in rooms where clothes were worn over diapers. Inanimate object cultures had more contamination in rooms in which diarrhea had occurred. Containment of feces by overclothes and diaper type may be important in decreasing transmission of enteric pathogens in day-care environments.  相似文献   
6.
7.
8.
9.
Nineteen patients with ovarian cancer and minimal residual or persistent disease who were treated with cisplatin or carboplatin-based intraperitoneal (IP) regimens had distribution studies of IP contrast and computerized tomography prior to and during treatment. The distribution pattern was assessed retrospectively and scored for the presence of contrast in each of eight regions: the under surface of right and left diaphragms, the right and left paracolic gutters, the lesser omental sac, the intramesenteric region and the true and false pelvis. Assigning a point to each region with adequate distribution, we classified 10 patients to an excellent pattern (greater than or equal to 7 of 8 regions), 6 to a good pattern (5 to less than 7 regions), and 3 to an inadequate distribution pattern (less than 5 regions). Serial studies were performed in 8 patients after more than 4 cycles of IP therapy. In these patients, all of whom were tolerating treatment without progression, the distribution remained virtually unchanged for those with excellent distribution. One of three with good distribution manifested inadequate distribution on repeat study, and one of two with inadequate distribution improved to show a good pattern. In this small study there was no correlation of distribution patterns with plasma CA-125 at onset of IP treatment and prior surgical procedures or placement of the catheter tip. However, three patients with unsatisfactory patterns had procedures consisting of catheter placement only rather than formal reassessment laparotomies for ovarian cancer. Since satisfactory IP distribution may be required for obtaining a therapeutic advantage from IP therapy, methods for its assessment must be developed.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
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