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   10217篇
  免费   1075篇
  国内免费   11篇
耳鼻咽喉   66篇
儿科学   381篇
妇产科学   300篇
基础医学   928篇
口腔科学   219篇
临床医学   894篇
内科学   2114篇
皮肤病学   158篇
神经病学   894篇
特种医学   438篇
外国民族医学   1篇
外科学   1230篇
综合类   264篇
一般理论   3篇
预防医学   2455篇
眼科学   72篇
药学   384篇
肿瘤学   502篇
  2022年   87篇
  2021年   102篇
  2020年   136篇
  2018年   175篇
  2017年   158篇
  2016年   170篇
  2015年   186篇
  2014年   208篇
  2013年   330篇
  2012年   293篇
  2011年   312篇
  2010年   262篇
  2009年   265篇
  2008年   332篇
  2007年   341篇
  2006年   327篇
  2005年   293篇
  2004年   313篇
  2003年   328篇
  2002年   352篇
  2001年   337篇
  2000年   339篇
  1999年   359篇
  1998年   266篇
  1997年   273篇
  1996年   303篇
  1995年   206篇
  1994年   136篇
  1993年   213篇
  1992年   235篇
  1991年   242篇
  1990年   224篇
  1989年   227篇
  1988年   262篇
  1987年   236篇
  1986年   238篇
  1985年   202篇
  1984年   187篇
  1983年   164篇
  1982年   110篇
  1981年   102篇
  1980年   87篇
  1979年   144篇
  1978年   90篇
  1977年   97篇
  1976年   96篇
  1974年   101篇
  1973年   92篇
  1972年   89篇
  1971年   79篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
Objective To evaluate parents’ fruit and vegetable intake and their use of pressure to eat in child feeding as predictors of their 5-year-old daughters’ fruit and vegetable, micronutrient, and fat intakes.Subjects Data were obtained from 191 non-Hispanic white families with 5-year-old girls.Design Parent data included reports of pressure in child feeding and their own fruit and vegetable intake. Girls’ intakes of fruits and vegetables, selected micronutrients, and fat were the main outcomes of interest.Statistical analysis Structural equation modeling was used to test a model describing relationships among parents’ fruit and vegetable intake, parents’ use of pressure in child feeding, and daughters’ fruit and vegetable, micronutrient, and fat intakes.Results The model provided a good fit to the data, revealing that girls’ fruit and vegetable intake was positively related to their parents’ reported fruit and vegetable intake. Parents who consumed fewer fruits and vegetables tended to report greater pressure in child feeding and had daughters who consumed fewer fruits and vegetables. Girls’ reported fruit and vegetable intakes were positively related to their micronutrient intakes and negatively associated with fat intake.Applications/conclusions This research demonstrates that parents’ own fruit and vegetable intake may encourage fruit and vegetable intake in their daughters, leading to higher micronutrient intakes and lower dietary fat intakes. Conversely, pressure to eat may discourage fruit and vegetable intake among young girls. J Am Diet Assoc. 2002;102:58–64.  相似文献   
44.
45.
46.
47.
48.
49.
Glucose is provided to cells by a family of glucose transport facilitators known as GLUTs. These transporters are expressed in a tissue specific manner and are overexpressed in many primary tumors of these tissues. Regulation of glucose transport facilitator expression has been demonstrated in endometrial tissue and endometrial adenocarcinoma. The following experiments were conducted to quantify and localize the expression of GLUT1 and GLUT8 in benign endometrium and compare this expression to endometrial cancer. Endometrial tissue samples were obtained from random hysterectomy specimens of patients with benign indications for surgery and endometrial cancer. Immunoblot and immunolocatization studies were performed using GLUT1 and GLUT8 specific antisera. Endometrial samples from 65 women who had undergone hysterectomy were examined (n=38 benign, n=27 malignant). A 44 and a 35.4 kDa immunoreacive species was demonstrated in endometrium and endometrial cancer for GLUT1 and GLUT8, respectively. Upregulation of GLUT1 expression was demonstrated with increasing grade of tumors (P<0.002). GLUT8 expression was increased in all tumor subtypes compared to atrophic endometrium (P<0.001). Apical localization by GLUT1 and GLUT8 was demonstrated in endometrial glands. GLUT1 and GLUT8 demonstrated diffuse intracellular localization in the cancer subtypes. GLUT1 and GLUT8 are expressed in both human endometrium and endometrial cancer. There appears to be a step-wise progression in GLUT1 and GLUT8 expression as tumor histopathology worsens. GLUT1 and GLUT8 may be important markers in tumor differentiation, as well as providing energy to rapidly dividing tumor cells.  相似文献   
50.
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