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   94295篇
  免费   30042篇
  国内免费   1060篇
耳鼻咽喉   2371篇
儿科学   2527篇
妇产科学   2269篇
基础医学   2132篇
口腔科学   5011篇
临床医学   25875篇
内科学   24001篇
皮肤病学   3226篇
神经病学   11916篇
特种医学   3475篇
外科学   17424篇
综合类   114篇
现状与发展   40篇
一般理论   1篇
预防医学   13321篇
眼科学   2093篇
药学   955篇
中国医学   7篇
肿瘤学   8639篇
  2024年   739篇
  2023年   5016篇
  2022年   1076篇
  2021年   2662篇
  2020年   5280篇
  2019年   1955篇
  2018年   6791篇
  2017年   7257篇
  2016年   7840篇
  2015年   7909篇
  2014年   10282篇
  2013年   11981篇
  2012年   3520篇
  2011年   3278篇
  2010年   6682篇
  2009年   8981篇
  2008年   3299篇
  2007年   2245篇
  2006年   3402篇
  2005年   1960篇
  2004年   1362篇
  2003年   1059篇
  2002年   975篇
  2001年   1791篇
  2000年   1119篇
  1999年   1651篇
  1998年   2055篇
  1997年   1903篇
  1996年   1942篇
  1995年   1681篇
  1994年   1069篇
  1993年   905篇
  1992年   731篇
  1991年   624篇
  1990年   500篇
  1989年   509篇
  1988年   493篇
  1987年   370篇
  1986年   346篇
  1985年   289篇
  1984年   248篇
  1983年   297篇
  1982年   222篇
  1981年   197篇
  1980年   118篇
  1978年   121篇
  1977年   115篇
  1976年   85篇
  1974年   71篇
  1972年   72篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
962.
963.
964.
965.
966.
Objective To determine change in nutrient intakes, number of servings, and contributions of total fat from food groups in children who lowered their dietary fat intake.Design A research and demonstration study designed to lower plasma low-density lipoprotein cholesterol level. There were four study groups: two intervention and two control groups. All children had hypercholesterolemia except for those in one control group. Three 24-hour dietary recalls were collected on randomly assigned days over a 2-week period at baseline and 3 months after the intervention.Subjects Three hundred three 4- to 10-year old children from suburbs north of Philadelphia, Pa.Interventions One intervention involved a home-based, parent-child autotutorial program (PCAT group) with audiotaped stories and print materials for the children and their families; the other intervention involved one face-to-face counseling session with a registered dietitian (counseling group).Outcome measures Change in mean nutrient intakes compared with the Recommended Dietary Allowance (RDA); change in number of servings and mean grams of total fat contributed from 10 different food groups.Statistical analyses performed Analyses of variance and χ2 analyses.Results Children in every study group had mean intakes of all nutrients (except vitamin D) greater than 67% of the RDA 3 months after the baseline measurement. Several food groups (ie, meats, dairy products, fats/oils, and desserts) provided less total fat to the diets of children who reduced their dietary lipid intake after 3 months (ie, PCAT and counseling groups). These children also reduced the mean number of servings selected from these food groups. Within these same food groups, some children consumed fewer servings of higher fat foods and more servings of lower fat foods.Applications/conclusions Children who lowered their dietary fat intake after intervention reported both quantitative and qualitative changes in food choices from several food groups. These choices did not significantly reduce their nutrient intakes. J Am Diet Assoc. 1996; 96:865-873.  相似文献   
967.
In no known culture in the world is childbearing treated with indifference. Cultural beliefs about and values associated with childbearing touch all aspects of social life in any given culture. Such beliefs and values lend perspective to the meaning of childbirth to the childbearing woman. Having the opportunity to share the woman's perceptions of the meaning of childbearing may foster the self-actualization, promote maternal role attainment, and improve her relationship with her significant other and enrich the family perspective. Nursing interventions across the childbearing year should be culturally sensitive to promote positive outcomes for the woman and her family.  相似文献   
968.
In this review of the scientific literature on the relationship between vegetable and fruit consumption and risk of cancer, results from 206 human epidemiologic studies and 22 animal studies are summarized. The evidence for a protective effect of greater vegetable and fruit consumption is consistent for cancers of the stomach, esophagus, lung, oral cavity and pharynx, endometrium, pancreas, and colon. The types of vegetables or fruit that most often appear to be protective against cancer are raw vegetables, followed by allium vegetables, carrots, green vegetables, cruciferous vegetables, and tomatoes. Substances present in vegetables and fruit that may help protect against cancer, and their mechanisms, are also briefly reviewed; these include dithiolthiones, isothiocyanates, indole-3-carbinol, allium compounds, isoflavones, protease inhibitors, saponins, phytosterols, inositol hexaphosphate, vitamin C, D-limonene, lutein, folic acid, beta carotene, lycopene, selenium, vitamin E, flavonoids, and dietary fiber. Current US vegetable and fruit intake, which averages about 3.4 servings per day, is discussed, as are possible noncancer-related effects of increased vegetable and fruit consumption, including benefits against cardiovascular disease, diabetes, stroke, obesity, diverticulosis, and cataracts. Suggestions for dietitians to use in counseling persons toward increasing vegetable and fruit intake are presented. J Am Diet Assoc. 1996; 96:1027-1039.  相似文献   
969.
Interdisciplinary collaboration between nursing and medicine is a valued goal, but one which is difficult to achieve. Two nurses who are faculty members in medical schools reflect on their unique roles and how these encompass interdisciplinary research, teaching, and practice.  相似文献   
970.
Patient-centred evaluation and rehabilitative care   总被引:1,自引:0,他引:1  
The evaluation of health care outcomes is becoming increasingly important in today's health service The wide range of measures used to evaluate these outcomes often makes clinical audit difficult and the comparison of research papers almost impossible In this paper we will discuss some of the issues surrounding outcome measurement in rehabilitative care, examine one of the most commonly used outcome measures from this area (the Barthel Index) and consider Goal Attainment Scaling, a technique which offers both clinicians and researchers the opportunity to evaluate health care outcomes on the basis of patient-centred practice We have identified certain methodological problems that need to be addressed if Goal Attainment Scaling is to become an acceptable measure in the area of physical rehabilitative care  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