全文获取类型
收费全文 | 3323篇 |
免费 | 439篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 114篇 |
妇产科学 | 43篇 |
基础医学 | 182篇 |
口腔科学 | 68篇 |
临床医学 | 274篇 |
内科学 | 441篇 |
皮肤病学 | 19篇 |
神经病学 | 69篇 |
特种医学 | 168篇 |
外科学 | 186篇 |
综合类 | 19篇 |
一般理论 | 1篇 |
预防医学 | 1934篇 |
眼科学 | 18篇 |
药学 | 121篇 |
肿瘤学 | 102篇 |
出版年
2023年 | 31篇 |
2022年 | 51篇 |
2021年 | 32篇 |
2020年 | 95篇 |
2019年 | 31篇 |
2018年 | 105篇 |
2017年 | 108篇 |
2016年 | 107篇 |
2015年 | 99篇 |
2014年 | 98篇 |
2013年 | 192篇 |
2012年 | 66篇 |
2011年 | 61篇 |
2010年 | 134篇 |
2009年 | 137篇 |
2008年 | 68篇 |
2007年 | 73篇 |
2006年 | 109篇 |
2005年 | 74篇 |
2004年 | 74篇 |
2003年 | 54篇 |
2002年 | 108篇 |
2001年 | 113篇 |
2000年 | 88篇 |
1999年 | 159篇 |
1998年 | 164篇 |
1997年 | 199篇 |
1996年 | 212篇 |
1995年 | 134篇 |
1994年 | 62篇 |
1993年 | 130篇 |
1992年 | 43篇 |
1991年 | 36篇 |
1990年 | 28篇 |
1989年 | 51篇 |
1988年 | 48篇 |
1987年 | 36篇 |
1986年 | 49篇 |
1985年 | 33篇 |
1984年 | 30篇 |
1983年 | 24篇 |
1982年 | 25篇 |
1981年 | 22篇 |
1980年 | 14篇 |
1979年 | 17篇 |
1978年 | 13篇 |
1977年 | 14篇 |
1976年 | 24篇 |
1975年 | 12篇 |
1971年 | 10篇 |
排序方式: 共有3766条查询结果,搜索用时 62 毫秒
41.
JENNIFER ORLET FISHER PhD DIANE C. MITCHELL MS RD HELEN SMICIKLAS- WRIGHT PhD LEANN LIPPS BIRCH PhD 《Journal of the American Dietetic Association》2002,102(1)
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
42.
43.
44.
45.
46.
47.
48.
49.
50.
LAUREL MELLIN MA RD MARY CROUGHAN-MINIHANE PhD LARRY DICKEY MD MSW MPH 《Journal of the American Dietetic Association》1997,97(10):1133-1138
This study describes changes observed during a 2-year period in participants enrolled in The Solution Method, a developmental skills training program for adult weight management. This Intervention is the adult application of a model of treatment previously used only in the management of pediatric obesity (The Shapedown Program). Developmental skills training integrates understandings and methods from developmental, family systems, biomedical, genetic, and behavioral theories of the etiology of obesity. Twenty-two subjects (mean age=43.4±8.5 years and mean body mass index=33.1+5.3) completed a group intervention based on this method, which was conducted by a registered dietitian and a mental health professional. Questionnaire responses indicated the extent to which their weight was a medical and/ or psychosocial risk. Subjects attended 2-hour weekly sessions for an average of 18 weeks during which they were trained in six developmental skills: strong nurturing, effective limits, body pride, good health, balanced eating, and mastery living. Data, which were collected at the beginning of treatment and at 3, 6, 12, and 24 months, included weight, blood pressure, 7-day exercise recalls, and responses to depression and functioning (psychosocial, vocational, and economic) questionnaires. Participants’ weights decreased throughout the 2-year period of the study: mean weight change was −4.2 kg (3 months), −6.0 kg (6 months), −7.0 kg (12 months), and −7.9 kg (24 months). In addition, compared with baseline values, systolic and diastolic blood pressure, exercise, and depression improved throughout the study period. These improvements were statistically significant at 24 months for weight (p<.01), systolic blood pressure (p<.02), diastolic blood pressure (p<.001), and exercise (p<.001); the results were not statistically significant for depression. Most participants reported improvement in a broad range of aspects of functioning. We conclude that this application of developmental skills training for adult weight management may produce significant long-term beneficial effects. J Am Diet Assoc. 1997;97:1133–1138. 相似文献