全文获取类型
收费全文 | 21132篇 |
免费 | 5602篇 |
国内免费 | 127篇 |
专业分类
耳鼻咽喉 | 625篇 |
儿科学 | 626篇 |
妇产科学 | 690篇 |
基础医学 | 283篇 |
口腔科学 | 2643篇 |
临床医学 | 4138篇 |
内科学 | 5040篇 |
皮肤病学 | 454篇 |
神经病学 | 1794篇 |
特种医学 | 980篇 |
外科学 | 3751篇 |
综合类 | 54篇 |
现状与发展 | 12篇 |
预防医学 | 2682篇 |
眼科学 | 329篇 |
药学 | 183篇 |
中国医学 | 6篇 |
肿瘤学 | 2571篇 |
出版年
2024年 | 164篇 |
2023年 | 1089篇 |
2022年 | 354篇 |
2021年 | 630篇 |
2020年 | 1214篇 |
2019年 | 478篇 |
2018年 | 1326篇 |
2017年 | 1285篇 |
2016年 | 1501篇 |
2015年 | 1558篇 |
2014年 | 1954篇 |
2013年 | 2357篇 |
2012年 | 748篇 |
2011年 | 713篇 |
2010年 | 1343篇 |
2009年 | 1934篇 |
2008年 | 721篇 |
2007年 | 475篇 |
2006年 | 627篇 |
2005年 | 439篇 |
2004年 | 308篇 |
2003年 | 276篇 |
2002年 | 240篇 |
2001年 | 375篇 |
2000年 | 270篇 |
1999年 | 375篇 |
1998年 | 498篇 |
1997年 | 480篇 |
1996年 | 531篇 |
1995年 | 386篇 |
1994年 | 299篇 |
1993年 | 259篇 |
1992年 | 172篇 |
1991年 | 152篇 |
1990年 | 135篇 |
1989年 | 140篇 |
1988年 | 122篇 |
1987年 | 121篇 |
1986年 | 98篇 |
1985年 | 92篇 |
1984年 | 75篇 |
1983年 | 89篇 |
1982年 | 82篇 |
1981年 | 67篇 |
1980年 | 45篇 |
1979年 | 32篇 |
1978年 | 32篇 |
1977年 | 43篇 |
1976年 | 31篇 |
1975年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
GLORIA L. KLEIN MS RD KIMBERLY KITA JUDITH FISH MMSc RD BARBARA SINKUS RN GORDON L. JENSEN MD PhD 《Journal of the American Dietetic Association》1997,97(8):885-888
Health care services and resources for older persons living in rural areas may be highly variable, and integrated service-delivery models are often lacking. This article presents a managed-care model of nutrition risk screening and intervention for older persons in rural areas. Nutrition risk screening was implemented by the Geisinger Health Care System, Danville, Pa, to target all eligible enrollees in a regional Medicare risk program. A single remote clinic site participating in the managed health care system was chosen for further study of a linked screening and case-management effort for undernourished persons. Screening and intervention at the clinic site selected for this study were guided by centralized expertise and resources. Individualized evaluation and intervention plans were developed with the aid of a dietitian and implemented by the clinic case manager. Of the 417 subjects who completed screening at the remote site, 68 met the risk criteria for undernutrition and were selected for case management. Many of the targeted persons received interventions that included evaluations by a physician or physician extender (eg, physician assistant, nurse practitioner) at the clinic and consultations with nutrition, mental health, or social services professionals. Twenty-six of the subjects who took part in the intervention completed a follow-up screening 6 months later. Ten of those persons no longer exhibited risk criteria. This demonstrates the feasibility of a linked screening and case management program for nutrition risk in the managed-care setting. J Am Diet Assoc. 1997; 97: 885-888. 相似文献
62.
LARRY A. TUCKER PhD GARY T. SELJAAS MS RONALD L. HAGER MS 《Journal of the American Dietetic Association》1997,97(9):981-986
Objective To ascertain the association between diet composition and body fat percentage in 9- and 10-year-old children. Also, to examine the influence of gender, total energy intake, fitness, physical activity, and parental body mass on the relationship between diet composition and adiposity.Design Diet composition was assessed using the National Cancer Institute food frequency questionnaire, and adiposity was measured using the average of results determined using two skinfold equations. Fitness levels and physical activity were ascertained using the 1-mile run/walk test and a self-report 15-item scale, respectively.Subjects A sample of 262 children (162 boys and 100 girls, mean age=9.8±0.5 years) participated.Statistical analysis Regression analysis was used to determine the extent to which diet composition contributed to adiposity without statistical control for any potentially confounding variables. Partial correlations were calculated to assess the relationship between macronutrient intake and adiposity after potential confounders (gender, total energy intake, physical fitness, and parental body mass) were controlled statistically.Results Energy intake was positively related to adiposity. Fat intake, calculated as a percentage of total energy, was also positively related to adiposity, before and after control for potential confounding variables. Percentage of energy derived from carbohydrate was inversely related to adiposity, before and after controlling for potential confounders.Applications These findings indicate that the macronutrient intake of children, particularly dietary fat and carbohydrate intake, may play a role in adiposity, independent of the influence of total energy intake, gender, physical fitness, and parental body mass index. 相似文献
63.
64.
Influences on the Selection of Dietetics as a Career 总被引:1,自引:0,他引:1
Objective To gather information on the factors that influence students’ decisions to choose dietetics as a career.Design Self-administered questionnaires regarding the point at which career decisions were made were completed by 1,695 students in Plan IV/V dietetics programs throughout the United States.Subjects All Plan IV/V dietetics programs that reported greater than five graduates in the academic year 1989 to 1990 were selected from the 1990-1991 Directory of Dietetic Programs for the sample population. Of the 156 schools that were mailed questionnaires, responses were received from 84 schools (54%). Almost 90% of the students were women, 10.6% were men.Statistical analyses Data were analyzed using the Statistical Package for the Social Sciences. A χ2 analysis was used to examine the relationship between point of decision and factors that influenced career choice, including people who influence career choice.Results The majority of students (55%) questioned reported making their career decision in college. Students rated interest in nutrition (96.3%) and job enjoyment (93.8%) as factors that were important in their decision to pursue a career in dietetics. College catalogs were rated by 48.3% of the students as being either useful or very useful in helping them make their career selection. With respect to gender differences, women rated a diverse work environment as being very important to their career decision more frequently than men (χ2=15.44, P<.01). Women were more likely than men to rate part-time work opportunities as being very important (χ2=26.75, P<.001); and selected working with people as being very important to their career decision (χ2=17.59, P<.01).Conclusions Findings identified that recruitment strategies need to be audience specific. Because career decision making appears to occur during one of three time frames (high school, college, or work experience), recruitment activities should be developed to specifically target students at these times. One way to increase the exposure of students to the profession of dietetics is for registered dietitians to give guest lectures in introductory college courses and high school upper-class courses in health, home economics, and biology. The use of university/college catalogs as effective marketing tools should also not be underestimated.Data suggest that gender differences exist in factors that influence persons to choose dietetics as a career. To increase the number of men who pursue careers in dietetics, future research should be designed to more fully explore gender differences, so that strategies to recruit more men into the profession can be developed. J Am Diet Assoc. 1997: 97;254–257. 相似文献
65.
66.
67.
Shirley L. Jones RNC MS 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1996,25(9):777-783
Advances in human genetics are rapidly changing the scope of information and care that can be provided to health care consumers. By the year 2005 it is expected that the entire human genome will be mapped and all 70,000–100,000 genes will be identified. Currently, there are more than 5,000 known single-gene disorders. With the movement of specialized health services into the primary care setting, nurses increasingly will need to be knowledgeable about genetic disorders, screening/diagnostic tests, and implications for health care. In addition, the management of genetic information raises issues of informed consent, privacy and confidentiality, truth telling and disclosure, and nondiscrimination. 相似文献
68.
69.
Andrew R. Hoellein MD Christopher A. Feddock MD Charles H. Griffith III MD MSPH John F. Wilson PhD Donald R. Barnett MD MSPH Pat F. Bass III MD MS T. Shawn Caudill MD MSPH 《Journal of general internal medicine》2004,19(5P2):562-565
Due to recent public debate and newly imposed resident work hour restrictions, we decided to investigate the relationship of resident call status to their ambulatory patients' satisfaction. Resident continuity clinic patients were asked to rate their level of satisfaction on a 10-point Likert-type scale. Using multiple regression approaches, these data were then assessed as a function of resident call status. We found that in 646 patient encounters, patient satisfaction scores were significantly less when the resident was postcall, 8.99 ± 1.8, than when not postcall, 9.31 ± 1.3. We herein discuss etiologies and implications of these findings for both patient care and medical education. 相似文献
70.