全文获取类型
收费全文 | 1303篇 |
免费 | 70篇 |
国内免费 | 60篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 89篇 |
妇产科学 | 40篇 |
基础医学 | 131篇 |
口腔科学 | 35篇 |
临床医学 | 168篇 |
内科学 | 308篇 |
皮肤病学 | 47篇 |
神经病学 | 48篇 |
特种医学 | 101篇 |
外科学 | 104篇 |
综合类 | 63篇 |
一般理论 | 1篇 |
预防医学 | 124篇 |
眼科学 | 17篇 |
药学 | 99篇 |
中国医学 | 2篇 |
肿瘤学 | 48篇 |
出版年
2019年 | 9篇 |
2018年 | 11篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 26篇 |
2013年 | 37篇 |
2012年 | 12篇 |
2011年 | 20篇 |
2010年 | 41篇 |
2009年 | 36篇 |
2008年 | 32篇 |
2007年 | 52篇 |
2006年 | 18篇 |
2005年 | 19篇 |
2004年 | 11篇 |
2002年 | 11篇 |
2001年 | 16篇 |
1999年 | 20篇 |
1998年 | 52篇 |
1997年 | 55篇 |
1996年 | 53篇 |
1995年 | 50篇 |
1994年 | 47篇 |
1993年 | 34篇 |
1992年 | 24篇 |
1991年 | 27篇 |
1990年 | 11篇 |
1989年 | 29篇 |
1988年 | 31篇 |
1987年 | 24篇 |
1986年 | 12篇 |
1985年 | 26篇 |
1984年 | 24篇 |
1983年 | 19篇 |
1982年 | 23篇 |
1981年 | 19篇 |
1980年 | 16篇 |
1979年 | 8篇 |
1978年 | 12篇 |
1977年 | 12篇 |
1976年 | 14篇 |
1975年 | 12篇 |
1959年 | 36篇 |
1958年 | 44篇 |
1957年 | 55篇 |
1956年 | 50篇 |
1955年 | 50篇 |
1954年 | 51篇 |
1949年 | 16篇 |
1948年 | 20篇 |
排序方式: 共有1433条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
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
5.
Balloon dacryocystoplasty: indications and contraindications 总被引:3,自引:0,他引:3
6.
7.
Deaths from sudden infant death syndrome (SIDS) between 1979 and 1984 were tabulated by month for weekdays, weekends and public holidays. Examination of deaths by day of the week showed the weekend had more deaths than the weekdays (χ2 = 26.3, df = 6, p = 0.0002) and that this pattern occurred in both the under three months and three-11 months age group. There were 40 deaths on the 78 public holidays in the six years under study. Modelling the data showed that there was no difference between the number of deaths on holidays compared to weekends. 相似文献
8.
9.
10.
Bleeding tendency in factor (F)XI deficiency may result from premature clot lysis due to insufficient thrombin activatable fibrinolysis inhibitor (TAFI) activation. Thrombomodulin (TM), upon binding to thrombin, is capable of modulating TAFI activation. In this study, we investigated the effects of plasma TM on fibrinolysis in FXI-deficient patients. A clot lysis assay showed the defective down-regulation of fibrinolysis in FXI-deficient patients as compared with normal controls. To evaluate the effects of plasma TM on fibrinolysis, a monoclonal anti-TM IgG was preincubated with plasma for 30 min. The presence of anti-TM IgG significantly prolonged the clot lysis times both in the FXI-deficient and normal plasma, indicating that plasma TM stimulated fibrinolysis. Furthermore, the presence of anti-TM IgG not only reduced protein C activation, but also increased thrombin generation and TAFI activation. The profibrinolytic effect of plasma TM was inhibited in the assay by including either a monoclonal anti-TAFI IgG or a specific TAFI inhibitor--carboxypeptidase inhibitor (CPI). Our results indicate that the impaired thrombin generation in FXI-deficient patients leads to the defective down-regulation of fibrinolysis, and that plasma TM stimulates fibrinolysis through APC pathway which inhibits TAFI activation. The profibrinolytic effect of plasma TM may contribute to the bleeding tendency observed in some FXI-deficient patients. 相似文献