全文获取类型
收费全文 | 2549篇 |
免费 | 264篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 157篇 |
妇产科学 | 24篇 |
基础医学 | 346篇 |
口腔科学 | 132篇 |
临床医学 | 300篇 |
内科学 | 561篇 |
皮肤病学 | 54篇 |
神经病学 | 171篇 |
特种医学 | 294篇 |
外科学 | 262篇 |
综合类 | 33篇 |
一般理论 | 1篇 |
预防医学 | 174篇 |
眼科学 | 40篇 |
药学 | 161篇 |
中国医学 | 4篇 |
肿瘤学 | 126篇 |
出版年
2021年 | 29篇 |
2020年 | 17篇 |
2019年 | 32篇 |
2018年 | 84篇 |
2017年 | 56篇 |
2016年 | 48篇 |
2015年 | 55篇 |
2014年 | 54篇 |
2013年 | 94篇 |
2012年 | 77篇 |
2011年 | 85篇 |
2010年 | 86篇 |
2009年 | 83篇 |
2008年 | 79篇 |
2007年 | 98篇 |
2006年 | 79篇 |
2005年 | 145篇 |
2004年 | 160篇 |
2003年 | 83篇 |
2002年 | 63篇 |
2001年 | 69篇 |
2000年 | 56篇 |
1999年 | 70篇 |
1998年 | 68篇 |
1997年 | 80篇 |
1996年 | 70篇 |
1995年 | 53篇 |
1994年 | 64篇 |
1993年 | 61篇 |
1992年 | 43篇 |
1991年 | 45篇 |
1990年 | 36篇 |
1989年 | 59篇 |
1988年 | 74篇 |
1987年 | 55篇 |
1986年 | 42篇 |
1985年 | 56篇 |
1984年 | 21篇 |
1983年 | 25篇 |
1982年 | 21篇 |
1981年 | 20篇 |
1980年 | 21篇 |
1979年 | 25篇 |
1978年 | 19篇 |
1977年 | 26篇 |
1976年 | 24篇 |
1975年 | 20篇 |
1974年 | 15篇 |
1973年 | 10篇 |
1972年 | 10篇 |
排序方式: 共有2852条查询结果,搜索用时 31 毫秒
1.
2.
3.
Andrew E. Springer Kayan Lewis Steven H. Kelder Maria E. Fernandez Cristina S. Barroso Deanna M. Hoelscher 《Journal of immigrant and minority health / Center for Minority Public Health》2010,12(5):769-780
Research on physical activity (PA) by level of acculturation in Hispanic children is limited and findings have been mixed.
We examined PA participation by primary language used with parents in a representative sample of 4th, 8th, and 11th grade
Texas public school students. Mixed-effects regression models were conducted using cross-sectional data from the 2004–2005
School Physical Activity and Nutrition Study (n = 22,049). Self-reported PA was compared among three language-ethnic groups: Spanish-Hispanic (SH) (referent); English-Hispanic
(EH); and English-Other (EO). EH and/or EO girls were generally between 1.25 and 2.58 [OR] times more likely to participate in PA across grade levels,
with the largest differences found for school sports in 8th grade girls. EH and EO 8th grade boys were 1.71 (CI: 1.40, 2.10)
and 2.06 (CI: 1.68, 2.51) times, respectively, more likely to participate in school sports. Findings indicate important disparities
in Spanish-speaking Hispanic children’s PA participation. 相似文献
4.
5.
M Ardigo I Malizewsky ML Dell'Anna E Berardesca M Picardo 《Journal of the European Academy of Dermatology and Venereology》2007,21(10):1344-1350
BACKGROUND: Vitiligo is the most common pigmentary disorder with a global incidence from 0.1% to 2% in different geographical areas. Histopathology and histochemistry have shown the reduction of melanocytes in achromic patches, but microscopic changes of lesional and non-lesional skin are still not completely understood. Reflectance confocal microscopy (RCM), based on the different light reflectance index of cutaneous structures, allowed in vivo, en face microscopic evaluation of superficial skin layers with a resolution similar to skin histology. AIM: The purpose of this study was to evaluate RCM features of lesional and non-lesional skin of vitiligo patients. Moreover, re-pigmented areas were taken into consideration in order to evaluate melanocyte response to ultraviolet B (UVB) radiation. SUBJECTS AND METHODS: Sixteen patients of different phototypes affected by active non-segmental vitiligo and 10 controls were enrolled in the study. In vivo skin imaging was done using a commercially available RCM (Lucid, Vivascope 1500. Re-pigmented areas from 6 to 16 patients (after UVB narrow-band therapy) were also examined. RESULTS: Vitiligo lesions showed the disappearance of the bright rings normally seen at the dermo-epidermal junction. Moreover, non-lesional skin of vitiligo patients showed unexpected changes as the presence of half-rings or scalloped border-like features of the bright papillary rings. In re-pigmented areas after UVB narrow band therapy, the presence of activated, dendritic melanocytes was seen. CONCLUSIONS: Considering our results, and following further studies, RCM clinical applications could be used in the therapeutic monitoring and evaluation of the evolution of vitiligo. 相似文献
6.
7.
8.
9.
Raw soya-bean flour increases cholecystokinin release in man 总被引:1,自引:0,他引:1
1. The aim of the present study was to determine whether oral ingestion of raw soya-bean flour, which contains trypsin inhibitors, alters the release of cholecystokinin (CCK) in man. 2. Eleven healthy volunteers ate two mixed meals: one with raw soya-bean flour and the other with soya-bean flour that had been heat-treated. The two flours inhibited 34 and 3 mg trypsin/g flour respectively. 3. CCK was measured in plasma using a bioassay based on the release of amylase (EC 3.2.1.1) from dispersed rat pancreatic acini. 4. The peak CCK response was 16.8 (SE 8.1) pmol/l with raw soya-bean flour but 4.9 (SE 2.8) pmol/l with heat-treated flour (P less than 0.05). 5. We conclude that ingestion of raw soya-bean flour increases CCK release in man and that heat treatment which reduces the trypsin inhibitor content of the flour also diminishes its CCK-releasing effect. 相似文献
10.