全文获取类型
收费全文 | 2819259篇 |
免费 | 237106篇 |
国内免费 | 15289篇 |
专业分类
耳鼻咽喉 | 38675篇 |
儿科学 | 84526篇 |
妇产科学 | 70708篇 |
基础医学 | 464898篇 |
口腔科学 | 75635篇 |
临床医学 | 247829篇 |
内科学 | 484649篇 |
皮肤病学 | 80244篇 |
神经病学 | 244062篇 |
特种医学 | 110001篇 |
外国民族医学 | 108篇 |
外科学 | 445646篇 |
综合类 | 91054篇 |
现状与发展 | 24篇 |
一般理论 | 2053篇 |
预防医学 | 229582篇 |
眼科学 | 64229篇 |
药学 | 193766篇 |
23篇 | |
中国医学 | 9937篇 |
肿瘤学 | 134005篇 |
出版年
2022年 | 22959篇 |
2021年 | 54781篇 |
2020年 | 34865篇 |
2019年 | 57806篇 |
2018年 | 69602篇 |
2017年 | 52952篇 |
2016年 | 58488篇 |
2015年 | 73431篇 |
2014年 | 107492篇 |
2013年 | 172342篇 |
2012年 | 73860篇 |
2011年 | 70146篇 |
2010年 | 111233篇 |
2009年 | 117364篇 |
2008年 | 57473篇 |
2007年 | 57977篇 |
2006年 | 69701篇 |
2005年 | 64891篇 |
2004年 | 67044篇 |
2003年 | 58543篇 |
2002年 | 48503篇 |
2001年 | 78903篇 |
2000年 | 70485篇 |
1999年 | 75671篇 |
1998年 | 62665篇 |
1997年 | 61045篇 |
1996年 | 58143篇 |
1995年 | 53633篇 |
1994年 | 47710篇 |
1993年 | 44739篇 |
1992年 | 49295篇 |
1991年 | 45836篇 |
1990年 | 42651篇 |
1989年 | 43108篇 |
1988年 | 39845篇 |
1987年 | 38704篇 |
1986年 | 36516篇 |
1985年 | 37248篇 |
1984年 | 36918篇 |
1983年 | 34671篇 |
1982年 | 37552篇 |
1981年 | 35662篇 |
1980年 | 33664篇 |
1979年 | 28026篇 |
1978年 | 27378篇 |
1977年 | 26143篇 |
1976年 | 23234篇 |
1975年 | 21222篇 |
1974年 | 20159篇 |
1973年 | 19205篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
目的 :通过对平阳霉素术前化疗效果的相关因素分析 ,早期判断平阳霉素对口腔鳞癌的效果 ,为确定进一步治疗方案提供指导。方法 :对本院近 3年来接受平阳霉素 (总量为 80mg)化疗的 4 3例口腔癌患者进行直线相关和回归分析 ,观察化疗期间体温改变、发热持续时间、胃肠道反应时间及WBC改变与疗效的关系。结果 :①接受平阳霉素化疗有效的患者多在第 3~ 6天出现局部反应 ;②发热的程度及胃肠道反应与化疗效果密切相关 (P<0 .0 5 )。结论 :化疗早期出现的发热、胃肠道症状及局部反应可以作为早期判断预期疗效的方法。 相似文献
992.
INTRODUCTION: The clinical presentation of morphea varies from localized plaques to generalized eruptions. Its cause remains unknown and medical treatments have often proved unsatisfactory. Studies have previously shown that improvement of hypertrophic scars and fibrotic skin can be achieved with the use of a 585 nm pulsed dye laser (PDL). METHODS: A case of plaque-type morphea was treated with 585 nm pulsed dye laser irradiation at an average fluence of 5.0 J/cm2 at bimonthly time intervals. RESULTS: Marked clinical improvement as evidenced by improved pliability and skin coloration was seen after 4 successive PDL treatments. No side effects or complications were encountered. CONCLUSION: Pulsed dye laser therapy is a viable treatment option for morphea. The mechanism of its effect in this condition remains unknown. 相似文献
993.
994.
995.
996.
997.
目的:观察离体心脏左心室三层心肌的单相动作电位的改变,以探讨扩张型心肌病易发心室颤动与三层心肌跨室壁复极不均一性的关系。方法:用阿霉素制作扩张型心肌病家兔模型,测定其室颤阈值(VFT)以及心外膜、中层心肌和心内膜心肌细胞的单相动作电位复极90%时程(APD90)、跨室壁复极离散度(TDR)。结果:扩张型心肌病VFT明显降低(P<0.001),三层心肌细胞APD90均明显延长(P<0.001),中层心肌细胞较心外膜、心内膜下心肌细胞延长更为显著(P<0.05);扩张型心肌病跨室壁复极离散度增加(P<0.01)。结论:中层心肌细胞APD90明显延长、跨室壁复极离散度增加、三层心肌复极不均一性增加可能是扩张型心肌病容易发生心室颤动的重要原因。 相似文献
998.
999.
Iron Fortification of Flours in Venezuela 总被引:1,自引:0,他引:1
This paper reviews a conference about the impact of the iron fortification program in Venezuela; it was presented at the Pan American Health Organization regional technical meeting: "Iron Fortification: Where Are We in Terms of Iron Compounds," held in Washington January 10–12, 2001. Some of the data presented were published in the American Journal of Clinical Nutrition , including stimulating results about the impact of fortification of precooked corn and white wheat flours, as well as the prevalence of anemia and iron deficiency in the Venezuelan population. This article reports results from three surveys carried out in 1997, 1998, and 1999 on the same age and socioeconomic group that had been evaluated in 1990, 1992, and 1994. This article also shows the impact of iron fortification programs and the influence of other factors on the prevalence of iron deficiency and anemia during the last 7 years. 相似文献
1000.
W. S. L. Stebbings M. J. G. Farthing J. R. Puddefoot Elizabeth Anderson G. P. Vinson J. M. A. Northover R. F. M. Wood 《Journal of cancer research and clinical oncology》1988,114(2):208-211
Summary To evaluate the potential effect of androgens on the development and growth of human colorectal adenomas, the prevalence and concentration of cytosolic androgen receptors (AR) were analysed in 26 adenomas and 19 samples of normal colonic mucosa by a hybrid ligand receptor-binding assay. AR were detected in 7 of the adenomas (26.9%), and in 6 of the normal mucosa samples (31.6%). In the adenomas, AR levels demonstrated were low, ranging from 6 to 31 fmol/mg cytosol protein, and dissociation constants (Kds) ranged from 0.17–2.7x10-9
M. Of 13 adenomas excised from men, 6 (46%) had positive receptor activity, whereas only 1 of 13 (7.7%) from women was positive (P=0.03, Fisher's exact test). There was no correlation between AR titre and patient age, or between adenoma size and histological type or degree of dysplasia. In normal mucosa, AR levels ranged from 7 to 33 fmol/mg and Kds ranges from 0.24–3.1x10-9
M. There was no significant difference between either AR prevalence or levels in the adenomas and normal mucosa. The sex difference was exclusive to the adenoma. Endogenous androgen may play a role in adenoma development early in the promotional process. 相似文献