全文获取类型
收费全文 | 336488篇 |
免费 | 22380篇 |
国内免费 | 7380篇 |
专业分类
耳鼻咽喉 | 4057篇 |
儿科学 | 9518篇 |
妇产科学 | 6566篇 |
基础医学 | 27417篇 |
口腔科学 | 7923篇 |
临床医学 | 37088篇 |
内科学 | 41974篇 |
皮肤病学 | 4565篇 |
神经病学 | 19471篇 |
特种医学 | 7776篇 |
外国民族医学 | 31篇 |
外科学 | 36122篇 |
综合类 | 50244篇 |
现状与发展 | 12篇 |
一般理论 | 34篇 |
预防医学 | 34255篇 |
眼科学 | 5203篇 |
药学 | 29926篇 |
371篇 | |
中国医学 | 30348篇 |
肿瘤学 | 13347篇 |
出版年
2023年 | 5247篇 |
2022年 | 7951篇 |
2021年 | 13074篇 |
2020年 | 12219篇 |
2019年 | 18103篇 |
2018年 | 15822篇 |
2017年 | 12720篇 |
2016年 | 10219篇 |
2015年 | 9532篇 |
2014年 | 19631篇 |
2013年 | 21297篇 |
2012年 | 18032篇 |
2011年 | 19509篇 |
2010年 | 15666篇 |
2009年 | 14372篇 |
2008年 | 14009篇 |
2007年 | 14488篇 |
2006年 | 12645篇 |
2005年 | 10991篇 |
2004年 | 8944篇 |
2003年 | 7866篇 |
2002年 | 6147篇 |
2001年 | 5543篇 |
2000年 | 4582篇 |
1999年 | 3982篇 |
1998年 | 3220篇 |
1997年 | 3084篇 |
1996年 | 2668篇 |
1995年 | 2567篇 |
1994年 | 2475篇 |
1993年 | 1974篇 |
1992年 | 2005篇 |
1991年 | 1728篇 |
1990年 | 1540篇 |
1989年 | 1370篇 |
1988年 | 1298篇 |
1987年 | 1118篇 |
1985年 | 3783篇 |
1984年 | 4794篇 |
1983年 | 3339篇 |
1982年 | 3800篇 |
1981年 | 3545篇 |
1980年 | 3156篇 |
1979年 | 2904篇 |
1978年 | 2534篇 |
1977年 | 1907篇 |
1976年 | 2149篇 |
1975年 | 1631篇 |
1974年 | 1430篇 |
1973年 | 1277篇 |
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
991.
Gordon Grant Paul Ramcharan Margaret Flynn 《Journal of Applied Research in Intellectual Disabilities》2007,20(6):563-575
Aim This paper seeks to illumine how families with children and adult members with intellectual disabilities manage to manifest a buoyant and durable capacity over time. It is therefore concerned centrally with the idea of resilience. Method Drawing from diverse theoretical literatures from child development and protection and gerontology, the paper begins with a review of constructions of resilience. In an attempt to assess where there seems to be support for resilience in families, the core of the paper tests empirical evidence about positive experiences of families supporting children and adults with intellectual disabilities against the theoretical literature on resilience. Result and Conclusions The findings are used to suggest conditions under which resilience is produced and maintained, and to identify emergent elements of a psycho‐social model of resilience in families with children and adult members with intellectual disabilities. 相似文献
992.
993.
胃幽门弯曲菌感染对胃癌发生影响的探讨 总被引:1,自引:1,他引:0
应用Warthin-starry镀银技术检查胃幽门弯曲菌,对中国胃癌高发区及美国胃癌高发区新奥尔良检查了300例具有胃症状的胃粘膜标本。结果发现幽门弯曲菌阳性率为60~62%,并且看到这种细菌的感染与慢性胃炎病变的程度有明显的关系。本文探讨了幽门弯曲菌的感染与胃癌癌前病变的关系。 相似文献
994.
为探讨临床中使用钙制剂抢救链霉素过敏休克病人有良好效果的原因,由被动血凝试验、被动皮肤过敏试验和ELISA法证实,Ca~( )可以抑制链霉素抗原-抗体的反应。这种抑制作用是通过Ca~( )链霉素抗原结合,封闭链霉素抗原决定簇来加以实现的。 相似文献
995.
We have reviewed some of the factors which contribute to lung damage by various toxicants. These include disposition of the chemical, its metabolism, individual cell type susceptibility and the potential for the tissue to repair. We have discussed the use of biochemical parameters to measure the functional activity of individual cell types in order to predict the damage to specific cell types and concluded that careful morphological analysis of lung tissue is likely to provide a more sensitive and informative measure of specific cell type injury. However, in order to investigate the mechanism of toxicity of pulmonary toxicants it is essential to establish the primary biochemical event that leads to cell damage and morphological change. The importance of separating the relevant biochemical change(s) from the cascade of biochemical events associated with dead and dying cells and the reparative response of the lung is emphasised.This report results from a discussion sponsored and organised by the Advisory Subgroup in Toxicology (AST) of the European Science Foundation's Standing Committee for the European Medical Research Councils and held at the Medical Research Council Toxicology Unit, Carshalton, U. K. Those taking part were: W. N. Aldridge (AST; as above); J. Bignon (Unit for Research in Renal and Pulmonary Pathology, University of Paris, Creteil, France); P. H. Burri (Section of Developmental Biology, Institute of Anatomy, University of Berne, Switzerland); G. M. Cohen (as above); D. Dinsdale (MRC Toxicology Unit, Carshalton U. K.); P. Hedqvist (Dept. of Physiology, Karolinska Institute, Stockholm, Sweden); D. Henschler (AST; Dept. of Toxicology and Pharmacology, University of Wurzburg, FDR); G. J. Laurent (Biochemistry Unit, Cardiothoracic Institute, University of London, London, U. K.); R. Lauwerys (AST Industrial and Medical Toxicology Unit, University of Louvain, Brussels, Belgium); F. Lembeck (AST; Dept. for Experimental and Clinical Pharmacology, University of Graz, Austria); N. Lery (AST; Poison Control Centre, Lyon, France); P. Moldeus (Dept. of Forensic Medicine, Karolinska Institute, Stockholm, Sweden); B. Nemery (MRC Toxicology Unit, Carshalton, U. K.); A. Saria (Dept. for Experimental and Clinical Pharmacology, University of Graz, Austria); L. L. Smith (as above);B. Terracini (AST; Dept. of Pathology and Cancer Epidemiology, University of Turin, Italy) 相似文献
996.
While an exacerbation in allergic symptoms corresponding to seasons has long been reported, few studies have investigated the association between the season of birth and allergic disorders. The aim of this study was to investigate whether the climatologic data before and after birth affected the incidence of atopic dermatitis (AD) and the results of allergy-related blood tests in early infancy. From February 1995 to January 2000, 2136 infants were tested for AD and followed for 12 months. AD patients were tested by using allergy-related blood tests. Data were compared according to the month of birth and the climatologic data using a computed statistical software package. Six hundred and thirty infants had AD before 12 months old, and significant differences were found according to the season of birth (p < 0.0001). Infants born in spring showed the lowest (22.3%) incidence, while those born in autumn showed the highest (34.6%). In 369 patients, total serum IgE levels, and serum specific IgE levels with egg white at 3 months old were also different according to the season of birth. All of these levels were lower in patients born in spring and summer, and higher in patients born in autumn and winter. Furthermore, the cumulative sunshine amount during the 3 months before and after birth was inversely correlated, while the average temperature over the 3 months before birth was positively correlated to the incidence of AD according to the month of birth. The climatologic data around birth may play an important role in whether an infant develops allergies. 相似文献
997.
高效液相色谱法测定复方万年青胶囊中大黄素 总被引:1,自引:0,他引:1
目的建立复方万年青胶囊中大黄素的含量测定方法。方法采用高效液相色谱(HPLC)法,以Diamonsil C18(4.6 mm×250 mm×5μm)为分析柱,甲醇-0.1%磷酸溶液(80∶20)为流动相,流速为1.0 ml/min,柱温为35℃,检测波长254 nm。结果大黄素在0.039~0.355μg范围内呈良好线性关系,r=1.0000。平均回收率为99.3%,RSD=0.4%(n=5)。结论HPLC法是一种简便、准确、可靠的分析方法。 相似文献
998.
999.
目的:探讨加速儿童髋关节一过性滑膜炎疾病的愈合.方法:随机性分析2005年1月~2006年4月共100例髋关节一过性滑膜炎患儿的治疗效果,把病人随机分为治疗组及对照组.治疗组按常规方法治疗加TDP灯局部照射,对照组仅按常规方法治疗.结果:治疗1周后,治疗组B超检查增厚滑膜厚度变化差值、关节腔间隙宽度变化值、关节腔积液好转率、"4"字试验阴性率均明显优于对照组(P<0.05).结论:TDP灯用于治疗儿童髋关节一过性滑膜炎能加速疾病愈合,提高治疗效果. 相似文献
1000.