全文获取类型
收费全文 | 254261篇 |
免费 | 21599篇 |
国内免费 | 6023篇 |
专业分类
耳鼻咽喉 | 3659篇 |
儿科学 | 5082篇 |
妇产科学 | 4125篇 |
基础医学 | 20319篇 |
口腔科学 | 8710篇 |
临床医学 | 24990篇 |
内科学 | 30431篇 |
皮肤病学 | 3518篇 |
神经病学 | 12935篇 |
特种医学 | 7651篇 |
外国民族医学 | 11篇 |
外科学 | 23737篇 |
综合类 | 40548篇 |
现状与发展 | 18篇 |
一般理论 | 28篇 |
预防医学 | 32910篇 |
眼科学 | 2868篇 |
药学 | 23354篇 |
373篇 | |
中国医学 | 27135篇 |
肿瘤学 | 9481篇 |
出版年
2024年 | 697篇 |
2023年 | 4848篇 |
2022年 | 8152篇 |
2021年 | 12595篇 |
2020年 | 12002篇 |
2019年 | 13093篇 |
2018年 | 11894篇 |
2017年 | 10183篇 |
2016年 | 9372篇 |
2015年 | 8758篇 |
2014年 | 17432篇 |
2013年 | 17834篇 |
2012年 | 15348篇 |
2011年 | 16532篇 |
2010年 | 13293篇 |
2009年 | 11726篇 |
2008年 | 11049篇 |
2007年 | 11016篇 |
2006年 | 9394篇 |
2005年 | 8070篇 |
2004年 | 6597篇 |
2003年 | 5902篇 |
2002年 | 4586篇 |
2001年 | 3957篇 |
2000年 | 3434篇 |
1999年 | 2764篇 |
1998年 | 2281篇 |
1997年 | 2040篇 |
1996年 | 1613篇 |
1995年 | 1626篇 |
1994年 | 1464篇 |
1993年 | 1224篇 |
1992年 | 1166篇 |
1991年 | 1057篇 |
1990年 | 898篇 |
1989年 | 898篇 |
1988年 | 829篇 |
1987年 | 737篇 |
1986年 | 661篇 |
1985年 | 1934篇 |
1984年 | 2224篇 |
1983年 | 1420篇 |
1982年 | 1828篇 |
1981年 | 1309篇 |
1980年 | 1100篇 |
1979年 | 1022篇 |
1978年 | 827篇 |
1977年 | 634篇 |
1976年 | 770篇 |
1975年 | 550篇 |
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
991.
建立一种新的分离纯化人血浆前白蛋白(PA)的方法。由酚试剂沉淀后的血浆,通过离子交换树脂分离所得PA,用高效液相色谱仪(HPLC)进行纯化,经SDS-聚丙烯酰胺凝胶电泳测定,其分子量在55000左右,纯度达到电泳纯和免疫纯。此法步骤简单,用血量少,适用于实验室常规操作和临床人体研究。 相似文献
992.
993.
O. V. Fidelina O. S. Gorbatyuk I. G. Akmaev 《Bulletin of experimental biology and medicine》1998,125(3):248-250
The activity of nitroxide synthetase (NOS) was studied histochemically and levels of oxytocin and vasopressin immunocytochemically
in rat hypothalamus paraventricular nuclei in on-earth experiments simulating space flight conditions with landing. Colonization
of oxytocin and NOS was found in large-cell neurons of paraventricular nuclei. After 15 days under conditions of simulated
microgravitation followed by 1-day double gravitation and a short-term (1 day) macrogravitation, activities of NOS and content
of neuropeptides increased in large-cell neurons of paraventricular nuclei of experimental animals.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 125, No. 3, pp. 282–284, March, 1998 相似文献
994.
The mistreatment of elderly is subject to various social constructions. On two geographically distinct Plains Indian Reservations which we call Lone Mountain and Abundant Lands, the abuse or neglect of elderly is construed as a health problem which is a dysfunction of the community as a whole. Both physical abuse and neglect are more common on the Lone Mountain Reservation, occurring in association with other indicators of community disorganization such as unemployment and substance abuse. On the Abundant Lands Reservation physical abuse was categorically denied and what neglect existed appeared to be a function of role strain, geographic dispersal, climate and terrain. We attribute differences in the prevalence of mistreatment of elders to variations in economic opportunities for younger residents. Examining the historical and present contexts of intergenerational relationships on the reservations, we discuss the implications of this study for social exchange theory and policy applications.This research was supported by the Gerontological Society of America AppliedThis research was supported by the Gerontological Society of America AppliedThis research was supported by the Gerontological Society of America AppliedThis research was supported by the Gerontological Society of America AppliedThis research was supported by the Gerontological Society of America AppliedThis research was supported by the Gerontological Society of America Applied 相似文献
995.
ART技术封闭恒牙的3年临床效果观察 总被引:4,自引:1,他引:3
目的 :评价非创伤性充填 (ART)技术对恒牙窝沟封闭后 ,封闭剂保留及新生龋病发生情况。方法 :1996年在四川省德阳市 4所中学选取 12~ 13岁儿童 14 0名作 191个ART封闭。采用WHO的ART标准器械 ,德国ESPE公司生产的高强度玻璃离子材料 ,对选择的牙面窝沟进行封闭 ;操作者为经中等口腔专业训练的医生。试验 3年后对ART封闭及牙龋病情况进行评价。结果 :封闭后 1、2、3年的封闭成功率分别为 89.6% ,78.8% ,71.9%。试验后 1年没有新生龋齿的发生 ,试验后 2、3年 ,龋患率较低 ,分别为 1.6% ,2 .8%。结论 :ART封闭试验 3年的保存率较高 ,新生龋发生率低 ;作为恒牙龋病防治的措施是适合和可接受的 ;是一种适合于在学校、社区开展的有效、实用的龋病预防方法。 相似文献
996.
钱文艺 《中华现代医院管理杂志》2007,5(9):26-27
当前部队医院正处于发展转型期,如何引导科技干部适应转型发展新形势,经受住各种考验,始终保持理性平和、协调平衡、积极向上的心理状态,是一个不容忽视的现实问题,也是事关医院内部和谐和医院建设发展又好又快的大事,更是我们思想政治工作者必须着力认真研究、加以解决的重要课题。 相似文献
997.
Lisa Strohschein 《Family relations》2007,56(4):358-368
Abstract: The purpose of this paper is to determine whether divorced parents exhibit a diminished capacity to parent in the period following divorce. Using 2 waves of data from a national survey of Canadian children, the current study prospectively follows 5,004 children living in 2–biological parent households at initial interview and compares changes in parenting practices between households that subsequently divorce and those that remain intact. Results show that divorce is unrelated to changes in parenting behavior, suggesting that there are more similarities than differences in parenting among recently divorced and continuously married parents. 相似文献
998.
目的了解城郊结合部外来人员聚集地生活环境现况和霍乱等肠道传染病健康知信行情况,进一步明确肠道传染病防治健康教育与健康促进工作的重点开展方向。方法采用随机抽样的方法,运用统一设计的调查问卷对嘉兴市5县2区城郊结合部等外来人员聚集地进行流行病学调查。结果93.06%的调查对象以租房为主,90.61%的生活用水来源于自来水,9.25%用井水;78.61%的人知道霍乱传播途径,21.53%的人知道霍乱主要临床症状,28.03%的人知道肠道传染病全部预防措施;77.31%的知识来源于电视,其他顺位依次为书刊、广播、家人或朋友处;希望获得宣传资料形式:传单占46.68%,墙报占31.21%。结论外来人员租房人数居多,有部分人使用井水;肠道传染病相关知识了解的较少。应采取多部门齐抓共管来改善外来人员聚集地的生活环境,因地制宜地对外来人员开展有针对性的预防肠道传染病健康教育。 相似文献
999.
本文报道了子宫内膜活检在诊治不孕症中的作用,并分析了1278例原发性不孕症患者子宫内膜活检后的临床诊断与病理学阳性的关系。其中无排卵性内膜85例占6.2%,黄体功能欠缺50例占3.9%,子宫内膜增生症21例占1.6%,子宫内膜炎8例占0.6%和内膜结核24例占1.8%。文中还对不孕的原因作了进一步的分析与讨论,提出了不孕症的诊治意见。 相似文献
1000.
The Sinding-Larsen and Johansson disease is a non-negligible cause of gonalgia among children of 10 to 14, often misinterpreted as « growing pain . The disease is a benign pathology of the lower pole of the patella which occurs preferentially in physically active children. Our study, carried out in conjunction with the medical department INSEP, is based on a literature review as well as an analysis of 14 cases over two years. The present work eventually led to the differentiation of four etiopathological categories accounting for all the radiochemical evolutions observed. At the origin of these four categories, two factors coexist: the local fragility (the presence of cartilage at the lower pole of the patella) and the trigerring factor, which is most often sports practice. This explains why among children practicing sports, even intensively, only few suffer from this disease.It is essential to know the different radiological aspects of the normal patella in children, in order not to misinterpret one of these aspects with the Sinding-Larsen and Johansson disease.Always benign, the Sinding-Larsen and Johansson disease can very seriously disturb the « careerof children, engaged in high-level sports activity, the average time of evolution being seven months. 相似文献