全文获取类型
收费全文 | 340525篇 |
免费 | 22753篇 |
国内免费 | 7589篇 |
专业分类
耳鼻咽喉 | 4096篇 |
儿科学 | 9629篇 |
妇产科学 | 6578篇 |
基础医学 | 27887篇 |
口腔科学 | 7940篇 |
临床医学 | 37279篇 |
内科学 | 42801篇 |
皮肤病学 | 4578篇 |
神经病学 | 19432篇 |
特种医学 | 7879篇 |
外国民族医学 | 31篇 |
外科学 | 36497篇 |
综合类 | 50767篇 |
现状与发展 | 13篇 |
一般理论 | 29篇 |
预防医学 | 35167篇 |
眼科学 | 5269篇 |
药学 | 30192篇 |
372篇 | |
中国医学 | 30826篇 |
肿瘤学 | 13605篇 |
出版年
2023年 | 5469篇 |
2022年 | 9747篇 |
2021年 | 13247篇 |
2020年 | 12375篇 |
2019年 | 18116篇 |
2018年 | 15838篇 |
2017年 | 12741篇 |
2016年 | 10285篇 |
2015年 | 9617篇 |
2014年 | 19705篇 |
2013年 | 21273篇 |
2012年 | 18119篇 |
2011年 | 19631篇 |
2010年 | 15774篇 |
2009年 | 14490篇 |
2008年 | 14096篇 |
2007年 | 14587篇 |
2006年 | 12701篇 |
2005年 | 11049篇 |
2004年 | 9016篇 |
2003年 | 7927篇 |
2002年 | 6212篇 |
2001年 | 5590篇 |
2000年 | 4615篇 |
1999年 | 4029篇 |
1998年 | 3259篇 |
1997年 | 3109篇 |
1996年 | 2702篇 |
1995年 | 2602篇 |
1994年 | 2516篇 |
1993年 | 2003篇 |
1992年 | 2041篇 |
1991年 | 1753篇 |
1990年 | 1571篇 |
1989年 | 1402篇 |
1988年 | 1337篇 |
1987年 | 1141篇 |
1985年 | 3802篇 |
1984年 | 4804篇 |
1983年 | 3350篇 |
1982年 | 3810篇 |
1981年 | 3561篇 |
1980年 | 3164篇 |
1979年 | 2913篇 |
1978年 | 2540篇 |
1977年 | 1913篇 |
1976年 | 2156篇 |
1975年 | 1634篇 |
1974年 | 1432篇 |
1973年 | 1278篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Eichi Itadera Yoshimasa Miyake Yoichi Nakatsuka Hirofumi Akazawa Shigeru Mitani Kiyoshi Aoki 《Journal of orthopaedic science》1996,1(4):252-258
We report satisfactory results with a new operative treatment, conducted via an extensive anterolateral approach, involving
360 degree circumferential capsulotomy, for residual subluxation in congenital dislocation of the hip (CDH). Long-term radiographic
results of this procedure (group A) were compared retrospectively with the results of partial capsulotomy (group B), which
preserved the posteroinferior joint capsule. The mean center edge angle in group A (22.5°) was greater than that in group
B (16.0°). Satisfactory results were achieved in 11 of 15 hips (73%) (Severin class I or II) in group A, and in 5 of 12 hips
(42%) in group B. These results suggest that whole circumferential capsulotomy can remove obstacles to complete reduction,
and that acetabular development can be expected in hips reduced by the procedure, without the performance of innominate osteotomy.
We believe that our technique is a useful alternative for the treatment of residual subluxation in CDH. 相似文献
952.
A. T. McWILLIAMS 《Medical education》1988,22(2):99-103
Medical students are allocated little curriculum time for exposure to expert systems. ESTA, a computer model of an expert system, was developed to make best use of this time. The nature of the students' interaction with ESTA is described, and their reactions to the expert system concepts and the place of expert systems in medicine are presented. A discussion of these reactions draws some conclusions about teaching expert systems in particular, and computers in general, in the basic medical course. 相似文献
953.
D. I. NEWBLE 《Medical education》1988,22(3):200-204
A structured clinical examination has been an integral component of the final-year examinations conducted by the Departments of Medicine and Surgery at the University of Adelaide for the last 8 years. It has been used as an alternative to the traditional clinical examination. This paper describes the results of ongoing student and examiner surveys carried out to determine their views and satisfaction with this new approach. It also briefly discusses the feasibility of introducing such an examination into a conventional medical school environment. The surveys showed a remarkable level of acceptance and support by both students and examiners. This positive reaction has been maintained over the 8-year period. The main reasons seem to be its perceived relevance and fairness. Students also appear to be directing their learning in a direction thought desirable by teachers. No significant problems have been encountered with the practical implementation of the method. 相似文献
954.
200例择期胆囊切除+术中胆道造影患者分二组;芬太尼17ug/kg静注(F组,n=100)、哌替啶1mg/kg静注。评价两种麻醉性镇痛药致Oddi括约肌痉挛的发生率,结果:8例病人造影剂不能通过Oddi括约肌、十二指肠不显影,胆总管下端显示“鸟嘴样”或“假结石”影像,后者3例病人胆总管探查阴性,静注纳络酮0.4mg后,全部病例造影剂顺利进入十二指肠。结论:硬膜外麻醉辅用小剂量芬太尼/哌替啶时Odd 相似文献
955.
芸香甙对大鼠内囊血肿的治疗作用 总被引:2,自引:0,他引:2
芸香甙是黄酮类化合物,就其对大鼠内囊血肿的保护作用进行了初步研究。在内囊血肿大鼠模型上,芸香甙50、100mg.kg^-1可以明显改善大鼠的神经症状,降低神经症状和评分;芸香甙显著降低脑组织的丙二醛含量和提高超氧化物歧化酶的活性。 相似文献
956.
报告5例对胰岛素抵抗的糖尿病特殊类型病例,其均具有胰岛素应用指征,但使用胰岛素后血糖却反而上升,逐渐增加胰岛素用量,则血糖值亦呈上升趋势。对该类病人的治疗,首先停用胰岛素,改用自制中药制剂及优降糖、降糖灵治疗,取得了良好效果。 相似文献
957.
P. V. PEPLOW 《Medical education》1990,24(5):426-432
This paper reports an attempt to develop self-directed learning skills in second-year medical students by introducing case-based projects into the gross anatomy course at a long-established medical school. The programme and students' responses to a questionnaire completed at the end of the year are presented. Information on the various resources used by students to find information is given. The performance of students in the case-based components of the course has been evaluated and also in the more traditional end-of-year written examination. The data confirm that students have recognized that the projects were about obtaining a deeper understanding of the anatomy, and the programme appears to have promoted the use and study of library texts. 相似文献
958.
Polyclonal antibodies recognizing the pyridyloxobutyl (POB) moiety of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) were produced in rabbits immunized either with POB-bovine albumin or POB-Sepharose. The POB intermediates necessary to modify the protein were generated by alkaline (pH 9.0) treatment of the synthetic precursor 4-(carbethoxynitrosamino)-1-(3-pyridyl)-1-butanone. In a competitive enzyme linked immunoabsorbent assay (ELISA), 70 pmole NNK inhibited 50% of the binding of the anti-POB antibodies to POB-protein absorbed on microtiterplates. This 50% inhibition varied from 70 pmole to 200 nmole using a series of NNK analogues, depending on the integrity of the POB moiety. Immunological techniques initiated in this study detect NNK-protein conjugates or measure the quantity of POB groups liberated upon alkaline or acid treatment of NNK modified protein. 相似文献
959.
Julian J. Faraway 《Genetic epidemiology》1993,10(4):225-233
An improved sib-pair test for linkage is introduced which is superior to the previously proposed tests. The test is derived from the standard chi-squared goodness of fit statistic by restricting the alternative hypothesis to the genetically possible. Critical values are given and exact power comparisons are made with the previously proposed tests. The new test is shown to be more powerful for finite samples as well as being asymptotically uniformly most powerful. © 1993 Wiley-Liss, Inc. 相似文献
960.
保定地区1934年首次经血清学证实有EHF病例发生,并从疫区鼠类中查到EHF抗原,其阳性率分别为:褐家鼠4.85%,黑线姬鼠1.95%,大仓鼠0.79%,小家鼠0.51%,褐家鼠可能是我区的主要传染源。疫区健康人群血清EHF抗体阳性率为1.37%,女性显著高于男性。 相似文献