全文获取类型
收费全文 | 904篇 |
免费 | 59篇 |
国内免费 | 75篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 8篇 |
妇产科学 | 5篇 |
基础医学 | 75篇 |
口腔科学 | 102篇 |
临床医学 | 243篇 |
内科学 | 133篇 |
皮肤病学 | 38篇 |
神经病学 | 15篇 |
特种医学 | 95篇 |
外国民族医学 | 1篇 |
外科学 | 85篇 |
综合类 | 80篇 |
预防医学 | 14篇 |
眼科学 | 1篇 |
药学 | 87篇 |
中国医学 | 1篇 |
肿瘤学 | 40篇 |
出版年
2022年 | 5篇 |
2021年 | 11篇 |
2020年 | 10篇 |
2019年 | 14篇 |
2018年 | 16篇 |
2017年 | 8篇 |
2016年 | 15篇 |
2015年 | 12篇 |
2014年 | 17篇 |
2013年 | 35篇 |
2012年 | 33篇 |
2011年 | 30篇 |
2010年 | 47篇 |
2009年 | 47篇 |
2008年 | 56篇 |
2007年 | 104篇 |
2006年 | 65篇 |
2005年 | 55篇 |
2004年 | 48篇 |
2003年 | 38篇 |
2002年 | 22篇 |
2001年 | 21篇 |
2000年 | 26篇 |
1999年 | 23篇 |
1998年 | 27篇 |
1997年 | 24篇 |
1996年 | 28篇 |
1995年 | 19篇 |
1994年 | 16篇 |
1993年 | 22篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 13篇 |
1988年 | 4篇 |
1987年 | 13篇 |
1986年 | 9篇 |
1985年 | 15篇 |
1984年 | 3篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 7篇 |
1964年 | 3篇 |
1958年 | 2篇 |
1957年 | 3篇 |
排序方式: 共有1038条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
Background: The fabrication of dental prosthesis requires the transfer of interocclusal records from patient's mouth to semiadjustable articulators using different kinds of recording media. Any inaccuracy in these interocclusal records leads to occlusal errors in the final prosthesis. This study was conducted to evaluate the dimensional changes occurring in the interocclusal recording material over a given period of time and the material's resistance to compression during the cast mounting on the articulator. 相似文献
5.
6.
Adorján F. Kovács Waleed Megahed Michael Scholz Robert Sader 《Mund-, Kiefer- und Gesichtschirurgie》2007,11(5):267-283
PURPOSE: The development of overall survival of a DOSAK (German-Austrian-Swiss Cooperative Group on tumours of the maxillofacial region) clinic's overall population comprising a time period of more than 20 years (1983-2004) should be assessed. At a cutoff date (January 1st, 1997), a change from a primarily surgically based to a consequent multi-modality treatment regimen was implemented. The periods of time before and after that change should be compared. METHODS AND PATIENTS: The data of the DOSAK registry entries on 1038 patients suffering from primary untreated oral and oropharyngeal carcinomas were updated with respect to follow-up and mortality data to achieve a 100% quality of follow-up. The end point (death) was reached in 67% of the overall population. Statistical analysis was carried out by the Trium Analysis Online corporation, Munich. RESULTS: The portion of female and older tumor patients increased, more than half of all tumor patients were clearly in stage IV of the disease at first referral. The portion of patients operated on persisted approximately (80%), the portion of additional treatment modalities could be increased considerably. The fact of a bony infiltration by the tumor and the operability remained highly significantly relevant for survival in multivariate analysis, despite of multi-modality treatment. The survival rate of the patients remained significantly dependent on the clinical stage of the disease in multivariate analysis but could be improved by 10% in the clinical stages II and III and in the patients who could not be operated on. All in all, the cutoff date was statistically relevant for survival in multivariate analysis, i.[Symbol: see text]e. the change in the treatment regimen had a verifiable positive effect on the survival of a unicentric overall population. CONCLUSION: Survival improvement in an overall population via change in treatment strategy is possible in relatively short time; the clinical stages II and III and the non-operable patients have the greatest benefit from a multi-modality treatment. 相似文献
7.
8.
7β-(6-取代-2-喹诺酮-3-乙酰氨基)头孢菌素的合成 总被引:1,自引:0,他引:1
以6-取代-2-喹诺酮-3-乙酸为侧链,用CDI法和潘化酯法与7-ADCA,7-ACA,7-ACT,和7-ACD缩合,合成了16个新的7β-(6-取代-2-喹诺酮-3-乙酰氨基)头孢菌素类化合物,通过溶媒转提,葡聚糖凝胶(Sephadex LH-20)柱层析及离心薄层层析分离精制,得到纯品。初步体外抑菌试验表明:新化合物对革兰氏阳性及某些阴性菌具有高度敏感性。大多数化合物对所试试验菌的抗菌活性与头孢唑啉和青霉素G钠相当,有些比它们还强。 相似文献
9.
L Kovacs A Zimmermann G Brockmann M Gühring H Baurecht N A Papadopulos K Schwenzer-Zimmerer R Sader E Biemer H F Zeilhofer 《Journal of plastic, reconstructive & aesthetic surgery》2006,59(11):1193-1202
Three-dimensional recording of the surface of the human body or of certain anatomical areas has gained an ever increasing importance in recent years. When recording living surfaces, such as the human face, not only has a varying degree of surface complexity to be accounted for, but also a variety of other factors, such as motion artefacts. It is of importance to establish standards for the recording procedure, which will optimise results and allow for better comparison and validation. In the study presented here, the faces of five male test persons were scanned in different experimental settings using non-contact 3D digitisers, type Minolta Vivid 910). Among others, the influence of the number of scanners used, the angle of recording, the head position of the test person, the impact of the examiner and of examination time on accuracy and precision of the virtual face models generated from the scanner data with specialised software were investigated. Computed data derived from the virtual models were compared to corresponding reference measurements carried out manually between defined landmarks on the test persons' faces. We describe experimental conditions that were of benefit in optimising the quality of scanner recording and the reliability of three-dimensional surface imaging. However, almost 50% of distances between landmarks derived from the virtual models deviated more than 2mm from the reference of manual measurements on the volunteers' faces. 相似文献
10.