全文获取类型
收费全文 | 7683篇 |
免费 | 507篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 102篇 |
儿科学 | 211篇 |
妇产科学 | 121篇 |
基础医学 | 1311篇 |
口腔科学 | 190篇 |
临床医学 | 636篇 |
内科学 | 1686篇 |
皮肤病学 | 215篇 |
神经病学 | 640篇 |
特种医学 | 433篇 |
外国民族医学 | 2篇 |
外科学 | 1232篇 |
综合类 | 61篇 |
一般理论 | 3篇 |
预防医学 | 512篇 |
眼科学 | 95篇 |
药学 | 364篇 |
中国医学 | 5篇 |
肿瘤学 | 384篇 |
出版年
2021年 | 118篇 |
2020年 | 68篇 |
2019年 | 97篇 |
2018年 | 125篇 |
2017年 | 94篇 |
2016年 | 149篇 |
2015年 | 153篇 |
2014年 | 186篇 |
2013年 | 258篇 |
2012年 | 356篇 |
2011年 | 408篇 |
2010年 | 184篇 |
2009年 | 200篇 |
2008年 | 345篇 |
2007年 | 382篇 |
2006年 | 356篇 |
2005年 | 307篇 |
2004年 | 308篇 |
2003年 | 335篇 |
2002年 | 294篇 |
2001年 | 239篇 |
2000年 | 270篇 |
1999年 | 220篇 |
1998年 | 85篇 |
1997年 | 74篇 |
1996年 | 60篇 |
1995年 | 54篇 |
1994年 | 52篇 |
1993年 | 46篇 |
1992年 | 118篇 |
1991年 | 117篇 |
1990年 | 106篇 |
1989年 | 110篇 |
1988年 | 121篇 |
1987年 | 139篇 |
1986年 | 119篇 |
1985年 | 113篇 |
1984年 | 87篇 |
1983年 | 69篇 |
1981年 | 48篇 |
1979年 | 75篇 |
1978年 | 64篇 |
1976年 | 46篇 |
1974年 | 61篇 |
1973年 | 74篇 |
1972年 | 53篇 |
1971年 | 52篇 |
1970年 | 49篇 |
1969年 | 43篇 |
1968年 | 51篇 |
排序方式: 共有8203条查询结果,搜索用时 156 毫秒
1.
2.
Oil-emulsified (OE) and aqueous (Aq) vaccines were prepared with the same batch of inactivated A24 8345 foot and mouth disease virus (FMDV). Calves born to vaccinated dams did not respond to the Aq vaccine 30 or 90 days post partum. When the OE vaccine was used on a similar group of calves, no responses were elicited up to 21 days post partum. However, calves 30 or more days old responded like adult cattle to the OE vaccine. When the OE vaccine was used in colostral antibody-free calves 3-30 days old, all animals showed good antibody responses but, in calves vaccinated 3 or 7 days post partum, antibodies were detectable only after a considerable period of time. Our results show that both passively acquired colostral antibodies and age are important in the response of very young calves to FMDV oil vaccines. From a practical point of view, in endemic areas where adult cattle are periodically vaccinated, vaccination of calves between 30 and 60 days post partum with OE vaccines would lead to high levels of herd protection. 相似文献
3.
4.
Trauma und Berufskrankheit - Zusammenfassung Die angemessene Behandlung der Radiusköpfchenfrakturen erfolgt nach korrekter Klassifikation unter Berücksichtigung von Begleitverletzungen... 相似文献
5.
The Resource-Based Relative Value Scale. Toward the development of an alternative physician payment system 总被引:2,自引:0,他引:2
This article describes the design and methods of a study currently under way to develop a Resource-Based Relative Value Scale (RBRVS); an alternative basis for establishing the payment rate for the services and procedures (S/Ps) of physicians in medical and surgical specialties. Physician resource inputs to be measured include (1) S/P time, (2) pre-S/P and post-S/P times, (3) intensity, (4) practice costs, including malpractice premiums, and (5) the cost of specialty training. These five factors will be combined to produce an RBRVS denominated in nonmonetary units. In the initial phase of the study, data on time and intensity will be obtained through a national survey of physicians who perform these S/Ps. In the second, consensus phase of the project, the investigators will convene a panel of representatives of the medical profession, third-party payers, consumers, and other interested parties to examine areas of agreement and disagreement as to how an RBRVS should be used for policy purposes. The final results of this study are expected by the summer of 1988. 相似文献
6.
7.
Kinzl Geelen F. Ferrio Langsteiner Dubitscher Pfister H. Donalies Kranz G. A. Adam Koller v. Baeyer Zillig G. Rost Sjvall Einar Hahn Rubner Max H. Hofmann Bresowsky Mller H. Liguori-Hohenauer Geller Braun F. Leibbrand Tbben H. 《International journal of legal medicine》1940,33(4):353-364
International Journal of Legal Medicine - 相似文献
8.
Dr. Annette Raabe Cordula Petersen Andreas Krüll 《Strahlentherapie und Onkologie》2007,183(7):360-365
PURPOSE: To study the effect of treatment time prolongation following initial dose acceleration on the response of subcutaneously growing R1H tumor. MATERIAL AND METHODS: Continuous standard fractionation (30 fractions/40 days) was compared to initially accelerated treatment (30 fractions/21 days) followed by five to two fractions per week yielding total treatment times from 40 to 72 days. Local tumor control was assessed as endpoint. RESULTS: Radiation dose to control 50% of the tumors (TCD50%) decreased statistically significant from 83.5 Gy (95% confidence interval [CI]: 78.6 .. 88.4) for standard fractionation to 74.1 Gy (95% CI: 72.7 .. 75.5) determined for all accelerated treatment arms (p = 0.003). Prolongation of treatment time after initial acceleration from 40 to 72 days led to a small but statistically not significant increase in TCD50% from 72.0 Gy (95% CI: 71.0 .. 72.9) to 76.2 Gy (95% CI: 69.9 .. 82.4) corresponding to a repopulated dose of 0.9 Gy per week. This time factor is considerably smaller than for conventional radiation treatment as determined in previous experiments. CONCLUSION: The results indicate that initially accelerated irradiation not only improves local tumor control but also minimizes the negative effect of treatment time prolongation. This might be due to changes in tumor cell repopulation kinetics. 相似文献
9.
Long-term complications of renal transplantation 总被引:3,自引:0,他引:3
W E Braun 《Kidney international》1990,37(5):1363-1378
10.