全文获取类型
收费全文 | 2540152篇 |
免费 | 205458篇 |
国内免费 | 4947篇 |
专业分类
耳鼻咽喉 | 36022篇 |
儿科学 | 77100篇 |
妇产科学 | 66250篇 |
基础医学 | 355332篇 |
口腔科学 | 70989篇 |
临床医学 | 232871篇 |
内科学 | 502334篇 |
皮肤病学 | 50463篇 |
神经病学 | 217892篇 |
特种医学 | 102910篇 |
外国民族医学 | 899篇 |
外科学 | 385632篇 |
综合类 | 58020篇 |
现状与发展 | 2篇 |
一般理论 | 1119篇 |
预防医学 | 202989篇 |
眼科学 | 59672篇 |
药学 | 188250篇 |
5篇 | |
中国医学 | 4602篇 |
肿瘤学 | 137204篇 |
出版年
2019年 | 20716篇 |
2018年 | 28430篇 |
2017年 | 21948篇 |
2016年 | 24049篇 |
2015年 | 27233篇 |
2014年 | 39276篇 |
2013年 | 58844篇 |
2012年 | 80604篇 |
2011年 | 84696篇 |
2010年 | 49635篇 |
2009年 | 47545篇 |
2008年 | 79918篇 |
2007年 | 84766篇 |
2006年 | 85357篇 |
2005年 | 83233篇 |
2004年 | 80042篇 |
2003年 | 76786篇 |
2002年 | 75534篇 |
2001年 | 113860篇 |
2000年 | 117593篇 |
1999年 | 99792篇 |
1998年 | 29803篇 |
1997年 | 27055篇 |
1996年 | 26784篇 |
1995年 | 25870篇 |
1994年 | 24261篇 |
1993年 | 22577篇 |
1992年 | 80085篇 |
1991年 | 77037篇 |
1990年 | 74120篇 |
1989年 | 71356篇 |
1988年 | 66345篇 |
1987年 | 65239篇 |
1986年 | 61791篇 |
1985年 | 58880篇 |
1984年 | 44861篇 |
1983年 | 38222篇 |
1982年 | 23651篇 |
1981年 | 21027篇 |
1979年 | 41643篇 |
1978年 | 29359篇 |
1977年 | 24681篇 |
1976年 | 23166篇 |
1975年 | 24210篇 |
1974年 | 29867篇 |
1973年 | 28253篇 |
1972年 | 26361篇 |
1971年 | 24279篇 |
1970年 | 22834篇 |
1969年 | 21151篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
Dear Sir In the recently published Task force report, under section Fibrinolyticregimens, the authors recommend not to re-administerstreptokinase for at least 10 years. The reference supportingthis statement is Ref. 51. After evaluating this paper and lookinginto the literature my comments 相似文献
92.
M. Lenartowicz M. Kowal D. Buda-Lewandowska J. Styrna 《Journal of inherited metabolic disease》2003,25(8):647-659
Summary: The mosaic (Atp7a
mo-ms
) is an X-linked, lethal mutation in mice. In mosaic mutant males, many clinical features characteristic of defective copper metabolism have been observed and they die at the age of 15 days, exhibiting strongsimilarities to the brindled and macular mutants. About 4% of the mutant males live to sexual maturity and some of them are fertile. In this paper, alterationsin the structure of the kidney from adult mutants are described. Owing to an inherited defect of efflux, copper is accumulated in the kidney of the mutants up to a toxic level and this leads to severe damage of the renal cortex. Pathological changes in the kidney mostly affected the structure of the renal corpuscle and renaltubules. 相似文献
93.
Colin J McKay 《World journal of surgery》2006,30(12):2234-2235
94.
B Nkgudi K A Robertson J Volmink B M Mayosi 《Suid-Afrikaanse tydskrif vir geneeskunde》2006,96(3):206-208
OBJECTIVE: To determine whether under-reporting of rheumatic fever occurs at hospital, municipal, provincial and national levels of the South African health system. BACKGROUND: Information on the incidence of rheumatic fever (RF) and the prevalence of rheumatic heart disease (RHD) is required for the prevention of valvular heart disease in developing countries. In South Africa, RF was made a notifiable condition in 1989. It has recently been suggested that the reporting of RF cases may be incomplete, possibly because of underreporting by health care professionals and deficient administration of the disease notification system in South Africa. METHOD AND RESULTS: We assessed whether underreporting of RF cases occurs by comparing the numbers of RF cases reported per year at hospital, municipal, provincial and national levels from 1990 to 2004. There was a fall in the number of RF cases reported per year at national and provincial level over the 15 years of observation. A detailed analysis of the number of RF cases reported at hospital, municipal and provincial level for a 5-year period showed that more cases were diagnosed in one hospital (serving a smaller population) than were captured at municipal and provincial level (serving a larger population), suggesting underreporting by health care professionals. There were discrepancies in the number of cases reported at municipal, provincial and national level, suggesting poor administration of the notification system. CONCLUSION: There appears to be underreporting of RF cases by health care professionals, and poor administration of the RF notification system. Health care professionals need to be educated about the statutory requirement to notify all RF cases in South Africa. An effective national disease notification system is required. 相似文献
95.
96.
97.
98.
Emir Q. Haxhija Prof. Dr. Johannes M. Mayr Wolfgang Grechenig Michael E. Höllwarth 《Operative Orthopadie und Traumatologie》2006,18(2):120-134
OBJECTIVE: Surgical reduction and retention of apophyseal avulsion injuries at the medial epicondyle to prevent joint instability, lasting malalignment, or pseudarthrosis. INDICATIONS: Absolute: intraarticular apophyseal dislocation of the medial epicondyle, complete lesion of the ulnar nerve. Relative: dislocation of the apophysis (> 4 mm) in children > 5 years of age; the need for intervention increases in children as the degree of dislocation, age, and athletic activity increase. CONTRAINDICATIONS: Dislocation of the medial epicondyle (< or = 4 mm) in children < 5 years of age, provided the fragment location is not intraarticular. SURGICAL TECHNIQUE: Open reduction of the apophysis through a medial approach. Identification of the ulnar nerve. In young children or with small fragments fixation with Kirschner wire. Screw fixation in older children or for larger fragments. POSTOPERATIVE MANAGEMENT: Long upper-arm plaster cast until wound healing is achieved. Subsequently, upper-arm plaster cast for 3 weeks. Removal of Kirschner wires after 4-6 weeks, screw removal after 8-12 weeks. Physiotherapy only if marked reduction of elbow mobility is found 6 weeks after cast removal. RESULTS: From January 1, 1994 to December 31, 2003, 25 children with an average age of 12 years suffering from medial epicondylar avulsion fractures were operated on using open reduction and Kirschner wire fixation. An average of 3 years after the injury 14 of these children underwent follow-up examination using a procedure that took subjective, clinical and radiologic parameters into account. Two children showed a slight reduction in overall strength of the injured extremity when compared with the contralateral extremity. One child had a flexion deficit of 10 degrees, all other children showed movement limitations of < or = 5 degrees compared to the contralateral extremity. In all the cases available to follow-up, there was a slight increase in valgus alignment of the elbow joint compared with the uninjured side (3 degrees on average). All fractures consolidated within 6 weeks. 相似文献
99.
This article describes the proceedings of the 2006 Annual Meeting of the Fetal Alcohol Spectrum Disorders Study Group (FASDSG), which was held in Baltimore, Maryland on June 24, 2006. The meeting was held in conjunction with the annual meeting of the Research Society on Alcoholism and was supported by a grant from the National Institute on Alcohol Abuse and Alcoholism. The 2005-2006 FASDSG officers, Daniel J. Bonthius (President), Heather Carmichael Olson (Vice-President), and Jennifer Thomas (Secretary-Treasurer), organized the meeting. Nationally prominent speakers delivered plenary lectures on topics of newborn screening, ethics, and neuroscience. Selected members of the FASDSG provided brief scientific data (FASt) reports, describing new research findings. Representatives from national agencies involved in fetal alcohol syndrome (FAS) research, treatment, and prevention provided updates regarding priorities, funding, and agency activities. Presentations were also made by the 2006 Student Merit Award recipient and by the 2006 Rosett Award recipient. The meeting served as a forum for clinicians, neuroscientists, psychologists, social scientists, and other professionals to discuss recent advances in FAS research and to identify the most important gaps in the understanding of alcohol-induced teratology. 相似文献
100.