全文获取类型
收费全文 | 22841篇 |
免费 | 1607篇 |
国内免费 | 123篇 |
专业分类
耳鼻咽喉 | 295篇 |
儿科学 | 532篇 |
妇产科学 | 408篇 |
基础医学 | 3012篇 |
口腔科学 | 497篇 |
临床医学 | 2156篇 |
内科学 | 4118篇 |
皮肤病学 | 241篇 |
神经病学 | 2637篇 |
特种医学 | 880篇 |
外国民族医学 | 1篇 |
外科学 | 3010篇 |
综合类 | 366篇 |
一般理论 | 28篇 |
预防医学 | 2409篇 |
眼科学 | 734篇 |
药学 | 1819篇 |
中国医学 | 48篇 |
肿瘤学 | 1380篇 |
出版年
2023年 | 96篇 |
2022年 | 181篇 |
2021年 | 391篇 |
2020年 | 226篇 |
2019年 | 349篇 |
2018年 | 465篇 |
2017年 | 360篇 |
2016年 | 360篇 |
2015年 | 423篇 |
2014年 | 646篇 |
2013年 | 985篇 |
2012年 | 1409篇 |
2011年 | 1501篇 |
2010年 | 805篇 |
2009年 | 699篇 |
2008年 | 1364篇 |
2007年 | 1483篇 |
2006年 | 1440篇 |
2005年 | 1489篇 |
2004年 | 1427篇 |
2003年 | 1329篇 |
2002年 | 1335篇 |
2001年 | 293篇 |
2000年 | 279篇 |
1999年 | 305篇 |
1998年 | 308篇 |
1997年 | 280篇 |
1996年 | 230篇 |
1995年 | 258篇 |
1994年 | 167篇 |
1993年 | 206篇 |
1992年 | 244篇 |
1991年 | 204篇 |
1990年 | 201篇 |
1989年 | 194篇 |
1988年 | 165篇 |
1987年 | 185篇 |
1986年 | 172篇 |
1985年 | 177篇 |
1984年 | 169篇 |
1983年 | 160篇 |
1982年 | 187篇 |
1981年 | 210篇 |
1980年 | 170篇 |
1979年 | 115篇 |
1978年 | 122篇 |
1977年 | 131篇 |
1976年 | 113篇 |
1975年 | 80篇 |
1972年 | 62篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Jamaal L. Benjamin MD PhD Rebecca Dennis DO Stacy White Jr MD David Munson MD Sudha A. Anupindi MD Maciej Piskunowicz MD Kassa Darge MD PhD Ami Gokli MD Misun Hwang MD 《Journal of ultrasound in medicine》2020,39(5):1031-1036
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates. 相似文献
3.
4.
Nathan Scudder James Robertson Sally F. Kelty Simon J. Walsh Dennis McNevin 《The Australian journal of forensic sciences》2020,52(2):235-241
ABSTRACTForensic DNA analysis is dependent on comparing the known and the unknown. Expand the number of known profiles, and the likelihood of a successful match increases. Forensic use of DNA is moving towards comparing samples of unknown origin with publicly available genetic data, such as the records held by genetic genealogy providers. Use of forensic genetic genealogy has yielded a number of recent high-profile successes but has raised ethical and privacy concerns. Navigating family trees is complex, even more so when combined with a comparison of genetic relationships. This intelligence-gathering process has led to occasional false leads, and its use also risks a public backlash, similar to concerns over Cambridge Analytica. A cautious approach to use of this technique is therefore warranted. 相似文献
5.
6.
Antony E. Shrimpton Robert L. Schelper Reinhold P. Linke John Hardy Richard Crook Dennis W. Dickson Takashi Ishizawa Richard L. Davis 《Neuropathology》2007,27(3):228-232
Over 100 mutations in the presenilin‐1 gene (PSEN1) have been shown to result in familial early onset Alzheimer disease (EOAD), but only a relatively few give rise to plaques with an appearance like cotton wool (CWP) and/or spastic paraparesis (SP). A family with EOAD, seizures and CWP was investigated by neuropathological study and DNA sequencing of the PSEN1 gene. Aβ was identified in leptomeningeal vessels and in cerebral plaques. A single point mutation, p.L420R (g.1508T > G) that gives rise to a missense mutation in the eighth transmembrane (TM8) domain of PS1 was identified in two affected members of the family. p.L420R (g.1508T > G) is the mutation responsible for EOAD, seizures and CWP without SP in this family. 相似文献
7.
Validation of a simplified technique for using the POPQ pelvic organ prolapse classification system 总被引:3,自引:2,他引:1
Steven Swift Sarah Morris Vikki McKinnie Robert Freeman Eckhard Petri Richard J. Scotti Peter Dwyer 《International urogynecology journal》2006,17(6):615-620
Our objective was to determine the inter-examiner agreement of a simplified pelvic organ prolapse quantification (POPQ) exam and to assess its correlation with the standard POPQ exam. This study consists of two parts; both were preformed in a prospective, randomized, blinded fashion on women presenting with complaints attributed to pelvic organ support defects. The first study was done to determine the inter-examiner reliability of a simplified POPQ exam. The simplified POPQ exam is based on the POPQ with similar ordinal staging but with only four points measured instead of nine. Forty-eight women underwent exams by five different investigators. The order of exams was randomized and the examiners were blinded to the results of each other’s findings. The results of these two exams were compared using weighted kappa statistics. The second part of the study was done to determine the inter-system agreement between the simplified vs standard POPQ exam. A group of 49 women were examined by four different investigators: one using the simplified and the other using standard POPQ exams. The order of the exams was randomized and the examiners were blinded to the results of each other’s exam. Kendall’s tau-b statistics were used to determine the inter-system agreement. For the inter-examiner reliability of the POPQ exam, the average age was 60±13 years. The weighted kappa statistics for the inter-examiner reliability of the simplified prolapse classification system were 0.86 for the overall stage, 0.89 and 0.86 for the anterior and posterior vaginal walls, respectively, 0.82 for the apex/cuff, and 0.72 for the cervix. All demonstrate significant agreement. For the inter-system association between the simplified POPQ and standard POPQ, the average age was 61±15 year. The Kendall’s tau-b value for overall stage was 0.90, 0.83, and 0.87 for the anterior and posterior walls respectively, and 0.78 for the cuff/apex and 0.98 for the cervix. There is good inter-examiner agreement of a simplified POPQ classification system and it appears to have good inter-system association with the POPQ.IUGA Standardization of Terminology Committee members: Robert Freeman MD (chairman), Steven Swift, Eckhard Petri MD, Richard J. Scotti MD, and Peter Dwyer MD. 相似文献
8.
Elhaji Youssef A.; Stoica Ileana; Dennis Sheldon; Purisima Enrico O.; Lumbroso Rose; Beitel Lenore K.; Trifiro Mark A. 《Human molecular genetics》2006,15(9):1561
Human Molecular Genetics (2006) 15, 921931; 相似文献
9.
Predictors of clustering of tuberculosis in Greater Vancouver: a molecular epidemiologic study 总被引:3,自引:0,他引:3 下载免费PDF全文
10.