全文获取类型
收费全文 | 152篇 |
免费 | 10篇 |
专业分类
儿科学 | 3篇 |
妇产科学 | 3篇 |
基础医学 | 45篇 |
口腔科学 | 1篇 |
临床医学 | 6篇 |
内科学 | 25篇 |
皮肤病学 | 11篇 |
神经病学 | 20篇 |
特种医学 | 1篇 |
外科学 | 13篇 |
预防医学 | 13篇 |
眼科学 | 1篇 |
药学 | 3篇 |
中国医学 | 1篇 |
肿瘤学 | 16篇 |
出版年
2022年 | 8篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 10篇 |
2013年 | 8篇 |
2012年 | 19篇 |
2011年 | 27篇 |
2010年 | 11篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2004年 | 5篇 |
2003年 | 4篇 |
2002年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
排序方式: 共有162条查询结果,搜索用时 15 毫秒
131.
132.
Chun‐An Chen Emeline Crutcher Harinder Gill Tanya N. Nelson Laurie A. Robak Marjolijn C. J. Jongmans Rolph Pfundt Chitra Prasad Roberta A. Berard Madeleine Fannemel Eirik Frengen Doriana Misceo Keri Ramsey Yaping Yang Christian P. Schaaf Xia Wang 《Human mutation》2020,41(10):1738-1744
Congenital heart defects and skeletal malformations syndrome (CHDSKM) is a rare autosomal dominant disorder characterized by congenital heart disease, skeletal abnormalities, and failure to thrive. CHDSKM is caused by germline mutations in ABL1. To date, three variants have been in association with CHDSKM. In this study, we describe three de novo missense variants, c.407C>T (p.Thr136Met), c.746C>T (p.Pro249Leu), and c.1573G>A (p.Val525Met), and one recurrent variant, c.1066G>A (p.Ala356Thr), in six patients, thereby expanding the phenotypic spectrum of CHDSKM to include hearing impairment, lipodystrophy‐like features, renal hypoplasia, and distinct ocular abnormalities. Functional investigation of the three novel variants showed an increased ABL1 kinase activity. The cardiac findings in additional patients with p.Ala356Thr contribute to the accumulating evidence that patients carrying either one of the recurrent variants, p.Tyr245Cys and p.Ala356Thr, have a high incidence of cardiac abnormalities. The phenotypic expansion has implications for the clinical diagnosis of CHDSKM in patients with germline ABL1 variants. 相似文献
133.
Vitarelli A Morichetti MC Conde Y Cimino E D'Orazio S Stellato S Padella V Caranci F Battaglia D 《Ultrasound in medicine & biology》2007,33(8):1224-1235
Several studies have reported that patients (pts) with severe aortic stenosis and similar pressure gradients or even similar aortic valve areas may have quite different symptomatic status and clinical outcomes suggesting that other factors might have a significant impact on the pathophysiology of this disease. Our purpose was to assess the severity of subendocardial wall dysfunction in symptomatic and asymptomatic pts with aortic stenosis using tissue Doppler imaging (TDI), strain rate imaging (SRI) and cyclic variation of integrated backscatter (IB). We studied 68 pts with aortic valvar stenosis and 46 subjects with no signs of heart disease. SRI/IB indexes were calculated in the apical four chambers views at endocardial level. Early diastolic endocardial strain rate showed the best correlation with transvalvar pressure gradients and valve areas. Compared with controls, symptomatic pts showed a more marked decrease in endocardial strain, strain rate and cyclic variation of IB. Receiver operating characteristic (ROC) curves suggested that the thresholds offering an adequate compromise between sensitivity and specificity for the prediction of symptoms were >/=60 mm Hg for the pressure gradient, less than 0.60 cm(2)/m(2) for aortic valve area, less than 20% for strain, less than 2.0 s(-1) for strain rate and less than 3.0 dB for cyclic variation. The combination of pressure gradient, aortic valve area and SRI/IB parameters resulted in an improvement of the overall performance for predicting the symptomatic state. Thus, SRI/IB parameters have an incremental value in differentiating symptomatic and asymptomatic pts with aortic stenosis compared with conventional hemodynamic parameters. 相似文献
134.
Antiprion activity of cholesterol esterification modulators: a comparative study using ex vivo sheep fibroblasts and lymphocytes and mouse neuroblastoma cell lines
下载免费PDF全文
![点击此处可从《Antimicrobial agents and chemotherapy》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Pani A Norfo C Abete C Mulas C Putzolu M Laconi S Orrù CD Cannas MD Vascellari S La Colla P Dessì S 《Antimicrobial agents and chemotherapy》2007,51(11):4141-4147
Our studies on the role of cholesterol homeostasis in the pathogenesis of scrapie revealed abnormal accumulation of cholesterol esters in ex vivo peripheral blood mononuclear cells (PBMCs) and skin fibroblasts from healthy and scrapie-affected sheep carrying a scrapie-susceptible genotype compared to sheep with a resistant genotype. Similar alterations were observed in mouse neuroblastoma N2a cell lines persistently infected with mouse-adapted 22L and RML strains of scrapie that showed up to threefold-higher cholesterol ester levels than parental N2a cells. We now report that proteinase K-resistant prion protein (PrPres)-producing cell populations of subclones from scrapie-infected cell lines were characterized by higher cholesterol ester levels than clone populations not producing PrPres. Treatments with a number of drugs known to interfere with different steps of cholesterol metabolism strongly reduced the accumulation of cholesterol esters in ex vivo PBMCs and skin fibroblasts from scrapie-affected sheep but had significantly less or no effect in their respective scrapie-resistant or uninfected counterparts. In scrapie-infected N2a cells, inhibition of cholesterol esters was associated with selective antiprion activity. Effective antiprion concentrations of cholesterol modulators (50% effective concentration [EC(50)] range, 1.4 to 40 microM) were comparable to those of antiprion reference compounds (EC(50) range, 0.6 to 10 microM). These data confirm our hypothesis that abnormal accumulation of cholesterol esters may represent a biological marker of susceptibility to prion infection/replication and a novel molecular target of potential clinical importance. 相似文献
135.
Landi Doriana Signori Alessio Cellerino Maria Fenu Giuseppe Nicoletti Carolina Gabri Ponzano Marta Mancuso Elisabetta Fronza Marzia Ricchiuto Maria Elena Boffa Giacomo Inglese Matilde Marfia Girolama Alessandra Cocco Eleonora Frau Jessica 《Journal of neurology》2022,269(2):796-804
Journal of Neurology - To analyse the course of multiple sclerosis (MS) after fingolimod withdrawal in a multicentre cohort. Patients who discontinued fingolimod were included. Relapses, Expanded... 相似文献
136.
137.
Lucia Migliore Doriana Saracino Alessia Bonelli Renato Colognato Maria R. D'Errico Andrea Magrini Antonio Bergamaschi Enrico Bergamaschi 《Environmental and molecular mutagenesis》2010,51(4):294-303
The induction of DNA and chromosome damage following in vitro exposure to carbon nanotubes (CNT) was assessed on the murine macrophage cell line RAW 264.7 by means of the micronucleus (MN) and the comet assays. Exposures to two CNT preparations (single‐walled CNT (SWCNT > 90%) and multiwalled CNT (MWCNT > 90%) were performed in increasing mass concentrations (0.01–100 μg/ml). The frequency of micronuclei was significantly increased in cells treated with SWCNT (at doses above 0.1 μg/ml), whereas MWCNT had the same effect at higher concentrations (1 μg/ml) (P < 0.05). The results of the comet assay revealed that the effects of treatment with SWCNT were detectable at all concentrations tested (1–100 μg/ml); oxidized purines increased significantly, whereas pyrimidines showed a significant increase (P < 0.001) only at the highest concentration (100 μg/ml). In cells treated with MWCNT, an increase in DNA migration due to the oxidative damage to purines was observed at a concentration of 1 and 10 μg/ml, whereas pyrimidines showed a significant increase only at the highest mass concentration tested. However, both SWCNT and MWCNT induced a statistically significant cytotoxic effect at the highest concentrations tested (P < 0.001). These findings suggest that both the MN and comet assays can reliably detect small amount of damaged DNA at both chromosome and nuclear levels in RAW 264.7 cells. Moreover, the modified version of the comet assay allows the specific detection of the induction of oxidative damage to DNA, which may be the underlying mechanism involved in the CNT‐associated genotoxicity. Environ. Mol. Mutagen., 2010. © 2010 Wiley‐Liss, Inc. 相似文献
138.
Prosperini Luca Cortese Antonio Lucchini Matteo Boffa Laura Borriello Giovanna Buscarinu Maria Chiara Capone Fioravante Centonze Diego De Fino Chiara De Pascalis Daniela Fantozzi Roberta Ferraro Elisabetta Filippi Maria Galgani Simonetta Gasperini Claudio Haggiag Shalom Landi Doriana Marfia Girolama Mataluni Giorgia Millefiorini Enrico Mirabella Massimiliano Monteleone Fabrizia Nociti Viviana Pontecorvo Simona Romano Silvia Ruggieri Serena Salvetti Marco Tortorella Carla Zannino Silvana Di Battista Giancarlo 《Journal of neurology》2020,267(3):694-702
Journal of Neurology - Patients with multiple sclerosis on long-term injectable therapies may suffer from the so-called “needle fatigue”, i.e., a waning commitment to continue with the... 相似文献
139.
Nicola Maffulli Raffaele Greco Luigi Greco Doriana D'Alterio 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(1):106-112
Maffulli N, Greco R, Greco L, D'Alterio D. Treadmill exercise in Neopolitan children and adolescents. Acta Pædiatr 1994;83:106–112. Stockholm ISSN 0803–5253
Two hundred and eighty healthy children from Naples, Italy (140 boys and 140 girls) aged 4–17 years were studied using Bruce walking treadmill protocol to voluntary exhaustion. Endurance time and double product increased with age. Systolic blood pressure increased linearly during the test. Multivariate analysis showed that body weight and age were the best predictors of endurance time. Endurance time averaged 15.2 ± 2.8 min in boys and 13.7 ± 2.3 min in girls ( p = 0.0001). Mean±SD double product at peak exercise was 264.3 ± 63 (boys) and 242 ± 44 (girls) ( p = 0.01). Sinus arrhythmia was present in 78% of the children and disappeared at a mean heart rate of 112 ± 16 beats/min during exercise. The voltage of the R wave on V4 lead decreased in all but four children during the test (delta R= -0.25±0.24 mV). The P and T waves increased in almost all children. No ST depression or upward sloping was detected. The voltage of the PR isoelectric line remained constant. The J point was displaced downwards in 78% of children, unchanged in 11% and displaced upwards in the remaining 11% of the children. The present study gives reference parameters for a walking treadmill test in Southern European children. 相似文献
Two hundred and eighty healthy children from Naples, Italy (140 boys and 140 girls) aged 4–17 years were studied using Bruce walking treadmill protocol to voluntary exhaustion. Endurance time and double product increased with age. Systolic blood pressure increased linearly during the test. Multivariate analysis showed that body weight and age were the best predictors of endurance time. Endurance time averaged 15.2 ± 2.8 min in boys and 13.7 ± 2.3 min in girls ( p = 0.0001). Mean±SD double product at peak exercise was 264.3 ± 63 (boys) and 242 ± 44 (girls) ( p = 0.01). Sinus arrhythmia was present in 78% of the children and disappeared at a mean heart rate of 112 ± 16 beats/min during exercise. The voltage of the R wave on V
140.
Ventura M Weigl S Carbone L Cardone MF Misceo D Teti M D'Addabbo P Wandall A Björck E de Jong PJ She X Eichler EE Archidiacono N Rocchi M 《Genome research》2004,14(9):1696-1703
Using comparative FISH and genomics, we have studied and compared the evolution of chromosome 3 in primates and two human neocentromere cases on the long arm of this chromosome. Our results show that one of the human neocentromere cases maps to the same 3q26 chromosomal region where a new centromere emerged in a common ancestor of the Old World monkeys approximately 25-40 million years ago. Similarly, the locus in which a new centromere was seeded in the great apes' ancestor was orthologous to the site in which a new centromere emerged in the New World monkeys' ancestor. These data suggest the recurrent use of longstanding latent centromeres and that there is an inherent potential of these regions to form centromeres. The second human neocentromere case (3q24) revealed unprecedented features. The neocentromere emergence was not accompanied by any chromosomal rearrangement that usually triggers these events. Instead, it involved the functional inactivation of the normal centromere, and was present in an otherwise phenotypically normal individual who transmitted this unusual chromosome to the next generation. We propose that the formation of neocentromeres in humans and the emergence of new centromeres during the course of evolution share a common mechanism. 相似文献