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Athletes ECG Stress Characteristics in Division Ⅱ College Athletes:A Preliminary Analysis

Journal of Science in Sport and Exercise 2020年第2期2卷 183-187页

作者： Ludmila Cosio-Lima Lauren Adlof jeffrey simpson Amy Crawley Youngil Lee University of West Florida 11000 University Parkway#72/220PensacolaFL 32514USA

Purpose Two-thirds of sudden cardiac deaths are attributable to underlying cardiovascular conditions in young collegiate athletes.A 12-lead exercise stress test is a screening tool that can detect these abnormalities that may predispose collegiate athletes to sudden cardiac death,and can ensure athletes meet the physical demands of training and *** pur-pose of this study was to evaluate the electrocardiographic(ECG)characteristics of DivisionⅡcollegiate athletes using the Seattle *** Fifty two athletes(males=26;females=26)of various ethnicities(Caucasian=65%,Latino/Hispanic=20%,and African American=15%);from soccer(27%),tennis(17%),basketball(15%),softball(14%),cross country(9%),volleyball(6%),football(6%),and swimming(6%)completed cardiovascular screening with resting and exercise 12-lead ECG *** abnormalities and anthropometrics were compared across race,gender,and sports using an ***-square analysis was used to test for differences in the frequency of ECG findings across gender,race,and *** Although sport was not a predictor for an abnormal ECG,73%of the athletes presented with athletes'heart con-figuration,which was significantly higher in males than females(P=0.02).The highest occurrence of these adaptations was observed in 100%of Latino/Hispanic athletes,compared to 75%of African American and 64%of Caucasian *** With newer and more sensitive ECG screening criteria,the prevalence of false-positive tests is *** research should focus on advancing the sensitivity and specificity of ECG interpretation in more diverse athletic populations regarding race and *** increasing incidence of sudden cardiac death in collegiate athletes warrants future research that evaluates the impact of implementing the 12-lead ECG as a standard screening tool for collegiate athletes.

关键词： Sudden cardiac death 12-Lead ECG Athlete's heart

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Design of Hard Compaction Rollers for Automated Fiber Placement on Complex Mandrel Geometries

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Journal of Mechanics Engineering and Automation 2018年第6期8卷 259-263页

作者： Tom T. Zacchia Farjad Shadmehri jeffrey Fortin-simpson Suong V. Hoa Concordia Center for Composites (CONCOM) Department of Mechanical Industrial and Aerospace Engineering Concordia University Montreal H3G1M8 Canada

This paper presents a methodology for designing hard compaction rollers for an AFP(automated fiber placement)head with a hot gas torch heating system for laying thermoplastic CFRP(carbon fiber reinforced plastic)*** manufacturing defects and alternative designs are reviewed to highlight the importance of AFP compaction roller conformity and surface *** formulation of a general parametric description of the design challenge is derived and adequately addresses the problem on a tow-to-tow basis.

关键词： AFP CFRP compaction roller

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Peroxidase-Like Reactivity at Iron-Chelation Sites in a Mesoporous Synthetic Melanin

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CCS Chemistry 2021年第3期3卷 1483-1490页

作者： Yijun Xie Kelsey A.Krug Kristine S.Cay Mark Kalaj Naneki C.McCallum Zofia E.Siwicka Zhao Wang Nathan C.Gianneschi Michael D.Burkart jeffrey D.Rinehart Materials Science and Engineering Program University of CaliforniaSan DiegoLa JollaCA 92093 Department of Chemistry and Biochemistry University of CaliforniaSan DiegoLa JollaCA 92093 Department of Chemistry Northwestern UniversityEvanstonIL 60208 International Institute of Nanotechnology Simpson-Querrey InstituteChemistry of Life Processes InstituteNorthwestern UniversityEvanstonIL 60208 Pritzker School of Molecular Engineering University of ChicagoChicagoIL 60637 Lurie Cancer Center Northwestern UniversityEvanstonIL 60208 Department of Materials Sciences and Engineering Northwestern UniversityEvanstonIL 60208 Department of Biomedical Engineering Northwestern UniversityEvanstonIL 60208

High catalytic activity and substrate specificity make enzymes a rich source of inspiration for catalyst ***-opting the advantages of natural materials while tuning them to a modified form and purpose,however,is not a straightforward synthetic *** of L-3,4-dihydroxyphenylalanine(L-DOPA)results in amorphous polymer nanoparticles that are similar in many ways to natural ***,the authors introduce mesoporosity and iron ion chelation to synthesize a variant of the L-DOPA polymer with high peroxidase-like *** results indicate catalytic reaction with peroxide under mildly acidic conditions(pH 5.4 and 6)with a greater maximum reaction velocity(Vmax)than horseradish peroxidase(HRP)at optimal pH 3.5–*** between Fe(Ⅲ)and Fe(Ⅱ)loading indicates that either can be used as a starting point to trigger reactivity,though Fe(Ⅱ)loading leads to materials with twice the Vmax of the Fe(Ⅲ)-loaded *** lack of catalyst degradation despite the redox changes and presence of radical species is consistent with the robust nature and redox versatility of polydopamine-based materials and demonstrates strong potential as a versatile redox-catalysis platform.

关键词： L-DOPA mesoporosity peroxidase-like reactivity iron ion chelation catalysis

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