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Toughening of Immiscible rPS/SAN Blends by SEBS Elastomers: Properties and Morphology

Journal of Materials Science and Chemical Engineering 2022年第3期10卷 42-62页

作者： Khaled Bedjaoui Rodrigo Navarro Rachida Krache Juan Lopez Valentin Rebeca Herrero Calderon alberto fernandez torres Angel Marcos fernandez Laboratory Multiphas Polymeric Materials (LMPMP) Faculty of Technology University Ferhat Abbas Setif-1 Setif Algerie Instituto de Ciencia y Tecnologia de Polimeros (CSIC) Department of Fisica de Polimeros Elastomeros y Aplicaciones Energeticas Madrid Spain

In this research, an attempt was made to improve compatibility in a polymer blend composed of incompatible constituents, namely, recycled polystyrene (rPS) and polystyrene-co-acrylonitrile (SAN), through the addition of a compatibilizer. The compatibilizing agent, styrene-ethylenebutadiene-styrene block copolymer (SEBS), was added to the polymer blend in ratios of 5 and 10 wt%. For this purpose, blends of rPS and SAN at different ratios, without and with varying concentrations of compatibilizer, were prepared by melt blending using a co-rotating twin-screwextruder. Mechanical properties including tensile and impact strength, rheological properties (RPA), thermal behaviour (DSC) and morphological characteristics (SEM) were evaluated. According to the results obtained by complex viscosity, the blends behave as a pseudoplastic fluid. The results showed that the addition of SEBS increased the Izod impact strength and the elongation at break and decreased the tensile strength and tensile modulus. rPS/SAN blend modified with SEBS had better mechanical properties than the rPS/SAN alloy. SEM photographs revealed that the SEBS was not only distributed in the SAN phase but also distributed in rPS phase in rPS/SAN/SEBS blend. Furthermore, DSC analysis for blends of rPS/SAN gave a good indication of the improvement on miscibility for most compositions. SEM micrographs of tensile fracture surfaces indicated that the formation of the co-continuous phase and the improvement of interface adhesion are the most important reasons for the excellent tensile properties of the rPS/SAN/SEBS blends. Within the range of analysed compositions, the morphologies investigated by SEM are typical of immiscible blends.

关键词： Recycled Polystyrene SAN Toughening Polymer Blends Rheology

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Influence of oxidation of automatic transmission fluids (ATFs) and sliding distance on friction coefficients of a wet clutch in the running-in stage

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Friction 2021年第2期9卷 401-414页

作者： Leonardo Israel FARFAN-CABRERA Ezequiel alberto GALLARDO-HERNÁNDEZ Manuel VITE-torres Jesús Gilberto GODÍNEZ-SALCEDO Tecnologico de Monterrey Escuela de Ingeniería y CienciasAve.Eugenio Garza Sada 2501Monterrey 64849México Instituto Politécnico Nacional SEPI-Escuela Superior de Ingeniería Mecánica y EléctricaUnidad ZacatencoGrupo de TribologíaCol.LindavistaCiudad de México 07738México Instituto Politécnico Nacional ESIQIEIPNCol.LindavistaCiudad de México 07738México

In this paper,the influence of oxidation of automatic transmission fluids(ATFs)and sliding distance on the friction coefficients of a wet clutch in approached running-in conditions was *** ATFs were oxidized by a laboratory process approaching oxidation occurred in actual *** was evaluated by means of increase in carbonyl compounds and depletion of zinc dialkyldithiophosphates(ZDDPs)***,the changes in kinematic viscosity and viscosity index were ***-ondisk tests were conducted to replicate the actual sliding contact in a wet *** pin specimens were cut from friction material composite plates and the disks were actual steel separators both from an automotive wet *** coefficient, μ,was measured at progressive sliding velocity,ν,to obtain μ–νcurves at 26 and 100°*** μ–νtests were consecutively run using the same pair of specimens and *** cumulative sliding distance for each μ–νtest generated surface flattening using the *** friction coefficients of the wet clutch increased due to the ATFs oxidation meanwhile the dm/dv values decreased in most *** suggests that ATF oxidation can enhance torque capacity of the wet clutch,but it could reduce anti-shudder *** sliding distance improved the slopes in the μ–νresults using fresh ATFs meanwhile it generated a slope decrease by using aged ATFs.

关键词： wet clutch friction oil oxidation automatic transmission fluid(ATF)

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Pitfalls of barcodes in the study of worldwide SARSCoV-2 variation and phylodynamics

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Zoological Research 2021年第1期42卷 87-93页

作者： Jacobo Pardo-Seco alberto Gómez-Carballa Xabier Bello Federico Martinón-torres Antonio Salas Unidade de Xenética Instituto de Ciencias Forenses(INCIFOR)Facultade de MedicinaUniversidade de Santiago de Compostelaand GenPoB Research GroupInstituto de Investigación Sanitaria(IDIS)Hospital Clínico Universitario de Santiago(SERGAS)Galicia 15706Spain Genetics Vaccines and Pediatric Infectious Diseases Research Group(GENVIP)Instituto de Investigación Sanitaria de Santiago(IDIS)and Universidad de Santiago de Compostela(USC)Galicia 15706Spain Translational Pediatrics and Infectious Diseases Department of PediatricsHospital Clínico Universitario de Santiago de Compostela(SERGAS)Galicia 15706Spain

DEAR EDITOR,Analysis of SARS-CoV-2 genome variation using a minimal number of selected informative sites conforming a genetic barcode presents several *** show that purely mathematical procedures for site selection should be supervised by known phylogeny(i)to ensure that solid tree branches are represented instead of mutational hotspots with poor phylogeographic proprieties,and(ii)to avoid phylogenetic *** propose a procedure that prevents information redundancy in site selection by considering the cumulative informativeness of previously selected sites(as a proxy for phylogenetic-based criteria).This procedure demonstrates that,for short barcodes(e.g.,11 sites),there are thousands of informative site combinations that improve previous *** also show that barcodes based on worldwide databases inevitably prioritize variants located at the basal nodes of the phylogeny,such that most representative genomes in these ancestral nodes are no longer in ***,coronavirus phylodynamics cannot be properly captured by universal genomic barcodes because most SARS-CoV-2 variation is generated in geographically restricted areas by the continuous introduction of domestic variants.

关键词： dynamics properly purely

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Biogeographical informativeness of Y-STR haplotypes

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Science Bulletin 2019年第19期64卷 1381-1384页

作者： Jacobo Pardo-Seco alberto Gómez-Carballa Xabier Bello Federico Martinón-torres Antonio Salas Unidade de Xenética Instituto de Ciencias Forenses(INCIFOR)Facultade de MedicinaUniversidade de Santiago de Compostelaand GenPoB Research GroupInstitutode Investigaciones Sanitarias(IDIS)Hospital Clínico Universitario de Santiago(SERGAS)GaliciaSpain Grupo de Investigación en Genética VacunasInfecciones y Pediatría(GENVIP)Universidade de Santiago de Compostelaand Hospital Clínico Universitario de Santiago(SERGAS)GaliciaSpain

Research on biogeographical ancestry(BGA)is becoming of growing interest in forensic genetics and in the biomedical literature(1)Thus,for instance,the need to predict ethnicity of an unknown suspect based on DNA profiles found at the crime scene is of maximum interest in criminalistics[2],and several autosomal SNP panels have been designed and tested for BGA investigations[3,4].Most of these panels aim at discriminating three main continental groups(sub-Saharan Africans,Europeans,and Asians)by way of testing a number of ancestry informative markers(AIMs)that run from a few dozens to a few hundred[5](see more background in Supplementary data online).

关键词： BGA STR Biogeographical informativeness of Y-STR haplotypes

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Phylogeography of SARS-CoV-2 pandemic in Spain:a story of multiple introductions,micro-geographic stratification,founder effects,and super-spreaders

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Zoological Research 2020年第6期41卷 605-620页

作者： alberto Gomez-Carballa Xabier Bello Jacobo Pardo-Seco Maria Luisa Perez del Molino Federico Martinon-torres Antonio Salas Unidade de Xendtica Instituto de Ciencias Forenses(I NCI FOR)Facultade de MedicinaUniversidade de Santiago de Compostelaand GenPoB Research GroupInstituto de Investigaci6n Sanitaria(IDIS)Hospital Clinico Universitario de Santiago(SERGAS)Galicia 15706Spain Genetics Vaccines and Pediatric Infectious Diseases Research Group(GENVIP)Instituto de Investigacion Sanitaria de Santiago(IDIS)and Universidade de Santiago de Compostela(USC)Galicia 15706Spain Translational Pediatrics and Infectious Diseases Department of PediatricsHospital Clinico Universitario de Santiago de Compostela(SERGAS)Galicia 15706Spain Servicio de Microbiologia y Parasitologia Complejo Hospitalario Universitario de Santiago de CompostelaSantiago de CompostelaGalicia15706 Spain

Spain has been one of the main global pandemic epicenters for coronavirus disease 2019(COVID-19).Here,we analyzed>41000 genomes(including>26000 high-quality(HQ)genomes)downloaded from the GISAID repository,including 1245(922 HQ)sampled in *** aim of this study was to investigate genome variation of novel severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and reconstruct phylogeographic and transmission patterns in *** analysis suggested at least 34 independent introductions of SARS-CoV-2 to Spain at the beginning of the *** lineages spread very successfully in the country,probably favored by super-spreaders,namely,A2 a4(7.8%),A2 a5(38.4%),A2 a10(2.8%),B3 a(30.1%),and B9(8.7%),which accounted for 87.9% of all genomes in the Spanish *** distinct feature of the Spanish SARS-Cov-2 genomes was the higher frequency of B lineages(39.3%,mainly B3 a+B9)than found in any other European *** B3 a,B9,(and an important sub-lineage of A2 a5,namely,A2 a5 c)most likely originated in Spain,the other three haplogroups were imported from other European *** B3 a strain may have originated in the Basque Country from a B3 ancestor of uncertain geographic origin,whereas B9 likely emerged in *** time of the most recent common ancestor(TMRCA)of SARS-CoV-2 suggested that the first coronavirus entered the country around 11 February 2020,as estimated from the TMRCA of B3 a,the first lineage detected in the ***,earlier claims that the D614 G mutation is associated to higher transmissibility is not consistent with the very high prevalence of COVID-19 in Spain when compared to other countries with lower disease incidence but much higher frequency of this mutation(56.4% in Spain vs.82.4% in rest of Europe).Instead,the data support a major role of genetic drift in modeling the micro-geographic stratification of virus strains across the country as well as the role of SARS-CoV-2 super-spreaders.

关键词： Covid-19 SARS-CoV-2 Genomics Phylogeny Phylogeography

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Y-chromosome Peruvian origin of the 500-year-old Inca child mummy sacrificed in Cerro Aconcagua (Argentina)

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Science Bulletin 2018年第22期63卷 1457-1459页

作者： Antonio Salas Laura Catelli Jacobo Pardo-Seco alberto Gomez-Carballa Federico Martinon-torres Joaquin Roberto-Barcena Carlos Vullo Unidade de Xenetica Instituto de Ciencias ForensesFacultade de MedicinaUniversidade de Santiago de Compostela (USC)and GenPoB Research GroupInstituto de Investigaciones Sanitarias (IDIS)Hospital Clinico Universitario de Santiago (SERGAS)GaliciaSpain Equipo Argentino de Antropologia Forense Independencia 644-3AEdif.EME1CordobaArgentina Translational Pediatrics and Infectious Diseases Hospital Clinico Universitario de SantiagoSantiago de CompostelaSpain GENVIP Research Group (***) Instituto de Investigacion Sanitaria de SantiagoGaliciaSpain Instituto Etnologico de la Universidad Nacional de Cuyo (UNC) MendozaArgentina

A frozen mummy was found in Cerro Aconcagua (Argentina)in 1985(Fig.1a-c).Archaeologists identified this mummy as a seven-year-old Inca sacrifice victim living at the time of the Inca Civilization about 500years ago [1].The child was sacrificed following an Incan ritual known as *** complete mitochondrial DNA (mtDNA) genome of this mummy was recently analyzed in Gomez-Carballa et al.[2].This mitogenome belongs to a new sub-branch of the Native American phylogeny named C1bi dated to approximately 14 thousand years ago (loja).Information retrieved from a large database of mtDNA profiles indicated the existence of a few closely related haplotypes in Peru (including one haplotype retrieved from ancient DNA of an individual belonging to the Wari Empire)and the Aymaras from *** these data suggested a Peruvian Inca origin for this C1bi haplotype,in good agreement with archaeological reports [1].

关键词：木乃伊儿童

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Fatty acid intake in relation to reproductive hormones and testicular volume among young healthy men

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Asian Journal of Andrology 2017年第2期19卷 184-190页

作者： Lidia Minguez-Alarcon Jorge E Chavarro JJaime Mendiola Manuela Roca Cigdem Tanrikut Jesus Vioque Niels Jorgensen alberto M torres-Cantero Department of Environmental Health Harvard School of Public Health Boston Massachusetts USA Department of Health and Social Sciences Division of Preventive Medicine and Public Health University of Murcia School of Medicine IMIB-Arrixaca Espinardo (Murcia) Spain Department of Nutrition Harvard School of Public Health Boston Massachusetts USA Department of Epidemiology Harvard School of Public Health Boston Massachusetts USA Channing Division of Network Medicine Department of Medicine Brigham and Women's Hospital and Harvard Medical School Boston Massachusetts USA Roca Fertility Advanced Clinic Management SLU Murcia Spain Department of Urology Massachusetts General Hospital Boston Massachusetts USA Department of Surgery Harvard Medical School Boston Massachusetts USA ClBER Epidemiology and Public Health (ClBERESP) Institute of Health Ill (ISClII) Madrid Spain Department of Public Health Miguel Hernandez University EIche-Alicante Spain Department of Growth and Reproduction University of Copenhagen Rigshospitalet Copenhagen Denmark Regional Campus of International Excellence 'Campus Mare Nostrum' University of Murcia Murcia Spain

Emerging evidence suggests that dietary fats may influence testicular function. However, most of the published literature on this field has used semen quality parameters as the only proxy for testicular function. We examined the association of fat intake with circulating reproductive hormone levels and testicular volume among healthy young Spanish men. This is a cross-sectional study among 209 healthy male volunteers conducted between October 2010 and November 2011 in Murcia Region of Spain. Participants completed questionnaires on lifestyle, diet, and smoking, and each underwent a physical examination, and provided a blood sample. Linear regression was used to examine the association between each fatty acid type and reproductive hormone levels and testicular volumes. Monounsaturated fatty acids intake was inversely associated with serum blood levels of calculated free testosterone, total testosterone, and inhibin B. A positive association was observed between the intake of polyunsaturated fatty acids, particularly of omega-6 polyunsaturated fatty acids, and luteinizing hormone concentrations. In addition, the intake of trans fatty acids was associated with lower total testosterone and calculated free testosterone concentrations （Ptrend = 0.01 and 0.02, respectively）. The intake of omega-3 polyunsaturated fatty acids was positively related to testicular volume while the intake of omega-6 polyunsaturated fatty acids and trans fatty acids was inversely related to testicular volume. These data suggest that fat intake, and particularly intake of omega 3, omega 6, and trans fatty acids, may influence testicular function.

关键词： fat intake reproductive health reproductive hormones trans fatty acids young healthy men

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Association between physical activity and cardiovascular risk factors:Dose and sex matter

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Journal of Sport and Health Science 2021年第5期10卷 604-606页

作者： Alejandro Santos-Lozano alberto torres Barran Pablo fernandez-Navarro Pedro L.Valenzuela Adrian Castillo-Garcia Luis MRuilope David Rios Insua Jose M.Ordovas Victoria Ley Alejandro Lucia i+HeALTH Department of Health SciencesEuropean University Miguel de CervantesValladolid 47012Spain Research Institute of the Hospital 12 de Octubre(imas12 PaHerg group)and(CIBER en Fragilidad y Envejecimiento Saludable-CIBEFES)Madrid 28041Spain Institute of Mathematical Sciences(ICMAT-CSIC) Madrid 28049Spain d Cancer and Environmental Epidemiology Unit National Center for EpidemiologyCarlos III Institute of HealthMadrid 28029Spain Consortium for Biomedical Research in Epidemiology&Public Health(CIBER en Epidemiologia y Salud Publica-CIBERESP) Madrid 28029Spain Department of Systems Biology University of AlcalaMadrid 28801Spain Fissac-Physiology Health and Physical ActivityMadrid 28801Spain Hypertension Unit and Cardiorenal Translational Laboratory Research Institute of the Hospital 12 de Octubre(imas12)Madrid 28041Spain Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University BostonMA 02111USA Spanish State Research Agency Ministry of ScienceInnovation and UniversitiesMadrid 28046Spain Faculty of Sport Sciences Universidad Europea de MadridMadrid 28670Spain

Dear Editor,ETadegn TagedPFailure to meet World Health Organization(WHO)-determined minimum physical activity(PA)levels is an established risk factor for cardiovascular disease(CVD),^(1)but evidence is still scarce on its effects on other CVD risk ***,whether or not there are sex-specific effects on the association between PA and CVD risk is a matter of controversy,with some authors observing a protective effect of PA in men but not in women,^(2)and others finding the opposite trend.^(3)

关键词： cardiovascular protective finding

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Minimally invasive nephrectomy for inflammatory renal disease

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Asian Journal of Urology 2020年第4期7卷 345-350页

作者： Paula Andrea Pena Lynda torres-Castellanos German Patino Stefania Prada Luis Gabriel Villarraga Nicolas fernandez Pontificia Universidad Javeriana School of MedicineBogota D.C.Colombia Department of Urology Hospital Universitario San IgnacioPontificia Universidad JaverianaSchool of MedicineBogota D.C.Colombia Division of Urology Hospital Universitario San IgnacioPontificia Universidad JaverianaBogota D.C.Colombia Division of Urology Hospital Universitario San IgnacioPontificia Universidad JaverianaSchool of MedicineBogota D.C.Colombia Department of Urology Fundacion Santa Fe de BogotaColombia Division of Urology Hospital for SickKidsUniversity of TorontoTorontoCanada

Objective:Once chronic inflammatory renal disease(IRD)develops,it creates a severe peri-fibrotic process,which makes it a relative contraindication for minimally invasive surgery(MIS).Our objective is to show that laparoscopic nephrectomy(LN)is a surgical option in IRD with fewer complications and better ***:Retrospective review of patients who underwent a modified-surgical laparoscopic transperitoneal nephrectomy was *** search included all operated patients between May 2013 and May 2018 that had a pathology result with any renal inflammatory condition(xanthogranulomatous pyelonephritis,chronic nephritis,and renal tuberculosis).We describe intra-operative variables such as operative time,blood loss,conversion rate,postoperative complications and length of hospital ***:There were 51 patients who underwent laparoscopic nephrectomy with a confirmatory pathology report for *** identified four(8%)major complications;three of them required transfusion and one conversion to open *** mean operative time was 233108 *** estimated blood loss was 206242 mL excluding the conversion cases and 281423 mL including *** mean length of hospital stay was 3.02.0 ***:Laparoscopic nephrectomy for IRD can safely be *** is a reproducible technique with low risks and complication *** experience supports that releasing the kidney first and leaving the hilum for the end is a safe approach when vascular structures are embedded into a single block of inflammatory and scar tissue.

关键词： Inflammation Kidney diseases Laparoscopy Minimally invasive surgical procedures Nephrectomy Nephritis Nephroureterectomy

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Effect of magnesium on the aluminothermic reduction rate of zinc oxide obtained from spent alkaline battery anodes for the preparation of Al–Zn–Mg alloys

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International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 458-465页

作者： Rocio Ochoa Alfredo Flores Jesus torres Cinvestav-Saltillo

The aluminothermic reduction of zinc oxide（ZnO） from alkaline battery anodes using molten Al may be a good option for the elaboration of secondary 7000-series alloys. This process is affected by the initial content of Mg within molten Al, which decreases the surface tension of the molten metal and conversely increases the wettability of ZnO particles. The effect of initial Mg concentration on the aluminothermic reduction rate of ZnO was analyzed at the following values： 0.90wt%, 1.20wt%, 4.00t%, 4.25wt%, and 4.40wt%. The ZnO particles were incorporated by mechanical agitation using a graphite paddle inside a bath of molten Al maintained at a constant temperature of 1123 K and at a constant agitation speed of 250 r/min, the treatment time was 240 min and the ZnO particle size was 450？500 mesh. The results show an increase in Zn concentration in the prepared alloys up to 5.43wt% for the highest initial concentration of Mg. The reaction products obtained were characterized by scanning electron microscopy and X-ray diffraction, and the efficiency of the reaction was measured on the basis of the different concentrations of Mg studied.

关键词： aluminothermic reduction alkaline batteries zinc oxide waste utilization aluminum zinc magnesium alloys

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