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Advances in nanoparticles 2014年第3期3卷 114-121页

作者： juan adrián ramos guivar Arturo Isaías Martínez Ana Osorio Anaya Luis De Los Santos Valladares Lizbet León Félix Angel Bustamante Dominguez Cavendish Laboratory Department of Physics University of Cambridge Cambridge UK Centro de Investigación y Estudios Avanzados del Instituto Politécnico nacional Cinvestav Unidad Saltillo Ciudad de México México Ciudad de México México Laboratorio de Cerámicos y nanomateriales Facultad de Ciencias Físicas Universidad Nacional Mayor de San Marcos Lima Perú Laboratorio de nanotecnología e Innovación Tecnológica Departamento de Química e Ingeniería Química Universidad Nacional Mayor de San Marcos Lima Perú núcleo de Física Aplicada Instituto de Física Universidade de Brasília Brasília Brasil

Structural and magnetic studies of monophasic maghemite (γ-Fe2O3) magnetic nanocrystallites (MnCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe3O4) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80°C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe2O3 MnCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe2O3 MnCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.

关键词： Monophasic nanomaghemite Rietveld Refinement TEM SAED M-H Loops ZFC

Lifestyles of Older Adults in Castilla-La Mancha(Spain):Influence of Sex,Age,and Habitat

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Fudan Journal of the Humanities and Social Sciences 2024年第2期17卷 313-335页

作者： Esther Portal Martínez juan Lirio Castro David Alonso González JoséLuis Gómez ramos University of Castilla-La Mancha Talavera de la ReinaSpain Complutense University MadridSpain

This paper presents the quantitative research results of a comprehensive study titled“Current Profle of Older Adults in Castilla-La Mancha(Spain).”The study aims to understand and describe the characteristics of individuals aged 65 and above within this autonomous region,with a focus on the variables of sex,age,and habitat.A cross-sectional approach was employed,utilizing quantitative methods to collect data.To gather information,a customized questionnaire was developed to address the study objectives,covering various aspects such as sociodemographic factors,living conditions,leisure activities,social participation,and cultural interests.The survey was conducted via telephone,ensuring representation by employing gender quotas,age-group stratifcation,and considerations for habitat size.A representative sample of 1,065 participants was included in the study.The fndings reveal a degree of homogeneity in the lifestyles of older adults,with discernible variations infuenced by factors such as sex,habitat,and age.These results shed light on the diverse habits and experiences of older adults,emphasizing the signifcance of habitat conditions,social participation,and the aging process.

关键词： Lifestyle habits Older adults Habitat conditions Social participation Aging experience

Microsurgical management of radicular cyst using guided tissue regeneration technique:A case report

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World Journal of Clinical Cases 2024年第7期12卷 1346-1355页

作者： juan Carlos Gómez Mireles Eugenia Karina Martínez Carrillo Katia Alcalá Barbosa Evangelina Gutiérrez Cortés Javier González ramos Luis Antonio González Gómez Rubén Alberto Bayardo González Sarah Monserrat Lomelí Martínez Periodontics Specialty Department of Integral Dentistry ClinicsCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico Endodontics Specialty Department of Integral Dentistry ClinicsCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico Endodontics Specialty Department of ClinicsCentro Universitario de Los AltosUniversidad de GuadalajaraTepatitlán de Morelos 47620Mexico Specialty in Oral Pathology Surgical-Stomatological DepartmentAutonomous University of GuadalajaraZapopan 45129Mexico Independent Researcher Guadalajara 44340Mexico Department of Integral Dentistry Clinics Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico Department of Medical and Life Sciences Centro Universitario de la CiénegaUniversidad de GuadalajaraOcotlán 47810Mexico Master of Public Health Department of Well-being and Sustainable DevelopmentCentro Universitario del NorteUniversidad de GuadalajaraColotlán 46200Mexico

BACKGROUnD Radicular cyst is a lesion of odontogenic origin that arises from epithelial remains due to periapical periodontitis caused by inflammatory reactions generated at the apex of affected teeth with infected or necrotic pulps.The therapeutic mana gement of radicular cysts is controversial.There is only one case report of enucleation of a radicular cyst managed with microsurgery and apicoectomy,but without the use of the guided tissue regeneration(GTR)technique in the same surgical procedure.The present clinical case describes the management of a radicular cyst with microsurgical approach,performance of an apicoectomy of the tooth associated with the entity,application of GTR technique,use of a resorbable membrane of type I bovine collagen,and bovine xenograft.CASE SUMMARY A 68-year-old patient presented with a radicular cyst from an upper lateral incisor.The microsurgical management used was aimed at enucleating the chemical membrane,performing apicoectomy of the tooth along with careful and precise retrograde filling,and implementing GTR technique using a resorbable collagen membrane and bovine xenograft.The diagnosis of radicular cyst was confirmed using histopathological analysis.The patient underwent follow-up evaluations at 10 and 30 d postoperatively.At 4 months postoperative evaluation,she remained asymptomatic,and radiographs showed significant periapical healing with adequate bone formation.COnCLUSIOn These results suggest that microsurgical management using the GTR technique with collagen membrane and xenograft,contributes to bone regeneration.

关键词： Odontogenic cysts Apical periodontal cyst Dental root end cyst Case report

An Investigation into Forced Convection of a nanofluid Flowing in a Rectangular Microchannel under the Influence of a Magnetic Field

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Fluid Dynamics & Materials Processing 2024年第2期20卷 311-323页

作者： Muataz S.Alhassan Ameer A.Alameri Andrés Alexis Ramírez-Coronel I.B.Sapaev Azher M.Abed David-juan ramos-Huallpartupa Rahman S.Zabibah Division of Advanced nanomaterial Technologies Scientific Research CenterAl-Ayen UniversityThi-QarIraq Department of Chemistry College of ScienceUniversity of BabylonBabylonIraq Research Group in Educational Statistics National University of EducatiosnAzoguesEcuador Department Physics and Chemistry Tashkent Institute of Irrigation and Agricultural Mechanization EngineersNational Research UniversityTashkentUzbekistan Akfa University TashkentUzbekistan new Uzbekistan University TashkentUzbekistan Department of Airconditioning and Refrigeration Engineering Al-Mustaqbal University CollegeHilla51001Iraq Academic Department of Agro-Industrial Engineering and Technology Universidad Nacional JoséMaría ArguedasApurimacPerú The Islamic University NajafIraq

In line with recent studies,where it has been shown that nanoﬂuids containing graphene have a stronger capacity to boost the heat transfer coefﬁcient with respect to ordinary nanoﬂuids,experiments have been conducted using water with cobalt ferrite/graphene nanoparticles.In particular,a circular channel made of copper subjected to a constant heatﬂux has been considered.As nanoparticles are sensitive to the presence of a magneticﬁeld,different conditions have been examined,allowing both the strength and the frequency of such aﬁeld to span relatively wide ranges and assuming different concentrations of nanoparticles.According to theﬁndings,the addition of nanoparticles to theﬂuid causes its rotation speed to increase by a factor of two,whereas ultraviolet radiation plays a negligible role.The amount of time required to attain the maximum rotation speed of the nanoﬂuid and the nusselt number have been measured under both constant and alternating magneticﬁelds for a ferroﬂuid with a concentration of 0.5%and atﬂow Reynolds number of 550 and 1750.

关键词： nano fluid rectengular tube magnetic field

Epidemiology of work-related hand and wrist injuries in a referral center: A descriptive study

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World Journal of Orthopedics 2024年第7期15卷 650-659页

作者： Angélica M Rodríguez Ginna P Tocanchón Jessica T Villalba Luis M Pombo Aníbal A Teherán Gabriel Camero-ramos Karen P Ayala Gerhard M Acero Research Center Fundación Universitaria Juan N.CorpasBogotá111321Colombia Red Cross Cruz Roja Colombiana-Seccional Cundinamarca BogotáBogotá111221Colombia Vigilancia Epidemiológica Instituto Nacional de SaludBogotá111321Colombia

BACKGROUnD Occupational hand and wrist injuries(OHWIs)account for 25%of work-related accidents in low-and middle-income countries.In Colombia,more than 500000 occupational accidents occurred in 2021,and although the rate declined to less than 5%in 2020 and 2021,at least one in four accidents involved a hand or wrist injury.AIM To describe the OHWIs in workers seen at the emergency room at a second-level hospital in Colombia.METHODS An observational study was performed using data from workers who experienced OHWIs and attended a second-level hospital,between June,2020 and May,2021.The overall frequency of OHWIs,as well as their distribution by sociodemo-graphic,clinical,and occupational variables,are described.Furthermore,association patterns between sex,anatomical area(fingers,hand,wrist),and type of job were analyzed by correspondence analysis(CA).RESULTS There were 2.101 workers treated for occupational accidents,423(20.3%)were cases of OHWIs,which mainly affected men(93.9%)with a median age of 31 years and who worked mainly in mining(75.9%).OHWIs were more common in the right upper extremity(55.3%)and comprised different types of injuries,such as contusion(42.1%),laceration(27.9%),fracture(18.7%),and crush injury(15.6%).They primarily affected the phalanges(95.2%),especially those of the first finger(25.7%).The CAs showed associations between the injured anatomical area and the worker’s job that differed in men and women(explained variance>90%).COnCLUSIOn One out of five workers who suffered occupational accidents in Cundinamarca,Columbia had an OHWI,affecting mainly males employed in mining.This occupational profile is likely to lead to prolonged rehabilitation,and permanent functional limitations.Our results might be useful for adjusting preventive measures in cluster risk groups.

关键词： Accidents Occupational Epidemiology Hand injuries Wrist injuries Occupational health

增材制造Ti6Al4V合金的闪速等离子体电解氧化与在生理介质中的电化学行为

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Transactions of nonferrous Metals Society of China 2024年第4期34卷 1150-1166页

作者： H.MORA-SAnCHEZ C.ramos M.MOHEDAnO B.TORRES R.ARRABAL E.MATYKInA Departamento de Ingeniería Química y de Materiales Facultad de Ciencias QuímicasUniversidad Complutense de Madrid28040 MadridSpain CIDETEC Basque Research and Technology Alliance(BRTA)Po.Miramón 19620014 Donostia-San SebastiánSpain Departamento Matemática Aplicada Ciencia e Ingeniería de Materiales y Tecnología ElectrónicaUniversidad Rey Juan CarlosC/Tulipán s/nMóstoles 28933MadridSpain

研究激光粉末床熔融增材制造(AM)(又称直接金属激光烧结)技术制备的Ti6Al4V合金等离子体电解氧化(PEO)处理及其电化学行为。通过短时间(<120 s)PEO处理(也称闪速PEO),在AM合金和传统合金表面制备了3~10μm厚、含Ca和P的涂层。然后在改... 详细信息

研究激光粉末床熔融增材制造(AM)(又称直接金属激光烧结)技术制备的Ti6Al4V合金等离子体电解氧化(PEO)处理及其电化学行为。通过短时间(<120 s)PEO处理(也称闪速PEO),在AM合金和传统合金表面制备了3~10μm厚、含Ca和P的涂层。然后在改良的α-MEM溶液中,通过动电位极化曲线和电化学阻抗谱(EIS)评估了合金的电化学行为。与传统合金相比,AM合金中形成了细小的层片状α显微组织和层间小尺寸的β相颗粒,这促使了火花的产生,从而促进了PEO涂层的生长。闪速PEO涂层提高了传统合金和AM合金的耐腐蚀性,最薄的涂层(<3μm)提供了高达3倍的保护。AM Ti6Al4V由于其高的晶界密度,易受局部缝隙腐蚀的影响。而即使短至35 s的闪速PEO处理也足以成功避免这种情况。

关键词：增材制造激光粉末床熔融等离子体电解氧化闪速PEO 钛缝隙腐蚀 α-MEM

Machine learning insights concerning inflammatory and liver-related risk comorbidities in non-communicable and viral diseases

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World Journal of Gastroenterology 2022年第44期28卷 6230-6248页

作者： J Alfredo Martínez Marta Alonso-Bernáldez Diego Martínez-Urbistondo juan A Vargas-nuñez Ana Ramírezde Molina Alberto Dávalos Omar ramos-Lopez Precision nutrition and Cardiometabolic Health Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Department of Internal Medicine Hospital Universitario HM SanchinarroMadrid 28050Spain Servicio de Medicina Interna Hospital Universitario Puerta de Hierro MajadahondaMadrid 28222MajadahondaSpain Molecular Oncology and nutritional Genomics of Cancer Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Laboratory of Epigenetics of Lipid Metabolism Madrid Institute of Advanced Studies-Food InstituteMadrid 28049Spain Medicine and Psychology School Autonomous University of Baja CaliforniaTijuana 22390Baja CaliforniaMexico

The liver is a key organ involved in a wide range of functions,whose damage can lead to chronic liver disease(CLD).CLD accounts for more than two million deaths worldwide,becoming a social and economic burden for most countries.Among the different factors that can cause CLD,alcohol abuse,viruses,drug treatments,and unhealthy dietary patterns top the list.These conditions prompt and perpetuate an inflammatory environment and oxidative stress imbalance that favor the development of hepatic fibrogenesis.High stages of fibrosis can eventually lead to cirrhosis or hepatocellular carcinoma(HCC).Despite the advances achieved in this field,new approaches are needed for the prevention,diagnosis,treatment,and prognosis of CLD.In this context,the scientific community is using machine learning(ML)algorithms to integrate and process vast amounts of data with unprecedented performance.ML techniques allow the integration of anthropometric,genetic,clinical,biochemical,dietary,lifestyle and omics data,giving new insights to tackle CLD and bringing personalized medicine a step closer.This review summarizes the investigations where ML techniques have been applied to study new approaches that could be used in inflammatoryrelated,hepatitis viruses-induced,and coronavirus disease 2019-induced liver damage and enlighten the factors involved in CLD development.

关键词： Machine learning Liver inflammation Liver disease Viral diseases Comorbidity

novel TInF2 gene mutation in dyskeratosis congenita with extremely short telomeres:A case report

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World Journal of Clinical Cases 2022年第33期10卷 12440-12446页

作者： Verónica Judith Picos-Cárdenas Saúl Armando Beltrán-Ontiveros JoséAlfonso Cruz-ramos JoséAlfredo Contreras-Gutiérrez Eliakym Arámbula-Meraz Carla Angulo-Rojo Alma Marlene Guadrón-Llanos Emir Adolfo Leal-León Dora María Cedano-Prieto juan Pablo Meza-Espinoza Laboratorio de Genética Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Centro de Investigación y Docencia en Ciencias de la Salud Hospital Civil de CuliacánUniversidad Autónoma de SinaloaCuliacán 80030SinaloaMexico Departamento de Clínicas Médicas Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico Facultad de Medicina Universidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Laboratorio de Genética y Biología Molecular Facultad de Ciencias Químico-BiológicasUniversidad Autónoma de SinaloaCuliacán 80010SinaloaMexico Laboratorio de neurociencias Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Laboratorio de Diabetes y Comorbilidades Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Facultad de Medicina Universidad Autónoma de TamaulipasMatamoros 87349TamaulipasMexico

BACKGROUnD Dyskeratosis congenita is a rare disease characterized by bone marrow failure and a clinical triad of oral leukoplakia,nail dystrophy,and abnormal skin pigmentation.The genetics of dyskeratosis congenita include mutations in genes involved in telomere maintenance,including TInF2.CASE SUMMARY Here,we report a female patient who presented thrombocytopenia,anemia,reticulate hyperpigmentation,dystrophy in fingernails and toenails,and leukoplakia on the tongue.A histopathological study of the skin showed dyskeratocytes;however,a bone marrow biopsy revealed normal cell morphology.The patient was diagnosed with dyskeratosis congenita,but her family history did not reveal significant antecedents.Whole-exome sequencing showed a novel heterozygous punctual mutation in exon 6 from the TInF2 gene,namely,nM_001099274.1:-c.854delp.(Val285-Alafs*32).An analysis of telomere length showed short telomeres relative to the patient’s age.COnCLUSIOn The disease in this patient was caused by a germline novel mutation of TInF2 in one of her parents.

关键词： Dyskeratosis congenita TInF2 Germline mutation novel mutation Short telomeres Case report

Reconstruction of debris-flow activity in a temperate mountain forest catchment of central Mexico

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Journal of Mountain Science 2019年第9期16卷 2096-2109页

作者： Osvaldo FRAnCO-ramos Markus STOFFEL juan Antonio BALLESTEROS-CAnOVAS Instituto de Geografia. Universidad nacionalAutonoma de Mexico Ciudad Universitaria Coyoacan 04510 Mexico Dendrolab.ch Department of Earth Sciences University of Geneva 13 rue des Maraichers CH-1205 Geneva Switzerland Climate Change Impacts and Risks in the Anthropocene (C-CIA) Institute for Environmental Sciences University of Geneva 66 Boulevard Carl-Vogt CH-1205 Geneva Switzerland Department F.-A. Forelfor Environmental and Aquatic Sciences University of Geneva 66 Boulevard Carl-Vogt CH- 1205 Geneva Switzerland

The use of dendrochronology to study and date geomorphic processes in volcanic environments is still incipient, even more so on the volcanic slopes covered by temperate forests in central Mexico. Mass movements, such as debris flows, often impact forest stands where they cause damage to individual trees, thereby generating growth disturbances(GD) in the tree-ring records. The identification and dating of GD enables reconstruction of the age of trees colonizing bare surfaces after major events, but also allows the assessment of the frequency or spatial distribution of past geomorphic process activity. Here we used increment cores from 65 Pinus leiophylla, Abies religiosa, and Alnus jorullensis trees growing in the Axal gorge, on the southern slopes of La Malinche volcano, to unravel past debris-flow activity both temporally and spatially. Based on the combination of GD records, a weighted tree response index(Wit), field evidence and hydrometeorological records, we reconstructed 23 debris flows since 1933.Interestingly, almost two-thirds of the reconstructed years with debris-flow activity in Axal gorge match with events recorded in Axaltzintle gorge located on the nE slopes of La Malinche. These findings suggest a regional triggering mechanism, most likely related to the occurrence of hurricanes. This research could be useful for disaster risk management of the La Malinche national Park.

关键词： Debris flows La Malinche volcano Dendrogeomorphology Temperate forest Hydrometeorological phenomena

Prediabetes and type 2 diabetes implication in central proliferation and neurogenesis

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neural Regeneration Research 2015年第1期10卷 28-29页

作者： Carmen Infante-Garcia juan Jose ramos-Rodriguez Monica Garcia-Alloza Division of Physiology School of MedicineUniversidad de CádizCádiz 11003Spain

Type 2 diabetes （T2D） is an important risk factor for developing dementias, including Alzheimer＇s disease （AD）. Hyperinsulin- emia and glucose intolerance, as features of T2D, might increase the neurodegeneration process, synaptic loss and brain atrophy, leading to cognitive impairment observed in AD. Also, adult neurogenesis seems to be impaired in AD models. Therefore, we have studied morphological alterations, cell proliferation and neurogenesis in the central nervous system （CnS） from a classical model of T2D, the db/db mouse, and in a prediabetes insulin-resistant model, obtained after long-term high fat diet （HFD） administration to C57B1/6 mice. Db/db mice showed an age-dependent cortical and hippocampal atrophy, whereas in HFD mice cortex and hippocampus were preserved. neurogen- esis and cell proliferation were increased in young db/db mice, when compared with control mice, whereas no differences were detected in the prediabetic model. We also detected significant correlations between metabolic parameters and central atrophy, altered proliferation and neurogenesis in the central nervous system. Altogether these data support that glycaemia control in elderly patients, could help to control central alterations and improve dementia prognosis.

关键词： Prediabetes and type 2 diabetes implication in central proliferation and neurogenesis