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The differential genetic signatures related to climatic landscapes for jaguars and pumas on a continental scale

Integrative Zoology 2021年第1期16卷 2-18页

作者： Marina ZANIN Noa GONZALEZ-BORRAJO cuauhtémoc chávez Yamel RUBIO Bart HARMSEN Claudia KELLER Pablo VILLALVA Ana Carolina SRBEK-ARAUJO Leonora Pires COSTA Francisco PALOMARES Biology Department Federal University of MaranhãoSão LuísBrazil Departamento de Biologia de la Conservación Estación Biológica de DoñanaSevillaSpain Departamento de Ciencias Ambientales Universidad Autónoma MetropolitanaMexico CityMexico Escuela de Biologia Universidad Autónoma de SinaloaCuliacánMexico Panthera New YorkUSA Biodiversity Coordination Amazon Research InstituteManausBrazil Biology Department Vila Velha UniversityVila VelhaBrazil Biological Sciences Department Federal University of Espírito SantoVitóriaBrazil

Modern and paleoclimate changes may have altered species dynamics by shifting species’niche suitability over space and *** analyze whether the current genetic structure and isolation of the two large American felids,jaguar(Panthera onca)and puma(Puma concolor),are mediated by changes in climatic suitability and connection routes over modern and paleoclimatic *** estimate species distribution under 5 climatic landscapes(modern,Holocene,last maximum glaciations[LMG],average suitability,and climatic instability)and correlate them with individuals’genetic isolation through causal modeling on a resemblance *** species exhibit genetic isolation patterns correlated with LMG climatic suitability,suggesting that these areas may have worked as“allele refuges.”However,the jaguar showed higher vulnerability to climate changes,responding to modern climatic suitability and connection routes,whereas the puma showed a continuous and gradual transition of genetic *** differential responsiveness to climate change,both species are subjected to the climatic effects on genetic configuration,which may make them susceptible to future climatic changes,since these are progressing faster and with higher intensity than changes in the ***,the effects of climatic changes should be considered in the design of conservation strategies to ensure evolutionary and demographic processes mediated by gene flow for both species.

关键词： causal modeling climatic landscape ecological niche modeling gene flow linear mixed model

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Link between caries,periodontitis,and pregnancy:The role of personalized oral hygiene

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World Journal of Clinical Cases 2025年第6期13卷 51-57页

作者： Melissa Martínez Nieto Martha Leticia De León Rodríguez Francisco Javier Alcaraz Baturoni Alma Alicia Soto chávez Sarah Monserrat LomelíMartínez Periodontics Program Department of Integrated Dentistry ClinicsCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico Department of Medical and Life Sciences Centro Universitario de la CiénegaUniversidad de GuadalajaraOcotlán 47810JaliscoMexico Master of Public Health Department of Well-being and SustainableCentro Universitario del NorteUniversidad de GuadalajaraColotlán 46200Mexico

Optimal health during pregnancy is crucial for ensuring the well-being of the mother and the developing *** article is focused on the impact of oral health and the role of personalized oral hygiene management in addressing prevalent dental issues among pregnant women,with particular emphasis on periodontal disease and dental *** the high prevalence of these dental problems and their association with obstetric complications such as pre-term birth and low birth weight,many pregnant women do not receive adequate dental *** gap in care is often due to misconceptions about the safety of dental treat-ments during pregnancy and lack of awareness on the part of healthcare *** of the impacts of oral health and personalization of oral hygiene strategies such as tailored education and support,have proven effective in improving oral health in this *** reductions in the incidence of caries and periodontal disease may be achieved by adapting care to the specific needs of each patient,thereby enhancing maternal and fetal health *** of personalized oral hygiene management into maternal health pro-grams and enhancement of ongoing education for pregnant women and healthcare professionals are essential steps in the reduction of pregnancy-related risks and improvement of maternal and neonatal *** Tip:In this article,we reviewed a recent study on the effects of personalized oral hygiene management on the oral health of pregnant women,as discussed in the article by Men et *** study demonstrated that personalized oral hygiene interventions significantly improved oral health outcomes during pregnancy by reducing the prevalence of dental caries and periodontal *** emphasized the importance of individualized oral care programs that integrate education and tailored support,and we highlighted their significance in enhancing maternal and fetal *** approach underscores the need for

关键词： Pregnancy Periodontal disease Periodontitis Dental caries Oral hygiene

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Early performance of two tropical dry forest species after assisted migration to pine-oak forests at different altitudes:strategic response to climate change

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Journal of Forestry Research 2020年第4期31卷 1215-1223页

作者： Pilar Angélica Gómez-Ruiz cuauhtémoc Sáenz-Romero Roberto Lindig-Cisneros Catedrática CONACYT Centro de Investigaciónde Ciencias Ambientales CICAFacultad de Ciencias NaturalesUniversidad Autónoma del CarmenCiudad del CarmenCampecheMexico Instituto de Investigaciones Agropecuarias y Forestales Universidad Michoacana de San Nicolás de Hidalgo(IIAFUMSNH)MoreliaMexico Instituto de Investigaciones en Ecosistemas y Sustentabilidad(IIES) Universidad Nacional Autónoma de MéxicoCampus MoreliaMoreliaMexico

Assisted migration has been proposed as a strategy for adaptive management of forest species in response to expected effects of climate change,but it is controversial for several *** dry forests are among the most threatened ecosystems in the *** Mexico,historically,land-use change and deforestation have been decreasing forest cover,and climate change is shifting the potential distribution of different forest types,exacerbating the risk of local *** altitudinal migration could be a feasible strategy for reducing local extinctions in response to climate change and lack of landscape *** objective was to evaluate survival and growth of Albizia plurijuga and Ceiba aesculifolia,two tropical deciduous forests species in *** transplanted 4-month-old seedlings to experimental raised beds at three altitudes(2100,2400 and 2700 m a.s.l.),exceeding their upper regional limit of distribution(2000 m a.s.l.).We also tested seed germination at each *** monitored the experiment for 10 *** both species,as altitude increased and cold weather was more prevalent,plant performance *** species,differences in individual growth were significant among *** survival was 18.5%for *** and 24.5%for *** species had higher survival and better growth at lower altitude,and no seedling emergence at any *** conclude that assisted migration can be implemented for each species by an upward attitudinal shift within,and not exceeding,400 m beyond their present upper altitudinal limit of *** results indicate that for many species that show altitudinal gradients at regional scales,unless current climate conditions change,the potential to establish outside their range is minimal.

关键词： Albizia plurijuga Ceiba aesculifolia Climate change Fabaceae Forest management Mitigation strategy Range expansion

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Polygeneration Study of Low-to-Medium Enthalpy Geothermal Reservoirs in Mexico

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Journal of Thermal Science 2021年第3期30卷 1077-1087页

作者： chÁvez Oscar GODÍNEZ Francisco Tecnológico Nacional de México/I.T.chihuahua.Av.Tecnológico 2909 C.P.31310ChihuahuaChihuahuaMéxico Instituto de Ingeniería Universidad Nacional Autónoma de MéxicoUNAMC.U.Ciudad de MéxicoC.P.04510México Polo Universitario de Tecnología Avanzada Universidad Nacional Autónoma de MéxicoVía de la Innovación No.410Autopista Monterrey-Aeropuertokm.10 PIITC.P.66629Apodaca Nuevo LeónMéxico

This study combines the thermodynamic analysis of a polygeneration system along with the numerical modelling of the thermal behavior of geothermal reservoirs in Mexico to exploit their *** reservoir was modeled as a porous medium assuming a five-spot well configuration and local thermal *** heat conduction-convection along with the Laplace equations were solved to compute temperature distributions,the useful life and the optimum distance between injection-extraction *** predicted temperature and pressure of the geothermal fluid at the outlet of the reservoir were exploited in the polygeneration system consisting of:(1)a Rankine cycle,(2)an absorption refrigeration cycle,and(3)a heat *** developed approach allows calculating both the optimal distance between injection-extraction wells and the global(utilization)efficiency of six arrangements(each composed by a reservoir connected to a polygeneration system)by assuming that reservoirs have a lifespan of 30 *** also show that:(a)due to the low efficiency of the Rankine cycle,very little thermal energy is converted into electrical one;(b)not only the temperature and the size are important when evaluating the power production performance of reservoirs,but also the permeability plays a fundamental role;(c)the first law efficiency of the polygeneration system ranges from 41.9%to 43.7%;(d)the utilization efficiency of the six arrangements lies in the range between 25.8%and 31%.

关键词： polygeneration system geothermal reservoir local thermal equilibrium low-to-medium enthalpy

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Cell Death Mechanisms Induced by Cytotoxic Lymphocytes

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Cellular & Molecular Immunology 2009年第1期6卷 15-25页

作者： chávez-Galán L Arenas-Del Angel MC Zenteno E chávez R Lascurain R Departamento de Bioquímica Instituto Nacional de Enfermedades Respiratorias "Ismael Cosío Villegas" Departamento de Bioquímica Facultad de MedicinaUniversidad Nacional Autónoma de México

One of the functions of the immune system is to recognize and destroy abnormal or infected cells to maintain homeostasis. This is accomplished by cytotoxic lymphocytes. Cytotoxicity is a highly organized multifactor process. Here, we reviewed the apoptosis pathways induced by the two main cytotoxic lymphocyte subsets, natural killer （NK） cells and CD8^＋T cells. In base to recent experimental evidence, we reviewed NK receptors involved in recognition of target-cell, as well as lytic molecules such as perforin, granzymes-A and -B, and granulysin. In addition, we reviewed the Fas-FasL intercellular linkage mediated pathway, and briefly the cross-linking of tumor necrosis factor （TNF） and TNF receptor pathway. We discussed three models of possible molecular interaction between lytic molecules from effector cytotoxic cells and target-cell membrane to induction of apoptosis. Cellular ＆ Molecular Immunology.

关键词： apoptosis cytotoxic cell granule-dependent exocytosis FasL TNF

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Tolerance of chrysantemum maximum to heavy metals:The potential for its use in the revegetation of tailings heaps

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Journal of Environmental Sciences 2013年第2期25卷 367-375页

作者： Ma.del Carmen A.Gonzlez-chvez Rogelio Carrillo-Gonzlez Colegio de Postgraduados Programa de EdafologíaCarr.Mxico-Texcocokm 36.5MontecilloTexcoco estado de Mxico 56230Mxico

To find if ornamental plants are applicable to the remediation of metal-polluted areas, the tolerance of chrysanthemum plants （chysanthemum maximum） var. Shasta to different metals under hydroponic conditions was studied. Their responses as influenced by the mycorrhizal fungus Glomus mosseae （Nicol. ＆ Gerd.） Gerdemann ＆ Trappe BEG25 on substrates containing mine residues were also investigated. Our results showed that chrysanthemum is a metal-tolerant plant under hydroponic conditions, plants behaving as Pb-excluders, whereas Cd, Cu and Ni were accumulated in roots. Low accumulation in flowers was observed for Cd and Cu but it was concentration-dependent. Ni and Pb were not translocated to flowers. Shoot biomass was not significantly affected by the different rates of mine residue addition for both mycorrhizal and non-mycorrhizal plants. Mycorrhizal plants accumulated less Pb and Cu in both shoots and roots than non-mycorrhizal plants. chysanthemum could be a prospective plant for revegetation of tailings and the use of inoculation may decrease plant metal accumulation in polluted soils.

关键词： mine residues ornamental plants phytostabilization urban remediation

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Assessment of metabolic flexibility by measuring maximal fat oxidation during submaximal intensity exercise:Can we improve the analytical procedures?

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Sports Medicine and Health Science 2023年第2期5卷 156-158页

作者： Isaac A.chávez-Guevara Department of chemical Sciences Biomedical Sciences InstituteAutonomous University of Ciudad JuarezChihuahuaMexico

Assessment of maximal fat oxidation rate(MFO)during a submaximal exercise test has been employed by many studies to investigate the differences in metabolic flexibility(MetFlex)across several ***,many incorrect assumptions and methodological limitations exist in the procedures employed by previous studies,which might lead to misinterpretation of the reported *** the data retrieved from 19 trained men(Age:[27±4]years;%Body fat:[16.4±4.5]%;maximal oxygen consumption:[55.8±5.3]mL·kg^(−1)·min^(−1))who performed a graded exercise test over a motor-driven treadmill,this opinion paper shows that MFO alone does not perfectly capture the MetFlex in response to submaximal intensity exercise and recommend a novel index that considers both fat oxidation and energy expenditure modifications for an accurate examination of MetFlex.

关键词： Energy metabolism Exercise test Indirect calorimetry Methods

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Structural and optical properties of CZTS nanoparticles prepared by a colloidal process

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Rare Metals 2021年第9期40卷 2602-2609页

作者： R.Aruna-Devi M.Latha S.Velumani JoséÁlvaro chávez-Carvayar Program on Nanoscience and Nanotechnology CINVESTAV-IPNSan Pedro Zacatenco07360 Mexico CityMexico CIICAp-UAEM Av.Universidad 1001.Col.Chamilpa62209 CuernavacaMorelosMexico Department of Electrical Engineering(SEES) CINVESTAV-IPNSan Pedro Zacatenco07360 Mexico CityMexico Instituto de Investigaciones en Materiales UNAM04510 Mexico CityMexico

This research presents the influence of copper(Cu) concentration on the properties of copper zinc tin sulfide(CZTS) nanoparticles(NPs) synthesized by a colloidal method, employing oleylamine as an organic solvent. From the structural analysis, a pure phase of CZTS was obtained at an optimized molar ratio of 1.8:1.1:1:4,and secondary phases were observed as the Cu concentration increased. The increment of the NPs size from 15 to50 nm was noticed as a function of Cu ***, the optical bandgap energy was tuned from1.35 to 1.68 eV with respect to Cu concentration. The sample synthesized at the molar ratio of 1.8:1.1:1:4 showed a pure phase CZTS with desired elemental composition and bandgap. Furthermore, CZTS thin films were prepared by a doctor-blade method using synthesized NPs followed by annealing under a sulfur/nitrogen atmosphere. The annealed CZTS film showed a significant improvement in the morphological, electrical and optoelectronic ***, the annealed CZTS film can be efficiently used as an absorber layer in low-cost thin film solar cells.

关键词： CZTS Copper concentration Nanoparticles Thin film Annealing

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Improvement in estimation of soil water deficit by integrating airborne imagery data into a soil water balance model

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 37-46页

作者： Huihui Zhang Ming Han José L.chávez Yubin Lan Water Management and Systems Research Unit USDA-ARS2150 Centre AvenueBldg.D.Fort CollinsCO80526USA Department of Civil and Environmental Engineering Colorado State UniversityCampus Delivery 1372Fort CollinsCO80523USA College of Engineering South China Agricultural University/Engineering Research Center for Agricultural Aviation Application(ERCAAA)Guangzhou 510642China

In this study,an approach that integrates airborne imagery data as inputs was used to improve the estimation of soil water deficit(SWD)for maize and sunflower grown under full and deficit irrigation *** proposed model was applied to optimize the maximum total available soil water(TAWr)by minimizing the difference between a water stress coefficient ks and crop water stress index(1-CWSI).The optimal value of maximum TAWr was then used to calibrate a soil water balance model which in turn updated the estimation of soil water *** estimates of SWD in the soil profile of both irrigated maize and sunflower fields were evaluated with the crop root zone SWD derived from neutron probe measurements and the FAO-56 SWD *** results indicated a good agreement between the estimated SWD from the proposed approach and measured SWD for both maize and *** statistical analyses indicated that the maximum TAWr estimated from CWSI significantly improved the estimates of SWD,which reduced the mean absolute error(MAE)and root mean square error(RMSE)by 40%and 44%for maize and 22%for sunflower,compared with the FAO-56 *** proposed procedure works better for crops under deficit irrigation *** the availability of higher spatial and temporal resolution airborne imagery during the growing season,the optimization procedure can be further improved.

关键词： soil water deficit soil water balance model airborne imagery total available water CWSI deficit irrigation

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Phytochemical Composition, Anti-Inflammatory and Cytotoxic Activities of chloroform Extract of <i>Senna crotalarioides</i>Kunth

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American Journal of Plant Sciences 2021年第6期12卷 887-900页

作者： Roberto Serrano-Vega Salud Pérez-Gutiérrez Francisco Alarcón-Aguilar Julio Almanza-Pérez cuauhtémoc Pérez-González Marco Martín González-chávez Departamento de Sistemas Biológicos Universidad Autónoma Metropolitana-Xochimilco Mexico City México Departamento de Ciencias de la Salud Universidad Autónoma Metropolitana-Iztapalapa Mexico City México Facultad de Ciencias Químicas Centro de Investigación y Estudios de Posgrado Universidad Autónoma de San Luis Potosí Zona Universitaria San Luis Potosí México

Senna crotalarioides is used in traditional medicine to treat inflammation. The aim of this work was to investigate the anti-inflammatory and cytotoxic activities and the possible mechanism of action of the chloroform extract washed with hexane of S. crotalarioides (CESC). The anti-inflammatory effect was tested on 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced ear edema in mice. The levels of TNF-α, IL-1β, IL-6 and IL-10 were determined in macrophages J774A.1 stimulated by lipopolysaccharide (LPS). The cytotoxic activity was evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay against six human cancer cell lines: HeLa (cervical cancer), SKLU-1 and A549 (lung cancer), LNCaP (prostate cancer), SW620 (colon cancer) and MCF7 (breast cancer). The composition of the CESC was determined by GC-MS analysis, and standardized by HPLC-ELSD with ursolic acid as the phytochemical marker. CESC inhibited ear edema 61.45%. In chronic ear edema, CESC diminished the inflammation by 53.77%. CESC decreased TNF-α, IL-1β and IL-6 concentrations, and increased the concentration of IL-10. The extract showed IC50 values on HeLa, SKLU-1, A549, LNCaP, SW620 and MCF7 b

关键词： Senna crotalarioides Anti-Inflammatory Ursolic Acid Composition Cytotoxic

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