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Grazing Pressure and Plant Functional Types in Puna Highlands,Northwestern Argentina

Phyton-International Journal of Experimental Botany 2024年第5期93卷 1067-1080页

作者： Quiroga mendiola mariana Tálamo Andrés IPAF NOA—INTA(National Institute for Agricultural Technology) Posta de HornillosJujuy4622Argentina Facultad de Ciencias Naturales Universidad Nacional de SaltaSalta4400Argentina Instituto de Bio y Geociencias del NOA(IBIGEO) UNSa-CONICET.Laboratorio de Ecología Aplicada a la Conservación(LEAC)Facultad de Ciencias NaturalesUniversidad Nacional de SaltaSalta4400Argentina maestría en Gestión Ambiental Escuela de NegociosUniversidad Católica de Salta(UCASAL)Salta4400Argentina

The Puna grasslands support grazing systems that produce meat and wool in multi-species herds,especially from llama(Lama glama)and sheep.However,it is yet unknown whether grazing pressure can modify grassland structure and Plant Functional Types diversity and cover in Puna grasslands.We analyzed the relationship between grazing pressure and Plant Functional Types by comparing transects located near stockyards(high grazing pressure)and far from them(low pressure)and by evaluating the relationship between the Plant Functional Types cover to a Grazing Pressure Index(GPI).This index incorporates the heterogeneity of traditional pastoral management.At two ecological sites(Ciénego and Tolar),we sampled paired transects(near-far).Plots near and far from corrals were similar in all the variables measured except for plots in Tolar,which tend to have higher total cover,possibly due to fecal fertilization near stockyards.Furthermore,we recorded an increase in total cover and grass cover at higher GPI in Ciénego,while in Tolar we found lower values of total cover and herbaceous dicotyledonous cover at intermediate intensities of GPI.The only negative relationship found was the cover of clonal and non-clonal shrubs,possibly explained by the greater use of these shrubs as firewood near stockyards.In summary,our study does not show important changes in Plant Functional Types as a function of grazing pressure in the studied grasslands probably because grazing pressure is diluted or diminished when livestock rotates in different areas and grazing durations vary.Finally,the long grazing history with which the Puna has evolved could also contribute to the co-structuration between native vegetation and livestock farming.

关键词： Natural grasslands Puna herbivory ecological perturbation

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Secondary metabolites of Entomopathogenic Fungi, Biological Alternative for the Control of Agricultural Pests and Disease: Present and Perspectives

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Advances in Enzyme Research 2024年第1期12卷 1-15页

作者： Nallely San Juan-maldonado Silvia Rodríguez-Navarro Alejandro Angel-Cuapio José Norberto Vásquez Bonilla Juan Esteban Barranco-Florido departamento de Producció n Agr&#237cola y Animal Universidad Aut&#243noma Metropolitana Unidad Xochimilco Ciudad de M&#233xico M&#233xico Divisió n de Ingenier&#237a Qu&#237mica y Bioqu&#237mica Tecnol&#243gico Nacional de M&#233xico/TES de Ecatepec Ecatepec de Morelos M&#233xico departamento de Sistemas Bioló gicos Universidad Aut&#243noma Metropolitana Unidad Xochimilco Ciudad de M&#233xico M&#233xico

The use of entomopathogenic fungi (EF) in recent years has been highly effective against the different orders of insects considered pests of agricultural importance and their conidia have been commonly applied, but it has been reported that these are sensitive to the environmental conditions. For this reason, biopesticides products have been formulated based on secondary metabolites, recently. These biomolecules participate as biological control agent, such as: cyclic depsipeptides, amino acids, polyketides, polyphenols and terpenoids, affecting their morphology, life cycle and insect behavior. The use of secondary metabolites of entomopathogenic fungi opens the possibility of application in a more efficient way for the control of agricultural pests in a compatible with the environment and human health;therefore, it is important to know, analyzing the type of molecules, their effects, and their different methods of application.

关键词： Secondary metabolites Entomopathogenic Fungi Biological Control Agent

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Impacts of PI3K/protein kinase B pathway activation in reactive astrocytes: from detrimental effects to protective functions

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Neural Regeneration Research 2025年第4期20卷 1031-1041页

作者： Ramón Pérez-Núñez maría Fernanda González Ana maría Avalos Lisette Leyton Cellular Communication Laboratory Programa de Biología Celular y MolecularCenter for Studies on ExerciseMetabolism and Cancer(CEMC)Instituto de Ciencias Biomédicas(ICBM)Facultad de MedicinaUniversidad de ChileSantiagoChile Advanced Center for Chronic Diseases(ACCDiS) Faculty of Chemical and Pharmaceutical Sciences&Faculty of MedicineUniversidad de ChileSantiagoChile Instituto de Ciencias Biomédicas Facultad de Ciencias de la SaludUniversidad Autónoma de ChileSantiagoChile

Astrocytes are the most abundant type of glial cell in the central nervous system.Upon injury and inflammation,astrocytes become reactive and undergo morphological and functional changes.depending on their phenotypic classification as A1 or A2,reactive astrocytes contribute to both neurotoxic and neuroprotective responses,respectively.However,this binary classification does not fully capture the diversity of astrocyte responses observed across different diseases and injuries.Transcriptomic analysis has revealed that reactive astrocytes have a complex landscape of gene expression profiles,which emphasizes the heterogeneous nature of their reactivity.Astrocytes actively participate in regulating central nervous system inflammation by interacting with microglia and other cell types,releasing cytokines,and influencing the immune response.The phosphoinositide 3-kinase(PI3K)/protein kinase B(AKT)signaling pathway is a central player in astrocyte reactivity and impacts various aspects of astrocyte behavior,as evidenced by in silico,in vitro,and in vivo results.In astrocytes,inflammatory cues trigger a cascade of molecular events,where nuclear factor-κB serves as a central mediator of the pro-inflammatory responses.Here,we review the heterogeneity of reactive astrocytes and the molecular mechanisms underlying their activation.We highlight the involvement of various signaling pathways that regulate astrocyte reactivity,including the PI3K/AKT/mammalian target of rapamycin(mTOR),αvβ3 integrin/PI3K/AKT/connexin 43,and Notch/PI3K/AKT pathways.While targeting the inactivation of the PI3K/AKT cellular signaling pathway to control reactive astrocytes and prevent central nervous system damage,evidence suggests that activating this pathway could also yield beneficial outcomes.This dual function of the PI3K/AKT pathway underscores its complexity in astrocyte reactivity and brain function modulation.The review emphasizes the importance of employing astrocyte-exclusive models to understand their functions accurately and these models

关键词： inflammation integrins neuroprotective neurotoxic phosphatidylinositol 3-kinase reactive astrocytes signal transduction Thy-1(CD90)

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Impact of payment source, referral site, and place of residence on outcomes after allogeneic transplantation in mexico

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World Journal of Transplantation 2024年第2期14卷 76-87页

作者： Andrés Gómez-de León yesica A López-mora Valeria García-Zárate Ana Varela-Constantino Sergio U Villegas-de Leon Xitlaly J González-Leal Raúl del Toro-mijares Anna C Rodríguez-Zúñiga Juan F Barrios-Ruiz Victor mingura-Ledezma Perla R Colunga-Pedraza Olga G Cantú-Rodríguez César H Gutiérrez-Aguirre Luz Tarín-Arzaga Elías E González-López David Gómez-Almaguer Hematology Service Universidad Autónoma de Nuevo LeónFacultad de Medicina y Hospital Universitario Dr.JoséEleuterio GonzálezMonterrey 64460Nuevo LeónMexico Hemato-logy Service Clínica Gómez AlmaguerMonterrey 64710Nuevo LeónMexico Hematology Service Instituto Tecnológico de Estudios Superiores de MonterreyTec SaludEscuela de Medicina Ignacio SantosMonterrey 64710Nuevo LeónMexico

BACKGROUND The impact of social determinants of health in allogeneic transplant recipients in low-and middle-income countries is poorly described.This observational study analyzes the impact of place of residence,referring institution,and transplant cost coverage(out-of-pocket vs government-funded vs private insurance)on outcomes after allogeneic hematopoietic stem cell transplantation(alloHSCT)in two of mexico's largest public and private institutions.AIm To evaluate the impact of social determinants of health and their relationship with outcomes among allogeneic transplant recipients in mexico.mETHODS In this retrospective cohort study,we included adolescents and adults≥16 years who received a matched sibling or haploidentical transplant from 2015-2022.Participants were selected without regard to their diagnosis and were sourced from both a private clinic and a public University Hospital in mexico.Three payment groups were compared:Out-of-pocket(OOP),private insurance,and a federal Universal healthcare program“Seguro Popular”.Outcomes were compared between referred and institution-diagnosed patients,and between residents of Nuevo Leon and out-of-state.Primary outcomes included overall survival(OS),categorized by residence,referral,and payment source.Secondary outcomes encompassed early mortality,event-free-survival,graft-versus-host-relapse-free survival,and non-relapse-mortality(NRm).Statistical analyses employed appropriate tests,Kaplan-meier method,and Cox proportional hazard regression modeling.Statistical software included SPSS and R with tidycmprsk library.RESULTS Our primary outcome was overall survival.We included 287 patients,n=164 who lived out of state(57.1%),and n=129 referred from another institution(44.9%).The most frequent payment source was OOP(n=139,48.4%),followed by private insurance(n=75,26.1%)and universal coverage(n=73,25.4%).No differences in OS,event-free-survival,NRm,or graft-versus-host-relapse-free survival were observed for patients diagnosed locally vs in another institution,nor pat

关键词： Hematopoietic cell transplant Social determinants of health Geography Haploidentical Out-of-pocket Financial toxicity Survival Health services and outcomes Hematopoietic malignancy Aplastic anemia

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A new look at the first dinosaur discovered in Antarctica:reappraisal of Antarctopelta oliveroi(Ankylosauria:Parankylosauria)

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Advances in Polar Science 2024年第1期35卷 78-107页

作者： Sergio SOTO ACUÑA Alexander OVARGAS Jonatan KALUZA Red Paleontológica U-Chile Departamento de BiologíaFacultad de CienciasUniversidad de ChileÑuñoa 7800003Chile escuela de Geología Facultad de CienciasIngeniería y TecnologíaUniversidad MayorProvidenciaSantiago 7500994Chile Fundación de Historia Natural Félix de Azara Universidad MaimónidesBuenos Aires C1405Argentina Consejo nacional de Investigaciones Científicas y Técnicas(CONICET) Buenos Aires C1425FQBArgentina

The first dinosaur discovered in the Antarctic continent was the ankylosaur Antarctopelta oliveroi in the 1980s.Nevertheless,since then several hypotheses of phylogenetical relationships have been proposed because these have been depended on how the skeletal remains have been interpreted.The main obstacle for clarifying its phylogenetic position is that many portions of the skeleton remain unknown,in addition to the presence of unknown characters in typical ankylosaurs.Considered an ankylosaurid,nodosaurid,or even a chimaera,a recent proposal based on mostly complete material of a new ankylosaur from Chilean Patagonia provided support for a novel phylogenetic hypothesis:Antarctopelta and other southern ankylosaurs are an early branching clade,the Parankylosauria,whose origin probably dates to the Late Jurassic.In the light of this new view,a redescription of the available skeletal remains is provided together with a new reconstruction of the first Antarctic dinosaur known to the science community.

关键词： Antarctic Peninsula Biogeographic Weddellian Province Parankylosauria Antarctopelta

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Bloom-forming cyanobacteria and dinoflagellates in five Argentinian reservoirs:multi-year sampling

Water Biology and Security

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Water Biology and Security 2024年第1期3卷 28-36页

作者： Florencia Soledad Alvarez Dalinger Borja Claudia Nidia Veronica Laura Lozano Liliana Beatriz morana maría monica Salusso Facultad de Ciencias Naturales Universidad Nacional de SaltaAvenida Bolivia 5150Salta4400Argentina Consejo nacional de Investigaciones Científicas y T'ecnicas(CONICET) Godoy Cruz 2290Ciudad Autonoma de Buenos AiresArgentina

Harmful algal blooms are important threats to reservoir condition.Over a 15-year period,we sampled five Argentinian reservoirs to identify the responsible species for harmful algal blooms and determine the water quality factors driving their occurrence.These reservoirs exhibit diverse morphological and hydrological characteristics and are distributed across varying climatic zones.Cyanobacterial blooms included an array of species,including toxin producers such as Raphidiopsis raciborskii,Aphanizomenon gracile,and microcystis aeruginosa.In contrast,dinoflagellate blooms were predominantly characterized by Ceratium.The cyanobacterial blooms primarily occurred in the shallower reservoirs located in warmer regions,whereas dinoflagellate blooms occurred where temperatures were lower.The most intense blooms occurred during the summer,and although cyanobacterial and chlorophyte blooms co-occurred,they never coexisted with dinoflagellate blooms.We identified cyanotoxins in the reservoirs over the past three years,a phenomenon previously unreported in the region.Given that these reservoirs are drinking water sources for human populations,ongoing and systematic monitoring is needed to protect public health.Controlling the proliferation of algae and cyanobacteria in reservoirs requires resource management at the watershed level,and in the case of the Itiyuro and El Limon,requires binational management with Bolivia.

关键词： HABs Freshwater South America Toxins

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The Effect of Brain Gym on Global Cognitive Function of Institutionalized Older People

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International Journal of mental Health Promotion 2022年第3期24卷 375-383页

作者： Araceli Cano-Estrada Araceli Jimenez-mendoza denny Contreras-Guerrero mario Hernandes-Alejandro Andres Salas-Casas escuela Superior de Tlahuelilpan Universidad Autónoma del Estado de HidalgoTlahuelilpanHidalgoMéxico escuela nacional de enfermería y obstetricia.universidad nacional autónoma de méxico Mexico CityMéxico departomento de Bioingenieria Unidad Profesional Interdisciplinaria de Biotecnología del Instituto Politecnico Nacional(UPIBIIPN)Mexico CityMexico Instituto de Ciencias de la Salud.universidad autónoma del Estado de Hidalgo.Pachuca Hidalgo.México.Scuela Superior de TlahuelilpanUniversidad Autónoma del Estado de HidalgoTlahuelilpanHidalgoMéxico

Cognitive function of older adults is influenced by several factors such as age,sex,education,and physical activity so that it can impact the decrease in progressive cognitive function.It is necessary to implement cognitive training in old people’s care to prevent or delay the onset of age-related cognitive decline.Brain gym is a series of simple motion exercises and is an alternative therapy that stimulates the brain.This study aims to evaluate the effect of brain gym as a cognitive training intervention on global cognitive functioning of institutionalized older population.The study is a non-randomized quasi-experimental one using pre-and post-test control group design.The participants of the study were 65 years old or older who had been part of gerontological centers from a local community.They were divided into two groups:control and intervention,each one with 15 people.mini-mental State Examination was applied to the sample before and after the cognitive training.The brain gym training consists of bi-weekly group meeting for 12 weeks,lasting 50 min each.The treated group had a significantly better global cognitive function.Recalling(memory),orientation and language skills were the domains with the most significant changes(pym improves global cognitive function of institutionalized older people lease type your abstract here.Abstract of a research paper is typically 200 to 400 words in length,and 150 to 300 words for a review paper.Abstract shall be running continuously(not structured)and shall not include reference citations.Abbreviations that appear only once in the abstract should be defined in full.If abbreviations appear more than once,the full definitions should be provided first before they can be used elsewhere.

关键词： Cognitive function brain gymnastic older people gerontological center physical activity

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Host-parasite interactions in perpetual darkness:macroparasite diversity in the cavefish Astyanax mexicanus

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Zoological Research 2023年第4期44卷 782-792页

作者： Ana Santacruz David Hernández-mena Ramses miranda-Gamboa Gerardo Pérez-Ponce de León Claudia Patricia Ornelas-García departamento de Zoología Instituto de BiologíaUniversidad Nacional Autónoma de MéxicoMéxico City CP 04510México departamento de Sistemas y Procesos Naturales Escuela Nacional de Estudios Superiores Unidad MéridaUcúYucatán CP 97357México Instituto de Energías Renovables Universidad Nacional Autónoma de MéxicoTemixcoMorelos CP 62580México Colección nacional de Peces Departamento de ZoologíaInstituto de BiologíaUniversidad Nacional Autónoma de MéxicoMéxico City CP 04510México Stowers Institute for medical Research Kansas CityMO 64110USA

Astyanax mexicanus has repeatedly colonized cave environments,displaying evolutionary parallelisms in many troglobitic traits.despite being a model system for the study of adaptation to life in perpetual darkness,the parasites that infect cavefish are practically unknown.In this study,we investigated the macroparasite communities in 18 cavefish populations from independent lineages and compared them with the parasite diversity found in their sister surface fish populations,with the aim of better understanding the role that parasites play in the colonization of new environments.Within the cavefish populations,we identified 13 parasite taxa,including a subset of 10 of the 27 parasite taxa known for the surface populations.Parasites infecting the cavefish belong to five taxonomic groups,including trematodes,monogeneans,nematodes,copepods,and acari.monogeneans are the most dominant group,found in 14 caves.The macroparasites include species with direct life cycles and trophic transmission,including invasive species.Surprisingly,paired comparisons indicate higher parasite richness in the cavefish than in the surface fish.Spatial variation in parasite composition across the caves suggests historical and geographical contingencies in the host-parasite colonization process and potential evolution of local adaptations.This base-line data on parasite diversity in cavefish populations of A.mexicanus provides a foundation to explore the role of divergent parasite infections under contrasting ecological pressures(cave vs.surface environments)in the evolution of cave adaptive traits.

关键词： Adaptation metazoan parasites Niche change Parasite assemblage Prevalence

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Prenatal programing of motivated behaviors:can innate immunity prime behavior?

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Neural Regeneration Research 2023年第2期18卷 280-283页

作者： Larisa montalvo-martínez Gabriela Cruz-Carrillo Roger maldonado-Ruiz Luis ATrujillo-Villarreal Eduardo AGarza-Villarreal Alberto Camacho-morales universidad autónoma de Nuevo León Department of BiochemistryCollege of MedicineMonterreyMéxico universidad autónoma de Nuevo León Neurometabolism UnitCenter for Research and Development in Health SciencesMonterreyMéxico universidad nacional autónoma de méxico Campus Juriquilla Instituto de NeurobiologíaQueretaroMéxico

Prenatal programming during pregnancy sets physiological outcomes in the offspring by integrating external or internal stimuli.Accordingly,pregnancy is an important stage of physiological adaptations to the environment where the fetus becomes exposed and adapted to the maternal milieu.maternal exposure to high-energy dense diets can affect motivated behavior in the offs p ring leading to addiction and impaired sociability.A high-energy dense exposure also increases the pro-inflammatory cytokines profile in plasma and brain and favors microglia activation in the offspring.While still under investigation,prenatal exposure to high-energy dense diets promotes structural abnormalities in selective brain regions regulating motivation and social behavior in the offspring.The current review addresses the role of energy-dense foods programming central and peripheral inflammatory profiles during embryonic development and its effect on motivated behavior in the offspring.We provide preclinical and clinical evidence that supports the contribution of prenatal programming in shaping immune profiles that favor structural and brain circuit disruption leading to aberrant motivated behaviors after birth.We hope this minireview encourages future research on novel insights into the mechanisms underlying maternal programming of motivated behavior by central immune networks.

关键词： addiction autism behavior cytokines diet maternal immune activation prenatal programming sociability trained immunity western-diets

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Cerebral dopamine neurotrophic factor transfection in dopamine neurons using neurotensin-polyplex nanoparticles reverses 6-hydroxydopamine-induced nigrostriatal neurodegeneration

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Neural Regeneration Research 2022年第4期17卷 854-866页

作者： manuel A.Fernandez-Parrilla David Reyes-Corona yazmin m.Flores-martinez Rasajna Nadella michael J.Bannon Lourdes Escobedo minerva maldonado-Berny Jaime Santoyo-Salazar Luis O.Soto-Rojas Claudia Luna-Herrera Jose Ayala-Davila Juan A.Gonzalez-Barrios Gonzalo Flores maria E.Gutierrez-Castillo Armando JEspadas-Alvarez Irma A.martínez-Dávila Porfirio Nava Daniel martinez-Fong departamento de Fisiología Biofísica y NeurocienciasCentro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico Programa Institucional de Biomedicina molecular Escuela Nacional de Medicina y HomeopatíaInstituto Politécnico NacionalCiudad de MéxicoMéxico department of Biosciences IIIT-SrikakulamRajiv Gandhi University of Knowledge Technologies(RGUKT)Andhra PradeshIndia department of Pharmacology Wayne State University School of MedicineDetroitMIUSA departamento de Física Centro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico Facultad de Estudios Superiores Iztacala Universidad Nacional Autónoma de MéxicoTlalnepantla de BazEdo.de MéxicoMéxico departamento de Fisiología Escuela Nacional de Ciencias BiológicasCiudad de MéxicoMéxico Laboratorio de medicina Genómica Hospital Regional“1°de Octubre”ISSSTECiudad de MéxicoMéxico Laboratorio de Neuropsiquiatría Instituto de FisiologíaBenemérita Universidad Autónoma de PueblaPueblaPueblaMéxico departamento de Biociencias e Ingeniería Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y DesarrolloInstituto Politécnico NacionalCiudad de MéxicoMéxico Programa de Nanociencias y nanotecnología Centro de Investigación y de Estudios AvanzadosCiudad de MéxicoMéxico

Overexpression of neurotrophic factors in nigral dopamine neurons is a promising approach to reverse neurodegeneration of the nigrostriatal dopamine system,a hallmark in Parkinson's disease.The human cerebral dopamine neurotrophic factor(h CDNF)has recently emerged as a strong candidate for Parkinson's disease therapy.This study shows that h CDNF expression in dopamine neurons using the neurotensinpolyplex nanoparticle system reverses 6-hydroxydopamine-induced morphological,biochemical,and behavioral alterations.Three independent electron microscopy techniques showed that the neurotensin-polyplex nanoparticles containing the h CDNF gene,ranging in size from 20 to 150 nm,enabled the expression of a secretable h CDNF in vitro.Their injection in the substantia nigra compacta on day 21 after the 6-hydroxydopamine lesion resulted in detectable h CDNF in dopamine neurons,whose levels remained constant throughout the study in the substantia nigra compacta and striatum.Compared with the lesioned group,tyrosine hydroxylase-positive(TH^(+))nigral cell population and TH+fiber density rose in the substantia nigra compacta and striatum after h CDNF transfection.An increase inβIII-tubulin and growth-associated protein 43 phospho-S41(GAP43 p)followed TH^(+)cell recovery,as well as dopamine and its catabolite levels.Partial reversal(80%)of drugactivated circling behavior and full recovery of spontaneous motor and non-motor behavior were achieved.Brain-derived neurotrophic factor recovery in dopamine neurons that also occurred suggests its participation in the neurotrophic effects.These findings support the potential of nanoparticle-mediated h CDNF gene delivery to develop a disease-modifying treatment against Parkinson's disease.The Institutional Animal Care and Use Committee of Centro de Investigación y de Estudios Avanzados approved our experimental procedures for animal use(authorization No.162-15)on June 9,2019.

关键词： axonal growth brain-derived neurotrophic factor gene delivery nanoparticles neuritogenesis neuronal cytoskeleton neuroregeneration neurorestoration neurotrophic therapy Parkinson's disease reinnervation substantia nigra

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