bluuebunny/crossref_metadata_2025 huggingface dataset:
BIOREMEDIATION OF PETROLEUM REFINERY EFFLUENTS USING MUTATED FUNGAL CONSORTIA: A CASE STUDY FROM KADUNA, NIGERIA
Authors: Bala Said Hafsat , Mohammed Sani S. D. , Maiangwa Jonathan , Musa Nomsu
Published: February 2025

Bioremediation is a process of using naturally occurring species to break down hazardous substances into less harmful or non-toxic substances. Effluents from petroleum refinery pose a serious health hazard on the people who depend on the water as source of supply for domestic uses. To avoid health hazard, it is imperative for these toxic compounds to be removed from waste water before its disposal. The primary goal of this study was to carry out bioremediation of petroleum refinery effluents using mutant strains of fungal consortia. Refinery effluents were collected under the storage tank in Kaduna Refining and Petrochemical Company, Kaduna, Nigeria. Effluent samples were analyzed for total petroleum hydrocarbons using Gas Chromatography and Mass Spectroscopy (GC-MS). Standardization of the fungal consortium inoculum was prepared following standard method. The culture medium of each isolate of the mutated fungi Aspergillus niger, A. fumigatus, A. versicolor and A. quadrilineatus was carried out following standard procedure. The result of the GC-MS analysis revealed that cis-13-Octadecenoic acid, methyl ester; 7-Hexadecenoic acid, methyl ester; 10-Octadecenoic acid, and Methyl stearate; showed the highest percentage quality of (99%) respectively. Bioremediation of Kaduna refinery effluents in this study indicated that, there was decline in the bioremediation parameters in the second week up to the fourth week whereby the COD, BOD all showed significant decrease. Based on the Gas Chromatographic (GC) analysis of the fungi consortium, the degradative ability of the mutants of Aspergillus versicolor and Aspergillus quadrilineatus were observed to be prominent.
EFFECTS OF GRADED DILUTED DOSES OF GRAMOXONE HERBICIDE ON PROGESTERONE, TESTOSTERONE, ALBUMIN AND TOTAL PROTEIN OF MALE AND FEMALE ALBINO RATS (Rattus norvegicus)
Authors: Agbeyi Erhomarhua Victor , Oghenerhoro Patrick Suit
Published: February 2025

The use of herbicides no matter how diluted it maybe, may have physiological effects on mammals. This work tends to examine the effects dilution factor of 104 of a 10-fold serial dilution of gramoxon herbicide graded into 0.25, 0.5 and 0.75 mg/kg body weight, orally administered to twenty male and twenty female rats has on progesterone, testosterone, albumin and total protein of the rats. The weights of the rats ranges between 79 -119g and were divided randomly into group A, B, C and D. Each group has 10 animals, 5 male and 5 female. Group A is the control. Group A, B.C and D were fed with feed and water ad libitum. Group B, C and D were administered 0.25, 0.5 and 0.75mg/kg bw dose respectively. After 28 days the rats were sacrificed and blood collected into EDTA bottles for laboratory assessment. Computer based ANOVA excel showed that albumin and total protein revealed a significant difference (p<0.05) in group B (0.25mg/kg bw), C (0.5mg/kg bw) and D (0.75mg/kg bw) in both sex compared with control. Testosterone and progesterone level showed a significant decrease (p<0.05) compared with control in group B, C and D. The results clearly indicated that gramoxon herbicide has biochemical and reproductive effects on albino rats even at 10-fold dilution.
BIOREMEDIATION OF WATER POLLUTANTS FROM WASTEWATER
Authors: Umar Sani Ado , Dhakar Ramgopal , Sa'idu Mubarak , Sulaiman Mustapha , Wudil Aminu Ahmed , Shitu Ahmad Sadi , Abdullahi Abdullahi Rabiu , Saminu Saminu Muhammad , Teli Pankaj Kumar , Aliyu Umar Adamu
Published: February 2025

Environmental pollution caused by xenobiotics and other persistent compounds has been recognized as a significant threat to both human health and the natural environment. These pollutants, which include heavy metals, polychlorinated biphenyls, plastics, and various agrochemicals, are toxic and resistant to biodegradation. Bioremediation is an emerging and effective method for cleaning contaminated environments by removing toxic waste. This technique utilizes a range of microorganisms, both aerobic and anaerobic, to treat polluted sites. Microorganisms are crucial in bioremediation as they degrade, detoxify, and immobilize hazardous wastes and pollutants, transforming them into less toxic forms. Depending on factors like cost, pollutant type, and concentration, bioremediation can be conducted ex-situ or in situ. Consequently, the appropriate bioremediation method is selected based on these factors. This review addresses the major issue of contaminants in water, including its sources, effects on the ecosystem, remediation strategies using different biological processes that change the pollutants into less hazardous, source and types of pollutants, the principle of bioremediation, bioremediation strategies, and technologies, microorganisms in bioremediation, case study and application, monitoring, and assessment of bioremediation process, environmental impacts and sustainability, future perspectives, and challenges.
MECHANICAL AND VISCOELASTIC PROPERTIES OF COCONUT COIR FIBRE REINFORCED HIGH-DENSITY POLYETHYLENE COMPOSITE FOR APPLICATION AS WALL TILE
Authors: Babatunde O. A. , Omale P. E. , Iorver Precious D. , Agbogo U. V.
Published: February 2025

In the effort to clean up the environment and transform plastic waste into valuable resources, the mechanical and thermal properties of a composite made from High- Density Polyethylene (HDPE) and Coconut Coir Fiber (CCF) were examined to determine the optimal blending ratio for producing wall tiles. The Coconut Coir Fiber was treated with 10% w/v sodium hydroxide and mixed with waste HDPE using a roll melt mixing compression molding technique. The study assessed tensile strength, flexural strength, and hardness. While the addition of coconut coir fiber improved the hardness of recycled HDPE, it did not enhance flexural or tensile strengths. The viscoelastic properties, evaluated using a 242E dynamic mechanical analyzer over a temperature range of 30°C to 130°C at frequencies of 2 Hz, 5 Hz, and 10 Hz, revealed that the composite exhibited better thermal stability at higher temperatures than waste HDPE.
PERFORMANCE OF GROUNDNUT (Arachis hypogaea L.) VARIETIES AS INFLUENCED BY PHOSPHORUS AND MULCHING IN THE NIGERIA SAVANNA
Authors: Shamsuddeen Ladan , Bashir Aminu Abdullahi
Published: February 2025

The study on groundnut (Arachis hypogaea L.) performance under different rates of phosphorus and mulching in the Nigeria savannas addresses challenges of low soil fertility and harsh climatic conditions. Groundnut, an important crop in Nigeria, is limited by phosphorus deficiency and soil moisture stress in the savannas. Phosphorus is vital for root development, flowering, and seed production but is often deficient in the region’s alkaline soils. Mulching helps conserve moisture, reduce erosion, and improve fertility by adding organic matter. Identifying optimal combinations of phosphorus and mulching can enhance groundnut yield and sustainability. Field trials were conducted at the Irrigation Research Farms of the Institute for Agricultural Research, Samaru and Kadawa in dry season of 2024 to evaluate two varieties of groundnut (SAMNUT-24 and SAMNUT-25), three phosphorus rates 0, 30 and 60 kgP205ha-1), and three mulch materials (no mulch, polythene sheet and rice straw). Treatments were laid out in a randomized complete block design with three replications. Results showed SAMNUT-24 excelled in branches, canopy spread and shoots dry weight, while SAMNUT-25 produced higher pod yield and harvest index. Applying 60 kgP205 ha-1 improved leaves, pod yield and harvest index, while polythene sheets enhanced leaf number and canopy spread. Both varieties performed well under irrigation. SAMNUT-24 and SAMNUT-25 with 60 kgP2O5ha-1 and rice straw mulch is recommended for farmers. Further research is needed to explore phosphorus rates with new/improved varieties.
ASSESSMENT OF HEAVY METALS ACCUMULATION AND ASSOCIATED HEALTH RISKS ON MORINGA OLEIFERA FROM SOUTHERN KADUNA, NIGERIA
Authors: Yawuck Esther B. , Allems G. A.
Published: February 2025

Consuming medicinal herbs like Moringa oleifera that contains high levels of heavy metals can lead to major health issues. Moringa oleifera leaves obtained from Ambam (Jama'a LGA) and Maro (Kajuru LGA) in Kaduna State, Nigeria, were subjected to an AAS analysis to determine the content of heavy metals and associated health risk. Fe 7.627 mg/kg Pb 0.598 mg/kg, Ni 0.454 mg/kg, Mn 0.451 mg/kg, Zn 0.333 mg/kg, Cu 0.286 mg/kg, Cr 0.191 mg/kg were the order of metal concentrations in Moringa oleifera from Ambam. Maro metal concentrations trend follows a different order: Cd has the lowest concentration at 0.035 mg/kg, followed by Fe 3.453 mg/kg, Mn 0.601 mg/kg, Pb 0.505 mg/kg, Ni 0.327 mg/kg, Zn 0.262 mg/kg, Cu 0.221 mg/kg, and Cr 0.155 mg/kg. Ambam and Maro have Cd, Ni, and Mn concentrations below the WHO recommended acceptable range of 0.1 to 5.00 mg/kg. While Pb is over the WHO established permitted limit of 0.3mg/kg, the concentration of Cr in both Ambam and Maro was found to be within the limit of 0.2 to 2.0.3mg/kg. Consuming Moringa oleifera from this area may pose risk of cancer because the THQ values of Cd, Cu, Fe, Ni, and Pb were found to be greater than 1. The consumption of Moringa oleifera from the study regions may have a negative impact on the health of adult consumers, as indicated by the health index (HI) values of 43.7222 and 35.2028 at Ambam and Maro, respectively.
STUDY OF THE THERMO-PHYSICAL PROPERTIES OF POLYPROPYLENE/GRANITE PARTICULATES COMPOSITES AS DENTAL IMPLANTS
Authors: Abdulwahab M. , Mojisola T. , Lawal H. A.
Published: February 2025

This study focuses on the development of a composite material for potential dental applications by investigating the influence of granite particulate (GTP) loading on the physical properties of polypropylene (PP) matrix. This was achieved by washing the granite in distilled water, followed by drying and then ball milling for 72 hours. Subsequently, the powdered granite was combined with polypropylene (PP) in a two-roll mill compounder at a temperature of 150°C for 5 minutes. Five distinct samples with varying GTP percentages ranging from 10% to 50 wt. % were produced. The samples were thereafter subjected to testing for various physical properties such as density, thermal conductivity and diffusivity, specific heat capacity etc. Standard analytical techniques such as DSC and TGA were employed to analyze the sample. It was observed from the obtained results that sample containing 50 wt. % PP/GTP demonstrates enhanced properties of such as thermal degradation resistance of 75.23 % as compared to 94 % weight loss of the other tested weight ratios, thereby making it a choice candidate for potential applications in dentistry.
Presentación
Authors: Marín Leyva René Augusto
Published: February 2025

Presentación
SELECCIÓN E INVERSIÓN DEL CAPITAL HUMANO EN LA INCERTIDUMBRE
Authors: González Santoyo Federico , Chávez Rivera Rubén , Flores Romero Beatriz
Published: February 2025

En este trabajo se presenta la selección de candidatos a través de método de distancia de Minkowski en lógica multivalente, y por otra parte a través del modelo de Davenport se evalúa la inversión de capital humano, pero mediante tripleta de confianza. De modo que al separar las características de acuerdo las capacidad, el comportamiento y esfuerzo principalmente se garantice que las decisiones tomadas al seleccionar al candidato para ocupar un puesto sean las apropiadas y correctas.
MIGRACIÓN DE RETORNO E INVERSIÓN EN MÉXICO. EL CASO DE LOS MIGRANTES DE SEGUNDA GENERACIÓN
Authors: Barbosa muñoz Perla Araceli , Aguirre Ochoa Jerjes Izcóatl
Published: February 2025

El presente artículo tiene como propósito analizar las características de la migración de retorno, identificando dentro de su tipología aquellos casos en que se puede ubicar a los migrantes de segunda generación dentro del contexto de un retorno transgeneracional, así como los esquemas a partir de los cuales esta población pudiera interesarse en realizar inversiones en el país, para el impulso al crecimiento económico y desarrollo en las loca­lidades de origen.
IDENTIFICACION DE LAS VARIABLES BASICAS DE LOS PROGRAMAS DE SALIDA PARA POTENCIALES JUBILADOS (AGIND AND RETIREMENT) EN EMPRESAS DE LA REGIÓN CENTRO DEL ESTADO DE COAHUILA, MÉXICO, EN LA GES- TION DE RECURSOS HUMANOS.
Authors: González Guajardo Jesús Emilio , Zúñiga Cortez Juan Hermilo , Gutiérrez González Leonor , Rivera Martínez Susy , García Ruiz Olvido Elizabeth
Published: February 2025

Existen modelos de Gestión de Recursos Humanos (GRH) que identifican elementos similares en sus contenidos, sin embargo, se observa en ellos la ausencia de Programas de Preparación de Salida para potenciales jubilados (PSPJ). El estudio tiene como objetivo identificar las variables básicas por incluir en éstos. Metodología: revisión documental de modelos GRH, referencias de conductas en trabajadores, previas y posteriores a la sali­da de las organizaciones y normatividad mexicana. Se utiliza herramienta CEOMA desarrollada por el Grupo Investigación Envejecimiento (GIE) Universidad de Barcelona, España con adecuaciones validadas por grupo de expertos internos y externos (ONGs regionales); Muestra seleccionada de 81 jubilados con un nivel de confianza del 95%, aplicando a la fecha 26 encuestas; El registro de datos se hace mediante Excel y los resulta­dos parciales son: población sobresaliente Monclova, género masculino, casados, educación primaria, empleados, pocos trabajan actualmente, pro­medio 11 años jubilados la mayoría anticipadamente, sin preparación de salida, peor calidad de vida en relaciones sociales, familiares, mental, física y económicamente, visitan al médico y se medican, consideran que las empresas deben desarrollar PSPJ identificado principalmente las áreas de salud física, mental y relaciones familiares, sin olvidar lo económico. Estos resultados son fundamento para la elaboración de un PSPJ.
ANÁLISIS DE HABILIDADES GERENCIALES DE EMPRESARIOS ASIÁTICOS, QUE EMPEZARON COMO MICROEMPRESAS Y LOGRARON CRECER A EMPRESAS DE CLASE MUNDIAL
Authors: Torres Hernández Zacarías , Chavarría López Leticia Refugio , Flores Galaviz José Luis
Published: February 2025

La presente investigación se realizó para analizar los perfiles de algunos emprendedores asiáticos, que iniciaron con microempresas y las transfor­maron en empresas de clase mundial, a fin de identificar los elementos comunes como habilidades, actitudes, valores, nivel educativo y cultural que les permitieron convertirse en empresarios de éxito.
DECISIONES EN LA EMPRESA EN AMBIENTE DE RIESGO, EN LA CERTEZA E INCERTIDUMBRE (FUZZY LOGIC).
Authors: González Santoyo Federico , Flores Romero Beatriz
Published: February 2025

En el presente trabajo se propone una metodología alterna a la existente en la literatura especializada, para hacer evaluación del riesgo financiero en la certeza e incertidumbre, criterio que apoya la toma de decisiones empresa­riales de forma eficiente y eficaz.
LAS TECNOLOGÍAS DE INFORMACIÓN Y COMUNICACIÓN: SU EVOLUCIÓN Y APLICACIÓN EN LOS NEGOCIOS INTERNACIONALES
Authors: Molina Martínez Rubén , Gallardo Jacobo Jorge Luis
Published: February 2025

En este trabajo se observa la evolución de las capacidades de las Tecnologíasde Información y Comunicación (TIC) de una tecnología de acceso fijoa una móvil, que pueden ser aplicadas con especial atención a quienesestán inmersos en el ambiente de los negocios internacionales (NI), a finde mejorar la toma de decisiones en la actual globalización de la economíabasada en el conocimiento.Se contemplan indicadores de distintas compañías a nivel global conlas tendencias de movilidad tecnológica, tanto en los dispositivos de accesosmóviles, sistemas operativos y aplicaciones que promueven un nuevomodelo de negocio, en una carretera de información en crecimiento.
EFECTIVIDAD, RENDIMIENTO Y DESEMPEÑO DEL SISTEMA DE PENSIONES DE MÉXICO: ESTUDIO COMPARATIVO DE LAS EMPRESAS OFERENTES (AFORE)
Authors: Fajer Herrera Miguel , Ortiz Paniagua Carlos Francisco
Published: February 2025

El sistema de pensiones en México actualmente es administrado por empresasparticulares, denominadas AFORE. Estas empresas ofertan administrarcon rendimientos la pensión de los trabajadores mexicanos. ¿Cuál es elrendimiento que dichas empresas generan? Siguiendo la metodología deestimación de rendimientos del sistema oficial y descontando la inflación,en México los rendimientos son inferiores a cualquier otro instrumentofinanciero en promedio. A la vez la administración de los fondos hatenido demuestra que se tienen pérdidas, no reconocidas por las AFOREy denominadas “minusvalías”. En el presente se demuestra que mientrasse opera con pérdidas en el sistema de pensiones, las empresas operan conganancias para ellas mismas, sin que se cuente con un marco regulatoriopara la protección del ahorro de los trabajadores. Se pone en evidenciaque se trata de un sistema de pensiones “en riesgo” que no garantizasostenibilidad ni rendimientos mínimos para los trabajadores depositarios.
LA INNOVACIÓN DE LA PEQUEÑA EMPRESA MEXICANA Y SUS CONFLICTOS RESPECTO DE LA GLOBALIZACIÓN
Authors: Chávez Chávez José Luis , Gordillo Ojeda Raquel
Published: February 2025

El entorno actual de los negocios internacionales caracterizadoprincipalmente por el fenómeno de la globalización, el cual ha traídoconsigo muchos cambios en todos los campos del quehacer humano,una gran interdependencia de los mercados y las naciones, revolucionesde la tecnológicas y de información, creando así un entorno muycompetitivo e incierto para las PYMES mexicanas en el ámbito de losnegocios internacionales por lo que se deben identificar los retos yoportunidades para éstas en la actualidad. Existen varios retos a los quedeberán enfrentarse las PYMES mexicanas pero sin embargo, se planteacomo principal reto el factor cultural, pues al superarse y mejorarse esteaspecto se podría implantar de una manera más fácil la nueva culturade negocios internacionales, ya que las empresas mexicanas nunca sehan caracterizado por tener una cultura empresarial fuerte, y peor aún,en algunas organizaciones mexicanas pareciera que no cuentan conuna cultura dentro de ellas, situación que limita su participación en losnegocios internacionales, debido a que en la actualidad el aspecto humano,así como el cultural dentro de la organización son los principales factorespara mejorar la competitividad internacional de las empresas mexicanas.
LA ACTIVIDAD AGRÍCOLA EN MÉXICO Y EL MUNDO EN EL MARCO DEL SISTEMA AGROALIMENTARIO MUNDIAL: ENTRE LOS AGRONEGOCIOS Y EL ABASTO DE ALIMENTOS
Authors: García García José Odón
Published: February 2025

El objetivo del presente artículo es el de mostrar que la agricultura mexicanaes en parte resultado de la dinámica mundial alimentaria en una amplialínea temporal por lo que se puede describir la producción agrícola deMéxico y el mundo en el marco del llamado sistema el agroalimentariomundial. Dicho sistema ha experimentado transformaciones radicales yaque las empresas no operan aisladas; quienes dominan la competencia en laproducción y distribución de alimentos son los complejos agroindustrialesque han concurrido con grandes transformaciones hegemónicas, de prácticasproductivas y patrones alimentarios. En este marco la producción brutaagrícola en México y el mundo ha tenido una tendencia creciente aunquesi esto lo dividimos entre la población el dinamismo es significativamentemenor. Por otro lado, la tónica del discurso en las diversas descripcionesdel sistema agroalimentario mundial, en cuanto a su objetivo fundamental,se centra en el abasto alimentario, sin embargo se ha venido imponiendo ladinámica del mercado.
POSICIONAMIENTO Y MANIPULACIÓN MEDIÁTICA: APLICACIONES Y ESTRATEGIAS
Authors: Sahui Maldonado José Alonzo , Quijano García Román Alberto , Argüelles Ma Luis Alfredo
Published: February 2025

Una de las principales críticas a la publicidad es que manipula a losconsumidores. La base de este argumento radica en el hecho de que el usode los instrumentos a través de los cuales las empresas nos dan a conocerlos bienes y servicios que elaboran, logra muchas veces, hacer que losconsumidores adquieran productos “que en realidad no necesitan”. En estesentido, en el presente trabajo se analizará el posicionamiento –un conceptoclave de la mercadotecnia actual−, y cómo es aplicado por las empresas. Porotro lado, y con el propósito de fundamentar nuestros argumentos, en loque respecta a la manipulación, utilizamos el modelo de propaganda de losmedios de comunicación de Herman y Chomsky (1990).
LÍNEAS DE INVESTIGACIÓN EN LA CERTIFICACIÓN DE LA GESTIÓN POR COMPETENCIAS
Authors: Guerrero Dávalos Cuauhtémoc , Jiménez López María Luisa
Published: February 2025

Con el surgimiento de la certificación de las “competencias laborales”o “competencia profesional” en el Reino Unido en la década de los 80,los gobiernos de los países más industrializados del planeta adoptaronen sus modelos educativos y laborales la gestión por competencias comoun instrumento estratégico dadas las circunstancias de ventaja que éstasofrecían en el mundo laboral y profesional; y posteriormente se promovieronmúltiples criterios para certificar estas competencias en base a estándaresarbitrariamente diseñados para evaluar a los trabajadores seleccionadospor las organizaciones. Por lo tanto, en este trabajo se profundiza en elsignificado de Competencia o Competencias, además de establecer algunaslíneas de investigación sobre este tema.
POSICIONAMIENTO DE LA EMPRESA USANDO LA PRODUCTIVIDAD COMO ESTRATEGIA
Authors: González Santoyo Federico , Flores Romero Beatriz , Chagolla Farías Mauricio A.
Published: February 2025

En el presente trabajo se hace una propuesta metodológica para el estudio e incremento de la productividad para la empresa, tal que le permita con su implantación y seguimiento un mejor desarrollo y generación de riqueza, así como el incremento de la calidad y competitividad empresarial, tal que la distinga como empresa de y con calidad y la posicione como de clase mundial en el mercado internacional.
PROBLEMÁTICA Y ALTERNATIVAS DE FINANCIAMIENTO PARA LAS MICROS Y PEQUEÑAS EMPRESAS FAMILIARES DE MICHOACÁN: ESTUDIO DE CASO
Authors: Rodríguez Ramírez Anuar Raymundo , Chauca Malásquez Pablo Manuel
Published: February 2025

La literatura especializada resalta la importancia de las empresas fami­liares tanto a nivel re gional como a nivel nacional e internacional. Esta importancia se puede reflejar en el número de empresas, la producción, las ventas, el empleo y los ingresos; pero en muchas ocasiones no se hace visible sobre todo en el caso de las micros y pequeñas empresas (MYPES) familiares. Existen pocas investigaciones enfocadas a las MYPES conside­rando su carácter familiar en especial a nivel estatal y local, y más aún de tipo cuantitativo. En tal sentido, este trabajo analiza la problemática y las alternativas de financiamiento así como las condiciones y factores que las explican en las MYPES familiares a partir de la sistematización de la literatura especializada y de los resultados del trabajo de campo realizado en la región Pátzcuaro-Zirahuén del estado de Michoacán, que permitió constatar las complejidades y particularidades de ese tipo de empresa como unidad económica y como unidad familiar en especial en términos del financiamiento. Las particularidades de las MYPES familiares reseñadas y detectadas permiten resaltar que es importante que en el diseño de políti­cas públicas para su fomento y apoyo, hay que distinguir las generalidades de toda empresa de tamaño micro y pequeño (sobre todo en relación a las de mayores dimensiones), de sus especificidades al interior de las MYPES y de su carácter familiar o no.
SISTEMAS PRODUCTIVOS: ELEMENTOS PARA SU ANÁLISIS DESDE LA PERSPECTIVA DEL DESARROLLO LOCAL
Authors: Soto González Livier Julieta , Chauca Malásquez Pablo Manuel
Published: February 2025

El objetivo central del artículo es caracterizar a los sistemas productivos a partir de los referentes conceptuales de los procesos de desarrollo local. Se exponen las distintas conceptualizaciones de los sistemas productivos, sus diferentes tipologías y cómo pueden utilizarse como unidad de análisis para analizar la dinámica empresarial en los procesos de desarrollo local. Se sostiene que la estrategia de desarrollo local requiere de la participación estratégica de los diversos actores sociales a fin de conformar redes de co­laboración y competencia y fortalecer los procesos de innovación, todo lo cual debe llevar a la mejora del nivel de vida de la población. En los sistemas productivos destacan la organización flexible de la producción; el cambio y difusión de las innovaciones; el desarrollo urbano del territorio; y los cambios y adaptaciones de las instituciones. Todos ellos son procesos relacionados entre sí que ejercen efectos unos sobre otros, que pueden re­forzar y fortalecer los sistemas productivos locales.
ANÁLISIS DE COMPETITIVIDAD Y RENTABILIDAD EN UNA ENGORDA DE TORETES EN DOS SISTEMAS DE ALIMENTACIÓN
Authors: González Pérez José Manuel , Gómez Monge Rodrigo
Published: February 2025

La investigación se realizó en el Municipio de Apatzingán, Michoacán, México, y consistió en evaluar la competitividad y la rentabilidad de la engorda de toretes bajo dos sistemas de alimentación: uno usando un Sistema Tradicional de Confinamiento (STC) con granos y otra con un Sistema Silvopastoril Intensivo (SSPi). Para evaluar la rentabilidad y com-petitividad de los sistemas experimentados se utilizó la Matriz de Análisis de Política (MAP), utilizando precios privados. Los resultados de la in­vestigación aplicada a los dos sistemas (STC y SSPi), encontró que los animales engordados bajo el STC no fueron rentables ni competitivos, mientras que para el SSPi se estimaron ganancias. Como los becerros del SSPi aún no adquirían su peso comercial para venderse a mejor precio, se amplió el tiempo de engorda, para lo cual el SSPi se dividió en dos tipos de explotación: una usando solo el SSPi como única fuente de alimentación y otro utilizando el SSPi con suplemento de pulido de arroz, las que al ser evaluadas se observó que los dos SSPi fueron rentables y competitivos.
Incidencia del TMEC y RCEP en los procesos de integración regional transpacífica: Impacto en México
Authors: González García Juan , Morales Lizárraga Gerardo
Published: February 2025

En este artículo, se realiza un análisis del impacto que tiene para México, su participación en los procesos deintegración económica transpacífica recientes, expresado en sus relaciones económicas, comerciales y deinversión con los principales países que lideran dos de los mayores mega acuerdos comerciales del mundo, elTMEC y el RCEP: Estados Unidos y China. Se encuentra que hay una mayor integración con el TMEC y por endeun mayor impacto en comercio e inversión externos, pero que la integración en el RCEP, no obstante, crecemarginalmente a partir de la entrada en vigor del acuerdo y se presenta como una opción más de integracióntranspacífica de México con esa región.
Ejercicios físicos, equilibrio e inclusión: una experiencia con estudiantes con discapacidad auditiva
Authors: Ermel Caicedo Josué , Uriarte Albán Yadira del Carmen , Maqueira Caraballo Giceya de la Caridad
Published: February 2025

Introducción. La inclusión de estudiantes con discapacidad auditiva en la clase de educación física implica la mejora de su equilibrio y la realización de ejercicios adaptados. Objetivo. Diseñar ejercicios físicos adaptados para compensar los problemas de equilibrio y la mejora de la inclusión de estudiantes con discapacidad auditiva en las clases de educación física. Metodología. En el estudio se empleó un enfoque mixto no experimental, de tipo exploratorio secuencial, de alcance descriptivo. Para su desarrollo se establecieron tres etapas: diagnóstico, diseño y validación, apoyado en métodos teóricos dentro de estos el analítico- sintético, inductivo -deductivo y la modelación, como métodos empíricos se empleó la observación directa, entrevista y la medición, apoyado en técnicas como la guía de observación, la guía de entrevista, la revisión documental y la   escala de equilibrio de Berg. La muestra fue no probabilística seleccionándose de manera intencional como unidad de análisis 11 estudiantes entre 7 y 9 años que presentaban diferentes grados de discapacidad auditiva. Para la validación de la propuesta, se utilizó el criterio de especialista mediante un taller de socialización. Resultados. Quedó evidenciado que los estudiantes con discapacidad auditiva enfrentan desafíos significativos en el proceso de inclusión en la clase de educación física, especialmente en la realización de actividades que requieren equilibrio y coordinación. Los estudios precedentes y opiniones de los especialistas consultados destacan la valía de los ejercicios adaptados en entornos diversos (agua, superficies inestables y tierra firme), señalando que pueden ser eficaces para mejorar el equilibrio, aspecto crítico para su inclusión activa en las clases. Conclusiones. Los ejercicios físicos adaptados contribuyen a la mejora del equilibrio de los estudiantes con discapacidad auditiva, resultando altamente importantes para estimular su proceso de inclusión a las clases de educación física y promover un entorno educativo equitativo, respetuoso e inclusivo. Área de estudio general: Educación. Área de estudio específica: educación física Inclusiva. Tipo de estudio:  Artículo de investigación original.
O ensino de Ciências Contábeis e a metodologia Problem Based Learning (PBL)
Authors: Santos Whendel Whesley Segundo dos , Temóteo Tércia Leocádio , Araújo Gracyanne Freire de , Ouro Filho Abimael Magno do
Published: February 2025

O objetivo desta pesquisa é analisar a experiência da aplicação de uma atividade nos moldes do método PBL (Problem-Based Learning – Aprendizagem Baseada em Problemas) de forma parcial na matéria de Contabilidade Industrial do curso de graduação em Ciências Contábeis de uma universidade particular. Tendo o conhecimento como fonte imprescindível para a evolução da sociedade e o uso de novas metodologias com conceitos pedagógico- didáticos que melhorem o processo de ensino e criem estratégias inovadoras que vão além das didáticas convencionais, tem sido alvo de vários estudos. A literatura traz o Problem Based Learning como alternativa para se aprender a aprender e trazer competências que estimulem uma conduta profissional mais ativa e eficiente, criando uma postura de maior responsabilidade e proatividade no ambiente de trabalho, como também facilidade de liderança e para a tomada de decisão. Diante da necessidade de trazer para sala de aula uma abordagem de ensino com maior participação dos alunos e estimular a pesquisa, esse estudo empírico possibilitou a aplicação de uma atividade problema na disciplina sendo desenvolvida em duas etapas durante uma semana com a participação de vinte e dois alunos, que executaram a atividade e avaliaram por meio de questionário a metodologia PBL. Está pesquisa tem caráter experimental e pela análise dos resultados é visto que os discentes demonstraram satisfação com esse novo método de ensino e de sua aplicação, podendo ser posteriormente uma alternativa a ser adotada pela Instituição mesclando as aulas tradicionais com essa metodologia construtivista.
Uji Metrologi Gerak Melingkar Pada Mesin CNC Milling Di Bengkel Mekanik Polmanbabel
Authors: Syahbilla Muthiara , Husman Husman , Erwansyah Erwansyah
Published: February 2025

The manufacturing industry now demands machining processes that are not only precise but also highly efficient. Computer Numerical Control (CNC) machines such as CNC milling have emerged as the answer to these challenges by enabling high-precision mass production. The State Polytechnic of Manufacturing in Bangka Belitung has an aging CNC Milling Machine Lagun MC-750, which has been in use since the establishment of the campus several years ago. The research is focused on metrological testing of circular motion on the CNC Milling machine in the Mechanical Workshop of Polmanbabel. The analytical method involves experimental studies encompassing machining processes, data collection of the results, and data analysis. The machining process is carried out using the CNC Milling Machine Lagun MC-750 with specific parameters such as cutting depth, cutting speed, and feed motion. The test specimens are made of S45C steel with dimensions Ø31.6 x 50 mm. The analysis of 12 specimens revealed a value of 146 μm for clockwise feed motion (G02) and 174 μm for counterclockwise feed motion (G03) for the other 12 specimens. These results fall within the tolerance grade IT 10. This indicates that the machine is suitable for processing workpieces within standard tolerances, as IT 10 is commonly used in general machining for interchangeable parts that can also be classified as highly precise work.
Pemanfaatan Limbah Cangkang Kerang Dara (Andara Granosa) Sebagai Alternatif Katalisator Pada Proses Carburizing
Authors: Anshari Satria , Ramli Ramli , Sugiyarto Sugiyarto
Published: February 2025

Along with the rapid advancement of technology, the utilization of steel in the industrial world is increasing. St 42 carbon steel is a type of low alloy carbon steel, so this steel has a relatively low hardness and soft properties but has a high ductility value. It is necessary to improve its mechanical properties such as hardness. Improvement of these properties requires the park carburizing process. The purpose of this research is to determine the feasibility of turtle shell powder as a catalyst and coconut shell activated charcoal powder as a carbon source in the carburizing process of St 42 steel. The research method includes turtle shell powder with variations of 0%, 10%, 20%, and 30%, then followed by a rapid cooling process using water media. From the test results, it can be seen that the mechanical properties of the highest hardness value are found in the 20% variation of the turtle shell catalyst with a time of 9 hours experiencing an increase, inversely proportional to the hardness. impact test value with a 20% variation of the catalyst with a time of 9 hours decreased. So it can be concluded that the high hardness value will be inversely proportional to the results of the low impact test value.
Precipitation Behavior and Mechanical Properties of High-Nitrogen Austenitic Stainless Steel According to Chemical Composition and Heat Treatment Temperature
Authors: Kwon Ki-Hwan , Kim Seong Hoon , Jo Hyo-Haeng , Lee Jinjong , Ha Heon-Young , Lee Chang-Hoon , Jeong Jae-Suk , Lee Tae-Ho , Kang Nam Hyun
Published: February 2025

The precipitation behavior and mechanical properties of high-nitrogen austenitic stainless steels were investigated for various chemical compositions and solution treatment temperatures. For this study, Fe-22.1Cr-12.2Ni-5.1Mn-2.1Mo alloys with three different sets of Nb, V, and N contents were prepared, and two distinct solution treatment temperatures were applied. An increase in Nb or N content resulted in finer austenite grain size, attributed to the formation of additional precipitates, such as Z-phase and (Nb,V)(C,N), at the grain boundaries. Notably, the effect of a 0.07 wt% increase in Nb content was found to be comparable to more than a 100oC reduction in solution treatment temperature. The yield strength was observed to increase with decreasing grain size, consistent with the Hall-Petch relationship. When the grain size effect was excluded, and in the absence of Z-phase, a higher N content led to an increase in strength due to solid solution strengthening. On the other hand, an increase in Nb content resulted in reduced strength, even though there was little change in the austenite N content. Thermodynamic analysis suggested that Z-phase precipitation may replace MX particles, which could account for the observed decrease in strength. While Z-phase precipitation promotes a finer grain size, coarse Z-phase particles did not contribute effectively to precipitation hardening. Therefore, to achieve higher strength in high-nitrogen austenitic stainless steels, alloy design must be optimized, particularly when Nb addition is considered.
Enhanced Photoelectrochemical Performance by Constructing CdS/CdSe Heterojunction Structure
Authors: Hurh Dong-gyu , Kim Jung Hyeun
Published: February 2025

The growing need for sustainable energy development has become a critical issue due to worsening environmental pollution and climate change. Among the various technologies, the photoelectrochemical technology has been recognized as one of the essential approaches for advancing sustainable energy production. Out of the semiconductor materials used in PEC systems, cadmium sulfide (CdS) and cadmium selenide (CdSe) have been widely studied as promising candidates due to their advantageous properties. CdS, with a bandgap of 2.4 eV and high photoactivity, and CdSe, with a narrower bandgap of 1.9 eV and excellent light absorption characteristics, offer complementary advantages. In this study, we synthesized the CdS and CdSe materials via hydrothermal and chemical bath deposition methods, respectively, to fabricate a CdS/CdSe heterojunction photoanode system. The heterojunction CdS/CdSe photoanode formed a type-II structure, which facilitated efficient charge separation and transfer. Moreover, the CdS/CdSe photoanode exhibited high light absorption properties with very low charge transfer resistance, attributed to the role of CdS particles beneath CdSe as an electron transfer layer and the porous structure of the composite material. As a result, the CdS/CdSe photoanode achieved high photocurrent density of 4.51 mA·cm-2 comparing to their individual cases, representing a 78% improvement in PEC performance compared to the only CdSe photoanode case.
Performance Trade-Off in Nickel-Based Hydrogen Evolution Catalysts for Anion Exchange Membrane Water Electrolysis: Effects of the Nickel Oxidation State and Particle Size
Authors: Lee Jaehun , Kim Nam In , Jin Song , Park Junyoung , Ha Jun Seok , Kim Chiho , Lee Jooyoung , Kim Yangdo , Choi Sung Mook
Published: February 2025

The development of green hydrogen through anion exchange membrane water electrolysis (AEMWE) is essential for achieving carbon neutrality. Developing non-precious-metal catalysts for the hydrogen evolution reaction (HER) is crucial for the commercialization of AEMWE. In this study, Ni-CeO2/C catalysts were synthesized via a co-precipitation method and a reduction heat treatment was conducted from 300 to 500 oC to form metallic Ni for the HER. Through this process, CeO2 nanoparticles were uniformly dispersed around Ni metal nanoparticles. Among these catalysts, Ni-CeO2/C 400 exhibited a prominent Ni0 peak according to an XPS analysis and formed smaller nanoparticles compared to Ni-CeO2/C 500, yielding advantageous physicochemical properties for the HER. Subsequently, an electrochemical half-cell LSV analysis demonstrated the lowest HER overpotential of 164 mV at 10 mA cm-2 and a Tafel slope of 89 mV dec-1, suggesting the formation of a trade-off point in the HER performance due to variations in the oxidation state and particle size of the Ni metal. Furthermore, a non-precious-metal-based AEMWE single cell with Ni-CeO2/C 400 as the cathode and Co3O4 as the anode achieved a current density of approximately 700 mA cm-2 at 2.0 Vcell. It also exhibited stable durability at a constant current of 500 mA cm-2 for 100 hours, suggesting the potential for long-term hydrogen production in non-precious-metal-based AEMWE systems.
Good practice for assignment of breeds and populations—a review
Authors: Wilmot H. , Gengler N.
Published: February 2025

With the purpose to organize methodologies found in (recent) papers focusing on the development of genomic breed/population assignment tools, this review proposes to highlight good practice for the development of such tools. After an appropriate quality control of markers and the building of a representative reference population, three main steps can be followed to develop a genomic breed/population assignment tool: 1) The selection of discriminant markers, 2) The development of a model that allows accurate assignment of animals to their breed/population of origin, the so-called classification step, and, 3) The validation of the developed model on new animals to evaluate its performances in real conditions. The first step can be avoided when a mid- or low-density chip is used, depending on the methodology used for assignment. In the case selection of SNPs is necessary, we advise the use of one stage methodologies and to define a threshold for this selection. Then, machine learning can be used to develop the model per se, based on the selected or available markers. To tune the model, we recommend the use of cross-validation. Finally, new animals, not used in the first two steps, should be used to evaluate the performances of the model (e.g., with balanced accuracy and probabilities), also in terms of computation time.
Gene expression changes in blastocyst hatching affect embryo implantation success in mice
Authors: An Liyou , Zhang Liang , Wu Yulin , Teng Yadi , Liu Zihan , Ma Meixiang , Li Miaolong , Peng Xinrong , Liu Chenxi
Published: February 2025

In mammalian embryonic development, blastocyst hatching is essential for normal implantation and development of the fetus. We reported previously that blastocysts hatching out of the zona pellucida (ZP) exhibited site preferences that were associated with pregnancy outcomes. To characterize these site differences, we analyzed the transcriptomes in the following developing mouse blastocysts within 16 h of hatching: expanding (E), hatching from the A-site (A), B-site (B), and C-site (C), hatched (H), and non-hatching (N). By principal component analysis and hierarchical cluster analysis, we determined that the gene expression profiles of A and B blastocysts, which resulted in good fertility, clustered closely. C and N blastocysts, which resulted in poor fertility, clustered closely, but distantly from A and B. Embryos hatched at B- vs. C-sites, with good vs. poor pregnancy, showed 178 differentially expressed genes (DEGs), mainly involved in immunity, which correlated positively with birth rate. These DEGs were primarily regulated by transcription factors TCF24 and DLX3. During blastocyst hatching, immune-related genes were regulated, such as Ptgs1, Lyz2, Il-α, Cfb (upregulated) and Cd36 (downregulated). By immunofluorescence staining, we found C3 and IL-1β on the extra-luminal surface of the trophectoderm of the hatched blastocyst, suggesting that they play a role in maternal-fetal interactions. As the blastocysts developed from the expanding to the fully hatched state, 307 DEGs were either upregulated by transcription factor ATOH8 or downregulated by SPIC to switch on immune pathways. Based on the hatching outcome, we identified three transcription patterns in developing blastocysts, with complex changes in the transcriptional regulation network of failed hatched blastocysts vs. successfully hatched blastocysts. We developed a LASSO regression-based model using DEGs Lyz2, Cd36, Cfb, and Cyp17a1 to predict implantation success. This study revealed the diverse, multidimensional developmental fates of blastocysts during short-term hatching and indicated that the immune properties of the embryo had a major effect on blastocyst hatching outcomes. We suggest that transcriptional changes and their regulation during the development of the preimplantation blastocyst affect implantation. This study contributes to our understanding of the role of transcriptional changes in mammalian embryonic development during hatching and their effect on maternal-fetal interactions.
The lamprey habenula provides an extreme example for the temporal regulation of asymmetric development
Authors: Guichard Lucile , Lagadec Ronan , Michel Léo , Mayeur Hélène , Fuentès Michaël , Pain Jordan , Heier Noah , Rougemont Quentin , Rodicio Maria Celina , Barreiro-Iglesias Antón , Blader Patrick , Schubert Michael , Mazan Sylvie
Published: February 2025

By their phylogenetic position and their marked epithalamic asymmetries, lampreys are relevant models for understanding the formation and evolution of this trait across vertebrates. In this study, we use a transcriptomic approach to identify novel signature markers to characterize the highly asymmetric, bipartite organization of habenulae in lampreys. Lamprey habenulae are subdivided into two complementary subdomains related, respectively, to the lateral/ventral and the medial/dorsal habenulae of jawed vertebrates: a dorsal, right-restricted subdomain and a bilateral subdomain that includes the left habenula as well as its ventral right counterpart. Analysis of the formation of the lamprey habenula at prolarval and larval stages using a combination of morphological, immunohistochemical, and in situ hybridization approaches highlights a marked asymmetric temporal regulation. The dorsal right subdomain forms and already expresses all identified signature markers in prolarval stages. In contrast, the left and ventral right subdomain appears significantly later, with the first indication of neuronal identity elaboration in these territories being observed in larval stages. As in gnathostomes, Wnt signaling may be involved in the regulation of this unique, asymmetric mode of development, since β-catenin shows asymmetric and highly dynamic nuclear distributions both in neural progenitors and differentiated neuronal precursors of the two habenular subdomains. These data confirm the importance of lampreys to unravel the developmental logic underlying the recurrence and variation of habenular asymmetries in vertebrates and pave the way for future functional analyses.
A 40-year remote sensing analysis of spatiotemporal temperature and rainfall patterns in Senegal
Authors: Nakalembe Catherine , Frimpong Diana B. , Kerner Hannah , Sarr Mamadou Adama
Published: February 2025

Climate change impacts manifest differently worldwide, with many African countries, including Senegal, being particularly vulnerable. The decline in ground observations and limited access to these observations continue to impede research efforts to understand, plan, and mitigate the current and future impacts of climate change. This occurs at a time of rapid growth in Earth observations (EO) data, methodologies, and computational capabilities, which could potentially augment studies in data-scarce regions. In this study, we utilized satellite remote sensing data leveraging historical EO data using Google Earth Engine to investigate spatio-temporal rainfall and temperature patterns in Senegal from 1981 to 2020. We combined CHIRPS precipitation data and ERA5-Land reanalysis datasets for remote sensing analysis and used the Mann–Kendall and Sen's Slope statistical tests for trend detection. Our results indicate that annual temperatures and precipitation increased by 0.73°C and 18 mm in Senegal from 1981 to 2020. All six of Senegal's agroecological zones showed statistically significant upward precipitation trends. However, the Casamance, Ferlo, Eastern Senegal, Groundnut Basin, and Senegal River Valley regions exhibited statistically significant upward trends in temperature. In the south, the approach to climate change would be centered on the effects of increased rainfall, such as flooding and soil erosion. Conversely, in the drier northern areas such as Podo and Saint Louis, the focus would be on addressing water scarcity and drought conditions. High temperatures in key crop-producing regions, such as Saraya, Goudiry, and Tambacounda in the Eastern Senegal area also threaten crop yields, especially maize, sorghum, millet, and peanuts. By acknowledging and addressing the unique impacts of climate change on various agroecological zones, policymakers and stakeholders can develop and implement customized adaptation strategies that are more successful in fostering resilience and ensuring sustainable agricultural production in the face of a changing climate.