Aportaciones al género Pestalotiopsis: identificación taxonómica, actividad antagonista y perfil químico de cepas aisladas del trópico y subtrópico de México

KARLA DANAE VERA PEREGRINO (2023, [Tesis de maestría])

BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOQUÍMICA BIOLOGÍA MOLECULAR BIOLOGÍA MOLECULAR

Enhancement of antibiotics antimicrobial activity due to the silver nanoparticles impact on the cell membrane

Roberto Vazquez-Munoz (2019, [Artículo])

The ability of microorganisms to generate resistance outcompetes with the generation of new and efficient antibiotics; therefore, it is critical to develop novel antibiotic agents and treatments to control bacterial infections. An alternative to this worldwide problem is the use of nanomaterials with antimicrobial properties. Silver nanoparticles (AgNPs) have been extensively studied due to their antimicrobial effect in different organisms. In this work, the synergistic antimicrobial effect of AgNPs and conventional antibiotics was assessed in Gram-positive and Gram-negative bacteria. AgNPs minimal inhibitory concentration was 10–12 μg mL-1 in all bacterial strains tested, regardless of their different susceptibility against antibiotics. Interestingly, a synergistic antimicrobial effect was observed when combining AgNPs and kanamycin according to the fractional inhibitory concentration index, FICI: <0.5), an additive effect by combining AgNPs and chloramphenicol (FICI: 0.5 to 1), whereas no effect was found with AgNPs and β-lactam antibiotics combinations. Flow cytometry and TEM analysis showed that sublethal concentrations of AgNPs (6–7 μg mL-1) altered the bacterial membrane potential and caused ultrastructural damage, increasing the cell membrane permeability. No chemical interactions between AgNPs and antibiotics were detected. We propose an experimental supported mechanism of action by which combinatorial effect of antimicrobials drives synergy depending on their specific target, facilitated by membrane alterations generated by AgNPs. Our results provide a deeper understanding about the synergistic mechanism of AgNPs and antibiotics, aiming to combat antimicrobial infections efficiently, especially those by multi-drug resistant microorganisms, in order to mitigate the current crisis due to antibiotic resistance. © 2019 Vazquez-Muñoz et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

ampicillin, antibiotic agent, aztreonam, beta lactam antibiotic, biapenem, chloramphenicol, kanamycin, silver nanoparticle, silver nitrate, antiinfective agent, metal nanoparticle, silver, antibiotic sensitivity, antimicrobial activity, Article, bact BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOFÍSICA BIOFÍSICA

EFECTOS DE LA CONFORMACIÓN ESTRUCTURAL DE UN SUBSTRATO EN LA EMISIÓN DE FLUORESCENCIA POLARIZADA: ANÁLISIS DE FACTIBILIDAD TÉCNICA PARA EL DESARROLLO DE UN SENSOR ÓPTICO CON APLICACIONES BIOMÉDICAS

Danay Hernández (2023, [Tesis de doctorado])

"La celulosa, localizada en las paredes celulares de las plantas, es uno de los polímeros más prevalentes en la naturaleza y puede ser obtenida mediante diversos métodos, incluida la síntesis de cierto tipo de bacterias. Este polímero da origen a un material específico denominado nanocelulosa, clasificado según su estructura en nanocristales (CNC, por sus siglas en inglés, Cellulose Nano-Crystals), nanofibras (CNF, por sus siglas en inglés, Cellulose Nano-Fibers) y celulosa bacteriana (BC, por sus siglas en inglés, Bacterial Cellulose). En el ámbito biomédico, los nanocristales de celulosa han tenido un impacto significativo debido a su biocompatibilidad y sostenibilidad, destacándose en aplicaciones como la fabricación de apósitos para el tratamiento y monitoreo de la cicatrización de heridas, un proceso que generalmente se evalúa objetivamente por especialistas."

Celulosa Nanocristales Biosensores Luz polarizada Fluorescencia Cristal líquido CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA

Innovative experimental plant to improve coffee processing

IVAN TOVAR ESTRADA Juan Francisco Cedano Lezcano EMANUEL VARGUEZ CALCANEO ESTEBAN GUZMAN RODRIGUEZ (2023, [Artículo])

In Mexico, coffee production refers to a process with traditional processing practices that combine rustic and semi-mechanized activities, where quality is not controlled, placing it in the category of conventional coffee. In recent years worldwide, the demand for high-quality coffee has increased and in order to offer this model, it is necessary to standardize the processing and transformation processes that increase the quality and value of the coffee. In order to exploit the different capacities in our country, it is necessary to design an innovative experimental plant for the processing of the primary coffee beneficiary, which is capable of adapting to the processes known by the producers, through the instruments and machinery the plant will provide The producer has control over the variables that influence taking advantage of the organoleptic properties of the coffee bean prior to harvest. The plant allows experimentation and obtaining controlled results according to the primary processing method to be applied. The development of the experimental plant has three iterative design cycles; 1) concept design, in which the various processes and methods investigated are evaluated to seek their homogenization with the help of instruments for monitoring and control, 2) prototype design, which is carried out with the help of 2D platforms and 3D modeling, that allow visualizing the location of the different equipment, as well as the flows of the different primary processing processes that the producer wishes to apply, and 3) innovation design, in which the products and services allow the value chain to be improved through processes instruments, data control and new techniques. For the development and maintenance of the experimental plant, it is necessary to link the entities that make up the quadruple helix; companies, government, society and public centers and institutes of higher education. In order to promote teamwork, collaboration and the exchange of ideas to strengthen, sustain and enrich the innovation ecosystem created through the experimental plant.

Benefited Specialty coffees INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

The pedestrian trajectories derived from the barriers of the public space

Amanda Casillas Ana Victoria Casillas Zapata (2023, [Artículo, Artículo])

Walking behavior respond to various factors, both internal and external, the first one is linked to the pedestrian's motivation, and the second one is linked to the opportunity offered by the built environment. The public space in the cities represents the main articulator of pedestrian movements, allowing flexible or fixed types of trips to be carried out. Therefore, those urban spaces that are detached from the network conformed by the pedestrian infrastructure could limit accessibility and alter the paths of travel. This study addresses the cases of three neighborhood parks that in recent years have had their configuration transformed by closing their perimeters in a partial or total way; the main objective of this study is to identify the types of pedestrian trajectories that derive from these barriers, as for those who move from within the neighborhoods and those who move from outside. These trajectories were analyzed under a qualitative approach and a descriptive scope. This allow us to determine that the parks, according to their disposition, have the potential to attract or repel the pedestrian movement, whether they were used as a destination or a connection place for displacement. In this way, it was possible to determine that the pedestrian trajectories are conditioned by the reduced permeability of these spaces.

Pedestrian mobility Public space Parks Barriers movilidad peatonal espacio público parques barreras conectividad HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA

The spatial control of migrants on the Chihuahua border

EDGAR ABEL CASTRO (2023, [Artículo, Artículo])

This article tries to link the immigration policies of the United States and Mexico with the narrative developed by Michel Foucault. It shows how racism is the axis on which the State of biopower exercises its claims and its effects of power on bodies and on life. Thus, the current political rationality goes through the management of the living body of people, their health, and their spatiality. This principle extends to the homicidal function of the State. Two events that occurred on the Chihuahua border demonstrate this.

migrant control Foucault border racism migrante frontera racismo HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA

La biofiltración sobre materiales orgánicos, nueva tecnología sustentable para tratar agua residual en pequeñas comunidades e industrias

Marco Antonio Garzón-Zúñiga Gerardo Buelna GABRIELA ELEONORA MOELLER CHAVEZ (2012, [Artículo])

El objetivo de este trabajo es presentar los resultados de las principales realizaciones a escala real de esta tecnología y su impacto en los sectores urbano (pequeños municipios, zonas rurales), agropecuario (granjas porcinas) y agroalimentario (rastros avícolas) en Canadá y México.

Biofiltración Tratamiento in situ Sistema de bajo mantenimiento Agua residual doméstica Agua residual industrial INGENIERÍA Y TECNOLOGÍA

OPTICAL PROPERTIES OF BLUE PHOSPHORENE CONSIDERING MANY-BODY EFFECTS

Juan Jose Nava (2023, [Tesis de maestría])

"The electronic band structure of blue phosphorene was obtained by using Density Functional Theory within the Generalized Gradient Approximation. It is observed, based on its band structure, that blue phosphorene shows a semiconducting nature, with an indirect band gap. The energy corrections to the bands were calculated in a specific set of k points within the irreducible Brillouin zone by employing the GW approximation and the complete quasiparticle band structure was determined by using maximally-localized Wannier functions. The excitonic spectrum is obtained and compared with both the independent-particle and GW optical response."

DFT Primeros principios BSE GW Función dieléctrica CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA ÓPTICA

Evaluación de indicadores de vulnerabilidad para localizar áreas de sedimentos en tres subcuencas de Chiapas, México

Vulnerability indicators assessment to locate areas of sediments in three sub-basins of Chiapas, Mexico

CERVANDO CASTILLO ROMANO Jorge Enrique Brena Zepeda Perla Edith Alonso Eguía Lis Ana Wagner (2014, [Memoria de congreso])

Para cuantificar la alternación ecológica en las subcuencias se consideraron los siguientes indicadores: cambio de cobertura vegetal y uso de suelo; número de poblaciones y densidad de población; erosión potencial; cambios provocados por la acción humana en la hidrografía; evaluación de la condición de la vegetación riparia; calidad del sistema acuático a partir de bioindicadores; condición de la fauna y; sedimentación en zona de humedales. Los resultados del estudio muestran que la sedimentación en la zona de humedales en las tres subcuencas presenta la máxima alteración de acuerdo con la escala utilizada, lo que indica una alta depositación de sedimentos en los humedales producto del deterioro ecológico. En general la parte alta, media y baja presentan un deterioro moderado, y en menor proporción se observan zonas con alto deterioro.

Humedales Sedimentación Vulnerabilidad Bioindicadores CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA

Ciudad Juarez from historical sketch of national migration policies

Luis Fernando Noyola Rojas Luis Manuel Lara Rodríguez (2023, [Artículo, Artículo])

The context of migration in the Mexican case and its migration policies are analyzed here, taking the case of Ciudad Juarez as a node of movement and link of said policies; for this, the work is divided into four sections. A historical review of the way of how migration policies, through programs operated by different institutions and spheres of government, have worked through the manifestations of the domestic and international Mexican migration it is proposed. It also serves to contextualize and to understand how they are created and why the objectives they intend to meet are more orientated to immediate problems rather to recognize the complexity of migratory problems, in need of specific policies.

migración políticas migratorias Ciudad Juárez frontera migración interna CIENCIAS SOCIALES CIENCIAS SOCIALES migration migration policies Ciudad Juarez border internal migration