570 research outputs found
Evaluation of Original and Enzyme-Modified Fique Fibers as an Azo Dye Biosorbent Material
[EN] As natural fibers, low-cost biosorbents have proven to be an effective and clean tool to remove textile dyes from wastewater. In this research, the Reactive Black 5 removal ability of original and enzyme-modified natural fibers were assessed. A fiber extracted from a Colombian fique plant (Furcraea sp.) was employed. The effects of fique fiber protonation with different solvents and dye solution pH on RB5 removal were evaluated. The biosorbent chemical composition was modified using the commercial enzymes pectinase, ligninase, and xylanase. The point of zero charge (PZC) of the original and modified material was measured, and the dye removal capacity of the three enzyme-modified fibers was determined. Fiber protonation with 0.1 M HCl and a dye solution with pH of 2.4 increased the RB5 elimination to 49.1%. The change in the fiber chemical composition led to a reduction in the PZC from 5.5 to a 4.7¿4.9 range. Pectinase-pretreated fique fibers presented the highest dye removal of 66.29%, representing a 36% increase in RB5 dye removal. Although the original fique fiber showed RB5 dye removal ability, its enzymatic modification changed the charge distribution on the fiber surface, improving the capture of dye molecules. Enzyme modification can be applied to obtain new functionalities for plant fibers as biosorbent materials.This research was funded by Ministry of Science, Technology and Innovation of Colombia (MINCIENCIAS), Becas Doctorados Nacionales, grant number 617-2013.Muñoz-Blandón, O.; Ramírez-Carmona, M.; Cuartas Uribe, BE.; Mendoza Roca, JA. (2022). Evaluation of Original and Enzyme-Modified Fique Fibers as an Azo Dye Biosorbent Material. Water. 14(7):1-15. https://doi.org/10.3390/w1407103511514
Multimedia communications in vehicular adhoc networks for several applications in the smart cities
[EN] Road safety applications envisaged for vehicular ad hoc networks (VANETs) depend largely on the exchange of messages to deliver information to concerned vehicles. Safety applications as well as inherent VANET characteristics make data dissemination an essential service and a challenging task. We are developing a decentralized efficient solution for broadcast data dissemination through two game-theoretical mechanisms. Besides, VANETs can also include autonomous vehicles (AVs). AVs might represent a revolutionary new paradigm that can be a reality in our cities in the next few years. AVs do not need a driver to work; instead, they should copy a proper human behavior to adapt the driving according to the current circumstances, such as speed limit, pedestrian crossing street or wheather conditions. We will develop an AV software module including artificial intelligence (AI) techniques so that AVs can interact with the dynamic scenario throughout time. Finally, we also will include electrical vehicles (EV) in the VANET, so that special services such as finding and reserving an EV charging station place will be welcome. In addition, we are developing a multimetric geographic routing protocol for VANETs to transmit H.265 video (traffic accident, traffic state, commercial….) over VANETs.This work was partly supported by the Spanish Government through the project TEC2014-54335-C4-
1-R INcident monitoRing In Smart COmmunities, QoS and Privacy (INRISCO). Cristian Iza is recipient of a grant from Secretaria Nacional de Educación Superior, Ciencia y Tecnología SENESCYT. Ahmad Mohamad Mezher is a postdoctoral researcher with the Information Security Group (ISG) at the Universitat Politècnica de Catalunya (UPC).Iza Paredes, C.; Uribe Ramírez, JA.; López Márquez, N.; Lemus, L.; Mezher, A.; Aguilar Igartua, M. (2018). Multimedia communications in vehicular adhoc networks for several applications in the smart cities. Editorial Universitat Politècnica de València. 212-215. https://doi.org/10.4995/JITEL2017.2017.6584OCS21221
MICROBIOLOGICAL ANALYSIS OF TILAPIA AND WATER IN AQUACULTURE FARMS FROM SINALOA
Tilapia is the most cultivated fish around the world. The fish’s environment can harbor bacteria, especially coliforms, which are not normal biota of fish. These microorganisms are contamination indicator groups (IGs) reflecting the possible presence of pathogens, which can compromise the safety of fishery products. The IGs prevalence was estimated in tilapia and water from 29 aquaculture farms. Total and fecal coliforms (TC, FC), mesophilic aerobic bacteria (MAB), S. aureus, E. coli, Salmonella sp., and Streptococcus sp., were investigated. In tilapia, TC and FC were detected in 64% and 48% of the samples, ranging from 4.0 x 101 to 9.8 x 105, and from 1.0 x 101 to 6.4 x 103 CFU/g, respectively; MAB were detected in 90% of the samples. In water, TC and FC were detected in 57% and 35% of the samples, oscillating from 1.0 x 101 to 2.28 x104, and from 1.0 x 101 to 1.2 x 103 CFU/mL, respectively. MAB were detected in 89% of the water samples. Mostly E. coli and Enterobacter agglomerans were detected. Generally, IGs concentrations meet the Mexican regulations; however, the tilapia’s microbiological quality must be continuously monitored
Plant characterization of genetically modified maize hybrids MON-89Ø34-3 × MON-88Ø17-3, MON-89Ø34-3 × MON-ØØ6Ø3-6, and MON-ØØ6Ø3-6: alternatives for maize production in Mexico
Environmental risk assessment (ERA) of genetically modified (GM) crops is a process to evaluate whether the biotechnology trait(s) in a GM crop may result in increased pest potential or harm to the environment. In this analysis, two GM insect-resistant (IR) herbicide-tolerant maize hybrids (MON-89Ø34-3 9 MON-88Ø17-3 and MON-89Ø34-3 9 MON-ØØ6Ø3-6) and one herbicide-tolerant GM hybrid (MON-ØØ6Ø3-6) were compared with conventional maize hybrids of similar genetic backgrounds. Two sets of studies, Experimental Phase and Pilot Phase, were conducted across five ecological regions (ecoregions) in Mexico during 2009–2013, and data were subject to meta-analysis. Results from the Experimental Phase studies, which were used for ERA, indicated that the three GM hybrids were not different from conventional maize for early stand count, days-tosilking, days-to-anthesis, root lodging, stalk lodging, or final stand count. Statistically significant differences were observed for seedling vigor, ear height, plant height, grain moisture, and grain yield, particularly in the IR hybrids; however, none of these phenotypic differences are expected to contribute to a biological or ecological change that would result in an increased pest potential or ecological risk when cultivating these GM hybrids. Overall, results from the Experimental Phase studies are consistent with those from other world regions, confirming that there are no additional risks compared to conventional maize. Results from Pilot Phase studies indicated that, compared to conventional maize hybrids, no differences were detected for the agronomic and phenotypic characteristics measured on the three GM maize hybrids, with the exception of grain moisture and grain yield in the IR hybrids. Since MON-89Ø34- 3 9 MON-88Ø17-3 and MON-89Ø34-3 9 MONØØ6Ø3- 6 confer resistance to target insect pests, they are an alternative for farmers in Mexico to protect the crop from insect damage. Additionally, the herbicide tolerance conferred by all three GM hybrids enables more cost-effective weed management
una mirada desde las Ciencias de la Conducta
Este libro es el resultado de los trabajos presentados en el 1er Congreso Internacional "Convivencia y bienestar con sentido humanista para una cultura de paz"
POR UNA CULTURA DE PAZ: UNA MIRADA DESDE LAS CIENCIAS DE LA CONDUCTA
En
virtud
de
lo
anterior,
los
estudiosos
de
las
ciencias
de
la
conducta
de
la
Universidad
Autónoma
del
Estado
de
México,
ante
la
persistencia
y
proliferación
de
estos
hechos
en
diversas
partes
del
Mundo
y
de
nuestro
país
en
particular, se
convocó
a
los
estudiosos
interesados
y
a
la
sociedad
en
general
a
presentar
trabajos
para
analizar,
debatir
y
proponer
estrategias
de
acción
y
dirección,
que
fortalezcan
una
convivencia y bienestar con sentido humanista para una cultura de paz.
El
presente
texto
es
producto
de
esta convocatoria
que
recoge
los
trabajos
de
los
interesados
en
la
temática,
de
diferentes
países
(España,
Argentina,
Cuba,
Brasil,
Costa
Rica
y
México)
retomando
con
ello
sus
experiencias
relativas
al
estudio,
análisis,
comprensión
e
instrumentación
de
la
cultura
de
paz
en
los
distintos
ámbitos
institucionales
en
los
que
participan:
educativo,
salud,
penitenciario,
social,
laboral,
familia,
alimentario,
psicológico,
por
mencionar
algunos.
El
presente
libro,
propicia
un
espacio
de
reflexión,
diálogo
y
posicionamiento
de
las
ciencias
de
la
conducta
para
la
apropiación,
análisis,
debate
y
propuestas
que
fortalezcan
una
cultura
de
paz
a
través
de
la
convivencia
y
el
bienestar
social
con
sentido
humanista.
El
sistema
económico
neoliberal
y
el
proceso
de
globalización
han
contribuido
al
logro
de
avances
significativos
en
la
ciencia
y
la
tecnología,
pero
también
han
propiciado
la
polarización
de
las
sociedades
lo
que
ha
impactado
de
manera
negativa
a
la
sociedad
en
su
conjunto,
pero
en
mayor
medida
a
los grupos
vulnerables. Dicha
polarización
ha
traído
consigo
un
desarrollo
desigual
del
mundo
que
se
expresa
de
diferentes
maneras
tanto
en
países
desarrollados
como
en
los
llamados
del
tercer
mundo,
en
donde
no
están
satisfechas
las
necesidades
humanas
elementales
de
todos
los
sectores
de
la
población,
siempre
falta
algo.
Si
a
esto
le
sumamos
los
conflictos
internacionales por
diferentes
motivos
que
enfrentan
algunas
naciones,
una
insuficiente
cobertura
educativa
y
de
salud,
desempleo
y
pobreza
extrema,
entre
otras
cosas;
estamos
frente
a
retos
de
gran
envergadura
para
los
gobiernos,
para
los
estudiosos
y
para
la
sociedad
civil
en
general. Uno
de
los
intentos
para
frenar
y prevenir
la
agudización
de
estas
problemáticas
es
la
cultura
de
paz,
cuyo
estudio
y propuestas
han
ido
avanzando
en
diferentes
sentidos
y
de
manera
favorable,
el
tema
está
presente
en
diferentes
Organismos
Internacionales
como
la
ONU,
la
UNESCO,
la
OCDE,
El
Banco
Mundial,
entre
otros.
Pero
falta
mucho
por
hacer.Universidad Autónoma del Estado de Méxic
Diseño para el desarrollo sustentable y la habitabilidad segura e incluyente
Este libro se divide en dos partes que permiten permear en el campo de la enseñanza del diseño; la primera se enfoca en temáticas que se desprenden del diseño en la educación para la sustentabilidad; en la segunda, se identifican las tendencias del diseño como un modo de verlo y sentirlo: va desde el diseño emocional hacia uno de conservación, reúso y reparación de objetos para reducir el consumo de recursos materiales
TALLER: PRÁCTICAS DE LABORATORIO SUSTENTABLES; UN DIÁLOGO DESDE EL CUIDADO DEL AMBIENTE Y LA ENSEÑANZA DE LA FÍSICA. UNA PROPUESTA DESDE LAS MÁQUINAS DE GOLDBERG
Este taller pretende mostrar la importancia de las máquinas de Goldberg como herramienta de dialogo entre las tensiones en la enseñanza de la Física y el problema generalizado de desperdicio de elementos reciclables en las diversas escuelas de básica y media. Que se devele una solución dialógica enmarcada en la creación de prácticas de laboratorio de física, accesible para los estudiantes, entendiendo la accesibilidad a las cuestiones prácticas y por supuesto cognitivas, asociadas a los montajes de laboratorio. Esta propuesta surge de la preocupación generalizada de los estudiantes del seminario de enseñanza de la física, del departamento de Física, apropósito de vislumbrar nuevas formas para la enseñanza de la física en la escuela, que trascienda lo tradicional y se posibiliten como punto de encuentro de las necesidades particulares de la comunidad educativa, para este caso, encontramos dos particularidades de preocupación colectiva, la primera, mostrar la física como una ciencia al alcance de todos y segundo decantar las consecuencias de generar una lógica del cuidado del entorno.Esta apuesta surge en el marco de las discusiones del seminario de enseñanza de la física (licenciatura en física) a propósito del papel que tiene la física en la escuela frente a su enseñabilidad
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