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Selecciona los temas de tu interés y recibe en tu correo las publicaciones más actuales
Francois Tardieu (2007, [Artículo])
Environmental Stimuli Expansins CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CELLS CROPS GENETIC ENGINEERING PROTEINS TISSUE EPIDERMIS ZEA MAYS
URIEL ALEJANDRO LOPEZ LEMUS RAQUEL GARZA GUAJARDO ORALIA BARBOZA QUINTANA ALEJANDRINA RODRIGUEZ HERNANDEZ José Guzmán Esquivel ALEJANDRO GARCÍA RIVERA VIOLETA M. MADRIGAL PÉREZ LAURA ELVIRA GARCÍA LABASTIDA ALEJANDRO DAVID SORIANO HERNANDEZ MARGARITA DE LA LUZ MARTINEZ FIERRO IRAM PABLO RODRIGUEZ SANCHEZ ELIZABETH SANCHEZ DUARTE ARIANA CABRERA LICONA GABRIEL CEJA ESPIRITU IVAN DELGADO ENCISO (2018, [Artículo])
Metabolic syndrome (MS) has been associated with testicular damage. Nonalcoholic fatty liver disease (NAFLD) is a multisystemic disease that affects different organs, but its effect on the testes is unknown. A study analyzing germ cell involvement on BALB/c mice was carried out. A parallel comparative study was conducted that investigated alterations in the germinal epithelium of male humans that died from an unrelated acute event. The complete medical histories and histologic samples of the thoracic aorta, liver tissue, and testicular tissue from the deceased subjects were collected. The degree of germinal epithelial loss (DGEL) was evaluated and the clinical and histologic data were compared between individuals with and without NAFLD. The only metabolic or morphologic variable that caused a significant difference in the DGEL, in both the animal model and humans, was the presence of liver steatosis. The percentage of steatosis was also correlated with the percentage of the DGEL. In humans, steatosis (greater than 20%) increased the risk 12-fold for presenting with a severe DGEL (OR: 12.5; 95% CI [1.2, 128.9]; p = .03). There was no association with age above 50 years or MS components. Steatosis grade was also correlated with atherosclerosis grade. NAFLD was a strongly associated factor implicated in severe DGEL, as well as the testis was identified as a probable target organ for damage caused by the disease. his finding could result in the search for new approach strategies in the management of men with fertility problems. Further studies are required to confirm these results.
MEDICINA Y CIENCIAS DE LA SALUD Germ cells Atherosclerosis Testis Metabolic syndrome
Infant population’s death causes in Ciudad Juarez, 1953-1954
Guadalupe Santiago Quijada (2022, [Artículo, Artículo])
This article presents a study about the causes of death of the child population in Ciudad Juarez, at the beginning of the second half of the 20th century. In this document, emphasis has been placed on investigating the government response, on the activities carried out by local health institutions to deal with the diseases and prevent the number of infant deaths from continuing to increase; and in a particular way, in the actions of society to reduce suffering and protect children. Regarding the sources of information that were used, the data registered in the death books of 1953 and 1954 that are in the Civil Registry of Ciudad Juarez were explored and quantified. Also, the newspaper El Fronterizo and various bibliography were reviewed to establish the urban historical context in which this tragedy occurred.
Ciudad Juárez, salud, enfermedades, mortalidad infantil HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA Ciudad Juarez demographic history diseases infant mortality
Thermal and mechanical properties of PLA-based multiscale cellulosic biocomposites
MIGUEL ANGEL RUZ CRUZ Pedro Jesús Herrera Franco Emmanuel Alejandro Flores Johnson MARIA VERONICA MORENO CHULIM LUCIANO MIGUEL GALERA MANZANO Alex Valadez González (2022, [Artículo])
In this work polylactic acid (PLA) based multiscale cellulosic biocomposites were prepared with the aim to evaluate the effect of the incorporation of cellulose nanocrystals (CNCs) on the PLA biocomposites reinforced with cellulose microfibers (MFCs). For this, PLA composite materials reinforced with both MFCs and with a combination of MFCs and CNCs were prepared, while keeping the content of cellulosic reinforcements constant. The thermal and mechanical properties of these multiscale PLA biocomposites were characterized by thermogravimetry (TGA), differential scanning calorimetry (DSC), flexural mechanical and, dynamic mechanical (DMA) tests. Likewise, they were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that the replacement of MFCs by CNCs in the 1–5% range appreciably modifies the thermal and mechanical properties of multiscale compounds. For example, they increase the thermal stability of the materials, modify the PLA crystallization process and play the role of adhesion promoters since the mechanical properties in flexure increase in the order of 40% and the storage modulus increases in the order of 35% at room temperature. Also, the addition of CNCs increases the relaxation temperature of the material from 50 to 60 °C, thereby expanding the temperature range for its use. © 2022 The Author(s)
MULTISCALE BIOCOMPOSITES CELLULOSE MICROFIBER CELLULOSE NANOCRYSTALS HIERARCHICAL STRUCTURE PROPERTIES INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES PROPIEDADES DE LOS MATERIALES PROPIEDADES DE LOS MATERIALES
Luis Fernando Maceda Lopez ELSA BEATRIZ GONGORA CASTILLO Enrique Ibarra-Laclette DALIA C. MORAN VELAZQUEZ AMARANTA GIRON RAMIREZ Matthieu Bourdon José Luis Villalpando Aguilar Gabriela Chavez-Calvillo Toomer John Tang Parastoo Azadi Jorge Manuel Santamaría Fernández Itzel López-Rosas Mercedes G Lopez June Simpson FULGENCIO ALATORRE COBOS (2022, [Artículo])
Resilience of growing in arid and semiarid regions and a high capacity of accumulating sugar-rich biomass with low lignin percentages have placed Agave species as an emerging bioen-ergy crop. Although transcriptome sequencing of fiber-producing agave species has been explored, molecular bases that control wall cell biogenesis and metabolism in agave species are still poorly understood. Here, through RNAseq data mining, we reconstructed the cellulose biosynthesis pathway and the phenylpropanoid route producing lignin monomers in A. tequilana, and evaluated their expression patterns in silico and experimentally. Most of the orthologs retrieved showed differential expression levels when they were analyzed in different tissues with contrasting cellulose and lignin accumulation. Phylogenetic and structural motif analyses of putative CESA and CAD proteins allowed to identify those potentially involved with secondary cell wall formation. RT-qPCR assays revealed enhanced expression levels of AtqCAD5 and AtqCESA7 in parenchyma cells associated with extraxylary fibers, suggesting a mechanism of formation of sclerenchyma fibers in Agave similar to that reported for xylem cells in model eudicots. Overall, our results provide a framework for un-derstanding molecular bases underlying cell wall biogenesis in Agave species studying mechanisms involving in leaf fiber development in monocots. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
AGAVE CELL WALLS LIGNOCELLULOSE CAD PROTEIN CESA PROTEIN SCLERENCHYMA BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA GENÉTICA GENÉTICA MOLECULAR DE PLANTAS GENÉTICA MOLECULAR DE PLANTAS
The search for cryptic L-Rhamnosyltransferases on the Sporothrix schenckii genome
Hector M. Mora-Montes Karina García-Gutiérrez Laura Cristina García Carnero Nancy Lozoya-Perez Jorge Humberto Ramírez Prado (2022, [Artículo])
The fungal cell wall is an attractive structure to look for new antifungal drug targets and for understanding the host-fungus interaction. Sporothrix schenckii is one of the main causative agents of both human and animal sporotrichosis and currently is the species most studied of the Sporothrix genus. The cell wall of this organism has been previously analyzed, and rhamnoconjugates are signature molecules found on the surface of both mycelia and yeast-like cells. Similar to other reactions where sugars are covalently linked to other sugars, lipids, or proteins, the rhamnosylation process in this organism is expected to involve glycosyltransferases with the ability to transfer rhamnose from a sugar donor to the acceptor molecule, i.e., rhamnosyltransferases. However, no obvious rhamnosyltransferase has thus far been identified within the S. schenckii proteome or genome. Here, using a Hidden Markov Model profile strategy, we found within the S. schenckii genome five putative genes encoding for rhamnosyltransferases. Expression analyses indicated that only two of them, named RHT1 and RHT2, were significantly expressed in yeast-like cells and during interaction with the host. These two genes were heterologously expressed in Escherichia coli, and the purified recombinant proteins showed rhamnosyltransferase activity, dependent on the presence of UDP-rhamnose as a sugar donor. To the best of our knowledge, this is the first report about rhamnosyltransferases in S. schenckii. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
FUNGAL CELL-WALL GLYCANS RHAMNOCONJUGATES RHAMNOSYLTRANSFERASE BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA VEGETAL (BOTÁNICA) ECOLOGÍA VEGETAL ECOLOGÍA VEGETAL
ANA RUTH ALVAREZ SANCHEZ CLAUDIO HUMBERTO MEJIA RUIZ Héctor Gerardo Nolasco Soria Alberto Peña Rodríguez (2018, [Artículo])
"Marine yeasts used in aquaculture disease control can also be an important protein source for improving feeding and nutrition of crustaceans. Yarrowia lipolyticca has been studied for its capacity to secrete heterologous proteins and high content of unsaturated fatty acids, beta-glucan, and mannane polymers in the cell wall. We measured in vitro digestibility of Y. lipolyticca by whiteleg shrimp Litopenaeus vannamei digestive enzymes, and an in vivo assay of Y. lipolytica in feed onwhiteleg shrimp growth. We found that digestive gland enzymes of shrimp digest Y. lipolytica, based on reduced optical density of a yeast suspension. Digestion was –0.00236 ± 0.00010 OD U min–1 for intact cells and –0.00325 ± 0.00010 OD U min–1 for lysed cells. Release of reducing sugars in intact cells (5.3940 ± 0.1713 μmol h–1), and lysed cells (0.8396 ± 0.2251 μmol h–1) was measured. Digestive gland treatment significantly reduced cell viability (near 100%), relative to the control. Electron microscopy shows that the cell wall of Y. lipolytica exposed to the digestive gland enzymes was severely damaged. Shrimp diet containing Y. lipolytica resulted in significantly higher weight gain and specific growth rate of whiteleg shrimp."
Marine yeast, cell digestibility, cell viability, turbidimetry, reduced sugars BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOQUÍMICA BIOQUÍMICA DE ALIMENTOS BIOQUÍMICA DE ALIMENTOS
Marcelo Vidal Curiel Bernal (2023, [Tesis de doctorado])
"La presente tesis aborda una investigación sobre la biología, ecología y crecimiento de la Totoaba macdonaldi en el alto golfo de California. La totoaba, una especie endémica a esta región se encuentra actualmente en peligro de extinción debido a una serie de amenazas como: cambios en su ecosistema reproductivo y de crianza, pesca, incidental de juveniles e ilegal de adultos. Aunque en los últimos 30 años la población dio signos de recuperación, existen indicios de que tanto la población adulta como las abundancias de larvas presentan una tendencia decreciente. Lo que resalta la importancia de estudiar cómo la variabilidad ambiental incide en la distribución y abundancia de larvas de totoaba y subsecuentemente en el stock recluta de la especie. El estudio comienza con un análisis de la variabilidad del crecimiento individual en etapas juveniles y adultas de la totoaba. Para este propósito, se utiliza la varianza observada como elemento clave para parametrizar modelos de crecimiento individual. Los resultados indican que este enfoque proporciona estimaciones sólidas de los parámetros de crecimiento. A continuación, se investiga el crecimiento de las larvas de totoaba en condiciones de cultivo. Los datos revelan que un modelo sigmoideo describe mejor el crecimiento y se identifican dos puntos de inflexión en el crecimiento de las larvas. Estos hallazgos tienen importantes implicaciones para la cría y el cultivo de la totoaba para efectos de repoblación. Por último, se analiza la ecología y el transporte de las larvas de totoaba en el alto golfo de California. Se identifica una ventana óptima para el desove de la totoaba en términos de temperatura y concentración de clorofila, y se sugiere que las condiciones ambientales y la distribución de los adultos pueden influir en las abundancias de larvas en diferentes años. Además, se destaca la importancia del frente permanente al sur del alto golfo de California como una posible zona de acumulación de larvas como factor que contribuye al endemismo en la región. En conjunto, esta tesis representa un enfoque multidisciplinario para comprender los aspectos clave de la biología, ecología y crecimiento de la totoaba en el alto golfo de California. Los resultados proporcionan información valiosa para la conservación de esta especie amenazada y destacan la importancia de un enfoque integral en la gestión de los recursos marinos en esta región única."
"The following thesis addresses a research on the biology, ecology, and growth of Totoaba macdonaldi in the upper gulf of California. The totoaba, a fish species endemic to this region, is currently endangered due to a series of threats such as: changes in its reproductive and breeding ecosystem, juvenile bycatch, and illegal fishing. Although over the last 30 years, the population has shown signs of recovery, there are indications that both the adult population and larval abundances are on a declining trend. This underscores the importance of studying how environmental variability affects the distribution and abundance of totoaba larvae and subsequently the recruitment stock of the species. The study begins with an analysis of growth in juvenile and adult stages of the totoaba. For this purpose, observed variance is used to parameterize individual growth models. Results indicate that this approach provides robust estimates of growth parameters. Next, the growth of cultivated totoaba larvae is investigated. The data reveal that a sigmoid model better describes the growth in the early life stages of the totoaba, and two inflection points in larval growth are identified. These findings have important implications for the breeding and cultivation of the totoaba for restocking purposes. Finally, the ecology and transport of totoaba larvae in the upper gulf of California are analyzed. An optimal window for totoaba spawning in terms of temperature and chlorophyll concentration is identified, and it is suggested that environmental conditions and the distribution of adults may influence larval abundances in different years. Additionally, the importance of the permanent front to the south of the upper gulf of California is highlighted as a possible larval accumulation zone and a contributing factor to endemism in the region. Overall, this thesis represents a multidisciplinary approach to understanding key aspects of the biology, ecology, and growth of the totoaba in the upper gulf of California. The results provide valuable information for the conservation of this threatened species and underscore the importance of a comprehensive approach in the management of marine resources in this unique region."
Variabilidad ambiental, crecimiento, dispersión, rutas larvarias Environmental variability, growth, dispersion, larval routes CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS PECES Y FAUNA SILVESTRE PROPAGACIÓN Y ORDENACIÓN PROPAGACIÓN Y ORDENACIÓN
Hacia el desarrollo de un nuevo antiparasitario basado en células en suspensión de Carica papaya
CYNTHIA ALEJANDRA GUZMÁN MEDINA (2023, [Tesis de doctorado])
Las enfermedades parasitarias son un problema de salud pública que afectan a más de la
quinta parte de la población a nivel mundial. Además de la morbilidad que generan, sino
son tratadas y controladas de manera adecuada pueden llegar a causar la muerte.
En el mercado existen diferentes antiparasitarios comerciales, que si bien son efectivos,
presentan diferentes efectos adversos tanto para el individuo parasitado (i.e. destrucción
de la microbiota intestinal) como para el medio ambiente. Este panorama señala la
relevancia de desarrollar tratamientos antiparasitarios más amigables con el ambiente y con
menores efectos adversos que estén disponibles actualmente en el mercado. Productos
obtenidos a partir de plantas con propiedades anti-parasitarias, cultivadas in vitro en
condiciones controladas, podrían representar una alternativa realista. Entre ellas figura la
planta Carica papaya, especie de zonas tropicales y subtropicales del planeta a cuyos frutos
se les adjudica actividades antiparasitarias. Estas propiedades se atribuyen a algunos de
sus compuestos concentrados en el latex y en las semillas como la papaina, la
quimiopapaína, la lisozima, la glicil-endopeptidasa, la proteasa de cisteína y el benzil-
isotiocinato.
El objetivo del presente trabajo fue evaluar la actividad antiparasitaria in vitro e in vivo de
un conjunto de callos y líneas de células de papaya de Carica papaya contra cisticercos de
Taenia crassiceps (cestodo) y contra trofozoitos de Entamoeba histolytica (protozoario). Los
extractos acuosos obtenidos a partir de callos y células cultivados en placa o en suspensión,
respectivamente, de las diferentes líneas de papaya revelaron alta capacidad cisticida
(>98% de mortalidad) in vitro contra cisticercos de Taenia crassiceps. En la evaluación in
vivo la línea no transformada obtuvo mayor efecto cisticida a 10mg/mL reduciendo el
número de cisticercos gemantes y aumentando los cisticercos calcificados en niveles
similares a los obtenidos utilizando antiparasitarios comerciales (albendazol y niclosamida).
Las líneas transformadas y sin transformar de papaya evaluadas indujeron una alta
capacidad amebicida (97% de mortalidad) in vitro contra trofozoitos de Entamoeba
histolytica. Las diferentes líneas transformadas y sin transformar de papaya redujeron
significativamente el número de abscesos amebianos y previnieron la hepatomegalia de
manera no significativamente diferente que el anti-parasitario comercial (metronidazol).
Los resultados generados en el presente estudio señalan al extracto acuoso obtenido a
partir de cultivos en suspensión de células de papaya transformada y no transformada
indujeron alto nivel de protección in vitro e in vivo por lo tanto; este es un producto efectivo
para el tratamiento de la cisticercosis y la amebiasis.
Parasitic diseases are a public health problem that affect more than a fifth of the population
worldwide. Additionally, and along with the morbidity the produce, they can cause death if
they are not treated and controlled adequately.
There are different commercial antiparasitic on the market which, although effective,
present different adverse effects both for the individual (i.e., destruction of the intestinal
microbiota) and for the environment alike. This panorama points out the relevance of
developing more environmentally friendly antiparasitic treatments with fewer adverse effects
than the ones currently available on the market. Products obtained from plants with anti-
parasitic properties, grown in vitro under controlled conditions, could represent a realistic
alternative. Among them is the Carica papaya, a species from tropical and subtropical areas
of the planet whose fruits are believed to have antiparasitic activities. These properties are attributed to some of its compounds concentrated in the latex and seeds such as papain,
chymopapain, lysozyme, glycyl-endopeptidase, cysteine-proteinase and benzyl-
isothiocyanate.
The objective of the present work is to evaluate the in vitro and in vivo antiparasitic activity
of a set of papaya callus and cell lines from Carica papaya against cysticerci of Taenia
crassiceps (cestode) and against trophozoites of Entamoeba histolytica (protozoan). The
aqueous extracts obtained from callus and cells cultured in plates or in suspension,
respectively, of the different papaya lines revealed high cysticidal capacity (>98% mortality)
in vitro against Taenia crassiceps cysticerci. Meanwhile, in the in vivo evaluation, the non-
transformed line obtained a greater cysticidal effect at 10 mg/mL, reducing the number of
budding cysticerci and increasing calcified cysticerci at levels like those obtained using
commercial antiparasitic (albendazole and niclosamide). The papaya lines evaluated
induced a high amoebicidal capacity (97% mortality) in vitro against Entamoeba histolytica
trophozoites. The different papaya lines significantly reduced the number of amoebic
abscesses and prevented hepatomegaly in a non-significantly different manner than the
commercial anti-parasitic (metronidazole).
The results produced in this thesis indicate that the aqueous extract obtained from
suspension cultures of transformed and non-transformed papaya cells induced a high level
of protection in vitro and in vivo. Therefore, this may represent an effective product for the
treatment of cysticercosis and amoebiasis.
CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS Carica papaya, antiparasitario, células en suspensión, T. crassiceps, E. histolytica. Carica papaya, antiparasitic, in-suspension cells, T. crassiceps, E. histolytica.
Estudios de genética en poblaciones de abulón y sus aplicaciones en ordenamiento pesquero
RICARDO PEREZ ENRIQUEZ NOE DIAZ VILORIA JOSE LUIS GUTIERREZ GONZALEZ ALEJANDRA ARCINIEGA DE LOS SANTOS ADRIANA MAX AGUILAR Pedro Cruz Hernández Fernando Aranceta Garza (2016, [Artículo])
"Se presenta la integración de más de 10 años de investigación científica en genética de las poblaciones de abulón en México realizada en el CIBNOR. Esta investigación muestra cómo se pueden aplicar los marcadores genéticos tanto en estudios de genética poblacional como en identificación forense con la finalidad de contribuir al conocimiento aplicado para manejo de la pesquería. Se desarrollaron marcadores genéticos tipo microsatélites de ADN enfocados tanto al abulón azul Haliotis fulgens como amarillo Haliotis corrugata para diferenciación de poblaciones y análisis de parentesco. Un análisis de estructura genética de las poblaciones silvestres de ambas especies de abulón mostró homogeneidad genética en la costa del Pacífico en la región centro-sur de la Península de Baja California, México, pero con diferenciación genética en localidades distantes debido a un flujo genético limitado producto del aislamiento reproductivo. Por ello, no existen elementos que den soporte a un manejo pesquero delimitado por bancos en ambas especies. De manera particular, el abulón amarillo mostró una menor de diversidad genética que el azul, posiblemente debido a una mayor explotación pesquera histórica. Los resultados obtenidos en pruebas de parentesco han indicado que la retención larvaria en bancos específicos es reducida, por lo que ni la agregación de reproductores ni la liberación de larvas han mostrado ser estrategias eficientes para favorecer el incremento de reclutas en bancos definidos. Un análisis de perfiles genéticos con el gen de la lisina permitió la identificación de las especies de abulón que se capturan y enlatan en México. El análisis comparativo de perfi les genéticos, basado en el gen nuclear 18S de abulón y otros moluscos, detectó producto enlatado conteniendo especies de moluscos comercializadas falsamente como abulón, lo que puede constituirse como una herramienta forense en futuras disputas legales. Este tipo de aplicación es potencialmente utilizable con otros productos comestibles en los cuales se sospecha de prácticas fraudulentas, ya sea por captura o comercialización ilegal o por sustitución de contenidos en productos procesados."
"This is an integrative work of more than 10 years of research in population genetics of abalone in Mexico performed at CIBNOR. It shows how molecular tools have the potential to support abalone fisheries management through population genetics and forensic analyses. Microsatellite DNA markers were developed on blue (green for its name in English) Haliotis fulgens and yellow abalone (pink for its name in English) H. corrugata to be used for genetic differentiation on populations and for parentage analysis. The analysis of genetic structure on wild populations of both species revealed genetic homogeneity in the Pacific coast of the central region of the Baja California Peninsula, Mexico, with genetic differentiation on distant localities due to a limited gene flow as a result of reproduction isolation. From this result we suggest that no evidences were found supporting the management of the fishery based on individual abalone beds. Pink abalone shows lower genetic diversity than green abalone, possibly due to higher historical fishery exploitation. The parentage analysis suggested that larval retention within beds is reduced, indicating that neither broodstockaggregation nor the release of abalone larvae for stock enhancement are efficient strategies to increase recruitment in specific beds.
An analysis of the genetic profiles with the lysine gene allowed the identification of abalone species captured and processed in Mexico. The comparative analysis, based on the 18S gene, among abalone and other mollusks, detected canned product containing mollusks that are commercialized allegedly as abalone or ‘abalone type’, which could constitute a forensic tool in future legal disputes. This type of application can also be used with other edible products in which fraudulent practices are suspected either because of illegal catch or commercialization or substitution in processed products."
Análisis forense, diversidad genética, gen 18S, genética de poblaciones, marcadores genéticos, retención larvaria Forensic analysis, genetic diversity, 18S gene, genetic markers, population genetics, larval retention BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA GENÉTICA GENÉTICA DE POBLACIONES GENÉTICA DE POBLACIONES