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Ayala-Escobar V.,Colegio de Mexico | Gomez-Jaimes R.,Instituto Nacional de Investigaciones Nucleares | Santiago-Santiago V.,Technological Institute of Tlaxcala Plateau | Madariaga-Navarrete A.,Monterrey Institute of Technology | And 2 more authors.
Australasian Plant Disease Notes

Cowpea is one of the most important grain legume crops worldwide. Although Pseudocercospora cruenta on cowpea was first observed in Mexico in 1976, this is the first documented report of this pathogen in Mexico. The fungus was isolated from symptomatic cowpea leaves collected from Nayarit state, Mexico and identified on the basis of morphology and sequence analysis of the internal transcribed spacer (ITS). Pathogenicity was verified on cowpea plants. © 2013 Australasian Plant Pathology Society Inc. Source

Flores-Morales A.,Technological Institute of Tlaxcala Plateau | Jimenez-Estrada M.,National Autonomous University of Mexico | Mora-Escobedo R.,Escuela Nacional de Ciencias Biologicas
Carbohydrate Polymers

The nixtamalization, production and storage of tortillas in refrigeration cause several changes on the starch structure, resulting in an increased crystallinity and therefore a higher content of resistant starch. The IR analysis for resistant starch (RS) showed a band at 1047 cm-1 associated to the retrogradation process; this band was due to the weakening of the intermolecular H-bonds. These associated together to form ordered regions. The Raman analysis shows a characteristic band at 856 cm-1 corresponding to C-C skeletal modes of glucose of α-1,4 glycosidic linkage starches, and a band at 480 cm-1 attributed to skeletal vibrations of the pyranose ring in the glucose unit of starches. These changes may be related to the polymerization degree of the starch molecules, as well as to the retrogradation of amylose and amylopectin. The spectrum of 13C CP-MAS/NMR for RS3 supports the results obtained by IR and Raman. Lipidic and proteic groups were observed which may be in the form of complexes with amylose. One can proclaim that the existence of the salt form is induced and stabilized by the interactions dominating the V amylose structure in the solid state. © 2011 Elsevier Ltd. All Rights Reserved. Source

Ayala M.E.,Laboratorio Of Pubertad | Velazquez D.E.,Laboratorio Of Pubertad | Mendoza J.L.,Laboratorio Of Pubertad | Monroy J.,Laboratorio Of Pubertad | And 4 more authors.
Reproductive Biology and Endocrinology

Background: Innervation of the hypothalamus and median eminence arise from the dorsal and medial raphe nuclei (DRN and MRN, respectively). The hypothalamus regulates the secretion of gonadotropins, which in turn regulate the reproductive function of males and females. However, it is not known the role of raphe nuclei in male reproductive function. Our goal was to investigate the role of the DRN and MRN in the regulation of the testicular function and secretion of gonadotropins in prepubertal rats. Methods: Dihydroxytryptamine (5,6-DHT) in ascorbic acid was used to chemically lesion the DRN or MRN. Rats were treated at 30 days-of-age and sacrificed at 45 or 65 days-of-age. Sham-treated controls were injected with ascorbic acid only. Negative controls were untreated rats. The damage induced by the 5,6-DHT was monitored in coronal serial sections of DRN and MRN; only the animals in which lesion of the DRN or MRN was detected were included in this study. As output parameters, we measured the concentrations of noradrenaline (NA), dopamine (DA) and serotonin (5-HT) in the anterior (AH) and medial (MH) hypothalamus by high performance liquid chromatography (HPLC); whereas, circulating concentrations of gonadotropins and sexual steroids were measured by radioimmunoassay. Seminiferous epithelium and sperm quality were also evaluated. Results: Lesion of DRN or MRN does not induced changes in concentrations of LH, progesterone, and testosterone. Compared with the control group, the sham or lesion of the DRN or MRN did not modify noradrenaline or dopamine concentrations in the AH and MH at 45 or 65 days of age. Meanwhile, serotonin concentrations decreased significantly in lesioned rats. Lesion of DRN induced significantly lower concentrations of FSH regardless of age; similar lesion in the MRN had no impact on FSH levels. Sperm concentration and motility were significantly decreased in the same animals. The lesion of the MRN does not induced changes in the seminiferous epithelium or gonadotropin levels. Our results suggest that raphe nuclei regulate differentially the male reproductive functions. Conclusions: The DRN but not the MRN regulates the secretion of gonadotropins and testicular function. © 2015 Ayala et al. Source

Romero-Lopez M.R.,National Polytechnic Institute of Mexico | Osorio-Diaz P.,National Polytechnic Institute of Mexico | Flores-Morales A.,Technological Institute of Tlaxcala Plateau | Robledo N.,National Polytechnic Institute of Mexico | Mora-Escobedo R.,National Polytechnic Institute of Mexico
Revista Mexicana de Ingeniera Quimica

Characterization of the compounds present in aguamiel (A. atrovirens) by standard methods can evaluate the potential health effect of aguamiel as a functional food or food ingredient. Aguamiel contained 89.61% moisture, 3.50% protein, 3.10% ash, and 61.31% total reduced sugars, of which 32.63% was total fructose and 28.68% was total glucose, while the fructooligosaccharides content was 15.51%. The aguamiel contained minerals such as potassium, calcium, and sodium in higher proportions, followed by iron, copper, magnesium, selenium and zinc. Were determined water-soluble vitamins B complex vitamins (B1, B2, B3 and B6) and ascorbic acid. It was found a total saponins content of 1.17 g/100 g of sample db, with anti-inflammatory activity. A total of nine essential and eight non-essential amino acids, of the 20 necessary for health, were determined in aguamiel. An additional characteristic was the phenolic compounds content, which exhibited antioxidant activity against DPPH and ABTS. The degree of polymerization of fructooligosaccharides was 5-10 determined by MALDI-TOF. The effect fructooligosaccharides prebiotics during in vitro fermentation and the quantification of shortchain fatty acids were evaluated. © 2015, Universidad Autonoma Metropolitana Iztapalapa. All rights reserved. Source


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POLITICA El Instituto Tecnologico del Altiplano de Tlaxcala establece el compromiso de implementar todos sus procesos, orientandolos hacia la satisfaccion de sus clientes sustentada en la Calidad del Proceso Educativo, para cumplir con sus requisitos, mediante la eficacia de un Sistema de Gestion de la Calidad y de mejora continua, conforme a la norma ISO 9001:2008/NMX-CC-9001-IMNC-2008

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