National Politecnic Institute

Colonia Lindavista, Mexico

National Politecnic Institute

Colonia Lindavista, Mexico
Time filter
Source Type

Valderrama-Bravo C.,National Autonomous University of Mexico | Valderrama-Bravo C.,National Politecnic Institute | Dominguez-Pacheco A.,National Politecnic Institute | Hernandez-Aguilar C.,National Politecnic Institute | And 5 more authors.
International Agrophysics | Year: 2017

In maize plant breeding aimed at producing a hybrid, it is necessary to characterize the parents and hybrids by their agronomic aspects and grain quality so that the processing industry may offer consumers a quality product and also improve its efficiency. This study evaluated the viscoelastic parameters of masa and the chemical and texture properties of tortillas obtained from parent lines (M-54, M55, and CML-242), two single crosses (M54xM55 and M55xM54), and one hybrid (H-70). The morphology of the maize grains and tortillas was analyzed using scanning electron microscopy. The firmness of masa obtained from CML-242 and H-70 maize was higher than that from the other maize genotypes. M-54 tortillas showed the lowest crude fiber content. Otherwise, tortillas obtained from the M55xM54 hard grain had the lowest fat content and extensibility, while H-70 tortillas showed an intermediate breaking point and extensibility. M-54 and M54xM55 tortillas were softer due to their more swollen starch granules. In contrast, rigid tortillas were obtained from CML-242 and H-70. Grain hardness causes different morphology in starch and tortilla of maize genotypes. However, grain hardness did not influence the characteristics of texture in tortillas. © 2017 C. Valderrama-Bravo et al., published by De Gruyter Open.

Vargas-Becerril N.,National Politecnic Institute | Patino-Carachure C.,UNACAR Campus III | Rodriguez-Lorenzo L.M.,CSIC - Institute of Polymer Science and Technology | Rodriguez-Lorenzo L.M.,CIBER ISCIII | Tellez-Jurado L.,National Politecnic Institute
Ceramics International | Year: 2013

The preparation of apatite-alendronate hybrid materials by reactive milling is proposed in this work. Calcium phosphate compounds of various compositions have been associated to bisphosphonates and found suitable for local application with release kinetics of the drug compatible with the inhibition of bone resorption. Hybrid compounds have been obtained by reactive milling. The compositions used were: AP(X-100), Alendronate(X) where X=7 and X=15. An interaction between the hydroxyl group of the apatite and the amine group of alendronate can be identified with FTIR and enables to confirm the formation of the hybrids. The incorporation of the alendronate hinders the growing of the apatite crystals resulting in smaller coherent domains of diffraction for the apatite phase. © 2012 Elsevier Ltd and Techna Group S.r.l.

Jimenez-Balderas F.-J.,Mexican Institute of Social Security | Garcia-Jaimes J.,Mexican Institute of Social Security | Rios R.,Mexican Institute of Social Security | Zonana-Nacach A.,Regional General Hospital 20 | And 4 more authors.
Korean journal of ophthalmology : KJO | Year: 2014

PURPOSE: Since few reports had been published on the prevalence of toxocariasis in ankylosing spondylitis (AS) patients with acute non-granulomatous anterior uveitis (ANGAU), the aim of this work was to determine the presence of antibodies against Toxocara canis in AS patients with ANGAU.METHODS: Thirty-six patients (14 female and 22 male) with AS were enrolled in the study. The history of ANGAU was accepted only if diagnosed by an ophthalmologist. The detection of IgG antibodies to T. canis was determined by enzyme-linked immunosorbent assay. In addition, antibodies to Ascaris lumbricoides were also tested to verify non-specific reactions.RESULTS: The prevalence of ANGAU in the AS patients was 58% (21 / 36), and 38% (8 / 21) of the patients with ANGAU were positive for antibodies to Toxocara, while 7% (1 / 15) of AS patients without ANGAU were positive for T. canis (p = 0.038, two tails; mid-p exact). No antibodies were detected to A. lumbricoides antigens in the serum samples of patients with AS.CONCLUSIONS: These data suggest that the seroprevalence of antibodies to T. canis is high in Mexican patients with AS-associated uveitis, suggesting a chronic asymptomatic toxocariosis, which could be associated with the pathogenesis of ANGAU; however, further larger-scale studies are needed to confirm this observation.

Arenas-Ocampol M.,CeProBi IPN. Carr. Yautepec Jojutla | Alamilla-Beltran L.,National Politecnic Institute | Vanegas-Espinoza P.E.,CeProBi IPN. Carr. Yautepec Jojutla | Camacho-Diaz B.H.,CeProBi IPN. Carr. Yautepec Jojutla | And 3 more authors.
International Agrophysics | Year: 2012

Inthiswork,morphologyofBetavulgarisL.cells permeabilized with 0.7 mM of Triton X-100® was evaluated using digital image processing and concepts of fractal dimension (perimeter- area relations). Important morphometric changes were found when the contact-time with chemical agent was increased. The size of cells decreased, the cells lost the roundness and their shape was more sinuous; this behaviour was a result of a probable shrinkage caused by the excess of exposure with the permeabili- zation agent. Morphology of B. vulgaris cells after permeabili- zation, exhibited a fractal nature since the slope of the ratio of the logarithm of the perimeter vs logarithm of the area was higher than unit. Fractal geometry of the cell morphology was affected as a re- sult of the exposure to Triton X-100®. Those changes can be attri- buted to the loss of turgor and structure of the cell wall. © 2012 Institute of Agrophysics, Polish Academy of Sciences.

Zepeda R.B.,National Politecnic Institute | Hernandez C.A.,National Politecnic Institute | Suazo F.L.,Chapingo Autonomous University | Dominguez A.P.,National Politecnic Institute | And 3 more authors.
International Agrophysics | Year: 2011

In order to improve the physical characteristics of maize grain and, consequently, those of maize tortilla, a basic food in Latin American countries, using environment-friendly techniques, the effect of electromagnetic irradiation on physical properties of grain, nixtamal, and tortilla of maize varieties was assessed as well as the response of every variety. Grain was exposed to an electromagnetic field of 480 mT intensity induced by a solenoid. There were differences (p£0.05) among maize varieties and times of exposure to the electromagnetic field for hectolitre mass, flotation index, mass of 100 kernels, colour of kernel and tortilla (reflectance in%), retained pericarp, loss of solids, and firmness. On average, flotation index of grain, retained pericarp and colour of tortilla diminished by 15.5, 11.0, and 3.1%, respectively, at 15min of exposure, while firmness and elongation of tortilla increased by 39.4 and 9.3% with respect to the control. Kernel flotation index in HS2 diminished by 39.1% at 15 min, whereas in AS722 and CAZ there was no significant change compared to 0 min. Likewise, in CAZ and HS2 the colour of tortilla decreased by 4.9 and 6.0%, respectively, at 15 min. An increment of 2.6 and 4.5% in AS722 was observed for mass of 100 kernels and colour of grain compared to the control, at 10 min exposure to electromagnetic field. Each variety responded differently to electromagnetic field according to the structure and chemical composition of the grain. © 2011 Institute of Agrophysics, Polish Academy of Sciences.

Zepeda-Bautista R.,National Politecnic Institute | Hernandez-Aguilar C.,National Politecnic Institute | Dominguez-Pacheco A.,National Politecnic Institute | Cruz-Orea A.,National Politecnic Institute | And 2 more authors.
International Agrophysics | Year: 2010

In order to increase maize productivity with environmentally friendly techniques, the effect of electromagnetic irradiation on seed vigour of maize hybrids, as well as the response of each genotype were assessed. There were differences (p≤0.05) between hybrids and electromagnetic field doses for emergence rate on the ninth day (VE9) and the dry mass of aerial part (PSP). With 15 min of electromagnetic field, VE9 and PSP increased by 14.96 and 14.38%, respectively, compared to the control. With 3 min, VE9 in hybrids San Jeronimo and San Juan increased by 16 and 19%, respectively, and with 6 min only 4 and 9% with respect to the control. In PSP, San Jeronimo grew by 16% with 3 min, and San Juan by 21% with 9 min, in San Jose there was no significant increment, compared to the control. © 2010 Institute of Agrophysics, Polish Academy of Sciences.

Loading National Politecnic Institute collaborators
Loading National Politecnic Institute collaborators