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Santiago de Querétaro, Mexico

Ramirez J.A.,Autonomous University of Tamaulipas | Castanon-Rodriguez J.F.,Autonomous University of Tamaulipas | Velazquez G.,CICATA Queretaro | Montoya P.,Subdireccion de Desarrollo de Metodos | And 2 more authors.
Food and Bioprocess Technology | Year: 2012

Anastrepha obliqua Macquart (Diptera: Tephritidae) is an important insect infesting fruit in Mexico and other Latin American countries along with Anastrepha ludens. Recently, high-pressure processing (HPP) has been reported as a quarantine method for different fruit flies. However, more studies are needed to determine the resistance of the most infesting insects to this treatment. The present study was carried out to determine the effect of HPP on the survivorship of eggs and larvae of A. obliqua. Eggs and larvae were pressurized at 50-90 MPa for 0-9 min at 0 or 45°C. Hatching was recorded for 1-, 2-, and 3-day-old pressurized eggs. The percentage of survival was also registered for pressurized larvae (first, second, and third instars). Furthermore, third instars were studied for their ability to pupate. The effect of time and pressure level at near-freezing temperatures or warm temperatures on the egg hatching and survival of larvae were discussed. These results showed that HPP at 90 MPa for 9 min at 0 or 45°C destroys all eggs and larvae of A. obliqua, indicating that this process could be useful as a quarantine method for infested fruits. © 2011 Springer Science + Business Media, LLC.

Ruiz-Montanez G.,Technological Institute of Tepic | Ragazzo-Sanchez J.A.,Technological Institute of Tepic | Calderon-Santoyo M.,Technological Institute of Tepic | Velazquez-De La Cruz G.,CICATA Queretaro | And 2 more authors.
Food Chemistry | Year: 2014

Bioactive compounds have become very important in the food and pharmaceutical markets leading research interests seeking efficient methods for extracting these bioactive substances. The objective of this research is to implement preparative scale obtention of mangiferin and lupeol from mango fruit (Mangifera indica L.) of autochthonous and Ataulfo varieties grown in Nayarit, using emerging extraction techniques. Five extraction techniques were evaluated: maceration, Soxhlet, sonication (UAE), microwave (MAE) and high hydrostatic pressures (HHP). Two maturity stages (physiological and consumption) as well as peel and fruit pulp were evaluated for preparative scale implementation. Peels from Ataulfo mango at consumption maturity stage can be considered as a source of mangiferin and lupeol using the UEA method as it improves extraction efficiency by increasing yield and shortening time. © 2014 Elsevier Masson SAS. All rights reserved.

Menera-Lopez I.,Autonomous University of Coahuila | Gaytan-Martinez M.,CINVESTAV | Gaytan-Martinez M.,Autonomous University of Queretaro | Reyes-Vega M.L.,Autonomous University of Coahuila | And 2 more authors.
CYTA - Journal of Food | Year: 2013

Traditional nixtamalization is performed to produce corn flour and tortillas. This process has undergone several modifications for industrialization purposes. Extrusion is an industrially used process for nixtamalization and ohmic heating may be considered an alternative. For this study, a continuous ohmic heater was used to produce nixtamalized corn flour and the effects of the process parameters - process temperature, feed moisture, and screw speed - on the physicochemical and textural properties of dough and tortilla were reviewed. Data showed that the process temperature had a greater effect than the feed moisture on the resulting product, while screw speed did not appear to have any significant influence on this. Tortillas showed good quality characteristics because of good water absorption and retention during the process. The products obtained by continuous ohmic heating process show quality characteristics similar to those present in traditional corn flour products. © 2013 Taylor & Francis.

Gutierrez J.C.,CICATA Queretaro | Lozano A.,CICATA Queretaro | Manzano A.,CINVESTAV | Flores M.S.,CICATA Queretaro
Fibres and Textiles in Eastern Europe | Year: 2016

The use of composite materials has spread to different applications among which, those using thin sheet plates subjected to biaxial loads are commonly used in the car and aerospace industries. Hence, there is need of a reliable specimen to test these materials under biaxial loads. This reliability depends on measurements that are accurate and repeatable. Thus these measurements depend on the proper design of specimens. This paper reviews the development of cruciform specimens of carbon fibre composite materials and how the geometric shape has evolved. Based on this review, a new geometric shape is proposed. This improvement is based on numerical analysis of the specimen and tests results of experimental measurements carried out using a four piston rig in an orthogonal arrangement. Deformation is measured in the centre of the specimen using strain gauges. By obtaining the principal stresses, it was found that maximum stresses occur in the centre of the specimen. © 2016, Institute of Biopolymers and Chemical Fibres. All rights reserved.

Perez-Gamboa M.,CICATA Queretaro | Nieto-Perez M.,CICATA Queretaro | Mahajan S.,University of Texas at Austin | Valanju P.,University of Texas at Austin | And 2 more authors.
Progress in Nuclear Energy | Year: 2015

Abstract Nuclear fuel cycles based on thorium are gaining close attention due to its higher availability and more homogenous geographical distribution. Thorium cycles, likely to be less problematic with regard to waste generation and weapons proliferation, will extend the availability of nuclear fuel by hundreds/thousands of years. The principal Th cycle involves the transmutation of the fertile 232Th isotope into the fissile isotope 233U by means of neutron capture. In the present study, the coupled operation of a hybrid fission/fusion system and a standard thermal reactor is analyzed. Using the MCNP neutronic transport code, the behavior for 233U consumption/generation in both systems as a function of Th/U feed ratio to each reactor is analyzed. The useful composition range for the feed to the thermal reactor was found to be between 1.7% and 2.25%; within these range, breeder input enrichment can be found which causes the rate of consumption and generation of 233U to be identical. Under this condition, from the point of view of the fissile isotope, the cycle is closed, with no net generation or consumption. The cycle requires a 232Th input to compensate the amount spent on breeding the fissile material; for the range of interest, this varies between 0 and 35% of the total mass flow in the breeder leg of the cycle. © 2015 Elsevier Ltd. All rights reserved.

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