University of Queretaro

San Juan del Río, Mexico

University of Queretaro

San Juan del Río, Mexico
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Aubert M.,French National Center for Space Studies | Baghdadi N.N.,IRSTEA | Zribi M.,CNRS Center for the Study of the Biosphere from Space | Ose K.,IRSTEA | And 4 more authors.
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2013

TerraSAR-X data are processed for an 'operational' mapping of bare soils moisture in agricultural areas. Empirical relationships between TerraSAR-X signal and soil moisture were established and validated over different North European agricultural study sites. The results show that the mean error on the soil moisture estimation is less than 4% regardless of the TerraSAR-X configuration (incidence angle, polarization) and the soil surface characteristics (soil surface roughness, soil composition). Furthermore, the potential of TerraSAR-X data (signal, texture features) to discriminate bare soils from other land cover classes in an agricultural watershed was evaluated. The mean signal backscattered from bare soils can be easily differentiated from signals from other land cover classes when the neighboring plots are covered by fully developed crops. This was observed regardless of the TerraSAR-X configuration and the soil moisture conditions. When neighboring plots are covered by early growth crops, a TerraSAR-X image acquired under wet conditions can be useful for discriminating bare soils. Bare soil masks were calculated by object-oriented classifications of mono-configuration TerraSAR-X data. The overall accuracies of the bare soils mapping were higher than 84% for validation based on object and pixel. The bare soils mapping method and the soil moisture relationships were applied to TerraSAR-X images to generate soil moisture maps. The results show that TerraSAR-X sensors provide useful data for monitoring the spatial variations of soil moisture at the within-plot scale. The methods of bare soils moisture mapping developed in this paper can be used in operational applications in agriculture, and hydrology. © 2008-2012 IEEE.


Roy A.,Pennsylvania State University | Kordas K.,Pennsylvania State University | Lopez P.,National Institute of Medical science and Nutrition | Rosado J.L.,University of Queretaro | And 3 more authors.
Environmental Research | Year: 2011

Previous studies suggest adverse effects of arsenic exposure on children's cognitive function. In this study, we examined the potential association between arsenic exposure and children's behavior. Five hundred and twenty-six children, 6-7 years old, living near a metal foundry in Torreón, Mexico, participated in the study. Arsenic exposure was measured as total urinary arsenic (UAs) and arsenic metabolites-monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) concentrations. Children's behavior was assessed by Conners Behavior Rating Scales for parents and teachers. The median (interquartile range) concentrations of UAs, MMA and DMA were 55.2 (39.7), 6.7 (5.9) and 39.3 (28.5) γg/L, respectively. The mean behavior scores from parent and teacher ratings were within the clinically normal range (T<65). The relationship between behavior and urinary arsenic was modeled in linear and logistic regression models, with UAs, MMA and DMA tested in separate models and entered as quartiles. No significant association was found between any measure of urinary arsenic and parent ratings of behavior. However, higher UAs was modestly associated with higher scores on the Oppositional, Cognitive Problems and ADHD sub-scales of the teacher ratings; a dose-response relationship was not established between UAs quartiles and behavior. Higher urinary DMA was associated with higher ratings on the Oppositional, Cognitive Problems and ADHD Index by teachers. The associations between UAs and behavior became statistically non-significant after adjustment for the Peabody Picture Vocabulary Test scores, suggesting that the harmful effects of arsenic on behavior may be secondary to arsenic-induced cognitive deficits. These data suggest a potential adverse association between arsenic and children's behavior and indicate a need to further study the effects of arsenic and arsenic metabolites on neurobehavioral outcomes in children. © 2011 Elsevier Inc.


PubMed | Latin University, University of Queretaro, Autonomous University of San Luis Potosi and National University of Cordoba
Type: Journal Article | Journal: Journal of endodontics | Year: 2016

Materials such as calcium hydroxide paste and mineral trioxide aggregate are used in apexification treatment of immature permanent teeth, but the search forimproved materials with higher characteristics of biocompatibility results in different materials. Biodentine is a tricalcium silicate cement that possesses adequate handling characteristics and acceptable mechanical and bioactivity properties. This report describes the case of a 9-year-old boy who was referred to the Department of Dental Clinic of Quertaro Autonomous University of Mexico. One month prior the patient had suffered a dental trauma of his upper left central incisor and had been treated by another dentist. The clinical diagnosis was previously initiated therapy and symptomatic apical periodontitis. The treatment was apexification with Biodentine. At follow-ups performed at 3, 6, and 18months after treatment the tooth was asymptomatic. The cone-beam computed tomography scan at 18-month postoperative follow-up revealed continuity of periodontal ligament space, absence of periapical rarefactions, and a thin layer of calcified tissue formed apical to the Biodentine barrier. On the basis of sealing ability and biocompatibility, apexification treatment with Biodentine was applied in the present case report. The favorable clinical and radiographic outcome in this case demonstrated that Biodentine may be an efficient alternative to the conventional apexification materials.


Madani B.,University Putra Malaysia | Mirshekari A.,Yasouj University | Yahia E.,University of Queretaro
Journal of the Science of Food and Agriculture | Year: 2015

BACKGROUND: There have been no reports on the effects of preharvest calcium application on anthracnose disease severity, antioxidant activity and cellular changes during ambient storage of papaya, and therefore the objective of this study was to investigate these effects. RESULTS: Higher calcium concentrations (1.5 and 2% w/v) increased calcium concentration in the peel and pulp tissues, maintained firmness, and reduced anthracnose incidence and severity. While leakage of calcium-treated fruit was lower for 1.5 and 2% calcium treatments compared to the control, microscopic results confirmed that pulp cell wall thickness was higher after 6 days in storage, for the 2% calcium treatment compared to the control. Calcium-treated fruit also had higher total antioxidant activity and total phenolic compounds during storage. CONCLUSION: Calcium chloride, especially at higher concentrations, is effective in maintaining papaya fruit quality during ambient storage. © 2015 Society of Chemical Industry Copyright © 2015 Society of Chemical Industry October 2015 10.1002/jsfa.7462 Research Article Research Articles © 2015 Society of Chemical Industry.


PubMed | University Putra Malaysia, Yasouj University and University of Queretaro
Type: Journal Article | Journal: Journal of the science of food and agriculture | Year: 2016

There have been no reports on the effects of preharvest calcium application on anthracnose disease severity, antioxidant activity and cellular changes during ambient storage of papaya, and therefore the objective of this study was to investigate these effects.Higher calcium concentrations (1.5 and 2% w/v) increased calcium concentration in the peel and pulp tissues, maintained firmness, and reduced anthracnose incidence and severity. While leakage of calcium-treated fruit was lower for 1.5 and 2% calcium treatments compared to the control, microscopic results confirmed that pulp cell wall thickness was higher after 6 days in storage, for the 2% calcium treatment compared to the control. Calcium-treated fruit also had higher total antioxidant activity and total phenolic compounds during storage.Calcium chloride, especially at higher concentrations, is effective in maintaining papaya fruit quality during ambient storage. 2015 Society of Chemical Industry.


Gonzalez-Sosa E.,IRSTEA | Gonzalez-Sosa E.,University Of Queretaro | Braud I.,IRSTEA | Dehotin J.,IRSTEA | And 8 more authors.
Hydrological Processes | Year: 2010

The hydraulic properties of the topsoil control the partition of rainfall into infiltration and runoff at the soil surface. They must be characterized for distributed hydrological modelling. This study presents the results of a field campaign documenting topsoil hydraulic properties in a small French suburban catchment (7 km2) located near Lyon, France. Two types of infiltration tests were performed: single ring infiltration tests under positive head and tension-disk infiltration using a mini-disk. Both categories were processed using the BEST-Beerkan Estimation of Soil Transfer parameters-method to derive parameters describing the retention and hydraulic conductivity curves. Dry bulk density and particle size data were also sampled. Almost all the topsoils were found to belong to the sandy loam soil class. No significant differences in hydraulic properties were found in terms of pedologic units, but the results showed a high impact of land use on these properties. The lowest dry bulk density values were obtained in forested soils with the highest organic matter content. Permanent pasture soils showed intermediate values, whereas the highest values were encountered in cultivated lands. For saturated hydraulic conductivity, the highest values were found in broad-leaved forests and small woods. The complementary use of tension-disk and positive head infiltration tests highlighted a sharp increase of hydraulic conductivity between near saturation and saturated conditions, attributed to macroporosity effect. The ratio of median saturated hydraulic conductivity to median hydraulic conductivity at a pressure of -20 mm of water was about 50. The study suggests that soil texture, such as used in most pedo-transfer functions, might not be sufficient to properly map the variability of soil hydraulic properties. Land use information should be considered in the parameterizations of topsoil within hydrological models to better represent in situ conditions, as illustrated in the paper. © 2010 John Wiley & Sons, Ltd.


Mendoza-Perez J.C.S.,University of Queretaro | Rico-Garcia E.,University of Queretaro | Flores-Corona L.E.,National Center for Disaster Prevention
Indian Journal of Engineering and Materials Sciences | Year: 2011

The aim of this study is to evaluate the effect of connector density on reinforced masonry wallettes. Firstly, the properties of bricks and mortar are determined. Six densities of connectors and unreinforced specimens are tested in diagonal compression. For each density at least seven probes are tested. Results show that no difference (p ≤ 0.05, means that results are only 5% likely or less) is found for connector density, concluding that connector density is not relevant to increase the shear capacity of reinforced masonry. However, all reinforced wallettes show a ductile failure.


News Article | November 10, 2015
Site: phys.org

The device generates sensations of heat, cold, vibration and roughness of objects in a virtual reality simulation. The gloves are complemented with Oculus Rift glasses. Leap Motion software was also implemented to identify the user's hands in different simulations. The development team at Vivoxie created two demos with the Unity platform, used in the creation of video games for consoles or the web, said Enya Vera, responsible for the area of business intelligence at the company. One of the game demos simulates the interior of a building where the user must perform small tasks, for example, hurling thunderbolts with their hands to destroy a number of targets, opening the doors of an elevator, and shooting fireballs. Users feel their fingers burn or freeze when lifting a piece of ice, explained Vera. With this trial version of the game, the Vivoxie team attended the Gamescom 2015 in Germany, where they presented the first PowerClaw prototype, which has three actuators in the thumb, index and middle fingers that transmit different sensations. The aim is to offer Power Claw as a peripheral or accessory device to be used in different applications, not limited to video games; for example, education, medicine or engineering apps. First, Vivoxie will make its own apps to work with the gloves. Then the team will seek partnerships with other companies. However, it is necessary to develop an API and developer kit before discussing a possible alliance. The medium-term goal is for the glove to work with both the company's applications as well as those created by other developers. Therefore, API and SDK files must be released to the public, inviting developers to generate new apps that require the Power Claw. Moreover, it is noteworthy that the device has limited power management, and the actuators consume too much electricity when switching between a hot and a cold sensation, so it is not yet feasible to use them wirelessly. The project had the scientific backing of the University of Queretaro and Puebla (center states of Mexico) and from the Western Institute of Technology and Higher Education (ITESO). The product will be ready by mid-2016, but one can already pre-order it from their web site (www.vivoxie.com) for $399. Explore further: Gamers feel the glove: Student team creates feedback device for the hand for virtual environments (w/ Video)


Tovar A.R.,University of Queretaro | Caamao M.D.C.,University of Queretaro | Garcia-Padilla S.,Cindetec A.C | Garcia O.P.,University of Queretaro | And 3 more authors.
Nutrition Journal | Year: 2012

Background: Obesity is a major public health problem in many poor countries where micronutrient deficiencies are prevalent. A partial meal replacement may be an effective strategy to decrease obesity and increase micronutrient intake in such populations. The objective was to evaluate the efficacy of a partial meal replacement with and without inulin on weight reduction, blood lipids and micronutrients intake in obese Mexican women. Methods. In a randomized controlled clinical trial 144 women (18-50 y) with BMI25kg/m2, were allocated into one of the following treatments during 3months: 1) Two doses/d of a partial meal replacement (PMR), 2) Two doses/d of PMR with inulin (PMR+I), 3) Two doses/d of 5g of inulin (INU) and 4) Control group (CON). All groups received a low calorie diet (LCD). Weight, height, hip and waist circumference were measured every 2weeks and body composition, lipids and glucose concentration and nutrient intake were assessed at baseline and after 3months. Results: All groups significantly reduced weight, BMI, waist and hip circumference. Differences between groups were only observed in BMI and weight adjusted changes: At 45days PMR group lost more weight than INU and CON groups by 0.9 and 1.2Kg, respectively. At 60days, PMR+I and PMR groups lost more weight than in INU by 0.7 and 1Kg, respectively. Subjects in PMR, PMR+I and INU significantly decreased triglycerides. Energy intake was reduced in all groups. Fiber intake increased in PMR+I and INU groups. Some minerals and vitamins intakes were higher in PMR and PMR+I compared with INU and CON groups. Conclusion: Inclusion of PMR with and without inulin to a LCD had no additional effect on weight reduction than a LCD alone but reduced triglycerides and improved intake of micronutrients during caloric restriction. PMR could be a good alternative for obese populations with micronutrient deficiencies. ClinicalTrials.Gov ID. NCT01505023. © 2012 Tovar et al.; licensee BioMed Central Ltd.


Lomas-Soria C.,University of Queretaro | Ramos-Gomez M.,University of Queretaro | Guevara-Olvera L.,Technological Institute of Celaya | Guevara-Gonzalez R.,University of Queretaro | And 3 more authors.
International Journal of Molecular Sciences | Year: 2011

Diabetic nephropathy (DN) is a major complication of diabetes and is caused by an imbalance in the expression of certain genes that activate or inhibit vital cellular functions of kidney. Despite several recent advances, the pathogenesis of DN remains far from clear, suggesting the need to carry out studies identifying molecular aspects, such as gene expression, that could play a key role in the development of DN. There are several techniques to analyze transcriptome in living organisms. In this study, the suppression subtractive hybridization (SSH) method was used to generate up- and down-regulated subtracted cDNA libraries in the kidney of streptozotocin (STZ)-induced diabetic rats. Northern-blot analysis was used to confirm differential expression ratios from the obtained SSH clones to identify genes related to DN. 400 unique SSH clones were randomly chosen from the two subtraction libraries (200 of each) and verified as differentially expressed. According to blast screening and functional annotation, 20.2% and 20.9% of genes were related to metabolism proteins, 9% and 3.6% to transporters and channels, 16% and 6.3% to transcription factors, 19% and 17.2% to hypothetical proteins, and finally 24.1 and 17.2% to unknown genes, from the down- and up-regulated libraries, respectively. The down- and up-regulated cDNA libraries differentially expressed in the kidney of STZ diabetic rats have been successfully constructed and some identified genes could be highly important in DN. © 2011 by the authors; licensee MDPI, Basel, Switzerland.

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