Ciudad de Villa de Alvarez, Mexico
Ciudad de Villa de Alvarez, Mexico

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Suarez-Hernandez A.M.,Autonomous University of Baja California | Grimaldo-Juarez O.,Autonomous University of Baja California | Garcia-Lopez A.M.,Autonomous University of Baja California | Gonzalez-Mendoza D.,Autonomous University of Baja California | Huitron-Ramirez M.V.,Technological Institute of Colima
Revista Chapingo, Serie Horticultura | Year: 2017

The cultivation of grafted watermelon has spread to different parts of the world in order to improve production under adverse conditions; however, this technique may alter the quality of the fruit. Therefore, the aim of this work was to evaluate the effect of eight rootstocks, six native Lagenaria siceraria varieties (L43, L46, L48, L50, L54 and L56) and two commercial squash varieties (Super shintosa and TZ 148), in addition to the control plant (without grafting), on the postharvest quality of watermelon variety Tri-X 313. The experimental design was completely randomized with a factorial arrangement and three replicates per treatment. The evaluated variables were fruit weight, firmness, total soluble solids and pulp color. The post-harvest quality of the fruits was not modified by grafting; however, it increased fruit weight by 44 %, except for L50. Pulp firmness was favored 29 % with Super shintosa. The °Brix increased 7 % with L54 and L56. Pulp color was slightly affected with Lagenaria by presenting a lower-intensity red color. The quality of the fruits, during the 14 days of storage, changed in firmness, °Brix and pulp color. The L43, L46 and L48 rootstocks were identified as the most promising to reduce weight loss, retain firmness and maintain pulp color. On the other hand, L54 and L56 promoted °Brix content, but slightly diminished pulp color.


Alvarez-Hernandez J.C.,Roque Institute of Technology | Castellanos-Ramos J.Z.,Roque Institute of Technology | Aguirre-Mancilla C.L.,Roque Institute of Technology | Huitron-Ramirez M.V.,Technological Institute of Colima | Camacho-Ferre F.,University of Almeria
Ciencia e Agrotecnologia | Year: 2015

Cucurbita maxima x Cucurbita moschata rootstock are used to prevent infection with Fusarium oxysporum f. sp. niveum in watermelon production; however, this rootstock is not effective against nematode attack. Because of their vigor, the grafted plants can be planted at lower plant densities than the non-grafted plants. The tolerance to Fusarium oxysporum f. sp. niveum and Meloidogyne incognita was assessed in watermelon plants grafted onto a hybrid of Citrullus lanatus cv Robusta or the Cucurbita maxima x Cucurbita moschata cv Super Shintoza rootstocks. The densities of plants were 2083 and 4166 plants ha-1. Non-grafted watermelons were the controls. The Crunchy Red and Sangría watermelon cultivars were used as the scions, it the latter as a pollinator. The experiments were performed for two production cycles in soils infested with Fusarium oxysporum f. sp. niveum and Meloidogyne incognita. The incidence of Fusarium oxysporum f. sp. niveum was significantly greater in the non-grafted than in the grafted plants. The grafted plants presented similar resistance to Fusarium regardless of the rootstock. The root-knot galling index for Meloidogyne incognita was significantly lower in plants grafted onto Citrullus lanatus cv Robusta than onto the other rootstock. The yields of plants grafted onto Citrullus lanatus cv Robusta grown at both plant densities were significantly higher than in the other treatments. © 2015 Federal University of Lavras. All rights reserved.


Barbosa Leon H.,Technological Institute of Colima | Garcia-Penalvo F.J.,University of Salamanca | Rodriguez-Conde M.J.,University of Salamanca | Morales E.M.,University of Salamanca | De Pablos P.O.,University of Oviedo
International Journal of Distance Education Technologies | Year: 2012

Evaluation is a key element in formal education processes; it must be constructed in a way that the item questions within help students understand by adapting them to the learning style as well. The focus of the present research work specifically in the convenience to adapt an associated multimedia material in each single question besides the traditional adaptation process based on the level of difficulty established for an item; all this in order to increase the final test score of the student. The proposed approach tries to solve this by designing and constructing an authoring tool to construct adaptive objective tests and an a prototype test to evaluate if a test that looks to adapt a multimedia content to the learning style could help to increase cited score of the student. The results are significant because it is able to conclude that adapted test based on the student's learning style slightly increased the final score. Copyright © 2012, IGI Global.


Ricardez-Salinas M.,UNIDO SEMARNAT | Huitron-Ramirez M.V.,Technological Institute of Colima | Tello-Marquina J.C.,University of Almeria | Camacho-Ferre F.,University of Almeria
Scientia Horticulturae | Year: 2010

One of the major challenges of melon (Cucumis melo L.) yield is the decrease of fruit yield and quality caused by soil diseases. Soil disinfection with methyl bromide (MB) has been used to prevent soil-borne diseases damage; however, use of MB is being restricted because this substance damages the ozone layer. Searching for new MB alternatives, field experiments were carried out in open fields in soils infested with Fusarium oxysporum f. sp. melonis, Olpidium bornovanus, and Melon Necrotic Spot Virus (MNSV) in Colima, Mexico, where melons had only been grown previously using soil fumigation with MB. Yield and quality of melon cultivar Cruiser F1 (Harris Moran seed company) grafted on two rootstocks of Cucurbita maxima Duchesne × Cucurbita moschata Duchesne (" RS841" ; Séminis seed company and " Shintosa Camelforce" ; Nunhens seed company) were evaluated during two consecutive years. Each experiment had five treatments, two of which with non-grafted plants at a density of 18,519. plants/ha, with and without MB fumigation. The other three treatments consisted of grafted plants in non-fumigated soil with plant densities of 14,815, 11,111, and 9260. plants/ha. The use of melon grafted on " RS841" and " Shintosa Camelforce" rootstocks significantly increased the average fruit weight and the total yield of melons in soil without the need for MB. Grafting may be considered an alternative to MB fumigation. With the use of grafted melon plants, planting density may be reduced by 60%, obtaining higher yields than those obtained from non-grafted plants grown on fumigated land. Fruits harvested from grafted plants had equal firmness than those harvested from non-grafted plants, without affecting the content of soluble solids. © 2010 Elsevier B.V.


Lopez-Valdovinos M.P.,Technological Institute of Colima | Rojas N.,National University of Colombia | Avila T.,National University of Colombia | Bernal C.,GESOLTEC
Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA | Year: 2015

Bogota has undertaken major transformations of its public transportation system in the last 15 yr, building a BRT system and a network of 340 km of bicycle paths. Ultrafine particulate (UFP) concentrations in different transportation modes in Bogota were studied. Along Calle 26, the highest exposure occurred in the car mode, but only in one direction, from West to East. The lowest exposure occurred in the BRT bus mode, in both directions. Pedestrians and cyclists were exposed to intermediate concentrations, although extremely high sudden peaks occur for pedestrians, reaching over 1 million particles/cu m. High peaks occur also for cyclists and car drivers. There were significant differences in the UFP concentration distributions between directions in all transport modes, suggesting that a direction-related factor plays a role in UFP concentrations. Concentrations, and therefore exposure, are strongly affected by environmental conditions, road location, road width and traffic congestion at the time of the measurement. This is an abstract of a paper presented at the 108th AWMA Annual Conference and Exhibition (Raleigh, NC 6/22-25/2015).


Lopez-Martin C.,University of Guadalajara | Kalichanin-Balich I.,University of Guadalajara | Ulloa-Cazarez R.L.,University of Guadalajara | Garcia-Diaz N.,University of Colima | Garcia-Diaz N.,Technological Institute of Colima
International Journal of Engineering Education | Year: 2016

Prediction techniques have been applied for predicting dependent variables related to Higher Education students such as dropout, grades, course selection, and satisfaction. In this research, we propose a prediction technique for predicting the effort of software projects individually developed by graduate students. In accordance with the complexity of a software project, it can be developed among teams, by a team or even at individual level. The teaching and training about development effort prediction of software projects represents a concern in environments related to academy and industry because underprediction causes cost overruns, whereas overprediction often involves missed financial opportunities. Effort prediction techniques of individually developed projects have mainly been based on expert judgment or based on mathematical models. This research proposes the application of a mathematical model termed Radial Basis function Neural Network (RBFNN). The hypothesis to be tested is the following: effort prediction accuracy of a RBFNN is statistically better than that obtained from a Multiple Linear Regression (MLR). The projects were developed by following a disciplined development process in controlled environments. The RBFNNandMLRwere trained from a data set of 328 projects developed by 82 students between the years 2005 and 2010, then, the models were tested using a data set of 116 projects developed by 29 students between the years 2011 and first semester of 2012. Results suggest that aRBFNNhaving as independent variables new and changed code, reused code and programming language experience of students can be used at the 95.0% confidence level for predicting the development effort of individual projects when they have been developed based upon a disciplined process in academic environments. © 2016 TEMPUS Publications.


Trujillo X.,University of Colima | Sanchez-Pastor E.,University of Colima | Andrade F.,Technological Institute of Colima | Huerta M.,University of Colima
Journal of Membrane Biology | Year: 2014

We investigated the effects of cannabinoids on acetylcholine (ACh) or choline contractures in slow skeletal muscle fibers from Rana pipiens. Bundles of cruralis muscle fibers were incubated with the cannabinoid receptor 1 (CB1) agonist, arachidonylcyclopropylamide (ACPA), which diminished the maximum isometric tension by 10 % and the total tension by 5 % of the ACh contracture, and 40 and 22 % of the choline contracture, respectively. Preincubation with the CB1 antagonist, AM281, or with pertussis toxin (PTX) completely blocked the effect of ACPA on the ACh contracture. On the other hand, the decrease in choline contracture by ACPA was only partially blocked by AM281 (~16 % decrease), PTX (20 %), or by dantrolene (~46 %). Our results show that ACPA modulates ACh and choline contractures, and suggest that this effect involves the participation of CB1, the ACh receptor, and -RyR in ACh contractures. For choline contractures, ACPA may also be acting through cannabinoid receptor-independent mechanisms. © 2013 Springer Science+Business Media New York.


Trujillo X.,University of Colima | Sanchez-Pastor E.,University of Colima | Andrade F.,Technological Institute of Colima | Huerta M.,University of Colima
Journal of Membrane Biology | Year: 2014

Using polyclonal and monoclonal antibodies to visualize under a confocal microscope type-1 cannabinoid receptors (CB1) and acetylcholine (ACh) receptors, respectively, or α-bungarotoxin conjugated to Alexa-Fluor 555 for Ach receptors, we found that they colocalize on twitch muscle fibers in the frog (Rana pipiens). We show that both the CB1and ACh receptors are present on the fast skeletal muscle motor end-plate. The CB1receptor is present along the entire membrane of the muscle fiber, whereas the ACh receptor is expressed primarily at the motor end-plate. Analysis of the colocalization produced a cross-correlation coefficient of 0.519 ± 0.021 (n = 9) for both receptors at the muscle motor end-plate. This study suggests a close proximity between these two types of receptor proteins and that they could interact. CB1could function at some stage of excitation–contraction coupling in these muscle fibers. However, further investigation is needed in order to clarify these issues. © 2014, Springer Science+Business Media New York.


Cannabinoids are key regulators of vascular tone, some of the mechanisms involved include the activation of cannabinoid receptor types 1 and 2 (CB); the transient receptor potential cation channel, subfamily V, member 1 (TRPV1); and non-(CB(1))/non-CB2 receptors. Here, we used the potent, selective CB(1) agonist arachidonylcyclopropylamide (ACPA) to elucidate the mechanism underlying vascular tone regulation. Immunohistochemistry and confocal microscopy revealed that CB(1) was expressed in smooth muscle and endothelial cells in rat aorta. We performed isometric tension recordings in aortic rings that had been pre-contracted with phenylephrine. In these conditions, ACPA caused vasorelaxation in an endothelium-independent manner. To confirm that the effect of ACPA was mediated by CB(1) receptor, we repeated the experiment after blocking these receptors with a selective antagonist, AM281. In these conditions, ACPA did not cause vasorelaxation. We explored the role of K(+) channels in the effect of ACPA by applying high-K(+) solution to induce contraction in aortic rings. In these conditions, the ACPA-induced vasorelaxation was about half that observed with phenylephrine-induced contraction. Thus, K(+) channels were involved in the ACPA effect. Furthermore, the vasorelaxation effect was similarly reduced when we specifically blocked calcium-activated potassium channel subunit alpha-1 (KCa1.1) (MaxiK; BKCa) prior to adding ACPA. Finally, ACPA-induced vasorelaxation was also diminished when we specifically blocked the calcium channel, voltage-dependent, L type, alpha 1C subunit (Ca(v)1.2). These results showed that ACPA activation of CB(1) in smooth muscle caused vasorelaxation of aortic rings through a mechanism involving the activation of K(Ca)1.1 and the inhibition of Ca(v)1.2.


PubMed | Technological Institute of Colima, University of Colima and University of Sonora
Type: | Journal: BioMed research international | Year: 2014

The pathologic cardiac remodeling has been widely documented; however, the physiological cardiac remodeling induced by pregnancy and its reversion in postpartum are poorly understood. In the present study we investigated the changes in collagen I (Col I) and collagen III (Col III) mRNA and protein levels in left ventricle from rat heart during pregnancy and postpartum. Col I and Col III mRNA expression in left ventricle samples during pregnancy and postpartum were analyzed by using quantitative PCR. Data obtained from gene expression show that Col I and Col III in left ventricle are upregulated during pregnancy with reversion in postpartum. In contrast to gene expression, the protein expression evaluated by western blot showed that Col I is downregulated and Col III is upregulated in left ventricle during pregnancy. In conclusion, the pregnancy differentially regulates collagens types I and III in heart; this finding could be an important molecular mechanism that regulates the ventricular stiffness in response to blood volume overload present during pregnancy which is reversed in postpartum.

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