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Domingo Cruz-Labana José,Antonio Tarango-Arámbula Luis,Luis Alcántara-Carbajal José,Delgado-Alvarado Adriana,Magdalena Crosby-Galván María,Manuel Ruiz-Vera Víctor 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
Ants are among the organisms that are considered habitat engineers due to their ability to induce changes in the soil. An economically significant ant species is Liometopum apiculatum MAYR, 1870, as its pupae are utilized for human consumption. This ant has been extensively studied using various biological and ecological approaches in diverse habitats across North America. However, there is limited research documenting the properties of the soil in which they nest. The objective of this research was to analyze the physical and chemical properties of soil from Liometopum apiculatum nests and random sites, and to explain how ants can modify the soil in a semi-arid area of north-central Mexico. A sample size of 45 nests distributed in scrub vegetation was determined. Soil samples (2.5 kg) were collected from nests and random sites (20 m in a random direction) at a depth of 20 cm, and aggregates of 3 to 4 cm in length were included during the excavations. The physical variables evaluated were moisture, texture, bulk density and mechanical penetration resistance (MPR); while the chemical ones were pH, electrical conductivity, organic matter, nitrogen, phosphorus and potassium. The variables moisture (p = 0.031), bulk density (p < 0.01), MPR (p = 0.0289); pH (p < 0.001), electrical conductivity (p < 0.01) and organic matter (p < 0.01) had statistical differences between soil from nests and random sites. This research adds to the existing body of knowledge on Liometopum apiculatum by presenting information on the physical and chemical properties of the soil in which they establish their nests.
Domingo, Laura Montalban,Giner, Beatriz Baydal,Martin, Clara Zamorano,Herraiz, Julia I. Real Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.5
Rails are key elements in railway superstructure since these elements receive directly the train load transmitted by the wheels. Simultaneously, rails must provide effective stress transference to the rest of the track elements. This track element often deteriorates as a consequence of the vehicle passing or manufacturing imperfections that cause in rail several defects. Among these rail defects, transverse cracks highlights and are considered a severe pathology because they can suddenly trigger the rail failure. This study is focused on UIC-60 rails with transverse cracks. A 3-D FEM model is developed in ANSYS for the flawless rail in which conditions simulating the crack presence are implemented. To account for the inertia loss of the rail as a consequence of the cracking, a reduction of the bending stiffness of the rail is considered. The numerical models have been calibrated using the first four bending vibration modes in terms of frequencies. These vibration frequencies have been obtained using the Experimental Modal Analysis technique, studying the changes in the modal parameters of the rails induced by the crack and comparing the results obtained by the model with experimental results. Finally, the calibrated and validated models for the single rail have been implemented in a complete railway ballasted track FEM model in order to study the static influence of the cracks on the rail deflection caused by a load passing.
José Domingo Cruz-Labana,María Magdalena Crosby-Galván,Adriana Delgado-Alvarado,José Luis Alcántara-Carbajal,Juan Manuel Cuca-García,Luis Antonio Tarango-Arámbula 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4
In Mexico the ant Liometopum apiculatum is an important insect nutritionally, economically and ecologically. Their larvae (“escamoles”) contain proteins, lipids, vitamins and minerals, the concentrations of which may be related with the type of vegetation where the ant forages. The objective of this study was to evaluate the content of macro and micro nutrients of L. apiculatum larvae collected in three types of vegetation in north-central Mexico. We determined content of moisture, crude protein, total lipids, crude fiber, ash, and nitrogen-free extract. The amino acids were analyzed by cationic Exchange chromatography with acid hydrolysis and fatty acids by gas chromatography and solvent extraction with sodium methoxide. The effect of vegetation type on nutrient content was determined with an ANOVA and Sheffé comparison of means (P < .05). The concentration of amino acids and fatty acids (FA) was analyzed with a Kruskall-Wallis test (P < .05). Significant differences were found in protein, lipids and ash (P < .0001) and moisture content (P < .0036). We identified 17 amino acids, which concentration differed by type of vegetation. There were no significant differences in fatty acids. It is likely that the differences in the concentrations of macronutrients are due to the diversity and differential density of the food components available in each type of vegetation for L. apiculatum, and that the number of types and quantity of amino acids and fatty acids depend on the chemical properties of the liquid secretions the ants obtain by trophobiosis.
Fructo-Oligosaccharide Production from Inulin Through Partial Citric or Phosphoric Acid Hydrolyses
José Domingos Fontana,Adelia Grzybowski,Marcela Tiboni,Maurı´cio Passos 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.11
Purified inulin from Dahlia tubers was partially hydrolyzed to form fructo-oligosaccharides by using citric or phosphoric acids (pH, 2.0–2.5) as mild acid catalysts. The ideal kinetic conditions to ensure a high yield of fructo-oligosaccharides relative to free fructose were a temperature range of 85°C–95°C, a hydrolysis time of 15–25 minutes, and a catalyst pH of 2.5. At the higher temperature and the longest hydrolysis time, an inversion of the product ratio occurred. Under these conditions, co-generation of hydroxymethylfurfural occurred, and it was eliminated by activated charcoal. Unlike in classic hydrolysis with hydrochloric or sulfuric acid, deionization of the actual hydrolysates was not necessary because the catalyst neutralization with common bases results in the formation of co-nutrients with alternative uses as foods or fermentation substrates. These whole hydrolysates can be advantageously added as nutraceuticals to carbonated beverages and acidic foods, such as soft drinks and yogurts.
Balderramo Domingo C.,Romagnoli Pablo Alberto,Granlund Atle van Beelen,Catalan-Serra Ignacio 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.4
There is growing evidence of the role of fungal microbiota in the pathogenesis of inflammatory bowel disease (IBD). Fungi can exert direct pro-inflammatory effects or modify the bacterial composition via interkingdom interactions. Although several studies have demonstrated alterations in the fecal fungal microbiota composition in IBD, there is a wide variation in the mycobiome in different populations, with no definite pattern that can define the mycobiome in IBD having yet been identified. Recent work has suggested that characterizing the fecal fungal composition may influence therapeutic decisions and help to predict outcomes in a subset of IBD patients. In this study, we review the current literature on the emerging role of the fecal mycobiome as a potential tool for precision medicine in IBD.
Packet Size Optimization for Improving the Energy Efficiency in Body Sensor Networks
Mari Carmen Domingo 한국전자통신연구원 2011 ETRI Journal Vol.33 No.3
Energy consumption is a key issue in body sensor networks (BSNs) since energy-constrained sensors monitor the vital signs of human beings in healthcare applications. In this paper, packet size optimization for BSNs has been analyzed to improve the efficiency of energy consumption. Existing studies on packet size optimization in wireless sensor networks cannot be applied to BSNs because the different operational characteristics of nodes and the channel effects of in-body and on-body propagation cannot be captured. In this paper, automatic repeat request (ARQ), forward error correction (FEC) block codes, and FEC convolutional codes have been analyzed regarding their energy efficiency. The hop-length extension technique has been applied to improve this metric with FEC block codes. The theoretical analysis and the numerical evaluations reveal that exploiting FEC schemes improves the energy efficiency, increases the optimal payload packet size, and extends the hop length for all scenarios for in-body and on-body propagation.