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  1. 8881
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    Effect of oxidation and crosslinking on functional, rheological and thermal properties of oat and apple starches Autoría: Sida-Arreola, Juan Pedro, Zamudio-Flores, P. B., Calderón-Loera, Rogelio, Espinosa-Solís, V., Vela-Gutiérrez, Gilber, Pacheco-Vargas, Glenda, Sáenz-Mendoza, A. I., Hernández-González, María, López-De la Peña, Haydee Yajaira, Aparicio Saguilan, Alejandro, Castro-Mendoza, Marisol Patricia, Ortega-Ortega, Adalberto

    Published 2024
    Fuente: Universidad del Papaloapan
    Tipo de material: Artículo
    Descripción: Oat (Oa) and apple (Ap) starches were isolated and chemically modified by oxidation with 10% NaOCl to obtain oxidized starches (OOa and OAp), followed by cross-linking with a mixture of 5.6 g of sodium tripolyphosphate and 11 g of sodium trimetaphosphate to obtain doubly modified starches (OCOa and OCAp). In the native and modified starches, the functional properties (swelling power and solubility, and freeze-thaw stability) and thermal and rheological properties (steady-state flow curves and paste formation profile) were evaluated. The swelling power of native and double modified starches varied from 57 to 86 g/g and the solubility from 0.8 to 6.0 g/100 g, these variables increased as the study temperature increased; the increment in these properties was greater in Oa compared to Ap. Oxidation followed by crosslinking increased the freeze-thaw stability in Oa and Ap starches at 30, 60, 75, and 90 °C. It also increased the Tg of OCAp and OCOa ≈ 9% compared to the native samples, respectively; while an inverse pattern was observed in apparent viscosity were this value decreased ≈ 0.8 Pa × s for Oa and ≈ 0.5 Pa × s for Ap compared to the double modified samples. All samples presented a thinning cut-type behavior (pseudoplastic), indicating structural differences. Cross-linking in oxidized starches produced a reinforcing matrix that was determined in the paste formation profile. Dual modification (oxidation-cross-linking) could be an alternative for using starches from underused botanical sources, such as apples and oats, with different functional properties and feasible applications in food systems.
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  2. 8882
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    Growth, yield, fiber content and lodging resistance in eight varieties of Cenchrus purpureus (Schumach.) Morrone intended as energy crop Autoría: Rueda Barrientos, José Ángel, Ortega-Jiménez, Eusebio, Hernández-Garay, Alfonso, Enríquez-Quiroz, Javier F., Guerrero-Rodríguez, Juan D., Quero-Carrillo, Adrián R.

    Published 2016
    Fuente: Universidad del Papaloapan
    Tipo de material: Artículo
    Descripción: Growth, biomass yield, fiber content and lodging resistance were studied, during a six month growth period, for eight varieties of Cenchrus purpureus, intended as energy crop, in Veracruz, Mexico. Then, only yield at day 182 was assessed for two additional years. The varieties were: CT115 (CT), African Cane (AC), Taiwan (TAI), King Grass (KG), Vruckwona (VRU), Roxo (RX), OM22 (OM) and Cameroon (CAM). Local weather is warm and sub-humid, historical data for monthly average temperature and annual rainfall were 25.8 °C and 1142 mm, respectively. Height, diameter and light interception were measured monthly from day 65–185. At day 185, biomass yield and tiller density were measured. Number of lying tillers was counted to estimate lodging resistance. Cellulose and hemicellulose content were estimated in leaf and stem. No differences were found for dry matter yield or stem yield at day 185 in the first year. Regarding the next two years, TAI yielded above CT, OM or ROX. Average dry matter yield was higher in the second year than in the establishment cycle (38.6 vs 21.1 Mg ha−1), but decreased in the third year (32.2 Mg ha−1). In both stem and whole plant, AC and KG showed higher hemicellulose content than RX, OM or CT; while AC and VRU had higher cellulose than RX in stem, or than CT in the whole plant. Furthermore, varieties AC, KG, VRU and TAI were resistant to lodging and had a higher fiber content, so they are recommended as energetic crops.
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  3. 8883
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    The Nexus Framework: Recursive Harmonic Genesis and the Digital Substrate of Reality Autoría: Kulik, Dean

    Published 2026
    Fuente: Zenodo
    Tipo de material: Recurso digital
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  4. 8884
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    Study: Time arrow and entropy as evolutionary functions: Natural intelligence (NI) as self-regulation of AI and consciousness within the framework of holistic information theory (H... Autoría: Dieter Liedtke

    Published 2026
    Fuente: Zenodo
    Tipo de material: Recurso digital
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  5. 8885
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    Abundancia relativa de la guitarra Rhinobatos productus (Ayres, 1856) (Pisces: Rhinobatidae) en Bahía Almejas, Baja California Sur, de 1991 a 1995 Autoría: Salazar-Hermoso, F, Villavicencio-Garayzar, C

    Published in Ciencias Marinas (1999)
    Fuente: Ciencias Marinas
    Tipo de material: Artículo científico
    Descripción: Daily commercial fishing data were used to determine the relative abundance of the shovelnose guitarfish Rhinobatos productus (Ayres, 1856) in Bahía Almejas, Baja California Sur (Mexico), from August 1991 to December 1995. Data suggest that seasonal trends exist in the catch, with maximum values from May to August. In order to determine if the seasonality is a result of variations in the abundance, catch effort data (number of nets laid) were included in the calculations and the results were expressed in terms of catch per unit effort (CPUE; org/net/week and org/net/month). The cyclical behavior of R. productus abundance follows lunar cycles, sea temperature and probably food availability, all critical factors if we consider that the species uses the area for its reproduction. The species enters massively into the bay during one month and leaves in just two weeks. An alternate trend was identified in the relative abundance between years, with the uneven years (1993 and 1995) as the abundant ones. The relative abundance of R. productus increased from 1991 to 1995, even with the respective decreases in the even years. Con base en la captura comercial diaria de dos embarcaciones, se determinó la abundancia relativa de la guitarra Rhinobatos productus (Ayres, 1856) en Bahía Almejas, Baja California Sur (México), de agosto de 1991 a diciembre de 1995. Se comprobó que existe una estacionalidad en la captura de la guitarra, con valores máximos de mayo a agosto. Para comprobar si existieron cambios en la abundancia de los organismos, se utilizó el esfuerzo (número de redes tendidas) en los cálculos y se expresaron en unidades de captura por unidad de esfuerzo (CPUE; org/red/semana y org/red/mes). El comportamiento estacional de la abundancia de R. productus en Bahía Almejas obedece a los ciclos lunares, las variaciones térmicas del mar y probablemente a la cantidad de alimento disponible, factores limitantes si se considera que la especie utiliza el área para su reproducción. Es por ello que la entrada de los organismos a la bahía ocurre rápidamente en el transcurso de un mes y la salida se da en sólo dos semanas. Interanualmente, se identificó un patrón alternante, siendo 1993 y 1995 los años que presentaron la mayor abundancia durante el tiempo de estudio. En este sentido, la abundancia relativa de R. productus ha ido en aumento desde 1991, aunque sus números disminuyeron ligeramente en 1992 y 1994.
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  6. 8886
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    Magnesium Glycinate Autoría: Xu, Jin

    Published 2025
    Fuente: Zenodo
    Tipo de material: Recurso digital
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