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Romero-Garay Martha Guillermina,Martínez-Montaño Emmanuel,Hernández-Mendoza Adrián,Vallejo-Cordoba Belinda,González-Córdova Aarón Fernando,Montalvo-González Efigenia,García-Magaña María de Lourdes 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.4
In the present study, we evaluated new sources of plant proteases from fruits of Bromelia karatas (BK) and Bromelia pinguin (BP) to obtain antioxidant hydrolyzates/bioactive peptides (BPs) derived from chicken by-products (CH) and fish by-products (FH). The profile of the peptides was identified by reverse-phase high-resolution liquid chromatography (RP-HPLC) and the size weight distribution by molecular exclusion chromatography (SEC). The hydrolysates obtained with BK in both sources of by-products showed greater antioxidant capacity compared to those obtained with BP, presenting similar or higher values when compared to a commercial plant enzyme. The use of new sources of plant proteases allowed to obtain hydrolysates of hydrophilic character with a high percentage (> 50%) of peptides with molecular weights < 17.5 kDa from chicken and fish by-products. Therefore, based on the results obtained in antioxidant capacity it is possible to consider the hydrolysates as potential ingredients, food additives, and pharmaceutical products.
Romero-Arenas Omar,Amaro-Leal Luis Josué,Rivera Antonio,Parraguirre-Lezama Conrado,Sánchez-Morales Primo,Villa-Ruano Nemesio 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.3
This investigation reports on the biological control of Sphenarium purpurascens by using different concentrations of conidia from a native strain of Beauveria bassiana (MABb1) isolated in Puebla, Mexico under laboratory and in situ conditions. Formulations containing this native strain combined with two mesoporous materials (diatomaceous earth “D” and zeolite “Z”) were assayed in order to determine their effect on the mortality of the grasshopper. Concentrations of 3.67 × 108 to 10.30 × 108 conidia mL−1 caused a substantial mortality rate in the fourth-instar nymphs and adults of S. purpurascens. The observed mortality was directly proportional to the concentration of conidia. Under controlled conditions, the highest specific death rate K(d−1) was 0.78 for the formulation containing Z + D + MABb1 at 72 h post-infection. The formulations of D + MABb1 and Z + D + MABb1 caused a noticeable decrease in the population of grasshoppers in the experimental plots with statistical significant differences (α < 0.05). Interestingly, an increase in the mortality of S purpurascens occurred in July, August and September 2017 when the highest incidence of the grasshopper was recorded. Remarkably, the treatment based on Z + D + MABb1, produced an improvement in the yields of experimental maize plots (7847.4 ± 0.70 Kg ha−1) in comparison to control plots (4453.9 ± 0.50 Kg ha−1). These favorable consequences are reported for the first time in corn crops from Mexico.
SOME FAMILIES OF INFINITE SUMS DERIVED BY MEANS OF FRACTIONAL CALCULUS
Romero, Susana Salinas De,Srivastava, H.M. The Youngnam Mathematical Society Korea 2001 East Asian mathematical journal Vol.17 No.1
Several families of infinite series were summed recently by means of certain operators of fractional calculus(that is, calculus of derivatives and integrals of any real or complex order). In the present sequel to this recent work, it is shown that much more general classes of infinite sums can be evaluated without using fractional calculus. Some other related results are also considered.