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Search Results: 1 - 10 of 6131 matches for " Josafat Marina Ezquerra-Brauer "
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Bioactive Peptides and Depsipeptides with Anticancer Potential: Sources from Marine Animals
Guadalupe-Miroslava Suarez-Jimenez,Armando Burgos-Hernandez,Josafat-Marina Ezquerra-Brauer
Marine Drugs , 2012, DOI: 10.3390/md10050963
Abstract: Biologically active compounds with different modes of action, such as, antiproliferative, antioxidant, antimicrotubule, have been isolated from marine sources, specifically algae and cyanobacteria. Recently research has been focused on peptides from marine animal sources, since they have been found as secondary metabolites from sponges, ascidians, tunicates, and mollusks. The structural characteristics of these peptides include various unusual amino acid residues which may be responsible for their bioactivity. Moreover, protein hydrolysates formed by the enzymatic digestion of aquatic and marine by-products are an important source of bioactive peptides. Purified peptides from these sources have been shown to have antioxidant activity and cytotoxic effect on several human cancer cell lines such as HeLa, AGS, and DLD-1. These characteristics imply that the use of peptides from marine sources has potential for the prevention and treatment of cancer, and that they might also be useful as molecular models in anticancer drug research. This review focuses on the latest studies and critical research in this field, and evidences the immense potential of marine animals as bioactive peptide sources.
Physicochemical properties of cowpea (Vigna unguiculata L. Walp.) meals and their apparent digestibility in white shrimp (Litopenaeus vannamei Boone) Propiedades fisicoquímicas de harinas de frijol yorimón (Vigna unguiculata L. Walp.) y su digestibilidad aparente en camarón Litopenaeus vannamei Boone
Martha Elisa Rivas-Vega,Ofelia Rouzaud-Sandez,María Guadalupe Salazar-García,Josafat Marina Ezquerra-Brauer
Hidrobiológica , 2009,
Abstract: The effect of different feed processing methods on the physicochemical properties, and apparent digestibility of cowpea (Vigna unguiculata) meals as ingredients in diets for white shrimp (Litopenaeus vannamei) was investigated. Five experimental cowpea meals were prepared: whole raw (WRC), dehulled (DC), cooked (CC), germinated (GC) and extruded (EXC). The physicochemical properties of the meals were evaluated using differential scanning calorimetry. The meals were included at 15% in diets for L. vannamei (15.4 g) to determine firmness of pellets and in vivo digestibility of nutrients by using chromic oxide as inert marker. Six diets were evaluated: a control diet, and five diets containing the different cowpea meals. Transition enthalpy significantly decreased after thermal treatment, from 6.1 J/g in WRC to 1.4 J/g in CC, and disappeared in EXC. Firmness of pellets varied from 1.1 N in the EXC diet to 2.8 N in the WRC diet. A significant negative correlation between transition enthalpy and carbohydrate digestibility was found. Dry matter, protein, carbohydrate and lipid digestibility of cowpea meals significantly increased after germinating, cooking or extruding. It is concluded that germinated, cooked and extruded cowpea meals are highly digestible for shrimp and that enthalpy of transition is negatively correlated with the digestibility of carbohydrates. Se evaluó el efecto de diferentes procesos sobre las propiedades fisicoquímicas y digestibilidad aparente de la harina de frijol yorimón (Vigna unguiculata) como ingrediente en alimentos para camarón blanco (Litopenaeus vannamei). Se elaboraron cinco harinas de frijol yorimón: entero crudo (WRC), decorticado (DC), cocido (CC), germinado (GC) y extruido (EXC). Las características térmicas de las harinas fueron evaluadas usando calorimetría diferencial de barrido. Se elaboraron seis alimentos experimentales: un alimento control y cinco alimentos conteniendo 15% de las diferentes harinas de frijol yorimón. A estos alimentos se le determinó firmeza y digestibilidad in vivo de nutrientes para L. vannamei (15.4 g) usando óxido de cromo como marcador inerte. La entalpía de transición decreció después del tratamiento térmico, de 6.1 J/g en la WRC a 1.4 J/g en la CC, y desapareció en la EXC. La firmeza de los alimentos varió de 1.1 N en el alimento con EXC a 2.8 N en el alimento con WRC. Se encontró una correlación significativa negativa entre la entalpía de transición y la digestibilidad de carbohidratos de la harina del frijol yorimón. La digestibilidad de materia seca, proteína, carbohidratos y lípidos de
Physicochemical properties of cowpea (Vigna unguiculata L. Walp.) meals and their apparent digestibility in white shrimp (Litopenaeus vannamei Boone)
Rivas-Vega, Martha Elisa;Rouzaud-Sandez, Ofelia;Salazar-García, María Guadalupe;Ezquerra-Brauer, Josafat Marina;Goytortúa-Bores, Ernesto;Civera-Cerecedo, Roberto;
Hidrobiológica , 2009,
Abstract: the effect of different feed processing methods on the physicochemical properties, and apparent digestibility of cowpea (vigna unguiculata) meals as ingredients in diets for white shrimp (litopenaeus vannamei) was investigated. five experimental cowpea meals were prepared: whole raw (wrc), dehulled (dc), cooked (cc), germinated (gc) and extruded (exc). the physicochemical properties of the meals were evaluated using differential scanning calorimetry. the meals were included at 15% in diets for l. vannamei (15.4 g) to determine firmness of pellets and in vivo digestibility of nutrients by using chromic oxide as inert marker. six diets were evaluated: a control diet, and five diets containing the different cowpea meals. transition enthalpy significantly decreased after thermal treatment, from 6.1 j/g in wrc to 1.4 j/g in cc, and disappeared in exc. firmness of pellets varied from 1.1 n in the exc diet to 2.8 n in the wrc diet. a significant negative correlation between transition enthalpy and carbohydrate digestibility was found. dry matter, protein, carbohydrate and lipid digestibility of cowpea meals significantly increased after germinating, cooking or extruding. it is concluded that germinated, cooked and extruded cowpea meals are highly digestible for shrimp and that enthalpy of transition is negatively correlated with the digestibility of carbohydrates.
Antimutagenicity and Antiproliferative Studies of Lipidic Extracts from White Shrimp (Litopenaeus vannamei)
Griselda Wilson-Sanchez,Carolina Moreno-Félix,Carlos Velazquez,Maribel Plascencia-Jatomea,Anita Acosta,Lorena Machi-Lara,María-Lourdes Aldana-Madrid,Josafat-Marina Ezquerra-Brauer,Ramón Robles-Zepeda,Armando Burgos-Hernandez
Marine Drugs , 2010, DOI: 10.3390/md8112795
Abstract: An organic extract from fresh shrimp ( Litopenaeus vannamei) was studied for antimutagenic and antiproliferative properties using Salmonella typhimurium tester strains TA98 and TA100 with metabolic activation (S9) and a cancer cell line (B-cell lymphoma), respectively. Shrimp extract was sequentially fractionated by thin layer chromatography (TLC) and each fraction was tested for antimutagenic and antiproliferative activities. Crude organic extracts obtained from shrimp reduced the number of revertants caused by aflatoxina B 1, showing a dose-response type of relationship. Sequential TLC fractionation of the active extracts produced several antimutagenic and/or antiproliferative fractions. These results suggested that the lipid fraction of the tested species contained compounds with chemoprotective properties that reduce the mutagenicity of AFB 1 and proliferation of a cancer cell line.
Efecto de la adición del rotífero Brachionus rotundiformis (Tschugunoff, 1921) sobre la calidad del agua y la producción, en cultivos super-intensivos de camarón blanco del Pacífico Litopenaeus vannamei (Boone, 1931)
Campa?a-Torres,Alfredo; Martínez-Córdova,Luis R; Villarreal-Colmenares,Humberto; Hernández-López,Jorge; Ezquerra-Brauer,Josafat M; Cortés-Jacinto,Edilmar;
Revista de biología marina y oceanografía , 2009, DOI: 10.4067/S0718-19572009000200007
Abstract: the effectiveness of the rotifer brachionus rotundiformis as exogenous natural feed combined with balanced feed on the production parameters of litopenaeus vannamei and the water quality was evaluated. different concentrations of rotifers were tested (0, 5, 10, 15 and 20 rotifers ml-1) during 45 days. no significant differences were assessed in the phosphate levels among treatments. the ph level was statistically lower in the treatments with 15 and 20 rotifers ml-1. nitrate, nitrite and ammonia were significantly lower in the treatments with low concentration of rotifers (0 and 5 ml-1), while the highest values were achieved in the higher concentrations (15 and 20 ml-1) without reaching toxic levels. the weight gain, biomass, survival and specific growth rate of l. vannamei were significantly higher in the treatments with the higher number of rotifers (15 and 20 ml-1), whereas the lowest values were found in the control treatment (0 ml-1). the feed conversion ratio (fcr) was statistically lower in the treatment with the highest concentration of rotifers, while the highest fcr was found in the control. it is concluded that the use of the rotifer b. rotundiformis in high concentrations improves the production parameters on the pacific white shrimp, without deteriorating the water quality.
Qué hacen los legisladores en México. El trabajo en comisiones de Luisa Béjar Algazi (coordinadora)
Josafat Cortez Salinas
Perfiles latinoamericanos , 2010,
Abstract:
Santiago BASABE SERRANO. Jueces sin toga: políticas judiciales y toma de decisiones en el Tribunal Constitucional del Ecuador (1999-2007) . Ecuador: Facultad Latinoamericana de Ciencias Sociales, 2011. 200 pp. ISBN: 978-9978-67-2822.
Josafat CORTEZ SALINAS
América Latina Hoy , 2012,
Abstract:
Rese a de "Derecho y Poder. Kelsen y Schmitt frente a frente" de Córdova Vianello, L.
Josafat Cortez Salinas
Andamios , 2010,
Abstract:
LA PROPUESTA DE LA REELECCIóN INMEDIATA DE LEGISLADORES EN LA REFORMA DEL ESTADO DE 2010
Josafat CORTEZ SALINAS
Boletín mexicano de derecho comparado , 2011,
Abstract:
Rese a de "La Suprema Corte de Justicia de la Nación desde la visión de Antonio Carrillo Flores", de la SUPREMA CORTE DE JUSTICIA DE LA NACIóN.
Josafat CORTEZ SALINAS
Boletín mexicano de derecho comparado , 2012,
Abstract: ...
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