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Search Results: 1 - 10 of 456865 matches for " Y Méndez "
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Comparación de medidas zoométricas en las gallinas baleares
Méndez,Y.; Pons,A.; Francesch,A.;
Archivos de Zootecnia , 2011, DOI: 10.4321/S0004-05922011000300032
Abstract: a total of 26 head and body measurements and 8 indexes have been taken in 42 hens of each balearian breed: ibizan, minorca and majorcan. these hens have been bred in standard conditions. the results have shown that ibizan has been the heaviest one, and the one which has scored the longest cranium and keel of sternum too. furthermore it has also reported a higher tarsus diameter. minorca has achieved the highest eye and wattle length and the biggest comb and ear lobes, the longest neck, back, tail, folding wing and thigh and the biggest ornithological measure and wingspan. majorcan is the lightest one and it has scored minor values. ibizan hen has obtained a higher cranium and ear lobe index. minorca has scored the higher value for the wattle index and majorcan has achieved a bigger comb index. majorcan hen showed the lower chest index.
Territorio maquilador y violencia. El caso de Ciudad Juárez
Luis Humberto Méndez y Berrueta
El Cotidiano , 2010,
Abstract: Partimos en este artículo de la siguiente apreciación: las fábricas maquiladoras de exportación instaladas en Ciudad Juárez, son construcciones materiales cargadas de significación que determinan, de manera importante, una territorialidad específica que, en lo esencial, se explica desde la violencia.
El trabajo minero: accidente, enfermedad y muerte
Luis Humberto Méndez y Berrueta
El Cotidiano , 2011,
Abstract: Es común que el agudo, y nunca resuelto del todo, problema de la salud, la seguridad, el accidente, la enfermedad y la muerte en el trabajo minero muestre una profunda discordancia con los diversos esquemas existentes de organización de los procesos productivos establecidos en las minas, de las particularidades tecnológicas de la explotación y, como en pocas ramas productivas, de una gran impunidad en el cumplimiento de las normas de seguridad e higiene establecidas por la autoridad laboral. A partir de recientes y trágicos acontecimientos en diferentes centros mineros, se pretende mostrar en este artículo cómo el permanente problema de la salud obrera en las minas, así como la recurrente impunidad con que actúan empresarios y autoridades, jurídicamente responsables de la seguridad laboral, nos hablan de una particular historia de trabajo que, por su impasibilidad, pareciera desafiar al tiempo, una historia inmovilizada que, como una gran fatalidad, se apoderara del imaginario del obrero y lo obligara a aceptar un destino, inmarcesible como cualquier sino, de enfermedad, accidente o muerte.
Modernidad subordinada y Estado híbrido en México
Luis Humberto Méndez y Berrueta
El Cotidiano , 2011,
Abstract: Desde el a o de 1983, el Estado mexicano busca transformarse. A la fecha, los diferentes procesos que apuntan en esta dirección, lejos de especificar el cambio, confunden el rumbo. Esta pérdida de orientación lo ha mantenido indefinido, y es de esta indefinición, producto a su vez de una situación de modernidad subordinada, de donde se genera su carácter híbrido.
Identification and Quantification of Monosaccharides in Aloe vera Gel by Acid and Enzymatic Hydrolysis and Wet Heat Treatment  [PDF]
Dianeli Madera Pi?a, Carlos Hernán Herrera Méndez, Lourdes Vargas y Vargas, Herbert Loria Sunza, Jorge Tamayo Cortez
Food and Nutrition Sciences (FNS) , 2017, DOI: 10.4236/fns.2017.88060
Abstract: Aloe vera (Aloe barbadensis Miller) possesses curative and therapeutic properties attributed to the polysaccharides found in its tissue. This work aimed to study hydrolyzed (chemical and enzymatical) Aloe vera gel extracts using ultrafiltration membranes with a pore size of 0.22 micron (μm). Nine chemical treatments were achieved with H2SO4 and three wet heat treatments were carried out at a pressure of 1.2 lbf/in2 for 15 minutes; in both cases, three different concentrations of Aloe vera gel juice (AGJ) were used: 1.5%, 2.5% and 3.5% w/w. The concentrations of H2SO4 were 0.10%, 0.25% and 0.40% w/w. Chemical experiments are performed over a factorial 32 design and results were analyzed using SPSS software (version 17, SPSS Inc.), finding the one labeled T7 (15 ml of AGJ 3.5% with 15 ml of H2SO4 0.10% added) the best of them, as it leaded to 0.0446 mg/ml of liberated glucose. Among the three wet heat treatments, the one labeled TC3 (15 ml of AGJ 3.5% with 15 ml of H2O added) was the best-performing one, as it leaded to 0.292 mg/ml of liberated glucose. Furthermore, an enzymatic hydrolysis was carried out using Novozymes’ Pectinex? AR and Viscozyme?. Hydrolisis with both enzymes yield to better results than acid hydrolysis: in the treatment with Pectinex? AR, 3.282 mg/ml of liberated glucose were obtained and 3.302 mg/ml in the treatment with Viscozyme?. The hydrolyzed substances obtained by acid and enzymatic hydrolysis, as well as by wet heat treatment, were subsequently analyzed by thin layer chromatography (TLC), using glucose, galactose and arabinose 1000 ppm solutions as reference patterns. Among the treatments by H2SO4, the one labeled T4 obtained an Rf value of 50, the same as on the galactose reference pattern.
Estudio de la erosión de los suelos en áreas protegidas de Cienfuegos, utilizando el cesio 137 como radiotrazador
Sibello Hernández,Rita Y; Febles González,José M;
Nucleus , 2011,
Abstract: abstract the large-scale nuclear explosions as a result of nuclear weapons tests or nuclear accidents are the main causes of/for the great dispersion of artificial radionuclides all over the world. one of these radionuclides is cesium-137, which is strongly fixed to the fine soils particles. this fact, together with its half-life of 30 years and its easy detection by gamma spectrometry have turned cesium 137, in a good radiotracer of soil movement. this technique has been widely used and validated in different landscapes throughout the world. its effectiveness was also previously validated and proved in cienfuegos province as well. this research was aimed at using the cesium-137 technique to study soil redistribution and quantify erosion in the so called protected areas in cienfuegos province, where soil loss and sediment transport are the main causes of deterioration of these ecosystems with the consequent economic and / or environmental losses. the results were represented in a map using the gvsig software by kriging, thus achieving greater visibility of the soil redistribution in the studied plot. the methodology used in this study could be used in other places wherever the magnitude of erosion problemsas well as knowing the soil redistribution plot pattern in the landscape are necessary and very useful to elaborate plans for rearrangement in land use management.
Respuesta en el rendimiento del plátano (Musa AAB cv. Hartón) en función de la nutrición mineral y su ciclo fenológico. Parte I. Crecimiento y producción
Hernández,Y; Marín,M; García,J;
Revista de la Facultad de Agronomía , 2007,
Abstract: in order to evaluate the effect of the application of fertilizers in the growth and yield of horn musa aab, plantain an essay was carried out in the colon municipality, "el paraiso" zone (ln: 8°56′00" and lw: 71°22′00")according to its requirements. treatments were plants without fertilization (t0), fertilized each three months (t1) applied at the time of the flowering (100% of phosphorus and 40% of potassium), and at the time of capping (60% of potassium) (t2), fertilized like a t2 but only half of the fertilizer (t3), fertilized like t2 but fertilized only with urea (t4). the design was of grouping at random with 25 repetitions, by applying the fertilizer to shoots at mother crop in flowering during a production cycle. significant differences were found only for the variable foliar emission, being observed between 1.9 and 2 fortnightly leaves. the greatest value of height and perimeter of the pseudo stem was 4.7 and 0.6 m (t4) respectively. the total amount of leaves was of 36 and in leaves a harvest of 11. all the treatments presented 7 hands. the required time for the blossom was 252 days for (t4) and 275 to 293 for the rest of the treatments. the analysis showed high significance for the yield variable by being 17.74 kg.bunch-1 the highest (t4) and 13.05 kg.bunch-1 the lowest (t3).
Respuesta en el rendimiento del plátano (Musa AAB cv. Hartón) en función de la nutrición mineral y su ciclo fenológico. Parte I. Crecimiento y producción Response to the plantain (Musa AAB cv. Horn) yield as a function of the mineral nutrients and its phenologycal cycle. Part I. Growth and Production
Y Hernández,M Marín,J García
Revista de la Facultad de Agronomía , 2007,
Abstract: Se realizó un ensayo para evaluar el efecto del fertilizante sobre el crecimiento y el rendimiento de plátano Musa AAB cv Hartón, según los requerimientos del cultivo. Los tratamientos fueron plantas: sin fertilización (T0), fertilizadas cada 3 meses (T1), fertilizadas al momento del desflore (100% de fósforo y 40% de potasio) y en el momento de descepe (60% de potasio) (T2), fertilizadas como T2 pero sólo la mitad del fertilizante (T3) y fertilizadas como T2 pero solamente con úrea (T4). El dise o fue de agrupamientos al azar con 25 repeticiones por tratamiento, aplicando el fertilizante a hijos de plantas madres en floración durante un ciclo de producción. Se encontraron diferencias significativas solo para la variable emisión foliar, observándose entre 1,9 y 2 hojas quincenales. El valor más alto de altura y perímetro del pseudotallo fue 4,07 m y 0,6 m (T4), respectivamente. El número de hojas totales emitidas fue de 36 y en hojas a cosecha de 11. Todas las plantas presentaron 7 manos. El tiempo requerido a floración fue de 252 días para T4 y de 275 a 293 en el resto de los tratamientos. El análisis mostró diferencias altamente significativas para la variable peso del racimo, siendo 17,74 kg.racimo-1 el valor más alto (T4) y 13,05 kg.racimo-1 el menor (T3). In order to evaluate the effect of the application of fertilizers in the growth and yield of Horn Musa AAB, plantain an essay was carried out in the Colon municipality, "El Paraiso" zone (LN: 8°56′00" and LW: 71°22′00")according to its requirements. Treatments were plants without fertilization (T0), fertilized each three months (T1) applied at the time of the flowering (100% of phosphorus and 40% of potassium), and at the time of capping (60% of potassium) (T2), fertilized like a T2 but only half of the fertilizer (T3), fertilized like T2 but fertilized only with urea (T4). The design was of grouping at random with 25 repetitions, by applying the fertilizer to shoots at mother crop in flowering during a production cycle. Significant differences were found only for the variable foliar emission, being observed between 1.9 and 2 fortnightly leaves. The greatest value of height and perimeter of the pseudo stem was 4.7 and 0.6 m (T4) respectively. The total amount of leaves was of 36 and in leaves a harvest of 11. All the treatments presented 7 hands. The required time for the blossom was 252 days for (T4) and 275 to 293 for the rest of the treatments. The analysis showed high significance for the yield variable by being 17.74 kg.bunch-1 the highest (T4) and 13.05 kg.bunch-1 the lowest (T3).
4-AMINOPIPERIDINAS Y ESPIRO-4-PIPERIDINAS: IMPORTANCIA FARMACOLóGICA Y ESFUERZOS SINTéTICOS
L. Y. Vargas-Méndez,V. V. Kouznetsov
Universitas Scientiarum , 2007,
Abstract: The piperidine compounds from natural or synthetic origin are of a great scientific interest due to his widestatus of biological activities: analgesic, neuroleptic, neurotropic, etc. Chemical and pharmacologicalproperties of the piperidine ring, including 4-aminopiperidines and spiro-4-piperidines are discussed inthis paper.
Sesgos relativos al género en las políticas editoriales de revistas científicas espa olas del campo de la educación. [Gender Biases in Editorial Policy of Spaniard Scientific Journals in the Field of the Education].
Vallejo, M.; Rojas, C. y Fernández-Cano, A.
Revista Electrónica de Investigación y Evaluación Educativa , 2002,
Abstract:
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