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Efecto de la Ultrafiltración sobre las Propiedades Reológicas de Gelatina Comestible de Origen Bovino
Serna-Cock,Liliana; Velásquez,Mario; Ayala,Alfredo A;
Información tecnológica , 2010, DOI: 10.4067/S0718-07642010000600011
Abstract: the effect of using ultrafiltration in the process of concentration of edible gelatin type b on the viscosity and gel strength of powder product was evaluated. the results were compared with those obtained by evaporation. gelatin was obtained from whole bovine hide (central part of the dermis) and mixtures of it with border-bait hide (border of the dermis) in proportion 50:50 and with border-bait hide and dried bovine hide in proportion 50:25:25, respectively. significant differences between treatments were found. the highest effect was observed in the third hour of processing with the use of ultrafiltration and mixture of whole hide and border-bait hide, in which 38.5% of the production showed viscosities greater to 42 milipoises and 69% gel strength above 300 g. in contrast, 7.7% and 46% respectively was obtained with evaporation. this reveáis the benefits of ultafiltration in the concentration process and on gelatin quality.
Efecto de la Ultrafiltración sobre las Propiedades Reológicas de Gelatina Comestible de Origen Bovino Effect of Ultrafiltration on the Rheological Properties of Edible Gelatin of Bovine Origin
Liliana Serna-Cock,Mario Velásquez,Alfredo A Ayala
Información Tecnológica , 2010,
Abstract: Se evaluó el efecto de la ultrafiltración en el proceso de concentración de gelatina comestible tipo B sobre el poder viscosante y gelificante del producto en polvo. Los resultados se compararon con los obtenidos por evaporación. La gelatina se obtuvo de carnaza bovina entera (parte central de la dermis) y mezclas de ésta con desorillo sebo (extremos de la dermis) en proporción 50:50 y con desorillo sebo y carnaza bovina seca en proporción 50:25:25, respectivamente. Se presentaron diferencias significativas entre los tratamientos. El mayor efecto se presentó en la tercera hora de procesamiento con el uso de ultrafiltración y mezcla de carnaza entera y desorillo-sebo, donde el 38.5% de la producción presentó viscosidades mayores a 42 milipoises y el 69% poder gelificante por encima de 300 g. En contraste, se obtuvo 7.7% y 46% respectivamente con evaporación, Esto revela los beneficios de la ultrafiltración en el proceso de concentración y en la calidad de la gelatina. The effect of using ultrafiltration in the process of concentration of edible gelatin type B on the viscosity and gel strength of powder product was evaluated. The results were compared with those obtained by evaporation. Gelatin was obtained from whole bovine hide (central part of the dermis) and mixtures of it with border-bait hide (border of the dermis) in proportion 50:50 and with border-bait hide and dried bovine hide in proportion 50:25:25, respectively. Significant differences between treatments were found. The highest effect was observed in the third hour of processing with the use of ultrafiltration and mixture of whole hide and border-bait hide, in which 38.5% of the production showed viscosities greater to 42 milipoises and 69% gel strength above 300 g. In contrast, 7.7% and 46% respectively was obtained with evaporation. This reveáis the benefits of ultafiltration in the concentration process and on gelatin quality.
Efecto de la agitación sobre la deshidratación osmótica de pitahaya amarilla (selenicereus megalanthus s.) Empleando soluciones de sacarosa
Ayala-Aponte,Alfredo Adolfo; Serna-Cock,Liliana; Giraldo-Cuartas,Carlos Julián;
Interciencia , 2009,
Abstract: the effect of the stirring (180, 220, y 240rpm) on water loss and sugar gain in the process of osmotic dehydration of pitahaya slices was studied, using osmotic solutions of sucrose with two concentration levels, 45 and 55°brix. additionally, the porosity of the pitahaya in fresh and osmotically dehydrated states was determined and related to the stirring speed. the results showed that stirring level has a significant effect on water loss, with a greater relative variation for the treatments at 45°brix. sugar gain did not show significant differences as an effect of agitation speed. this is explained by the low porosity of the pitahaya in fresh state (2.78 ±0.35%), which hinders the entry of the sucrose molecules into the fruit. the results suggest that osmotic dehydration is emerging as an appropriate pretreatment technique for the yellow pitahaya due to the low gain in solids during the process.
EFECTO DE LA BIOFERTILIZACIóN SOBRE EL CRECIMIENTO EN MACETA DE PLANTAS DE CA?A DE AZúCAR (Saccharum officinarum)
SERNA-COCK,LILIANA; ARIAS-GARCíA,CAMILO; VALENCIA HERNANDEZ,LEIDY JOHANA;
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: the use of microorganisms as fertilizer has demonstrated beneficial effects on plant growth and is an alternative to chemical fertilizers. however, each microorganism has different beneficial effects. this study evaluated the effect of applying microorganism fertilizers, azospirillum brasilense, azotobacter chroccocum, and trichoderma lignorum on the growth of potted sugarcane plants var. cc 934418. plant growth was measured in terms of stem diameter, stem and root length, and the number of leaves and roots 15, 30, and 45 days after planting. plant growth evidenced statistically significant differences among treatments. microorganism fertilizers showed a positive effect on the growth of sugarcane plants, with azospirillum brasilense and trichoderma lignorum as the microorganisms that exercised the greatest effect on stem diameter, root systems, and plant foliation. beneficial effects of trichoderma lignorum on leaf growth were observed. this is a new scientific contribution since this species has not been reported as promoting plant growth.
APLICACIóN DE ENDOPEPTIDASA ALCALINA EN CARNAZA BOVINA PARA MEJORAR LA CALIDAD DE LA GELATINA
Serna-Cock,Liliana; Pineda-Cuervo,Darío; Ayala-Aponte,Alfredo;
Revista Colombiana de Química , 2007,
Abstract: the international market price of gelatine is determined by its physical-chemical properties, that depend on the raw material, the collagen extraction method and the concentration method. in this work, using class b gelatine production processes in pilot plant, the effect of application of alkaline endopeptidase was evaluated in the pre-treatment of three types of bovine hide on the gelatine final quality as measured by bloom, viscosity and clarity. the results were compared with processes in which the same raw materials were used without enzymatic pre-treatment. the statistical analysis showed significant differences among the treatments. the best bloom, viscosity and clarity results were presented using enzymatic pre- treatment in the whole hide, obtained in thirteen hours of process 61.5% of the gelatine with bloom higher than 300g, 51.3% with viscosities values higher than 42 mp and 82 ,1 % with high clarities value, with values lower than 39 nephelometric turbidity units. the whole hide without enzymatic pre-treatment showed 41% of high values of bloom, 7.7% of high viscosities and 76.9% of high clarities .
EFECTO DE LA BIOFERTILIZACIóN SOBRE EL CRECIMIENTO EN MACETA DE PLANTAS DE CA A DE AZúCAR (Saccharum officinarum) EFEITO DA BIOFERTILIZA O NO CRESCIMENTO DE PLANTAS EM VASOS a úcar de cana (Saccharum officinarum) EFFECT OF BIOFERTILIZATION ON THE GROWTH OF POTTED SUGARCANE PLANTS (Saccharum officinarum)
LILIANA SERNA-COCK,CAMILO ARIAS-GARCíA,LEIDY JOHANA VALENCIA HERNANDEZ
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: El uso de microorganismos como fertilizante, ha demostrado tener efectos benéficos sobre el crecimiento de plantas y son una alternativa al uso de fertilizantes guímicos, sin embargo, cada microorganismo difiere en sus efectos benéficos. En este trabajo se evaluó el efecto de la aplicación de microorganismos fertilizantes, Azospirillum brasilense, Azotobacter chroccocum y Trichoderma lignorum sobre el crecimiento en maceta de plantas de ca a de azúcar variedad CC 934418. El crecimiento de las plantas se midió en términos de diámetro del tallo, longitud de tallo y raíces, y número de hojas y raíces a los 15, 30 y 45 días de la siembra. El crecimiento de las plantas mostró diferencias estadísticamente significativas entre los tratamientos. Los microorganismos fertilizantes mostraron efecto positivo sobre el crecimiento de plantas de ca a de azúcar, siendo Azospirillum brasilense y Trichoderma lignorum los microorganismos gue ejercieron mayor efecto sobre el diámetro del tallo y los sistemas radical y foliar de la planta. Se observaron los efectos beneficiosos de Trichoderma lignorum sobre el crecimiento de la hoja. Este es un nuevo aporte científico, ya que esta especie no ha sido reportada como promotora de crecimiento vegetal. 0 uso de microrganismos como fertilizante, tem sido demonstrado gue têm efeitos benéficos no crescimento das plantas e s o considerados uma alternativa ao uso de fertilizantes guímicos, no entanto, cada microrganismo possui diferentes efeitos benéficos. Neste estudo foi avaliado o efeito da aplica o de microorganismos fertilizantes, Azospirillum brasilense, Azotobacter chroccocum e Trichoderma lignorum no crescimento de cana-de-a ucar da variedade CC 934418 plantadas em vasos. 0 crescimento das plantas foi medido em termos do diametro do caule, comprimento de caule e da raiz e número de folhas e raízes nos dias 15, 30 e 45 após a semeadura. 0 crescimento da planta mostrou diferen as significativas entre os tratamentos. Os microrganismos fertilizantes mostraram efeito positivo sobre o crescimento das plantas de cana, os microrganismos Azospirillum brasilense e Trichoderma lignorum exerceram um efeito maior em diametro do caule, sistema radicular e folhas da planta. Os efeitos benéficos do Trichoderma em lignorum crescimento da folha foram observadas. Esta é uma nova contribui o científica vez que esta espécie n o foi relatada como a promo o de crescimento vegetal. The use of microorganisms as fertilizer has demonstrated beneficial effects on plant growth and is an alternative to chemical fertilizers. However, each microorganism
Plan de saneamiento para una distribuidora de alimentos que atiende a ni?os y adultos mayores
Serna-Cock,Liliana; Correa-Gómez,Maria D.C.; Ayala-Aponte,Alfredo A;
Revista de Salud Pública , 2009, DOI: 10.1590/S0124-00642009000500014
Abstract: the responsibility for providing healthy food involves all members of the production chain from input supplier to the distributor and consumer of food. children and older adults represent the most vulnerable consumers for acquiring food-borne illness (fbi), meaning that the risk factors produced in food-processing targeted for this population group must be reduced. a clean-up plan was thus designed and implemented following the guideline laid down in decree 3075/1997 to reduce fbi risk factors in a population of children and older adults. a training plan was also conducted for handling staff involved in receiving, storing, packaging and distributing raw materials in a food distributor. the clean-up plan and training led to a 40 % to 70 % increase in compliance with best manufacturing practices (bpm). these results represent a solid basis for ensuring food safety and reducing the risk of acquiring fbi in the study population. this article also provides an outline for easily acquiring the necessary methodology for implementing a clean-up plan in a food industry.
Effects of fermentation substrates and conservation methods on the viability and antimicrobial activity of Weissella confusa and its metabolites
Serna-Cock,Liliana; Enríquez-Valencia,Cruz E; Jiménez-Obando,Eliana M; Campos-Gaona,Rómulo;
Electronic Journal of Biotechnology , 2012,
Abstract: lactic acid bacteria produce metabolites with antagonistic activity against other bacteria. however, growth conditions and conservation methods may reduce the viability and antimicrobial activity of lactic acid bacteria. this study evaluated the effects of fermentation substrate, lyophilization (freeze-drying) and refrigeration on the viability and antimicrobial activity of weissella confusa strain and its metabolites against pathogens responsible for bovine mastitis. w. confusa strain was grown in mrs broth and milk supplemented with yeast extract and glucose (myeg). the collected fractions were preserved by lyophilization or under refrigeration at 4oc. every seven days, the viability of w. confusa strain and the stability of its metabolites were evaluated against staphylococcus aureus and streptococcus agalactiae by disc diffusion assays. in both fermentation substrates, the combination of lyophilized strain and metabolites retained antimicrobial activity against the two pathogens for 42 days. also, w. confusa strain retained adequate viability and antimicrobial activity when grown in myeg and stored under refrigeration conditions. it was concluded that myeg and refrigeration are acceptable low cost options to preserve the viability of w. confusa for its potential commercial use in the prevention and treatment of bovine mastitis.
Lactic acid fermentative production using waste from the harvest of green sugar cane as a substrate
Serna Cock,Liliana; Rodríguez de Stouvenel,Aida;
Interciencia , 2007,
Abstract: waste products from the harvest of green sugar cane (var. cc 85-92), were tested as a substrate in batch type fermentative production of lactic acid. the fermentations were carried out at 32°c, ph 6.0, with juice obtained from cane tops and leaves (jtl) and lactococcus lactis subs lactis isolated from the same variety of cane. lactic acid concentration (la), substrate conversion (sc), biomass concentration, velocity of product formation (rp) and yield (yp/s) were measured, and the results were compared with those of fermentations using the same strain in mrs culture medium, with 60g·l-1 of glucose. lactic acid concentrations up to 28.5g·l-1 with a yield of 0.85g·g-1 were obtained using jtl medium in a 48h incubation period. jtl and mrs showed statistically significant differences in yp/s, sc and biomass concentration, while jtl and mrs were not significantly different in la and rp, suggesting that waste products from the sugar cane harvest could be used as a cheap raw material for the fermentative production of lactic acid.
Lactic acid production by a strain of Lactococcus lactis subs lactis isolated from sugar cane plants
Serna Cock,Liliana; Rodríguez de Stouvenel,Aida;
Electronic Journal of Biotechnology , 2006,
Abstract: a lactococcus lactis subs lactis strain was selected from 20 lactic acid strains isolated from the leaves of sugar cane plants, variety cc 85-92. the effects of substrate concentration and ph control on lactic acid (la) production, glucose conversion (gc) and yield (yp/s) were investigated using this strain. in batch fermentation at 32oc, with 60 gl-1 of glucose and a ph of 6.0, concentrations of up to 35 gl-1 of lactic acid were obtained. maximum production and glucose conversion was achieved at low glucose concentrations. the strain shows great potential for lactic acid production from glucose, even without using ph control during fermentation (13.7 gl-1)
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