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Scientia Agropecuaria
Academic Journal Academic Journal | 20/05/2015 Please log in to see more details
Scientia Agropecuaria
20/05/2015

Subject terms:

agriculture - animal husbandry - agribusiness - Agriculture - Agriculture (General)

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Directory of Open Access Journals

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Scientia agropecuaria: revista científica de la Universidad Nacional de Trujillo.
Revista científica de la Universidad Nacional de Trujillo
Universidad Nacional de Trujillo. Facultad de Ciencias Agropecuarias, issui...
Periodical Periodical | 01/01/2010 Please log in to see more details
Scientia agropecuaria: revista científica de la Universidad Nacional de Trujillo.
Revista científica de la Universidad Nacional de Trujillo
01/01/2010

Subject terms:

Peru. - Agricultural industries -- Periodicals. - Agricultural industries -- Peru -- Periodicals. - Agronomy -- Periodicals. - Agronomy -- Peru -- Periodicals. - Food industry and trade -- Periodicals. - Food industry and trade -- Peru -- Periodicals. - Animal culture -- Periodicals. - Animal culture -- Peru -- Periodicals. - Agricultural industries. - Agronomy. - Animal culture. - Food industry and trade. - Electronic journals - Periodicals.

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[Untitled]
Nascimento Machado, Ludmila;Loss, Arcângelo;Zilli Bacic, Ivan Luiz;Dortzbac...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):137-147 Please log in to see more details
[Untitled]
Scientia Agropecuaria. April 2017 8(2):137-147

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - morfogênse - pedogênese - análise ambiental integrada - mapas temáticos - morphogenesis - pedogenesis - integrated environmental analysis - thematic maps

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Producción de polihidroxialcanoatos por bacterias halófilas nativas utilizando almidón de cáscaras de Solanum tuberosum L / Production of polyhydroxyalkanoates by native halophilic bacteria using Solanum tuberosum L. shell starch
Guzmán, César;Hurtado, Alberto;Carreño, Carmen;Casos, Indira
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):109-118 Please log in to see more details
El objetivo del presente estudio fue determinar la concentración de almidón de cáscara... more
Producción de polihidroxialcanoatos por bacterias halófilas nativas utilizando almidón de cáscaras de Solanum tuberosum L / Production of polyhydroxyalkanoates by native halophilic bacteria using Solanum tuberosum L. shell starch
Scientia Agropecuaria. April 2017 8(2):109-118
El objetivo del presente estudio fue determinar la concentración de almidón de cáscaras de Solanum tuberosum L. "papa" para la producción de polihidroxialcanoatos, PHA, por bacterias halófilas nativas, como una alternativa para disminuir los costos de producción de estos biopolímeros, posibles reemplazantes de los plásticos provenientes del petróleo. Las bacterias fueron aisladas de muestras de agua de ocho salinas y fueron enriquecidas en caldo HM1 a 30 °C, con 5, 10, 15, 20, 25 y 30 g 100 mL-1 de NaCl. A continuación, se realizaron diluciones, se tomaron alícuotas y se sembraron en agar HM1, obteniéndose 203 aislados de bacterias halófilas que fueron cultivados en caldo HM2 con 10 g.L-1 de glucosa como fuente de carbono y entre las que el 38,92% presentó gránulos de PHA teñidos por Sudan Negro B. Los 20 aislados con gránulos de PHA en el 65 95 % de las células nuevamente fueron llevadas a fermentación, alcanzando 0,174 0,889 g.g-1 de rendimiento Y (p/x). Se seleccionaron tres aislados con los mayores valores entre los que Halomonas sp. M4C1 desarrolló y sintetizó PHA en caldo HM2 con 5, 10, 15 y 20 g.L-1 de almidón como fuente de carbono, alcanzando 0,019; 0,016; 0,007 y 0,006 g.L-1 de PHA, con 0,177; 0,111; 0,056 y 0,066 g.L-1 de biomasa, después de 20, 40, 24 y 16 horas respectivamente. El mayor rendimiento de 0,144 g.g-1 le correspondió a 10 g.L-1 de almidón demostrándose que con esta concentración es factible la producción de PHA por las bacterias halófilas nativas
The aim of this study was to determine the concentration of starch Solanum tuberosum L. "potato" peels for the production of polyhydroxyalkanoates, PHA, from native halophilic bacteria as an alternative to reduce production costs of these biopolymers, possible replacements for petrochemical plastics. The bacteria were isolated of water samples of eight saline Lambayeque region and were enriched in HM1 broth at 30 °C with 5, 10, 15, 20, 25 and 30 g 100 mL-1 NaCl. Dilutions were performed subsequently, aliquots were taken and plated on HM1 agar, 203 isolates of halophilic bacteria were obtained, they were grown in HM2 broth with 10 g.L-1 glucose as carbon source and the 38.92% of the isolates showed PHA granules stained by Sudan Black B. Twenty bacteria with PHA granules in 65 - 75% over carried to fermentation, reaching between 0.174 to 0.889 g.g-1 of yield Y (p / x). Three isolates were selected with the highest values among which Halomonas sp M4C1 grew and synthesized PHA in HM2 broth with 5, 10, 15 and 20 g.L-1 of starch as carbon source, reaching 0.019; 0.016; 0.007 y 0.006 g.L-1 of PHA, with 0.177; 0.111; 0.056 and 0.066 g.L-1 of biomass after 20, 40, 24 and 16 hours respectively. The highest yield of 0.144 g.g-1 corresponded to 10 g.L-1 of starch demonstrating that this concentration is feasible PHA production by native halophilic bacteria

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Bacterias halófilas - PHA - bioplásticos - biopolímeros - almidón - Halophilic bacteria - bioplastics - biopolymers - starch

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Desempeño del Phaseolus vulgaris bajo riego parcial cultivado en un sistema de respuesta hidrogravitrópica / Performance of Phaseolus vulgaris under partial root-zone drying cultivated in a hydrogravitropic system response
Vega Ponce, Emil Cristhian;Mejía Marcacuzco, Jesús Abel
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):137-147 Please log in to see more details
En el área experimental de la UNALM (Lima-Perú) se evaluó sobre tratamientos de riego ... more
Desempeño del Phaseolus vulgaris bajo riego parcial cultivado en un sistema de respuesta hidrogravitrópica / Performance of Phaseolus vulgaris under partial root-zone drying cultivated in a hydrogravitropic system response
Scientia Agropecuaria. April 2017 8(2):137-147
En el área experimental de la UNALM (Lima-Perú) se evaluó sobre tratamientos de riego parcial (RPR300 y RPR500, ml) y riego completo (RC300 y RC500, ml control), el impacto del potencial xilemático (Yx) y la conductancia estomática (gs) en plantas de frijol común (Phaseolus vulgaris L.) cultivadas en sistemas (maceteros) de respuesta hidrogravitrópica. Se utilizó un diseño de bloques completos al azar con 12 plantas/maceteros por tratamiento en tres repeticiones. Para controlar la aplicación del riego y mantener el Yx en condiciones no letales (<-15 bar), se generó una curva de retención agua-suelo. Los valores de gs antes del riego (entre 217,18 y 268,67 mmol m-2 s-1) mostraron que únicamente en RPR500 las plantas se mantenían en óptimas condiciones hídricas, a pesar de los bajos valores de Yx (entre -9,92 y -7,33 bar); situación que pudo atribuirse a la capacidad de las raíces de sopesar los momentos en que la mitad de estas estructuras se encontraban en la sección del macetero donde la humedad del suelo estaba en un nivel bajo, mientras que la otra mitad se encontraba en la sección del macetero con un adecuado nivel hídrico del suelo
In the experimental area of the UNALM (Lima-Perú) was evaluated on partial root-zone drying irrigation treatments (RPR300 and RPR500, ml) and full irrigation (RC300 and RC500, ml control), the impact of xylem potential (Yx) and stomatal conductance (gs) in common bean plants (Phaseolus vulgaris L.) cultivated in systems (pots) of hydrogravitropic response. A randomized complete block design with 12 plants/pots per treatments was used in three replicates. To control the irrigation application and manage to maintain the Yx nonlethal conditions (<-15 bars), a water-soil retention curve was generated. The values of gs before irrigation (between 217.18 and 268.67 mm m-2 s-1) showed that only RPR500 plants were maintained under optimal water conditions, despite low levels of Yx (between -9.92 and -7.33 bar); situation that could be attributed to the ability of the roots to balance those moments when half of these structures were inside soil with low humidity, while the opposite half was favorable soil water level

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Phaseolus vulgaris L - potencial xilemático - potencial matricial del suelo - Conductancia estomática - Stomatal conductance - xylem water potential - soil water matric potential

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Influência do tamanho da semente na germinação e vigor de plântulas de populações de Camu-Camu / Influence of seed size on germination and vigor of seedlings of Camu-Camu
Mesquita Souza, Olisson;Smiderle, Oscar Jose;das Graças Souza, Aline;Alves ...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):119-125 Please log in to see more details
O camu-camu (Myrciaria dubia) é uma espécie frutífera nativa da Amazônia e sua importâ... more
Influência do tamanho da semente na germinação e vigor de plântulas de populações de Camu-Camu / Influence of seed size on germination and vigor of seedlings of Camu-Camu
Scientia Agropecuaria. April 2017 8(2):119-125
O camu-camu (Myrciaria dubia) é uma espécie frutífera nativa da Amazônia e sua importância econômica é comprovada devido ao fruto conter elevado teor de ácido ascórbico. O trabalho foi realizado com objetivo de avaliar a germinação e vigor de plântulas obtidas de sementes de diferentes tamanhos de duas populações de camu-camu. O delineamento experimental utilizado foi o inteiramente casualizado em esquema fatorial de 2 x 3 (duas procedências: rio Anauá e rio Urubu e três tamanhos de sementes: pequeno, médio e grande) com 5 repetições de 20 sementes por parcela. As sementes da procedência do rio Anauá, apresentaram maior massa (1,46 g) comparada com a procedência do rio Urubu (0,78 g). O percentual de emergência e velocidade de emergência de plântulas apresentaram melhores valores para a população do rio Anauá, justificando-se a adoção de escolha de procedência para a formação de mudas. Para comprimento do sistema radicular, massa seca da parte aérea e massa seca do sistema radicular, as sementes classificadas como média e grande oriundas do rio Anauá apresentaram maiores valores. As classes de massa das sementes apresentam um caractere importante para ser utilizado na produção de mudas de Myrciaria dubia. As sementes da procedência do rio Anauá são potencialmente mais vigorosas sendo indicadas para a produção de mudas de camu-camu (Myrciaria dubia)
Camu-camu (Myrciaria dubia) is a fruit species native to the Amazon and its economic importance is proven because the fruit contains high content of ascorbic acid. The objective of this work was to evaluate the germination and vigor of seedlings obtained from seeds of different sizes of two camu-camu populations. The experimental design was completely randomized in a factorial scheme of 2 x 3 (two provenances river Anauá and river Urubu and three seed sizes, small, medium and large) with 5 replicates of 20 seeds per plot. The seeds of the origin of the Anauá river presented higher mass (1.46 g) compared to the origin of the Urubu river (0.78 g). The speed and emergence of seed germination presented better values for the population of the Anauá river, justifying the adoption of choice of origin for the formation of seedlings. For root length, dry shoot mass and dry mass of the root system, the seeds classified as medium and large originated from the Anauá river presented higher values. The size of the seeds is an important character to be used in the production of Myrciaria dubia seedlings. The seeds of the origin of the Anauá river are potentially more vigorous are indicate for the production of camu-camu (Myrciaria dubia) seedling

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Myrciaria dubia - caracteres morfológicos - produção de mudas - massa de semente - propagação sexuada - seedling production - morphological characters - seed mass - propagation by seed

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Forage maize nutritional quality according to organic and inorganic fertilization
Moreno-Reséndez, Alejandro;Cantú Brito, Jesús Enrique;Reyes-Carrillo, José ...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):127-135 Please log in to see more details
Forage maize nutritional quality according to organic and inorganic fertilization
Scientia Agropecuaria. April 2017 8(2):127-135

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Crude protein - forage - milk yield - organic fertilizers

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SciELO

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Antecipação e retardamento de colheita nos teores de óleo e proteína das sementes de soja, cultivar Valiosa RR / Anticipation and harvest delay in oil and protein contents of soybean seeds, grow crops Valiosa RR
Finoto, Everton Luis;Sediyama, Tuneo;Alves de Albuquerque, José de Anchieta...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):99-107 Please log in to see more details
Objetivou-se com este trabalho avaliar a qualidade fisiológica e os teores de óleo e p... more
Antecipação e retardamento de colheita nos teores de óleo e proteína das sementes de soja, cultivar Valiosa RR / Anticipation and harvest delay in oil and protein contents of soybean seeds, grow crops Valiosa RR
Scientia Agropecuaria. April 2017 8(2):99-107
Objetivou-se com este trabalho avaliar a qualidade fisiológica e os teores de óleo e proteína de sementes de soja colhidas em diferentes estádios de desenvolvimento da planta e diferentes períodos de retardamento de colheita. A cultivar estudada foi a BRS Valiosa RR e o delineamento experimental foi de blocos casualizados, com três repetições. Foram estabelecidos 11 tratamentos, constituindo épocas diferentes de colheita nos estádios: R5.1, R5.3, R5.5, R6, R7.1, R7.3, R8.1, R9, R9+10 dias, R9+20 dias e R9+30 dias. A antecipação da colheita foi viabilizada por meio da aplicação, do herbicida Diquat (400 g ha-1) com pulverizador costal manual provido de bico "tipo leque" regulado para volume de calda de 300 L ha-1. Após a colheita, procedeu-se à avaliação da qualidade das sementes e à determinação dos teores de óleo e proteína. Constatou-se que o estádio R7.1 foi a época de colheita que apresentou maior porcentagem de germinação, demonstrando que a antecipação da colheita não provocou perda no vigor das sementes. Na fase de enchimento de grãos, os teores de óleo foram menores e os de proteína maiores. Ambos se estabilizaram a partir do estádio R7.1 até o R9 e apresentaram tendência de queda com o retardamento da colheita da soja
The objective of this work was to evaluate the physiological quality and oil and protein content of soybean seeds harvested in different stages of plant development and different periods of harvest delay. The cultivar studied was BRS Valiosa RR and the experimental design was of randomized blocks with three replications. Eleven treatments were established, constituting different times of harvest in the following stages: R5,1, R5,3, R5,5, R6, R7,1, R7,3, R8,1, R9, R9+10days, R9+20 days and R9+30 days. The anticipation of the harvest was made possible through the application in predetermined stages, of herbicide Diquat (400 g ha-1) with manual coastal spray with nozzle "type fan" set to volume of 300 L ha-1. After the harvest it was done the evaluation of physiological quality of seeds and the determination of the levels of oil and protein. It was noted that the stadium R7.1 was the harvest season that showed the highest percentage in the germination test, demonstrating that the anticipation of the harvest did not caused significant loss in seed vigor. At the grain filling stage, oil levels were lower and protein larger. Both stabilized from R7.1 to the R9 stadium and showed downward trend with the harvest delay

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - dessecação - estádios de desenvolvimento - Glycine max - melhoramento de plantas - desiccation - developmental stages - plant breeding

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Reserva de carbono en un sistema silvopastoril compuesto de Pinus patula y herbáceas nativas / Reserve of carbon in a silvopastoral system composed of Pinus patula and native herbaceous
Oliva, Manuel;Culqui Mirano, Lorenzo;Leiva, Santos;Collazos, Roicer;Salas, ...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):149-157 Please log in to see more details
La investigación tuvo como objetivo determinar la reserva de carbono retenida bajo un ... more
Reserva de carbono en un sistema silvopastoril compuesto de Pinus patula y herbáceas nativas / Reserve of carbon in a silvopastoral system composed of Pinus patula and native herbaceous
Scientia Agropecuaria. April 2017 8(2):149-157
La investigación tuvo como objetivo determinar la reserva de carbono retenida bajo un sistema silvopastoril con Pinus patula, localizado en Amazonas, Perú. Para la estimación de carbono se utilizaron 06 plantas mediante el método directo, los fustes fueron seccionados cada 2 metros y a partir de estos se obtuvieron muestras de 5 cm de espesor previo al pesaje total. Para las ramas y hojas se realizó el pesaje total y se seleccionaron muestras de 200 g. Para la recolección de muestras de hojarasca y herbáceas nativas, se utilizó el método del cuadrante y las muestras de suelo se recolectaron alrededor de cada planta. Los datos fueron obtenidos mediante la formulación de ecuaciones alométricas y selección de la mayor correlación estimada, a partir de variables como diámetro a la altura del pecho (DAP) y altura del fuste (AF). Como resultado, se encontró 92,13 t/ha de carbono almacenado y 337,20 t/ha de carbono equivalente. Además, la investigación permitió establecer una ecuación que ayudó a estimar la cantidad de carbono y CO2 en pino pátula: Biomasa seca = 0,6575*DAP1,1794 (r2 = 0,91)
The objective of the research was to determine the carbon reserve retained under a silvopastoral system with Pinus patula, located in Amazonas, Peru. For the carbon estimation, 06 plants were used by the direct method, the shafts were sectioned every 2 meters and from these were obtained samples of 5 cm of thickness prior to the total weighing. For the branches and leaves the total weight was weighed and samples of 200 g were selected. For the collection of leaf litter and native herbaceous samples, the quadrant method was used and soil samples were collected around each plant. The data were obtained through the formulation of allometric equations and selection of the highest correlation estimated, based on variables such as diameter at chest height (DAP) and height of the stem (AF). As a result, 92.13 t / ha of stored carbon and 337.20 t / ha of carbon equivalent were found. In addition, the research allowed to establish an equation that allows estimating the amount of carbon and CO2 in the pine tree: Dry biomass = 0.6575 * DAP1,1794 (r2 = 0.91)

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Ecuación alométrica - carbono almacenado - CO2 - Molinopampa pastos - Allometric equation - stored carbon - Molinopampa - pastures

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Estudo florístico de plantas daninhas em cultivos de melancia na Savana de Roraima, Brasil / Floristic study of weeds in watermelon crops in Savannah of Roraima, Brazil
Alves Albuquerque, José de Anchieta;Santos, Thatyele Sousa dos;Castro, Thaí...
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):91-98 Please log in to see more details
O município de Bonfim é considerado o segundo maior produtor de melancia do Estado e a... more
Estudo florístico de plantas daninhas em cultivos de melancia na Savana de Roraima, Brasil / Floristic study of weeds in watermelon crops in Savannah of Roraima, Brazil
Scientia Agropecuaria. April 2017 8(2):91-98
O município de Bonfim é considerado o segundo maior produtor de melancia do Estado e a incidência de plantas daninhas encontra-se como um dos fatores que mais afetam a qualidade e produtividade da cultura. Objetivou-se com este trabalho estudar floristicamente as plantas daninhas em cultivos de melancia no município de Bonfim, na savana Roraimense. A pesquisa foi realizada em 10 propriedades, com uma área em torno de 40 ha de plantio comercial de melancia. Para a coleta das plantas daninhas utilizou-se um quadrado de ferro vazado com dimensão de 0,50 x 0,50 m, sendo lançado aleatoriamente na área. Foram identificadas a nível de gênero, espécie, família e classe botânica. Foram calculados os parâmetros fitossociológicos: frequência, densidade, abundância, frequência relativa, densidade relativa, abundancia relativa e índice de valor de importância relativo. Foram ainda avaliadas o ciclo de vida, hábito de crescimento, método de propagação e a rota fotossintética das espécies invasoras. A composição da comunidade infestante de plantas daninhas na área levantada foi considerada heterogênea, apresentando 17 espécies distribuídas em 10 famílias botânicas. As famílias com maior ocorrência foram as Poaceae e Fabaceae. Os gêneros Digitaria e Sida apresentaram o maior número de espécies. A maioria das plantas daninhas identificadas propaga-se exclusivamente por sementes, apresentam ciclo de vida anual e a rota fotossintética C3
The municipality of Bonfim is the second largest watermelon producer in the state and the incidence of weeds is as one of the factors that most affect the quality and crop productivity. The objective of this work was to study floristically weeds in watermelon crops in the municipality of Bonfim, in Roraimense savannah. The survey was conducted in 10 properties with an area of around 40 ha commercial planting watermelon. To collect the weeds used a square cast iron with dimensions of 0.50 x 0.50 m, being released randomly in the area. They were identified to genus, species, family and botany class. the phytosociological parameters were calculated: frequency, density, abundance, relative frequency, relative density, relative abundance and relative importance value index. There were also evaluated the life cycle, growth habit, propagation method and the photosynthetic pathway of invasive species. The composition of the infesting weed community in the raised area was considered heterogeneous, with 17 species in 10 plant families. Families with higher incidence were Poaceae and Fabaceae. The Digitaria and Sida genres had the highest number of species. Most of the identified weed spreads only by seed have annual life cycle and the C3 photosynthetic pathway

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Citrullus lanatus (L.) - plantas infestantes - fitossociologia - morfologia vegetal - savana - weeds - phytosociology - plant morphology - savannah

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Prediction of beef marbling using Hyperspectral Imaging (HSI) and Partial Least Squares Regression (PLSR)
Aredo, Victor;Velásquez, Lía;Siche, Raúl
Academic Journal Academic Journal | Scientia Agropecuaria. April 2017 8(2):169-174 Please log in to see more details
The aim of this study was to build a model to predict the beef marbling using HSI and ... more
Prediction of beef marbling using Hyperspectral Imaging (HSI) and Partial Least Squares Regression (PLSR)
Scientia Agropecuaria. April 2017 8(2):169-174
The aim of this study was to build a model to predict the beef marbling using HSI and Partial Least Squares Regression (PLSR). Totally 58 samples of longissmus dorsi muscle were scanned by a HSI system (400 - 1000 nm) in reflectance mode, using 44 samples to build the PLSR model and 14 samples to model validation. The Japanese Beef Marbling Standard (BMS) was used as reference by 15 middle-trained judges for the samples evaluation. The scores were assigned as continuous values and varied from 1.2 to 5.3 BMS. The PLSR model showed a high correlation coefficient in the prediction (r = 0.95), a low Standard Error of Calibration (SEC) of 0.2 BMS score, and a low Standard Error of Prediction (SEP) of 0.3 BMS score

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - hyperspectral image - marbling - partial least squares - prediction

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Influência do estádio de maturação na qualidade físico-química de frutos de umbu (Spondias tuberosa) / Influence of the maturation stage on the physical-chemical quality of fruits of umbu (Spondias tuberosa)
Santos de Menezes, Pedro Henrique;Souza, Adalgisa Aranha de;Silva, Edgley S...
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):73-78 Please log in to see more details
A colheita em estádios adequados de maturação é determinante na manutenção da qualidad... more
Influência do estádio de maturação na qualidade físico-química de frutos de umbu (Spondias tuberosa) / Influence of the maturation stage on the physical-chemical quality of fruits of umbu (Spondias tuberosa)
Scientia Agropecuaria. January 2017 8(1):73-78
A colheita em estádios adequados de maturação é determinante na manutenção da qualidade pós-colheita de frutos de umbu. Nesse sentido objetivou-se com esse trabalho determinar a influência do estádio de maturação na qualidade físico-química de frutos de umbu procedentes do nordeste brasileiro. O experimento foi conduzido no Laboratório de Tecnologia de Alimentos do Centro Ciências Agrárias da Universidade Federal de Roraima, município de Boa Vista, Roraima, Brasil. O delineamento experimental utilizado foi o inteiramente casualizado com dez repetições e um fruto por unidade experimental. Os tratamentos constaram de três estádios de maturação dos frutos: verdes, de vez e maduros. As características físicas avaliadas foram: comprimento do fruto, diâmetro do fruto, massa de semente, massa da casca, massa da polpa, massa total e rendimento de polpa. Na determinação da qualidade química avaliou-se: o pH, o teor de sólidos solúveis, a acidez titulável e a relação sólidos solúveis/acidez titulável. Concluiu-se que os estádios de maturação dos frutos de umbu exercem diferentes capacidades de resposta quanto a sua biometria. Frutos de umbu no estádio verde possuem maior massa e por consequência maior rendimento de polpa. A qualidade de frutos de umbu não é influenciada pelos diferentes estádios de maturação dos frutos
Harvesting at suitable maturation stages is determinant in maintaining post-harvest quality of umbu fruit. In this sense, the aim of this work was to determine the influence of the maturation stage on the physical- chemical quality of umbu fruits from the brazilian northeast. The experiment was conducted at the Food Technology Laboratory of the Agrarian Sciences Center of the Federal University of Roraima, Boa Vista, Roraima, Brazil. The experimental design was a completely randomized design with ten replicates and one fruit per experimental unit. The treatments consisted of three maturation stages of the fruits: green, once and ripe. The physical characteristics evaluated were: fruit length, fruit diameter, seed mass, bark mass, pulp mass, total mass and pulp yield. The determination of the chemical quality was evaluated: pH, soluble solids content, titratable acidity and soluble solids / titratable acidity ratio. It was concluded that the stages of maturation of umbu fruits exert different response capacities regarding their biometry. Fruits of umbu in the green stage have higher mass and consequently higher yield of pulp. The fruit quality of umbu is not influenced by the different maturation stages of the fruits

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Spondias tuberosa - rendimento de polpa - massa da semente - qualidade físico-química - pós-colheita - pulp yield - seed weight - after harvest

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Nematodos fitoparásitos asociados al cultivo de piña (Ananas comosus) en Amazonas, Perú / Plant parasitic nematodes associated with pineapple cultivation(Ananas comosus) in Amazonas, Peru
Vera Obando, Nora Yessenia;Maicelo Quintana, Jorge Luis;Heredia, Eugenio Gu...
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):79-84 Please log in to see more details
El presente trabajo tuvo como objetivo identificar los principales géneros de nematodo... more
Nematodos fitoparásitos asociados al cultivo de piña (Ananas comosus) en Amazonas, Perú / Plant parasitic nematodes associated with pineapple cultivation(Ananas comosus) in Amazonas, Peru
Scientia Agropecuaria. January 2017 8(1):79-84
El presente trabajo tuvo como objetivo identificar los principales géneros de nematodos fitoparásitos asociados al cultivo de piña (Ananas comosus) y sus respectivos porcentajes de ocurrencia (frecuencias) y densidades poblacionales promedio. Se analizaron muestras de suelo y raíces colectadas de 28 campos de piña en la provincia de Rodríguez de Mendoza, ubicadas entre 1796 y 1936 m.s.n.m. Las muestras fueron procesadas por duplicado mediante el método de Baerman modificado en bandeja, utilizando 50 cc. de suelo y 5 g de raíces. En las muestras de suelo, se identificaron once géneros de nematodos fitoparásitos asociados al cultivo de piña. El género Helicotylenchus fue encontrado en todos los campos evaluados y presentó mayores promedios poblacionales en muestras de suelo y raíces (24,5 y 3,9 respectivamente). El presente trabajo constituye el primer estudio de identificación de nematodos fitoparásitos en el cultivo de piña en el departamento de Amazonas y nos brinda información que permitirá establecer futuras estrategias para el control de éstos nematodos fitoparásitos
The present study aimed to identify the main genera of plant parasitic nematodes associated with the pineapple crop (Ananas comosus) and their respective percentages of occurrence (frequencies) and average population densities. Soil and root samples were collected from twenty eight pineapple fields in the province of Rodríguez de Mendoza, located between 1796 and 1936 meters above sea level. Sample were processed in duplicate by the method of modified Baerman on tray, using 50 cc. of soil and 5 g of root. In soil samples, eleven genera of plant parasitic nematodes associated with pineapple crop were identified. The genus Helicotylenchus was found in all evaluated fields and presented higher population averages in soil and root samples (24.5 and 3.9 respectively). This work is the first study to identify plant parasitic nematodes in pineapple cultivation in the department of Amazonas and provides us with information that will establish future strategies for controlling these plant parasitic nematodes

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Helicotylenchus - Pratylenchus - Baerman - identificación - fitonematodo - Helicothylencus - Pratylencus - identification - plant-nematode

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Influencia de antioxidantes en la estabilidad oxidativa del aceite de chia (Salvia hispanica L.) por rancimat / Influence of antioxidants on oxidative stability of the oil Chia (Salvia hispanica L.) by rancimat
Villanueva, Eudes;Rodríguez, Gilbert;Aguirre, Elza;Castro, Víctor
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):19-27 Please log in to see more details
La rancidez oxidativa, conocida como autooxidación, es la principal causa de deterioro... more
Influencia de antioxidantes en la estabilidad oxidativa del aceite de chia (Salvia hispanica L.) por rancimat / Influence of antioxidants on oxidative stability of the oil Chia (Salvia hispanica L.) by rancimat
Scientia Agropecuaria. January 2017 8(1):19-27
La rancidez oxidativa, conocida como autooxidación, es la principal causa de deterioro de aceites y grasas, la que puede controlarse mediante el empleo de antioxidantes incrementando la estabilidad oxidativa y vida en anaquel. El aceite de chía es rico en ácidos grasos poli-insaturados (PUFAs), particularmente en omega-3 (ω-3) y omega-6 (ω-6) beneficiosas para la salud humana, pero también los PUFAs favorecen a la reacción de autooxidación. El objetivo de este trabajo fue determinar el efecto de antioxidantes sintéticos y de origen natural a concentración de 200 ppm de etoxiquina (EQ), butilhidrixianisol (BHA), butilhidroxitolueno (BHT) y fortium (FT), sobre el índice de estabilidad oxidativa (OSI) del aceite de chía por rancimat a diferentes temperaturas (90, 100 y 110 °C). El método rancimat está incluido en los estándares AOCS Cd 12b-92, debido a su facilidad de uso y reproducibilidad permite evaluar el OSI en un periodo relativamente corto. Los resultados muestran que entre el BHT y EQ, así como entre el BHA y FT no presentan diferencia estadísticamente significativa (p ≤ 0,05). Siendo el BHT el antioxidante que incrementó en mayor proporción el OSI del aceite de chía, con un factor de protección (FP) de 1,30, 1,26 y 1,29 para las diferentes temperaturas aplicadas y con una energía de activación (Ea) de 82,75 kJ/mol, por lo tanto, se recomendaría su uso.
Oxidative rancidity, known as autoxidation, is the main cause of deterioration of oils and fats, which can be controlled by the use of antioxidants increasing oxidative stability and shelf life. Chia oil is rich in polyunsaturated fatty acids (PUFAs), particularly omega-3 (ω-3) and omega-6 (ω-6) beneficial to human health, but PUFAs also favor the reaction of Autoxidation. The aim of this work was to determine the effect of natural and synthetic antioxidants at the concentration of 200 ppm of ethoxyquin (EQ), butylhydrixyanisol (BHA), butylhydroxytoluene (BHT) and fortium (FT), on the oxidative stability index (OSI) of chia oil per rancimat at different temperatures (90, 100 and 110 °C). The rancimat method is included in the AOCS Cd 12b-92 standards, because of its ease of use and reproducibility allows evaluating the OSI in a relatively short period. The results show that between BHT and EQ, as well as between BHA and FT, did not present a statistically significant difference (p ≤ 0.05). The BHT being the antioxidant that increased the chia oil OSI, with a protection factor (PF) of 1.30, 1.26 and 1.29 for the different temperatures applied and with an activation energy (Ea) of 82.75 kJ / mol, therefore, its use would be recommended.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - aceite de chía - índice de estabilidad oxidativa - factor de protección - energía de activación - rancimat - chia oil - oxidative stability index - protection factor - activation energy

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Detección temprana de resistencia a Mycosphaerella fijiensis en genotipos locales de Musáceas en Ecuador / Early detection of resistance to Mycosphaerella fijiensis in local genotypes of Musa in Ecuador
Cedeño García, Galo;Suarez Capello, Carmen;Vera Coello, Danilo;Fadda, Carlo...
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):29-42 Please log in to see more details
El objetivo de la investigación fue determinar la reacción de 14 genotipos de musáceas... more
Detección temprana de resistencia a Mycosphaerella fijiensis en genotipos locales de Musáceas en Ecuador / Early detection of resistance to Mycosphaerella fijiensis in local genotypes of Musa in Ecuador
Scientia Agropecuaria. January 2017 8(1):29-42
El objetivo de la investigación fue determinar la reacción de 14 genotipos de musáceas frente a Mycosphaerella fijensis, agente causal de la Sigatoka negra. Se condujeron dos experimentos en el Departamento de Protección Vegetal de la Estación Experimental Pichilingue del Instituto Nacional de Investigaciones Agropecuarias (INIAP), Ecuador. Los genotipos evaluados fueron: banano Orito (AA), Guineo de jardín, Williams, Filipino, Gros Michel, Mulato y Morado, del genoma (AAA), y los plátanos Limeño, Maqueño, Dominico, Dominico-Hartón, Dominico gigante, Dominico negro y Barraganete, del genoma AAB. Se usaron dos métodos de inoculación: a) in vitro sobre fragmentos de hoja con una suspensión de conidios y b) inoculación de plántulas de ocho semanas de edad con una suspensión micelial. En el primer caso se midió el periodo de incubación (PI) y el número de lesiones a los 14 y 20 días después de la inoculación (DDI). En invernadero, se registró el PI, tiempo de evolución de síntomas (TES) y tiempo de desarrollo de la enfermedad (TDE). Se determinaron diferencias estadísticas significativas (p ≤ 0,05) para todas las variables evaluadas; los cultivares Orito (AA) y Limeño (AAB) calificaron como resistentes, mientras que todos los demás fueron susceptibles, aunque mostraron un rango de variabilidad en la respuesta a las inoculaciones.
The aim of this research was to determine resistance reaction of 14 Musa genotypes against Mycosphaerella fijensis, causal agent of Black Sigatoka disease. Two experiments were conducted in laboratory and shadehause at Pichilingue research Station from the National Institute of Agricultural Research (INIAP), Ecuador. Genotypes considered were: Orito (AA), Guineo de jardín, Williams, Filipino, Gross Mitchel, Mulato and Morado, (AAA); Limeño, Maqueño, Dominico, Dominico-Hartón, Dominico gigante, Dominico negro and Barraganete from the AAB genome. Two inoculation methods were used to asses’ resistance: a) in vitro inoculation over leaf fragments with a conidial suspension, and b) inoculation of eight weeks old seedlings with a mycelial suspension of the fungus. In the first case, the incubation period (IP) and the number of lesions at 14 and 20 days after inoculation (DDI) were measured. For in vitro trial, the incubation period (IP) and the number of leaf lesions 14 and 20 days after inoculation (DDI) were measured, and for seedlings, PI, period of symptoms evolution (TES) and time for disease development (TDE) were recorded. Statistically significant (p ≤ 0.05) differences were found for all variables. Cultivars Orito (AA) and Limeño (AAB) qualify as resistant while all the others were susceptible, though response to inoculation within the latter group showed a range of variability.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - cultivares de Musa - inoculación - inóculo - resistencia - biodiversidad - Musa cultivars - inoculatión - inóculum - resistance - biodiversity

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Composición proximal y propiedades funcionales del surimi liofilizado de Dosidicus gigas 'calamar gigante' / Proximal composition and functional properties of lyophilizated surimi of Dosidicus gigas 'jumbo squid'
Solari-Godiño, Armando;Córdova-Ramos, Javier S.;Pilco-Quesada, Silvia;Cerró...
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):57-62 Please log in to see more details
El propósito de la investigación fue determinar la composición proximal y propiedades ... more
Composición proximal y propiedades funcionales del surimi liofilizado de Dosidicus gigas 'calamar gigante' / Proximal composition and functional properties of lyophilizated surimi of Dosidicus gigas 'jumbo squid'
Scientia Agropecuaria. January 2017 8(1):57-62
El propósito de la investigación fue determinar la composición proximal y propiedades funcionales del surimi liofilizado de calamar gigante (Dosidicus gigas). Se elaboró surimi a partir de calamar gigante y fue liofilizado hasta obtener surimi en polvo para evaluar sus características y propiedades funcionales. El contenido de proteínas fue 58,7% y carbohidratos 30,5%. La solubilidad proteica en agua y sal (3%) fueron 21,1% y 40,6% respectivamente, siendo estos valores superiores a surimi en polvo de especies comerciales. La capacidad de gelificación fue 2,4% y la capacidad emulsificante fue 79,9% a una concentración del 1,0%. El color en la escala de Hunter fue L*: 91,5; a*: 0,5; b*:7,0. El surimi en polvo de calamar gigante fue considerado como un polvo proteico funcional debido a su contenido porcentual proteico, y tuvieron buenas características tecnológicas y de gran potencial en la industria alimentaria
The purpose of the research was to determinate proximal composition and functional properties of the giant squid freeze-dried surimi (Dosidicus gigas). Surimi elaborated from giant squid and it lyophilized until obtaining surimi powder to evaluate its characteristics and functional properties. The protein content was 58.7% and carbohydrate 30.5%. Protein solubility in water and salt (3%) were 21.1% and 40.6% respectively, these values being higher than surimi powder of commercial species. The gelling capacity was 2.4% and the emulsifying capacity was 79.9% at a concentration of 1.0%. The color on the Hunter scale was L*: 91.5; a*: 0.5; b*: 7.0. Giant squid powder surimi considered as a functional protein powder due to its percentage protein content, and had good technological characteristics and great potential in the food industry

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - surimi - calamari gigante - Dosidicus gigas - propiedades funcionales proteicas - jumbo squid - protein functional properties

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Purificación y caracterización preliminar de proteasas del látex de Vasconcellea candicans (A. Gray) A. DC (Mito) / Purification and preliminary characterization of latex proteases of Vasconcellea candicans (A. Gray) A. DC (Mito)
Gutiérrez, Ana I. F;Nolasco, Oscar;Santa Cruz, Carlos
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):7-17 Please log in to see more details
Estudios preliminares indican que, el látex fresco del "Mito" tiene una actividad espe... more
Purificación y caracterización preliminar de proteasas del látex de Vasconcellea candicans (A. Gray) A. DC (Mito) / Purification and preliminary characterization of latex proteases of Vasconcellea candicans (A. Gray) A. DC (Mito)
Scientia Agropecuaria. January 2017 8(1):7-17
Estudios preliminares indican que, el látex fresco del "Mito" tiene una actividad específica de papaína de 1,84 veces mayor a la encontrada en el látex of papaya, por lo que el objetivo de este trabajo fue purificar y caracterizar las proteasas del látex fresco del "Mito" que tuvieran actividad de papaína. El extracto crudo de proteasas se obtuvo a partir del látex de "Mito" el cual fue resuspendido (1:1) en buffer acetato de Na 10 mM a pH 5,0; inmediatamente se precipitaron proteínas a pH 9,0 y luego con sulfato de amonio al 45%. Posteriormente se purificó en una columna de Sephadex G-100 y se obtuvieron tres fracciones: A, B y C; utilizando como sustrato caseína se midió la actividad enzimática específica (AEE). Se encontró que para la Fracción A la AEE fue de 87,74 nkat.mg-1proteína, para la Fracción B fue de 14,93 nkat.mg-1proteína y para la Fracción C fue de 16,13 nkat.mg-1proteína. La AEE de la fracción A frente a la de papaína de látex fresco de C. papaya fue 13,3 veces mayor. En el análisis electroforético (gel desnaturalizante, 12%) se observa para la fracción A dos bandas de proteínas teniendo una de ellas una "relación de frente" semejante al estándar de papaína. Además, se observó que la fracción A (papaína de "Mito") frente a diferentes concentraciones de caseína, usada como sustrato, presenta una curva sigmoidea michaeliana; a diferentes volúmenes de enzima se muestra un comportamiento lineal; tiene un pH óptimo a 7,5 y es activa hasta 60 ºC
Preliminary studies indicate that, the "Mito" fresh latex, has a specific activity of papain from 1.84 times greater than that found in the latex of papaya, so the objective of this study was to purify and characterize "Mito" fresh latex proteases that have activity of papain. The crude extract protease was obtained from the "Mito" latex which was re-suspended (1:1) in 10 mM Na acetate buffer at pH 5.0; immediately proteins were precipitated at pH 9.0 and then with 45% ammonium sulfate. Subsequently, the proteins were purified on a Sephadex G-100 column and were three fractions: A, B and C. Using as a substrate casein, the enzymatic specific activity (ESA) was measured and was found to be the fraction A was 87.74 nkat.mg-1protein, for fraction B was 14.93 nkat.mg-1protein and for fraction C it was 16.13 nkat.mg-1protein. ESA of fraction A against papain of fresh latex of C. papaya was 13.3 times greater. Electrophoretic analysis (12% denaturant gel) shows for A fraction, two protein bands having one of them a relation similar to the papain standard. In addition, there was observed that the A fraction (papain of "Mito") against different concentrations of casein, used as a substrate, displays a michaeliane sigmoid curve; different volumes of enzyme shows a linear behavior; it has an optimum pH of 7.5 and is active up to 60 °C

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Lomas de Perú - papaya silvestre - látex - papaína - Vasconcella candicans (A. Gray) - Hills of Peru - wild papaya - latex - papain - Vasconcellea candicans (A. Gray)

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Caracterización morfológica de variedades de vid para producción de Pisco bajo condiciones de la zona media del valle de Ica, Perú / Morphological characterization of grapevine varieties for Pisco production under conditions of the middle zone of the...
Cáceres, H.;Quispe, P.;Pignataro, D.;Orjeda, G.;Lacombe, T.
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):63-72 Please log in to see more details
El estudio consiste en la caracterización morfológica de las ocho variedades de uvas p... more
Caracterización morfológica de variedades de vid para producción de Pisco bajo condiciones de la zona media del valle de Ica, Perú / Morphological characterization of grapevine varieties for Pisco production under conditions of the middle zone of the...
Scientia Agropecuaria. January 2017 8(1):63-72
El estudio consiste en la caracterización morfológica de las ocho variedades de uvas pisqueras "Torontel, Italia, Mollar, Quebranta, Negra criolla, Albilla, Moscatel y Uvina" cultivadas en el CITEagroindustrial. Se utilizó la lista de descriptores de la Organización Internacional de la Viña y del Vino para variedades de vid y especies de Vitis versión 2009. Algunos de los caracteres ampelográficos como el color y forma de las bayas del estado fenológico de maduración es información generalizada; sin embargo, al evaluar los 56 descriptores en otros estados fenológicos se observan diferencias. Por lo tanto, la descripción de las variedades que se muestran aportan una mayor precisión a la caracterización y sirven de guía a los productores de Pisco y productores de uvas para la sencilla y correcta identificación en campo de sus plantas, ya que existe confusión en la identificación de las distintas variedades, como la homonimia y la identificación incorrecta de variedades
This work consists in the morphological characterization of eight Pisco grapes varieties "Torontel, Italia, Mollar, Quebranta, Negra criolla, Albilla, Moscatel and Uvina" cultivated in the CITEagroindustrial, based on the International Organization of Vine and Wine (OIV) list of descriptors for vine varieties and Vitis species, version 2009. Some ampelographic characters such as berry color and shape during the phenological stage are general knowledge, however the 56 descriptors in different phenological stages highlight differences. Therefore, the description of the varieties provides a greater precision to the characterization and serves as a guide to the producers of Pisco and producers of grapes, for a simple and correct identification of their plants in the field, avoiding the confusion that currently exists in the Identification of the different varieties, such as homonymy and incorrect identification

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - vid - Pisco - Ica - Perú - ampelografía - Peru - ampelography

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Efecto de la intensidad de diodos electroluminosos y fotoperiodo en la optimización de la producción de biomasa de Spirulina (Arthrospira) / Effect of the light emitting diodes intensity and photoperiod in the optimization of the Spirulina (Arthrospira)...
Vásquez-Villalobos, V;Vergaray, D;Méndez, J;Barrios, I;Baquedano, R;Caldas,...
Academic Journal Academic Journal | Scientia Agropecuaria. January 2017 8(1):43-55 Please log in to see more details
Se optimizó la producción de biomasa (ф) de cultivos batch de Spirulina sp. en fotobio... more
Efecto de la intensidad de diodos electroluminosos y fotoperiodo en la optimización de la producción de biomasa de Spirulina (Arthrospira) / Effect of the light emitting diodes intensity and photoperiod in the optimization of the Spirulina (Arthrospira)...
Scientia Agropecuaria. January 2017 8(1):43-55
Se optimizó la producción de biomasa (ф) de cultivos batch de Spirulina sp. en fotobiorreactores a escala de laboratorio (FBL) de 0,2 L, por efecto de X1: intensidad de diodos electroluminosos (LED’s) entre 1,25 a 41,7 klux y X2: fotoperiodo de 12/12 a 24/0, h de luz/h de oscuridad (L/O) utilizando un diseño compuesto central rotacional (DCCR) y metodología de superficie de respuesta (MSR). Asimismo, se evaluaron las características hidráulicas y el valor ф de un cultivo batch de Spirulina en un fotobiorreactor de canal bucle cerrado abierto a la atmósfera (FB-BCAA) por efecto de la iluminación LED de 8,3±1,9 klux y fotoperiodos de 12/12 y 24/0 h L/O. En los FBL se encontró dos zonas óptimas de ф, ambas con una intensidad LED de 21,5 klux y fotoperiodos 12/12 y 24/0 h L/O, siendo los valores ф de 1,65 y 1,62 respectivamente. El modelo matemático que indicó estas zonas fue de segundo orden (p = 0,000396 < 0,05) con una consistencia de predicción de R² = 0,92. En el FB-BCAA, el cultivo de Spirulina sp. con fotoperiodo de 12/12 h L/O, mostró un valor ф de 0,72, una adaptación más rápida de λ = 4,62 h, una mayor velocidad específica de crecimiento de μmax= 0,033 h-1 y menor tiempo de consumo de energía de 74,05 h; comparado con el cultivo desarrollado con fotoperiodo 24/0 h L/O. Los parámetros hidráulicos del FB-BCAA fueron: volumen de operación 2,5 L, velocidad de flujo 0,26 m/s, números de Reynolds (Re) 15488, Froude (Fr) 0,60 y Vedernikov (Ved) 0,90.
Biomass (ф) production from Spirulina sp. batch cultures was optimized in laboratory scale photobioreactors (LPB) of 0.2 L, by the effect of X1: intensity of light emitting diodes (LEDs) and X2: photoperiod, between 1.25-41.7 klux and 12/12-24/0 hours of light/dark (L/D) respectively using a central composite rotational design (CCRD) and response surface methodology (RSM). The hydraulic characteristics and ф value from Spirulina batch cultures were also evaluated in a closed-loop channel photobioreactor open to the atmosphere (PB-CLOA) by the effect of the lighting LED of 8.3±1.9 klux and photoperiod of 12/12 and 24/0 h L/D. Two optimal zones of ф in LPB were identified, both with a 21.5 klux LED intensity and photoperiod relationship of 12/2 and 24/0 h L/D, with values of 1.65 and 1.62 ф respectively. The mathematical model which indicated the optimal zones was of 2nd order, which had a high significance (p = 0.000396 < 0.05) achieving a predictive value of R2 = 0.92. In the PB-CLOA, the cultivation of Spirulina sp. with photoperiod of 12/12 h L/D, showed a ф value of 0.72, a more rapid adaptation of λ = 4.62 h, a higher specific growth rate of μmax=0.033 h-1 and reduced time energy consumption of 74.05 h; compared to culture developed with photoperiod 24/0 h L/D. The PB-CLOA hydraulic parameters were: operation volume 2.5 L, flow velocity 0.26 m/s, numbers of Reynolds (Re) 15488, Froude (Fr) 0.60 and Vedernikov (Ved) 0.90.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Spirulina - fotobiorreactor - LED - optimización - fotoperiodo - air-lift - hold-up - photobioreactor - optimization - photoperiod

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La agrobiodiversidad en várzea y su función económica en la Amazonía Peruana / Agrobiodiversity in the floodplains and its economic function in the Peruvian Amazon
Rios Arévalo, Michelly;Camacho Palomino, Edwin
Academic Journal Academic Journal | Scientia Agropecuaria. October 2016 7(4):377-389 Please log in to see more details
El artículo tiene como objeto estudiar la práctica sostenible y la función económica d... more
La agrobiodiversidad en várzea y su función económica en la Amazonía Peruana / Agrobiodiversity in the floodplains and its economic function in the Peruvian Amazon
Scientia Agropecuaria. October 2016 7(4):377-389
El artículo tiene como objeto estudiar la práctica sostenible y la función económica de la agrobiodiversidad en los ambientes más inestables de la várzea, las "playas" y "barreales". El estudio fue realizado en siete comunidades del "Sector Muyuy" próximo a la ciudad de Iquitos en 2004. Este estudio también compara la agrobiodiversidad de una comunidad en 1999. La metodología usada es el mismo aplicado por el Proyecto "People, Land Management and Environmental Change" de la Universidad de las Naciones Unidas, que prioriza la experimentación, demostración y explicación de los sistemas agrícolas por los propios agricultores. Los resultados muestran que los sistemas agrícolas en playas y barreales varían según el tipo de sedimentación anual. En 2004 se promocionó el crédito agrícola para arroz. La agrobiodiversidad en playas y barreales fue constituida por 9 cultivos en 1999 y 2 cultivos en 2004. La diversidad aumenta con los cultivos inundados por el rio, generando ambientes de protección y alimentación de diferentes peces y la tortuga cupiso. Los sistemas agrícolas empleados contienen estrategias de minimización del riesgo sobre el "pulso del rio", utilizándose generalmente cultivos de corto periodo vegetativo en las áreas de mayor riesgo de inundación. Finalmente, la función económica de la agrobiodiversidad está direccionada al consumo y a la comercialización. La diversidad acuática genera un complemento económico para los agricultores
The aim of the article is to study the sustainable practice and the economic role of the agricultural biodiversity in the more unstable environments of the floodplains, the "sand bars" and "silt bars". The study was carried out in seven communities of the "Setor Muyuy" near the town of Iquitos in 2004. This study also compares the agrobiodiversity of a community in 1999. The methodology used is the same applied by the "People, Land Management and Environmental Change" from United Nations University, which prioritizes experimentation, demonstration and explication of the agricultural systems by farmers themselves. The results show the agricultural systems of sand bars and silt bars vary according to the type of annual sediment. In 2004, agricultural credit is promoted for rice. The agricultural biodiversity in sand bars and silt bars comprised 9 cultures in 1999 and 2 cultures in 2004. The diversity increases among cultures inundated by the river, generating an environment of protection and food for different fish and turtles. The agricultural system have strategies for the minimization of the risk of "river pulse", generally with species cultivated have a short vegetative in the areas of greatest risk of flooding. Finally, the economic role of agricultural biodiversity is aimed for consumption and commercialization. The aquatic diversity generates a complementary economy for the agricultural workers

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - playas - barreales - sistemas agrícolas - crédito agrícola - riesgos - sand bars - silt bars - agricultural systems - agricultural credit - risks

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Isotherms and isosteric heat of sorption of two varieties of Peruvian quinoa
Pumacahua-Ramos, Augusto;Gomez Vieira, José Antonio;Telis-Romero, Javier;Vi...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2016 7(4):409-417 Please log in to see more details
The isosteric heats of sorption of two varieties of quinoa (Chenopodium quinoa Willd.)... more
Isotherms and isosteric heat of sorption of two varieties of Peruvian quinoa
Scientia Agropecuaria. October 2016 7(4):409-417
The isosteric heats of sorption of two varieties of quinoa (Chenopodium quinoa Willd.) grain were determined by the static gravimetric method at four temperatures (40, 50, 60 and 70 °C) and in relative humidity environments provided by six saturated salt solutions. Six mathematical equations were used to model the experimental data: GAB, Oswin, Henderson, Peleg, Smith and Halsey. The isosteric heat of sorption was determined using the parameters of the GAB model. All the equations were shown to be appropriate by the coefficients of determination (R2) and the mean absolute error (MA%E). The influence of temperature was observed because the adsorption of water by the grains was lower at higher temperatures. The equilibrium moisture contents for security of storage, for long periods of time at water activity lower than 0.65, were 12 - 13%. The effect of temperature on the parameters of the GAB model was analysed using the exponential Arrhenius equation. The isosteric heats of sorption were determined by applying the Clausius-Clapeyron equation as a function of humidity. The isosteric heat at 5% moisture for grains of the Blanca de Juli variety was 3663 kJ/kg and for the Pasankalla variety it was 3393 kJ/kg. The experimental data for isosteric heat as a function of humidity were satisfactorily modelled using three mathematical equations

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Quinoa grains - moisture security - sorption isotherms - isosteric heat of sorption - mathematical models

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Flavonoides extraídos de la cascara de naranja tangelo (Citrus reticulata x Citrus paradisi) y su aplicación como antioxidante natural en el aceite vegetal sacha inchi (Plukenetia volubilis) / Flavonoids extracted from orange peelings tangelo (Citrus...
Tenorio Domínguez, Matilde
Academic Journal Academic Journal | Scientia Agropecuaria. October 2016 7(4):419-431 Please log in to see more details
La investigación tuvo como objetivo obtener extractos de flavonoides de la cáscara de ... more
Flavonoides extraídos de la cascara de naranja tangelo (Citrus reticulata x Citrus paradisi) y su aplicación como antioxidante natural en el aceite vegetal sacha inchi (Plukenetia volubilis) / Flavonoids extracted from orange peelings tangelo (Citrus...
Scientia Agropecuaria. October 2016 7(4):419-431
La investigación tuvo como objetivo obtener extractos de flavonoides de la cáscara de naranja tangelo (Citrus reticulata x Citrus paradisi) y aplicarlos como, antioxidante natural en el aceite vegetal Sacha inchi (Plukenetia volubilis). La información se obtuvo de las pruebas experimentales, que se realizó en siete etapas: caracterización física y química de la naranja tangelo y del aceite vegetal sacha inchi, obtención de los extractos de flavonoides por soxhlet , detección de los flavonoides de cada extracto por cromatografía de capa fina y cromatografía de papel, identificación y cuantificación de los flavonoides por cromatografía líquida de alta resolución (HPLC), determinación de la capacidad antioxidante de cada extracto de flavonoide y finalmente se evaluó la actividad antioxidante en el aceite sacha inchi, del extracto que tuvo la mayor capacidad antioxidante, para lo cual se utilizó un diseño multifactorial con dos factores : extractos de flavonoides y concentración con tres niveles: 0,05%; 0,1% y 0,15% y 16 bloques que son los tiempos. Los resultados mostraron que en el extracto acuoso se encontró la mayor cantidad de flavonoides: 100,3724 mg/g, siendo la naringina con 81,1727 mg/g el flavonoide que se encontró en mayor proporción. A la concentración del 0,1% el extracto de flavonoide presentó el menor índice de peróxido a las 384 horas. Se concluye que los flavonoides presentes en la cascara de naranja tangelo pueden ser utilizados como extractos crudos sin necesidad de purificaciones parciales o totales, para conseguir aumentar la vida útil del aceite sacha inchi
The purpose of this research was to obtain extracts of flavonoids from orange tangelo peelings (Citrus reticulata x Citrus paradisi) and apply them as natural antioxidant to the vegetable oil Sacha inchi (Plukenetia volubilis). The information was obtained from experimental tests which were made in seven steps: physical and chemical characterization of the orange tangelo and the sacha inchi oil; extraction of flavonoids by the Soxhlet extractor; detection of flavonoids in each extract through fine layer chromatography and paper chromatography; identification and quantification of flavonoids by high resolution chromatography liquid (HPLC); determination of the antioxidant capacity of each extract of flavonoid, and finally evaluation of the antioxidant activity in oil sacha inchi, of the extract with the higher level of antioxidant capacity using a multifactorial design with two factors: extracts of flavonoids and concentration at three levels: 0.05%; 0.1% and 0.15%, and 16 blocks which are the times. The results showed that the liquid extract had the greatest quantity of flavonoids: 100.3724 mg/g, being naringine with 81.1727 mg/g, the flavonoid found in greatest proportion. At a concentration of 0.1%, the extract of flavonoid showed the lowest index of peroxide at 384 hours. It is concluded that the flavonoids present in the orange tangelo peeling can be used as raw extracts, without needing partial or total purification, to increase the sacha inchi oil life

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Naranja tangelo - sacha inchi - flavonoide - capacidad antioxidante - actividad antioxidante - Orange tangelo - flavonoid - antioxidant capacity - antioxidant activity

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Efeito do paclobutrazol sobre o crescimento de plantas e produzção de tomate (Solanum lycopersicum L.) em ambiente protegido / Paclobutrazol effect on plant growth and tomato (Solanum lycopersicum L.) production in protected environment
Seleguini, Alexsander;Pradi Vendruscolo, Eduardo;Fernandes Cardoso Campos, ...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2016 7(4):391-399 Please log in to see more details
Objetivou-se estudar, para o híbrido AF 7631 o efeito de três concentrações de paclobu... more
Efeito do paclobutrazol sobre o crescimento de plantas e produzção de tomate (Solanum lycopersicum L.) em ambiente protegido / Paclobutrazol effect on plant growth and tomato (Solanum lycopersicum L.) production in protected environment
Scientia Agropecuaria. October 2016 7(4):391-399
Objetivou-se estudar, para o híbrido AF 7631 o efeito de três concentrações de paclobutrazol (0, 50 e 100 mg ia L-1) e dois métodos de aplicação (embebição de sementes e aplicação em mudas), sobre o desenvolvimento de plantas, produção e qualidade de frutos de tomateiro, em ambiente protegido, no período de primavera/verão. O ensaio foi conduzido, na Fazenda de Ensino, Pesquisa e Extensão da UNESP Ilha Solteira (SP). Os métodos de aplicação e o incremento das concentrações de PBZ não alteraram significativamente a produtividade, entretanto, o tratamento das mudas, via rega, 15 dias após a semeadura, com concentrações crescentes de PBZ induziu a reduções lineares na altura de plantas avaliadas aos 17, 34, 51 e 65 dias após o transplantio (DAT), na taxa de crescimento absoluto da altura no intervalo entre o 17 e 34 DAT, na altura de inserção de primeiro cacho e fitomassa seca de folhas e hastes. Independentemente do método de aplicação de PBZ, o aumento das concentrações reduziu significativamente o vigor das brotações laterais e aumentou a produção de frutos pequenos. As condições climáticas, principalmente, a temperatura, impossibilitaram a expressão do máximo potencial produtivo da cultura
The objective was to study, for hybrid AF 7631, the effect of three concentrations of paclobutrazol (0, 50 and 100 mg ai L-1) and two application methods (soaking seeds and seedlings application) on the development of plants, production and fruit quality of tomato in greenhouse in the spring / summer period. The trial was conducted the Finance Teaching, Research and Extension UNESP Ilha Solteira (SP). Application methods and the increase in PBZ concentrations did not significantly alter the productivity, however, the treatment of seedlings, via irrigation, 15 days after sowing, with increasing concentrations of PBZ induced linear reductions in plant height evaluated at 17, 34, 51 and 65 days after transplanting (DAT) in absolute growth rate of height in the range between 17 and 34 DAT at the time of first cluster of insertion and dry weight of leaves and stems. Regardless of PBZ application method, the concentrations significantly reduced the effect of side shoots and increased production of small fruit. The climatic conditions, especially temperature, prevented the expression of the maximum yield potential of the crop

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Solanum lycopersicum L - produtividade - regulador de crescimento - yield - growth regulators

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Color stability of Bos indicus bull steaks in modified atmosphere packaging (MAP)
dos Santos, Priscila Robertina;Contreras-Castillo, Carmen J;Venturini, Anna...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2016 7(4):401-408 Please log in to see more details
Evaluations of meat quality, including color, influence purchasing decisions and can b... more
Color stability of Bos indicus bull steaks in modified atmosphere packaging (MAP)
Scientia Agropecuaria. October 2016 7(4):401-408
Evaluations of meat quality, including color, influence purchasing decisions and can be affected by type of fresh meat the packaging system. In this study, fresh steaks from Bos indicus bull were packaged in the vacuum (vacuum), 75% O2/25% CO2 (HiOx-MAP) and 40% CO2/0.4% CO/59.6% N2 (CO-MAP). Emphasis is placed on the color and lipid oxidation of bull beef steaks. Results reveal that the steaks stored in CO-MAP and HiOx-MAP exhibited similar or brighter red color than fresh steaks (exposed only to oxygen) or vacuum. The red color of the LD bull beef steaks packaged in CO-MAP was more intense than the color of meat stored in HiOx-MAP after the 14th day of storage. Vacuum packing dramatically impaired the color of the LD bull steaks, which were severely discolored (brown) after all storage times. Bos indicus steaks of all treatments showed extremely low TBARS values in all storage times. The results suggested that HiOx-MAP or CO-MAP may be utilized to stabilize or improve the red color of fresh steaks from bull of so appreciated by the consumer

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - MAP - beef color - carboxymyoglobin - non-castrated males - shelf-life

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SciELO
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