Consulta: subjectFacets:"Stability"
Registros recuperados: 90
Data/hora: 08/06/2024 17:58:14

Aptitud combinatoria y estabilidad de líneas de alto rendimiento derivadas de maíz exótico tropical.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Pérez López, Francisco Javier.
Para generar híbridos de maíz (Zea mays L.) de cruza simple de manera rentable, es necesario que las líneas progenitoras hembras sean de alto rendimiento y que los híbridos generados, así como sus líneas parentales muestren buena estabilidad y adaptación ante los cambios en los ambientes de producción. El objetivo de este trabajo fue estimar la aptitud combinatoria general y aptitud combinatoria específica de 10 líneas de maíz altamente homocigóticas y de alta capacidad de rendimiento, derivadas de poblaciones de maíces exóticos adaptados a condiciones de clima templado, para emplearlas como progenitoras de híbridos de cruza simple; y determinar a través de métodos multivariados (AMMI y SREG) la estabilidad y adaptación de dichas líneas y de sus híbridos...
Palavras-chave: Zea mays L.; Adaptación; Aptitud combinatoria; Alto rendimiento; Estabilidad; Germoplasma exótico; Adaptation; Combinatory ability; High yield; Stability; Exotic germplasm; Genética; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2148

Estimación de parámetros genéticos en cruzas intervarietales de maíz para la región semicálida de Guerrero.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Palemón Alberto, Francisco.
La orografía y agroecología del estado de Guerrero es muy diversa. En las áreas de altitud intermedia (1200 a 1700 m) prácticamente no se siembran con variedades mejoradas de maíz, debido a su limitada adaptación a las condiciones climáticas y edáficas; por lo que, prevalece la siembra de poblaciones nativas. En las áreas semicálidas se ha seleccionado germoplasma subtropical local; paralelamente, en Valles Altos se aplicó selección para adaptación en cuatro poblaciones tropicales durante 10 años. Con estas siete poblaciones progenitoras se generaron 12 cruzas intervarietales (CI) en arreglo factorial, con el propósito de valorar los avances del mejoramiento genético y detectar alguna CI de valor comercial. Las CI, sus progenitores y testigos se evaluaron...
Palavras-chave: Zea mays L.; Variedades tropicales y subtropicales; Aptitud combinatoria general y específica; Heterosis; Estabilidad; Rendimiento de grano; Tropical and subtropical varieties; General and specific combining ability; Stability; Grain yield; Genética; Doctorado.
Ano: 2010
URL: http://hdl.handle.net/10521/284

Fertility Island Formation and Evolution in Dryland Ecosystems
Provedor de dados: Ecology and Society
Autores: Ridolfi, Luca; Politecnico di Torino; luca.ridolfi@polito.it; Laio, Francesco; Politecnico di Torino; francesco.laio@polito.it.
Vast dryland regions around the world are affected by the encroachment of woody vegetation, with important environmental and economical implications. Grassland-to-shrubland conversions are often triggered by disturbance of grassland vegetation, and the consequent formation of barren areas prone to erosion-induced nutrient losses. Inhibition of encroachment by erosion-induced depletion of soil nutrients contributes to the emergence of highly heterogeneous landscapes with shrub-dominated fertility islands surrounded by nutrient-poor bare soil. Here, we develop a process-based simplistic model thataccounts for the two competing processes of resource depletion and shrub encroachment by a non-linear diffusion mechanism. The proposed model is able to generate...
Tipo: Peer-Reviewed Reports
Palavras-chave: Desertification; Islands of fertility; Non-linear diffusion; Stability; Vegetation patterns.
Ano: 2008

Syndromes of Production in Agriculture: Prospects for Social-Ecological Regime Change
Provedor de dados: Ecology and Society
Autores: Vandermeer, John H.; Department of Ecology and Evolutionary Biology, University of Michigan; jvander@umich.edu; Perfecto, Ivette; School of Natural Resources, University of Michigan; perfecto@umich.edu.
Tipo: Peer-Reviewed Insight
Palavras-chave: Agriculture; Production syndromes; Regime change; Stability.
Ano: 2012

Resilience Pivots: Stability and Identity in a Social-Ecological-Cultural System
Provedor de dados: Ecology and Society
Autores: Rotarangi, Stephanie J.; University of Otago;; Stephenson, Janet; University of Otago; janet.stephenson@otago.ac.nz.
Tipo: Peer-Reviewed Reports
Palavras-chave: Cultural resilience; Ecological resilience; Forestry; Identity; New Zealand Maori; Resilience; Social resilience; Stability.
Ano: 2014

THE TOPPLING OF AN IRRIGATION CENTER PIVOT SUBMITTED TO WIND ACTION EFFECTS
Provedor de dados: Engenharia Agrícola
Autores: Schmidt,Edomir M.; Meira Junior,Agenor D. de; Pedrali,Patricia C.; Valdiero,Antonio C.; Thesing,Nelson J.
ABSTRACT This research aims to improve the study about the stability of truss structures used in pivot irrigation, widely used due to the growing demand for food production, when submitted to wind effects. Specifically, it aims to verify the maximum wind speed supported by an irrigation center pivot structure when submitted to the load effects caused by wind gusts perpendicular to the equipment. In order to determine these forces and their effects on the irrigation equipment, computational numerical investigations were carried out using finite element bar models validated by measuring the natural frequency of the equipment in the field. A span was designed based on the existing standards in Brazil and the dynamic response of the structure was examined...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toppling; Stability; Wind; Pivot; Irrigation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000200150

SOIL COMPACTION AND THE STABILITY OF LEVEES OF AQUACULTURE PONDS
Provedor de dados: Engenharia Agrícola
Autores: Magalhães,Esner R. S.; Freitas,Carlos E. de C.; Neves Junior,Afrânio F.; Silva Filho,Francisco C. da.
ABSTRACT The aim of this work was to evaluate the effects of variations in soil compaction on the stability of the slope embankments of fish farms used in aquaculture. Computational modeling was performed using the RocScience Slide 6.0 program, simulating filling scenarios, fast lowering and stationary regimes for the full operation of the fish farms. The data used in these simulations were obtained from soil characterization tests in the laboratory. The geometry of the levees, the inclination of the slopes and the crest width and height, also necessary for modeling, were obtained from field data and technical projects. The modeling generated a safety factor (SF) for the upstream and downstream slopes of the levees, considering different upstream slopes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture; Fish farming; Soils; Levees; Stability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500555

Stabilization of confined beef cattle manure: characteristics of produced fertilizers
Provedor de dados: Engenharia Agrícola
Autores: LORIN,HIGOR E. F.; COSTA,MÔNICA S. S. DE M.; COSTA,LUIZ A. DE M.; PEREIRA,DERCIO C.; CARNEIRO,LEOCIR J.
ABSTRACT The growing demand for animal protein is directly related to the feedlot system of animals and their assumptions, such as the waste management. The characterization of the final products becomes an important factor in decision making by one or by other process. The objective was highlight characteristics that fertilizers present due to the used of stabilization process, by the principal component analysis. For the manure stabilization we realized three aerobic processes, composting, vermicomposting and natural decomposition, and one anaerobic, the anaerobic digestion. These processes produced the compost, the vermicompost, the decomposed manure and the biofertilizer. Fertilizers produced were analyzed by means of seventeen chemical and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizer; Cattle manure; Compost; Vermicompost; Stability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500877

Clonal stability of latex yield in eleven clones of Hevea brasiliensis Muell. Arg.
Provedor de dados: Genetics and Molecular Biology
Autores: Omokhafe,K.O.; Alika,J.E.
Eleven Hevea brasiliensis clones were evaluated for clonal stability of latex yield. A randomized complete block design was used with four replicates, two locations, seven years and three periods per year. Stability analysis was based on clone x year and clone x year x location interactions. Five stability parameters viz environmental variance, shukla's stability variance, regression of clonal latex yield on environmental index, variance due to regression and variance due to deviation from regression were applied. There was significant clone x environment effect at the two levels of interaction. Among the eleven clones, C 162 was outstanding for clonal stability and it can serve as donor parent for stability alleles. Three clones (C 76, C 150 and C 154)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea; Clones; Latex; Stability.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300016

Contributions of weather variables for specific adaptation of rubber tree (Hevea brasiliensis Muell.- Arg) clones
Provedor de dados: Genetics and Molecular Biology
Autores: Priyadarshan,P.M.
The specific adaptation of 15 rubber tree (Hevea brasiliensis) clones was assessed by analyzing yield during a normal year (1997-98) and a year (1998-99) in which the yield was exceptional. Differences in yield in response to changes in weather conditions over the years were evident with clones RRII 203, RRIM 703, PB 5/51 and PB 235 which all exhibited a negative trend with increasing wind velocity during 1997-98, these clones also exhibited a negative correlation with minimum temperature during 1998-99. The prominent yield differences across the years made selection based on both yield and stability inevitable through computing weather variables and environmental index as covariant. To determine the contribution of variable(s) to genotype-environment (GE)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubber clones; Weather variables; Specific adaptation; Hevea; Stability; Environmental index.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400006

A new approach for obtaining rapid uniformity in rice (Oryza sativa L.) via a 3x x 2x cross
Provedor de dados: Genetics and Molecular Biology
Autores: Xing,Shaochen; Cai,Yuhong; Zhou,Kaida.
A triploid (2n = 3x = 36) rice plant was obtained by screening a twin seedling population in which each seed germinated to two or three sprouts that were then crossed with diploid plants. One diploid plant was chosen among the various F1 progenies and developed into an F2 population via self-pollination. Compared with the control variety Shanyou 63, this F2 population had a stable agronomical performance in field trials, as confirmed by the F-test. The stability of the F2 population was further substantiated by molecular analysis with simple sequence repeat markers. Specifically, of 160 markers assayed, 37 (covering all 12 chromosomes) were polymorphic between the parental lines. Testing the F1 hybrid individually with these markers showed that each PCR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: F-test; Polyploidy; Rice; SSR marker; Stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200020

Clonal stability of tree dryness in Hevea brasiliensis Muell. Arg.
Provedor de dados: Genetics and Molecular Biology
Autores: Omokhafe,K.O.
Clonal stability of tree dryness was evaluated in eleven clones of Hevea brasiliensis at the Rubber Research Institute of Nigeria. The experimental design was the randomized complete block with three replicates and ten trees per replicate. The clones were evaluated in three locations. Four stability parameters were applied. The stability parameters were: environmental variance, regression index, variance due to regression, and Shukla's stability variance. Clone C 202 was outstanding for clonal stability and could be useful for further studies and genetic improvement of tree dryness. Other four clones (C 76, C 150, C 159 and RRIM 600) were also stable.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea; Tree dryness; Clones; Stability.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200019

Diversity and stability of fishes (Teleostei) in a temporary river of the Brazilian semiarid region
Provedor de dados: Iheringia Série Zoologia
Autores: Medeiros,Elvio S.F.; Maltchik,Leonardo.
The effects of hydrological disturbances by flooding and drought on the diversity and stability in a temporary river fish community in the Brazilian semiarid region were analyzed over the 1996 hydrological cycle. Twelve collections of fishes were made during the wet and dry phases, and 789 individuals of 16 species were collected. Diversity was measured using Simpson's Index (S) and community stability was analyzed by the variation in abundance using Kendall's W concordance test. Fish diversity in the Taperoá river was subjected to hydrological disturbances by flooding and drought. During the wet phase the diversity was higher (S = 0.855) than during the dry phase (S = 0.771). The community was considered stable during the whole annual hydrological cycle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Intermittent stream; Disturbance; Diversity; Stability.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212001000100016

Análise da estabilidade do rendimento em cultivares de caupi (Vigna unguiculata (L.) Walp.) na região amazônica.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: OLIVEIRA, A. F. F. de; BARRIGA, R. H. M. P.; PEREIRA, I. C. M.
bitstream/item/31908/1/CPATU-BP37.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Caupi; Estabilidade; Maranhao; Pará; Amapa; Brasil; Cowpea; Stability; Variety; Revenue.; Rendimento; Variedade; Vigna Unguiculata.; Amazonia.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/382453

Stability of some stationary solutions to the forced KdV equation with one or two bumps
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chardard, Frederic; Dias, Frederic; Nguyen, Hai Yen; Vanden-broeck, Jean-marc.
Free-surface flows past submerged obstacles in a channel are considered. The fluid is assumed to be inviscid and incompressible and the flow to be irrotational. The first-order approximation of long nonlinear surface waves over one or two bumps results in a forced Korteweg-de Vries (fKdV) equation. Solutions of the stationary fKdV equation are constructed and their stability is studied, either analytically or numerically. These various solutions include solitary waves over a single bump, solitary waves with two humps over a double bump, table-top solutions over a double bump and fronts.
Tipo: Text
Palavras-chave: Forced Korteweg-de Vries equation; Free-surface flows; Numerical simulations; Stability; Topography.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00037/14873/12348.pdf

Modèles autorégressifs à changements de régimes markoviens. Applications aux séries tempo-relles de vent
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ailliot, Pierre.
In this thesis, several original Markov switching autoregressive model are proposed for wind time series. The first chapter is devoted to a theoretical study of these models. We focus mainly on the problems of the numerical calculation of the maximum likelihood estimators, of the asymp-totic behavior of these estimators and finally of model selection and validation. In the second chapter, we propose various Markov switching autoregressive model to describe the evolution of the wind in a fixed point, and then in the third chapter its space-time evolution. For each suggested model, we check the physical interpretability of the various parameters, and their capacity to simulate realistic artificial sequences. The obtained results are compared to those...
Tipo: Text
Palavras-chave: Space time model; Wind time series; Asymptotic properties; Maximum likelihood estimator; Stability; Markov Switching autoregressive model; Modèle spatio temporel; Séries temporelles de vent; Propriétés asymptotiques; Estimateurs du maximum de vraisemblance; Stabilité; Modèles autorégressifs à changements de régimes markoviens.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/these-325.pdf

The relative importance of environmental stochasticity, interspecific interactions, and observation error: Insights from sardine and anchovy landings
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hosack, Geoffrey R.; Trenkel, Verena; Dambacher, Jeffrey M.
Long-term time series of sardine and anchovy landings often suggest negative dependence between these species, and an array of mechanisms have been proposed as explanations. We reduce these propositions to four basic hypotheses of (1) independence, (2) correlated process noise, (3) interspecific interactions, and (4) correlated observational error. We use a Bayesian approach to develop priors for parsimonious state space models with both process noise and observation error that represent each of these hypotheses, and apply this approach to five long-term time series of landings collected from the Pacific and Atlantic Oceans. Model comparison criteria suggest that the hypothesis of correlated process noise has the broadest support, where the temporal...
Tipo: Text
Palavras-chave: Adaptive Metropolis; Bayes factors; DIC; Gompertz model; Hyperstability; Kalman filter; Model comparison; Reactivity; Small pelagic fishes; Stability.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00159/27072/26066.pdf

Hydrate dissolution as a potential mechanism for pockmark formation in the Niger delta
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sultan, Nabil; Marsset, Bruno; Ker, Stephan; Marsset, Tania; Voisset, Michel; Vernant, Antoine-mathieu; Bayon, Germain; Cauquil, Eric; Adamy, J.; Colliat, J. L.; Drapeau, D.
Based on acquired geophysical, geological and geotechnical data and modeling, we suggest hydrate dissolution to cause sediment collapse and pockmark formation in the Niger delta. Very high-resolution bathymetry data acquired from the Niger delta reveal the morphology of pockmarks with different shapes and sizes going from a small ring depression surrounding an irregular floor to more typical pockmarks with uniform depression. Geophysical data, in situ piezocone measurements, piezometer measurements and sediment cores demonstrate the presence of a common internal architecture of the studied pockmarks: inner sediments rich in gas hydrates surrounded by overpressured sediments. The temperature, pressure and salinity conditions of the studied area have allowed...
Tipo: Text
Palavras-chave: Methane gas hydrate; Sea floor; Marine sediments; Pore pressure; Porous media; Continental margin; Clathrate hydrate; Fluid flow; Stability; Slope.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00012/12300/9092.pdf

Environment outweighs the effects of fishing in regulating demersal community structure in an exploited marine ecosystem
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mérillet, Laurene; Kopp, Dorothee; Robert, Marianne; Mouchet, Maud; Pavoine, Sandrine.
Global climate change has already caused bottom temperatures of coastal marine ecosystems to increase worldwide. These ecosystems face many pressures, of which fishing is one of the most important. While consequences of global warming on commercial species are studied extensively, the importance of the increase in bottom temperature and of variation in fishing effort is more rarely considered together in these exploited ecosystems. Using a 17‐year time series from an international bottom‐trawl survey, we investigated co‐variations of an entire demersal ecosystem (101 taxa) with the environment in the Celtic Sea. Our results showed that over the past two decades, biotic communities in the Celtic Sea were likely controlled more by environmental variables...
Tipo: Text
Palavras-chave: Bottom trawl survey; Celtic Sea; Fishing effort; Marine resources; Spatio-temporal dynamics; Stability; STATICO multivariate analysis.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71150/69470.pdf

Rotavirus VLP2/6: a new tool for tracking rotavirus in the marine environment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Loisy, Fabienne; Atmar, Robert L.; Cohen, Jean; Bosch, Albert; Le Guyader, Soizick.
The potential of rotavirus 2/6-virus-like-particles (VLP2/6) for use as tracers in the marine environment was investigated. The stability of bovine rotavirus (strain RF) and VLP2/6 in natural seawater at 25degreesC for six days was studied. ELISA and western blot methods were used to quantify the particles. The rates of decline of rotavirus particles and VLP2/6 were similar (approximately 0.5 log 10 per day). Western blot analysis showed that the integrity of capsid proteins VP2 and VP6 was conserved during the incubation time. These results demonstrate that VLP2/6 particles have the same stability in seawater as rotavirus particles. Thus, VLP2/6 can be used as a tracer, which should be of particular value for studying the fate of rotavirus particles in...
Tipo: Text
Palavras-chave: Stability; Tracer; Seawater; Virus like particles; Rotavirus.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/2004/publication-330.pdf

Stability of spatial structures of demersal assemblages: a multitable approach
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gaertner, Jean-claude; Chessel, Daniel; Bertrand, Jacques.
The present work is based on a set of bottom trawl surveys performed in the Gulf of Lions between 1983 and 1992. A new method which couples the STATIS multitable approach with the logic of correspondence analysis (CoA) is proposed to study the stability of spatial organization of demersal assemblages in terms of species composition. This CoA version of STATIS has provided a clear representation of the stable part of the spatial structure of the assemblages. In addition, it gave an insight into the interannual variations of the distribution of each population around the reference structure. Our results showed that the demersal assemblages of the Gulf of Lions exhibited strong spatial structuring, mainly orientated along a bathymetric gradient. This gradient...
Tipo: Text
Palavras-chave: Assemblage de poissons; Chalutage; Analyse multitableaux; Méditerranée; Stabilité; Structure spatiale; Fish assemblage; Trawl surveys; Multitable analysis; Correspondence analysis; Mediterranean sea; Stability; Spatial structure.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-875.pdf

Stability of the relationships among demersal fish assemblages and environmental-trawling drivers at large spatio-temporal scales in the northern Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mérigot, Bastien; Gaertner, Jean-claude; Brind’amour, Anik; Carbonara, Pierluigi; Esteban, Antonio; Garcia-ruiz, Cristina; Gristina, Michele; Imzilen, Taha; Jadaud, Angelique; Joksimovic, Aleksandar; Kavadas, Stefanos; Kolitari, Jerina; Maina, Irida; Maiorano, Porzia; Manfredi, Chiara; Micallef, Reno; Peristeraki, Panagiota; Relini, Giulio; Sbrana, Mario; Spedicato, Maria Teresa; Thasitis, Ioannis; Vittori, Stefania; Vrgoc, Nedo.
Trawling pressure and environmental changes may affect the composition of fish assemblages. Our knowledge on large spatio-temporal patterns of demersal fish composition remains incomplete for the Mediterranean Sea. We investigated (1) the spatio-temporal stability of demersal assemblages, (2) the relationships between these assemblages and potential structuring factors (trawling pressure and environmental conditions) in order to assess the dynamic of the assemblage structure at the scale of the northern Mediterranean Sea. We analysed a dataset of 18062 hauls from 10 to 800 m depth performed annually during the last two decades across 17 Geographical Sub-Areas (GSAs) (MEDITS program). A multi-table analysis (STATICO-CoA) evidenced a strong inter-GSAs...
Tipo: Text
Palavras-chave: Species composition; Stability; Demersal assemblages; Environment; Fishing pressure; Large scale; Co-inertia analysis; STATICO-CoA.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00584/69629/67485.pdf

Diversity and stability of an estuarine trophic network
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lobry, Jeremy; David, V; Pasquaud, S; Lepage, M; Sautour, B; Rochard, E.
Estuarine areas provide highly valuable ecosystem benefits for human populations, despite being under intense demographic, economic and ecological pressures. Hence, an understanding of the structure and function of estuarine ecosystems is essential for understanding the persistence and stability of these ecosystems and their response to perturbations. This study synthesises available data and knowledge about the Gironde estuary (SW France) in a mass-balanced trophic model to illustrate potential key patterns in the functioning of the estuarine ecosystem and key elements of its stability. In order to evaluate the total direct and indirect impact on the whole community of the 2 main sources of anthropogenic perturbations in the estuarine area, mortalities...
Tipo: Text
Palavras-chave: Gironde estuary; Ecopath; Diversity; Stability; Network analysis; Food web; Estuarine ecosystem.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4290.pdf

Individuals exhibit consistent differences in their metabolic rates across changing thermal conditions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Auer, Sonya K.; Salin, Karine; Anderson, Graeme J.; Metcalfe, Neil B.
Metabolic rate has been linked to growth, reproduction, and survival at the individual level and is thought to have far reaching consequences for the ecology and evolution of organisms. However, differences in metabolic rate among individuals must be consistent (i.e. repeatable) over at least some portion of their lifetime in order to predict their longer-term effects on population dynamics and how they will respond to selection. Previous studies demonstrate that metabolic rates are repeatable under constant conditions but potentially less so in more variable environments. We measured the standard (= minimum) metabolic rate, maximum metabolic rate, and aerobic scope (= interval between standard and maximum rates) in juvenile brown trout (Salmo trutta)...
Tipo: Text
Palavras-chave: Aerobic scope; Consistency; Maximum metabolic rate; Standard metabolic rate; Stability; Thermal repeatability.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00414/52585/53425.pdf

Influence of stability and fragmentation of a worm-reef on benthic macrofauna
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Godet, Laurent; Fournier, Jerome; Jaffre, Mikael; Desroy, Nicolas.
In coastal areas, reef-builder worms often are bio-engineers by structuring their physical and biological environment. Many studies showed that this engineering role is determined by the densities of the engineer species itself, the highest densities approximately corresponding to the most stable areas from a sedimentological point of view, and hosting the richest and the most diverse benthic fauna. Here, we tested the potential influence of the spatio-temporal dynamics and the spatial fragmentation of one of the largest European intertidal reefs generated by the marine worm Lanice conchilega (Pallas, 1766) (Annelida, Polychaeta) on the associated benthic macrofauna. We demonstrated that the worm densities do have a significant positive role on the...
Tipo: Text
Palavras-chave: Reefs; Zoobenthos; Stability; Fragmentation; Tidal flats; Bay of the Mont-Saint-Michel.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00044/15560/12973.pdf

Spatio-temporal organization patterns of demersal assemblages of the east coast of Corsica (Mediterranean Sea)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gaertner, Jean-claude; Bertrand, Jacques; Samani, D; Souplet, Arnauld.
The paper deals with the spatio-temporal organization patterns demersal assemblages along the east coast of Corsica. We analysed data collected by the first standardized experimental bottom trawl surveys performed in this region from 1994 to 1999 (MEDITS programme). The use of a multiway table method (STATIS-CoA) showed that the spatial organization pattern of the demersal assemblages of eastern Corsica was highly stable during the period studied. This pattern was structured around three bathymetric areas (i) the continental shelf (between 50 to 200 m depth), (ii) the upper slope (from 200 to 500 m) and (iii) the deeper slope (from 500 to 800 m), but it did not show any heterogeneity in relation with latitude. Along the cast coast of Corsica-characterized...
Tipo: Text
Palavras-chave: Corsica; Mediterranean Sea; Stability; Multiway table analysis; Trawl surveys; Fish assemblages; Spatial structures.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-692.pdf

What is the optimum concentration of m-cresol in antivenoms?
Provedor de dados: Journal of Venomous Animals and Toxins Including Tropical Diseases
Autores: Abd-Elsalam,MA; Abdoon,N; Al-Ahaidib,MS.
Antivenoms against snake and scorpion envenomations are usually equine in nature and composed mostly of F(ab')2; additionally, phenol and m-cresol are mainly employed for their preservation. Although there is no study on this subject, m-cresol is utilized by most manufacturers in a concentration that ranges from 0.15 to 0.35 g%. Decreasing the concentration of m-cresol to its minimal effective level may protect victims from its toxic effects and keep the antivenom stable during its shelf life without forming any aggregates. In the present work, different concentrations of m-cresol, ranging from 0.1 to 0.35 g%, were used with some selected batches of snake and scorpion antivenoms. A low concentration of 0.15 g% showed an acceptable preserving result that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antivenoms; Preservative; M-cresol; Stability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992011000100003

Comparative characterization of digestive proteases in redhead cichlid (Vieja melanurus) and twoband cichlid (Vieja bifasciata) (Percoidei: Cichlidae)
Provedor de dados: Neotropical Ichthyology
Autores: Frías-Quintana,Carlos Alfonso; Peña-Marín,Emyr Saul; Ramírez-Custodio,Carlos David; Martínez-García,Rafael; Jiménez-Martínez,Luis Daniel; Camarillo-Coop,Susana; Guerrero-Zárate,Rocío; Asencio-Alcudia,Gloria Gertrudys; Álvarez-González,Carlos Alfonso.
ABSTRACT In the Southeast of Mexico, there are many native cichlids with commercial interest such as redhead cichlid (Vieja melanurus) and twoband cichlid (V. bifasciata), which have a great local demand and excellent meat quality. However, it is necessary to implement their culture based on nutrition studies and digestive biochemistry. This study’s objective was to characterize these two cichlids’ digestive proteases (pH, temperature, and inhibitors) through biochemistry techniques. Results showed that V. melanurus and V. bifasciata have a digestive capacity analogous to other omnivore fishes, where the optimal pH values of stomach proteases (4 and 2, respectively) and intestinal proteases (6 and 12, respectively), the optimal temperature of acid (35°C...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inhibitors; PH; Proteases; Stability; Temperature.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100210

Cambios en los compuestos volátiles de un concentrado de sabor limón por la presencia de ácido cítrico
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Pino, J. A.; Sauri-Duch, E.; Cuevas-Glory, L.
En el presente trabajo se estudiaron los cambios de los componentes volátiles de un concentrado de sabor limón para preparar bebidas de limón durante 6 meses de conservación a 40 ºC. Se identificaron 44 compuestos aislados mediante microextracción en fase sólida del espacio de cabeza en combinación con la cromatografía de gases- espectrometría de masas. El limoneno, γ-terpineno, acetato de citronelilo, acetato de nerilo y acetato de geranilo, disminuyeron su contenido significativamente, mientras que el 1,4-cineol, 1,8-cineol, p-cimeno, p-cimeneno, p-menta-1,3- dien-8-ol, α-terpineol,  trans-α-bergamoteno, ar-curcumeno, (E,E)-α-farneseno y β-bisaboleno la incrementaron. El neral y geranial parecen disminuir su contenido, pero estos cambios no explican todo...
Tipo: Journal Contribution
Palavras-chave: Volatile compounds; Stability; Flavourings; Concentrates; Lemons; Spoilage; Citric acid.
Ano: 2008
URL: http://hdl.handle.net/1834/4893

Genotype by environment interaction for seed yield per plant in rapeseed using AMMI model
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Marjanović-Jeromela,Ana; Nagl,Nevena; Gvozdanović-Varga,Jelica; Hristov,Nikola; Kondić-Špika,Ankica; Marinković,Mirjana Vasićand Radovan.
The objective of this study was to assess genotype by environment interaction for seed yield per plant in rapeseed cultivars grown in Northern Serbia by the AMMI (additive main effects and multiplicative interaction) model. The study comprised 19 rapeseed genotypes, analyzed in seven years through field trials arranged in a randomized complete block design, with three replicates. Seed yield per plant of the tested cultivars varied from 1.82 to 19.47 g throughout the seven seasons, with an average of 7.41 g. In the variance analysis, 72.49% of the total yield variation was explained by environment, 7.71% by differences between genotypes, and 19.09% by genotype by environment interaction. On the biplot, cultivars with high yield genetic potential had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica napus; Adaptability; Biplot; Stability; Yield component.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000200009

Multivariate analyses of genotype x environment interaction of popcorn
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Miranda,Glauco Vieira; Souza,Leandro Vagno de; Guimarães,Lauro José Moreira; Namorato,Heraldo; Oliveira,Lucimar Rodrigues; Soares,Marcelo Oliveira.
The objectives of this work were to evaluate the genotype x environment (GxE) interaction for popcorn and to compare two multivariate analyses methods. Nine popcorn cultivars were sown on four dates one month apart during each of the agricultural years 1998/1999 and 1999/2000. The experiments were carried out using randomized block designs, with four replicates. The cv. Zélia contributed the least to the GxE interaction. The cv. Viçosa performed similarly to cv. Rosa-claro. Optimization of GxE was obtained for cv. CMS 42 for a favorable mega-environment, and for cv. CMS 43 for an unfavorable environment. Multivariate analysis supported the results from the method of Eberhart &amp;amp; Russell. The graphic analysis of the Additive Main effects and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Adaptability; Breeding; Maize; Popcorn; Selection; Stability.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000100007

Statistical models for evaluating the genotype-environment interaction in maize (Zea mays L.)
Provedor de dados: Phyton: Revista Internacional de Botánica Experimental
Autores: Kandus,M; Almorza,D; Boggio Ronceros,R; Salerno,JC.
Our objective was to determine the genotype-environment interaction (GxE) in a hybrid integrated by maize lines either carrying or not balanced lethal systems. Experiments were conducted in three locations over a period of two years considering each year-location combination as a different environment. Yield data were analysed using the Additive Main Effects and Multiplicative Interaction (AMMI) model and the Sites Regression Analysis (SREG). Results were represented by biplots. The AMMI analysis was the best model for determining the interaction.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptability; Multivariate analysis; Plant breeding; Stability.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100007

Multiple Membership and Federal Sructures
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Le Breton,   Michel; Makarov,   Valery; Savvateev,   Alexei; Weber,   Shlomo.
We consider a model of the “world" with several regions that may create a  unified entity or be partitioned into several unions (countries). The regions have distinct preferences over policies chosen in the country to which they belong and equally share the cost of public policies. It is known that stable \political maps" or country partitions, that do not admit a threat of secession by any group of regions, may fail to exist. To rectify this problem, in line with the recent trend for an increased autonomy and various regional arrangements, we consider federal structures, where a region can simultaneously be a part of several unions. We show that, under very general conditions, there always exists a stable federal structure.
Tipo: Working or Discussion Paper
Palavras-chave: Partitions; Federal Structures; Stability; Cooperative Games; C71; D71; H41.
Ano: 2008
URL: http://purl.umn.edu/37519

A MEZŐGAZDASÁGI JÖVEDELMEK STABILITÁSA
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Lamfalusi,   Ibolya.
A mezőgazdasági jövedelmek stabilitásának megteremtése mindenkor az ag-rárpolitika fontos törekvése. A mezőgazdaságból élőknek a termelői jövedelem nagysága és alakulása meghatározza a gazdálkodói életszínvonal minőségét. Az EU országok jövedelemstabilitási mutatóival összevetve a magyar mezőgazda-ságét meg¬állapítható, hogy a hazai gazdálkodók helyzete igen kedvezőtlen. Az ágazatban mind a nominális értéken vett jövedelem stabilitása, mind pedig a jövedelem re¬ál¬értéke kedvezőtlenül alakult. A reáljövedelem 1998 és 2005 között egyetlen évben sem érte el az 1998. évi 80%-át, sőt 2003-ban 50%-nál kevesebb volt.  A mezőgazdasági termelés jövedelemstabilitását a mezőgazdasági kibocsátás kiegyensúlyozottsága határozza meg alapvetően. A kibocsátás már magában...
Tipo: Journal Article
Palavras-chave: Jövedelem; Stabilitás; Instabilitás; EU; Mezőgazdaság; Income; Stability; Instability; EU; Rural economy; Agricultural and Food Policy; Community/Rural/Urban Development; Production Economics.
Ano: 2007
URL: http://purl.umn.edu/57674

Status-Seeking in Hedonic Games with Heterogeneous Players
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Lazarova,   Emiliya A.; Dimitrov,   Dinko.
We study hedonic games with heterogeneous player types that reflect her nationality, ethnic background, or skill type. Agents' preferences are dictated by status-seeking where status can be either local or global. The two dimensions of status define the two components of a generalized constant elasticity of substitution utility function. In this setting, we characterize the core as a function of the utility's parameter values and show that in all cases the corresponding cores are non-empty. We further discuss the core stable outcomes in terms of their segregating versus integrating properties.
Tipo: Working or Discussion Paper
Palavras-chave: Coalitions; Core; Stability; Status-seeking; Environmental Economics and Policy; C78; J41; D71.
Ano: 2010
URL: http://purl.umn.edu/96838

Constrained School Choice: An Experimental Study
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Calsamiglia,   Caterina; Haeringer,   Guillaume; Klijn,   Flip.
The literature on school choice assumes that families can submit a preference list over all the schools they want to be assigned to. However, in many real-life instances families are only allowed to submit a list containing a limited number of schools. Subjects' incentives are drastically affected, as more individuals manipulate their preferentes. Including a safety school in the constrained list explains most manipulations. Competitiveness across schools plays an important role. Constraining choices increases segregation and affects the stability and efficiency of the final allocation. Remarkably, the constraint reduces significantly the proportion of subjects playing a dominated strategy.
Tipo: Working or Discussion Paper
Palavras-chave: School Choice; Matching; Experiment; Gale-Shapley; Top Trading Cycles; Boston Mechanism; Efficiency; Stability; Truncation; Truthtelling; Safety School; Institutional and Behavioral Economics; C72; C78; D78; I20.
Ano: 2009
URL: http://purl.umn.edu/50480

Connections Among Farsighted Agents
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Grandjean,   Gilles; Mauleon,   Ana; Vannetelbosch,   Vincent.
We study the stability of social and economic networks when players are farsighted. In particular, we examine whether the networks formed by farsighted players are different from those formed by myopic players. We adopt Herings, Mauleon and Vannetelbosch’s (Games and Economic Behavior, forthcoming) notion of pairwise farsightedly stable set. We first investigate in some classical models of social and economic networks whether the pairwise farsightedly stable sets of networks coincide with the set of pairwise (myopically) stable networks and the set of strongly efficient networks. We then provide some primitive conditions on value functions and allocation rules so that the set of strongly efficient networks is the unique pairwise farsightedly stable set....
Tipo: Working or Discussion Paper
Palavras-chave: Farsighted Players; Stability; Efficiency; Connections Model; Buyerseller Networks; Institutional and Behavioral Economics; A14; C70; D20.
Ano: 2009
URL: http://purl.umn.edu/50482

Many-to-One Matching when Colleagues Matter
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Revilla,   Pablo.
This paper studies many-to-one matching market in which each agent’s preferences not only depend on the institution that hires her, but also on the group of her colleagues, which are matched  to the same institution. With an unrestricted  domain of preferences  the non-emptiness of the core is not guaranteed. Under certain conditions on agents’ preferences, we show that two possible situations in which, at least, one stable allocation exists, emerge. The first condition, called Group Togetherness, reflects real-life situations in which agents are more concerned about an acceptable set of colleagues than about the firm hiring them. The second one, Common Best Colleague, refers to markets in which a workers’ ranking is accepted by workers and firms present...
Tipo: Working or Discussion Paper
Palavras-chave: Many-to-one matching; Hedonic; Coalitions; Stability; Colleagues; Marketing; C78; D71.
Ano: 2007
URL: http://purl.umn.edu/7443

The Stability of Exchange Networks
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Dooan,   Gonul; van Assen,   M.A.L.M.; van de Rijt,   Arnout; Buskens,   Vincent.
This paper develops a formal model of exchange network stability that combines expected value theory (Friedkin 1995) with the economic literature on network dynamics. We identify stable networks up to size 8 for varying costs and investigate whether they are Pareto efficient and egalitarian. Only a very small number of networks are stable. Odd cycles and networks consisting of dyads and at most one isolate are the only egalitarian, efficient, and stable networks for a large cost range. We show that some of these results are generalizable to networks of any size and are independent of using expected value theory.
Tipo: Working or Discussion Paper
Palavras-chave: Exchange Networks; Stability; Efficiency; Equity; Social Dilemma; Institutional and Behavioral Economics; International Development; D85.
Ano: 2007
URL: http://purl.umn.edu/9098

Under-connected and Over-connected Networks
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Buechel,   Berno; Hellmann,   Tim.
Since the seminal contribution of Jackson &amp; Wolinsky 1996 [A Strategic Model of Social and Economic Networks, JET 71, 44-74] it has been widely acknowledged that the formation of social networks exhibits a general conflict between individual strategic behavior and collective outcome. What has not been studied systematically are the sources of inefficiency. We approach this omission by analyzing the role of positive and negative externalities of link formation. This yields general results that relate situations of positive externalities with stable networks that cannot be “too dense” in a well-defined sense, while situations with negative externalities tend to induce “too dense” networks.
Tipo: Working or Discussion Paper
Palavras-chave: Networks; Network Formation; Connections; Game Theory; Externalities; Spillovers; Stability; Efficiency; Institutional and Behavioral Economics; D85; C72; L14.
Ano: 2009
URL: http://purl.umn.edu/50728

Coalitional Matchings
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Dimitrov,   Dinko; Lazarova,   Emiliya A.
A coalitional matching is a two-sided matching problem in which agents on each side of the market may form coalitions such as student groups and research teams who - when matched - form universities. We assume that each researcher has preferences over the research teams he would like to work in and over the student groups he would like to teach to. Correspondingly, each student has preferences over the groups of students he wants to study with and over the teams of researchers he would like to learn from. In this setup, we examine how the existence of core stable partitions on the distinct market sides, the restriction of agents’ preferences over groups to strict orderings, and the extent to which individual preferences respect common rankings shape the...
Tipo: Working or Discussion Paper
Palavras-chave: Coalitions; Common Rankings; Core; Stability; Totally Balanced Games; Two-Sided Matchings; C78; J41; D71.
Ano: 2008
URL: http://purl.umn.edu/37523

Why the dimension matters in ecological models?
Provedor de dados: Revista Chilena de Historia Natural
Autores: Ramos-Jiliberto,Rodrigo; Hoecker-Escuti,Francisco; Mena-Lorca,Jaime.
In this work we discuss the ecological and mathematical significance of system's dimension in continuous-time population dynamics models. We show how the system's dimension reflects the ecological assumptions and affects both the spectrum of dynamic output and mathematical tractability of the models. We stress that the model dimension is not always the same as the number of state-variables, and we also present conditions under which the system's dimension is altered
Tipo: Journal article
Palavras-chave: ODE; Population dynamics; Theoretical models; Mathematical ecology; Stability.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400012

Effect of food additives on the antioxidant properties and microbiological quality of red guava juice
Provedor de dados: Revista Ciência Agronômica (RCA)
Autores: Silva,Natalia Kellen Vieira da; Sabino,Luiz Bruno de Sousa; Oliveira,Luciana Siqueira de; Torres,Lucicléia Barros de Vasconcelos; Sousa,Paulo Henrique Machado de.
ABSTRACT Guava is a tropical fruit that has a high potential for agroindustrial use, also known antioxidant property mainly attributed to vitamin C and carotenoids content. The objective of this study was to evaluate the influence of food preservatives, individually or combined, on the antioxidant properties of red guava nectar during storage. Nectars added of different additives were stored in the dark for 180 days and evaluated at the processing day and every 90 days for physico-chemical parameters, color, bioactive compounds content, total antioxidant activity (TAA), the microbiologica and sensory quality. Was not observed changes in quality parameters (P&gt;0.05), since the guava nectars were presented in accordance with Standards of Identity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Chemical additives; Bioactive compounds; Stability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100077

Powdered beverage mix with acerola pulp, whey and maltodextrin
Provedor de dados: Revista Ciência Agronômica (RCA)
Autores: Lima,Natalia Duarte de; Afonso,Marcos Rodrigues Amorim; Costa,José Maria Correia da; Carvalho,Juliane Doering Gasparin.
ABSTRACT Mixing acerola pulp with whey, a by-product of the dairy industry, led to this study, whose aim was the development of a powdered beverage mix of acerola pulp, whey and maltodextrin (DE20). To determine the proportions of the mixture, a simplex-centroid mixture design was used. Different proportions of the mixture were dehydrated in a spray dryer at 175 °C. The results were evaluated in relation to hygroscopicity, moisture and ascorbic acid. Higher proportions of whey and pulp increased hygroscopicity and moisture, while maltodextrin reduced these parameters. An increase in pulp content raised the levels of ascorbic acid. The proportions (m m-1) of 50% acerola pulp, 25% whey and 25% maltodextrin resulted in significantly lower hygroscopicity (8.25...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spray dryer; Mixture design; Stability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400578

EVALUATION OFRhizophora mangle BARK COMING FROM THE WESTERN AREA OF CUBA FOR BIOMEDICAL DESTINATION
Provedor de dados: Revista de Salud Animal
Autores: Escobar,A; Fragas,Ivis; Sánchez,Luz M; Pérez,Tania; Riverón,Yamilka; Marrero,Evangelina.
Cuban mangroves constitute the 5% of the country surface and they are distributed in the whole coast of the island. One of the species represented is Rhizophora mangle L. (red mangrove). From the bark of this plant, new drugs for human and veterinary use have been obtained. All the areas studied in the western region showed values of soluble substances (&gt;14.5 mg/ml); ash (&lt; 12%); total tannins (&gt;6 mg/ml) and percentage of polymerized polyphenolic compounds (PPC) (&gt;90%). Rhizophora mangle bark can be collected in every season. It is stable for more than one year when being stored in polyethylene sacks in a fresh place at room temperature (25 ± 5°C) with a relative humidity between 70-90%.
Tipo: Journal article
Palavras-chave: Rhizophora mangle L; Red mangrove; CIKRON; Stability.
Ano: 2007
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S0253-570X2007000100009

Effect of pH on the copigmentation of anthocyanins from Cabernet Sauvignon grape extracts with organic acids
Provedor de dados: Scientia Agricola
Autores: Gauche,Cony; Malagoli,Elisa da Silva; Bordignon Luiz,Marilde Terezinha.
Anthocyanins show low-stability when exposed to different food processing conditions. Copigmentation is one of the main reactions contributing to the in vivo color responsible to the stability of anthocyanins. In the aim of holding the red color, copigmentation effect of organic acids (caffeic, ferulic, gallic and tannic acids) combined with anthocyanins in crude Cabernet Sauvignon (Vitis vinifera L.) grape skin extract at pH values (1.0, 2.0, 3.0, 3.3, 3.5, 3.7, 4.0, 4.5) was evaluated in this research. The maximum copigmentation effect, revealed by the hyperchromic and bathochromic shifts in anthocyanin maximum absorbance wavelength, was obtained at pH 3.3 with every acid used. Anthocyanin stability was followed by measuring the loss of color, thus it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stability; Pigment; Color retention; Half-life time.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100006

Common bean cultivars and lines interactions with environments
Provedor de dados: Scientia Agricola
Autores: Carbonell,Sérgio Augusto Morais; Azevedo Filho,Joaquim Adelino de; Dias,Luiz Antônio dos Santos; Garcia,Antonio Augusto Franco; Morais,Lizz Kezzy de.
The performance of bean lines brought forth in breeding programs or of cultivars in use can be affected by environmental variability. The adaptability and stability of grain yield of 18 common bean cultivars and lines in 23 environments (combinations of seasons, years and locations) were evaluated in the State of São Paulo, Brazil. 'IAC-Carioca' and 'IAC-Carioca Eté' were used as standard cultivars for the carioca grain type, while 'FT-Nobre' and 'IAC-Una' represented the standard for black grains. The experiment was set up in a randomized complete block design with four replications and plots consisting of two, two central five meters rows flanked by border rows. Stability parameters were estimated by the methods Maximum Yield Deviations (MYD) and by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; AMMI; Adaptability; Stability; Cultivar.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200008

Corn regional yield trial
Provedor de dados: Thai Agricultural Research Repository
Autores: Prakob Jan-Aram; Wiwak Butaku; Sukapong Vayuparp; Preecha Saengsoda; Reantong Pansaita; Wanit Chomklin; Kritchai Jaiserb; Sujin Vabanlan; Pranom Kaewbutrdee; Sakol Petchmanee.
13 tables
Palavras-chave: Corn; Maize; Regional yield trial; Stability; Adaptability; ข้าวโพด; การทดสอบพันธุ์; ผลผลิต; ความคงตัว; การปรับตัว.
Ano: 1985
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4586

Genotype x envíronment ínteractíon for yield of rice hybrids and ínbred varíetíes ín Venezuela
Provedor de dados: Acta Agronómica
Autores: Acevedo Barona,Marco Antonio; Silva Díaz,Rubén José; Perdomo Rojas,Rosaura Desirée; Pérez Almeida,Iris Betzaida; Álvarez Parra,Rosa María; Torres Angarita,Orlando José.
Abstract Performance tests in múltiple locations are essential to study the genotype x-environment interaction, as well as to identify superior genotypes and testing locations. The objective of this study was to evaluate the adaptability and stability of rice hybrids and inbred varieties for grain yield. Six experiments were conducted in rice-producing areas of Venezuela using a randomized complete block design during the dry season of 2015 2016. The ANOVA detected significant differences for genotype, location, and genotype-by-location interaction, highlighting the hybrid by location interaction. The Lin and Binns model identified the hybrids ‘RHA-180' and ‘HL23035H' and the ‘Soberana Fl' variety as adapted and stable. In the GGE biplot model, the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptability; GGE biplot; Lin-Binns; Stability; Oryza sativa L.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000100073

Lipid profile and oxidative stability of beef cuts from Urabá (Antioquia, Colombia): A step towards global commercialization
Provedor de dados: Acta Agronómica
Autores: Restrepo-Molina,Diego Alonso; Álvarez-Henao,María Victoria; Rojano,Benjamín; Alzate-Arbeláez,Andrés Felipe; Duarte-Correa,Yudy.
Abstract The commercialization of beef is an activity of great relevance for the department of Antioquia (Colombia), particularly in the Urabá region. The objective of this study was to evaluate the fat content, lipid composition, and some indicators of lipid oxidation and protein in beef from the Urabá region. 72 samples of beef cuts (loin and neck) of categories 3, 4 and 5 stars were analyzed. There were no statistical differences (p &gt; 0.05) between the fat content of cuts from the neck (11.64 ± 7.25 %) and loin (10.49 ± 5.60 %), or in the amount of saturated, monounsaturated, and polyunsaturated fat. There was no difference between the samples evaluated for lipid oxidation (TBARS). The lowest protein oxidation (4.48 ± 0.21 nmol carbonyl compounds/mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipid content; Oxidation; Stability; Meat; Fat.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000300240

Soil moisture retention and mass movement of volcanic soils from the "Sabinas" sector in Caldas, Colombia
Provedor de dados: Acta Agronómica
Autores: Chavarriaga Montoya,William; Cruz Cerón,Gabriel; Cuervo Correa,Johan.
Abstract The mass movement of soils, are soil, rocks displacements or both, caused by soil water excesses in terrains due to gravity effects and other factors. The aim of this research was to quantify the moisture retention capacity of volcanic soils as a threat indicator in the mass removal phenomena. This research was carried out on soils of the Malteria - Las Margaritas road transept to Magdalena river, right bank of the Chinchiná river in the Department of Caldas, Colombia. Through soil sample design, 3 altitudinal ranges were stratified as follows: high, medium and low. In fact, representative plant cover was taken in the study area, sampling the combination of the following variables: "plant cover" and "altitudinal range". In total, 52 points were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydraulic conductivity; Humidity threat; Soil aggregates; Soil mass removal; Stability.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400588

Cones in the Euclidean space with vanishing scalar curvature
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Barbosa,João Lucas M.; Carmo,Manfredo do.
Given a hypersurface M on a unit sphere of the Euclidean space, we define the cone based on M as the set of half-lines issuing from the origin and passing through M. By assuming that the scalar curvature of the cone vanishes, we obtain conditions under which bounded domains of such cone are stable or unstable.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stability; R-curvature; Cone; Scalar curvature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400001

Activity and Stability of Dispersed Multi Metallic Pt-based Catalysts for CO Tolerance in Proton Exchange Membrane Fuel Cell Anodes
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: HASSAN,AYAZ; TICIANELLI,EDSON A.
ABSTRACT Studies aiming at improving the activity and stability of dispersed W and Mo containing Pt catalysts for the CO tolerance in proton exchange membrane fuel cell (PEMFC) anodes are revised for the following catalyst systems: (1) a carbon supported PtMo electrocatalyst submitted to heat treatments; (2) Pt and PtMo nanoparticles deposited on carbon-supported molybdenum carbides (Mo2C/C); (3) ternary and quaternary materials formed by PtMoFe/C, PtMoRu/C and PtMoRuFe/C and; (4) Pt nanoparticles supported on tungsten carbide/carbon catalysts and its parallel evaluation with carbon supported PtW catalyst. The heat-treated (600 oC) Pt-Mo/C catalyst showed higher hydrogen oxidation activity in the absence and in the presence of CO and better stability,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat treatment; CO tolerance; Stability; Carbides; Quaternary catalysts.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200697

Conformational analysis of Pneumococcal Surface Antigen A (PsaA) upon zinc binding by fluorescence spectroscopy
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Bom,Ana Paula D. Ano; Corrêa,Izabella B.S.; Argondizzo,Ana Paula C.; Medeiros,Marco Alberto; Santos,Roger B. dos; Souza,Theo Luiz F. de; Silva Junior,José G. da.
ABSTRACT PsaA (pneumococcal surface antigen A) is a S. pneumoniae virulence factor that belongs to the metal transport system. The Manganese PsaA binding has been associated with oxidative stress resistance becoming a pivotal element in the bacteria virulence. It has been shown that Zinc inhibits the Manganese acquisition and promotes bacteria toxicity. We have performed a PsaA conformational analysis both in the presence (Zn-rPsaA) and in the absence of Zinc (free-rPsaA). We performed experiments in the presence of different Zinc concentrations to determine the metal minimum concentration which induced a conformational change. The protein in free and Zn-binding condition was also studied in pH ranging 2.6-8.0 and in temperature ranging 25oC-85oC. pH...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conformational analysis; RPsaA; Zinc; Stability; Streptococcus Pneumoniae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502299

Incorporating electrokinetic effects in the porochemoelastic inclined wellbore formulation and solution
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Nguyen,Vinh X.; Abousleiman,Youname N.
The porochemoelectroelastic analytical models and solutions have been used to describe the response of chemically active and electrically charged saturated porous media such as clays, shales, and biological tissues. However, these attempts have been restricted to one-dimensional consolidation problems, which are very limited in practice and not general enough to serve as benchmark solutions for numerical validation. This work summarizes the general linear porochemoelectroelastic formulation and presents the solution of an inclined wellbore drilled in a fluid-saturated chemically active and ionized formation, such as shale, and subjected to a three-dimensional in-situ state of stress. The analytical solution to this geometry incorporates the coupled solid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drilling; Electrokinetic; Inclined wellbore; Osmotic; Poromechanics; Stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100015

Stability and adaptability analysis of Tabapuã bulls for performance traits according to the herd level
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Marçal,M.F.; Ferraz Filho,P.B.; Souza,J.C.; Silva,L.O.C.; Gomes,F.J.; Freitas,J.A.
In order to study the stability and adaptability of Tabapuã cattle for the characteristic weight at 120 days of maternal effect, we used methods based on linear regression. The analysis included differences in the expected progeny of five sire sin herds located in four farms in the states of Bahia, (herds 1and 2), Paraná (herd 3) and Minas Gerais (herd 4). The results show that the performance of bulls depend largely on the genetic variability of the matrices for different characteristics in herds studied, allowing the recommendation of a specific breeding herd. Analyses of adaptability and stability discriminated performance differences in herds. Bulls were identified as adapted and perfectly stable, bulls with general adaptation, and with specific...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tabapuã; Adaptability; Sire x herd interaction; Stability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000100027

Isolation and genetic stability of an infectious bronchitis virus strain (IBV)
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Pereira,C.G.; Saraiva,G.L.; Santos,M.R.; Assao,V.S.; Fietto,J.L.R.; Bressan,G.C.; Almeida,M.R.; Moreira,M.A.S.; Silva Júnior,A.
RESUMO O vírus da bronquite infecciosa (IBV) é um importante patógeno respiratório presente na avicultura comercial e tem provocado grandes perdas econômicas em todo o mundo. A vacinação é realizada pela indústria produtora de aves, mas continuam surgindo novos sorotipos e variações antigênicas, dificultando o controle de IBV. Nós realizamos uma caracterização molecular de uma cepa de IBV obtida diretamente de tecidos e comparamos com a mesma cepa que havia sido passada três vezes em ovo embrionado. Nós mostramos uma variação significante na sequência viral depois de ter sido isolada em ovo embrionado.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Infectious bronchitis virus; Isolation; Characterization; Stability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000401333

Stability and toxicity of Clostridium perfringens type D epsilon prototoxin treated by iodine
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Rocha,P.H.; Assis,R.A.; Lobato,F.C.F.; Cardoso,V.N.; Heneine,L.G.D.
Purified epsilon prototoxin of Clostridium perfringens type D was produced, purified, and detoxified by the stoiechiometric method of non-radioactive iodine incorporation. Different degrees of iodination were perfomed and the toxicity of the derivatives were analysed by in vivo studies. Toxicity decreased inversely to the iodine incorporation. Eletrophoretic analysis showed different levels of stability of samples kept under different temperatures 4ºC, - 20ºC, and -80 ºC. The iodinated prototoxins were stocked for a period of four months.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clostridium perfringens; Epsilon toxin; Iodination; Stability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352008000400007

Structural-functional analysis of the oligomeric protein R-phycoerythrin
Provedor de dados: Biological Research
Autores: MARTÍNEZ-OYANEDEL,JOSÉ; CONTRERAS-MARTEL,CARLOS; BRUNA,CAROLA; BUNSTER,MARTA.
The structure of phycobiliproteins and their spatial organization in the phycobilisome provide the environment for high efficiency in light harvesting and conduction towards photosystem II. This article focuses on the analysis of R-phycoerythrin, a light harvesting hexameric phycobiliprotein that is part of the phycobilisomes. The interaction surfaces and the environment of the chromophores of R-phycoerythrin were studied in order to explain its structural stability and spectroscopic sensitivity, properties revealed by perturbation experiments. Three interaction surfaces are described (ab), (ab)3 and (ab)6. The analysis shows the importance of a subunits in the interaction between trimers, the homodimeric nature of the monomer (ab) and also the presence of...
Tipo: Journal article
Palavras-chave: 1eyx; Anchor points; Interaction surfaces; Stability; Spectroscopic sensitivity.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500003

Computer simulation of stability and control of tractor-trailed implement combinations under different operating conditions
Provedor de dados: Bragantia
Autores: Abu-Hamdeh,Nidal H.; Al-Jalil,Hamid F.
The mechanics of a tractor-trailer system moving up and down sloping ground under different operating conditions was theoretically simulated. A computer program was developed to analyze the system to predict the effect of both the trailer loading weight and the slope angle on the tractor stability, traction ability, and drawbar loading. The program was used to analyze a tractor-trailer system moving at uniform motion up and downhill. The results of this analysis showed that the tractor becomes unstable when towing a 3750 kg trailer uphill at 28° slope angle. Insufficient traction occurred at slope angles ranging from 15° to 18° corresponding to trailer weight of 3750 to 750 kg. The parallel component of drawbar pull reached a maximum value of 17318 N when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tractor-trailer; Stability; Traction; Sloping ground; Drawbar.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052004000100015

Soy Protein Isolate-Alginate Microspheres for Encapsulation ofEnterococcus faecalis HZNU P2
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Zhang,Yu; Zheng,Wei; Gu,Jian-Fei; Ni,Jian; Wang,Ling; Tang,Zhen-Xing; Shi,Lu-E.
ABSTRACTIn this work, the mixture of alginate and soy protein isolate used as a wall material was developed to encapsulateEnterococcus faecalis HZNU P2 (E. faecalis HZNU P2). The survival ability in the simulated gastric fluid (SGF) and bile salt solution, storage stability at different temperatures and release properties in the simulated intestinal fluid (SIF) of encapsulated cells were assessed. The results showed that encapsulation could offer sufficient protection toE. faecalis HZNU P2. The viability of encapsulatedE. faecalis HZNU P2 did not decrease in SGF at pH 2.5 or 2.0 after 2 h incubation, while free cells were reduced from 11 to 9.85 log CFU/mL in SGF (pH 2.5) at the same exposure time. Only minor viability of encapsulatedE. faecalis HZNU P2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enterococcus faecalis; Encapsulation; Soy protein isolate; Alginate; Stability; Viability.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500805

Formulated products containing a new phytase from Schyzophyllum sp. phytase for application in feed and food processing
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Salmon,Denise Naomi; Piva,Luíza Cesca; Binati,Renato Leal; Vandenberghe,Luciana Porto de Souza; Soccol,Vanete Thomaz; Soccol,Carlos Ricardo; Spier,Michele Rigon.
A new formulated product containing high yield of phytase from Schizophyllum sp., an important mushroom used for medicinal studies, was developed for application in feed industries and for future use in food processing. The enzyme presented a high activity yield 55.5 U/mL and 6240 U/gds in liquid and solid formulated product, respectively. It showed a good shelf-life in concentrated product, retaining 67.8% of its activity after 60 days of storage at room temperature and 90% of the activity was maintained in the liquid formulation after the same period. Powder bioformulated product maintained 77% of its activity after two months of storage, without the addition of chemical additives, which was named as a new bioformulated product containing high quantities...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytase; Shizophyllum sp; Downstream steps; Stability; Formulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600001

Effects of gamma radiation on the stability and degradation kinetics of phenolic compounds and antioxidant activity during storage of (Oryza sativa L.) black rice flour
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Ito,Vivian Cristina; Zielinski,Acácio Antônio Ferreira; Demiate,Ivo Mottin; Spoto,Marta; Nogueira,Alessandro; Lacerda,Luiz Gustavo.
Abstract The effects of gamma radiation (0, 1, 2 and 3 kGy) were used to evaluate the stability and thermal degradation kinetics of anthocyanins, as well as the stability of total phenolic compounds (TPC) and antioxidant activity at different temperatures (4, 25, 35 and 45 °C) during the storage (0, 30, 60, 90 and 120 days) of black rice flour. This flour can be used as ingredient for gluten-free cereal products with higher nutritional value. For this it is necessary to preserve the anthocyanin content during thermal processing and shelf-life periods. At time 0, the dose of 3 kGy provided all of the most available bioactive compounds, raising their antioxidant potential, except for TPC. During the storage at different temperatures up to 120 days, gradual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthocyanins; Bioactive compounds; Irradiation; Stability; Thermodynamic parameters; Pigmented rice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100500

Role of Glutaraldehyde in Imparting Stability to Immobilized β-Galactosidase Systems
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Satar,Rukhsana; Jafri,Mohammad Alam; Rasool,Mahmood; Ansari,Shakeel Ahmed.
ABSTRACT This review article highlights the role of glutaraldehyde as a matrix activator/stabilizer in imparting higher operational and thermal stability to β-galactosidase (βG) for biotechnological applications. Glutaraldehyde has been used extensively as a crosslinking agent as well as for functionalization of matrices to immobilize β-galactosidase. Immobilized β-galactosidase systems (IβGS) obtained as a result of glutaraldehyde treatment has been employed to hydrolyze whey and milk lactose in batch reactors, continuous packed-bed and fluidized bed reactors under various operational conditions. Moreover, these IβGS have also been utilized for the production of galactooligosaccharides in food, dairy and fermentation industries. It was observed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Β-galactosidase; Crosslinking; Glutaraldehyde; Immobilization; Stability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100447

A new biosurfactant produced by Candida glabrata UCP 1002: characteristics of stability and application in oil recovery
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Luna,Juliana Moura de; Sarubbo,Leonie; Campos-Takaki,Galba Maria de.
The production of a new biosurfactant by Candida glabrata UCP1002 was studied to evaluate the influence of the concentration of the cotton seed oil, glucose and yeast extract. The dynamics of the growth and surfactant production were showed for all the cultivation conditions studied. The best emulsification of the n-hexadecane, quantified by the emulsifying index was observed in the medium containing 7.5% cotton seed oil, 5% glucose and 0.3% yeast extract. The isolated biosurfactant showed a CMC of 2.5% and the surface tension at that point showed to be 31mN/m. The potential application of the biosurfactant in oil recovery from the sand, in acid and alkaline environments and over exposure to high salinity and different temperatures was demonstrated by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosurfactant; Candida glabrata; Surface tension; Stability; Cotton seed oil; Oil removal.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400001

Comparison of methods for phenotypic stability analysis of cassava (Manihot esculenta Crantz) genotypes for yield and storage root dry matter content
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Kvitschal,Marcus Vinícius; Vidigal Filho,Pedro Soares; Scapim,Carlos Alberto; Gonçalves-Vidigal,Maria Celeste; Sagrilo,Edvaldo; Pequeno,Manoel Genildo; Rimoldi,Fabrício.
The objective of this work was to compare different phenotypic stability methods by using yield and storage root dry matter content data of eight cassava genotypes, assessed in eight environments in northwest of Paraná State, Brazil. All the methodologies applied showed to be able to study the stability of cassava genotypes, but each with its peculiarities. The methodologies of Eskridge, Annicchiarico and Lin and Binns were the most appropriated on situation with smaller effect of G x E interaction. The AMMI analysis and the Toler and Burrows methodology were the most specific on detailing specific adaptations of cassava genotypes to favorable and unfavorable environments. It could be suggested to use simultaneous AMMI analysis and Toler and Burrows...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Correlation; Stability; Safety first indexes; Non-linear regression; AMMI analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100022

Activity of encapsulated Lactobacillus bulgaricus in alginate-whey protein microspheres
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Chen,Meng-Yan; Zheng,Wei; Dong,Qiu-Yue; Li,Zhen-Hua; Shi,Lu-E; Tang,Zhen-Xing.
In this work, alginate-whey protein was used as wall materials for encapsulating Lactobacillus delbrueckii subsp. bulgaricus (L. bulgaricus). The characteristics of encapsulated and free L. bulgaricus showed that the free L. bulgaricus lost viability after 1 min exposure to simulated gastric fluid (SGF) at pH 2.0 and 2.5. However, the viability of encapsulated L. bulgaricus did not decrease in SGF at pH 2.5 for 2 h incubation. The viable numbers of encapsulated L. bulgaricus decreased less than 1.0 log unit for 2 h incubation in SGF at pH 2.0. For bile stability, only 1.2 log units and 2.0 log units viability of the encapsulated L. bulgaricus was lost in 1 and 2% bile for 1 h exposure, respectively, compared with no survival of free L. bulgaricus under the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Encapsulation; Alginate; Whey protein; Probiotics; Stability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500736

Prediction of Hevea progeny performance in the presence of genotype-environment interaction
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Gonçalves,Paulo de Souza; Moraes,Mário Luiz Teixeira de; Silva,Marcelo de Almeida; Gouvêa,Lígia Regina Lima; Aguiar,Adriano Tosoni da Eira; Costa,Reginaldo Brito da.
Twenty two open-pollinated Hevea progenies from different parental clones of the Asian origin were tested at five sites in the Northwestern São Paulo State Brazil to investigate the progeny girth growth, rubber yield, bark thickness and plant height. Except for the rubber yield, the analysis of variance indicated highly significant (p&lt;0.01) genotype x environment interaction and heterogeneity of regressions among the progenies. However, the regression stability analysis identified only a few interacting progenies which had regression coefficients significantly different from the expected value of one. The linear regressions of the progeny mean performance at each test on an environmental index (mean of all the progenies in each test) showed the general...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Stability; Adaptability; Environmental index; Linear regression.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100004

Temporal dynamics of stomatal conductance of plants under water deficit: can homeostasis be improved by more complex dynamics?
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Souza,Gustavo Maia; Oliveira,Ricardo Ferraz de; Cardoso,Victor José Mendes.
In this study we hypothesized that chaotic or complex behavior of stomatal conductance could improve plant homeostasis after water deficit. Stomatal conductance of sunflower and sugar beet leaves was measured in plants grown either daily irrigation or under water deficit using an infrared gas analyzer. All measurements were performed under controlled environmental conditions. In order to measure a consistent time series, data were scored with time intervals of 20s during 6h. Lyapunov exponents, fractal dimensions, KS entropy and relative LZ complexity were calculated. Stomatal conductance in both irrigated and non-irrigated plants was chaotic-like. Plants under water deficit showed a trend to a more complex behaviour, mainly in sunflower that showed better...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta vulgaris; Complexity; Helianthus annus; Stability; Time series analyses; Water deficit.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300013

Stabilization of serum antibody responses triggered by initial mucosal contact with the antigen independently of oral tolerance induction
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Verdolin,B.A.; Ficker,S.M.; Faria,A.M.C.; Vaz,N.M.; Carvalho,C.R.
Initial contacts with a T-dependent antigen by mucosal routes may result in oral tolerance, defined as the inhibition of specific antibody formation after subsequent parenteral immunizations with the same antigen. We describe here an additional and permanent consequence of these initial contacts, namely, the blockade of secondary-type responsiveness to subsequent parenteral contacts with the antigen. When repeatedly boosted ip with small doses (3 µg) of ovalbumin (OVA) (or lysozyme), primed B6D2F1 mice showed progressively higher antibody responses. In contrast, mice primed after a single oral exposure to the antigen, although repeatedly boosted, maintained their secondary antibody titers on a level which was inversely proportional to the dose of antigen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oral tolerance; Mucosal immunity; Stability; Memory.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200008

Influence of storage time on DNA of Chlamydia trachomatis, Ureaplasma urealyticum, and Neisseria gonorrhoeae for accurate detection by quantitative real-time polymerase chain reaction
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Lu,Y.; Rong,C.Z.; Zhao,J.Y.; Lao,X.J.; Xie,L.; Li,S.; Qin,X.
The shipment and storage conditions of clinical samples pose a major challenge to the detection accuracy of Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG), and Ureaplasma urealyticum (UU) when using quantitative real-time polymerase chain reaction (qRT-PCR). The aim of the present study was to explore the influence of storage time at 4°C on the DNA of these pathogens and its effect on their detection by qRT-PCR. CT, NG, and UU positive genital swabs from 70 patients were collected, and DNA of all samples were extracted and divided into eight aliquots. One aliquot was immediately analyzed with qRT-PCR to assess the initial pathogen load, whereas the remaining samples were stored at 4°C and analyzed after 1, 2, 3, 7, 14, 21, and 28 days. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Storage time; Chlamydia trachomatis; Ureaplasma urealyticum; Neisseria gonorrhoeae; Stability; QRT-PCR.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016001000701

Time collection and storage conditions of lipid profile
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: França,C.N.; Mendes,C.C.; Ferreira,C.E.S.
The stability of samples is crucial for getting reliable concentrations of many analytes, including lipid profile. Thus, the goal of this study was to analyze lipid profile under different storage and temperature conditions. This was a prospective study with 809 patients of both genders. Total cholesterol, triglycerides, high-density lipoprotein cholesterol, low density lipoprotein cholesterol and non-high-density lipoprotein were measured within 1 h from collection at room temperature, after 2-3 h of refrigeration (8°C) and after 4-5 h at room temperature. The processing time and storage conditions did not affect the analytes measured. These findings are important for multicenter studies, because of the difficulties related to centrifugation and freezing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipid profile; Storage; Temperature; Stability; Refrigerator; Room temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000300608

Amylase production by solid-state fermentation of agro-industrial wastes using Bacillus sp.
Provedor de dados: Brazilian Journal of Microbiology
Autores: Saxena,Rajshree; Singh,Rajni.
Solid state fermentation was carried out using various agro- industrial wastes with the best amylase producing strain isolated from soil. Different physicochemical conditions were varied for maximum enzyme production. The strain produced about 5400 units/g of amylase at 1:3 moisture content, 20% inoculum, after 72 h of incubation with Mustard Oil seed cake as the substrate. The optimum temperature and pH of the enzyme activity were found to be 50ºC and 6 respectively. The enzyme was found to be thermostable at 70ºC for about 2 h without any salt. It showed stability at pH range 5-7. The metal ions as Na+, Ca++, Mg++ and Co++ enhanced the enzyme activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid State Fermentation; Agro-industrial wastes; Amylase; Enzyme optimization; Stability; Bacillus sp.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000400014

New production process of the antifungal chaetoglobosin A using cornstalks
Provedor de dados: Brazilian Journal of Microbiology
Autores: Jiang,Cheng; Song,Jinzhu; Zhang,Junzheng; Yang,Qian.
Abstract Chaetoglobosin A is an antibacterial compound produced by Chaetomium globosum, with potential application as a biopesticide and cancer treatment drug. The aim of this study was to evaluate the feasibility of utilizing cornstalks to produce chaetoglobosin A by C. globosum W7 in solid-batch fermentation and to determine an optimal method for purification of the products. The output of chaetoglobosin A from the cornstalks was 0.34 mg/g, and its content in the crude extract was 4.80%. Purification conditions were optimized to increase the content of chaetoglobosin A in the crude extract, including the extract solvent, temperature, and pH value. The optimum process conditions were found to be acetone as the extractant, under room temperature, and at a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaetoglobosin A; Cornstalk; Purification; Stability; Chaetomium globosum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300410

Optimization of cosmetic formulations development using Box-Behnken design with response surface methodology: physical, sensory and moisturizing properties
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Mercurio,Daiane Garcia; Calixto,Lívia Salomão; Campos,Patrícia Maria Berardo Gonçalves Maia.
Considering the importance of an adequate composition of the formulation in the development of stable, safe and effective cosmetic products, experimental design techniques are tools that can optimize the formulation development process. The objective of this study was to develop topical formulations using the Box-Behnken design with response surface methodology and evaluate its physical, sensory and moisturizing properties. The experimental design used in the first step allowed to identify and to quantify the influence of raw materials, as well as the interaction between them. In the second step, the analysis identified the influence of soy lecithin, the phytantriol and capric acid triglyceride and caprylic on the consistency index, stickiness and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emulsions; Formulation; Stability; Skin barrier; Experimental design.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100624

Prednisone raw material characterization and formulation development
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Toehwé,Leonardo Henrique; Prado,Livia Deris; Rocha,Helvécio Vinícius Antunes.
ABSTRACT Solid dosage forms for oral use, particularly tablets, are the most highly used dosage forms in therapy because they are easily administered, have high productivity and relatively low cost and provide a more stable drug to form a semi-solid net. Numerous parameters influence the quality of the final dosage form. In this study, the dissolution profile of 20-mg prednisone tablets bioequivalent to the reference product and three test formulations were evaluated using stability testing. During the study, prednisone tablets and the active pharmaceutical ingredient (API) prednisone from two different manufacturers were characterized with respect to their physical and physicochemical properties. The results showed that the dissolution profiles of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prednisone/tablets/dissolution; Solubility; Formulation; Stability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000400604

Promotion of cutaneous penetration of nifedipine for nanoemulsion
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Arantes,Paula de Oliveira; Santos,Quesia Nery dos; Freitas,Zaida Maria Faria de; Pyrrho,Alexandre dos Santos; Cerqueira-Coutinho,Cristal; Villa,Ana Lucia Vazquez; Santos,Elisabete Pereira dos; Ricci-Júnior,Eduardo.
ABSTRACT This article reports the development and characterization of a nanoemulsion (NE) able to improve the cutaneous penetration of nifedipine. NE with nifedipine was development and characterized, presenting droplet size of 20 nm with low polydispersity index (IP&lt;0.1), spherical shape without aggregation, pH compatible with typical skin levels and stability evaluated by seven months. In the permeation studies, a classical formulation based in an oil/water cream containing nifedipine was used for comparison with NE. Nanoemulsion promoted and improved the retention of nifedipine in the epidermis and dermis in relation to classical formulation. This promoting effect is related to the nanometric size of the droplets of the NE (20 nm), which give him a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Topical nifedipine/cutaneous permeation; Nanoemulsion/characterization; Stability; Cutaneous permeation/study; Healing of wounds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000200628

Fabrication, physicochemical characterization and preliminary efficacy evaluation of a W/O/W multiple emulsion loaded with 5% green tea extract
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Mahmood,Tariq; Akhtar,Naveed; Khan,Barkat Ali; Rasul,Akhtar; Khan,Haji M. Shoaib.
Complex multiple emulsions have an excellent ability to fill large volumes of functional cosmetic agents. This study was aimed to encapsulate large volume of green tea in classical multiple emulsion and to compare its stability with a multiple emulsion without green tea extract. Multiple emulsions were developed using Cetyl dimethicone copolyol as lipophilic emulsifier and classic polysorbate-80 as hydrophilic emulsifier. Multiple emulsions were evaluated for various physicochemical aspects like conductivity, pH, microscopic analysis, rheology and these characteristics were followed for a period of 30 days in different storage conditions. In vitro and in vivo skin protection tests were also performed for both kinds of multiple emulsions i.e. with active...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cosmetics; Green tea; Multiple emulsion; Rheology; Skin; Stability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000200016

Evaluation of the stability of Polymyxin B in saline and glucose solutions using LC-MS/MS
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Castilhos,Juliana Kich; Dillenburg,Thaís Luise; Antunes,Marina Venzon; Scribel,Letícia; Zavascki,Alexandre Prehn; Linden,Rafael; Verza,Simone Gasparin.
Polymyxins are a group of antibacterial substances and have remained the drugs of choice for treatment of resistant Gram-negative bacilli. Polymyxin B is administered by intravenous infusion and requires the reconstitution of lyophilized powder with 0.9% saline or 5% glucose solutions. To date, there is little information about polymyxin stability in different infusions solutions, especially at 40 ºC, a temperature that is recommended to study drug stability as it accelerates degradation reactions. Therefore, in this work an analytical method using LC-MS/MS was developed, validated and applied to determine the stability of polymyxin B diluted in 0.9% saline or 5% glucose solutions at 25 ºC and 40 ºC. The stability of polymyxin B solutions was evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polymyxin; Stability; LC-MS/MS; Glucose solutions; Saline solutions.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100537

A stability-indicating HPLC-PDA method for the determination of ferulic acid in chitosan-coated poly(lactide-co-glycolide) nanoparticles
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Lima,Isabela Angeli de; Khalil,Najeh Maissar; Mainardes,Rubiana Mara.
ABSTRACT The development and validation of a simple and efficient method for the quantification of ferulic acid in poly (D,L-lactide-co-glycolide) (PLGA) nanoparticles coated with chitosan (CS) by reverse phase high performance liquid chromatography coupled to photodiode array detection was described. For the chromatographic analysis, a reverse phase C-18 column was used, mobile phase consisting of acetonitrile and 0.5% acetic acid (37:63, v/v), isocratically eluted at a flow rate of 1 mL/min. Drug determination was performed at 320 nm. The method was validated in terms of the selectivity, linearity, precision, accuracy, robustness, limits of detection and quantification. The method was linear in the range of 10 to 100 μg/mL (r=0.999) and presented limit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nanoparticles; Ferulic acid/encapsulation efficiency; Ferulic acid/quantification; Stability; High performance liquid chromatography/validation; PLGA-poly(lactide-co-glycolide)/nanoparticles; Chitosan.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000200627

Freeze-drying of ampicillin solid lipid nanoparticles using mannitol as cryoprotectant
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Alihosseini,Faezeh; Ghaffari,Solmaz; Dabirsiaghi,Ali Reza; Haghighat,Setareh.
abstract Solid lipid nanoparticles (SLNs) are interesting colloidal drug-delivery systems, since they have all the advantages of the lipid and polymeric nanoparticles. Freeze-drying is a widely used process for improving the stability of SLNs. Cryoprotectants have been used to decrease SLN aggregations during freeze-drying. In this study Ampicillin was chosen to be loaded in a cholesterol carrier with nano size range. To support the stability of SLNs, freeze-drying was done using mannitol. Particle size, drug release profile and antibacterial effects were studied after freeze-drying in comparison with primary SLNs. Preparations with 5% mannitol showed the least particle size enlargement. The average particle size was 150 and 187 nm before and after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid lipid nanoparticles; Stability; Cryoprotectant; Freeze-drying; Antibacterial efficacy; Particle size.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000400797

Development and validation of an HPLC-UV method for accelerated stability study and pharmacokinetic analysis of venlafaxine
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Sher,Muhammad; Ahmad,Maria; Hassan,Faiza; Naeem-ul-Hassan,Muhammad; Hussain,Muhammad Ajaz.
A reverse phase high performance liquid chromatography method has been developed and validated for accelerated stability study and determination of pharmacokinetic parameters of venlafaxine HCl. The chromatographic separation was carried out using ODS analytical column (250 × 4.6 mm i.d., 5 µm particle size). The mobile phase included acetonitrile, methanol and potassium dihydrogen phosphate buffer (30:30:40; pH 6.1) at a flow rate 1.5 mL min−1. UV-Visible detector was used at wavelength of 227 nm to monitor elutions. Retention time observed was 2.745 min. The method was validated for linearity, accuracy, precision, sensitivity and robustness. Accelerated stability study of venlafaxine HCl capsules was carried out at 40 and 50 ºC under 75% RH level....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Venlafaxine; HPLC; Stability; Pharmacokinetics; Chromatography.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100514

Preparation of extemporaneous oral liquid in the hospital pharmacy
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Silva,Márcio Robert Mattos da; Dysars,Letícia Pereira; Santos,Elisabete Pereira dos; Ricci Júnior,Eduardo.
At the hospital, the pharmacist is constantly challenged to prepare extemporaneous solutions from tablets, capsules or drug powder for patients unable to swallow, such as pediatric, elderly and patients that use nasoenteric and nasogastric tubes. The preparation of extemporaneous solutions from capsules, tablets and drug powder requires stability studies analysis. This article is a bibliographic review of preparation of extemporaneous oral liquid from solid oral dosage forms used in clinical practice. The selected articles contain all the information regarding manipulation techniques, pharmaceutical excipients, packaging, storage conditions and results of stability studies above 90% performed by HPLC analysis. In addition, a situational analysis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extemporaneous oral liquid; Stability; Hospital pharmacy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100703

Stability evaluation of organic Lip Balm
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Fernandes,Alessandra Ribeiro; Dario,Michelli Ferrera; Pinto,Claudinéia Aparecida Sales de Oliveira; Kaneko,Telma Mary; Baby,André Rolim; Velasco,Maria Valéria Robles.
Rising global demand for natural products whose production is harmless to the environment has stimulated the development of natural cosmetics and, within this category, organics (95% organic raw materials). The image of environmentally friendly production is one of the strongest attractions of organic products. Lip balm is a cosmetic product similar to lipstick whose purpose is to prevent lip dryness and protect against adverse environmental factors. The product's characteristics are: resistance to temperature variations, pleasant flavor, innocuousness, smoothness during application, adherence and easy intentional removal. This work involved the development of a lip balm formulated with certified organic raw materials and the execution of stability tests:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lip balm; Stability; Cocoa butter; Cosmetic; Organic.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000200011

Preparation and evaluation of 2-methoxyestradiol-loaded pH-sensitive liposomes
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: He,Suna; Wang,Bowen; Zhang,Runfang; Zhou,Huanhuan; Yang,Qian.
The development and clinical application of 2-methoxyestradiol (2-ME) as a new type of antitumor drug are limited due to its poor solubility, rapid metabolism in vivo, and large oral dosage. 2-ME-loaded pH-sensitive liposomes (2-ME-PSLs) was prepared containing the lipids, Lipoid E-80 (E-80), cholesteryl hemisuccinate (CHEMS), and cholesterol (CHOL) via thin-film ultrasonic dispersion. First, preparation conditions of 2-ME-PSLs were optimized by orthogonal test. Then 2-ME-PSL was characterized, and the release behavior and stability of 2-ME-PSL in vitro were evaluated. The optimal preparation conditions for 2-ME-PSLs were as follows: 2-ME : E-80+CHEMS 1:15; CHOL : E-80+CHEMS 1:5; ultrasonication time 20 minutes. The mean particle size, PDI, zeta potential,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2-Methoxyestradiol; PH sensitive liposomes; In vitro release; Stability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100544

Effect of Californian Red Worm (Eisenia foetida) on the Nutrient Dynamics of a Mixture of Semicomposted Materials
Provedor de dados: Chilean Journal of Agricultural Research
Autores: Castillo,Hugo; Hernández,Adriana; Dominguez,David; Ojeda,Damaris.
The efficiency of composting processes with and without the addition of Californian red worms (Eisenia foetida) was evaluated, using manure of dairy cows to generate organic fertilizer. Several parameters were assessed as physio-chemical indicators of maturity, such as temperature, pH, C/N ratio, phytotoxicity and macro and micronutrients at 25 and 54 ws (mature and stored products, respectively). A linear model was used in the statistical analysis, with four replicates that included as fixed effects, the composting systems and time. At 25 wk, both systems reduced the C/N ratio to values of 15.5 in vermicompost and 17.1 in semi-compost. The content of total N, N-NO3, Ca and some micronutrients also increased. K and Na concentrations were higher in the...
Tipo: Journal article
Palavras-chave: Fertilizer; Organic; Maturation; Stability.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300014

Utilization of zein-based coatings containing vegetable oils on the physicochemical characteristics of vacuum-packaged lamb meat
Provedor de dados: Ciência Rural
Autores: Cordeiro,Cecília de Souza; Forato,Lucimara Aparecida; Bernardes Filho,Rubens; Nassu,Renata Tieko.
ABSTRACT:  During the shelf-life of fresh meat, physical, chemical, microbiological, and sensory changes may occur. To avoid such changes, the combination of vacuum-packaging and use of edible coatings make a good strategy. This study aimed to evaluate the physicochemical characteristics of vacuum-packaged lamb meat combined with different zein-based edible coatings containing different vegetable oils (pink pepper, rosemary, olive oil, and the combinations of olive oil + pink pepper or rosemary), stored at 5 ± 1 °C. Parameters including pH, instrumental color, water holding capacity (WHC), shear force, and thiobarbituric acid reactive substances (TBARS) were analyzed every seven days, for 29 days. Significant differences (P&lt;0.05) were observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Packaging; Plasticizers; Stability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001000753

Factor analysis and SREG GGE biplot for the genotype × environment interaction stratification in maize
Provedor de dados: Ciência Rural
Autores: Fritsche-Neto,Roberto; Miranda,Glauco Vieira; DeLima,Rodrigo Oliveira; Souza,Heraldo Namorato de.
The objective of this study was to evaluate the use of SREG GGE biplot methodology and factor analysis to stratify the genotype×environment interaction in maize. Forty-nine early maize hybrids were evaluated in nine environments. The experimental design used was a 7×7 square lattice with two replicates. Each plot consisted of two 5m long rows spaced 0.90m apart. Grain yield data were used to perform the analysis. The results indicated the existence of two mega-environments in the State of Minas Gerais, Brazil, for early maize hybrids. The stratification of the environment by factor analysis was more selective to join the similarity the according with cultivar performance. However, this approach did not identify specific genotype x environment interactions,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Adaptability; Stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000500007

Extraction of &amp;#947-oryzanol from rice bran
Provedor de dados: Ciência e Agrotecnologia
Autores: Heidtmann-Bemvenuti,Renata; Nora,Náthali Saião; Badiale-Furlong,Eliana.
γ-oryzanol, a phytochemical, has antioxidant activities and potential health benefits. In this study, we aimed to develop a method for extracting high amounts of γ-oryzanol from rice bran and for verifying its stability in different solvents. Of the 5 methods under investigation, the one that yielded the highest γ-oryzanol content was further improved by using a central composite rotational design (DCCR - 2(4), including 8 tests in axial conditions and 4 central points, totaling 28 trials). The parameters under study were temperature, time, volume, and the ratio of hexane:isopropanol. High γ-oryzanol content (13.98 mg.g-1) was obtained by using the following extraction conditions: 40° C, 40 min, and 75 mL hexane:isopropanol (1:3). The limits of detection...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Spectrophotometer; Stability; Phytochemistry.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600008

Thermal decomposition of torrefied and carbonized briquettes of residues from coffee grain processing
Provedor de dados: Ciência e Agrotecnologia
Autores: Protásio,Thiago de Paula; Melo,Isabel Cristina Nogueira Alves de; Guimarães Junior,Mario; Mendes,Rafael Farinassi; Trugilho,Paulo Fernando.
The use of biomass has been recognized as a potential renewable energy and an alternative substitute that contributes to the decrease of fossil fuels consumption. Therefore, this research aimed to analyze the thermal behavior of briquettes made of residues from coffee grain processing in different conditions: in natura, torrefied and carbonized. Eucalyptus sawdust was used for comparison. The briquettes were carbonized considering final temperature of 450° C (kept for 30 min). The briquettes torrefaction was performed in an electric oven (muffle) using two heating rates until 250° C (kept 60 min). The thermal-gravimetric analysis was made in nitrogen atmosphere until the temperature of 600° C. The contents of fixed carbon and volatile matter of the fuels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid biofuels; Residual biomass; Coffee plantations; Stability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000300004