Consulta: subjectFacets:"Multivariate analysis"
Registros recuperados: 181
Data/hora: 10/06/2024 11:18:44

Análisis del sistema de producción ovina asociada a la agricultura de temporal en el Nor-Poniente de Tlaxcala
Provedor de dados: 32
Autores: Galaviz Rodríguez, Reyes.
El objetivo del trabajo fue analizar la producción de ovinos asociada a la agricultura de temporal, para determinar los parámetros productivos y económicos que ayuden a orientar la toma de decisiones de los productores de la región nor-poniente del estado de Tlaxcala. El estudio se realizó en seis municipios del Distrito de Desarrollo Rural Calpulalpan (DDR 163) y comprendió dos etapas: a) se caracterizó el sistema de producción de ovinos con la información de 228 explotaciones seleccionadas en forma aleatoria, y b) se dio  seguimiento a 610 corderos en 15 rebaños desde el nacimiento hasta los 200 días de edad. Se estimaron los estadísticos descriptivos para las variables de las explotaciones y se clasificaron con técnicas multivariadas. El crecimiento de...
Tipo: Tesis
Palavras-chave: Tipología de explotaciones; Modelos de crecimiento de corderos; Análisis multivariados; Ganancia diaria de peso; Doctorado; EDAR; Estrategias para el Desarrollo Agrícola Regional; Farm typology; Lamb growth model; Multivariate analysis; Daily gain lamb growth.
Ano: 2009
URL: http://hdl.handle.net/10521/1331

Bases para el establecimiento de programas de selección de cabras lecheras locales con campesinos del Valle de Libres, Puebla.
Provedor de dados: 32
Autores: Santos Chávez, Yesenia Alma.
Con el objetivo de analizar el sistema de producción caprina para determinar la factibilidad de establecer un programa de selección de cabras lecheras con campesinos del Valle de Libres, Puebla, en una primera etapa se estudiaron los recursos productivos y aspectos socioeconómicos de 84 productores de cabras y en la segunda, se clasificaron a las explotaciones caprinas de 79 productores para identificar al grupo con más posibilidades de participar en el programa de selección de cabras locales. Con la información obtenida se estimaron estadísticos descriptivos, análisis de varianza y por medio de análisis multivariados se construyó la tipología de explotaciones caprinas. Los productores tienen 51.3±1.3 años de edad, 16.3±1.8 años de experiencia y 5.1±0.23...
Palavras-chave: Tipología explotaciones caprinas; Prácticas de manejo; Análisis multivariados; Ingresos; Goat farm typology; Management practices; Multivariate analysis; Income; Maestría; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/461

Análisis de la producción familiar de carne de conejo (Oryctolagus cuniculus) en el municipio de El oro, Estado de México
Provedor de dados: 32
Autores: Mercado Jiménez, Luis.
5,703.8±2,826.5) y progresivamente alto para las semicomerciales (
Tipo: Tesis
Palavras-chave: Cunicultura familiar; Análisis multivariado; Tasa de crecimiento postdestete rabbit backyard production; Multivariate analysis; Post-weaning growing rate.
Ano: 2008
URL: http://hdl.handle.net/10521/1093

Análisis de la producción familiar de carne de conejo (Oryctolagus cuniculus) en el municipio de El Oro, Estado de México
Provedor de dados: 32
Autores: Mercado Jiménez, Luis.
Los objetivos del presente estudio fueron describir el sistema de producción de conejo (Oryctolagus cuniculus) de traspatio del Municipio El Oro, estado de México, y el crecimiento de los conejos posterior al destete hasta la venta. Se aplicó un cuestionario a 31 explotaciones cunícolas y se registró el peso en 440 conejos en crecimiento. La base de datos de la explotación se analizó con análisis multivariados y los datos para peso vivo de los conejos se analizaron con un modelo mixto para medidas repetidas en el tiempo. Las explotaciones cunícolas se agruparon como sistemas tipo familiar en traspatio (74.2%), semicomerciales (16.1%) y comerciales (9.7%). El tamaño de las explotaciones de tipo familiar es sumamente pequeño y poco variable (7.7±1.5)...
Tipo: Tesis
Palavras-chave: Cunicultura familiar; Análisis multivariado; Tasa de crecimiento postdestete; Maestría; EDAR; Estrategías para el Desarrollo Agrícola Regional; Rabbit backyard production; Multivariate analysis; Post-weaning growing rate.
Ano: 2008
URL: http://hdl.handle.net/10521/1404

Bases para el establecimiento de programas de selección de cabras lecheras locales con campesinos del Valle de Libres, Puebla.
Provedor de dados: 32
Autores: Santos Chávez, Yesenia Alma.
Con el objetivo de analizar el sistema de producción caprina para determinar la factibilidad de establecer un programa de selección de cabras lecheras con campesinos del Valle de Libres, Puebla, en una primera etapa se estudiaron los recursos productivos y aspectos socioeconómicos de 84 productores de cabras y en la segunda, se clasificaron a las explotaciones caprinas de 79 productores para identificar al grupo con más posibilidades de participar en el programa de selección de cabras locales. Con la información obtenida se estimaron estadísticos descriptivos, análisis de varianza y por medio de análisis multivariados se construyó la tipología de explotaciones caprinas. Los productores tienen 51.3±1.3 años de edad, 16.3±1.8 años de experiencia y 5.1±0.23...
Palavras-chave: Tipología explotaciones caprinas; Prácticas de manejo; Análisis multivariados; Ingresos; Goat farm typology; Management practices; Multivariate analysis; Income; Maestría; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/461

La política agrícola en México durante el periodo 1995-2009: un análisis multivariado.
Provedor de dados: 32
Autores: Delgadillo Aguilar, Nicéforo.
Las políticas agrícolas, requieren de una coherencia con las políticas macroeconómicas. El objetivo central de la investigación, fue analizar la participación del gobierno mexicano en el desarrollo del sector agropecuario en el periodo de 1995 a 2009. La metodología utilizada es mediante el análisis multivariado. La política agrícola se clasifico en  cuatro grupos, y en cada uno se efectuó un análisis de componentes principales, de donde se obtuvo por un lado información referente a la estructura de cada grupo, y por el otro, dadas las propiedades del análisis, se redujo el número de variables originales de política agrícola a unas cuantas variables nuevas o componentes principales. Esto permitió realizar un análisis de política global con cuatro...
Palavras-chave: Política agrícola; Análisis multivariado; Producto interno bruto agropecuario; Agricultural policy; Multivariate analysis; Agricultural gross domestic product; Maestría; Economía.
Ano: 2011
URL: http://hdl.handle.net/10521/427

Clasificación integral de sistemas de cultivo minifundistas irrigados = Classification of small-farm irrigated cropping systems
Provedor de dados: 32
Autores: Fortanelli Martínez, Javier; Figueroa Sandoval, Benjamín; González Cossío, Felix Valerio.
En este trabajo se ensaya la aplicación de un principio integral para la clasificación de sistemas de cultivo minifundistas irrigados por bombeo. Se utiliza como herramienta estadística básica el análisis multivariado, con base en las técnicas de componentes principales, de correlación canónica y de conglomerados. Los criterios de clasificación utilizados, acordes con el enfoque integral de la agricultura, son técnicos, económicos y de orientación productiva. Los resultados señalan la existencia hipotética de cinco sistemas de cultivo ubicados dentro de una tendencia que va de aquellos que cultivan principalmente maíz (Zea mays L.) y frijol (Phaseolus vulgaris L.) con técnica tradicional, bajos costos de producción e intenso uso de la fuerza de trabajo...
Tipo: Artículo
Palavras-chave: Sistemas de cultivo; Análisis multivariado; Zea mays; Phaseolus vulgaris; Farming systems; Multivariate analysis; Análisis estadístico; Statistical analysis.
Ano: 2012
URL: http://hdl.handle.net/10521/1753

La política agrícola en México durante el periodo 1995-2009: un análisis multivariado.
Provedor de dados: 32
Autores: Delgadillo Aguilar, Nicéforo.
Las políticas agrícolas, requieren de una coherencia con las políticas macroeconómicas. El objetivo central de la investigación, fue analizar la participación del gobierno mexicano en el desarrollo del sector agropecuario en el periodo de 1995 a 2009. La metodología utilizada es mediante el análisis multivariado. La política agrícola se clasifico en  cuatro grupos, y en cada uno se efectuó un análisis de componentes principales, de donde se obtuvo por un lado información referente a la estructura de cada grupo, y por el otro, dadas las propiedades del análisis, se redujo el número de variables originales de política agrícola a unas cuantas variables nuevas o componentes principales. Esto permitió realizar un análisis de política global con cuatro...
Palavras-chave: Política agrícola; Análisis multivariado; Producto interno bruto agropecuario; Agricultural policy; Multivariate analysis; Agricultural gross domestic product; Maestría; Economía.
Ano: 2011
URL: http://hdl.handle.net/10521/427

La producción de ovinos pelibuey en agroecosistemas campesinos de la región de Libres, Puebla
Provedor de dados: 32
Autores: Hernández Loma, Raymundo.
Se realizó un estudio para analizar el sistema de producción de ovinos Pelibuey y determinar el crecimiento de corderos en el Valle de Puebla. El estudio comprendió dos etapas: En la primera, se realizó una encuesta directa con 80 productores y en la segunda, se evaluó el crecimiento de 140 corderos de los 15 días de nacidos a los 156 días de edad. Con la encuesta se registró información de los recursos utilizados en la producción de ovinos: mano de obra, áreas comunales de pastoreo, rastrojos de cultivos agrícolas, características del rebaño e insumos externos. Para el análisis de la información se utilizó el paquete estadístico SAS. Se estimaron los estadísticos descriptivos para todas las variables de las explotaciones y se clasificaron con técnicas...
Tipo: Tesis
Palavras-chave: Ovinos de pelo; Crecimiento de corderos; Peso vivo; Análisis multivariado hair sheep; Lamb growth; Body weight; Multivariate analysis.
Ano: 2012
URL: http://hdl.handle.net/10521/1058

La producción de ovinos pelibuey en agroecosistemas campesinos de la región de Libres, Puebla
Provedor de dados: 32
Autores: Hernández Loma, Raymundo.
Se realizó un estudio para analizar el sistema de producción de ovinos Pelibuey y determinar el crecimiento de corderos en el Valle de Puebla. El estudio comprendió dos etapas: En la primera, se realizó una encuesta directa con 80 productores y en la segunda, se evaluó el crecimiento de 140 corderos de los 15 días de nacidos a los 156 días de edad. Con la encuesta se registró información de los recursos utilizados en la producción de ovinos: mano de obra, áreas comunales de pastoreo, rastrojos de cultivos agrícolas, características del rebaño e insumos externos. Para el análisis de la información se utilizó el paquete estadístico SAS. Se estimaron los estadísticos descriptivos para todas las variables de las explotaciones y se clasificaron con técnicas...
Tipo: Tesis
Palavras-chave: Ovinos de pelo; Crecimiento de corderos; Peso vivo; Análisis multivariado; Maestría; EDAR; Estrategías para el Desarrollo Agrícola Regional; Hair sheep; Lamb growth; Body weight; Multivariate analysis.
Ano: 2009
URL: http://hdl.handle.net/10521/1376

Spray adjuvant characteristics affecting agricultural spraying drift
Provedor de dados: 70
Autores: OLIVEIRA,RONE B. DE; ANTUNIASSI,ULISSES R.; GANDOLFO,MARCO A.
This study defined the main adjuvant characteristics that may influence or help to understand drift formation process in the agricultural spraying. It was evaluated 33 aqueous solutions from combinations of various adjuvants and concentrations. Then, drifting was quantified by means of wind tunnel; and variables such as percentage of droplets smaller than 50 μm (V50), 100 μm (V100), diameter of mean volume (DMV), droplet diameter composing 10% of the sprayed volume (DV0.1), viscosity, density and surface tension. Assays were performed in triplicate, using Teejet XR8003 flat fan nozzles at 200 kPa (medium size droplets). Spray solutions were stained with Brilliant Blue Dye at 0.6% (m/ v). DMV, V100, viscosity cause most influence on drift hazardous....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Droplet size; Wind tunnel; Experimental methods; Correlations; Multivariate analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000100109

DIFFERENT GENDER DIVISION PATTERNS FOR SWINE HOUSING IN WEAN-TO-FINISH SYSTEM
Provedor de dados: 70
Autores: Massari,Juliana M.; Vercellino,Rimena do A.; Curi,Thayla M. R. de C.; Moura,Daniella J. de; Medeiros,Brenda B. L.; Salgado,Douglas D'Alessandro.
ABSTRACT This study aimed at identifying the best gender division pattern for swine at nursery stage, through the evaluation of behavioral and environmental parameters. Three treatments were established to achieve our objective: single-sex housing of 26 surgically castrated male pigs; mixed-sex housing of 13 castrated males and 13 females; and single-sex housing of 26 females. Environmental and behavioral data have been recorded. It was used an ethogram to make an inventory of behaviors and that was used in multivariate analysis. Bite addiction differed statistically among treatments, and the lowest occurrence was in mixed-sex housing. Results of the multivariate analysis suggested that regardless of the treatment chosen, relative humidity is positively...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Welfare; Behavior; Facilities.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100013

SPATIAL VARIABILITY IN LEAF ANALYSIS AND PRODUCTIVITY OF FERTIRRIGATED AÇAÍ
Provedor de dados: 70
Autores: Ribeiro,Felipe O.; Fernandes,Antonio R.; Matos,Gilson S. B. de; Lindolfo,Marcelo M.; Guedes,Rafael S.; Rodrigues,Graziele R.
ABSTRACT This study aimed to define management zones (MZs) for fertirrigated açaí cultivation, based on spatial variability of the foliar nutrients and productivity data. The work was carried out in an area of 5.75 ha of a 7-year crop, with 80 georeferenced sample points. Fresh fruit productivity and nutrient (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn) contents were determined. The average contents of macronutrients were considered adequate for adult açaí plants, and their spatial dependence associated with fruit productivity allowed the representation of their distributions through maps of variability. Through multivariate analysis, three main components were highlighted. These components explained 51.5 % of the total variability of the data, where PC1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Management zones; Multivariate analysis; Nutrient contents; Precision agriculture.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600800

Integrated multivariate analysis to evaluate effects of pre-slaughter handling on pork quality
Provedor de dados: 70
Autores: Machado,Sivanilza T.; Santos,Rodrigo C.; Caldara,Fabiana R.; Gonçalves,Manoel C.; Nääs,Irenilza de A.
The aim of this study was to investigate the effect of pre-slaughter handling on the occurrence of PSE (Pale, Soft, and Exudative) meat in swine slaughtered at a commercial slaughterhouse located in the metropolitan region of Dourados, Mato Grosso do Sul, Brazil. Based on the database (n=1,832 carcasses), it was possible to apply the integrated multivariate analysis for the purpose of identifying, among the selected variables, those of greatest relevance to this study. Results of the Principal Component Analysis showed that the first five components explained 89.28% of total variance. In the Factor Analysis, the first factor represented the thermal stress and fatiguing conditions for swine during pre-slaughter handling. In general, this study indicated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transport operation; Ambience; PSE meat; Multivariate analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300007

Management zones in agriculture acording to the soil and landscape variables
Provedor de dados: 70
Autores: Delalibera,Hevandro C.; Weirich Neto,Pedro H.; Nagata,Noemi.
The study of spatial variability of soil and plants attributes, or precision agriculture, a technique that aims the rational use of natural resources, is expanding commercially in Brazil. Nevertheless, there is a lack of mathematical analysis that supports the correlation of these independent variables and their interactions with the productivity, identifying scientific standards technologically applicable. The aim of this study was to identify patterns of soil variability according to the eleven physical and seven chemical indicators in an agricultural area. It was used two multivariate techniques: the hierarchical cluster analysis (HCA) and the principal component analysis (PCA). According to the HCA, the area was divided into five management zones: zone...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Precision agriculture; Spatial variability.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600021

The association of CAPN1 316 marker genotypes with growth and meat quality traits of steers finished on pasture
Provedor de dados: 74
Autores: Miquel,María C.; Villarreal,Edgardo; Mezzadra,Carlos; Melucci,Lilia; Soria,Liliana; Corva,Pablo; Schor,Alejandro.
The objective of this paper was to determine the association of a SNP in the µ-calpain gene at position 316 with growth and quality of meat traits of steers grown on pasture. Fifty-nine Brangus and 20 Angus steers were genotyped for CAPN1 316. Warner Bratzler shear force was measured in l. lumborum samples after a 7-day aging period. A multivariate analysis of variance was performed, including shear force (WBSF), final weight (FW), average daily gain (ADG), backfat thickness (BFT), average monthly fat thickness gain (AMFTG), rib-eye area (REA), and beef rib-eye depth (RED) as dependent variables. The CAPN1 316 genotype was statistically significant. Univariate analyses were done with these variables. The marker genotype was statistically significant (p...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Tenderness; Growth; Molecular marker; Multivariate analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300011

Morphological variation in a secondary contact between divergent lineages of brown trout (Salmo trutta) from the Iberian Peninsula
Provedor de dados: 74
Autores: Hermida,Miguel; San Miguel,Eduardo; Bouza,Carmen; Castro,Jaime; Martínez,Paulino.
The aim of this study was to analyze the morphological variation of brown trout (Salmo trutta) in the Duero basin, an Atlantic river basin in the Iberian Peninsula, where a spatial segregation of two divergent lineages was previously reported, based on isozyme, microsatellite and mtDNA data. In these studies, two divergent pure regions (Pisuerga and Lower-course) and several hybrid populations between them were identified. Morphological variation was evaluated in 11 populations representative of the genetic differentiation previously observed in the Duero basin, using multivariate analysis on 12 morphometric and 4 meristic traits. A large differentiation between populations was observed (interpopulation component of variance: 41.8%), similar to that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brown trout; Secondary contact; Morphometric; Meristic; Multivariate analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100007

Genetic divergence of rubber tree estimated by multivariate techniques and microsatellite markers
Provedor de dados: 74
Autores: Gouvêa,Lígia Regina Lima; Rubiano,Luciana Benchimol; Chioratto,Alisson Fernando; Zucchi,Maria Imaculada; Gonçalves,Paulo de Souza.
Genetic diversity of 60 Hevea genotypes, consisting of Asiatic, Amazonian, African and IAC clones, and pertaining to the genetic breeding program of the Agronomic Institute (IAC), Brazil, was estimated. Analyses were based on phenotypic multivariate parameters and microsatellites. Five agronomic descriptors were employed in multivariate procedures, such as Standard Euclidian Distance, Tocher clustering and principal component analysis. Genetic variability among the genotypes was estimated with 68 selected polymorphic SSRs, by way of Modified Rogers Genetic Distance and UPGMA clustering. Structure software in a Bayesian approach was used in discriminating among groups. Genetic diversity was estimated through Nei's statistics. The genotypes were clustered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genealogy; Genetic diversity; Hevea brasiliensis; Multivariate analysis; SSRs.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200018

Identification of common bean (Phaseolus vulgaris) duplicates using agromorphological and molecular data
Provedor de dados: 74
Autores: Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais; Dias,Luiz Antonio dos Santos; Moura,Rafaeli Ramos; Chiavegato,Marilia Barbosa; Colombo,Carlos Augusto.
We used agromorphological and random amplified polymorphic DNA (RAPD) molecular marker data to identify duplicate common bean (Phaseolus vulgaris L. Fabaceae) accessions in the Common Bean Germplasm Bank of the Agronomical Institute - IAC (Banco de Germoplasma de feijoeiro do Instituto Agronômico de Campinas (IAC), SP, Brazil). A total of 116 accessions with the same names and similar agromorphological traits was analyzed. The divergence between the accessions was initially evaluated by means of the agromorphological descriptors using single linkage clustering, from the Euclidean distance. Multivariate analysis identified four duplicate accessions (Carioca Lustroso, Bico de Ouro, Jamapa and Preto), with 17 other same-name accessions being suspected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Multivariate analysis; Germplasm banks; Descriptors.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100020

Comparison of similarity coefficients used for cluster analysis with dominant markers in maize (Zea mays L)
Provedor de dados: 74
Autores: Meyer,Andréia da Silva; Garcia,Antonio Augusto Franco; Souza,Anete Pereira de; Souza Jr.,Cláudio Lopes de.
The objective of this study was to evaluate whether different similarity coefficients used with dominant markers can influence the results of cluster analysis, using eighteen inbred lines of maize from two different populations, BR-105 and BR-106. These were analyzed by AFLP and RAPD markers and eight similarity coefficients were calculated: Jaccard, Sorensen-Dice, Anderberg, Ochiai, Simple-matching, Rogers and Tanimoto, Ochiai II and Russel and Rao. The similarity matrices obtained were compared by the Spearman correlation, cluster analysis with dendrograms (UPGMA, WPGMA, Single Linkage, Complete Linkage and Neighbour-Joining methods), the consensus fork index between all pairs of dendrograms, groups obtained through the Tocher optimization procedure and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic divergence; Heterotic groups; AFLP; RAPD; Multivariate analysis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100014

Combinations of distance measures and clustering algorithms in pepper germplasm characterization
Provedor de dados: 75
Autores: Gomes,Gisely Paula; Baba,Viviane Yumi; Santos,Odair P dos; Sudré,Cláudia P; Bento,Cintia dos S; Rodrigues,Rosana; Gonçalves,Leandro SA.
ABSTRACT Characterization and evaluation of genotypes conserved in the germplasm banks have become of great importance due to gradual loss of genetic variability and search for more adapted and productive genotypes. This can be obtained through several ways, generating quantitative and qualitative data. Joint analysis of those variables may be considered a strategy for an accurate germplasm characterization. In this study we aimed to evaluate different clustering techniques for characterization and evaluation of Capsicum spp. accessions using combinations of specific measures for quantitative and qualitative variables. A collection of 56 Capsicum spp. accessions was characterized based on 25 morphoagronomic descriptors. Six quantitative distances were used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum spp.; Multivariate analysis; Clustering methods; Genetic diversity; Qualitative and quantitative descriptors.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000200172

Genetic dissimilarity, selection index and correlation estimation in a melon germplasm
Provedor de dados: 75
Autores: Gomes,Danilo A; Alves,Igor M; Maciel,Gabriel M; Siquieroli,Ana Carolina S; Peixoto,Joicy Vitória M; Pires,Patrícia dos S; Medeiros,Iago A de.
ABSTRACT The success of breeding programs depends on genetic variability. Individuals selected based on a few traits may be a limitation. One alternative is the use of nonparametric indices. However, there is no information on the use of selection indices in melon germplasms. The present study aimed to estimate genetic dissimilarity in a melon germplasm and select potential parent plants for future breeding programs. The genetic material consisted of 37 melon accessions. The traits assessed were fruit diameter and length, diameter and length of the fruit cavity and total soluble solids. Genetic dissimilarity was assessed by multivariate analyses (UPGMA and Tocher). Selection gain estimates were analyzed by comparing the classic Smith-Hazel and sum of ranks...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Plant breeding; Multivariate analysis; Nonparametric indices; Selection gain.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100046

Distinctness, uniformity and stability and GT biplot tests for the selection of snap bean lines
Provedor de dados: 75
Autores: Sant’Anna,Camila QSS de; Oliveira,Tâmara Rebecca A de; Gravina,Geraldo de A; Cruz,Derivaldo P da; Gomes,Andrea BS; Daher,Rogério F; Vivas,Marcelo; Oliveira,Gustavo Hugo F de; Entringer,Geovana C; Coelho,Fábio C.
ABSTRACT The lack of records about snap bean cultivars is one of the obstacles that has led to a yield gap and low prominence of the crop. This work aimed at indicating snap bean lines obtained by the Breeding Program of the Universidade Estadual do Norte Fluminense (UENF) to assess their performance and to apply for a certificate of plant variety protection. The study was managed using a randomized block design with three replicates in a greenhouse at the Research Support Unit of the UENF. Nine candidate lines were compared to the commercial cultivar “Topseed Blue Line” in accordance with 56 descriptors set by the National Plant Variety Rights. All lines presented themselves as homogeneous. The L31 line provided a total of 30 different descriptors of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Multicategorical descriptors; Multivariate analysis; New technological products.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000400370

Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
Provedor de dados: 75
Autores: Oliveira,Izabela Regina C de; Rezende,Marcelo T; Dias,Carlos Tadeu dos S; Gomes,Daniela de S; Botrel,Élberis P; Gomes,Luiz Antônio A.
In many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Cover crop; Multivariate analysis; Organic production.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000300015

Variation of plant and fruit traits in native Mexican costeño pepper
Provedor de dados: 75
Autores: Santiago-Luna,Eric G; Carrillo-Rodríguez,José C; Chávez-Servia,José L; Perales-Segovia,Catarino; Heredia-Garcia,Elena.
ABSTRACT In a collection of costeño peppers conserved by indigenous producers from the municipalities of Santa Maria Tonameca and Santo Domingo de Morelos, Oaxaca, Mexico, a description and classification of agromorphological variation was undertaken by characterization of 46 populations in a greenhouse distributed under complete randomized block design with three replicates. Days to first flowering, plant and fruit traits and yield per plant were evaluated. Significant differences were detected for all traits except for plant height at 120 days after planting. In a principal component analysis, the variables of green and dry weight of 15 fruits, average fruit weight, number of fruits and yield per plant were the characteristics with major descriptive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Phenotypic diversity; Plant genetic resources; Characterization; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000300399

Genetic resources of vegetable crops: a survey in the Brazilian germplasm collections pictured through papers published in the journals of the Brazilian Society for Horticultural Science
Provedor de dados: 75
Autores: Sudré,Cláudia P; Leonardecz,Eduardo; Rodrigues,Rosana; Amaral Júnior,Antônio T do; Moura,Maria da CL; Gonçalves,Leandro SA.
The research on plant genetic resources is essential for the conservation of genetic diversity and accessions' divergence studies, as a basis for plant breeding. Aiming to know the state of art in this subject, a historical survey was carried out in Revista de Olericultura and in Horticultura Brasileira, from 1961 to 2006, searching for papers dealing with vegetable crops genetic resources. In each of the papers, the species studied, first author institution, publication year, applied software, number of accessions and descriptors, and the multivariate techniques used were registered. Based on these characteristics, papers were grouped using multivariate analysis. Sixty-one papers dealt somehow with genetic resources in the time covered by the survey, from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Review; Multivariate analysis; Diagnosis; Genetic diversity; Vegetables.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362007000400002

Многомерный анализ распределения бентосных диатомовых (Bacillariophyta) в поле градиентов абиотических факторов в Cевастопольской бухте (Черное море, Крым)
Provedor de dados: 13
Autores: Петров, А. Н.; Неврова, Е. Л.; Малахова, Л. В.
Проведен сравнительный анализ видовой структуры и количественного распределения бентосных диатомо­вых водорослей в многомерном пространстве градиентов абиотических переменных, определяющих эколо­гическую ситуацию в Севастопольской бухте. С использованием метода главных компонент и на основе рас­чета коэффициентов ранговой корреляции Спирмана (р) из исходных данных, включающих 26 физико-химических параметров, выделена комбинация из 7 абиотических факторов (глубина + фракция грунта 0,25∻0, 1мм+Cd+Eh+Mn+ПXБ+Zn), в наибольшей степени определяющих количественное распределение диатомовых в биотопе. По результатам кластерного анализа на основе сходства станций по 7 абиотическим факторам, все множество станций (32) было подразделено на три...
Tipo: Journal Contribution
Palavras-chave: Бентосные диатомовые; Bacillariophyta; Структура таксоцена; Многомерный статистический анализ; Антропогенное воздействие; Тяжелые металлы; Черное море; Benthic diatoms; Taxocene structure; Multivariate analysis; Technogenic pollution; Heavy metals; Black Sea.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/220

Análise gráfica biplot na seleção de genótipos de cajueiro.
Provedor de dados: 14
Autores: SERRANO, L. A. L.; MELO, D. S.; MAIA, M. C. C.; VIDAL NETO, F. das C.; BARROS, L. de M.; CRUZ, C. D.; OLIVEIRA, L. C. de; ARAÚJO, L. B. DE; MEDINA, L. M.; LIMA, P. S. da C.
As variáveis produtivas e de reação a pragas e doenças são os principais alvos do programa de melhoramento genético do cajueiro. O objetivo deste trabalho foi realizar uma seleção precoce em uma população segregante de cajueiro por meio da análise gráfica biplot para as variáveis de produção e reação à traça-da-castanha e ao oídio.
Tipo: Folhetos
Palavras-chave: Anacampsis phytomiella; Erysiphe quercicola; Análise multivariada; Anacardium Occidentale; Melhoramento Genético Vegetal; Caju; Anacardium; Cashew fruit; Genetic improvement; Multivariate analysis.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1150261

Technological profile of beef cattle farms in Brazilian biomes.
Provedor de dados: 14
Autores: FASIABEN, M. do C. R.; ALMEIDA, M. M. T. B.; MAIA, A. G.; OLIVEIRA, O. C. de; COSTA, F. P.; BARIONI, L. G.; DIAS, F. R. T.; MOREIRA, J. M. M. A. P.; SENA, A. L. dos S.; SANTOS, J. C. dos; LAMPERT, V. do N.; OLIVEIRA, P. P. A.; ABREU, U. G. P. de; GREGO, C. R.
Abstract - Beef production in Brazil is based on a great diversity of production systems. Despite the increasing in recent years, productivity is still low, giving space to technological intensification. The present study used special tabulations of Brazilian Census of Agriculture - 2006 to describe the predominant beef cattle systems, with emphasis on technological variables. Factor analysis and clustering techniques were used together, by biome, covering a universe of 124 thousand farms, 94 million heads of cattle and 86 million hectares of pasture. The results highlight the productivity differences among regions and farms, outlining the farm profiles per biome. Such results can be helpful to support research and technologies transfer, as well as public...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Bioma; Análise multivariada; Análise fatorial; Análise de cluster; Produção de bovinos; Tipificação de municípios; Sistemas de produção; Tipologia de fazendas; Factorial analysis; Farms and Farming Systems; Farming systems; Farm typology; Multivariate analysis; Cluster analysis.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1127930

Análise de correspondência - uma ferramenta útil na comparação de mapas de produtividade.
Provedor de dados: 14
Autores: CARVALHO, J. R. P. de; VIEIRA, S. R.; MORAN, R. C. C. P.
O objetivo deste trabalho é apresentar a análise de correspondência como um método estatístico multivariado que pode ajudar na comparação de mapas de produtividade.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Análise de correspondência; Mapa de produtividade; Krigagem; Variabilidade temporal; Variabilidade espacial; Análise multivariada; Yield mapping; Kriging; Variability; Multivariate analysis.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/7817

Aplicativo para análise de componentes principais.
Provedor de dados: 14
Autores: PALUMBO, F. V. P.; CARVALHO, J. R. P. de; MOURA, M. F.
Análise por componentes principais. Entrada de dados para o aplicativo: Procedimento. Opções do aplicativo. Especificação de algoritmos: Descrição de método. Cálculo usando a matriz de variâncias e covariâncias(S). Cálculo usando a matriz de correlação (R). Cálculo usando a Matriz Parcial.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Algoritmos; Software NTIA; Análise de componentes principais; Análise multivariada; Algorithms; Computer software; Principal component analysis; Multivariate analysis.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/6923

Predição de características bromatológicas em Arachis pintoi Krap &amp; Greg. via espectroscopia de reflectância do infravermelho próximo.
Provedor de dados: 14
Autores: ATHAYDE, N. B.; MEDEIROS, E. P. de; FONSECA, C. E. L. da; ASSIS, G. M. L. de.
Objetivou-se verificar a efetividade da espectroscopia no infravermelho próximo e calibração multivariada para a predição de características bromatológicas do amendoim forrageiro (Arachis pintoi Krap &amp; Greg.). Amostras de diferentes origens genéticas, anos e épocas de colheita foram usadas para leituras espectrais e análises de referência. Para o desenvolvimento das regressões por quadrados mínimos parciais (PLS) utilizaram-se 206 amostras como conjunto de calibração e 103 como conjunto de validação externa. Como os ajustes das calibrações iniciais foram de moderados a baixos, uma nova etapa foi feita com 462 amostras para calibração e 231 para validação externa. Outras 231 amostras foram utilizadas para uma segunda validação dos modelos. As...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Amendoim forrageiro; Forage peanut; Cacahuetes forrajeros; Leguminosas forrajeras; Fitomejoramiento; Espectroscopia de reflectância no infravermelho próximo (NIRS); Espectroscopía del infrarrojo cercano; PLS; Manejo de pasto; Análise multivariada; Análisis de multivarianza; Características bromatológicas; Bromatological traits; Leguminosa Forrageira; Pastagem; Manejo; Recuperação do Solo; Melhoramento Genético Vegetal; Método Estatístico; Forage legumes; Arachis pintoi; Plant breeding; Pasture management; Multivariate analysis; Near-infrared spectroscopy.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1126405

Abordagens e metodologias para avaliação de germoplasma.
Provedor de dados: 14
Autores: MOREIRA, J. de A. N.; SANTOS, J. W. dos; OLIVEIRA, S. R. de M.
Abordagens e metodologias para avaliação de germoplasmas; Análise dos componentes principais; Abordagens e metodologias para avaliacao de germoplasma. Principais abordagens. Metodologias adotadas. Analise dos componentes principais. Desenvolvimento da metodologia. Analise das coordenatas principais. Desenvolvimento da metodologia. Análise de agrupamento. Medidas de similaridade. Distância de mahalanobis. Coeficiente simples de emparelhamento. Coeficiente de jaccard. Distância de rogers. Métodos de agrupamento. Métodos aglomerativos. Métodos do vizinho mais próximo. Método do vizinho mais distante. Método de otimização. Método de tocher. Metodologias para o estudo da diversidade genética. Índice de shannon e weaver. Análise da diversidade genética de nei....
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Análise multivariada; Germoplasma; Germplasm; Multivariate analysis.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/111580

Agricultura de precisão em fruticultura.
Provedor de dados: 14
Autores: BASSOI, L. H.; MIELE, A.; REISSER JUNIOR, C.; GEBLER, L.; FLORES, C. A.; FILIPPINI ALBA, J. M.; GREGO, C. R.; TERRA, V. S. S.; TIMM, L. C.; NASCIMENTO, P. dos S.
Os sistemas de produção atualmente existentes na fruticultura brasileira caracterizam-se pela execução de diversas práticas agrícolas durante o ciclo da cultura, tendo como preocupação a quantidade e a qualidade da produção, e a rentabilidade da atividade agrícola. Nesse contexto, cria-se uma oportunidade para a aplicação de agricultura de precisão, como forma de auxiliar a gestão do sistema de produção e a tomada de decisão pelo produtor. Nesse capítulo, são apresentados quatro estudos de caso em que a realização de procedimentos e o uso de ferramentas, característicos de agricultura de precisão, permitem aos produtores e técnicos a compreensão da variabilidade de atributos do solo e da planta e de suas relações, bem como o estabelecimento de zonas...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Geoestatística; Análise multivariada; Agricultura de precisao; Fruticultura; Viticultura; Estatística agrícola; Método estatístico; Maçã; Pêssego; Uva; Precision agriculture; Fruit growing; Viticulture; Geostatistics; Agricultural statistics; Multivariate analysis.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008274

Diversity and dynamics of rare and of resident bacterial populations in coastal sands
Provedor de dados: 5
Autores: Gobet, Angelique; Boeer, Simone I.; Huse, Susan M.; Van Beusekom, Justus E. E.; Quince, Christopher; Sogin, Mitchell L.; Boetius, Antje; Ramette, Alban.
Coastal sands filter and accumulate organic and inorganic materials from the terrestrial and marine environment, and thus provide a high diversity of microbial niches. Sands of temperate climate zones represent a temporally and spatially highly dynamic marine environment characterized by strong physical mixing and seasonal variation. Yet little is known about the temporal fluctuations of resident and rare members of bacterial communities in this environment. By combining community fingerprinting via pyrosequencing of ribosomal genes with the characterization of multiple environmental parameters, we disentangled the effects of seasonality, environmental heterogeneity, sediment depth and biogeochemical gradients on the fluctuations of bacterial communities...
Tipo: Text
Palavras-chave: 454 pyrosequencing; Coastal seas; Bacterial diversity; Multivariate analysis; Rare biosphere.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00488/59947/63192.pdf

Regional metier definition: a comparative investigation of statistical methods using a workflow applied to international otter trawl fisheries in the North Sea
Provedor de dados: 5
Autores: Deporte, Nicolas; Ulrich, Clara; Mahevas, Stephanie; Demaneche, Sebastien; Bastardie, Francois.
The European Common Fisheries Policy recognizes the importance of accounting for heterogeneity in fishing practices, and metier-based sampling is now at the core of the EU Data Collection Framework. The implementation of such an approach would require Member States to agree on the standard regional metier definitions and on practical rules to categorize logbook records into metiers. Several alternative approaches have been used in the past to categorize landings profiles, but no consensus has yet emerged. A generic open-source workflow is developed to test and compare a selection of methods, including principal components analysis (PCA), hierarchical agglomerative clustering (HAC), K-means, and Clustering LARge Applications (CLARA), and to provide simple...
Tipo: Text
Palavras-chave: Cluster; Data Collection Framework (DCF); Logbooks; Mtier; Mixed fisheries; Multivariate analysis; North Sea.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00071/18225/15841.pdf

Temporal changes in the phytoplankton community along the French coast of the eastern English Channel and the southern Bight of the North Sea
Provedor de dados: 5
Autores: Hernandez- Farinas, Tania; Soudant, Dominique; Barille, Laurent; Belin, Catherine; Lefebvre, Alain; Bacher, Cedric.
Long-term trends in the phytoplankton community along the French coast of the English Channel and southern Bight of the North Sea were studied and related to physico-chemical factors and large-climatic indices. Phytoplankton and hydrological data were acquired through three transects. Sampling took place between 1992 and 2011 as part of the French Phytoplankton Monitoring Network (REPHY) and the Regional Nutrients Monitoring Network (SRN). Trends in time-series were identified with dynamic linear models tailored to environmental monitoring data characteristics (e.g. irregular sampling frequency, missing data). Temporal and spatial patterns in the phytoplankton community were explained with a partial triadic analysis. Relationships between the phytoplankton...
Tipo: Text
Palavras-chave: Climatic indicators; Dynamic linear model; Environmental drivers; Multivariate analysis; Phytoplankton.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00195/30619/32177.pdf

Environmental controlling factors of copepod communities in the Gulf of Tunis (south western Mediterranean Sea)
Provedor de dados: 5
Autores: Ben Lamine, Yosra; Pringault, Olivier; Aissi, Mehdi; Ensibi, Cherif; Mahmoudi, Ezzeddine; Kefi, Ons Daly Yahia; Yahia, Mohamed Nejib Daly.
The copepod community structure and the distribution of the main groups of zooplankton were studied along an inshore-offshore gradient in the Gulf of Tunis during the rainy and dry seasons of 2007-2008. Hydrological parameters were also measured to assess the potential role of abiotic and biotic factors in the distribution of copepod species. The copepod community in the Gulf of Tunis comprises 86 species dominated by Paracalanus parvus, Clausocalanus lividus, Centropages kroyeri and Acartia clausi. Time had a greater influence than space (horizontal and vertical gradients) in shaping the copepod community structure with a significant influence of the seasons; winter (cold and rainy) resulted in hydrological conditions that were strongly different from...
Tipo: Text
Palavras-chave: Copepod diversity; Multivariate analysis; Temperature; Salinity; Top-down control; Competition.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00275/38670/73416.pdf

Evaluation, scénarios et viabilité écologique et économique des pêcheries côtières tropicales : application au cas de la Guyane Française
Provedor de dados: 5
Autores: Cisse, Abdoul.
The need for an integrated approach to fisheries is now widely affirmed, including the FAO, in particular in the context of tropical artisanal fisheries. These small-scale fisheries, often multispecies are very important in terms of production, employment and food security. However these fisheries and the exploited resources are often characterized by a lack of data making difficult their management within an ecosystem approach, and by the ecological and economic system complexities including trophic and technological interactions. This thesis aims to contribute to the development of bioeconomic tools for small tropical fisheries in a sustainable management perspective based on the ecosystem approach. In this perspective, the French Guiana coastal fishery...
Tipo: Text
Palavras-chave: Pêcherie tropicale à petite échelle; Multi-flottilles; Multispécifique; Approche ecosystémique; Analyse multivariée; Intéractions trophiques; Modélisation bioéconomique; Indicateurs bioéconomiques; Analyse de viabilité; Stochasticité; Théorie des jeux.; Tropical small-scale fishery; Multi-fleet; Multi-species; Ecosystem approach; Multivariate analysis; Trophic interactions; Bioeconomic modeling; Bio-indicators; Sustainability analysis; Stochasticity; Game theory.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00144/25492/23646.pdf

Typologie biosédimentaire de la baie de Saint-Brieuc (Manche ouest), et estimation de la biomasse des catégories trophiques macrozoobenthiques.
Provedor de dados: 5
Autores: Gros, Philippe; Hamon, Dominique.
The aim of this report is to provide biomass estimates (AFDW, g.m-2 ) of the four main components of the benthic food web in the southern part of the Bay of St-Brieuc: suspension-feeders, deposit-feeders, herbivores and carnivores. Patterns in the environmental data (i.e., sedimentary characters) are first analysed, and then related to the spatial distribution of communities ; both approaches use classical ordination techniques (PCA, correspondence analysis). A second typology, based on a review of published litterature concerning coastal macrozoobenthos feeding, ascribes each taxonomic unit to a trophic group. Finally, quantitative results are thus given per biota ; suspension-feeders appear to dominate (in terms of biomass) most of fine-sand habitats of...
Tipo: Text
Palavras-chave: Zoobenthos; Réseau trophique; Analyses multivariables; Manche ouest; Zoobenthos; Food web; Multivariate analysis; Western Channel.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00107/21794/19371.pdf

Relationships between growth, survival, physiology and behaviour — A multi-criteria approach to Haliotis tuberculata phenotypic traits
Provedor de dados: 5
Autores: Lachambre, Sebastien; Huchette, Sylvain; Day, Rob; Boudry, Pierre; Rio-cabello, Antoine; Fustec, Timothee; Roussel, Sabine.
Abalone growth rate is often identified among important traits to improve through selective breeding. However, the rapid success of some selective breeding plans has sometimes led to negative effects in some aquaculture species due to trade-offs. One of them is the loss of homeostasis of selected animals which results in the inability to resist the stress experienced during the rearing process. In this context, this study aimed to analyze the phenotypic relationships between growth, and physiological and behavioural traits in Haliotis tuberculata under stressful conditions. Eleven traits related to growth, immunity, reproduction and behaviour were recorded under laboratory conditions. A total of 120 adults from wild or farm origin were first monitored...
Tipo: Text
Palavras-chave: Haliotis tuberculata; Growth; Behaviour; Physiology; Multivariate analysis; Phenotyping.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00333/44434/44101.pdf

Bionomie benthique subtidale en Baie de Douarnenez
Provedor de dados: 5
Autores: Blanchet, Aline; Chevalier, Claire; Gaffet, Jean-dominique; Hamon, Dominique.
Following a preliminary mapping survey using a combination of acoustic techniques, spatial patterns of sedimentologic and biological characteristics of the Bay of Douarnenez were studied in 2001 from a series of grab samples and underwater video recording aiming at calibrate the acoustic facies of the bottom and at characterized them from a biological point of view. Results obtained from community structure analysis showed that four principal ecological groups dominate : The coarse sands community with Branchiostoma lanceolatum, Glycymeris glycymeris and Glycera lapidum, the fine to medium sand community with Nephtys cirrosa, Ophelia borealis and Gastrosaccus spinifer, the mixed muddy sand and gravel community with Amphiura filiformis, Edwardsia sp. and...
Tipo: Text
Palavras-chave: Cartographie; Peuplements; Baie de Douamenez; Zoo-benthos; Analyses multivariées; Vidéo; Échinodermes.; Cartography; Comrnunities; Bay of Douamenez; Zoo-benthos; Multivariate analysis; Video; Echinodermata.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00431/54254/56103.pdf

Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters
Provedor de dados: 5
Autores: Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text
Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf

Typologie de l'activité de Pêche en Guadeloupe
Provedor de dados: 5
Autores: Maguer, Cedric; Reynal, Lionel; Taquet, Marc.
This work aims to describe fishing activity in Guadeloupe through a typology. The samply unit y is the landing represented by a profile of specific composition. Using multivariate analysis methods allows to synthesize this fishing multi specises and multi fishing tackles. Principal Component Analysis and classification regroup landings. Then, segmentation method separateses classes by species composition. Typology is obtained by association of classes and tackles. The contraist between landings of reef fishes realized with traps and those which search for pelagics is clearly shown. Landings of queen conch and landings without fishes are separated in two classes.
Tipo: Text
Palavras-chave: Typologie; Guadeloupe; Analyse multivariée; Typology; Guadeloupe; Multivariate analysis.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00113/22408/20105.pdf

Induced spawning of red drum, Sciaenops ocellatus: use of multivariate and univariate analysis methods in the search for side effects of LH-RHa treatments and ovarian development state upon spawn quality
Provedor de dados: 5
Autores: Gardes, Lionel; Villanove, Philippe; Buchet, Vincent; Fauvel, Christian.
The present work examines the usefulness of the combination of multivariate analyses and further one-way analysis of variance in the search for links between causes and effects in heterologous stimulation of spawning in fish. Stimulations with both 20 and 50 mu g . kg(-1) doses of [D Trp(6)] luteinizing hormone-releasing hormone analogue (LH-RHa) were effective in inducing and synchronizing spawning of red drum, Sciaenops ocellatus. Oocyte development monitoring using ovarian biopsy allowed treatment injections at different stages of maturation. The influence at stimulation time of female oocyte development state upon further development was shown. An interesting potential of second stimulation, leading to high quality spawns, was established and factors...
Tipo: Text
Palavras-chave: Pisciculture; Induction de la ponte; LH-RH analogues; Analyse multivariée; Qualité des oeufs; Développement ovocytaire; Ombrine; Sciaenops ocellatus; Fish culture; Induced breeding; LH-RH analogues; Multivariate analysis; Egg quality; Oocyte development; Red drum; Sciaenops ocellatus.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00187/29875/28361.pdf

Analyse des flottilles du sud du golfe de Gascogne, de 1986 à 2002 – De Noirmoutier à Bayonne. Description et évolution des composantes de pêche
Provedor de dados: 5
Autores: Leaute, Jean-pierre.
This document presents a comparative assessment of six triennal analysis carried out between 1986 and 2002, on 1300 boats, on average, from the 35 ports of Southern Bay of Biscay fishing fleets (from Loire river to Spanish border). Fisheries statistics allow the identification of different fishing practices and fishing boats associated with them within the fleets. In order to allow comparison and analysis of the evolution that has taken place during the study period, the same variables (gears used, landed species) and multivariate analysis procedures have been used to produce groupings of vessels.   Over the period, 11 components, on average, have been identified, grouped in two entities, mobile and fixed gears. If the discriminative characteristics...
Tipo: Text
Palavras-chave: Typologie; Flottilles de pêche; Composantes; Golfe de Gascogne; Analyse multivariée; Typology; Fishing fleet; Components; Bay of Biscay; Multivariate analysis.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00001/11234/7756.pdf

BIGORNO. Biodiversité Intertidale sud Gascogne Observation et Recherche de Nouveaux Outils de surveillance et d'aide à la décision - Rapport fiinal
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lalanne, Yann; Huguenin, Laura; Marticorena, Julien; Lissardy, Muriel; Bru, Noelle; D'Amico, Franck; Liquet, Benoît.
This report presents the results obtained during the BIGORNO project whose main objective is to overcome knowledge gaps on the biocenoses of the southern sub-region "Bay of Biscay" to propose a sampling protocol adapted to biogeographic and environmental specific conditions. A stratified random sampling design considering spatial heterogeneity has been implemented. Biodiversity was considered on 0.1 m²quadrats. These data have revealed the organization of benthic communities and the relevant taxa to be considered (species or assemblages of indicator species) in the context of establishing perennial monitoring of intertidal habitats. Proposals are made to implement the descriptors and indicators defined in the Marine Strategy Framework Directive (MSFD).
Tipo: Text
Palavras-chave: Côte basque; Estran rocheux; Microhabitats; Espèces indicatrices; Analyses multivariées; DCSMM; Basque coast; Intertidal rocky shore; Microhabitat; Indicator species; Multivariate analysis; MFSD.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00371/48229/48893.pdf

Assessing Alternative Microscopy-Based Approaches to Species Abundance Description of Intertidal Diatom Communities
Provedor de dados: 5
Autores: Ribeiro, Lourenço; Brotas, Vanda; Hernandez Farinas, Tania; Jesus, Bruno; Barille, Laurent.
Diatoms usually dominate microphytobenthic biofilms in coastal and estuarine intertidal environments. Yet, functional studies on biofilms often skip species analysis because benthic diatoms are notoriously difficult to extract from sediments and challenging to identify at that taxonomic level. Valid, less time-consuming alternatives would surely be welcomed and increase the inclusion of community structure information in microphytobenthos (MPB) ecophysiological studies. Starting with an original 181-species abundances matrix (OSM), obtained during a 2-year spatial–temporal survey in a Tagus Estuary intertidal flat with contrasting sediment textures, the current study assessed the effectiveness of several approaches to species abundances analysis. The...
Tipo: Text
Palavras-chave: Diatoms; Community structure; Intertidal flats; Microphytobenthos; Multivariate analysis; Taxonomic sufficiency.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00610/72187/70963.pdf

Typologie de la flottille chalutière du port de Sète par une méthode de segmentation
Provedor de dados: 5
Autores: Taquet, Marc; Gaertner, Jean-claude; Bertrand, Jacques.
This work aims to define a typology of trawler f1eet in Sète, the main fishing harbour along the French Mediterranean coast, using several multivariate analysis methods. The fishing ships taken to account are represented by annual profiles of landing specific compositions. Five fishing strategies have been identified. A segmentation method using symbolic objects allows a formaI characterisation of the different strategies. These strategies are studied according to several general characteristics usually used for management rules elaboration (power, length, ship age). The typological analysis allows to characterise two main exploitation ways, one directed to the catch of a few species (Engraulis encrasicolus, Sardina pilchardus), the other characterised by...
Tipo: Text
Palavras-chave: Flotille; Stratégie; Chalutage; Analyse multivariée; Méditerranée; Fleet; Strategy; Fish trawling; Multivariate analysis; Mediterranean sea.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00113/22404/20101.pdf

A three-dimensional view on biodiversity changes: spatial, temporal, and functional perspectives on fish communities in the Baltic Sea
Provedor de dados: 5
Autores: Frelat, Romain; Orio, Alessandro; Casini, Michele; Lehmann, Andreas; Merigot, Bastien; Otto, Saskia A.; Sguotti, Camilla; Moellmann, Christian.
Fisheries and marine ecosystem-based management requires a holistic understanding of the dynamics of fish communities and their responses to changes in environmental conditions. Environmental conditions can simultaneously shape the spatial distribution and the temporal dynamics of a population, which together can trigger changes in the functional structure of communities. Here, we developed a comprehensive framework based on complementary multivariate statistical methodologies to simultaneously investigate the effects of environmental conditions on the spatial, temporal and functional dynamics of species assemblages. The framework is tested using survey data collected during more than 4000 fisheries hauls over the Baltic Sea between 2001 and 2016. The...
Tipo: Text
Palavras-chave: Baltic Sea; Demersal fish community; Functional traits; Multivariate analysis; Spatio-temporal dynamics; Species distribution.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00475/58659/62410.pdf

Morphometric Differentiation of Two Nigerian Fish Species (Oreochromis niloticus and Lates niloticus) Using Principal Components and Discriminant Analysis
Provedor de dados: 77
Autores: Yakubu,A; Okunsebor,S. A.
Morphological differences between two close fish populations were investigated in Doma Dam, north central Nigeria using principal component and discriminant analyses. The purpose was to identify the two species correctly and assign them into distinct genetic groups. To achieve this, seven morphometric measurements (body weight, standard length, total length, head length, body depth, dorsal fin length and caudal fin length) were made on each of the studied 252 fish specimens (153 Oreochromis niloticus and 99 Lates niloticus). The analysis of variance showed that significantly (P&lt;0.05) higher values were recorded for Lates niloticus in all the body traits examined, except dorsal fin length. From the principal component analysis, the differences between...
Tipo: Journal article
Palavras-chave: Fish; Genotypes; Conservation; Morphological traits; Multivariate analysis; Nigeria.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400060

A multivariate approach to explore the genetic variability in the F2 segregating population of a tomato second cycle hybrid
Provedor de dados: 46
Autores: Cabodevila,V.G; Picardi,L.A; Pratta,G.R.
Segregating progeny from the tomato Second Cycle Hybrids (SCH) that were obtained from crossing RIL (Recombinant Inbred Lines) allows the detection of new genetic combinations that could increase genetic variability in F2 populations. The objectives of the present study were to evaluate eleven tomato quality traits in a segregating F2 population obtained from a SCH and, then, to characterize the molecular diversity by six AFLP (Amplified Fragment Length Polymorphism) primer combinations. Different multivariate analyses were used to assess the degree of concordance among these two approaches to detect genetic variability. Sixty-nine F2 plants were obtained by selfing the SCH (ToUNR18xToUNR1). The parental RIL were derived from an interspecific cross between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant breeding; Plant genetic resources; Fruit quality; AFLP; Multivariate analysis.
Ano: 2017
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332017000100001

A taxonomic revision of Actinidiaceae of Vietnam
Provedor de dados: 16
Autores: Cuong, N.M.; Soejarto, D.D.; Li, J.
Taxonomic study of morphological variability using multivariate analysis, together with field studies and literature review clarified the status of a number of paired species of Saurauia and Actinidia of Vietnam and resolved their correct nomenclature: Saurauia tristyla is different from S. roxburghii; Saurauia petelotii is not a synonym of S. fasciculata but is a separate species; Actinidia tonkinensis is a synonym of A. latifolia; Actinidia indochinensis is a distinct species, not a variety of A. callosa; Saurauia dillenioides is a synonym of S. armata; and Saurauia griffithii var. annamica is a synonym of S. napaulensis. Four taxa of Actinidia are newly recorded for Vietnam. The results of this study will allow us to better understand the conservation...
Tipo: Article / Letter to the editor
Palavras-chave: Actinidiaceae; Actinidia; Saurauia; Vietnam; Multivariate analysis; Taxonomy.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/525211

Sponge diversity and community composition in Irish bathyal coral reefs
Provedor de dados: 16
Autores: Soest, R.W.M van; Cleary, D.F.R.; Kluijver, M.J. de; Lavaleye, M.S.S.; Maier, C.; Duy, F.C. van.
Sponge diversity and community composition in bathyal cold water coral reefs (CWRs) were examined at 500-900 m depth on the southeastern slopes of Rockall Bank and the northwestern slope of Porcupine Bank, to the west of Ireland in 2004 and 2005 with boxcores. A total of 104 boxcore samples, supplemented with 10 trawl/dredge attempts, were analyzed for the presence and abundance of sponges, using microscopical examination of (sub)samples of collected coral branches, and semi-quantitative macroscopic examination. Approximate minimum size of identified and counted sponge individuals was 1 mm. Literature data were added to the Porcupine Bank results to compensate for a less intensive sampling program in that location. Species richness and abundance were...
Tipo: Article / Letter to the editor
Palavras-chave: Coldwater; Multivariate analysis; North Atlantic; Ordination; PCA; Porifera; RDA; 42.72.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/226534

Castes in the neotropical social wasp Leipomeles dorsata (Fabricius) (Hymenoptera: Vespidae): a window for workers achieving a new status in the colony
Provedor de dados: 82
Autores: Noll,Fernando B; Gomes,Bruno; Lima,Alexandre C O; Mateus,Sidnei; Wenzel,John W.
Morphometric studies performed in several species of Neotropical social wasps from the tribe Epiponini showed that in some species there are marked differences between castes, while other species present highly distinct castes with differences only in ovarian development. This work analyzed females from six colonies of the social wasp Leipomeles dorsata (Fabricius) in which queens (egglayers) and workers showed differences in ovarian development and coloration. We propose that wasps with developed ovaries (egglayers) and coloration similar to those of workers are possibly intermediates that obtained the status of queens in the colony.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiponini; Caste difference; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400013

Integrity of fluvial fish communities is subject to environmental gradients in mountain streams, Sierra de Aroa, north Caribbean coast, Venezuela
Provedor de dados: 83
Autores: Rodríguez-Olarte,Douglas; Amaro,Ahyran; Coronel,Jorge; Taphorn B.,Donald C.
We examined physical habitat and fish assemblages in rivers of the Aroa Mountains (Venezuela) with different levels of environmental protection due to the creation of Yurubí National Park within the drainage. We developed an Index of Biotic Integrity (IBI) and evaluated it using principal components analysis (PCA) and canonical correspondence analysis (CCA). Tributary rivers were divided into classes according to their origin (protected by the park) and physical characteristics of each, including substrate. Fishes were captured using standardized electrofishing. Fish communities showed greater species richness in heterogeneous habitat and protected rivers but overall abundance was higher in unprotected and impacted rivers. The IBI was sensitive to these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Index of Biotic Integrity; Habitat characterization; Multivariate analysis; National Park.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000300003

Optimización de una red de estaciones marinas para monitoreo en una bahía de bolsa
Provedor de dados: 20
Autores: Arencibia, G.; Capetillo, N.; Castro, M.; Ortega, A.
Las redes de estaciones de monitoreo o muestreos empleadas en estudios ambientales dentro de amplios ecosistemas marinos, como extensas bahías de bolsa, ocasionan enormes gastos económicos y de tiempo en las campañas de muestreo, además de imprecisiones estadísticas que no las hacen representativas. En este trabajo se emplean una serie de criterios que dan basamento para la recomendación de una nueva red de estaciones a partir de estudios previos de metales pesados, hidrocarburos, pesticidas y del bentos, los cuales permiten elaborar una red de monitoreo óptima. Se tuvieron en cuenta criterios diferentes y pruebas estadísticas de análisis multivariado. La red propuesta para estudios de indicadores biológicos del bentos y contaminantes en sedimentos queda...
Tipo: Journal Contribution
Palavras-chave: Multivariate analysis; Sediments; Benthos; Heavy metals; Hydrocarbon analysis; Pesticides.
Ano: 2011
URL: http://hdl.handle.net/1834/4649

Les analyses statistiques multivariées : application sur deux espèces de Soleidea des cotes Tunisiennes
Provedor de dados: 20
Autores: Glid, A.; Mosbah, S.; Ghorbel, M.; Bradai, M.N.
Une analyse statistique multivariée a été entreprise sur la base de 11 caractères métriques et 10 caractères méristiques de 3 échantillons de Soleidae appartenant à 2 espèces différentes en provenance de 3 localités distinctes : S. aegyptiaca de Sfax et de Djerba et S. senegalensis de Bizerte. Cette étude a montré une différence significative de certains caractères entre les deux espèces d’une part et au sein de la même espèce péchée dans 2 localités différentes. Le recours aux fonctions canoniques a permis d’élaborer des équations pouvant classer un échantillon dans l’espèce adéquate et dans la localité de sa capture. Une étude complémentaire intégrant toutes les espèces de cette famille, morphologiquement très semblable, pourrait être une méthodologie de...
Tipo: Journal Contribution
Palavras-chave: Animal morphology; Fishery regulations; Fishing rights; Meristic counts; Multivariate analysis; Statistical analysis; Taxonomy; Variance analysis; Fishery policies.
Ano: 2009
URL: http://hdl.handle.net/1834/4488

Comparación mediante el empleo de los caracteres merísticos y el crecimiento de caballas originarias de varias regiones geográficas (Cataluña, Islas Canarias y Sudamerica)
Provedor de dados: 20
Autores: Perrotta, R.G.
Mackerel from SW Atlantic (22° -39°S) and the coast of Cataluña (42° 30'N) were compared by analizing both morphometric and meristic characters. A multivariate analysis, i.e. principal components was used. The growth curves corresponding to mackerels from different regions (Canarias, North of Chile, Mar del Plata and Rincón in Argentine) were also compared, as well as the mean length at ages 1 and 2 (Mar del Plata- Cataluña, Rincón- Cataluña). Significant differences in the growth were found between two groups. The first group was integrated by three SW Atlantic population (Brasil, Mar del Plata, Rincón), which possible conform a subspecies of Scomber japonicus. The second one was represented by the coastal mackerel off Cataluña.
Tipo: Journal Contribution
Palavras-chave: Morphometry; Meristic counts; Growth; Multivariate analysis; Growth; Multivariate analysis; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_28921.
Ano: 1993
URL: http://hdl.handle.net/1834/2570

Asociación bentónicas en bancos de vieira patagónica (Zygochlamys patagonica) en el Mar Argentino
Provedor de dados: 20
Autores: Schejter, L.
The different aspects of the benthic assemblages at the Patagonian scallop beds in the Argentine Sea (SW Atlantic) were studied. The Patagonian scallop (Zygochlamys patagonica) is a commercial species distributed in the Magellanic Biogeographic Province, and has been commercially exploited since 1996. Temporal and spatial studies were performed in the community composition between 39°50'S and 36°15'S, and between 1998 and 2003, concluding that the species association was persistent after more than 7 years of trawling activities. Species composition in an exclusion area (closed to scallop fishing) did not differ from surrounding fished areas during the studied period, showing only a higher scallop biomass. ABC curves showed a pattern coincident with a non...
Tipo: Theses and Dissertations
Palavras-chave: Zoobenthos; Community composition; Long-term changes; Short-term changes; Species diversity; Fishing grounds; Epibionts; Scallop fisheries; Multivariate analysis; Multivariate analysis; Zoobenthos; Species diversity; Fishing grounds.
Ano: 2005
URL: http://hdl.handle.net/1834/3917

Classification of estuarine particles using automated electron microprobe analysis and multivariate techniques
Provedor de dados: 27
Autores: Bernard, P.C.; Van Grieken, R.E.
The suspended particulate matter from a series of stations in an estuary is automatically analyzed for 11 elements on a particle-by-particle basis by using electron microprobe X-ray microanalysis and an automatic image analysis system. The interpretation of the large acquired data set implies numerical multivariate analysis. The developed procedure consists of using cluster analysis on the particles of individual samples, followed by nearest centroid sorting over all samples from the study area. For the Ems estuary, the procedure provided 13 geochemically different particle types of which the relative abundance through the estuary could be followed and interpreted in terms of estuarine mixing processes. The presented methodology could be applied in other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuarine chemistry; Multivariate analysis; Suspended particulate matter.
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3219

Interference of sample size on multicollinearity diagnosis in path analysis
Provedor de dados: 86
Autores: Sari,Bruno Giacomini; Lúcio,Alessandro Dal’Col; Olivoto,Tiago; Krysczun,Dionatan Ketzer; Tischler,André Luís; Drebes,Lucas.
Abstract: The objective of this work was to evaluate the interference of sample size on multicollinearity diagnosis in path analysis. From the analyses of productive traits of cherry tomato, two Pearson correlation matrices were obtained, one with severe multicollinearity and the other with weak multicollinearity. Sixty-six sample sizes were designed, and from the amplitude of the bootstrap confidence interval, it was observed that sample size interfered on multicollinearity diagnosis. When sample size was small, the imprecision of the diagnostic criteria estimates interfered with multicollinearity diagnosis in the matrix with weak multicollinearity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Bootstrapping; Multivariate analysis; Sampling.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600769

Genetic diversity in table grapes based on RAPD and microsatellite markers
Provedor de dados: 86
Autores: Leão,Patrícia Coelho de Souza; Motoike,Sérgio Yoshimitsu.
The objective of this work was to analyze the genetic diversity of 47 table grape accessions, from the grapevine germplasm bank of Embrapa Semiárido, using 20 RAPD and seven microsatellite markers. Genetic distances between pairs of accessions were obtained based on Jaccard's similarity index for RAPD data and on the arithmetic complement of the weighted index for microsatellite data. The groups were formed according to the Tocher's cluster analysis and to the unweighted pair‑group method with arithmetic mean (UPGMA). The microsatellite markers were more efficient than the RAPD ones in the identification of genetic relationships. Information on the genetic distance, based on molecular characteristics and coupled with the cultivar agronomic performance,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Cluster analysis; Genetic divergence; Grapevine; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000900010

Genetic variability in conilon coffee related to grain attributes in an irrigated crop in the Cerrado
Provedor de dados: 86
Autores: Brige,Felipe Augusto Alves; Celestino,Sonia Maria Costa; Amabile,Renato Fernando; Fagioli,Marcelo; Delvico,Francisco Marcos dos Santos; Montalvão,Ana Paula Leite; Sala,Pedro Ivo Aquino Leite.
Abstract: The objective of this work was to quantify the genetic variability of 213 conilon coffee accessions of the Robusta Tropical cultivar, based on chemical characteristics related to the quality of green coffee beans, as well as to identify promising accessions for the breeding program of irrigated conilon coffee in the Brazilian Cerrado. The chemical characteristics evaluated were: protein and caffeine contents, total soluble solids and total lipids, ether extract, pH, and total titratable acidity. The data were subjected to the principal component analysis and cluster analysis based on the similarities observed within the first two principal components using the minimum variance method (Wards) and, as a measure of similarity, the Euclidean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Chemical composition; Genetic diversity; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102804

Divergence and genetic variability among superior rubber tree genotypes
Provedor de dados: 86
Autores: Gouvêa,Lígia Regina Lima; Chiorato,Alisson Fernando; Gonçalves,Paulo de Souza.
The objective of this work was to estimate the genetic variability and divergence among 22 superior rubber tree (Hevea sp.) genotypes of the IAC 400 series. Univariate and multivariate analyses were performed using eight quantitative traits (descriptors), including yield. In the univariate analyses, the estimated parameters were: genetic and environmental variances; genetic and environmental coefficients of variation; and the variation index. The Mahalanobis generalized distance, the Tocher agglomerative method and canonical variables were used for the multivariate analyses. In the univariate analyses, variability was verified among the genotypes for all the variables evaluated. The Tocher method grouped the genotypes into 11 clusters of dissimilarity. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Crossbreeding; Multivariate analysis; Selection.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000200007

Morphoagronomic and molecular characterization of ornamental passion fruit cultivars
Provedor de dados: 86
Autores: Fonseca,Kenia Gracielle da; Faleiro,Fábio Gelape; Junqueira,Nilton Tadeu Vilela; Barth,Mariana; Feldberg,Nelson Pires.
Abstract: The objective of this work was to validate the morphoagronomic descriptors used in the protection processes of plant cultivars in Brazil, by characterizing six cultivars of ornamental passion fruit. The BRS Rubiflora, BRS Rosea Púrpura, BRS Céu do Cerrado, BRS Roseflora, BRS Estrela do Cerrado, and BRS Pérola do Cerrado cultivars, 33 morphoagronomic descriptors, and two molecular markers were used. The categorical morphoagronomic descriptors were analyzed by frequency distribution and multivariate analyses. The quantitative morphoagronomic descriptors were subjected to the analysis of variance and to the comparison of the means of each cultivar. The random amplified polymorphic DNA (RAPD) and the inter-simple sequence repeats (ISSR) markers were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora; Molecular markers; Multivariate analysis; Plant cultivar protection.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001000849

Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Inês meat sheep
Provedor de dados: 86
Autores: Oliveira,Elisa Junqueira; Savegnago,Rodrigo Pelicioni; Freitas,Luara Afonso de; Freitas,Anielly Paula; Maia,Suellen Rodrigues; Simili,Flávia Fernanda; Faro,Lenira El; Costa,Ricardo Lopes Dias da; Santana Júnior,Mário Luiz; Paz,Claudia Cristina Paro de.
Abstract: The objective of this work was to estimate genetic parameters for traits related to resistance to endoparasites in Santa Inês sheep, for a possible inclusion in sheep breeding programs, as well as to evaluate the additive genetic pattern of the animals using cluster analyzes, in order to assess whether there are groups within the population that can be used as candidates for selection for resistance to endoparasites. The studied traits were: Famacha score, fecal egg counts (FEC), packed cell volume (PCV), total plasma protein (TPP), body condition score (BCS), and body weight (BW). Heritability estimates ranged from 0.17 (0.05) for TPP to 0.31 (0.07) for BCS. The cluster analyzes based on the breeding values identified four clusters. Famacha and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Famacha; Genetic correlation; Heritability; K-means; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201338

Classification and fingerprinting of different berries based on biochemical profiling and antioxidant capacity
Provedor de dados: 86
Autores: Milivojević,Jasminka; Rakonjac,Vera; Akšić,Milica Fotirić; Pristov,Jelena Bogdanović; Maksimović,Vuk.
The objective of this work was to evaluate the biochemical composition of six berry types belonging to Fragaria, Rubus, Vaccinium and Ribes genus. Fruit samples were collected in triplicate (50 fruit each) from 18 different species or cultivars of the mentioned genera, during three years (2008 to 2010). Content of individual sugars, organic acids, flavonols, and phenolic acids were determined by high performance liquid chromatography (HPLC) analysis, while total phenolics (TPC) and total antioxidant capacity (TAC), by using spectrophotometry. Principal component analysis (PCA) and hierarchical cluster analysis (CA) were performed to evaluate the differences in fruit biochemical profile. The highest contents of bioactive components were found in Ribes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactive compounds; Metabolite fingerprinting; Multivariate analysis; Nutraceuticals; Small fruits.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000900013

Statistical models for evaluating the genotype-environment interaction in maize (Zea mays L.)
Provedor de dados: 85
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

Weed Flora of Citrus Orchards and Factors Affecting its Distribution in Western Mediterranean Region of Turkey
Provedor de dados: 87
Autores: ONEN,H.; AKDENIZ,M.; FAROOQ,S.; HUSSAIN,M.; OZASLAN,C.
ABSTRACT: Citrus is an important export commodity, mostly grown on Mediterranean and Aegean coasts of Turkey. Weeds are hidden foes impairing citrus productivity. Limited knowledge of weed distribution and factors affecting the distribution are among major hurdles in successful weed management. In this study, weed flora of citrus orchards and factors affecting its distributions in Mugla province of Turkey were determined. Sixty orchards were surveyed in spring and autumn seasons of 2010 and 2011. Data relating to frequency, coverage and density of weed species were recorded. Soil samples (0-30 cm depth) were collected and analyzed for physicochemical properties. Climatic variables, altitude and soil properties were correlated with weed flora. Sixty-eight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Multivariate analysis; Soil properties; Weather.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100236

ATRIBUTOS CONSIDERADOS IMPORTANTES NA DECISÃO DE COMPRA DOS COMPRADORES DE CARNE SUÍNA EM BELO HORIZONTE-MG
Provedor de dados: 31
Autores: Truocchio,   Tania Batista Ribeiro; Antonialli,   Luiz Marcelo.
O objetivo da presente pesquisa foi identificar os atributos considerados importantes na decisão de compra dos compradores de carne suína em Belo Horizonte-MG. Quanto à metodologia, trata-se de uma pesquisa de natureza quantitativa cujos dados foram coletados por meio de um levantamento do tipo survey aplicando-se um questionário estruturado em uma amostra de 399 compradores de carne suína em Belo Horizonte-MG. Utilizou-se para análise dos dados técnicas de estatística descritiva e multivariada (análise de cluster, análise discriminante e análise de variância) por meio do software SPSS (Statistical Package for the Social Sciences). Como conclusões da pesquisa destaca-se que os compradores de carne suína estão mais exigentes quanto à aparência, qualidade e...
Tipo: Conference Paper or Presentation
Palavras-chave: Carne de suínos; Comportamento de compra; Análise multivariada; Meat of pork; Purchasing behavior; Multivariate analysis; Food Consumption/Nutrition/Food Safety; Livestock Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/108602

Structuring Consumer Preferences with the SEM Method
Provedor de dados: 31
Autores: Rosa,   Franco.
Structuring preferences has been developed with econometric models using functional flexible parametric form and the exploring the perceptions about expressed and latent needs using different multivariate approaches. Purpose of this research is to explore the demand for a new drink using the mean-end chain (MEC) theory and multivariate SEM procedure. The first part is dedicated to description of specialty foods for their capacity to create new niche markets. The MEC theory is introduced to explain the relations between attributes and consumers' perceptions of secondary needs revealed as benefit and values. The second part is dedicated to the empirical investigation of demand of a drink obtained from the "Olivello spinoso" a spontaneous plant. Empirical...
Tipo: Conference Paper or Presentation
Palavras-chave: Demand; Mean-End Chain; Multivariate analysis; Specialty products; Niche market; Customer satisfaction; SEM; Consumer/Household Economics.
Ano: 2002
URL: http://purl.umn.edu/24966

Multifunctional agriculture: an analysis of country specialization and regional differentiation
Provedor de dados: 31
Autores: Pierangeli,   Fabio; Henke,   Roberto; Coronas,   M.G.
Member States acknowledge the multifunctional role of the primary sector; however each of them emphasises specific functions according to its own model of agriculture and rural development. As a result, the CAP and the demand of citizens addressing a new role of the primary sector in post-industrial society have contributed to develop a specialisation of multifunctionality at the EU level that is more and more visible moving from an aggregated territorial level (Member Stares) toward a local one (regions). The objective of this paper is to analyse the specialization towards the secondary functions of agriculture at two different territorial and institutional levels: the national level (EU-25) and the regional level (in Italy), with the support of a...
Tipo: Conference Paper or Presentation
Palavras-chave: Multifunctionality; Territorial specialization; Multivariate analysis; Agricultural and Food Policy.
Ano: 2008
URL: http://purl.umn.edu/44244

CARACTERIZAÇÃO DO PERFIL DA APICULTURA EM CAPÃO BONITO E ADJACÊNCIAS
Provedor de dados: 31
Autores: Fachini,   Cristina; Firetti,   Ricardo; Oliveira,   Eduardo Cardoso De; Carvalho,   Antonio Assiz De Filho.
O Sudoeste Paulista é a segunda maior região do Estado em importância para a apicultura tendo totalizado em 2006 o valor de produção de R$ 3.052.402 com 17.135 colméias. Em 2006 os “produtores de mel” de Capão Bonito existiam “produtores de mel” que tinham a apicultura como principal fonte de renda até agricultores familiares que tinham a produção de mel como mais uma alternativa de renda. Tais características se traduziam em sistemas de produção com diferentes níveis tecnológicos e, portanto, custos de produção também diferenciados. O presente estudo teve como objetivo caracterizar profundamente o perfil dos produtores apícolas em Capão Bonito e adjacências segundo características sócio-econômicas e o nível tecnológico de produção. Foram aplicados 25...
Tipo: Conference Paper or Presentation
Palavras-chave: Apicultura; Nível tecnológico; Análise multivariada; Beekeeping; Technology level; Multivariate analysis; Livestock Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/114170

Multivariate methods in aquaculture research: case studies of tilapias in experimental and commercial systems
Provedor de dados: 31
This volume documents the usefulness of multivariate methods û notably multiple regression, path analysis and canonical correlation û in the context of aquaculture, which has to date tended to neglect such methods, and hence to underutilize available data. All examples used here stem from experimental and/or commercial tilapia culture systems, and hence this book also represents an advance in the understanding of such systems.
Tipo: Report
Palavras-chave: Aquaculture; Tilapia culture; Growth; Multivariate analysis; Farm Management.
Ano: 1993
URL: http://purl.umn.edu/44727

USING MULTIVARIATE RANK SUM TESTS TO EVALUATE EFFECTIVENESS OF COMPUTER APPLICATIONS IN TEACHING BUSINESS STATISTICS
Provedor de dados: 31
Autores: Su,   Yeong-Tzay; Liang,   Chyi-Lyi (Kathleen).
Arguments about using computer facilities to classroom teaching have gained a lot of attention over time.  Using the computer facilities will be helpful to demonstrate real world applications, while poor data or inappropriate case studies might reduce the confidence in applying computer programs in classroom teaching.  In this article we examine the results of using computer facilities to teach Business statistics to a group of Management students sampled from Krannert School of Management, Purdue University.  This study shows that students are attracted to the interactive computer programs designed for the Business Statistics course, and students are more motivated to attend classes when using computer facilities are applied in teaching.  Furthermore,...
Tipo: Conference Paper or Presentation
Palavras-chave: Rank sum test; Multivariate analysis; Teaching evaluation; Computer applications; Business statistics; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 1999
URL: http://purl.umn.edu/21707

Horizontal and vertical tree community structure in a lowland atlantic rain forest, southeastern Brazil
Provedor de dados: 88
Autores: Guilherme,Frederico Augusto G.; Morellato,L. Patrícia C.; Assis,Marco A.
The horizontal and vertical tree community structure in a lowland Atlantic Rain Forest was investigated through a phytosociological survey in two 0.99 ha plots in the Intervales State Park, São Paulo State. All trees &gt; 5 cm diameter at breast height were recorded. 3,078 individuals belonging to 172 species were identified and recorded. The Shannon diversity index was H' = 3.85 nat.ind.-1. The Myrtaceae family showed the greatest floristic richness (38 species) and the highest density (745 individuals) in the stand. Euterpe edulis Mart. had the highest importance value (33.98%) accounting for 21.8% of all individuals recorded. The quantitative similarity index was higher than the qualitative index, showing little structural variation between plots....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Multivariate analysis; Phytosociology; Tree stratification; Tropical forest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400012

Variabilidade intra-específica em cinco populações de Oncidium varicosum Lindl. (Orchidaceae -- Oncidiinae) em Minas Gerais
Provedor de dados: 88
Autores: CARDIM,DARUSKA CAVALCANTE; CARLINI-GARCIA,LUCIANA APARECIDA; MONDIN,MATEUS; MARTINS,MARINA; VEASEY,ELIZABETH ANN; ANDO,AKIHIKO.
Com o objetivo de estudar a variabilidade genética intra-específica em Oncidium varicosum Lindl. (Orchidaceae - Oncidiinae), foram avaliadas cinco populações de Minas Gerais, coletadas em Alfenas (AL), Estiva (ES), Pedra do Coração (PC), Pedra Branca (PB) e Pouso Alegre (PA). Foram considerados 22 caracteres florais, medidos a partir de "vouchers" (fichas florais), empregando-se métodos estatísticos univariados e multivariados (análise discriminante canônica - CDA e análise de agrupamento a partir de distância de Mahalanobis). Houve diferença significativa (p &lt; 0,05) entre populações, pelo teste F, para 13 caracteres. O primeiro eixo canônico separou a população PA de PB e de PC. Os indivíduos de PA são menores que os de PC, que são menores que os de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orchidaceae; Oncidium varicosum; Morphometric analysis; Genetic variability; Multivariate analysis.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500010

A contribution to the phytogeography of Brazilian campos: an analysis based on Poaceae
Provedor de dados: 88
Autores: Garcia,Ricardo José Francischetti; Longhi-Wagner,Hilda Maria; Pirani,José Rubens; Meirelles,Sérgio Tadeu.
Twenty areas from eight Brazilian states were compared according to a list of 224 species of Poaceae. In order to determinate affinity patterns between the areas, a binary matrix was submitted to cluster and ordination analysis. The patterns found were then faced to climate and geographic position. The scores corresponding to the areas obtained from the cluster analysis showed a strong correlation to temperature. The scores corresponding to the species suggest a gradient that associates distribution patterns to the photosynthetic pathway (C3 or C4). The current results suggest that the traditional classification of the Southern American grasslands might require some modification in order to be broadly applicable in the Brazilian context.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian grasslands; Gramineae; Multivariate analysis; South America.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000400009

Influência do solo e topografia sobre as variações da composição florística e estrutura da comunidade arbóreo-arbustiva de uma floresta estacional semidecidual em Ingaí, MG
Provedor de dados: 88
Autores: BOTREL,REJANE T.; OLIVEIRA FILHO,ARY T.; RODRIGUES,LUCIENE A.; CURI,NILTON.
Foi realizado um levantamento da comunidade arbóreo-arbustiva, da topografia e dos solos de um fragmento de floresta estacional semidecidual com o objetivo de verificar as possíveis correlações entre variações da estrutura fisionômica e composição de espécies e variações do regime de água e fertilidade química dos solos. O fragmento florestal, com área de 17 ha, localiza-se às margens do rio Ingaí (21º24' S e 44º55' W), no município de Ingaí, MG. Foram realizados um levantamento plani-altimétrico da área e uma classificação detalhada dos solos da floresta. Foram alocadas 25 parcelas de 20 × 20 m para amostrar os indivíduos arbóreo-arbustivos com diâmetro à altura do peito (DAP)  &gt; ou =  5 cm. Amostras do solo superficial (0-20 cm de profundidade) foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical semideciduous forest; Riverine forest; Community of trees and shrubs; Multivariate analysis; Soil-vegetation relationship.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200008

Morphometric analysis of the Brasiliorchis picta complex (Orchidaceae)
Provedor de dados: 88
Autores: Pinheiro,Fábio; Barros,Fábio de.
One of the largest genera of Orchidaceae in the Neotropics with about 450 species, Maxillaria presents several taxonomic uncertainties about its generic circumscription and the delimitation of species groups, mainly due to the large variability of some species. The present study aims at verifying the morphological variation and species delimitation in the Brasiliorchis picta complex, a recent new genus derived from Maxillaria, using morphometric multivariate analysis. A total of 340 specimens belonging to six species (B. chrysantha (Barb. Rodr.) R.B. Singer, S. Koehler &amp;amp; Carnevali, B. gracilis (Lodd.) R.B. Singer, S. Koehler &amp;amp; Carnevali, B. marginata (Lindl.) R.B. Singer, S. Koehler &amp;amp; Carnevali, B. picta (Hook.) R. Singer, S....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometry; Multivariate analysis; Species complex; Taxonomy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000100003

Characterization of soil chemical properties of strawberry fields using principal component analysis
Provedor de dados: 90
Autores: Islabão,Gláucia Oliveira; Pinto,Marília Alves Brito; Selau,Lisiane Priscila Roldão; Vahl,Ledemar Carlos; Timm,Luís Carlos.
One of the largest strawberry-producing municipalities of Rio Grande do Sul (RS) is Turuçu, in the South of the State. The strawberry production system adopted by farmers is similar to that used in other regions in Brazil and in the world. The main difference is related to the soil management, which can change the soil chemical properties during the strawberry cycle. This study had the objective of assessing the spatial and temporal distribution of soil fertility parameters using principal component analysis (PCA). Soil sampling was based on topography, dividing the field in three thirds: upper, middle and lower. From each of these thirds, five soil samples were randomly collected in the 0-0.20 m layer, to form a composite sample for each third. Four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa Duch; Soil fertility; Multivariate analysis; Temporal variability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100017

Evaluation of ammonia volatilization losses by adjusted parameters of a logistic function
Provedor de dados: 90
Autores: Vale,Marcos Lima Campos do; Sousa,Rogério Oliveira de; Scivittaro,Walkyria Bueno.
The dynamics of N losses in fertilizer by ammonia volatilization is affected by several factors, making investigation of these dynamics more complex. Moreover, some features of the behavior of the variable can lead to deviation from normal distribution, making the main commonly adopted statistical strategies inadequate for data analysis. Thus, the purpose of this study was to evaluate the patterns of cumulative N losses from urea through ammonia volatilization in order to find a more adequate and detailed way of assessing the behavior of the variable. For that reason, changes in patterns of ammonia volatilization losses as a result of applying different combinations of two soil classes [Planossolo and Chernossolo (Typic Albaqualf and Vertic Argiaquolls)]...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Soil; Multivariate analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100022

Pedological Heterogeneity of Soils Developed from Lithologies of the Pirambóia, Sanga-do-Cabral, and Guará Geological Formations in Southern Brazil
Provedor de dados: 90
Autores: Santos,Pablo Grahl dos; Almeida,Jaime Antonio de; Sequinatto,Letícia; Miquelluti,David José.
ABSTRACT The source material is one of the factors that most influence soil genesis and the mainly responsible for the nature, composition, and behavior of the soil. Given the geological complexity of the Santa Maria River basin, the objective of this study was to investigate whether the new lithologies described recently may be responsible for a greater variation in soil properties, as well as in the soil taxonomy itself. The study area is located in the municipality of Rosário do Sul, RS, Brazil at 30° 15’ 28” S and 54° 54’ 50” W, with average altitude of 132 m and climate type Cfa. This study was supported by a cartographic base composed of topographic charts, geological maps, satellite images, digital elevation models, and maps of geomorphometric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lithology; Topolithosequence; Geomorphic surfaces; Soil properties; Multivariate analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100310

Physical quality of an Oxisol under an integrated crop-livestock-forest system in the Brazilian Cerrado
Provedor de dados: 90
Autores: Sousa Neto,Eurico Lucas de; Andrioli,Itamar; Almeida,Roberto Giolo de; Macedo,Manuel Cláudio Mota; Lal,Rattan.
Soil physical quality is an important factor for the sustainability of agricultural systems. Thus, the aim of this study was to evaluate soil physical properties and soil organic carbon in a Typic Acrudox under an integrated crop-livestock-forest system. The experiment was carried out in Mato Grosso do Sul, Brazil. Treatments consisted of seven systems: integrated crop-livestock-forest, with 357 trees ha-1 and pasture height of 30 cm (CLF357-30); integrated crop-livestock-forest with 357 trees ha-1 and pasture height of 45 cm (CLF357-45); integrated crop-livestock-forest with 227 trees ha-1 and pasture height of 30 cm (CLF227-30); integrated crop-livestock-forest with 227 trees ha-1 and pasture height of 45 cm (CLF227-45); integrated crop-livestock with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroforestry; Soil organic carbon; Multivariate analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200025

Soil Macrofauna as a Soil Quality Indicator in Native and replanted Araucaria angustifolia Forests
Provedor de dados: 90
Autores: Pereira,Jamil de Morais; Segat,Julia Corá; Baretta,Dilmar; Vasconcellos,Rafael Leandro de Figueiredo; Baretta,Carolina Riviera Duarte Maluche; Cardoso,Elke Jurandy Bran Nogueira.
ABSTRACT Studies on soil quality in Araucaria forests contribute to understanding changes in this ecosystem and serve as a tool in conserving its biodiversity. The aim of this study was to evaluate the potential of soil macrofauna in discriminating native and replanted Araucaria forests for selection of soil quality indicators. Native (NF) and replanted (RF) Araucaria angustifolia forests were evaluated in three regions of the state of São Paulo, representing three true replications. Fifteen soil samples were collected in each area for evaluation of the physical, chemical, and microbiological properties and the macrofauna through use of monolith excavation and the manual screening method [Tropical Soil Biology and Fertility (TSBF) method]. In addition, we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Biodiversity; Bioindicators.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100423

Relationships between microbial activity and soil physical and chemical properties in native and reforested Araucaria angustifolia forests in the state of São Paulo, Brazil
Provedor de dados: 90
Autores: Pereira,Jamil de Morais; Baretta,Dilmar; Bini,Daniel; Vasconcellos,Rafael L. de F.; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia (Bert.) O. Kuntze is the main component of the Mixed Ombrophilous forest and, in the State of São Paulo, it is associated with a high diversity of soil organisms, essential for the maintenance of soil quality, making the conservation of this ecosystem a major and pressing challenge. The objective of this study was to identify the physical and chemical properties that are most closely correlated with dehydrogenase enzyme activity, basal respiration and microbial biomass under native (NF) and replanted (RF) Araucaria angustifolia forests in three regions of the state of São Paulo, in winter and summer. The main differentiating factors between the areas were also determined. Each forest was represented by three true replications; at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Soil quality; Soil chemical properties; Microbiological properties.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300003

Hierarchical and optimization methods for the characterization of tomato genotypes
Provedor de dados: 91
Autores: Peixoto,Joicy V. M.; Almeida,Rafaela S. de; Rocha,Jaine P. R. da; Maciel,Gabriel M.; Santos,Nádya C.; Pereira,Lucas M.
ABSTRACT The correct characterization of germplasm banks is fundamental for breeders to succeed in breeding programs. Several studies have sought to obtain genotypes with resistance to pests. However, there is no consensus about which methodology is the most appropriate to characterize a germplasm bank of tomato with different levels of resistance to pests. The objective of this study was to compare methods of multivariate analysis for the evaluation of genetic diversity in tomato genotypes with different levels of resistance to pests. The experiments were conducted at the Vegetable Experimental Station of the Federal University of Uberlândia - Monte Carmelo campus (18º 42’ 43.19” South latitude and 47º 29’ 55.8” West longitude, 873 m altitude), in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomato; Insect resistance; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100027

Principal components analysis for quality evaluation of cooled banana 'Nanicão' in different packing
Provedor de dados: 94
Autores: Sanches,Juliana; Leal,Paulo Ademar Martins; Saravali,José Henrique; Antoniali,Silvia.
This work aims determinate the evaluation of the quality of 'Nanicão' banana, submitted to two conditions of storage temperature and three different kinds of package, using the technique of the Analysis of Principal Components (ACP), as a basis for an Analysis of Variance. The fruits used were 'Nanicão' bananas, at ripening degree 3, that is, more green than yellow. The packages tested were: "Torito" wood boxes, load capacity: 18 kg; "½ box" wood boxes, load capacity: 13 kg; and cardboard boxes, load capacity: 18 kg. The temperatures assessed were: room temperature (control); and (13±1ºC), with humidity controlled to 90±2,5%. Fruits were discarded when a sensory analysis determined they had become unfit for consumption. Peel coloration, percentages of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa cavendishii; Quality; Multivariate analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452003000200009

Genetic diversity of a brazilian wine grape germplasm collection based on morphoagronomic traits
Provedor de dados: 94
Autores: Leão,Patrícia Coelho de S.; Cruz,Cosme Damião; Motoike,Sérgio Y.
The objectives of this study were to evaluate the performance of cultivars, to quantify the variability and to estimate the genetic distances of 66 wine grape accessions in the Grape Germplasm Bank of the EMBRAPA Semi-Arid, in Juazeiro, BA, Brazil, through the characterization of discrete and continuous phenotypic variables. Multivariate statistics, such as, principal components, Tocher's optimization procedure, and the graphic of the distance, were efficient in grouping more similar genotypes, according to their phenotypic characteristics. There was no agreement in the formation of groups between continuous and discrete morpho-agronomic traits, when Tocher's optimization procedure was used. Discrete variables allowed the separation of Vitis vinifera and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germplasm; Grapevine; Grape cultivars; Vitis spp.; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452010000400026

MORPHOLOGICAL TRAITS AS TOOL TO VERIFY GENETIC VARIABILITY OF INTERSPECIFIC DRAGON FRUIT HYBRIDS
Provedor de dados: 94
Autores: SILVA,ADRIANA DE CASTRO CORREIA DA; SABIÃO,RAFAEL ROVERI; CHIAMOLERA,FERNANDO MARCELO; SEGANTINI,DANIELA MOTA; MARTINS,ANTONIO BALDO GERALDO.
ABSTRACT  With recent cultivation in Brazil, the dragon fruit still have lacks related to the selection of promising materials and there are not yet commercial varieties in the country. Therefore, manual pollination cross were held in 2010, between plants of H. undatus x H. polyrhizus and H. undatus x H. setaceus. Aiming evaluate the genetic diversity of the progenies for future use in breeding program, based on cladodes characteristics, six characters were assessed: length and diameter of stem, distance between areoles, arch height, number and size of spines/areole. From the Euclidean distance matrix analysis was constructed a dendrogram by the UPGMA method. There was great variability among hybrids, and eight of them have shown promise for use in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic relationship; Multivariate analysis; Hylocereus undatus; H. polyrhizus; H. setaceus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000100802

GENETIC AND MORPHOAGRONOMIC DIVERSITY OF Passiflora spp. BASED ON QUANTITATIVE MEASUREMENTS OF FLOWERS AND FRUITS
Provedor de dados: 94
Autores: OLIVEIRA,JAMILE DA SILVA; FALEIRO,FÁBIO GELAPE; JUNQUEIRA,NILTON TADEU VILELA; VIANA,MARCELO LIBINDO.
ABSTRACT  The aim of this study was to characterize Passiflora spp. accessions and its genetic diversity based on quantitative morphological descriptors of flowers and fruits. The study was conducted at Embrapa Cerrados, Planaltina-DF. Fifteen Passiflora spp. accessions were characterized using 14 quantitative morphological descriptors. Genetic distances among accessions were estimated based on Mahalanobis’ generalized distance. Cluster analysis via dendrogram and graphic dispersion was analyzed. The relative contribution of characters for accession divergence was also calculated. The morphoagronomic characterization based on quantitative descriptors of flowers and fruits contributed to the differentiation of Passiflora spp. accessions, serving as an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Passifloraceae; Genetic resources.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000100801

Diversity and genetic relatedness among genotypes of Vitis spp. using microsatellite molecular markers
Provedor de dados: 94
Autores: Leão,Patrícia Coelho de Souza; Cruz,Cosme Damião; Motoike,Sérgio Yoshimitsu.
The purpose of this research was to study the genetic diversity and genetic relatedness of 60 genotypes of grapevines derived from the Germplasm Bank of Embrapa Semiárido, Juazeiro, BA, Brazil. Seven previously characterized microsatellite markers were used: VVS2, VVMD5, VVMD7, VVMD27, VVMD3, ssrVrZAG79 and ssrVrZAG62. The expected heterozygosity (He) and polymorphic information content (PIC) were calculated, and the cluster analysis were processed to generate a dendrogram using the algorithm UPGMA. The He ranged from 81.8% to 88.1%, with a mean of 84.8%. The loci VrZAG79 and VVMD7 were the most informative, with a PIC of 87 and 86%, respectively, while VrZAG62 was the least informative, with a PIC value of 80%. Cluster analysis by UPGMA method allowed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grape; Multivariate analysis; Genealogy; SSR.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000300017

O teor de cálcio na casca é indicativo da suscetibilidade ao "bitter pit" em maçãs 'fuji'
Provedor de dados: 94
Autores: Amarante,Cassandro Vidal Talamini do; Ernani,Paulo Roberto; Steffens,Cristiano André; Argenta,Luiz Carlos.
Este trabalho objetivou identificar os atributos minerais na casca e na polpa, relacionados à severidade de "bitter pit" em maçãs 'Fuji'. Os frutos foram colhidos em pomar comercial do município de Lages-SC, e armazenados durante quatro meses em câmara fria convencional (0±0,4°C e 90-95% de umidade relativa). Posteriormente, foram separadas em quatro lotes, de acordo com a severidade de "bitter pit": nula (0 lesão/fruto), baixa (1-2 lesões/fruto), moderada (3-4 lesões/fruto) e alta (5-16 lesões/fruto), com 15 frutos (repetições) em cada nível de severidade. Os frutos de cada lote foram analisados individualmente quanto aos teores de Ca, Mg, K e N, na casca e na polpa. Na análise univariada dos teores minerais da polpa, observou-se aumento nos níveis de K e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Fruit quality; Mineral nutrition; Physiological disorder; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000100023

Genetic diversity of bushy cashew (Anacardium humile A. St.-Hil.) based on characteristics of fruits
Provedor de dados: 94
Autores: Pereira,Laísse Danielle; Silva,Danielle Fabíola Pereira da; Souza,Lásara Kamila Ferreira de; Pereira,Erick Tiago Lino; Assunção,Hildeu Ferreira da; Costa,Marcelo Marques.
Abstract  Knowledge of the genetic variability among genotypes of bushy cashew is important to establish strategies for pre-breeding and use in breeding program. The objective of this study was to evaluate the genetic diversity of bushy cashew by means of the evaluation of physical, chemical and physicochemical characteristics of cashew apples and cashew nuts. The work was carried out with cashew nuts and cashew apples collected in the harvest of 2016 of genotypes in the “ex situ” biological collection of Anacardium humile A. St.-Hil. in the area of genetic resources of the Universidade Federal de Goiás - Regional Jataí. The results were submitted to descriptive analysis and multivariate analysis, estimating the mean Euclidean distance obtained from the...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Anacardiaceae; Germoplasm bank; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000500804

HETEROTIC GROUP FORMATION IN PSIDIUM GUAJAVA L. BY ARTIFICIAL NEURAL NETWORK AND DISCRIMINANT ANALYSIS
Provedor de dados: 94
Autores: CAMPOS,BIANCA MACHADO; VIANA,ALEXANDRE PIO; QUINTAL,SILVANA SILVA RED; BARBOSA,CIBELLE DEGEL; DAHER,ROGÉRIO FIGUEIREDO.
ABSTRACT  The present study aimed at evaluating the heterotic group formation in guava based on quantitative descriptors and using artificial neural network (ANN). For such, we evaluated eight quantitative descriptors. Large genetic variability was found for the eight quantitative traits in the 138 genotypes of guava. The artificial neural network technique determined that the optimal number of groups was three. The grouping consistency was determined by linear discriminant analysis, which obtained classification percentage of the groups, with a value of 86 %. It was concluded that the artificial neural network method is effective to detect genetic divergence and heterotic group formation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guava; Genetic variability; Multivariate analysis; Heterotic group.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000100151

The taxonomic status of Myotis levis levis and Myotis levis dinellii (Mammalia: Chiroptera: Vespertilionidae)
Provedor de dados: 103
Autores: Miranda,João M. D.; Bernardi,Itiberê P.; Sponchiado,Jonas; Passos,Fernando C.
Investigating the Myotis levis complex is important for understanding the taxonomic status of the two subspecies currently recognized in it: Myotis levis levis (I. Geoffroy, 1824) and M. levis dinellii Thomas, 1902. Both M. levis levis and M. levis dinellii have been recently observed in sympatry in Argentina. This finding suggests that these populations might in fact correspond to distinct species rather than subspecies, as they have traditionally been designated. By using a multivariate morphometric approach, we demonstrate that M. l. levis has secondary sexual dimorphism in several measurements, with females being larger than males; sexual dimorphism was not detected in M. levis dinellii. However, we found morphometric differences between the two taxa....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometric; Multivariate analysis; Neotropical Myotis; Southern South America.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000500007

Status taxonômico e distribucional do complexo Eumops bonariensis (Chiroptera: Molossidae) no sul do Brasil
Provedor de dados: 103
Autores: Bernardi,Itiberê P.; Miranda,João M. D.; Passos,Fernando C.
The taxonomic status and the geographical distribution of the specimens from southern Brazil previously identified as members of the Eumops bonariensis (Peters, 1874) species complex are here reviewed based on specimens deposited in collections of the states of Paraná and Rio Grande do Sul. The results of an investigation of diagnostic morphological characters and a multivariate morphometrics analysis suggest the recognition of two forms, E. bonariensis and E. patagonicus Thomas, 1924, thus altering considerably the distributional scenario of these forms in southern Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Morphology; Morphometrics; Multivariate analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100025

Genetic diversity of a Paspalum notatum Flügge germplasm collection
Provedor de dados: 96
Autores: Fachinetto,Juliana Maria; Dall'Agnol,Miguel; Souza,Cleber Henrique Lopes de; Weiler,Roberto Luis; Simioni,Carine.
ABSTRACT The objective of this study was to assess the genetic diversity among accessions of Paspalum notatum based on morphological marker traits and identify those morphological traits that contribute most to the variability among accessions. Fifty-three accessions were evaluated for the following traits: length, width, color, and pubescence of sheath; length, width, insertion angle, color of midrib, and pubescence of leaves; number, length, and angle of racemes; length of flowering stems; and plant growth habit (erect or prostrate). Multivariate analysis of the quantitative morphological data based on the Mahalanobis distance and UPGMA method grouped the accessions into 19 heterogeneous clusters. The relative contribution of each trait to cluster...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage grass; Genetic improvement; Multivariate analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000900714

Multivariate relationship among body protein, fat, and macrominerals of male and female Saanen goats using canonical correlation analysis
Provedor de dados: 96
Autores: Vargas,Julián Andrés Castillo; Almeida,Amélia Katiane; Härter,Carla Joice; Souza,Anaiane Pereira; Fernandes,Márcia Helena Machado da Rocha; Resende,Kléber Tomás de; Teixeira,Izabelle Auxiliadora Molina de Almeida.
ABSTRACT The objective of this study was to investigate the multivariate relationship among body protein, fat, and macrominerals in Saanen goats of different sexes (castrated males, females, and intact males) using canonical correlation analysis. Individual records of 274 Saanen goats combined from 10 studies was used. Two sets of body constituents were established: the first one contained variables related to body protein or fat (canonical variate U) and the second contained variables related to body calcium, phosphorus, magnesium, sodium, or potassium (canonical variate V). Two canonical pairs were identified for each sex. However, irrespective of sex, first canonical pairs accounted for more than 87% of variance of the dependent variables, these only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy goat; Multivariate analysis; Sex; Tissue composition.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100618

Factors affecting the performance of Pantaneiro horses
Provedor de dados: 96
Autores: Souza,Geraldo da Silva e; Gomes,Eliane Gonçalves; Santos,Sandra Aparecida; Rezende,Adalgiza Souza Carneiro de; Andrade,Débora Roque de Freitas; Nogueira,Márcia Furlan; Trigo,Pablo; Abreu,Urbano Gomes Pinto de.
ABSTRACT This study aimed to assess the physical performance of Pantaneiro horses with and without equine infectious anemia (EIA) under functional conditions of cattle management. The horses were subjected to a performance test and split into two groups according to a completely randomized design: animals were chosen from populations testing positive and negative for EIA. Performance was measured as a function of a data envelopment analysis (DEA) model considering four outputs and one unitary input. The output measures were the distance achieved in the performance test, hematocrit as a weighted average over the test duration, respiratory rate as weighted average over the test duration, and the level of lactic acid at the test termination. Weights for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Covariance analysis; Data envelopment analysis; Equine infectious anaemia; Experimental design; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100502

Genetic divergence among accessions of Arachis repens based on vegetative morphological traits
Provedor de dados: 96
Autores: Azevedo,José Marlo Araújo de; Silva,Hellen Sandra Freires da; Assis,Giselle Mariano Lessa de; Santos,Laís Fernanda Andrade dos; Wolter,Priscila Ferreira.
The objective of this study was to verify the existence of genetic variability among accessions of Arachis repens based on vegetative morphological characters, identifying those which contribute least for distinction of those accessions. Nineteen accessions were evaluated in a completely randomized design with ten replicates, established in 4-m² plots. The traits evaluated were: basal leaflet length, basal leaflet width, apical leaflet length, apical leaflet width, petiole length, internode average length and internode diameter. The data obtained were submitted to univariate statistical analysis and accessions were grouped by the Scott-Knott test, at 1% of probability. The analysis of canonical variables and Tocher method were used to study the genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage Peanut; Genetic improvement; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001000001

Morphological traits and type of dairy goats registered in Brazil from 1976 to 2009
Provedor de dados: 96
Autores: Ferreira,Talita Andrade; Pereira,Idalmo Garcia; Gouveia,Aurora Maria Guimarães; Pires,Aldrin Vieira; Facó,Olivardo; Meira,Camila Tângari; Garcia,Iraides Ferreira Furusho; Guimarães,Maria Pia Souza Lima Mattos de Paiva.
Data from 2439 goats of the Saanen, Alpine, Anglo Nubian and Toggenburg breeds recorded from 1976 to 2009 by the Association of Goats and Sheep Breeders of Minas Gerais were used in principal component analysis. After consistency of data, six morphological variables (thorax perimeter, body length, withers height, height, width and length of the rump) and 12 variables related to breed standard score and fitness (breed characteristic, head, palette and topline, feet and legs, dairy type, body capacity, udder, rear and front ligament, udder texture, teat and final score) were analyzed. Based on the magnitude of the eigenvalue (lower than 0.7), eleven variables considered redundant were discarded, resulting in reduced costs of technician labor to evaluate the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlation; Discard of variable; Goat; Multivariate analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001200004

Phenotypic diversity between Brazilian fighting cocks and naturalized roosters
Provedor de dados: 96
Autores: Ibiapina Neto,Vicente; Barbosa,Firmino José Vieira; Campelo,José Elivalto Guimarães; Sarmento,José Lindenberg Rocha; Santos,Natanael Pereira da Silva; Carvalho,Marcos David Figueiredo de.
ABSTRACT The present study was carried out to evaluate the phenotypic diversity between fighting cocks; roosters of the naturalized ecotypes Graúna Dourada, Brejeira, Teresina, and Nordestina; roosters of the Sertaneja genetic (synthetic) group; and family-farmed roosters via descriptive and multivariate analyses. The qualitative traits evaluated by descriptive analysis indicated a prevalence of single comb in the Graúna Dourada, Teresina, Nordestina, and Sertaneja ecotypes, whereas the Brejeira ecotype, fighting cocks, and family-farmed roosters have a pea-type comb, which can be viewed as a sign of introgression of the fighting cock in flocks of the region. Dark plumage prevailed across the groups. The quantitative traits subjected to multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Morphometry; Multivariate analysis; Principal component analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100303

Characterization of tropical forage grass development pattern through the morphogenetic and structural characteristics
Provedor de dados: 96
Autores: Rodrigues,Carlindo Santos; Nascimento Júnior,Domicio do; Silva,Sila Carneiro da; Silveira,Márcia Cristina Teixeira da; Sousa,Braulio Maia de Lana; Detmann,Edenio.
An experiment was carried out with the objective to evaluate growth pattern of tropical forage grass under free growth by using morphogenetic and structural characteristics with the expectation of using this study for forage grass evaluation protocol. The experimental area was established with two cultivars of Panicum maximum Jacq. (Mombaca and Aruana), a hybrid cultivar of P. maximum Jacq. and P. Infestum BRA-7102 (Massai), two cultivars of Brachiaria brizantha (A. Rich.) Stapf (Marandu and Xaraes) and Molasses grass (Melinis minutiflora Beauv.) and jaragua grass (Hyparrhenia rufa (Nees) Stapf.). The grasses were planted in 1.0-m² experimental units with 24 plants arranged in a completely randomized block design with three replications. Growth pattern of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecophysiology; Grass evaluation; Morphogenesis; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300009

Nutritional divergence in genotypes of forage peanut
Provedor de dados: 96
Autores: Ferreira,Alexandre Lima; Maurício,Rogério Martins; Pereira,Luiz Gustavo Ribeiro; Azevêdo,José Augusto Gomes; Oliveira,Leandro Silva; Pereira,José Marques.
The objective of this study was to evaluate the nutritional divergence between ten genotypes of forage peanut, based on chemical composition as well as fermentation and in vitro degradation kinetic characteristics. Treatments consisted of ten genotypes of Arachis pintoi, namely eight accessions (31135, 30333, 15121, 31828, 15598, 31534, 13251 and 31496) and two cultivars (cv. Belmonte and cv. Amarillo). The genotypes were harvested in each plot at a height of 3 cm from the ground, in 42-day intervals, during the time of heaviest rainfall. For the multivariate analysis the following variables, the following were used: crude protein, neutral detergent fiber, potential degradation in 48 hours, degradation rate of insoluble potentially degradable fraction and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Gas production; Multivariate analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400005

Influence of forage production area, concentrate supply, and workforce on productive results in milk production systems
Provedor de dados: 96
Autores: Koerich,Guilherme; Damasceno,Julio Cesar; Bánkuti,Ferenc Istvan; Parré,José Luiz; Santos,Geraldo Tadeu dos.
ABSTRACT This study aimed to investigate the influence of forage production area, concentrate supply, and farm labor on characterization of milk production systems (MPS) and their productive results. Milk volume data provided in 2014 by 110 dairy farms located in the eastern region of Santa Catarina State, Brazil, were obtained from a dairy industry. Forty-four farms with different production levels were selected, in which interviews were carried out aiming to characterize the management practices related to forage production area, concentrate supply, and farm labor. A principal component analysis (PCA) was performed. Then, regressions were made between the principal components (PC) and indicator variables of productive response (annual milk production,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster; Multivariate analysis; Principal component analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100100

Sheep meat commercialization in the retail market in Brazilian cities
Provedor de dados: 96
Autores: Firetti,Ricardo; Alberti,Ana Lúcia Luz; Zundt,Marilice; Santos,Aline de Oliveira; Rego,Fabiola Cristine de Almeida; Astolphi,José Luis de Lima.
ABSTRACT This paper explored the mix market characteristics of sheep meat as a product for sale in different cities in the states of São Paulo and Paraná. For this, 81 products were purchased in 21 outlets sampled in a “non-probabilistic” manner for convenience and then subjected to analysis of yield of meat, bone, and fat. Imported products represented 20% of the total, being marketed in hypermarkets. It was observed that 37% of the total products were obtained in hypermarkets, 31% in supermarkets, 23% in butcher shops, and 8.6% in meat outlets. Almost 9% of the products had not undergone the official slaughter inspection system. The main types of products identified were palettes and legs with bones (33.3 and 24.7%, respectively); however, only 25% were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lamb; Marketing; Multivariate analysis; Sheep industry.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100700

Genetic divergence between genotypes of forage peanut in relation to agronomic and chemical traits
Provedor de dados: 96
Autores: Menezes,Ana Paula Morais; Assis,Giselle Mariano Lessa de; Mataveli,Marcela; Silva,Hellen Sandra Freires da; Azevedo,José Marlo Araújo de; Mendonça,Márcia Silva de.
The objective of this study was to evaluate the genetic divergence of forage peanut in relation to agronomic and chemical traits in both rainy and dry seasons. This experiment was conducted with genotypes from the Forage Peanut Active Germoplasm Bank located in Embrapa Acre. Eighteen genotypes of forage peanut were used: 12 genotypes of A. pintoi, four genotypes of the A. repens species and two interspecific hybrids of A. pintoi × A. repens. The design was of randomized blocks with five replicates. All traits were submitted to analyses of variance and later, study of genetic divergence was done through multivariate analysis techniques, in which the Tocher's optimization method and the nearest neighbor method were used. Dissimilarity measure used in cluster...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis; Genetic improvement; Multivariate analysis; Tocher's optimization.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700008

Multivariate approach in the selection of superior soybean progeny which carry the RR gene
Provedor de dados: 124
Autores: Dallastra,Anderson; Unêda-Trevisoli,Sandra Helena; Ferraudo,Antonio Sergio; Di Mauro,Antonio Orlando.
Efficiency in the use of genetic variability, whether existing or created, increases when properly explored and analysed. Incorporation of biotechnology into breeding programs has been the general practice. The challenge for the researcher is the constant development of new and improved cultivars. The aim of this experiment was to select progenies with superior characteristics, whether or not carriers of the RR gene, derived from bi-parental crosses in the soybean, with the help of multivariate techniques. The experiment was carried out in a family-type experimental design, including controls, during the agricultural year 2010/2011 and 2011/2012 in Jaboticabal in the Brazilian State of São Paulo. From the F3 generation, phenotypically superior plants were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Genetic variability; Multivariate analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000300021

Influence of land use/occupation on water quality in the Trussu river valley, Ceará, Brazil
Provedor de dados: 124
Autores: Neto,José Ribeiro de Araújo; Andrade,Eunice Maia de; Palácio,Helba Araújo de Queiroz; Sales,Maria Monaliza de; Maia,Anthony Rafael Soares.
ABSTRACT The growing pressure on water resources has reduced its availability as regards quality. Data was investigated for two different periods, with the aim of evaluating the influence of the use and occupation of space on the temporal dynamics of the quality of surface and groundwater in the perennialised valley of the Trussu River in the State of Ceará, Brazil. The first period was from September 2002 to February 2004 and the second from April 2013 to April 2014. Twenty-two water samples were taken from nine sampling stations, five on the surface and four underground. The same stations were considered, monitoring 12 attributes of water quality for a total of 2,376 analyses. Temporal dynamics were characterised employing a technique of multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Multivariate analysis; Semi-arid region.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100059

Spatial distribution of sunflower cultivars and the relationship between growth features
Provedor de dados: 124
Autores: Martin,Thomas Newton; Pavinato,Paulo Sérgio; Lorentz,Leandro Homrich; Zielinski,Renice Paula; Refatti,Rosana.
This work aimed to evaluate the performance of six genotypes of sunflower under two spatial distributions between plant rows, and verify the cause effect relation between growth features. The experiment was carried at experimental area of Federal Technological University of Paraná (Campus Dois Vizinhos), evaluating six sunflower cultivars and two spatial distributions (40 and 80 cm between rows), remaining the total plant population similar, 55.000 plants by hectare. It was performed a path analysis, identifying the features that have most influence on sunflower grain yield and one hundred grain weight, also multiple regression analysis was used to estimate the equation for grain yield and one hundred grain weight. It was verified that sunflower genotypes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L; Multivariate analysis; Plant growth.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000200017

Suitability of peduncles of new cashew tree clones for commercial purposes
Provedor de dados: 124
Autores: Freitas,Ailane Souza de; Dantas,Beatriz dos Santos; Araújo,Ídila Maria da Silva; Garruti,Deborah dos Santos.
RESUMO Devido a sua riqueza em compostos bioativos, sabor exótico, polpa carnuda, pele macia e alto teor de açúcares, o pedúnculo do cajueiro é consumido, tanto na forma in natura quanto destinado à industrialização na forma de sucos e derivados. O objetivo deste trabalho foi avaliar a qualidade físico-química e sensorial de pedúnculos de cinco novos clones de cajueiro e compará-los com dois clones comerciais, de forma a auxiliar a seleção de novos materiais adequados para a comercialização como fruta ou para processamento. Foram avaliados acidez titulável, pH, sólidos solúveis, relação Brix/acidez, ácido ascórbico e polifenois totais. O perfil sensorial foi determinado por análise descritiva quantitativa clássica. Os resultados foram submetidos à Anova,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Quantitative Descriptive Analysis; Multivariate analysis; Caracterization.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000300409

Visual assessment of pasture degradation: validation by ground cover and seasonal variation
Provedor de dados: 124
Autores: Monteiro,Edevaldo de Castro; Burak,Diego Lang; Cunha,Alexson de Mello; Passos,Renato Ribeiro; Mendonça,Eduardo de Sá.
ABSTRACT Visual assessments of pasture degradation levels are widespread because they are rapid, practical and inexpensive. However, they can be subjective, making it difficult to distinguish between degradation levels to establish management practices. This fact, in association with the lack of standardization of the number of levels and the assessment periods, suggests a need for further studies. The objective of this study was to evaluate the relation between the degradation levels of visually evaluated pastures and the soil cover measured in fields in summer and winter. Percentages of Brachiaria grass, bare soil, spontaneous vegetation (broad and narrow leaf) and mulch were evaluated in 35 areas with different levels of visual degradation. Canonical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria spp; Soil cover; Multivariate analysis; Quality assessment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100174

Heterozygosity level and its relationship with genetic variability mechanisms in beans
Provedor de dados: 124
Autores: Melo,Rita Carolina de; Trevisani,Nicole; Pereira,Thayse Cristine Vieira; Guidolin,Altamir Frederico; Coimbra,Jefferson Luís Meirelles.
ABSTRACT Heterozygosity is an extremely important resource in early breeding programs using autogamous plants because it is usually associated with the presence of genetic variability. Induced mutation and artificial hybridization can increase distinctly the proportion of loci in heterozygosis. This study aimed to compare segregating and mutant populations and relate the mechanisms used to generate variability with their respective heterozygosity levels tested. The treatments mutant populations (M2, M3, M4, M5, M6 and M7), segregating populations (F4, F5 and F6) and lines (BRS Pérola and IPR Uirapuru) were evaluated by multivariate analysis and compared by orthogonal contrasts. The canonical discriminant analysis revealed which response variables...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Multivariate analysis; Orthogonal contrasts; Multiple allelism; Selection intensity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300480

Alternative for the evaluation of coffee seedlings using Fisher's discriminant analysis
Provedor de dados: 124
Autores: Campos,Katia Alves; Morais,Augusto Ramalho de; Paixão,Crysttian Arantes.
ABSTRACT One of the applications of Fisher's linear discriminant function (FDF) is its use in transforming multivariate data into a new univariate variable. This then makes possible a new option for the variance analysis of multivariate data, in addition to the multivariate analysis of variance (MANOVA). The aim of this work was to select groups of seven characteristics of quality in coffee seedlings using six criteria for selection, to use the FDF to transform such groupings of characteristics into a new variable, and then to compare interpretation of the results obtained from the univariate and multivariate analyses of variance of the characteristics and this new variable, with a view to its use in evaluating coffee seedlings. A randomised block design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variable selection; Multivariate analysis; Data transformation; Analysis of variance; Coffea arabica.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200299

Principal component and cluster analyses to evaluate production and milk quality traits
Provedor de dados: 124
Autores: Abreu,Bueno da Silva; Barbosa,Severino Benone Paes; Silva,Elizabete Cristina da; Santoro,Kleber Régis; Batista,Ângela Maria Vieira; Martinez,Rafael Leonardo Vargas.
ABSTRACT Using multivariate analyses, this study attempted to identify important traits explaining the relationship between milk production and quality produced by Holstein cows. Monthly milk records from three commercial dairy farms located in the Agreste region of Pernambuco, Brazil, collected in the period from 2007 to 2017, were used. A total of 5,872 observations regarding milk production, milk components and somatic cell score (SCS) were analyzed using principal component analysis (PCA) and cluster analysis. According to the former analysis, the first three principal components explained 79.69% of the total variation. Total solids content contributed 29.66% of the variation in the first principal component, while lactose content contributed 49.43% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Dairy cattle; Milk composition.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000300417

Discrimination of geomorphic surfaces with multivariate analysis of soil attributes in sandstone - basalt lithosequence
Provedor de dados: 124
Autores: Campos,Milton César Costa; Marques Júnior,José; Souza,Zigomar Menezes de; Siqueira,Diego Silva; Pereira,Gener Tadeu.
The geomorphic surface concept allows interrelationship among various branches of soil sciences, such as geology, geomorphology and pedology. This association enhances the understanding of spatial soil distribution through landscape, pointing out the soil attributes behavior, which are mainly related to stratigraphy and relief forms. Therefore, this study aims to apply multivariate statistics to categorize geomorphic surfaces in sandstone - basalt lithosequence, so as to provide a basis for soil assessment in similar areas. The study area is located in Pereira Barreto County, SP, Brazil. An area of 530 hectare was selected, where three geomorphic surfaces (I, II and III) were located and mapped. In this area, 134 soil samples were collected at depths of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil Science; Geomorphology; Multivariate analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000300003

Univariate and multivariate nonlinear models in productive traits of the sunn hemp
Provedor de dados: 124
Autores: Bem,Cláudia Marques de; Cargnelutti Filho,Alberto; Carini,Fernanda; Pezzini,Rafael Vieira.
ABSTRACT Multivariate analysis helps to understand the relationships between dependent variables; this methodology has great potential in several areas of knowledge. The aim of this study was to adjust and compare the univariate and multivariate Gompertz and Logistic nonlinear models to describe the productive traits of sunn hemp (Crotalaria juncea L.). Two uniformity trials were performed, and the following productive traits were analyzed in 376 sunn hemp plants along 94 days of observations (four plants per day): the fresh mass of leaves (FML), the fresh mass of stem (FMS), and the fresh mass of the aerial parts (FMAP). The Gompertz and Logistic univariate models were adjusted for each productive trait. To adjust the multivariate models, the errors...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria juncea L.; Multivariate analysis; Fresh mass; Growth modeling.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100418

EVALUATION OF HUMAN POSTURES DURING WORK IN COFFEE CROPS IN THE SOUTHERN REGION OF MINAS GERAIS
Provedor de dados: 107
Autores: Fernandes, Allan Alves; de Lima, Renato Ribeiro; Cirillo, Marcelo Ângelo; Barbosa, Marco Antônio Gomes; Veiga, Elayne Penha.
Brazil is the largest coffee producer in the world and Minas Gerais is the state responsible for 51.14% of this production, corresponding to 1.55 million tons of beans. In this context, contribution from family farming is signifcant. The aim of this work was to use a multivariate statistical methodology to provide plausible and interpretable results to diagnose the most inﬂuential body postures for each worker in coffee crops. Twelve workers were observed during a period of one hour in different tasks. Greater variability of body posture was shown during herbicide application on sloping ground. Despite body postural variability among workers during the tasks, some body postures, like 131 and 231, stood out. The proposed methodology allowed to identify the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cafeicultura; Estatística; Ergonomia na Agricultura coffee culture; Ergonomics; Multivariate analysis; Postural combinations.
Ano: 2017
URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/806

Production and body composition traits of broilers in relation to breast weight evaluated by path analysis
Provedor de dados: 63
Autores: Lorentz,Leandro Homrich; Gaya,Leila de Genova; Lunedo,Raquel; Ferraz,José Bento Sterman; Rezende,Fernanda Marcondes de; Michelan Filho,Tércio.
Breast weight has great economic importance in poultry industry, and may be associated with other variables. This work aimed to estimate phenotypic correlations between performance (live body weight at 7 and 28 days, and at slaughter, and depth of the breast muscle measured by ultrasonography), carcass (eviscerated body weight and leg weight) and body composition (heart, liver and abdominal fat weight) traits in a broiler line, and quantify the direct and indirect influence of these traits on breast weight. Path analysis was used by expanding the matrix of partial correlation in coefficients which give the direct influence of one trait on another, regardless the effect of the other traits. The simultaneous maintenance of live body weight at slaughter and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Multivariate analysis; Phenotypic correlation; Poultry; Pre-selection.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300008

Biodiversity and distribution of arbuscular mycorrhizal fungi in Araucaria angustifolia forest
Provedor de dados: 63
Autores: Moreira,Milene; Baretta,Dilmar; Tsai,Siu Mui; Gomes-da-Costa,Sandra Maria; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia (Bert.) O. Ktze. is an endangered Brazilian coniferous tree that has been almost exterminated in the native areas because of uncontrolled wood exploitation. This tree has been shown to be highly dependent on arbuscular mycorrhizal fungi (AMF) and, therefore, AMF may be essential for forest sustainability and biological diversity. Root colonization, density and diversity of AMF spores were assessed in two Araucaria forest stands at the State Park of Alto Ribeira (PETAR), at two sampling dates: May and October. A comparison was made between a mature native stand composed of Araucaria trees mixed into a variety of tropical trees and shrubs, without any sign of anthropogenic interference (FN) and an Araucaria stand planted in 1987 (R),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Pine; Diversity; Spore density; Root colonization; Multivariate analysis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400010

Soil mesofauna in consolidated land use systems: how management affects soil and litter invertebrates
Provedor de dados: 63
Autores: Zagatto,Maurício Rumenos Guidetti; Zanão Júnior,Luiz Antônio; Pereira,Arthur Prudêncio de Araújo; Estrada-Bonilla,German; Cardoso,Elke Jurandy Bran Nogueira.
ABSTRACT: Soil mesofauna consists of small invertebrates that live in the soil or litter and are sensitive to climatic conditions, management systems, plant cover and physical or chemical soil attributes. These organisms are active in the cycling of nutrients, since they fragment the organic matter hereby accelerating microbial decomposition. The aim of this study was to evaluate the invertebrate community in no-tillage, conventional tillage, minimum tillage and secondary forest in regeneration to determine the relationship of mesofauna to litter, soil attributes, management and seasonality. Therefore, ten soil samples in each system and eight litter samples in no-tillage and the forest were taken over four seasons. These samples remained in Berlese...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; No-tillage; Multivariate analysis; Fauna density; Mites.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200165

Phenotypic and molecular characterization of apple (Malus × domestica Borkh) genetic resources in Greece
Provedor de dados: 63
Autores: Ganopoulos,Ioannis; Tourvas,Nikolaos; Xanthopoulou,Aliki; Aravanopoulos,Filippos A.; Avramidou,Euaggelia; Zambounis,Antonios; Tsaftaris,Athanasios; Madesis,Panagiotis; Sotiropoulos,Thomas; Koutinas,Nikolaos.
ABSTRACT: The phenotypic and genetic analysis of apple (Malus × domestica Borkh) genotypes is essential for breeding species. Information on the morphology and genetic structure of apple offers significant help for germplasm maintenance and selection of suitable material to breed superior cultivars. This study shows the results of an investigation on the morphology and the genetic diversity for 19 apple cultivars, which are preserved in an ex situ collection in Naoussa, Central Macedonia, Greece. Information was recorded over a 5-year period for 47 traits describing plant morphology and phenotype, as well as leaf and fruit quality. Data were analyzed using the principal component analysis (PCA) method. The Euclidean distance metric and the Ward’s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic diversity; Genotyping; Microsatellite markers; Multivariate analysis; Phenotyping.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600509

Genetic diversity of table grape based on morphoagronomic traits
Provedor de dados: 63
Autores: Leão,Patrícia Coelho de Souza; Cruz,Cosme Damião; Motoike,Sérgio Yoshimitsu.
The conservation and characterization of grape (Vitis spp) genetic resources in germplasm banks have been the basis of its use in breeding programs that result in development of new cultivars. There are at least 10,000 grape cultivars kept in germplasm collection. The genetic diversity in 136 table grape accessions from the state of Bahia, Brazil, was evaluated. Continuous and discrete morphoagronomic traits were assessed. The clustering analysis by the Tocher otimization method resulted in 30 clusters (considering continuous morphoagronomic traits), and 9 clusters (taking into consideration multicategorical traits). There was no agreement between clusters obtained by both, continuous or discrete phenotypic descriptors, independent of the cluster method...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis spp; Genetic resources; Grape; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100007

AMMI analysis to evaluate the adaptability and phenotypic stability of sugarcane genotypes
Provedor de dados: 63
Autores: Silveira,Luís Cláudio Inácio da; Kist,Volmir; Paula,Thiago Otávio Mendes de; Barbosa,Márcio Henrique Pereira; Peternelli,Luiz Alexandre; Daros,Edelclaiton.
Sugarcane (Saccharum sp.) is one of the most important crops in Brazil. The high demand for sugarcane-derived products has stimulated the expansion of sugarcane cultivation in recent years, exploring different environments. The adaptability and the phenotypic stability of sugarcane genotypes in the Minas Gerais state, Brazil, were evaluated based on the additive main effects and multiplicative interaction (AMMI) method. We evaluated 15 genotypes (13 clones and two checks: RB867515 and RB72454) in nine environments. The average of two cuttings for the variable tons of pol per hectare (TPH) measure was used to discriminate genotypes. Besides the check RB867515 (20.44 t ha-1), the genotype RB987935 showed a high average TPH (20.71 t ha-1), general...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: G × E interaction; Principal components; Multivariate analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100005

Clustering of ingredients with amino acid composition similar to the nutritional requirement of Nile tilapia
Provedor de dados: 63
Autores: Bicudo,Álvaro José de Almeida; Pinto,Luis Fernando Batista; Cyrino,José Eurico Possebon.
The search for balanced diets, which may elicit improved growth of fish, requires appropriate selection of available protein sources. This study aims at clustering feedstuffs according to amino acid profile, determining which ones show essential amino acids (EAA) profiles closer to the ideal dietary amino acids requirements of Nile tilapia (Oreochromis niloticus), and studying the relationship among amino acids feedstuffs groups. Tabled data on EAA more cystine and tyrosine, in relation to lysine contents, of 40 feedstuffs ordinarily used to formulate fish diets were studied. Feedstuffs were grouped according to amino acids profile by cluster analysis of Euclidean distances. The principal components analysis was used to determine the relationship among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feedstuff; Fish; Multivariate analysis; Nutrition; Protein.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500004

A morphometric analysis of Eunice Cuvier (Annelida, Polychaeta) species
Provedor de dados: 104
Autores: Costa-Paiva,Elisa M.; Paiva,Paulo C.
Morphology has been the subject of several studies in Eunice specially in the context of the taxonomy and evolutionary relationships of taxa within this genus. In this study we opt for a morphometric approach comparing five species of Eunice to assess if it was possible to delimitate them by shape variables. The morphology of E.fucata, E.insularis, E. cf. ornata, E.rubra, and Eunice sp. was compared using traditional morphometric analysis of 16 measured variables. After removing the size-effect, a Canonical Variates Analysis applied to morphometric variables was able to discriminate all species. In CV1 two major groups of species were discriminated: E.fucata/E.insularis and E. cf. ornata/E.rubra/Eunice sp. CV2 strongly discriminated all species, with E....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body-size; Eunicid; Morphometry; Multivariate analysis; Taxonomy.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200013

Strategies of the small-scale fisheries on the Central Amazon floodplain
Provedor de dados: 36
Autores: FREITAS,Carlos Edwar de Carvalho; BATISTA,Vandick da Silva; INHAMUNS,Antonio José.
A multivariate approach was applied to data of small-scale fisheries developed in Central Amazon, using information about catch composition, environment, fishing gear and season of the hydrological cycle. The correspondence analysis demonstrated to be a good tool for the analysis related multispecies fisheries. The analysis identified patterns of use of fisheries resources by the riverine communities, showing the correlation between the environmental factors and the fishing strategy for the capture of target fish species, indicating the high level of empiric knowledge about the environment and fisheries.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Small-scale fisheries; Central Amazon; Multivariate analysis; Patterns.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672002000100101

Association between parent materials and soil attributes along different geological environments in western Pará, Brazil
Provedor de dados: 36
Autores: BARROS,Gerson Moreira; SANTOS,Jean Cheyson Barros dos; SOUZA JÚNIOR,Valdomiro Severino de; DELARMELINDA,Elaine Almeida; ARAÚJO FILHO,José Coelho de; CÂMARA,Elis Regina Guimarães.
ABSTRACT The expansion of the agricultural frontier into different geological environments in the west of the state of Pará, northern Brazil, makes it necessary to know the influence of the parent material on local soil attributes. This study aimed to evaluate the influence of different parent materials on five soil profiles along a lithosequence exposed by the BR-163 highway, which runs from north to south through western Pará. The soils were classified, morphologically described and their main horizons sampled for physical, mineralogical and chemical analyses, including the determination of micronutrients, forms of phosphorus and secondary forms of iron. Multivariate analysis was used to group the different soil-parent material associations. The results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil mineralogy; Physical attributes; Chemical attributes; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300261

Chemometric identification and nutritional evaluation of three species of Lutjanidae (Perciformes) from the Amazonian Atlantic Coast based on fatty acid profiles
Provedor de dados: 36
Autores: ALMEIDA,Edilene Santos de; SILVA,Evaldo Martins da.
ABSTRACT The fatty acid (FA) profiles of fish species with a similar genetic or geographic origin are important quality parameters that attract bioecological interest because they are inﬂuenced by the nutritional habits of the species. The aim of this study was to determine the proximate compositions and FA profiles of heart, brain and muscle tissues from three fish species (Lutjanus purpureus, Lutjanus synagris and Ocyurus chrysurus) captured from the Amazonian Atlantic Coast. In addition to performing nutritional analysis of the FA profiles, principal components analysis (PCA) was performed as a chemometric tool to discriminate among the species. Lutjanus synagris had the highest protein content (18.23%), while O. chrysurus possessed the highest lipid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Gas chromatography; Lutjanus purpureus; Lutjanus synagris; Ocyurus chrysurus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000400401

Taxonomic relevance of leaf anatomy in Banisteriopsis C.B. Rob. (Malpighiaceae)
Provedor de dados: 39
Autores: Araújo,Josiane Silva; Almeida,Rafael Felipe de; Meira,Renata Maria Strozi Alves.
ABSTRACT We describe the leaf anatomy of 42 of the 60 species of the genus Banisteriopsis, one of the largest and most diverse genera of Malpighiaceae in the Cerrado domain. Our aim was to identify anatomical leaf characters useful for the taxonomy and systematics of this morphological diverse genus. Expanded leaves from herbarium specimens were rehydrated and processed according to usual anatomical methods for analysis under light microscopy. All characters were compared using the Unweighted Pair Group Method with Arithmetic Mean algorithm and expressed in dendrograms. The most useful leaf anatomical characters were petiole contour, presence/absence of vascular bundles in the petiole, the position of the vascular bundles in the petiole, shape of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf glands; Malpighiales; Multivariate analysis; Plant anatomy; Stigmaphylloid clade.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100214

Myrtaceae throughout the Espinhaço Mountain Range of centraleastern Brazil: floristic relationships and geoclimatic controls
Provedor de dados: 39
Autores: Bünger,Mariana de Oliveira; Stehmann,João Renato; Oliveira-Filho,Ary Teixeira.
Although biological surveys and taxonomic revisions provide key information to ecological and evolutionary studies, there is a clear lack of floristic and phytogeographic studies of the mountainous regions of Brazil, which harbor some of the most threatened plant ecosystems on the planet. Myrtaceae has been reported to be one of the most important families in the upland areas of Brazil, as well as in the Atlantic Forest Domain. In this study, we investigated the floristic composition of Myrtaceae throughout the Espinhaço Mountain Range and adjacent highlands of central-eastern Brazil, testing the following hypotheses: floristic similarity increases with geographic proximity; and species distribution is affected by geoclimatic variables. We performed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floristic connections; Montane regions; Multivariate analysis; Atlantic Forest.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100011

Spore diversity among species of Blechnaceae in the Atlantic Forest
Provedor de dados: 39
Autores: Silva,Dilma Melo da; Sylvestre,Lana da Silva; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
ABSTRACT The palynological diversity of Blechnaceae in the Atlantic Forest was investigated. While the monophyletic family belongs to the group of leptosporangiate ferns, a new classification proposed by recent phylogenetic study reorganizes the family and adds new genera. To expand palynological knowledge of the group, the spore morphology of 23 species and a hybrid, distributed among 10 genera, was described. Material from herbarium collections were submitted to acetolysis and mounted on slides, with subsequent statistical analysis of spore measurements. Photomicrographs of the material were taken under both light and scanning electron microscopy. Perine ornamentation varied among psilate, rugulate and scabrate; granules and gemmae were present along...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Austroblechnum; Blechnum; Spore; Multivariate analysis; Palynology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300412

Pollen morphology of some species of Spermacoceae s.s. (Rubiaceae) of the Atlantic Forest, Rio de Janeiro, Brazil
Provedor de dados: 39
Autores: Gonçalves-Esteves,Vania; Vieira,Gabrielle Reboredo Menezes; Carvalho,Renata Jacomo Paixão de; Crespo,Sonia Regina de Melo; Mendonça,Claudia Barbieri Ferreira.
ABSTRACT This work aimed to morphologically characterize 22 species of Spermacoceae s.s found in the Atlantic Forest in the state of Rio de Janeiro with the purpose of improving palynological knowledge of the studied species. The studied species included six species of Borreria and Denscantia cymosa, Emmeorhiza umbellata, Hexasepalum apiculatum, H. radula, H. teres, Manettia fimbriata, Mitracarpus eichleri, M. frigidus, M. hirtus, M. lhotzkyanus, M. megapotamicus, Oldenlandia salzmannii, Pentodon pentandrus, Richardia brasiliensis, Richardia scabra and Spermacoce rubescens. Acetolysed pollen grains were analyzed using light (LM) and scanning electron miscroscopy (SEM). The pollen grains varied in size (polar diameter) from medium to large, with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gentianales; Multivariate analysis; Palynology; Rubioideae; Systematics.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000200243

Canonical correlations among grapevine agronomic and processing characteristics
Provedor de dados: 1
Autores: Cargnin, Adeliano.
Canonical correlation analysis allows conclusions to be drawn about the occurrence and magnitude of associations between two groups of characteristics. This study estimated the magnitude of association and interdependence between two trait groups of clones of two varieties of Vitis vinifera grapes. The study was based on the mean data of eight characteristics from two experiments to test the performance of these clones: the first experiment provided data from seven clones of Cabernet Sauvignon, which evaluated in the northern San Joaquin Valley, California, United States, and the second data set was from six clones of the Chardonnay variety, which were evaluated in the Napa Valley, California, United States. The canonical correlations among the two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Multivariate analysis; Variety; Selection; Clones.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42619

Análise multivariada e índice de seleção na identificação de genótipos superiores de feijão-caupi - doi: 10.4025/actasciagron.v32i4.4631
Provedor de dados: 1
Autores: Bertini, Cândida Hermínia Campos de Magalhães; Universidade Federal do Ceará; Almeida, Wener Santos de; Universidade Federal do Ceará; Silva, Ana Paula Moura da; Unviversidade Federal do Ceará; Silva, José Wêndney Lima e; UFC; Teófilo, Elizita Maria; Universidade Federal do Ceará.
Objetivou-se com esse trabalho avaliar a divergência genética de genótipos de feijão-caupi por meio de técnicas multivariadas e identificar aqueles que apresentam a melhor combinação para diferentes características por meio de índice de seleção. O experimento foi desenvolvido na Universidade Federal do Ceará, no período de fevereiro a junho de 2008, utilizando-se 47 genótipos de feijão-caupi de várias procedências. O experimento foi constituído de parcelas de uma fileira contendo oito plantas, sem repetição. Os caracteres avaliados foram o porte da planta; a posição da vagem na copa da planta; o número de vagens por planta; o comprimento das vagens; o número de sementes por vagem; o peso de 100 sementes e a produção; o número de dias para a floração e o...
Tipo: Pesquisa Empírica de Campo
Palavras-chave: Agronomia; Fitotecnia; Melhoramento vegetal Vigna unguiculata L.; Análise multivariada; Feijão-de-corda; Genitores; Índice de seleção Melhoramento vegetal Vigna unguiculata L.; Multivariate analysis; Cowpea; Parents; Selection index.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4631

Uso do algoritmo de Gower na determinação da divergência genética entre acessos de tomateiro do grupo cereja - doi: 10.4025/actasciagron.v32i3.4888
Provedor de dados: 1
Autores: Rocha, Mariella Camargo; Universidade Federal Rural do Rio de Janeiro; Gonçalves, Leandro Simões Azeredo; Universidade Estadual do Norte Fluminense; Rodrigues, Rosana; Universidade Estadual do Norte Fluminense; Silva, Paula Renata Alves da; Universidade Federal Rural do Rio de Janeiro; Carmo, Margarida Goréte Ferreira do; Universidade Federal Rural do Rio de Janeiro; Abboud, Antonio Carlos de Souza; Universidade Federal Rural do Rio de Janeiro.
A análise conjunta de variáveis qualitativas e quantitativas tem sido apontada como ferramenta útil na estimativa da divergência genética entre os acessos de uma coleção de germoplasma. O presente trabalho teve como objetivos caracterizar uma coleção de germoplasma de tomateiro do grupo cereja, com base em descritores qualitativos e quantitativos e utilizar o algoritmo de Gower na quantificação da divergência genética. Estudaram-se 40 acessos de tomateiro cereja, cultivados em manejo orgânico nas condições de Seropédica, Estado do Rio de Janeiro. Foram utilizados quatro descritores qualitativos relacionados aos frutos e nove descritores quantitativos. Os dados foram analisados de forma conjunta pelo algoritmo de Gower. Detectou-se variabilidade para...
Palavras-chave: Solanum lycopersicum; Análise multivariada; Descritores qualitativos; Descritores quantitativos; Programa R 5.01.03.05-9 Solanum lycopersicum; Multivariate analysis; Qualitative descriptors; Quantitative descriptors; R software.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4888

Canonical correlations among grapevine agronomic and processing characteristics
Provedor de dados: 1
Autores: Cargnin, Adeliano.
Canonical correlation analysis allows conclusions to be drawn about the occurrence and magnitude of associations between two groups of characteristics. This study estimated the magnitude of association and interdependence between two trait groups of clones of two varieties of Vitis vinifera grapes. The study was based on the mean data of eight characteristics from two experiments to test the performance of these clones: the first experiment provided data from seven clones of Cabernet Sauvignon, which evaluated in the northern San Joaquin Valley, California, United States, and the second data set was from six clones of the Chardonnay variety, which were evaluated in the Napa Valley, California, United States. The canonical correlations among the two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Multivariate analysis; Variety; Selection; Clones.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42619

Diversidade no teor de nutrientes em grãos de feijão crioulo no Estado de Santa Catarina - doi: 10.4025/actasciagron.v33i3.6328
Provedor de dados: 1
Autores: Pereira, Tamara; CAV-UDESC; Coelho, Cileide Maria Medeiros; CAV-UDESC; Santos, Julio Cesar Pires dos; CAV-UDESC; Bogo, Amauri; CAV-UDESC; Miquelluti, David Jose; CAV-UDESC.
O feijão representa importante fonte de nutrientes, e pode ter seus teores aumentados com o uso de genótipos que apresentem naturalmente elevados teores destes nutrientes, como ocorre nos genótipos crioulos. O objetivo deste trabalho foi caracterizar  34 genótipos crioulos do Banco Ativo de germoplasma de Feijão do CAV-UDESC quanto ao teor de nutrientes (cálcio, magnésio, zinco, ferro, fósforo, potássio, proteína total e solúvel) e antinutriente (fitato) nos grãos, durante os anos de cultivo de 2005/2006 e 2006/2007. O teor de nutrientes nos grãos de feijão foi influenciado tanto pelo genótipo, quanto pelas condições climáticas, com respostas diferentes em cada ano de cultivo, e entre os dois anos de cultivo. Os genótipos crioulos BAF 60, 69 e 108...
Palavras-chave: 5.00.00.00-4 variabilidade genética; Qualidade nutricional; Germoplasma; Análise multivariada 5.01.03.00-8 genetic variability; Nutrition quality; Germplasm; Multivariate analysis.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6328

Formação de supercaracteres para seleção de famílias de maracujazeiro amarelo - DOI: 10.4025/actasciagron.v32i2.3328
Provedor de dados: 1
Autores: Ferreira, Fábio Medeiros; Universidade Federal do Amazonas - Instituto de Ciências Exatas e Tecnologia em Itacoatiara; Neves, Leonarda Grillo; Universidade Estadual do Mato Grosso - Departamento de Agronomia; Bruckner, Claudio Horst; Universidade Federal de Viçosa - Departamento de Fitotecnia; Viana, Alexandre Pio; Universidade Estadual do Norte Fluminense - Laboratório de Melhoramento Genético Vegetal; Cruz, Cosme Damião; UFV; Barelli, Marco Antonio Aparecido; Unemat.
No presente estudo, objetivou-se formar supercaracteres para seleção simultânea de variáveis relacionadas à produção e qualidade dos frutos em famílias de irmãos completos e, ou, meios-irmãos de maracujazeiro amarelo (Passiflora edulis f. flavicarpa). Avaliaram-se 113 famílias e 11 variáveis, no Delineamento I de Comostock e Robinson, em blocos ao acaso com três repetições. A análise de fatores estabeleceu três supercaracteres: tamanho do fruto (TF), produtividade (PROD) e rendimento de indústria (RI). Para grande maioria das variáveis originais, foram verificados sinais de cargas fatoriais que refletem o verdadeiro sentido da seleção em programas de melhoramento de maracujá. Detectou-se variabilidade genética nos níveis hierárquicos de genitor masculino e...
Palavras-chave: Agronomia Passiflora edulis f. flavicarpa; Seleção simultânea; Análise multivariada; Melhoramento genético Melhoramento Vegetal Passiflora edulis f. flavicarpa; Simultaneous selection; Multivariate analysis; Genetic breeding.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3328

Exploratory data inference for detecting mastitis in dairy cattle
Provedor de dados: 2
Autores: Silva, Rodes Angelo Batista da; Pandorfi, Héliton; Almeida, Gledson Luiz Pontes de; Silva, Marcos Vinícius da.
The aim of this study was to employ the principal component technique to physiological data and environmental thermohygrometric variables correlated with detection of clinical and subclinical mastitis in dairy cattle. A total of 24 lactating Girolando cows with different clinical conditions were selected (healthy, and with clinical or subclinical mastitis). The following physiological variables were recorded: udder surface temperature, ST (°C); eyeball temperature, ET (°C); rectum temperature, RT (°C); respiratory frequency, RF (mov. min-1). Thermohygrometric variables included air temperature, AirT (°C), and relative humidity, RU (%). ST was determined by means of thermal images, with four images per animal, on these quarters: front left side (FL), front...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Images; Lactating cows.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/46394

Analysis of floristic similarity between forest remnants from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v34i3.8500
Provedor de dados: 3
Autores: Slusarski, Simone Rodrigues; Universidade Estadual de Maringá; Souza, Maria Conceição de; Universidade Estadual de Maringá.
The vegetation from the upper Paraná river floodplain is a fragment of Seasonal Semideciduous Forest (SSF) that presents fields, lowlands and extensive areas of pasture along with forest formations. Aiming to accomplish analyses of floristic similarity between riparian forests remnants in this floodplain, an analysis using nine surveys was performed, four on the right bank, two on the left bank and three at an island, including tree species. Sørensen’s (ISs) and Jaccard’s (ISj) similarity coefficients were calculated, and a Correspondence Analysis (CA) was applied to a matrix of presence and absence of species. Thirty-seven families, 80 genera and 110 species were recorded. Among the species, 5.5% were generalist, while 29.1% were exclusive to one survey....
Tipo: Levantamentos florísticos; Análises de similaridade
Palavras-chave: 2.03.00.00-0 coefficients of similarity; Multivariate analysis; Seasonal semideciduous forest; Riparian vegetation Botânica.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8500

Testing arbitrary classes of light in a physiognomically heterogeneous area of "campo rupestre" vegetation
Provedor de dados: 42
Autores: MOREIRA,ANA S.F.P.; BORBA,EDUARDO L.; LEMOS-FILHO,JOSE P.
The Brazilian "campo rupestre" vegetation shows high light heterogeneity, characteristic which is often disregarded in ecophysiological studies due the difficult of obtaining accurate measurements in a complex environment. The aim of the present study it was to describe how much heterogeneous is the light distribution in this environment, as well as tried to define classes in relation to the photosynthetically active radiation (PAR) for 30 rupicolous individuals of Bulbophyllum involutum. The individuals were marked and previously classified in light classes visually predetermined ("full sun", "partially shaded" and "shaded"). Once defined these classes, principal component analysis, cluster and dispersal analyses using direct and indirect PAR measures...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulbophyllum involutum; Habitat; Light heterogeneity; Multivariate analysis; Orchidaceae; Rocky outcrops.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200635

Agronomic performance and genetic divergence between genotypes of Manihot esculenta
Provedor de dados: 42
Autores: GILES,JOÃO ANTONIO D.; OLIOSI,GLEISON; RODRIGUES,WEVERTON P.; BRAUN,HEDER; RIBEIRO-BARROS,ANA I.; PARTELLI,FÁBIO L.
Abstract The morphoagronomic characterization of 12 genotypes of M. esculenta was performed during the 2013/2014 and 2014/2015 crop years. The 12 genotypes were planted in a randomized block design, with four replicates per genotype. Number of tuberous roots per plant, weight of tuberous roots, root yield, total plant weight, harvest index, plant height, height of first branch, number of shoots, stem diameter, number of buds, leaf dry weight and petiole length were evaluated. Genotypes “Camuquem” and “Goiás” were the most productive, and “Amarela” and “Gema de Ovo” were the most divergent. Seventy percent of genetic diversity was due to petiole length (22.86%), root yield (19.20%), weight of tuberous roots (14.89%) and number of buds (13.72%). Overall, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava; Plant breeding; Dissimilarity; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703639

Testing multivariate analysis in paleoenvironmental reconstructions using pollen records from Lagoa Salgada, NE Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Toledo,Mauro B. de; Barth,Ortrud M.; Silva,Cleverson G.; Barros,Marcia A.
Despite the indisputable significance of identification of modern analogs for Paleoecology research, relatively few studies attempted to integrate modern and fossil samples on paleoenvironmental reconstructions. In Palynology, this general pattern is not different from other fields of Paleoecology. This study demonstrates the practical application of modern pollen deposition data on paleoenvironmental reconstructions based on fossil pollen by using multivariate analysis. The main goal of this study was to use Detrended Correspondence Analysis (DCA) to compare pollen samples from two sediment cores collected at Lagoa Salgada, a coastal lagoon located at northeastern Rio de Janeiro State. Furthermore, modern surface samples were also statistically compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Paleoenvironmental reconstruction; Quaternary palynology; Lagoa Salgada.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400013

Tropane alkaloids and calystegines as chemotaxonomic markers in the Solanaceae
Provedor de dados: 42
Autores: Pigatto,Aline G.S.; Blanco,Carolina C.; Mentz,Lilian A.; Soares,Geraldo L.G.
ABSTRACT This study assessed the occurrence and distribution of tropane alkaloids and calystegines in genera of the family Solanaceae to identify patterns of distribution and make evolutionary inferences. A database of tropane alkaloids and calystegines occurrences was constructed from the results of a search of scientific websites and a hand search of periodicals. The terms "Solanaceae", "tropane alkaloids", and "calystegines" were used as index terms for a full-text article search unrestricted by date of publications. The number of occurrence and chemical diversity indices were calculated and cluster analysis and principal components analysis were performed. Overall, 996 occurrences were reported, 879 of tropane alkaloids (88.3%) and 117 of calystegines...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical diversity; Number of occurrence; Geographic distribution; Multivariate analysis; Solanaceae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502139

Morphological and morphometric variations of Dicrocoelium rileyi (Digenea: Dicrocoelidae) parasitizing Tadarida brasiliensis (Chiroptera: Molosiidae) in Mexico
Provedor de dados: 42
Autores: FALCÓN-ORDAZ,JORGE; OCTAVIO-AGUILAR,PABLO; ESTRELLA-CRUZ,ISABEL.
Abstract:  Fifty-five adult Dicrocoelium rileyiMacy, 1931 parasitizing Tadarida brasiliensis (Geoffroy, 1824) from Durango, Nuevo Leon, Puebla, Zacatecas and Mexico State were morphologically described and morphometrically analyzed. To evaluate the degree of variation among populations from the five localities, 27 morphometric measures of this species were transformed into an orthogonal factor by principal component analysis (PCA), and a posterior comparison among populations was performed using discriminant analysis of principal components (DAPC). Significant differences were observed with exceptions between the Puebla – Zacatecas and Nuevo Leon – Mexico State populations when forming three groups with an 88 % assignation. The Durango population was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bats; Platyhelminthes; Interlocal variability; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700609

Morphological affinities of Homo naledi with other Plio-Pleistocene hominins: a phenetic approach
Provedor de dados: 42
Autores: NEVES,WALTER A.; BERNARDO,DANILO V.; PANTALEONI,IVAN.
ABSTRACT Recent fossil material found in Dinaledi Chamber, South Africa, was initially described as a new species of genus Homo, namely Homo naledi. The original study of this new material has pointed to a close proximity with Homo erectus. More recent investigations have, to some extent, confirmed this assignment. Here we present a phenetic analysis based on dentocranial metric variables through Principal Components Analysis and Cluster Analysis based on these fossils and other Plio-Pleistocene hominins. Our results concur that the Dinaledi fossil hominins pertain to genus Homo. However, in our case, their nearest neighbors are Homo habilis and Australopithecus sediba. We suggest that Homo naledi is in fact a South African version of Homo habilis, and not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cranio-dental traits; Human evolution; Human origins; Multivariate analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502199

A study of the dry forest communities in the Dominican Republic
Provedor de dados: 42
Autores: García-Fuentes,Antonio; Torres-Cordero,Juan A.; Ruiz-Valenzuela,Luis; Lendínez-Barriga,María Lucía; Quesada-Rincón,Juan; Valle-Tendero,Francisco; Veloz,Alberto; León,Yolanda M.; Salazar-Mendías,Carlos.
This paper is a floristic and phytosociological study of the dry forest communities of the Dominican Republic. A total of 69 relevés in dry forest biotopes were carried out. The samples were subsequently subjected to Detrended Correspondence Analysis for the determination and study of possible groupings. The study does not cover tree formations growing on serpentines, nor the so-called semideciduous forests, peculiar to areas with higher rainfall. A total of nine phytocoenoses were identified. The most significant results led to the description of six new phytosociological associations: Simaroubetum berteroani(thorny dry forest on coastal dunes), Phyllostylo rhamnoidis-Prosopidetum juliflorae (southern Dominican disturbed dry forest), Consoleo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caribbean; Endemism; Multivariate analysis; Phytosociology; Xericity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100249

Genetic diversity of promising ‘conilon’ coffee clones based on morpho-agronomic variables
Provedor de dados: 42
Autores: GILES,JOÃO ANTONIO D.; PARTELLI,FÁBIO L.; FERREIRA,ADÉSIO; RODRIGUES,JOICE P.; OLIOSI,GLEISON; SILVA,FERNANDO H. LIMA E.
Abstract Knowledge of the genetic variability of a population is essential to guide its preservation and maintenance in addition to increasing the efficiency of genetic breeding programs. On this basis, this study was conducted to evaluate the genetic diversity of Coffea canephora genotypes using multivariate statistical procedures applied to a set of morpho-agronomic variables. The materials employed in this study constitute a crop located in Vila Valério - ES, Brazil, where the genotypes are arranged in a randomized-blocks experimental design with four replicates. Significant differences were detected by the F test at the 1% or 5% probability levels among the genotypes for all evaluated traits, demonstrating heterogeneity of genetic constitution in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Dissimilarity; Multivariate analysis; Plant breeding.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502437

Identification of informative performance traits in swine using principal component analysis
Provedor de dados: 45
Autores: Barbosa,L.; Lopes,P.S.; Regazzi,A.J.; Guimarães,S.E.F.; Torres,R.A.
Using principal component analysis, records of 435 animals from an F2 swine population were used to identity independent and informative variables of economically important performance. The following performance traits were recorded: litter size at birth (BL), litter size at weaning (WL), teat number (TN), birth weight (BW), weight at 21 (W21), 42 (W42), 63 (W63) and 77 (W77) days of age, average daily gain (ADG), feed intake (FI) and feed:gain ratio (FGR) from 77 to 105 days of age. Six principal components expressed variation lower than 0.7 (eigen values lower than 0.7) suggesting that six variables could be discarded with little information loss. The discarded variables present significant simple linear correlation with the retained variables. Retaining...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Swine; Multivariate analysis; Correlation; Discard; Growth; Litter size; Performance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600016

Museum collections indicate bird defaunation in a biodiversity hotspot
Provedor de dados: 49
Autores: Cavarzere,Vagner; Silveira,Luis Fabio; Tonetti,Vinicius Rodrigues; Develey,Pedro; Ubaid,Flávio Kulaif; Regalado,Luciano Bonatti; Figueiredo,Luiz Fernando de Andrade.
Abstract Ipanema National Forest, southeastern Brazil, once contained 340 bird species. Forest cover suffered for centuries from log exploitation and, as a result, most of the remaining forests are now an impoverished subset of the original vegetation. We show how the bird community changed over time by comparing historical and recent records. Currently, 228 species can be recorded, for a compilation of 410 species, of which 359 are documented. Some 89 forest species with historical records failed to be detected in recent surveys. Of the 72 Atlantic Forest or Cerrado endemic species, no more than 29 (40%) are still found. The bird community changed from one which used to be related to coastline rain forests to another, which relates more to drier...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Cerrado; Hierarchical cluster analysis; Multivariate analysis; Semideciduous forests.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000400203

The birds at Ilha Comprida beach (São Paulo State, Brazil): a multivariate approach
Provedor de dados: 49
Autores: Barbieri,Edison; Paes,Eduardo Tavares.
Birds were censused weekly from January 1999 to January 2001 along Ilha Comprida beach, a barrier island off São Paulo, southeastern Brazil. To evaluate the similarity in the bird's species composition among the weekly surveys, species counts data were arranged on a data matrix with 144 weekly surveys, analyzed following a multivariate analysis protocol. We counted a total of 205,399 individuals and 52 species. Migratory birds were an important component of the avifauna (maximum N = 21,294 individuals and 14 species). The largest numbers of birds were observed during summer, when Nearctic migrants arrive. All 14 of the most common species were migrants, including Calidris alba, Sterna maxima, Charadrius semipalmatus, Sterna hirundo, Thalasseus maximus,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seabirds; Ecology; Ilha Comprida; Migration; Shorebirds; Sandy beaches; Multivariate analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000300003

Adaptability and stability of erect cowpea genotypes via REML/BLUP and GGE Biplot
Provedor de dados: 53
Autores: Santos,Adriano dos; Ceccon,Gessi; Teodoro,Paulo Eduardo; Correa,Agenor Martinho; Alvarez,Rita de Cássia Félix; Silva,Juslei Figueiredo da; Alves,Valdecir Batista.
ABSTRACT The objective of this study was to investigate the association between the GGE Biplot and REML/BLUP methods and select cowpea genotypes that meet simultaneously high grain yield, adaptability and stability in the Mato Grosso do Sul environments. The experiments were carried out from February to July 2010, 2011 and 2012 in the municipalities of Dourados, Aquidauana and Chapadão do Sul. The experiments in Chapadão do Sul were conducted only in the years of 2010 and 2011, totaling eight environments. After detecting significant genotypes × environments (GE) interaction, the adaptability and the phenotypic stability of cowpea genotypes were analyzed by GGE Biplot and REML/BLUP methods. These methods were concordant in the identification of the best...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Multivariate analysis; Mixed models; Genotypes × environments interaction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300299

Quality of ‘Oso Grande’ strawberries is affected by O2, CO2 and N2O concentrations during controlled atmosphere storage
Provedor de dados: 53
Autores: Cunha Junior,Luis Carlos; Morgado,Cristiane Maria Ascari; Jacomino,Angelo Pedro; Trevisan,Marcos José; Parisi,Marise Cagnin Martins; Corrêa,Gilmarcos de Carvalho; Teixeira,Gustavo Henrique de Almeida.
ABSTRACT Consumers around the world appreciate strawberries for their taste. They have low calories and high concentrations of soluble fibers, vitamin C and flavonoids. This paper verified the combined effect of O2, CO2, and N2O levels on ‘Oso Grande’ strawberries stored at 10° C, under controlled atmosphere (CA). Five different gas mixtures were used: 0.03 kPa CO2 + 20 kPa O2, 80 kPa N2O + 20 kPa O2, 90 kPa O2 + 10 kPa N2, 60 kPa O2 +40 kPa CO2, and 20 kPa O2 + 20 kPa CO2 + 60 kPa N2O. The lowest incidence of postharvest decay was observed with treatment20 kPa O2 + 20 kPa CO2 + 60 kPa N2O, followed by 80 kPa N2O +20 kPa O2 and 90 kPa O2 + 10 kPa N2. The treatment 60 kPa O2 + 40 kPa CO2 induced an increase in the production of acetaldehyde and ethanol, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa Duch; Acetaldehyde; Ethanol; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200274

Hybrid maize selection through GGE biplot analysis
Provedor de dados: 53
Autores: Oliveira,Tâmara Rebecca Albuquerque de; Carvalho,Hélio Wilson Lemos de; Oliveira,Gustavo Hugo Ferreira; Costa,Emiliano Fernandes Nassau; Gravina,Geraldo de Amaral; Santos,Rafael Dantas dos; Carvalho Filho,José Luiz Sandes de.
ABSTRACT The cultivation of genotypes non-adapted to the cultivation region of interest is among the main factors responsible for low yield. The aim of the present study is to select hybrid maize through GGE biplot analysis and to assess its adaptability and stability in different environments in Northeastern Brazil. Twenty-five hybrid maize cultivars were assessed in ten different environments in Northeastern Brazil in 2012 and 2013 based on the randomized block design, with two replications. The analysis of variance and assessment of genotype adaptability and stability were made through GGE biplot analysis, based on grain yield. Analysis of variance results showed different performances depending on the genotype, as well as genotype/environment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: G × E interaction; Multivariate analysis; Zea mays L.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200166

Floristic and phytosociological description of a riparian forest and the relationship with the edaphic environment in Caiuá Ecological Station - Paraná - Brazil
Provedor de dados: 52
Autores: Costa Filho,Lysias Vellozo da; Nanni,Marcos Rafael; Campos,João Batista.
Relationship in soil physical and chemical properties of soil, floristic and phytosociological association of semi-deciduous riparian forest of the Paranapanema River (R) and Rosana Reservoir (Re) in the Caiuá Ecological Station were evaluated. Aerial photography and satellite image were used to determine the forest cover and to locate 15 transects 50 x 30m (1500m²),which were used to sample trees with diameters at breast height (DBH)&gt;15 cm. R contained 1487 individuals from 33 families, 64 genders and 73 species. The Shannon-weaver index (H') was 3.318. Re contained 1146 individuals from 35 families, 72 genders and 85 species and the H' was 3.755. There was a statistically significant difference (P&lt;0.05) between R and Re environments and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical semi deciduous forest; Riverine forest; Multivariate analysis; Riparian forest; Soil-vegetation; Caiuá Ecological Station.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600013

Soybean parent selection based on genetic diversity
Provedor de dados: 52
Autores: Carpentieri-Pípolo,Valéria; Pípolo,Antônio Eduardo; Silva,Flávio André Martins da; Petek,Marcos Rafael.
Thirty-four soybean lines were assessed for twelve traits. The genetic distances were estimates using multivariate techniques, to identify parents to be included in breeding programs for hybridization. Grouping by the Tocher method, from generalized Mahalanobis distances, divided the 34 lines into four groups. The most important agronomic traits, weight of seeds per plot, plant height, height of first pod and days to maturity were considered when recommending for crossing. The following crosses were recommended based on the genetic divergence and the key agronomic traits: lines 23, 10, 2, 27 and 25 (group I) with genotype 6 (group II) and genotype 16 (group III). Thus only ten crosses would be made, representing only 2% of the total crosses which could be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Genetic divergence; Mahalanobis; Multivariate analysis.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300008

Genetic divergence in sweet cassava cultivars using morphological agronomic traits and RAPD molecular markers
Provedor de dados: 52
Autores: Rimoldi,Fabrício; Vidigal Filho,Pedro Soares; Kvitschal,Marcus Vinícius; Gonçalves-Vidigal,Maria Celeste; Prioli,Alberto José; Prioli,Sônia Maria Alves Pinto; Costa,Tiago Ribeiro da.
In this work the genetic divergence among 14 sweet cassava cultivars was estimated by their morphological agronomic traits and RAPD molecular markers. The Tocher cluster analysis and the Nearest Neighbor Method were applied. The most dissimilar cultivars were Pão and Guaíra, Fécula Branca and Pão, and Pão and Caipira, while the most similar cultivar were the Fécula Branca and Branca 1, Branca 3 and Branca 1, and Guaíra and Branca 1. The Jaccard's coefficient showed that the most similar cultivars were Guaíra and Quarenta Quilos, while the most dissimilar were Branca 3 and Amarela da Rama Cinza. The divergence analysis indicated that promising crosses could be made between the Branca 3 cultivar and the Pão, Amarela 1, Fécula Branca and Amarela 2 cultivars...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic diversity; Manihot esculenta; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600025

Multivariate analysis of the spectroscopic profile of the sugar fraction of apple pomace
Provedor de dados: 52
Autores: Gabriel,Luciana Sutil; Prestes,Rosilene Aparecida; Pinheiro,Luís Antonio; Barison,Andersson; Wosiacki,Gilvan.
Pomace, the main by-product of apple juice processing, contains all the fruit's compounds such as minerals, sugars, fibers, enzymes and secondary metabolites after bioprocessing. Dried pomace from four apple varieties (Gala, Fuji, Catarina and Joaquina) was used to extract fructose, glucose, and sucrose, the main soluble sugars contained in apple pomace, to verify the possible use of the sugar fractions. The concentrated sugars were characterized by NMR and FTIR. The partial least squares method (PLS) applied to the NMR and FTIR spectra revealed large amounts of fructose, glucose, and sucrose, without the presence of others compounds. Principal component analysis (PCA) discriminated the studied apple varieties, with a 99% level of significance, as function...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apple pomace; NMR; FTIR; Multivariate analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000300012

Spatial and temporal organization of aquatic insects assemblages in the longitudinal gradient of a tropical river
Provedor de dados: 57
Autores: BAPTISTA,D. F.; DORVILLÉ,L. F. M.; BUSS,D. F.; NESSIAMIAN,J. L.
The distribution and abundance of aquatic insects were studied in the longitudinal gradient of the watershed of Macaé River, a coastal Atlantic Forest river in South-eastern Brazil. Sampling stations were selected in the first, second, fourth, fifth, and sixth orders and sampled in April, July, and October 1995. This represented the end of the rainy season, the dry season, and the beginning of another rainy season, respectively. In each month four samples were collected using a Surber sampler from each of the following substrates: sand, litter deposited in pool areas, litter in riffle areas, and stones. A total of 46,431 specimens of aquatic insects belonging to ten orders were obtained. The data were analyzed by the multivariate methodologies of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insect; Longitudinal gradient; Tropical river; Multivariate analysis.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200012

Time of catheter removal in candidemia and mortality
Provedor de dados: 55
Autores: Nucci,Marcio; Braga,Paula Rocha; Nouér,Simone A.; Anaissie,Elias.
ABSTRACT  Background: The impact of central venous catheter (CVC) removal on the outcome of patients with candidemia is controversial, with studies reporting discrepant results depending on the time of CVC removal (early or any time during the course of candidemia).  Objective: Evaluate the effect of time to CVC removal, early (within 48 h from the diagnosis of candidemia) vs. removal at any time during the course of candidemia, on the 30-day mortality.  Methods: Retrospective cohort study of 285 patients with candidemia analyzing CVC removal within 48 h (first analysis) or at any time (second analysis).  Results: A CVC was in place in 212 patients and was removed in 148 (69.8%), either early (88 patients, 41.5%) or late (60 patients, 28.3%). Overall, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candidemia; Central venous catheter; Mortality; Multivariate analysis; Candida.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702018000600455

[RETRACTED ARTICLE] Risk factors for early-onset ventilator-associated pneumonia in aneurysmal subarachnoid hemorrhage patients
Provedor de dados: 56
Autores: Cui,J.B.; Chen,Q.Q.; Liu,T.T.; Li,S.J.
This study aimed to investigate the risk factors related to ventilator-acquired pneumonia (VAP) in aneurysmal subarachnoid hemorrhage (SAH) patients. From January 2011 to December 2015, a single-center retrospective study including 200 SAH patients requiring mechanical ventilation (MV) ≥48 h was performed. The clinical data of these patients were collected and analyzed. The age range of the patients were 41–63 and 72 (36%) were male. The Glasgow coma scale score range was 5–15 and the Simplified Acute Physiology Score II range was 31–52. One hundred and forty-eight (74%) patients had a World Federation of Neurosurgeons (WNFS) score ≥III. Aneurysm was secured with an endovascular coiling procedure in 168 (84%) patients and 94 (47%) patients presented VAP....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ventilator-acquired pneumonia; Aneurysmal subarachnoid hemorrhage; Risk factors; Multivariate analysis; Pathogen.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000700605

Assessing the diversity of bacterial communities associated with plants
Provedor de dados: 58
Autores: Andreote,Fernando Dini; Azevedo,João Lúcio; Araújo,Welington Luiz.
Plant-bacteria interactions result from reciprocal recognition between both species. These interactions are responsible for essential biological processes in plant development and health status. Here, we present a review of the methodologies applied to investigate shifts in bacterial communities associated with plants. A description of techniques is made from initial isolations to culture-independent approaches focusing on quantitative Polymerase Chain Reaction in real time (qPCR), Denaturing Gradient Gel Electrophoresis (DGGE), clone library construction and analysis, the application of multivariate analyses to microbial ecology data and the upcoming high throughput methodologies such as microarrays and pyrosequencing. This review supplies information...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant-bacteria interactions; Molecular techniques; Multivariate analysis; Endophytes; Rhizosphere.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000300001

The effect of heavy metal contamination on the bacterial community structure at Jiaozhou Bay, China
Provedor de dados: 58
Autores: Yao,Xie-feng; Zhang,Jiu-ming; Tian,Li; Guo,Jian-hua.
Abstract In this study, determination of heavy metal parameters and microbiological characterization of marine sediments obtained from two heavily polluted sites and one low-grade contaminated reference station at Jiaozhou Bay in China were carried out. The microbial communities found in the sampled marine sediments were studied using PCR-DGGE (denaturing gradient gel electrophoresis) fingerprinting profiles in combination with multivariate analysis. Clustering analysis of DGGE and matrix of heavy metals displayed similar occurrence patterns. On this basis, 17 samples were classified into two clusters depending on the presence or absence of the high level contamination. Moreover, the cluster of highly contaminated samples was further classified into two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metal contamination; PCR-DGGE fingerprinting; Multivariate analysis; Bacterial community structure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100071

Categorization of the main descriptors of different ampicillin crystal habits
Provedor de dados: 60
Autores: Flórez-Acosta,Oscar; Tobón-Zapata,Gloria; Valencia-Velasquez,Jaime.
With the purpose of enabling the analysis by digital methods of particles of multisource pharmaceutical raw materials, this study analyzed different crystal habits of ampicillin particles, by grouping the external shapes obtained from 3 different solvents (acetonitrile, ethanol, and methanol), thereby reducing the number of descriptors necessary to adequately represent each shape. For this purpose, a selection of morphological descriptors was used including: circularity, roughness, roundness, compactness, aspect ratio, effective diameter, solidity, convexity, fractal dimension, and 10 Complex Fourier descriptors. These measures cover highly diverse morphological properties and define the crystal habit of a particle. Principal Component Analysis (PCA) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multisource solids; Morphological descriptors; Fourier descriptors; Crystal habits; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400009

Determination of moisture content in lyophilized mannitol through intact glass vials using NIR micro-spectrometers
Provedor de dados: 60
Autores: Muzzio,Cristian Rodrigo; Dini,Nicolás Gabriel; Simionato,Laura Daniela.
Determination of moisture content in lyophilized solids is fundamental to predict quality and stability of freeze-dried products, but conventional methods are time-consuming, invasive and destructive. The aim of this study was to develop and optimize a fast, inexpensive, noninvasive and nondestructive method for determination of moisture content in lyophilized mannitol, based on an NIR micro-spectrometer instead of a conventional NIR spectrometer. Measurements of lyophilized mannitol were performed through the bottom of rotating glass vials by means of a reflectance probe. The root mean standard error of prediction (RMSEP) and the correlation coefficient (R²pred), yielded by the pre-treatments and calibration method proposed, was 0.233% (w/w) and 0.994,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Near-infrared spectroscopy; Lyophilization; Multivariate analysis; Moisture content; Mannitol; Micro-spectrometer.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502011000200010

Analysis of major metallic elements in Chilean wines by atomic absorption spectroscopy
Provedor de dados: 118
Autores: Laurie,V. Felipe; Villagra,Evelyn; Tapia,Jaime; Sarkis,Jorge E. S; Hortellani,Marcos A.
A set of 75 wine samples from seven of the major wine producing regions in Chile were analyzed with flame atomic absorption spectroscopy (AAS) to determine their content of major metallic elements (K, Mg, Ca, Na, Fe and Zn). The results obtained were further analyzed with principal component analysis (PCA) in an attempt to loosely discriminate these wines according to grape type and geographical origin. The metal concentrations measured were within normal ranges, according to previously published data from other wine producing countries. Multivariate statistics allowed the possibility to reasonably discriminate between red and white wines, and to show a distinctive pattern of Na concentration, with higher total contents for the wines produced in the...
Tipo: Journal article
Palavras-chave: Wine; Metal; AAS; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200008

Economic and soil quality indicators in soybean crops grown under integrated crop-livestock and winter-grain cultivation systems
Provedor de dados: 65
Autores: Simioni,Flávio José; Bartz,Marie Luise Carolina; Wildner,Leandro do Prado; Spagnollo,Evandro; Veiga,Milton da; Baretta,Dilmar.
ABSTRACT: This study aimed to evaluate the relationship between economic indicators of soybean crops ( Glycine max L.) cultivated with Crop-Livestock Integration (CLI) or with grain production in winter, and the chemical, physical and biological attributes of the soil. It was selected ten agricultural sites in Santa Catarina to measure economic results and edaphic attributes, data was submitted to a Principal Components Analysis (PCA). Results indicated that soybean production in the summer and grain production in the winter yielded better economic results compared with summer soybean and CLI in winter. This reflects the higher productivity of the crops (9.1%) and the improved chemical, physical, and biological attributes of the soil (with the exception of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop-livestock integration; Cost of production; Multivariate analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701165

The GT biplot analysis of green bean traits
Provedor de dados: 65
Autores: Oliveira,Tâmara Rebecca Albuquerque de; Gravina,Geraldo de Amaral; Oliveira,Gustavo Hugo Ferreira de; Araújo,Kleberson Cordeiro; Araújo,Lanusse Cordeiro de; Daher,Rogério Figueiredo; Vivas,Marcelo; Gravina,Lilia Marques; Cruz,Derivaldo Pureza da.
ABSTRACT: The green bean (Phaseolus vulgaris L.) is a nutrient-rich vegetable much appreciated; although, little studied, in Brazil. The aim of the current study was to investigate the nature of traits of interest, as well as to select plants for the green bean breeding program based on genotype vs. trait biplot analysis. The experiment followed a randomized block design, with 4 repetitions and 17 genotypes. Analysis of variance, principal component analysis and biplot charts were performed to analyze the number of pods per plant, the number of seeds per pod, the number of seeds per plant, seed weight per plant, 100-seed weight, as well as grain and pod yields. The analysis of variance showed genetic variability between genotypes. Grain yield, pod yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Multivariate analysis; Genotypes x traits.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600351

Genetic divergence among Nellore breed herds raised in the South Region of Brazil
Provedor de dados: 65
Autores: Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Weber,Tomás; Araújo,Ronyere Olegário de; Everling,Dionéia Magda; Bresolin,Tiago; Dornelles,Mariana de Almeida; Breda,Fernanda Cristina.
The objective of this study was to evaluate the genetic divergence among Nellore breed animals raised in 45 farms in the Southern Region of Brazil. The characteristic studied was weaning weight adjusted to 205 days of life (P205), from 10,874 animals sired by 425 bulls and 7,629 cows, collected between 1976 and 2001, and distributed in the states of Rio Grande do Sul (1,499), Santa Catarina (2,332) and Paraná (7,043). The animals were distributed by cluster analysis in eight genetic divergent groups, enabling this technique to be applied to organize the matings in order to obtain heterotic effect. The herd/farm groups were formed through the hierarchical Ward method, using the direct (VGD) and maternal (VGM) breeding values predicted by the REML method....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Genetic diversity; Multivariate analysis; Similarity; Ward hierarchical method.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000500020

Canonical correlation analysis applied to production and reproduction traits of meat type quails
Provedor de dados: 65
Autores: Ribeiro,Jeferson Corrêa; Silva,Luciano Pinheiro da; Caetano,Giovani da Costa; Crispim,Aline Camporez; Pacheco,Rodrigo de Oliveira; Torres,Robledo de Almeida.
ABSTRACT: Data from 629 meat type quails were used to study association between two different sets of traits: egg production and reproduction. Traits related to reproduction were: body weight at 42 days (W42), average egg weight (AEW), age at sexual maturity (ASM); and production traits: number of eggs produced from 42 until 182th day considering intervals of 35 days each period (P1, P2, P3 and P4). Canonical correlations were used to describe the association between these two sets of traits. The canonical coefficients indicated that egg production and reproductive traits were moderately related (0.3475). The first partial period of production (P1) and age at sexual maturity were the most relevant traits among the analyzed variables. Results show that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Canonical pairs; Coturnix coturnix; Egg production; Multivariate analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701289

Principal components for the in vivo and carcass conformations of Anglo-Nubian crossbred goats
Provedor de dados: 65
Autores: Ribeiro,Marta Jeidjane Borges; Pinto,Luís Fernando Batista; Barbosa,Ana Carla Borges; Santos,Gladston Rafael de Arruda; Pinto,Ana Paula Gomes; Nascimento,Carlos Souza do; Barbosa,Leandro Teixeira.
ABSTRACT: This study aimed to identify the principal components (PC) that explain the highest percentages of total variance and best characterize the in vivo and carcass morphologies of Anglo-Nubian crossbred goats. Nineteen carcass morphometric traits and six in vivo morphometric traits were measured in 28 kids at eight months of age. Principal component analysis indicated that five PC were able to explain 83.57% of the total variance in the 19 original carcass traits. Those components were termed PC1-Carcass Size, PC2 - Body Condition, PC3-Carcass Width, PC4-Chest Depth, and PC5 - Hindquarter. For in vivo morphometric traits, the first two principal components explained 78.86% of the total variance. These components were called PC1-In vivo Size and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass; Correlation; Multivariate analysis; Variance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600653

Multivariate analysis and neural networks application to price forecasting in the Brazilian agricultural market
Provedor de dados: 65
Autores: Pinheiro,Carlos Alberto Orge; Senna,Valter de.
ABSTRACT: The purpose of this study is to apply the methodology proposed by PINHEIRO &amp; SENNA (2015) to a set of agricultural products traded in Brazil. The multivariate and nonlinear character of this methodology has shown to be suitable, as compared to the neural network model, since it allows for a better predictive performance. Results obtained in an out-of-sample period, by using the calculated error and statistical test, confirmed this statement. This study will be useful to farmers as price forecasting based on their tendency is relevant.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neural networks; Multivariate analysis; Agricultural products; Forecasting.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100931

GENETIC DIVERSITY IN ARABICA COFFEE GROWN IN POTASSIUM-CONSTRAINED ENVIRONMENT
Provedor de dados: 64
Autores: Moura,Waldênia de Melo; Soares,Yaska Janaína Bastos; Júnior,Antônio Teixeira do Amaral; Lima,Paulo César de; Martinez,Hermínia Emília Prieto; Gravina,Geraldo de Amaral.
Potassium is a source of non-renewable natural resource, and is used in large quantities in coffee fertilization through basically imported formulations in the form of potassium chloride. An alternative to make production systems more sustainable would be obtaining cultivars more efficient in the use of this nutrient. This study aimed to evaluate the genetic diversity among 20 cultivars of coffee, in conditions of low availability of potassium to identify the best combinations for composing future populations to be used in breeding programs. The experiment was arranged in a randomized block design with three replications of nutrient solution. Agronomic characteristics and efficiencies of rooting, absorption, translocation, biomass production and potassium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea Arabica; Nutritional efficiency; K deficiency; Multivariate analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000100023

IDENTIFICATION OF IDEOTYPES BY CANONICAL ANALYSIS IN Panicum maximum
Provedor de dados: 64
Autores: Martuscello,Janaina Azevedo; Braz,Thiago Gomes dos Santos; Jank,Liana; Cunha,Daniel de Noronha Figueiredo Vieira da; Carvalho,Ana Luiza Silva.
Grouping of genotypes by canonical variable analysis is an important tool in breeding. It allows the grouping of individuals with similar characteristics that are associated with superior agronomic performance and may indicate the ideal profile of a plant for the region. The objective of the present study was to define, by canonical analysis, the agronomic profile of Panicum maximum plants adapted to the Agreste region. The experiment was conducted in a completely randomized design with 28 treatments, 22 genotypes of Panicum maximum, and cultivars Mombasa, Tanzania, Massai, Milenio, BRS Zuri, and BRS Tamani in triplicate in 4-m² plots. Plots were harvested five times and the following traits were evaluated: plant height; total, leaf, and stem; dead dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Breeding value; Agronomic performance; Leaf dry matter.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200147

GGE Biplot projection in discriminating the efficiency of popcorn lines to use nitrogen
Provedor de dados: 64
Autores: Santos,Adriano dos; Amaral Júnior,Antônio Teixeira do; Kurosawa,Railan do Nascimento Ferreira; Gerhardt,Ismael Fernando Schegoscheski; Fritsche Neto,Roberto.
ABSTRACT Nitrogen is essential for sustaining life on the planet, and it is the most important nutrient for obtaining high agricultural production. However, their use leads to the release of nitrous oxide with a global warming potential 296 times higher than the CO2 molecule, making it a challenge to reduce their use in agriculture. The objective of this research was to identify efficient popcorn inbred lines and responsive nitrogen use and exhibit a good expansion volume. For this, 29 inbred lines from the Germplasm Collection of Darcy Ribeiro North Fluminense State University (UENF) were evaluated at two contrasting levels of nitrogen availability (low and ideal) at two representative locations in the north and northwest of the state of Rio de Janeiro,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Multivariate analysis; Abiotic stress; G x E interaction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000100022

Parameters based on X-ray images to assess the physical and physiological quality of Leucaena leucocephala seeds
Provedor de dados: 64
Autores: Medeiros,André Dantas de; Araújo,Joyce de Oliveira; León,Manuel Jesús Zavala; Silva,Laércio Junio da; Dias,Denise Cunha Fernandes dos Santos.
ABSTRACT Non-destructive and high performance analyses are highly desirable and important for assessing the quality of forest seeds. The aim of this study was to relate parameters obtained from semi-automated analysis of radiographs of Leucaena leucocephala seeds to their physiological potential by means of multivariate analysis. To do so, seeds from five lots collected from parent trees from the region of Viçosa, MG, Brazil, were used. The study was carried out through analysis of radiographic images of seeds, from which the percentage of damaged seeds (predation and fungi), and measurements of area, perimeter, circularity, relative density, and integrated density of the seeds were obtained. After the X-ray test, the seeds were tested for germination in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest species; Image analysis; Multivariate analysis; Relative density; Seed radiography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000600643

FATTY ACID COMPOSITION OF Capsicum GENUS PEPPERS
Provedor de dados: 64
Autores: Sora,Gisele Teixeira de Souza; Souza,Aloisio Henrique Pereira; Zielinski,Acácio Antônio Ferreira; Haminiuk,Charles Windson Isidoro; Matsushita,Makoto; Peralta,Rosane Marina.
Fatty acids have a great metabolic and structural importance. Evaluation of fatty acid composition of peppers is still incomplete. Pulps and seeds from six varieties of the genus Capsicum were evaluated in this work with respect to their contents in fatty acids. A total of 25 different fatty acids, including some with odd number of carbons were identified in the samples. The most abundant fatty acids were palmitic (16:0), oleic (18:1n-9) and linoleic (18:2n-6) acids. The polyunsaturated:saturated fatty acid (PUFA/SFA) ratios for all peppers were high due to the elevated amounts of polyunsaturated acids, particularly linoleic acid. In the pulps, the omega-6/omega-3 ratios ranging from 1.28 to 4.33, were relatively adequate if one considers that ratios...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyunsaturated:saturated ratio; Omega-6/omega-3 ratio; Multivariate analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000400372

Measurement of genetic diversity in progenies of sour passion fruit by ward-mlm methodology: a strategy for heterotic group formation
Provedor de dados: 64
Autores: Silva,Fernando Higino de Lima e; Viana,Alexandre Pio; Ferreira,Rulfe Tavares; Freitas,Jôsie Cloviane de Oliveira; Santos,Jardel Oliveira; Rodrigues,Daniele Lima.
Passion fruit belongs to the family Passifloraceae, and the genus Passiflora is regarded the most economically important. The present study aimed to quantify genetic diversity among progenies of sour passion fruit, in order to define potential heterotic groups, based on morpho-agronomic descriptors, using the Ward-MLM procedure. It is useful for generation advancement in the passion fruit breeding program, via recurrent selection, under development at the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF). For such, 81 full-sib progenies belonging to the third recurrent selection cycle (C03) were assessed. Twenty-three descriptors were used, five of which were qualitative and 18, quantitative. The quantitative and qualitative variables were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis Sims.; Genetic variability; Multivariate analysis; Characterization of germplasm.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000300003