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Your search keyword '"Poppiel, Raul R."' showing total 17 results
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17 results on '"Poppiel, Raul R."'

5. The Use of Vis-NIR-SWIR Spectroscopy and X-ray Fluorescence in the Development of Predictive Models: A Step forward in the Quantification of Nitrogen, Total Organic Carbon and Humic Fractions in Ferralsols.

Author

Lima, Bruna Coelho de, Demattê, José A. M., Santos, Carlos H. dos, Tiritan, Carlos S., Poppiel, Raul R., Nanni, Marcos R., Falcioni, Renan, Oliveira, Caio A. de, Vedana, Nicole G., Zimmermann, Guilherme, and Reis, Amanda S.

Subjects
X-ray spectroscopy, MACHINE learning, FLUORESCENCE spectroscopy, X-ray fluorescence, SUPPORT vector machines
Abstract

The objective was to verify the performance of spectral techniques as well as validation models in the prediction of nitrogen, total organic carbon, and humic fractions under different cultivation conditions. Chemical analyses for the determination of nitrate, total nitrogen, total organic carbon, and the chemical fractionation of soil organic matter were performed, as well as spectral analyses by Vis-NIR-SWIR and X-ray fluorescence. The results of the spectroscopy were processed using RStudio v. 4.1.3, and PLSR and support vector machine learning algorithms were applied to validate the models. The Vis-NIR-SWIR and XRF spectroscopic techniques showed high performance and are indicated for the prediction of nitrogen, total organic carbon, and humic fractions in Ferralsols of medium sandy texture. However, it is important to highlight that each technique has its own characteristic mechanism of action: Vis-NIR-SWIR detects the element based on harmonic tones, while XRF is based on the atomic number of the element or elemental association. The PLSR and SVM models showed excellent validation results, allowing them to fit the experimental data, emphasizing that they are different statistical methods. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Point and Imaging Spectroscopy in Geospatial Analysis of Soils

Author

Rizzo, Rodnei, de Souza Mendes, Wanderson, Silvero, Nélida Elizabet Quiñonez, da Silva Terra, Fabricio, Dotto, André C., dos Santos, Natasha V., Bonfatti, Benito R., Poppiel, Raul R., Demattê, José A. M., Mitran, Tarik, editor, Meena, Ram Swaroop, editor, and Chakraborty, Abhishek, editor

Published
2021
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12. The Brazilian Soil Spectral Library (BSSL): A general view, application and challenges

Author

Demattê, José A.M., Dotto, André Carnieletto, Paiva, Ariane F.S., Sato, Marcus V., Dalmolin, Ricardo S.D., de Araújo, Maria do Socorro B., da Silva, Elisângela B., Nanni, Marcos R., ten Caten, Alexandre, Noronha, Norberto C., Lacerda, Marilusa P.C., de Araújo Filho, José Coelho, Rizzo, Rodnei, Bellinaso, Henrique, Francelino, Márcio R., Schaefer, Carlos E.G.R., Vicente, Luiz E., dos Santos, Uemeson J., de Sá Barretto Sampaio, Everardo V., Menezes, Rômulo S.C., de Souza, José João L.L., Abrahão, Walter A.P., Coelho, Ricardo M., Grego, Célia R., Lani, João L., Fernandes, Antonio R., Gonçalves, Deyvison A.M., Silva, Sérgio H.G., de Menezes, Michele D., Curi, Nilton, Couto, Eduardo G., dos Anjos, Lúcia H.C., Ceddia, Marcos B., Pinheiro, Érika F.M., Grunwald, Sabine, Vasques, Gustavo M., Marques Júnior, José, da Silva, Airon J., Barreto, Marcos C. de Vasconcelos, Nóbrega, Gabriel N., da Silva, Marcelo Z., de Souza, Sara F., Valladares, Gustavo S., Viana, João Herbert M., da Silva Terra, Fabricio, Horák-Terra, Ingrid, Fiorio, Peterson R., da Silva, Rafael C., Frade Júnior, Elizio F., Lima, Raimundo H.C., Alba, José M. Filippini, de Souza Junior, Valdomiro S., Brefin, Maria De Lourdes Mendonça Santos, Ruivo, Maria De Lourdes P., Ferreira, Tiago O., Brait, Marny A., Caetano, Norton R., Bringhenti, Idone, de Sousa Mendes, Wanderson, Safanelli, José L., Guimarães, Clécia C.B., Poppiel, Raul R., e Souza, Arnaldo Barros, Quesada, Carlos A., and do Couto, Hilton T. Zarate

Published
2019
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14. Point and Imaging Spectroscopy in Geospatial Analysis of Soils

Author

Rizzo, Rodnei, primary, de Souza Mendes, Wanderson, additional, Silvero, Nélida Elizabet Quiñonez, additional, da Silva Terra, Fabricio, additional, Dotto, André C., additional, dos Santos, Natasha V., additional, Bonfatti, Benito R., additional, Poppiel, Raul R., additional, and Demattê, José A. M., additional

Published
2020
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17. Passion Fruit Chlorotic Mottle Virus: Molecular Characterization of a New Divergent Geminivirus in Brazil.

Author

Fontenele, Rafaela S., Abreu, Rayane A., Lamas, Natalia S., Alves-Freitas, Dione M. T., Vidal, Andreza H., Poppiel, Raul R., Melo, Fernando L., Lacorte, Cristiano, Martin, Darren P., Campos, Magnolia A., Varsani, Arvind, and Ribeiro, Simone G.

Subjects
PASSION fruit, FRUIT genetics, DNA replication, ARABIDOPSIS thaliana, FRUIT disease & pest resistance
Abstract

Brazil is one of the major passion fruit producers worldwide. Viral diseases are among the most important constraints for passion fruit production. Here we identify and characterize a new passion fruit infecting-virus belonging to the family Geminiviridae: passion fruit chlorotic mottle virus (PCMoV). PCMoV is a divergent geminivirus unlike previously characterized passion fruit-infecting geminiviruses that belonged to the genus Begomovirus. Among the presently known geminiviruses, it is most closely related to, and shares ~62% genome-wide identity with citrus chlorotic dwarf associated virus (CCDaV) and camelia chlorotic dwarf associated virus (CaCDaV). The 3743 nt PCMoV genome encodes a capsid protein (CP) and replication-associated protein (Rep) that respectively share 56 and 60% amino acid identity with those encoded by CaCDaV. The CPs of PCMoV, CCDaV, and CaCDaV cluster with those of begomovirus whereas their Reps with those of becurtoviruses. Hence, these viruses likely represent a lineage of recombinant begomo-like and becurto-like ancestral viruses. Furthermore, PCMoV, CCDaV, and CaCDaV genomes are ~12–30% larger than monopartite geminiviruses and this is primarily due to the encoded movement protein (MP; 891–921 nt) and this MP is most closely related to that encoded by the DNA-B component of bipartite begomoviruses. Hence, PCMoV, CCDaV, and CaCDaV lineage of viruses may represent molecules in an intermediary step in the evolution of bipartite begomoviruses (~5.3 kb) from monopartite geminiviruses (~2.7–3 kb). An infectious clone of PCMoV systemically infected Nicotiana benthamina, Arabidopsis thaliana, and Passiflora edulis. [ABSTRACT FROM AUTHOR]

Published
2018
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