Deslignificação organossolve/dioxido de carbono de Eucalyptus urograndis em condições sub e supercriticas

2001 ◽  
Author(s):  
Luiz Henrique Ferreira
Keyword(s):  
Eucalyptus Urograndis

scholarly journals Caracterização das O-acetil-(4-O-metilglicurono)xilanas isoladas da madeira de Eucalyptus urograndis

Química Nova ◽  
2008 ◽  
Vol 31 (5) ◽  
pp. 1085-1088 ◽  
Author(s):  
Andréia da Silva Magaton ◽  
Dorila Piló-Veloso ◽  
Jorge Luiz Colodette
Keyword(s):  
Eucalyptus Urograndis

scholarly journals Solubility parameters analysis of Eucalyptus urograndis kraft lignin

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8577-8600
Author(s):  
William C. O. Ribeiro ◽  
Vinícius Lobosco ◽  
Patrícia F. M. Martinez
Keyword(s):  
Organic Solvents ◽  
Kraft Lignin ◽  
Added Value ◽  
Solubility Parameters ◽  
Direct Production ◽  
Solvent Fractionation ◽  
Statistical Relevance ◽  
Wide Range ◽  
Effective Development ◽  
Eucalyptus Urograndis

Lignin has gained momentum as a renewable material because it is the largest natural source that can provide aromatic compounds in a wide range of applications. However, its heterogeneity in terms of high polydispersity molar mass distribution and variety of functional groups has limited the direct production of added-value lignin-derivatives. Among the alternatives to obtain more homogeneous lignin cuts is solvent fractionation. However, it is not well understood how different solvents influence lignin partition, and thus it is difficult to establish a rational solvent order to perform it. Thus, the purpose of this work was to understand Eucalyptus urograndis kraft lignin partition in organic solvents through the application of three solubility parameter theories: Hildebrand, Hansen (HSP), and Functional (FSP). Through the theories studied, FSP provided the best representation of lignin partition in organic solvents. In addition, the influence of solvents’ solubility parameters on lignin solubility was investigated by multiregression analyses, which revealed that only the polar solvent parameter showed statistical relevance to describe lignin solubility. The results of this work may contribute to the effective development of technical lignins’ fractionation, allowing the production of higher-value lignin derivatives, increasing the profitability of biorefineries, and establishing a sustainable bio-based economy.

scholarly journals Initial Development of Eucalyptus According to Different Desiccation Periods of Signalgrass

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
Y. GRAAT ◽  
A.L. BACHA ◽  
M.P. NEPOMUCENO ◽  
P.L.C.A. ALVES
Keyword(s):  
Dry Matter ◽  
Control Sample ◽  
Experimental Period ◽  
Initial Development ◽  
Randomized Design ◽  
Urochloa Decumbens ◽  
Completely Randomized Design ◽  
Red Latosol ◽  
Eucalyptus Urograndis ◽  
Herbicide Glyphosate

ABSTRACT: This study aimed at evaluating the effects of different desiccation periods of Urochloa decumbens on the initial development of Eucalyptus urograndis (clone C-219H). The experiment was conducted in 100 liter concrete boxes, previously filled with Dark-Red Latosol. U. decumbens was sown in all plots, except for the control sample without covering. After 95 days from sowing, the herbicide glyphosate (dose of 1,424 g a.e. ha-1) was sprayed at intervals of 0 (Apply-Plant), 7, 14, 21, 28 and 35 days before eucalyptus planting, plus a control sample without covering, totaling seven treatments. A completely randomized design with six replications was used. Eucalyptus plants were evaluated 30, 60 and 90 days after planting (DAP), when the height of the plants and the diameter of the stem were determined. At the end of the experimental period (90 DAP), the leaf area and the dry matter of leaves and stem were measured. It is possible to conclude that the Apply-Plant modality was harmful to some of the eucalyptus characteristics (E. urograndis - C-219H), while planting the seedlings in periods over 14 days after the desiccation of U. decumbens plants promoted a better development of the culture.

scholarly journals Effect of increasing densities of Urochloa brizantha cv. Marandu on Eucalyptus urograndis initial development in silvopastoral system

2018 ◽  
Vol 30 (2) ◽  
pp. 537-543 ◽  
Author(s):  
Michel Anderson Almeida Colmanetti ◽  
Allan Lopes Bacha ◽  
Pedro Luis da Costa Aguiar Alves ◽  
Rinaldo Cesar de Paula
Keyword(s):  
Silvopastoral System ◽  
Initial Development ◽  
Urochloa Brizantha ◽  
Eucalyptus Urograndis

Physiological characteristics and forage accumulation of grazed Marandu palisade grass (Brachiaria brizantha) growing in monoculture and in silvopasture with Eucalyptus urograndis

2019 ◽  
Vol 70 (4) ◽  
pp. 384 ◽  
Author(s):  
H. L. B. do Nascimento ◽  
B. C. Pedreira ◽  
L. E. Sollenberger ◽  
D. H. Pereira ◽  
C. A. de S. Magalhães ◽  
...  
Keyword(s):  
Transpiration Rate ◽  
Brazilian Amazon ◽  
Agroforestry Systems ◽  
Physiological Characteristics ◽  
Experimental Unit ◽  
Row Spacing ◽  
Brachiaria Brizantha ◽  
Unit Space ◽  
Proper Design ◽  
Eucalyptus Urograndis

Adoption of silvopasture is increasing, but proper design and management of pasture–tree associations is required to sustain pasture productivity. Our objective was to compare agronomic and physiological characteristics of Brachiaria brizantha (Hochst. Ex A.Rich.) Stapf. (palisade grass) cv. Marandu growing in monoculture, or in silvopasture with Eucalyptus urograndis, in the Brazilian Amazon biome. Trees were planted in triple rows (intra-row spacing 3 m, inter-row spacing 3.5 m), referred to as a grove, with three groves per 2-ha silvopasture experimental unit. Space between groves was 30 m, and tree density was 270 ha–1. From October 2015 to September 2016, all experimental units were stocked continuously with cattle by using a variable stocking rate to maintain a Marandu canopy height of 30 cm. In the silvopasture, sampling occurred at 4, 7.5 and 15 m into the non-treed area from the outer tree row in a grove. Photosynthetically active radiation (PAR) reaching the Marandu canopy averaged 21% less for silvopasture than for grass monoculture; however, forage accumulation was not different between systems, nor were Marandu stomatal conductance, water-use efficiency (WUE), transpiration rate, transpiration ratio and leaf temperature. In silvopasture, PAR and forage accumulation were 33% and 29% less, respectively, at the 4-m distance than the 15-m distance from the edge row of trees, associated with lower transpiration rate and transpiration rate and greater WUE. We conclude that Marandu palisade grass can tolerate PAR reduction in silvopasture up to ~20% without reduction in forage accumulation, supporting its potential use in agroforestry systems for cattle production in the Brazilian Amazon Biome.

Pyroligneous acid from Mimosa tenuiflora and Eucalyptus urograndis as an antimicrobial in dairy goats

2021 ◽  
Author(s):  
W.N.C. Soares ◽  
G.P.O. Lira ◽  
C.S. Santos ◽  
G.N. Dias ◽  
A.S. Pimenta ◽  
...  
Keyword(s):  
Dairy Goats ◽  
Pyroligneous Acid ◽  
Eucalyptus Urograndis ◽  
Mimosa Tenuiflora

scholarly journals The Allelopathic Effect of Eucalyptus Leaf Extract on Grass Forage Seed

2015 ◽  
Vol 33 (2) ◽  
pp. 193-201 ◽  
Author(s):  
F.P. Carvalho ◽  
C.A.D. Melo ◽  
M.S. Machado ◽  
D.C.F.S. Dias ◽  
E.M. Alvarenga
Keyword(s):  
Leaf Extract ◽  
Allelopathic Effect ◽  
Panicum Maximum ◽  
Allelopathic Potential ◽  
Eucalyptus Leaves ◽  
Randomized Design ◽  
Urochloa Decumbens ◽  
Completely Randomized Design ◽  
Germination Vigor ◽  
Eucalyptus Urograndis

This study aimed to evaluate the allelopathic effect of various concentrations of an aqueous extract of eucalyptus leaves on Urochloa decumbens and Panicum maximum seeds. The extract was prepared from Eucalyptus urograndis leaves that were milled and mixed with distilled water in a 1:9 milled leaves: water ratio to obtain an extract with a defined concentration of 100%. In addition, dilutions of 50%, 25% and 12.5% were prepared, and a 0% dilution was used as a control. The experiment followed a completely randomized design, with four replicates, each of 50 seeds of U. decumbens and 50 seeds of P. maximum, arranged on filter paper moistened with each concentration of extract in a Gerbox plastic box. The results demonstrated the allelopathic potential of E. urograndis aqueous extracts applied to the seeds of U. decumbens and P. maximum. The 50% and 100% concentrations of leaf extract most strongly inhibited the germination, vigor and seedling growth of U. decumbens and P. maximum. The germination speed index and the root length were the characteristics that were most affected by the potentially allelopathic substances contained in the eucalyptus extracts at all concentrations.

Py-GC/MS Analysis on Bioenergy Resource of Eucalyptus Urograndis Wood

2009 ◽  
Author(s):  
Wan-Xi Peng ◽  
Yi-Qiang Wu ◽  
Hong-Chen Qi ◽  
Yun-Yun Peng ◽  
Shu-Bin Wu
Keyword(s):  
Ms Analysis ◽  
Eucalyptus Urograndis

scholarly journals INFLUÊNCIA DA IDADE DE CORTE DE CLONES DE Eucalyptus grandis E HÍBRIDOS DE Eucalyptus grandis x Eucalyptus urophylla NA COMPOSIÇÃO QUÍMICA DA MADEIRA E POLPAÇÃO KRAFT

2017 ◽  
Vol 27 (1) ◽  
pp. 237 ◽  
Author(s):  
Paulo Henrique Damasceno de Morais ◽  
Dalton Longue Júnior ◽  
Jorge Luiz Colodette ◽  
Elisa Helena da Costa Morais ◽  
Carolina Marangon Jardim
Keyword(s):  
Eucalyptus Grandis ◽  
Eucalyptus Urophylla ◽  
Eucalyptus Urograndis

Os recentes esforços na melhoria da qualidade da madeira para o abastecimento das fábricas de celulose e papel têm focado em muitos pontos, dentre estes, a influência das características químicas da matéria-prima no processo produtivo e na qualidade do produto final. Considerando a atual demanda por árvores mais jovens, o efeito da idade de corte da madeira na composição química e nas variáveis de processo, torna-se uma questão importante para as indústrias do setor. Em função disto, o objetivo do presente estudo foi caracterizar clones de eucalipto, Eucalyptus grandis e híbridos Eucalyptus urograndis, ambos em diferentes idades de corte (1 a 8 anos) quanto às suas composições químicas e parâmetros de polpação kraft. Ambas as composições químicas das madeiras mostraram variações estatísticas significativas devido às suas diferentes idades de corte. O teor de glicanas, assim como o teor de celulose, densidade básica e extrativos, aumentaram com o aumento da idade de corte das árvores, enquanto o teor de xilanas e demais carboidratos que compõem as hemicelulose, tenderam a diminuir com o aumento da idade de corte, assim como os ácidos urônicos, grupos acetila, lignina, cinzas e relação S:G da lignina da madeira. As amostras com 5 anos de idade mostraram o melhor rendimento na polpação kraft para número kappa 17, e este rendimento (número kappa 17) mostrou forte correlação com o teor de glicanas.

scholarly journals Conteúdo de nutrientes na serapilheira em três fisionomias do Cerrado do Distrito Federal

2017 ◽  
Vol 37 (92) ◽  
pp. 465-473 ◽  
Author(s):  
Fabiana Piontekowski Ribeiro ◽  
Angela Pereira Bussinguer ◽  
Barbara Elias Reis Hodecker ◽  
Alcides Gatto
Keyword(s):  
Distrito Federal ◽  
Eucalyptus Urograndis

O estudo foi realizado na Fazenda Água Limpa, DF, em três fisionomias: Cerrado típico, mata de galeria e povoamento de Eucalyptus urograndis, e teve por objetivo analisar o conteúdo de macro e micronutrientes via estoque de serapilheira, durante as épocas seca e chuvosa. Procedeu-se a coleta mensal de serapilheira no período de setembro de 2011 a agosto de 2012. As amostras foram coletadas aleatoriamente, com três repetições em cada fisionomia sendo secas para posterior determinação dos teores de nutrientes. Os resultados foram avaliados por análise de variância, teste de Tukey e correlação de Pearson. Os conteúdos de macronutrientes no estoque de serapilheira na Mata de Galeria e eucalipto apresentaram-se na ordem de N > Ca > K > Mg > S > P no período chuvoso, e no seco o S foi superior ao Mg para o eucalipto, não sendo observada alteração na Mata de Galeria. No Cerrado típico, a ordem foi N > Ca > S > Mg > K > P no período chuvoso, alterando para N > Ca > K > S > Mg > P no período seco.

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