Results 11 to 20 of about 12,778 (205)

Lignina em espumas fenólicas [PDF]

Polímeros, 1999
A lignina extraída do bagaço de cana de açúcar pode substituir parcialmente o fenol na preparação de resinas fenólicas. Este trabalho aborda a aplicação de pré-polímero resólico, sendo que o fenol foi parcialmente substituído por lignina (25%, massa lignina/massa fenol ), visando a obtenção de material com características de plástico celular.
Carvalho, Gil de, Frollini, Elisabete
openaire   +4 more sources

DEPOLIMERIZACIÓN DE LIGNINA:

Revista Centro Azúcar, 2014
En el tratamiento químico de los materiales lignocelulósicos para obtener celulosa se  genera un residuo denominado lignina. Este polímero se ha convertido en un producto  atractivo por constituir una fuente potencial de precursores de alto valor ...
Yelenys Hernández Corvo, Daisy Dopico Ramírez, Eduardo Bordallo López   +2 more
doaj   +1 more source

Complete Extruded Diet: How Does Equine Fecal Microbiota Change During Intake Adaptation? [PDF]

Anim Sci J
ABSTRACT This study aimed to investigate the gradual adaptation of the fecal bacterial community and in vitro fermentative capacity of horses fed a complete extruded diet (CED). Twelve geldings weighing 370 kg were removed from a native pasture and fed coastcross hay (Cynodon spp) for 7 days.
Franzan BC, da Silva Coelho I, Ramos EM, de Souza ARP, de Almeida FQ, Silva VP.   +5 more
europepmc   +2 more sources

Assessment of genetically modified soybean 40-3-2 for renewal authorisation under Regulation (EC) No 1829/2003 (application EFSA-GMO-RX-023). [PDF]

EFSA J, 2022
Abstract Following the submission of application EFSA‐GMO‐RX‐023 under Regulation (EC) No 1829/2003 from Bayer Agriculture BV on behalf of Bayer CropScience LP, the Panel on Genetically Modified Organisms of the European Food Safety Authority was asked to deliver a scientific risk assessment on the data submitted in the context of the renewal of ...
EFSA Panel on Genetically Modified Organisms (GMO), Mullins E, Bresson JL, Dalmay T, Dewhurst IC, Epstein MM, Firbank LG, Guerche P, Hejatko J, Moreno FJ, Naegeli H, Nogué F, Rostoks N, Sánchez Serrano JJ, Savoini G, Veromann E, Veronesi F, Camargo AM, Goumperis T, Lenzi P, Lewandowska A, Raffaello T, Streissl F.   +22 more
europepmc   +2 more sources

Physiological roles of lignins - tuning cell wall hygroscopy and biomechanics. [PDF]

New Phytol
Summary Lignins constitute the second most abundant carbon‐storing biopolymers in the biosphere. These phenolic polymers accumulate in different concentrations, compositions, and localisations within and between cell wall layers and cell types. Lignins were acquired during plant terrestrialisation 450 million years ago, and the diversification of their
Pesquet E, Cesarino I, Kajita S, Pawlowski K.   +3 more
europepmc   +2 more sources

Foliar spectral signatures reveal adaptive divergence in live oaks (Quercus section Virentes) across species and environmental niches. [PDF]

New Phytol
Summary Genomic tools have advanced our understanding of species and population structure, but distinguishing neutral from adaptive evolution remains challenging due to limited methods for measuring a broad spectrum of phenotypic traits. We used spectroscopic data from preserved leaves to test for adaptive divergence among populations of live oaks ...
Hernández-Leal MS, Guzmán Q JA, González-Rodríguez A, Cavender-Bares J.   +3 more
europepmc   +2 more sources

Biochemical composition of cover crop residues determines water retention and rewetting characteristics

Agronomy Journal, Volume 115, Issue 6, Page 3173-3187, November/December 2023., 2023
Abstract When cover crop residues are left on the soil surface, their decomposition is mainly influenced by environmental conditions in residue layers, particularly residue water potential (ψresidue). Thus, models for surface residue decomposition in conservation tillage systems should include a sub‐module that can simulate hourly changes in ψresidue ...
Carley Meeks, Miguel Cabrera, Resham Thapa, Nadia Noor, Steven Mirsky, Chris Reberg‐Horton   +5 more
wiley   +1 more source

In Situ Lignin Sulfonation for Highly Conductive Wood/Polypyrrole Porous Composites

Advanced Materials Interfaces, Volume 10, Issue 1, January 5, 2023., 2023
A facile approach for the fabrication of porous lightweight and mechanical robust wood/polypyrrole composites with high conductivity is demonstrated. The in situ lignin sulfonation approach for native wood structure as a multifunctional platform is advantageous for controlled and improved conductive polymer integration toward sustainable and low‐cost ...
Gabriella G. Mastantuoni, Van Chinh Tran, Isak Engquist, Lars A. Berglund, Qi Zhou   +4 more
wiley   +1 more source

A model for the pyrolysis of two Nordic structural timbers

Fire and Materials, Volume 46, Issue 1, Page 55-68, January/February 2022., 2022
SUMMARY Performance‐based design of the timber structures' fire resistance is often based on the reduced cross section and thus relying on empirical and numerical assessment of the charring propagation. The current work aims to construct models for the pyrolysis of spruce and pinewoods to allow coupled simulations of the cross‐section reduction and ...
Aleksi Rinta‐Paavola, Simo Hostikka
wiley   +1 more source

Sintesi di polioli da scarti mediante processo di liquefazione a microonde [PDF]

, 2022
La tesi ha come obiettivo la produzione di polioli mediante liquefazione della lignina. Si è indagato, principalmente, sull'effetto del solvente di liquefazione, utilizzando solventi da fonte rinnovabile, e sulla catalisi, utilizzando sia catalizzatore ...
Catini, Lorenza
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