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Showing 1 to 14 of 14 for “"CELLULOSE CRYSTALLINITY"”.
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Investigação de redução da cristalinidade da celulose sob a influência de diferentes misturas eutéticas.
Since cellulose is a biodegradable raw material that is practically inexhaustible, it has been the subject of several studies in order to find alternative applications to conventional raw materials. Its derivatization on an industrial scale occurs mostly through heterogeneous reactions, which …
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Forward screening for herbicide resistance in Arabidopsis thaliana and the monocot species Triticum aestivum
Cellulose is the primary structural component of plant cell walls and is composed of β-1,4-glucan chains. The cellulose synthesis complex is composed of multiple cellulose synthases (CESAs), which work together to extend the cellulose molecule. Although extensively studied, cellulose biosynthesis …
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Mechanical Performance of Industrial Hemp Fibre Reinforced Polylactide and Unsaturated Polyester Composites
… was believed to be as a result of increased cellulose crystallinity. In contrast, the average tensile strength of acetic anhydride, maleic anhydride and silane treated fibres slightly decreased compared with that of untreated fibres, which was believed to be as a result of decreased cellulose …
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Characterization of novel genetic alleles of cellulose synthase
Cellulose is the most abundant polymer on earth. Despite this, relatively little is known about the proteins and biochemical mechanisms governing cellulose biosynthesis. Only in the past 10 years since the sequencing of the Arabidopsis thaliana genome have we begun to unravel the full complexity of …
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Forward genetic analysis of cellulose biosynthesis inhibitor resistance and wall hydrolysis sensitivity.
The functional analysis of components involved in cellulose biosynthesis is central in understanding cell wall assembly and structure in plants. We conducted screens using the herbicides, isoxaben and flupoxam which inhibit cellulose biosynthesis in higher plants. Mutations resulting in a high …
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Reducing cell wall recalcitrance in poplar through overexpression of cell wall degrading enzymes
<p>Abundant cellulose in the secondary cell walls of lignocellulosic biomass provides an alternative source of carbohydrates for ethanol production. However, low efficiency and high cost of conversion of cellulose to glucose prevents the large-scale production of economically viable cellulosic …
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Chemical composition and fiber structure as factors affecting fiber fermentation
… nuclear magnetic resonance analyses, a change in cellulose crystallinity as a result of fermentation was not apparent. Based on changes which occurred as the byproducts were fermented, we concluded that lignin encrustation was a factor inhibiting the fermentation of both CSH and OH. …
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Ethanol from photoperiod-sensitive sorghum: a study on biomass structure and process optimization
… to utilize both the structural polysaccharide (cellulose) and the soluble sugar (sucrose, glucose, and fructose) for fermentation. Response surface methodology was employed to optimize the pretreatment condition for maximizing the cellulose-glucose conversion. Simultaneous enzymatic hydrolysis …
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Modification of Wood Fiber with Thermoplastics by Reactive Steam-Explosion
… to adsorption of amphiphilic polymers to the cellulose fiber surface, which is one hypothesis of fiber surface modification by co-steam-explosion. Microscopy studies revealed that PO melt viscosity was found to influence the degree of dispersion and uniformity of the steam-exploded material. …
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Pulsed electric field pretreatment of lignocellulose biomass for maximum fermentable sugar yield
… the flax straw pre and post-pretreatment, while crystallinity index measurements revealed unchanged cellulose crystallinity due to PEF pretreatment. Scanning electron microscopy (SEM) images displayed a more porous surface in the pretreated flax straw. BET analysis demonstrated a 91% increase in …
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Membrane Processes for Sustainable Energy Applications
… pretreatment of the biomass to hydrolyze hemi-cellulose, separate lignin and reduce cellulose crystallinity. During the pretreatment by dilute acid hydrolysis (or other method of hydrolysis), several grams of acetic acid per liter of hydrolysate are generated. Acetic acid needs to be removed …
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ΜΕΛΕΤΗ ΠΡΟΚΑΤΕΡΓΑΣΙΩΝ ΓΙΑ ΤΗ ΒΕΛΤΙΩΣΗ ΤΗΣ ΟΞΙΝΗΣ ΥΔΡΟΛΥΣΗΣ ΚΥΤΤΑΡΙΝΟΥΧΩΝ ΥΛΙΚΩΝ
… THE MODEL TAKES INTO ACCOUNT THE DEGREE OF CRYSTALLINITY OF CELLULOSE AND THE PRESENCE OF WATER SOLUBLE OLIGOSACCHARIDES IN THE HYDROLYSATE.
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Understanding the Role of Biomass and High Shear Bioreactor Parameters in Bioethanol Production
… on earth. Biomass generally contains 60-70% of cellulose and hemicellulose,which are not readily available for enzymatic hydrolysis, and hence, the pretreatment step, one of the most expensive steps in the conversion of biomass to biofuel, becomes inevitable. The purposes of pretreatment are to …
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Structural colour from a helicoidal cellulose architecture in the secondary cell wall: Optical properties, cell wall composition, structure and morphology of components, and their assembly and interactions.
… structural coloration consists of assembling cellulose microfibrils into helicoidal structures. Examples of these architectures can be found in phylogenetically distant species and in different tissues of plants, such as in the endocarp of the fruit of $\textit{Margaritaria nobilis}$, an …