Abstract Wood is formed by the successive addition of secondary xylem, which consists cells with a conspicuously thickened wall composed mainly lignin and cellulose. Several genes involved in cellulose biosynthesis have been characterized, but factors that regulate formation walls woody tissues remain to be identified. In this study, we show plant-specific transcription factors, designated NAC SECONDARY WALL THICKENING PROMOTING FACTOR1 (NST1) NST3, are key regulators Arabidopsis thaliana....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCPMAS carbon-13 NMR analysis of the crystal transformation induced for Valonia cellulose by annealing at high temperaturesHiroyuki Yamamoto and Fumitaka HoriiCite this: Macromolecules 1993, 26, 6, 1313–1317Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/ma00058a020https://doi.org/10.1021/ma00058a020research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransformation of Valonia cellulose crystals by an alkaline hydrothermal treatmentJunji Sugiyama, Takeshi Okano, Hiroyuki Yamamoto, and Fumitaka HoriiCite this: Macromolecules 1990, 23, 12, 3196–3198Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://pubs.acs.org/doi/10.1021/ma00214a029https://doi.org/10.1021/ma00214a029research-articleACS PublicationsRequest reuse...

Summary— In order to clarify the role of microfibrils in generation growth stresses trees, an experimental analysis was carried out on 7 Appalachian hardwood species which were with or without gelatinous fiber upper region leaning stem.In that had fibers, large longitudinal tensile appeared where cross-sectional area layers large.In no fibers following relationships observed: (a) smaller microfibril angle, larger stress; (b) stress, α-cellulose content; (c) stress becomes as...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural changes of native cellulose crystals induced by annealing in aqueous alkaline and acidic solutions at high temperaturesHiroyuki Yamamoto, Fumitaka Horii, Hisashi OdaniCite this: Macromolecules 1989, 22, 10, 4130–4132Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published inissue 1 October 1989https://pubs.acs.org/doi/10.1021/ma00200a058https://doi.org/10.1021/ma00200a058research-articleACS...

Tree growth stress, resulted from the combined effects of dead weight increase and cell wall maturation in growing trees, fulfills biomechanical functions by enhancing strength stems controlling their orientation. Its value after new wood formation, named can be determined measuring instantaneously released strain at stem periphery. Exceptional levels longitudinal stress are reached reaction wood, form compression gymnosperms or higher-than-usual tension angiosperms, inspiring theories to...

Wood behavior is characterized by high sensibility to humidity and strongly anisotropic properties. The drying shrinkage along the fibers, usually small due reinforcing action of cellulosic microfibrils, surprisingly in so-called tension wood, produced trees respond strong reorientation requirements. In this study, nitrogen adsorption–desorption isotherms supercritically dried wood normal show that cell wall has a gel-like structure pore surface more than 30 times higher wood. Syneresis gel...

This work was undertaken to investigate the feasibility of near-infrared (NIR) spectroscopy for estimating wood mechanical properties, i.e., modulus elasticity (MOE) and rupture (MOR) in bending tests. Two sample sets having large limited density variation were prepared examine effects on estimation MOE MOR by NIR technique. Partial least squares (PLS) analysis employed it found that relationships between laboratory-measured NIR-predicted values good case variation. could be estimated even...

Biomass is nowadays a very important alternative to energy consumption, since it provides less environmental harms. Briquettes come as an option they include logistical and efficiency advantages. This study aimed characterize Leucaena leucocephala (leucena) Gonoacantha piptadenia (pau-jacaré) biomass, define their potential verify the briquettes' moisture content mechanical resistance. Six treatments were provided: 2 species three different contents (10%, 12% 15%). Fifteen briquettes...

The activity of lipoxygenase (LOX) in aged potato tuber discs increased by almost 2-fold following treatment the with fungal elicitor arachidonic acid (AA). Enzyme above that untreated within 30 min after AA treatment, peaked at 1 to 3 h, and returned near control levels 6 h. majority was detected a soluble fraction (105,000g supernatant), but minor portion also associated particulate enriched microsomal membranes pellet); both activities were similarly induced. 5-Hydroperoxyeicosatetraenoic...