نتایج جستجو برای: eucalyptus pulp

تعداد نتایج: 27596  

2007
Anderson Guerra Lucian A. Lucia Dimitris S. Argyropoulos

Despite the growing importance of Eucalyptus wood as raw material for pulp and paper, there is a lack of knowledge on the chemistry of their macromolecular components. The present paper addresses this issue by applying the recently developed protocol for isolating enzymatic mild acidolysis lignins (EMAL) from Eucalyptus grandis, Eucalyptus globulus and the softwood species Douglas fir and white...

2011
Jorge Lepikson-Neto Leandro Nascimento Maria Carolina Scatollin Wesley Marques Marcela Salazar Eduardo Camargo Ramon Vidal Danieli Gonçalves Goncalo Pereira

Background The flavonoids, naringenin-chalcone and narigenin, are intermediates in phenylpropanoid metabolism in plants, occupying the central position as primary intermediates in flavonoid biosynthesis and are synthesized by chalcone synthase (CHS) and chalcone isomerase (CHI) respectively.[1] It has been reported that supplementation of narigenin-chalcone and narigenin can inhibit the activit...

2005
Pedro W. Crous Johannes Z. Groenewald J. Pedro Mansilla Gavin C. Hunter Michael J. Wing

Species of Eucalyptus, mostly native to Australia, are widely planted as exotics in the tropics and Southern Hemisphere. These plantations represent an important source of fuel-wood, structural timber and pulp. Eucalyptus plantations are, however, vulnerable to infection by pathogens, including Mycosphaerella spp. and their anamorphs, which have caused substantial damage, in many parts of the w...

2011
Maria E. Eugenio Manuel Hernández Raquel Moya Raquel Martín-Sampedro Juan C. Villar Enriqueta Arias

The aim of this work is to prove the suitability of a new alkaline and halotolerant bacterial laccase (SilA) produced by Streptomyces ipomoea CECT 3341 to enhance the conventional chemical bleaching process of an industrial eucalyptus kraft pulp. The laccase used for this study was a recombinant laccase obtained from cultures of E. coli BL21 (DE3) grown in LB liquid medium. The biobleaching exp...

2010
Swarnima Agnihotri Dharm Dutt C. H. Tyagi

Bagasse from early species of Saccharum officinerum-Co 89003 has 71.36% useful, long, and thick-walled fibers with good slenderness ratio, but the rigidity coefficient is less than that of Eucalyptus tereticornis and Leucaena leucocephala. The kink index and kink per mm length are lower in bagasse fiber than E. terticornis, which gives rise to fewer weak points in the fiber. Low alcohol–benzene...

2012
Marelize van Wyk Jolanda Roux Gilbert Kamgan Nkuekam Brenda D. Wingfield Michael J. Wingfield

Eucalyptus trees, mostly native to Australia, are widely planted in the tropics and Southern Hemisphere for the production of wood and pulp. Worldwide surveys of diseases on these trees have yielded a large collection of Ceratocystis isolates from dying trees or from wounds on their stems. The aim of this study was to characterise these isolates and to consider their relatedness to each other. ...

2015
Fátima Vargas Zoilo González Orlando Rojas Gil Garrote Alejandro Rodríguez

The present study shows that barley straw (Hordeum vulgare) can be a supplementary raw material of softwoods and hardwoods such as Pinus sylvestris and Eucalyptus camaldulensis, respectively, for the production of cellulose and paper, reducing an agricultural residue that has no added value. Barley straw has a lower content of cellulose at 36.4% than P. sylvestris and E. camaldulensis, but it c...

2007
Qifeng Yang Huaiyu Zhan Shuangfei Wang Shiyu Fu Kecheng Li

Modification of chemithermomechanical pulp (CTMP) by fungal treatment was investigated. Eucalyptus CTMP was treated with three different types of white-rot fungi, namely, Phanerochaete chrysosporium (P.c1767), Trametes hirsute 19-6 (T.h-19-6), and Trametes hirsute19-6w (T.h-19-6w), under a stationary culture condition. Pulp total weight loss, lignin loss, and cellulose loss were determined to c...

2008
Flaviano O. Silvério Luiz C. A. Barbosa Célia R. A. Maltha Armando J. D. Silvestre Dorila Pilo-Veloso José L. Gomide

The chemical compositions of the lipophilic extractives from four clones of Eucalyptus urograndis cultivated in Brazil were studied by gas chromatography-mass spectrometry (GC-MS) before and after alkaline hydrolysis. The four E. urograndis clones showed similar amounts of dichloromethane soluble (lipophilic) extractives (0.38-0.55% w/w). The major groups of compounds identified in the lipophil...

2006
Juergen Puls Ron Janzon Bodo Saake

Xylans were selectively removed from paper grade pulps by nitren extraction in order to produce dissolving pulps. The impact of nitren charge on the removal of hemicelluloses was demonstrated for a birch and mixed softwood kraft pulp. The 95% purity level could easily be reached for the birch kraft pulp. Softwood glucomannans were almost insoluble under the investigated extraction conditions ap...

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