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Dive into the research topics where John J. Tomashek is active.

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Featured researches published by John J. Tomashek.


Holzforschung | 2009

Selective enzyme impregnation of chips to reduce specific refining energy in alkaline peroxide mechanical pulping.

Peter W. Hart; Darrell M. Waite; Luc Thibault; John J. Tomashek; Marie-Eve Rousseau; Christopher Hill; Marc Sabourin

Abstract Eucalyptus wood chips were impregnated with various blends of fiber modifying enzymes prior to preconditioning refiner chemical-alkaline peroxide mechanical pulp processing. The process includes chemical pretreatment and two stages of refining. The energy consumption was compared at the same Canadian standard freeness level of 350 ml. Some enzyme treatments were found to reduce specific refining energy (SRE) by at least 24%. The enzyme hydrolysis within the cell wall was observed by transmission electron microscopy of impregnated chips with high spatial resolution. The enzyme blends that successfully reduced SRE requirements were found to selectively loosen the bonds between the S1 and S2 layers of the fiber wall. Enzymes which selectively attached the S2 layer did not impart any SRE reduction. All experiments for impregnation and pulp processing were conducted at the Andritz Pilot Plant in Springfield, OH.


Archive | 2008

Enzymatic hydrolysis of lignocellulosic feedstocks using accessory enzymes

Brian R. Scott; Christopher Hill; John J. Tomashek; Chengsong Liu


Archive | 2007

Process for enzymatic hydrolysis of pretreated lignocellulosic feedstocks

Christopher Hill; Brian R. Scott; John J. Tomashek


Archive | 2012

Cellulase Enzyme Mixtures For Depilling and Uses Thereof

Christopher Hill; John J. Tomashek; Loreta Gudynaite-Savitch; Guylaine Therrien; Sophie Calixte


Archive | 2009

Modified beta-glucosidases with improved stability

Christopher Hill; James Lavigne; Martine Whissel; John J. Tomashek


Archive | 2009

Cellulase variants with reduced inhibition by glucose

James Lavigne; Christopher Hill; Annie Tremblay; Patrick St-Pierre; John J. Tomashek


Archive | 2010

NOVEL LIGNIN-RESISTANT CELLULASE ENZYMES

Brian R. Scott; Patrick St-Pierre; James Lavigne; Nabil Masri; Theresa C. White; John J. Tomashek


Archive | 2010

Novel beta-glucosidase enzymes

Brian R. Scott; Chengsong Liu; James Lavigne; John J. Tomashek


Archive | 2012

Novel cellobiohydrolase enzymes

Jacqueline Montalibet; Loreta Gudynaite-Savitch; Christopher Hill; Christopher D. Hindle; James Lavigne; Nabil Masri; Fuad Tahna; John J. Tomashek


Archive | 2009

Family 6 cellulase with decreased inactivation by lignin

James Lavigne; Brian R. Scott; Martine Whissel; John J. Tomashek

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