Determination of kinetic parameters of fermentation processes by a continuous unsteady-state method: application to the alcoholic fermentation of D-xylose by Pichia stipitis.

abstract：:The enzyme cellulase, a multienzyme complex made up of several proteins, catalyzes the conversion of cellulose to glucose in an enzymatic hydrolysis-based biomass-to-ethanol process. Production of cellulase enzyme proteins in large quantities using the fungus Trichoderma reesei requires understanding the dynamics of g...

journal_title：Biotechnology and bioengineering

authors： Tholudur A,Ramirez WF,McMillan JD

更新日期：1999-01-01 00:00:00

abstract：:Steady-state simulations using our previously developed structured kinetic model of antibody synthesis and secretion by hybridoma cells are used here in conjunction with factorial design analysis to identify intracellular parameters important in determining the specific antibody secretion rate and predict the dependen...

journal_title：Biotechnology and bioengineering

authors： Bibila TA,Flickinger MC

更新日期：1992-02-05 00:00:00

abstract：:Membrane chromatography (MC) systems are finding increasing use in downstream processing trains for therapeutic proteins due to the unique mass-transfer characteristics they provide. As a result, there is increased need for model-based methods to scale-up MC units using data collected on a scaled-down unit. Here, a st...

journal_title：Biotechnology and bioengineering

authors： Ghosh P,Lin M,Vogel JH,Choy D,Haynes C,von Lieres E

更新日期：2014-08-01 00:00:00

abstract：:In the last few years, an increasing number of biotechnological techniques have been applied to the restoration and conservation of works of art, paintings, old maps, and papers or books. Enzymes can solve problems that give restorers difficulties, although for many applications it is not possible to use soluble enzym...

journal_title：Biotechnology and bioengineering

authors： Moeschel K,Nouaimi M,Steinbrenner C,Bisswanger H

更新日期：2003-04-20 00:00:00

abstract：:The feasibility of continuous ester synthesis in a membrane bioreactor (MBR) by a recombinant cutinase from Fusarium solani pisi was investigated, using the optimal conditions previously attained by medium engineering. The objective was to analyze the MBR behavior as a differential or an integral reactor. The main com...

journal_title：Biotechnology and bioengineering

authors： Carvalho CM,Aires-Barros MR,Cabral JM

更新日期：2001-01-20 00:00:00

abstract：:The efficiency of a versatile in vivo cascade involving a promiscuous alcohol dehydrogenase, obtained from a biodiversity search, and a Baeyer-Villiger monooxygenase was enhanced by the independent control of the production level of each enzyme to produce ε-caprolactone and 3,4-dihydrocoumarin. This goal was achieved ...

journal_title：Biotechnology and bioengineering

authors： Ménil S,Petit JL,Courvoisier-Dezord E,Debard A,Pellouin V,Reignier T,Sergent M,Deyris V,Duquesne K,de Berardinis V,Alphand V

更新日期：2019-11-01 00:00:00

abstract：:The unicellular green alga Haematococcus pluvialis has been exploited as a cell factory to produce the high-value antioxidant astaxanthin for over two decades, due to its superior ability to synthesize astaxanthin under adverse culture conditions. However, slow vegetative growth under favorable culture conditions and ...

journal_title：Biotechnology and bioengineering

authors： Zhang Z,Wang B,Hu Q,Sommerfeld M,Li Y,Han D

更新日期：2016-10-01 00:00:00

abstract：:The glycosylation of pharmaglycoproteins from recombinant cell lines can be affected by an uncontrolled accumulation of ammonium in the medium. Glucosamine-6-phosphate isomerase (GPI) has been proposed as the key enzyme responsible for elevating the intracellular UDP-N-acetylhexosamine pool (UDPGNAc) by accepting ammo...

journal_title：Biotechnology and bioengineering

authors： Cayli A,Hirschmann F,Wirth M,Hauser H,Wagner R

更新日期：1999-10-20 00:00:00

abstract：:A structured kinetic model describing growth, differentiation, and penicillin production in submerged Penicillium chrysogenum fermentations is reported. The filamentous hyphae are divided into four distinct regions on the basis of the activities and structure of hyphal compartments, viz., actively growing (mainly apic...

journal_title：Biotechnology and bioengineering

authors： Paul GC,Thomas CR

更新日期：1996-09-05 00:00:00

abstract：:Several researchers have demonstrated that the presence of a heterologous protein in recombinant Escherichia coli elicits a response similar to the heat-shock response, which includes enhanced protease expression. The present work detects, quantifies, and characterizes intracellular protease activity in E. coli that a...

journal_title：Biotechnology and bioengineering

authors： Harcum SW,Bentley WE

更新日期：1993-09-05 00:00:00

abstract：:Uranium contamination is a serious concern at several sites motivating the development of novel treatment strategies such as the Geobacter-mediated reductive immobilization of uranium. However, this bioremediation strategy has not yet been optimized for the sustained uranium removal. While several reactive-transport m...

journal_title：Biotechnology and bioengineering

authors： Zhao J,Scheibe TD,Mahadevan R

更新日期：2011-07-01 00:00:00

abstract：:Diffusion of phenol through a biofilm attached to activated carbon particles was investigated. The biofilm was grown on activated carbon particles in a draft-tube three-phase fluidized-bed bioreactor operating in a fed-batch mode. It was found that phenol did not adsorb on the biofilm and that the diffusion coefficien...

journal_title：Biotechnology and bioengineering

authors： Fan LS,Leyva-Ramos R,Wisecarver KD,Zehner BJ

更新日期：1990-02-05 00:00:00

abstract：:The downstream processing of virus particles for vaccination or gene therapy is becoming a critical bottleneck as upstream titers keep improving. Moreover, the growing pressure to develop cost-efficient processes has brought forward new downstream trains. This review aims at analyzing the state-of-the-art in viral dow...

journal_title：Biotechnology and bioengineering

authors： Nestola P,Peixoto C,Silva RR,Alves PM,Mota JP,Carrondo MJ

更新日期：2015-05-01 00:00:00

abstract：:Membrane morphology is compared to protein depostion under passive adsorption and ultrafiltration conditions. Solute resistance of protein deposits for membranes of varying roughness, structure, and permeability can vary dramatically with operating conditions. Using Brunauer-Emmett-Teller adsorption isotherm (BET), st...

journal_title：Biotechnology and bioengineering

authors： Chen V,Kim KJ,Fane AG

更新日期：1995-07-20 00:00:00

abstract：:Gluconobacter melanogenus IFO 3293 cells capable of converting L-sorbose to L-sorbosone were immobilized in polyacrylamide gel. The preferred polymer composition for high activity and stability was determined to contain a total monomer concentration of 7.2% and 16.6% crosslinking agent. No significant differences in o...

journal_title：Biotechnology and bioengineering

authors： Martin CK,Perlman D

更新日期：1976-02-01 00:00:00

abstract：:Cell culture longevity in fed-batch culture of hybridomas is often limited by elevated medium osmolality caused by repeated nutrient feeding. Shotwise feeding of 10x Dulbecco's modified Eagle's medium (DMEM) concentrates elevated the osmolality of medium up to 540 mOsm/kg at the end of fed-batch culture of S3H5/gamma2...

journal_title：Biotechnology and bioengineering

authors： Ryu JS,Lee GM

更新日期：1999-01-05 00:00:00

abstract：:During lignocellulosic ethanol fermentation, yeasts are exposed to various lignocellulose-derived inhibitors, which disrupt the efficiency of hexose and pentose co-fermentation. To understand the metabolic response of fermentation microbes to these inhibitors, a comparative metabolomic investigation was performed on a...

journal_title：Biotechnology and bioengineering

authors： Wang X,Jin M,Balan V,Jones AD,Li X,Li BZ,Dale BE,Yuan YJ

更新日期：2014-01-01 00:00:00

abstract：:Protein localization in Saccharomyces cerevisiae was studied with two plasmid systems used as a model: one containing the SUC2 structural gene fused with the MFalpha1 (alpha-factor) promoter and signal-sequence, the other containing the entire SUC2 gene. Special emphasis was placed on the effect of promoter/signal-seq...

journal_title：Biotechnology and bioengineering

authors： Marten MR,Seo JH

更新日期：1989-11-01 00:00:00

abstract：:Cellulase (Cellulosin AC-8) was immobilized on poly-L-glutamic acid. This immobilized cellulase (IC) is water soluble in the neutral and alkaline solutions, where IC has the activity, while IC can be made insoluble by lowering the pH so that it can be recovered from the reaction mixture with its activity. The optimum ...

journal_title：Biotechnology and bioengineering

authors： Takeuchi T,Makino K

更新日期：1987-02-01 00:00:00

abstract：:The effector functions elicited by IgG antibodies strongly depend on the carbohydrate moiety linked to the Fc region of the protein. Therefore several approaches have been developed to rationally manipulate these glycans and improve the biological functions of the antibody. Overexpression of recombinant beta1,4-N-acet...

journal_title：Biotechnology and bioengineering

authors： Ferrara C,Brünker P,Suter T,Moser S,Püntener U,Umaña P

更新日期：2006-04-05 00:00:00

abstract：:An 11-L helical ribbon impeller (HRI) bioreactor was tested for the culture of Spodoptera frugiperda (Sf-9) cells. This impeller and surface baffling ensured homogeneous mixing and high oxygen transfer through surface aeration and surface-induced babble generation. Serum-supplemented and serum-free cultures, using TNM...

journal_title：Biotechnology and bioengineering

authors： Kamen AA,Tom RL,Caron AW,Chavarie C,Massie B,Archambault J

更新日期：1991-09-01 00:00:00

abstract：:Propionic acid (PA) and its salts are widely used in the food, pharmaceutical, and chemical industries. Microbial production of PA by propionibacteria is a typical product-inhibited process, and acid resistance is crucial in the improvement of PA titers and productivity. We previously identified two key acid resistanc...

journal_title：Biotechnology and bioengineering

authors： Guan N,Li J,Shin HD,Du G,Chen J,Liu L

更新日期：2016-06-01 00:00:00

abstract：:The key objective for recombinant protein production in bacteria is the maximum exploitation of the cell factory's potential, whereby often strong expression vectors are used to increase product yield. If the metabolic load caused by recombinant expression exceeds the host's capacity, the system exhausts itself, resul...

journal_title：Biotechnology and bioengineering

authors： Grabherr R,Nilsson E,Striedner G,Bayer K

更新日期：2002-01-20 00:00:00

abstract：:In our previous study [Hong Y, Brown DG (2009) Appl Environ Microbiol 75(8):2346-2353], the adenosine triphosphate (ATP) level of adhered bacteria was observed to be 2-5 times higher than that of planktonic bacteria. Consequently, the proton motive force (Delta p) of adhered bacteria was approximately 15% greater than...

journal_title：Biotechnology and bioengineering

authors： Hong Y,Brown DG

更新日期：2010-04-01 00:00:00

abstract：:Aggregates of Escherichia coli confined within hollowfiber reactors were either formed in place by culturing cells within the reactors, or were prepared by injecting a cell suspension that had been concentrated by centrifugation. The effective diffusive permeability of an uncharged nonreacting tracer, nitrous oxide, w...

journal_title：Biotechnology and bioengineering

authors： Libicki SB,Salmon PM,Robertson CR

更新日期：1988-06-20 00:00:00

abstract：:Non-invasive methods for online monitoring of biotechnological processes without compromising the integrity of the reactor system are very important to generate continuous data. Even though calorimetry has been used in conventional biochemical analysis for decades, it has not yet been specifically applied for online d...

journal_title：Biotechnology and bioengineering

authors： Regestein L,Maskow T,Tack A,Knabben I,Wunderlich M,Lerchner J,Büchs J

更新日期：2013-05-01 00:00:00

abstract：:The DeltaSf of one unit carbon formula weight of Escherichia coli K-12 cells, when grown on succinic acid, was calculated to be -80.13 J/deg. This value could then be used to calculate the entropy change accompanying the anabolism and metabolism of succinic acid to be 30.82 J/deg and 32.40 J/mol deg, respectively. The...

journal_title：Biotechnology and bioengineering

authors： Battley EH

更新日期：1993-02-20 00:00:00

abstract：:Adenoviruses are human pathogens increasingly used as gene therapy and vaccination vectors. However, their impact on cell metabolism is poorly characterized. We performed carbon labeling experiments with [1,2-13 C]glucose or [U-13 C]glutamine to evaluate metabolic alterations in the amniocyte-derived, E1-transformed 1...

journal_title：Biotechnology and bioengineering

authors： Carinhas N,Koshkin A,Pais DA,Alves PM,Teixeira AP

更新日期：2017-01-01 00:00:00

abstract：:Cytochrome c-oxidase, used as a model membrane-bound enzyme, was embedded in phospholipid bilayer membranes, attached to nanometer-sized Fe(3)O(4) colloids (so-called magnetoliposomes). In comparison with the lipid-depleted free enzyme, both the activity and the enzymatic stability of the complexes, stored at 4 degree...

journal_title：Biotechnology and bioengineering

authors： De Cuyper M,De Meulenaer B,Van der Meeren P,Vanderdeelen J

更新日期：1996-03-20 00:00:00

abstract：:A respiratory-deficient, mutant of Kluyveromyces fragilis was isolated using a ethidium bromide mutagenesis. It was characterized by a loss of cytochromes a + a3 and by an improvement of its inulinase activity. Under anaerobic conditions this mutant was always better than the wild strain for ethanol production especia...

journal_title：Biotechnology and bioengineering

authors： Guiraud JP,Bourgi J,Stervinou M,Claisse M,Galzy P

更新日期：1987-05-01 00:00:00