Batch Culture
Mostrando 37-48 de 481 artigos, teses e dissertações.
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37. Continuous ethanol production using immobilized yeast cells entrapped in loofa-reinforced alginate carriers
A culture of Saccharomyces cerevisiae M30 entrapped in loofa-reinforced alginate was used for continuous ethanol fermentation in a packed-bed reactor with initial sugar concentrations of 200-248 g/L. Maximum ethanol productivity of 11.5 g/(L·h) was obtained at an ethanol concentration of 57.4 g/L, an initial sugar concentration of 220 g/L and a dilution rat
Brazilian Journal of Microbiology. Publicado em: 2011-06
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38. Production of functional killer protein in batch cultures upon a shift from aerobic to anaerobic conditions
The aim of this work was to study the production of functional protein in yeast culture. The cells of Saccharomyces cerevisiae Embrapa 1B (K+R+) killed a strain of Saccharomyces cerevisiae Embrapa 26B (K-R-)in grape must and YEPD media. The lethal effect of toxin-containing supernatant and the effect of aeration upon functional killer production and the corr
Brazilian Archives of Biology and Technology. Publicado em: 2011-06
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39. Overview of parameters influencing biomass and bioreactor performance used for extracellular ligninase production from Phanerochaete chrysosporium
The production of extracellular enzymes is gaining momentum as commercial interests seek alternative ways to improve the productivity in the biotechnology and pharmaceutical industries. Early research studies looked at improving batch bioreactor operational challenges; however, the use of continuous cultures was indicated to be favourable. This led to a new
Brazilian Archives of Biology and Technology. Publicado em: 2010-10
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40. Nanobacteria-like particles : a threat to cell cultures
The main goal of this study is to alert researchers who work with cell cultures for the risk of contamination by structures called nanobacteria (NB). NB are tiny structures with size varying from 80 to 500 nm, commonly occurring in clusters and producing a biofilm which contains carbonate or hydroxyl apatite. The most likely source of cell culture contaminat
Publicado em: 2010
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41. Produção de cefamicina C por Streptomyces clavuligerus em batelada e batelada alimentada
Cephamycin C (CephC) is a natural antibiotic produced by Streptomyces clavuligerus that presents β-lactamases resistance, enzymes that clives β-lactam of antibiotics. The aim of present work was study cephamycin production by Streptomyces clavuligerus in batch and fed-batch cultivations, in order to define important parameters as culture medium and
Publicado em: 2010
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42. Study of environment conditions of Arthrospira (Spirulina) platensis culture in tubular photobioreactor using fed-batch process with urea as nitrogen source / Estudo das condições ambientais no cultivo de Arthrospira (Spirulina) platensis em fotobiorreator tubular por processo descontínuo alimentado com uréia como fonte de nitrogênio
The cyanobacterium Arthrospira (Spirulina) platensis, ones of the most studied and cultivated photosynthetic microorganisms in the planet, has a unique biomass composition that includes: high protein content, polyunsaturated fat acids, natural pigments and other substances of interest in food, pharmaceutical and cosmetic industries. Recent studies demonstrat
Publicado em: 2010
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43. Production and extraction of clavulanic acid from Streptomyces spp. by extractive fermentation using aqueous two-phase system / Produção e extração de ácido clavulânico de Streptomyces spp. por fermentação extrativa utilizando sistemas de duas fases aquosas
Clavulanic acid (CA) is a potent inhibitor of β-lactamases used in the medical field. Alternative methods, economic and simple purification are of great interest. This PhD project aims to produce and extract clavulanic acid of Streptomyces spp. By extractive fermentation using aqueous two-phase system (ATPS) - Polyethylene glycol (PEG)/phosphate salts.
Publicado em: 2010
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44. Effect of branched-chain amino acids, valine, isoleucine and leucine on the biosythesis of bitespiramycin 4"-O-acylspiramycins
Bitespiramycin, a group of 4"-O-acylated spiramycins with 4"-O-isovalerylspiramycins as the major components, was produced by recombinantspiramycin-producing strain Streptomyces spiramyceticus harboring a 4"-O-acyltransferase gene. The experiment was initially performed in synthetic medium with 0.5 g l-1 Valine, Isoleucine or Leucine feeding at 36 h cultivat
Brazilian Journal of Microbiology. Publicado em: 2009-12
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45. Experimental purification of paclitaxel from a complex mixture of taxanes using a simulated moving bed
A laboratory-scale simulated moving bed (SMB) was designed and tested for the separation of paclitaxel, a powerful anti-cancer agent known as Taxol@, from impurities of a plant tissue culture (PTC) broth. The innovative strategy of a pseudo-binary model, where mixtures A and B were treated as single solutes A and B, was used in the linear standing wave analy
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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46. Interação entre Cylindrospermopsis raciborskii e Microcystis aeruginosa: implicações no crescimento de culturas e na produção de microcistinas / Interaction between Cylindrospermopsis raciborskii and Microcystis aeruginosa: implications in cultures growth and microcystins production
Cyanobacteria play important ecological role in many terrestrial and aquatic ecosystems. However, they become a public health problem when synthesize secondary toxic compounds, known as cyanotoxins, which may act on several organisms. Impacted aquatic systems favor their growth and these microorganisms can become dominant due to mechanisms that confer them a
Publicado em: 2009
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47. Obtenção e caracterização filogenética de consórcio de bactérias púrpuras não-sulforosas consumidoras de ácidos orgânicos visando a produção de hidrogênio em reator anaeróbio de batelada / Obtaintion and phylogenetic characterization of consortium of phototrophic purple non-sulfur bacteria for hydrogen production from organic acids in the anaerobic batch reactor
The aim of this work was enrich a mixture of granular sludge of an up flow anaerobic sludge blanket (UASB) under anoxygenic phototrophic conditions. The techniques of molecular biology identified 17 operational taxonomic units (UTO) in the microbial consortium among the sequences analised, which were similar to Rhodobacter, genus widely cited in studies of h
Publicado em: 2009
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48. Produção de celulases e xilanases por Penicillium echinulatum em processo submerso utilizando biorreatores com agitação mecânica e airlift de circulação interna
Cellulolytic enzymes have many uses, particularly in the food, textile, and paper industries. However, their major potential use is in the hydrolysis of cellulose a component of lignocellulosic residues for ethanol fuel production. Among the cellulase-producing microorganisms, mutants of the Trichoderma genus are the most studied and most widely used in the
Publicado em: 2009