Flocculent Yeast
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Evaluation of stress tolerance and fermentative behavior of indigenous Saccharomyces cerevisiae
Sixty six indigenous Saccharomyces cerevisiae strains were evaluated in stressful conditions (temperature, osmolarity, sulphite and ethanol tolerance) and also ability to flocculate. Eighteen strains showed tolerant characteristics to these stressful conditions, growing at 42 ºC, in 0.04% sulphite, 1 mol L-1 NaCl and 12% ethanol. No flocculent characteristi
Braz. J. Microbiol.. Publicado em: 15/11/2013
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2. Scanning electron microscopy of the interaction between Cryptococcus magnus and Colletotrichum gloeosporioides on papaya fruit
The objective of this work was to investigate possible modes of action of the yeast Cryptococcus magnus in controlling anthracnose (Colletotrichum gloeosporioides) on post harvested papaya fruits. Scanning electron microscopy was used to analyze the effect of the yeast on inoculations done after harvest. Results showed that C. magnus is able to colonize woun
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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3. Fermentação alcoólica com leveduras de características floculantes em reator tipo torre com escoamento ascendente
O etanol tem sido considerado como um combustível alternativo para diminuir problemas ambientais e energéticos no mundo, em razão da escassez e alta dos preços dos combustíveis fósseis, e da poluição causada por estes. O setor sucroalcooleiro brasileiro acredita que será um dos maiores fornecedores mundiais de álcool combustível e de tecnologias p
Publicado em: 2010
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4. Study of continuous fermentation process for ethanol production using self-immobilized cells in fixed bed tower reactors / Estudo do processo fermentativo continuo para produção de etanol utilizando celulas auto-imobilizadas em reatores tipo torres
using flocculation yeasts of Saccharomyces cerevisiae in fixed bed tower reactors for ethanol production. We sought, through this job, the selection between four flocculent yeasts strains with appropriate metabolic profile to work in this kind of reactor. The selected yeasts strains present strong flocculent characteristics and there is no need to use cell s
Publicado em: 2007
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5. Use of tower reactors for continuous ethanol production
The purpose of this work was to develop a continuous fermentation system operating with a tower reactor using some flocculent yeast strains isolated from an industrial process. The strain was an used in the trial of the proposed system, composed of two serial glass tower reactor. The effects of the following variables were studied on the yield and productivi
Brazilian Journal of Chemical Engineering. Publicado em: 2002-04
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6. Purification and partial characterization of a flocculin from brewer's yeast.
Analysis of a shear supernatant from flocculent, "fimbriated" Saccharomyces cerevisiae brewer's yeast cells revealed the presence of a protein involved in flocculation of the yeast cells and therefore designated a flocculin. The molecular mass of the flocculin was estimated to be over 300 kDa, as judged from sodium dodecyl sulfate-polyacrylamide gel electrop
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7. Action of Deflocculating Agents on Saccharomyces cerevisiae Class III Brewer's Yeast
Earlier work with a fluorescent aid indicated that flocculent brewer's yeast may have more surface lipids than nonflocculent types. Organic solvents were checked against flocculent Gilliland yeasts. It was found that those reagents which affect “free” lipids had no dispersive action, and those which remove “bound” fats had a powerful dispersive actio
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8. Improvement of a Wine Saccharomyces cerevisiae Strain by a Breeding Program
Hybridization by spore conjugation was used to develop new and improved wine yeasts of Saccharomyces cerevisiae. The procedure was achieved with diploid, homothallic strains with high sporulation frequency and high spore viability. The method was verified by crossing flocculent and non-H2S-forming strains. Single-spore descendants of the hybrids were studied
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9. Genes Affecting the Expression of Cytochrome c in Yeast: Genetic Mapping and Genetic Interactions
The four mutant genes, cyc2, cyc3, cyc8 and cyc9, that affect the levels of the two iso-cytochromes c in the yeast Saccharomyces cerevisiae have been characterized and mapped. Both cyc2 and cyc3 lower the amount of iso-1-cytochrome c and iso-2-cytochrome c; whereas, cyc8 and cyc9 increase the amount of iso-2-cytochrome c. The cyc2, cyc3, cyc8 and cyc9 genes
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10. Region of Flo1 Proteins Responsible for Sugar Recognition
Yeast flocculation is a phenomenon which is believed to result from an interaction between a lectin-like protein and a mannose chain located on the yeast cell surface. The FLO1 gene, which encodes a cell wall protein, is considered to play an important role in yeast flocculation, which is inhibited by mannose but not by glucose (mannose-specific flocculation
American Society for Microbiology.
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11. Aquaporins in Saccharomyces: Characterization of a second functional water channel protein
The Saccharomyces cerevisiae genome database contains two ORFs with homology to aquaporins, AQY1 and AQY2. Aqy1p has been shown to be a functional aquaporin in some strains, such as Σ1278b. AQY2 is disrupted by a stop codon in most strains; however, Σ1278b has an intact ORF. Because Σ1278b Aqy2p has an intracellular localization in Xenopus oocytes a
The National Academy of Sciences.
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12. Identification of Two Saccharomyces cerevisiae Cell Wall Mannan Chemotypes
We have obtained evidence for two structurally and antigenically different Saccharomyces cerevisiae cell wall mannans. One, which occurs widely and is found in S. cerevisiae strain 238C, is already known to be a neutral mannan which yields mannose, mannobiose, mannotriose, and mannotetraose on acetolysis of the (1 → 6)-linked backbone. The other, which was