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Flocculence and pseudohyphal growth in wine yeasts
Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613942460710912 |
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| access_status_str | Open Access |
| author | Carstens, Elsa |
| author2 | Pretorius, I. S. |
| author_browse | Carstens, Elsa Pretorius, I. S. |
| author_facet | Pretorius, I. S. Carstens, Elsa |
| author_sort | Carstens, Elsa |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55889 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:09.875Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/55889 Flocculence and pseudohyphal growth in wine yeasts Carstens, Elsa Pretorius, I. S. Lambrechts, M. G. Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture & Oenology & Institute for Wine Biotechnology. Fermentation Wine and wine making -- Microbiology Flocculation Saccharomyces cerevisiae Dissertations -- Microbiology Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998. The yeast Saccharomyces cerevisiae exhibits different phenotypes in response to nutrient-deficient conditions. A prominent phenomenon under such conditions is the formation of cell aggregates, including pseudohyphal growth, flocculation and velum formation. Although clear explanations do not yet exist for these specific phenotypes, it is generally accepted that these could be mechanisms associated with the protection of the yeast cells against unfavorable conditions. Flocculation is of great importance during the production of beer and wine, especially sparkling wine, because spontaneous, fast sedimentation at the end of alcoholic fermentation is required. Commercial strains of S. cerevissiae that are widely used for winemaking are selected for specific wine production conditions. All these strains possess the ability to conduct the different fermentations optimally, resulting in high-quality wines. Velum-forming yeasts are commonly used during the production of flor sherries, where the cells grow as a layer of scum on the surface of the wine. The flocculation characteristic also adds to the quality of natural wines because it facilitates the removal of the clear fermented product. The necessity of centrifuge, filtration or long waiting periods for spontaneous settling and removal of the lees from the natural wine eradicated. Less movement and handling of the wine lead to the conservation of wine quality. During sparkling wine production, the remuage process is decreased to only a few hours. Masters 2012-08-27T11:37:17Z 2012-08-27T11:37:17Z 1998 Thesis http://hdl.handle.net/10019.1/55889 en_ZA Stellenbosch University 107 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Fermentation Wine and wine making -- Microbiology Flocculation Saccharomyces cerevisiae Dissertations -- Microbiology Carstens, Elsa Flocculence and pseudohyphal growth in wine yeasts |
| title | Flocculence and pseudohyphal growth in wine yeasts |
| title_full | Flocculence and pseudohyphal growth in wine yeasts |
| title_fullStr | Flocculence and pseudohyphal growth in wine yeasts |
| title_full_unstemmed | Flocculence and pseudohyphal growth in wine yeasts |
| title_short | Flocculence and pseudohyphal growth in wine yeasts |
| title_sort | flocculence and pseudohyphal growth in wine yeasts |
| topic | Fermentation Wine and wine making -- Microbiology Flocculation Saccharomyces cerevisiae Dissertations -- Microbiology |
| url | http://hdl.handle.net/10019.1/55889 |
| work_keys_str_mv | AT carstenselsa flocculenceandpseudohyphalgrowthinwineyeasts |