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Evaluation of evolutionary engineering strategies for the generation of novel wine yeast strains with improved metabolic characteristics /Horsch, Heidi K. January 2008 (has links)
Thesis (PhD)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.
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Malate and tartrate in Oregon grapesNorton, Kerry M. 01 May 1987 (has links)
In western Oregon the titratable acidity of grapes at
harvest may in some seasons be higher than desirable for
making quality wine, due to the retention of malic acid.
The purposes of this study were 1) to investigate the
effects of a vineyard cultural practice, cluster exposure
at veraison by basal leaf removal, as a means of reducing
the malate content and titratable acidity of grapes, and 2)
to develop a rapid, simple, and inexpensive test procedure
by which smaller wineries and vineyards could evaluate the
effects of their own field experiments on the malate and
tartrate content of their grapes.
1. At veraison, clusters of Chardonnay grapes were a)
exposed to the sun by removal of all leaves opposite or
below the clusters, b) treated as in a) but shaded with
shadecloth, c) exposed to the sun by tying back leaves
opposite or below the clusters, or d) left untreated as a
control. Clusters of White Riesling were exposed to the
sun by similar leaf removal a) 10 days before veraison, b)
10 days after veraison, or c) untreated. Clusters of Pinot Noir were exposed a) at veraison, b) 2 weeks after
veraison, or c) untreated. Exposed clusters received 3 to
3.5 times more light than shaded clusters and up to 32%
more heat, with temperature differences between exposed and
shaded treatments being most pronounced during cool, sunny
weather. None of the treatments had any effect on juice or
berry malate, tartrate, or potassium content; however,
exposed clusters of Pinot Noir had a lower pH (.03) and
higher titratable acidity (.06%) than the control at
harvest. Cluster exposure of Chardonnay increased
sunburning of grapes, and cluster exposure of Pinot Noir at
veraison caused a 1% reduction in juice soluble solids
concentration at harvest. The detrimental effects of
cluster exposure by basal leaf removal at veraison, as well
as the lack of any major effect on the acid content of the
berries, suggest that the practice has no value for acid
reduction during a warm, dry maturation season in western
Oregon.
2. A rapid, simple procedure for the estimation of the
malate and tartrate content of grape juice is described.
The procedure, which requires only a pH meter for
instrumentation, does not directly measure malate and
tartrate but instead measures their buffering effect.
Samples are titrated between pH 2.70-3.00 and pH 4.50-4.80
and the titrant volumes required are compared to two sets
of empirically derived standard curves. The malate and tartrate composition of the sample may be determined by a graphical or algebraic method. The use of the estimation
method, its advantages, and its limitations are illustrated
with different viticultural trials. The estimation error
(estimated value - measured value) was influenced by many
factors including maturity, season, vineyard location, and
cultivar. Standard deviations of the estimation error for
malate and tartrate in mature grapes were equal to 9% and
15%, respectively, of the mean malate and tartrate
concentrations in pooled Pinot Noir and Chardonnay samples
from different vineyards and years. The estimation error
is probably due to interference from other buffers present
in juice. Although not as accurate as existing analytical
methods, the estimation method appears potentially useful
for determining relative effects of treatments in vineyard
trials where analytical equipment is unavailable or for
monitoring malate decline during maturation of grapes. / Graduation date: 1987
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Extraction of wine components with liquid carbon dioxide /Magashi, Anne. Unknown Date (has links)
Thesis (M App Sc) -- University of South Australia, 1992
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Growth and metabolism of `Leuconostoc oenos` and `Lactobacillus plantarum` in wine / by Thomas Henick-KlingHenick-Kling, Thomas January 1986 (has links)
Bibliography: leaves 172-187 / xxiv, 187 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, 1986
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Production and localisation of haze protective material from Saccharomyces cerevisiae /Dupin, Isabelle Valérie Simone. January 1997 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Horticulture, Viticulture and Oenology, 1998. / Includes bibliographical references (p. 177-188).
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Identification and characterisation of Vitis vinifera pathogenesis-related proteins that accumulate during berry ripening /Tattersall, David Bruce. January 1999 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Horticulture, Viticulture and Oenology, 1999. / Includes bibliographical references (leaves 138-158).
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Perceptions of wine qualityCharters, Steve. January 2004 (has links)
Thesis (Ph.D.)--Edith Cowan University, 2004. / Submitted to the Faculty of Business and Public Management. Includes bibliographical references.
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Optimising the antioxidant content of red wine /Clare, Steven Scott. January 2004 (has links)
Thesis (PhD.)-- University of Western Sydney, 2004. / "A thesis submitted to the University of Western Sydney for the degree of Doctor of Philosophy, Faculty of Food, Science and Horticulture, University of Western Sydney, Hawkesbury, Richmond, NSW, Australia. December, 2004." Includes bibliographical references and appendices.
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Evaluation of single-bounce attenuated total reflectance/Fourier transform infrared and two-dimensional correlation spectroscopy in quantitative analysisCocciardi, Robert Arthur. January 1900 (has links)
Thesis (Ph.D.). / Written for the Dept. of Food Science and Agricultural Chemistry, Macdonald College of McGill University. Title from title page of PDF (viewed 2008/08/04). Includes bibliographical references.
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Le commerce des vins et des eaux-de-vie en Languedoc sous l'ancien régimeGeraud Parracha, Guillaume. January 1900 (has links)
Thesis--Montpellier, 1957. / Date from spine. Includes bibliographical references (p. [357]-360). Also issued in print.
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