Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"Wine quality"”.
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Impact of foliar molybdenum application in acutely deficient vineyard on wine quality
… commercial production after grapevine health and wine quality problems were reported and diagnosed as molybdenum deficiency (in the absence of other nutrient issues). Among grape juice parameters: pH, Brix and titratable acidity, in 2017 samples, Brix was higher in molybdenum-treated vines …
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Determining cross-cultural wine quality drivers: a chemical, sensorial and data fusion approach
Described as a complex beverage, wine is enjoyed by many, with associated quality rather difficult to define. Novice wine consumers are guided by experts in terms of wine quality identified and associated with certain wines, however many consumers lack wine knowledge and find it difficult to …
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The impact of grape clone, yeast strain and protein on sparkling wine quality
The foaming properties in sparkling wine are an indicator of quality as it is the first quality perception consumers have upon opening a bottle of sparkling wine. Proteins, which are derived from both grapes and yeast during sparkling wine production, are known to impact the foaming properties in …
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Relationships between berry sensory assessment and wine quality in Vitis vinifera L. Shiraz
… is a technique that can help grapegrowers and winemakers make decisions about harvest date and grape product allocation. BSA as a structured technique has been used by grapegrowers, winemakers and researchers for the last thirteen years. However the number of studies reporting results of the …
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Ultraviolet Radiation as a Regulator of Grapevine Leaf Physiology and Berry and Wine Quality
Se han desarrollado muchos estudios acerca de los efectos de la radiación ultravioleta (UV) sobre la vid, pero esta Tesis Doctoral presenta, por primera vez, una perspectiva global e integradora sobre dichos efectos, incluyendo enfoques básicos y aplicados desde la planta hasta el vino en …
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Caracteres responsables de la calidad y estructura de los vinos tintos ultrapremium
… report has focused on studying the intrinsic quality of Spanish ultra-premium red wines. First, the sensory attributes (aroma, taste, and mouthfeel) that are relevant to predicting the intrinsic quality of the object's wines have been analyzed. Although advances have been made regarding the …
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Electronic Nose Evaluation of Grape Maturity
… is a critical attribute impacting potential wine quality. Maturity evaluation is difficult due to the many interrelated factors that impact physicochemical changes and limitations in the understanding of these factors. Current methods of assessing grape maturity are destructive, expensive, …
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The enzymatic release of glycosidically-bound terpenes in must
Flavour in wines is perhaps the most important factor affecting wine quality, with monoterpenoids being among the compounds contributing to flavour. In grapes there exists glycosidically-bound forms of these monoterpenes, representing a latent source of aroma. This project is a study on the ability …
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The effect of weather on critic ratings and auction prices for Stellenbosch Bordeaux blends from 2001-2021.
… season conditions are crucial in determining the quality of grapes in a vineyard. Identifying the climate variables with the greatest effect is therefore of interest to viticulturists and winemakers. Continued warming is evident for Stellenbosch since 2001, especially the last ten years. This …
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Feasibility study using remote sensing technologies to improve zonal vineyard management
… and fruit composition, which further impacts wine quality. The remote sensing data analysis tools included normalized difference vegetation index (NDVI), and other indices extracted from electromagnetic reflectance data of grapevine leaves and canopies. In each site, sentinel vines (i.e., …
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The impact of wine closure and packaging type, and light and temperature exposure on the concentration of 3-alkyl-2 -methoxypyrazines and other key constituents of wine
… for vegetative percepts that are detrimental to wine quality when elevated. This study tested both the effect of closure/packaging types and light/temperature storage conditions on MPs (isopropyl-, secbutyl-, and isobutyl-MP) in wine. An MP-emiched wine rapidly (after 140 hours) and significantly …
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Vineyard soil matters: exploring the influence of soil physical and chemical properties on Eastern U.S. grape production
The relationship between soil and wine quality has been recognized for generations but has had limited scientific validation. Vineyard soils in the eastern United States are largely unstudied although proper site selection and good soil management have the potential to improve fruit composition for …
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Effects of Capture and Return on Chardonnay (Vitis vinifera L.) Fermentation Volatiles
… volatiles, as a means of improving white wine quality, was evaluated. Twenty-three aroma-active volatiles including ethyl esters, acetate esters, fusel alcohols, and fatty acids, were quantified using head-space solid phase microextraction with GC/MS. Volatile analysis of fermentations …
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Study of different soil management techniques to improve the cultivation of the vine and encourage its sustainability
… their impact on soil, vine development, and the quality of grapes and wine, with the goal of promoting more sustainable viticultural practices without compromising the quality of the final product. This study is based on a four-year agronomic trial in which three organic mulch treatments and two …
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Good Grapes - Good Wine.
<p>Good grapes are required to make good wine. Quality wines start in quality vineyards. Vineyard design, installation, and operation, including site location, trellis options, vine selection, and canopy management, along with when to harvest are discussed. While winemaking is the final phase in …
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The supply and demand of wine-on-tap in the United States: An examination of perceptions and experiences
… trend in the United States' foodservice and wine industry: wine-on-tap. Three study populations were investigated: wine consumers, restaurant and winery professionals. Contrary to expectations driven by literature and the diffusion of other wine product innovations, American wine consumers …
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Characterisation of glycosidase enzymes of wine lactic acid bacteria
Many compounds important for wine quality are in the glycosidic form, that is a sugar moiety is attached, through a glycosidic linkage, to the alcoholic group of the compound. Such glycosidic compounds comprise several groups, all having great relevance to wine quality and can be broadly grouped as …
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La influencia de la tecnología de la vinificación en la microbiología y el desarrollo de la fermentación alcohólica
The enological practices used on white wine elaboration introduce some advantages and disadvantages. In order to avoid negative effects some applicable resources have been developed to assure a correct fermentation. The present Thesis studies the effects of these applicable resources on the natural …
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An Electrolytic Method for Tartrate Stabilization in Chardonnay Wine
… (CaT) which is an undesirable outcome for wine quality. There are a variety of current tartrate stabilization techniques such as cold stabilization, chemical additives, ion exchange resins, and electrodialysis that stabilize wine, but the most popular being cold stabilization. Cold …
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Documentation of grapevine leafroll-associated viruses in wine grape varieties and native grape species in Virginia, and examination of the movement of grapevine leafroll disease to develop management strategies
… can cause significant crop loss and affect wine quality by reducing sugar accumulation and compromising skin color. Mealybugs are vectors of grapevine leafroll-associated viruses (GLRaVs). A statewide survey of commercial and wild grapevines in Virginia was conducted during 2009 through …
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