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.
Results
Showing 1 to 14 of 14 for “"yeast assimilable nitrogen"”.
-
Effects of Hydroxycinnamates and Exogenous Yeast Assimilable Nitrogen on Cider Aroma and Fermentation Performance
… of high concentrations of phenolic compounds on yeast fermentation. The objective of this study was to determine the impact of ferulic acid, p-coumaric acid, and chlorogenic acid—at concentrations reported in apples—and their interactions with yeast assimilable nitrogen (YAN) on fermentation …
-
The Effect of Fungicide Residues and Yeast Assimilable Nitrogen on Fermentation Kinetics and H2S Production during Cider Fermentation
… hydrogen sulfide (H2S) in cider fermentations. Yeast assimilable nitrogen (YAN) concentration and composition and residual fungicides influence H2S production by yeast during fermentation, but these factors have to date only been studied in wine grape fermentations. This study surveyed 12 …
-
Modest Differences in Juice Yeast Assimilable Nitrogen Concentration and Composition Influence Wine Chemistry and Impart Limited Sensory Differences in Virginia-grown Chardonel
Nitrogen is requisite for yeast growth and metabolism during wine fermentation, and contributes to wine flavor development. Understanding how yeast assimilable nitrogen (YAN) impacts wine chemistry and sensory properties helps inform nitrogen management decisions in both the vineyard and winery. …
-
Impact of Juice Clarification Processes on Chemical Composition of Hard Cider
… in cider is the sulfur off-aromas production by yeast during fermentation. Fermentation of cloudy juice is often associated with sulfur off-aromas in white wine production; therefore, pre-fermentation juice clarification is an important and routine step in white winemaking practice. However, …
-
Assessment of Vineyard Nitrogen Management upon Grape Chemistry
… to vines and grape musts which are deficient in nitrogen (N). A must that is deficient in yeast assimilable nitrogen (YAN) can lead to the production of off aromas and stuck or sluggish fermentations. It has also been suggested that musts with limited amino nitrogen sources can result in wines …
-
Effect of Foliar Nitrogen and Sulfur Applications on Aroma Profile of Vitis vinifera L. cv. Petit Manseng using Modified Quantitative Descriptive Analysis, SPME GC-MS and Electronic Nose Technology
… in 2011 and 2012 were fertilized with soil nitrogen at 0, and 30 kgN/ha, foliar nitrogen at 15kg/ha and foliar nitrogen plus sulfur at 15kg/ha and 5kg respectively. Point quadrat analysis demonstrated foliar nitrogen alone and nitrogen plus sulfur treatments increased percent gaps and lower …
-
Evaluation of Nitrogen Management Schemes upon Vine Performance in Cover Cropped Vineyards
… in Eastern vineyards, many vineyards experience nitrogen (N) deficiencies in both the vegetative vine tissue and yeast assimilable nitrogen (YAN) in the juice. Soil applications of calcium nitrate and foliar applications of urea were assessed as a means of vineyard N amelioration at cover cropped …
-
Impact of Yeast Nutrient Supplementation Strategies on Hydrogen Sulfide Production during Cider Fermentation
… (H2S), is a negative off aroma produced during yeast fermentation and is common in cider and leads to consumer rejection. H2S has a very low odor detection threshold (ODT) and is often described as "rotten egg". H2S is produced when juice is deficient in yeast nutrients, such as amino acids and …
-
Management Strategies for Natural Cider Fermentation: Effects of sulfite addition and acidification in high- and low- tannin cultivars
… volatile acidity, malic acid, free/total SO2, yeast assimilable nitrogen (YAN), total polyphenols, residual sugars, and ethanol. For the acidified condition, the pH was lowered to 3.2 using malic acid. Cider pH ranged from 3.36 ± 0.04 to 3.72 ± 0.07, reflecting a general trend toward rising pH …
-
Optimizing nitrogen fertilization practices under intensive vineyard cover cropping floor management systems
… resulted in increased competition for soil nitrogen, leading to decreased vine nitrogen status and berry yeast assimilable nitrogen (YAN). The aim of this study was to determine the effects of different nitrogen fertilization methods applied at varying doses and different times, on vine and …
-
Evaluation of Nitrogen Management Schemes in Cover Cropped Vineyards
… in Eastern vineyards, many vineyards experience nitrogen (N) deficiencies in both the vegetative vine tissue and yeast assimilable nitrogen (YAN) in the juice. Soil applications of calcium nitrate and foliar applications of urea were assessed as a means of vineyard N amelioration at cover cropped …
-
Aplicación foliar en el viñedo de un extracto del alga Ascophyllum nodosum como herramienta para mejorar la composición nitrogenada, fenólica y aromática de la uva y del vino de las variedades Tempranillo y Tempranillo Blanco
… (Vitis vinifera L.) grapevines on the phenolic, nitrogen and volatile composition of grapes and wines in 2017 and 2018 seasons, as well as to characterize the phenolic, nitrogen and volatile composition of grapes and wines of Tempranillo Blanco grapevine variety. The applications of these …
-
Influencia del uso de cubiertas vegetales sobre la fertilidad del suelo, la expresión vegetativa de la vid y la composición de la uva y del vino en un viñedo de Tempranillo (Vitis vinifera L.) de la D.O.C. Rioja
… Regarding soil nutrients availability, the nitrogen fixation capacity of the leguminous crop marked a difference and, in fact, the soil nitrogen availability, in its nitrate form, which is the one that the vine assimilates primarily, was higher in the clover crop treatment from the second …
-
Root restriction, under-trellis cover cropping, and rootstock modify vine size and berry composition of Cabernet Sauvignon
Vineyards in the Mid-Atlantic often have large, vigorous vines that can be costly to manage and produce inadequate fruit for wine production. Dense canopies increase the incidence of fungal disease, require greater allocation of resources to manage, and inhibit fruit development. The primary …