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 67 for “"terpenes"”.
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The enzymatic release of glycosidically-bound terpenes in must
… exists glycosidically-bound forms of these monoterpenes, representing a latent source of aroma. This project is a study on the ability of different enzymes to release these monoterpenes in Muscat d'Alexandrie and Weisser Riesling grapes. Different commercial enzyme preparations were …
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The role of terpenes as protectors of the potato crop
… legislation changes have reduced its usage. Monoterpenes may provide an alternative natural solution to sprouting inhibition. S-Carvone has been shown to suppress sprouting in potato varieties, and importantly, has no effect on processing quality of potatoes. Cyclodextrins have been studied as a …
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Biosynthesis of Terpenes: Carbon-14 Incorporation in Mentha Piperita and Pelargonium Graveolens
Made available in DSpace on 2014-12-05T19:37:50Z (GMT). No. of bitstreams: 1 6200567.pdf: 4439551 bytes, checksum: f20af11b38423fc8e6f6890b66da25a7 (MD5) Previous issue date: 1961
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Investigations of Bicyclo(3.1.1)heptane Terpenes in Higher Plants: Stereochemistry of Pinene Biosynthesis and Isolation of Bergamoten-12-Oic Acids
… geranyl pyrophosphate (GPP) to the bicyclic monoterpenes (+)-$\alpha$-pinene (cyclase I) and ($-$)-$\alpha$-pinene and ($-$)-$\beta$-pinene (cyclase II). The stereochemical course of these cyclizations at the gem dimethyl position of the pinene products was investigated. (6E)- (8-$\sp3$H) GPP was …
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Implementation of genetic and untargeted metabolomics to study the role of the terpene synthase vir4 from Trichoderma virens in plant-microbe interactions : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… compounds (VOCs), mostly comprising volatile terpenes. Terpenes are abundantly produced natural products with several biological properties. However, little is known about the role of T. virens volatile terpenes as signalling mediators of the inter-colony communication and modulators of the …
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Investigation of the Stereochemistry of the Methyl-to-Methylene Elimination in the Biosynthesis of Several Terpenes Through the Use of Chiral Methyl Labeled Compounds
The synthesis of (R)- (13-$\sp2$H, $\sp3$H) farnesyl diphosphate has been completed by methodology similar to that used for the synthesis of (R)- (9-$\sp2$H, $\sp3$H) geranyl diphosphate. Incubation of the radiolabeled farnesyl diphosphate with 5-epi-aristolochene synthase gave the ($\sp2$H, …
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The terpenes of Virginia pine (<u>Pinus virginiana mill</u>.), with investigations of their attractancy to the southern pine beetle (<u>Dendroctonus frontalis</u> zimm.)
… qualitatively and quantitatively analyze the monoterpenes of Virginia pine. The instrument was adjusted for optimum performance prior to sample analysis. Two packed columns with stationary phases of different polarity, Carbowax 20M and polyphenyl ether + Igepal + Versamid-9JO, were used …
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Antimicrobial Activity of Cannabis Extraction Products and Terpenes against Foodborne Pathogens And Use of Electrochemically Activated (ECA) Water for Control of Indoor Mold in a Cannabis Production Facility
Cannabis has been in the news a lot lately and food industries are coming up with innovative ideas every day to use cannabis in their products. To name a few new food and beverage products which have incorporated cannabis for flavor or medicinal purposes are beers, chocolates, cookies, and other …
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Part I: Circular dichroism studies of optically active charge transfer complexes. Part II: vapor phase and solvent dependence circular dichroism studies of some terpenes, α-phenylethanol, and α-phenylethylamine
… Vitamin K<sub>3</sub> with chiral donors such as terpenes, steroids and β-phenylethylamine derivatives in methylene chloride at 27° were investigated. A new transition not attributable to either component alone, but due to a CT complex was observed. The donors investigated were: (-)-fenchone, …
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Effect of canopy manipulation and fermentation on grape aroma components
… into the canopy fruiting zone. Free volatile terpenes (FVT) were increased by ethephon in two of three seasons while shoot topping increased FVT and potentially free volatile terpenes (PVT) in one of three seasons. In the second separate three-year study, two to four leaves were removed from …
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Identification, Characterization, and Functional Analysis of Terpenoid Specialized Metabolism in Switchgrass (Panicum virgatum) and Carrot (Daucus carota)
… I investigated the metabolism and function of terpenes, the largest class of specialized metabolites, in switchgrass and carrot. Switchgrass (Panicum virgatum L.), a perennial C4 grass of the Tallgrass Prairie, represents an important species in natural and anthropogenic grasslands of North …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… compounds implicated in plant defence, notably terpenes. In Chapter 1, I explored the genetic structure in Eucalyptus globulus to understand how processes such as gene flow and genetic drift have shaped the genetic distribution of the species. Using microsatellite-derived genotypes of …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… compounds implicated in plant defence, notably terpenes. In Chapter 1, I explored the genetic structure in Eucalyptus globulus to understand how processes such as gene flow and genetic drift have shaped the genetic distribution of the species. Using microsatellite-derived genotypes of …
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Biochemical, Molecular and Functional Analysis of Volatile Terpene Formation in Arabidopsis Roots
… root-specific formation and function of volatile terpenes in the model plant Arabidopsis. As one objective, we have characterized the two root-specific terpene synthases, TPS22 and TPS25. Both enzymes catalyze the formation of several volatile sesquiterpenes with (E)-β-farnesene as the major …
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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
… increased concentrations of alcohols, esters and terpenes compared to the free fraction. With nitrogen fertilization, acid and enzyme hydrolysis had reduced concentrations of some higher alcohols and carboxylic acids. Acid hydrolysis released more terpenes with nitrogen treatments versus enzymatic …
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The Origins of Terpene Infochemicals in Insects: Identification and Evolutionary Analysis of Terpene Synthases in Diverse Lineages
… abundant class of specialized metabolites are terpenes, which are released by many members of taxonomically diverse insect lineages as pheromone and defense compounds. Despite the broad occurrence of terpenes in insects, knowledge of their biosynthesis remains limited compared to that in other …
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Biochemical and Functional Characterization of Induced Terpene Formation in Arabidopsis Roots
… biosynthesis and function of volatile terpenes in the model plant Arabidopsis. When infected with the root rot pathogen Pythium irregulare, Arabidopsis roots release the acyclic C11-homoterpene (E)-4,8-dimethylnona-1,3,7-triene (DMNT), which is a common constituent of volatile blends …
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Key volatile and nonvolatile off-flavor characterization for nine different hemp protein powders
… contained more aldehydes, carboxylic acids, and terpenes.
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Effect of canopy manipulation on rot incidence and rot metabolites of White Riesling (Vitis vinifera L.) grapes
… rot on general fruit chemistry, free volatile terpenes, potentially free volatile terpenes, selected polyols and rot metabolites was undertaken. Grape sour rot increased °Brix, glucose to fructose ratio, titratable acidity, tartaric acid, glycerol and gluconic acid. Grape sour rot reduced the …
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THE BIOSYNTHSIS OF QUERCETIN IN BUCKWHEAT
… account for the synthesis of carbohydrates (1)0 terpenes and isoprenoid compounds (2, 30 4, 5), steroid sapogenins (6), and other classes of compounds. However most of the theories on biogenesis have been based on molecular structure relation-ships or known laboratory reactions and, until …
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