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Pattern Formation and Growth Kinetics in Eutectic Systems

Description: Growth patterns during liquid/solid phase transformation are governed by simultaneous effects of heat and mass transfer mechanisms, creation of new interfaces, jump of the crystallization units from liquid to solid and their rearrangement in the solid matrix. To examine how the above processes influence the scale of microstructure, two eutectic systems are chosen for the study: a polymeric system polyethylene glycol-p-dibromobenzene (PEG-DBBZ) and a simple molecular system succinonitrile (SCN)-… more
Date: December 1, 2007
Creator: Teng, Jing
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Interface stability and defect formation during crystal growth

Description: Unidirectional solidification experiments have been carried out in organic crystals with the aim of improving our knowledge on the effects of constraints on the interface morphology and to increase our understanding of the growth of anisotropic materials. The experimental information shows that lateral constraints such as a sharp change in the cross-sectional area in the solid liquid interface path, can produce important changes in the microstructure if the interface morphology is planar, cellu… more
Date: January 8, 1991
Creator: Fabietti, L.M.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Molecular Science Research Center annual report

Description: The Chemical Structure and Dynamics group is studying chemical kinetics and reactions dynamics of terrestrial and atmospheric processes as well as the chemistry of complex waste forms and waste storage media. Staff are using new laser systems and surface-mapping techniques in combination with molecular clusters that mimic adsorbate/surface interactions. The Macromolecular Structure and Dynamics group is determining biomolecular structure/function relationships for processes the control the biol… more
Date: January 1, 1991
Creator: Knotek, M.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[Regulation of terpene metabolism]

Description: During the last grant period, we have completed studies on the key pathways of monoterpene biosynthesis and catabolism in sage and peppermint, and have, by several lines of evidence, deciphered the rate-limiting step of each pathway. We have at least partially purified and characterized the relevant enzymes of each pathway. We have made a strong case, based on analytical, in vivo, and in vitro studies, that terpene accumulation depends upon the balance between biosynthesis and catabolism, and p… more
Date: January 1, 1991
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Two dimensional NMR of liquids and oriented molecules

Description: Chapter 1 discusses the quantum mechanical formalism used for describing the interaction between magnetic dipoles that dictates the appearance of a spectrum. The NMR characteristics of liquids and liquid crystals are stressed. Chapter 2 reviews the theory of multiple quantum and two dimensional NMR. Properties of typical spectra and phase cycling procedures are discussed. Chapter 3 describes a specific application of heteronuclear double quantum coherence to the removal of inhomogeneous broaden… more
Date: February 1, 1987
Creator: Gochin, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[Regulation of terpene metabolism]. Annual progress report, March 15, 1991--March 14, 1992

Description: This report describes accomplishments over the past year on understanding of terpene synthesis in mint plants and sage. Specifically reported are the fractionation of 4-S-limonene synthetase, the enzyme responsible for the first committed step to monoterpene synthesis, along with isolation of the corresponding RNA and DNA cloning of its gene; the localization of the enzyme within the oil glands, regulation of transcription and translation of the synthetase, the pathway to camphor biosynthesis,a… more
Date: December 31, 1992
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[Regulation of terpene metabolism]. Progress report, [March 15, 1993--March 14, 1994]

Description: Many lines of evidence suggest that the cyclases ((+){minus}bornyl pyrophosphate cyclases and ({minus}){minus}limonene cyclases) catalyze the rate-limiting steps of monoterpene biosynthesis in sage and mint, respectively. Similar evidence indicates that camphor hydroxylase, and the reductases that control the disposition of methone, are the critical steps of monoterpene catabolism in these systems. Related studies, based on in vitro assay of enzyme activities, have suggested that the accumulati… more
Date: March 1, 1994
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Regulation of terpene metabolism]. Annual progress report, March 15, 1989--March 14, 1990

Description: Terpenoid oils, resins, and waxes from plants are important renewable resources. The objective of this project is to understand the regulation of terpenoid metabolism using the monoterpenes (C{sub 10}) as a model. The pathways of monoterpene biosynthesis and catabolism have been established, and the relevant enzymes characterized. Developmental studies relating enzyme levels to terpene accumulation within the oil gland sites of synthesis, and work with bioregulators, indicate that monoterpene p… more
Date: November 9, 1989
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Regulation of terpene metabolism]. Annual progress report, March 15, 1990--March 14, 1991

Description: During the last grant period, we have completed studies on the key pathways of monoterpene biosynthesis and catabolism in sage and peppermint, and have, by several lines of evidence, deciphered the rate-limiting step of each pathway. We have at least partially purified and characterized the relevant enzymes of each pathway. We have made a strong case, based on analytical, in vivo, and in vitro studies, that terpene accumulation depends upon the balance between biosynthesis and catabolism, and p… more
Date: December 31, 1991
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Regulation of terpene metabolism]

Description: Terpenoid oils, resins, and waxes from plants are important renewable resources. The objective of this project is to understand the regulation of terpenoid metabolism using the monoterpenes (C[sub 10]) as a model. The pathways of monoterpene biosynthesis and catabolism have been established, and the relevant enzymes characterized. Developmental studies relating enzyme levels to terpene accumulation within the oil gland sites of synthesis, and work with bioregulators, indicate that monoterpene p… more
Date: November 9, 1989
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Regulation of terpene metabolism]

Description: This report describes accomplishments over the past year on understanding of terpene synthesis in mint plants and sage. Specifically reported are the fractionation of 4-S-limonene synthetase, the enzyme responsible for the first committed step to monoterpene synthesis, along with isolation of the corresponding RNA and DNA cloning of its gene; the localization of the enzyme within the oil glands, regulation of transcription and translation of the synthetase, the pathway to camphor biosynthesis,a… more
Date: January 1, 1992
Creator: Croteau, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

RECENT ADVANCES IN THE POWDER METALLURGY OF URANIUM CARBIDE

Description: uranium carbide, uranium metal is converted to uranium hydride powder and then carburized using propane gas. The carbide particles are irregular, of a relatively uniform size, and highly pyrophoric. Paraffin, camphor, cetyl alcohol, beeswax, and carbowax are used as lubricants and binders for compacting uranium carbide powder. Sintering studies were conducted for various times and temperatures, primarily in vacuum. An investigation is in progress to evaluate the effect of carbon content on the … more
Date: October 31, 1962
Creator: Kalish, Herbert S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Molecular recognition in gas sensing: Results from acoustic wave and in-situ FTIR measurements

Description: Surface acoustic wave (SAW) measurements were combined with direct, in-situ molecular spectroscopy to understand the interactions of surface-confined sensing films with gas-phase analytes. This was accomplished by collecting Fourier-transform infrared external-reflectance spectra (FTIR-ERS) on operating SAW devices during dosing of their specifically coated surfaces with key analytes.
Date: June 1, 1998
Creator: Hierlemann, A.; Ricco, A.J.; Bodenhoefer, K. & Goepel, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Composition of the essential oils from Rocky Mountain juniper (Juniperus scopulorum), Big sagebrush (Artemisia tridentata), and White Sage (Salvia apiana).

Description: The essential oils of Juniperus scopulorum, Artemisia tridentata, and Salvia apiana obtained by steam extraction were analyzed by GC-MS and GC-FID. For J. scopulorum, twenty-five compounds were identified which accounts for 92.43% of the oil. The primary constituents were sabinene (49.91%), {alpha}-terpinene (9.95%), and 4-terpineol (6.79%). For A. tridentata, twenty compounds were identified which accounts for 84.32% of the oil. The primary constituents were camphor (28.63%), camphene (16.88%)… more
Date: September 1, 2003
Creator: Hochrein, James Michael; Irwin, Adriane Nadine & Borek, Theodore Thaddeus, III
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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