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169 - 174 of
174
The Correlation Between Carbon-Proton and Proton-Proton Coupling Constants
The correlation between the carbon-proton and proton-proton coupling constants have been studied in various 13 systems. Isocrotonic acid-carboxyl-3C, crotonic acid- 13 13 carboxyl-3C, and 5-norbornene-2-carboxylic acid-carboxyl-3C- 1,5,6,7,7-hexachloro were synthesized and their carbonproton coupling constants were analyzed. Nmr studies showed the magnitudes of the carbon-proton coupling constants to correlate well with analogous protonproton coupling constants, although the values of the couplings were larger than expected. The geminal olefinic couplings were considerably larger than all other couplings, but they were self-consistent. The signs of the carbon-proton coupling constants also were in agreement without exception with the signs of analogous proton-proton coupling constants.
Date:
December 1975
Creator:
Seiwell, Ruth R.
System:
The UNT Digital Library
Denaturation, Renaturation and Other Structural Studies on Phosphoglucose Isomerases
Structural properties of phosphoglucose isomerases isolated from a variety of species have been compared by peptide fingerprinting, predicted amino acid sequence homologies and by denaturation and renaturation studies. The enzymes are more readily denatured in guanidinium chloride than in urea, and the isomerase isolated from yeast is more stable toward acid pH than the rabbit muscle enzyme. The rates of guanidinium chloride-induced denaturation are markedly increased by ionic strength and decreased by substrates, competitive inhibitors or glycerol. The enzyme can be renatured, but only in the presence of glycerol. The renaturation process is dependent on protein concentration and temperature and provides a method for the formation of mixed species heterodimers.
Date:
December 1975
Creator:
Young, Clint D.
System:
The UNT Digital Library
Isolation and Characterization of Proteus vulgaris Methylglyoxal Synthetase
Methylglyoxal synthetase, which catalyzes the formation of methylglyoxal and inorganic phosphate from dihydroxyacetone phosphate, was found in extracts of Proteus vulgaris. An efficient purification procedure utilizing ion exchange column chromatography and isoelectric focusing has been developed. Homogeneity of the enzyme preparation was confirmed by polyacrylamide gel electrophoresis and rechromatography.Two components of methylglyoxal synthetase were obtained upon isoelectric focusing. A comparison of the chemical and physical properties of the two components was carried out. The enzyme is a dimer. In the presence of inorganic phosphate, the hyperbolic saturation kinetics with dihydroxyacetone phosphate are shifted to sigmoidal.
Date:
May 1975
Creator:
Tsai, Pei-Kuo
System:
The UNT Digital Library
Four Chamber Arias of Vincenzo Bellini
This paper explores the musical significance, history, and development of Vincenzo Bellini's four chamber arias. Nancy W. Barfield discusses the life of composer Vincenzo Bellini, his musical style, and the style of the arias themselves.
Date:
May 1975
Creator:
Barfield, Nancy W.
System:
The UNT Digital Library
The Elements of Early New Orleans Jazz
This paper discusses the development of jazz that occurred in the Storyville district of New Orleans. Bernard Norman Rose explores the history of the area and the influences that resulted in a synthesis of music.
Date:
May 1975
Creator:
Rose, Bernard Norman
System:
The UNT Digital Library
The "Dante" Sonata: The Diabolical Liszt
This paper describes the creation and impact of Franz Liszt's "Dante" Sonata. Bill Blaine gives historical context and elaborates on the literary and philosophical influences evident in the piece before providing an examination of the music.
Date:
May 1975
Creator:
Blaine, Bill
System:
The UNT Digital Library