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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Genetic and biochemical analysis of disulfide bond isomerization in Escherichia coli /

Qiu, Ji, January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references (leaves 102-117). Available also in a digital version from Dissertation Abstracts.
12

Structure, function, and engineering of disulfide bond isomerization in Escherichia coli

Segatori, Laura 28 August 2008 (has links)
Not available / text
13

Genetic and biochemical studies of disulfide bond isomerization in Escherichia coli

Zhan, Xiaoming 23 June 2011 (has links)
Not available / text
14

A study of the kinetics of isomerization of diphenylhexatriene

Para, John Michael, 1932- January 1960 (has links)
No description available.
15

The catalytic isomerization of alpha-pinene and the catalytic oxidation of the isomerized products

Smoyer, Howard Walter 05 1900 (has links)
No description available.
16

Ferrocenes of Substituted Indenyl Ligands

Fern, Glen Matthew January 2005 (has links)
This thesis describes the preparation and characterization of a variety of methyl-, trimethylsilyl-, and diphenylphosphino-substituted indenes. The indenes were then used in the preparation of bis(indenyl)iron(II) complexes. The bis(indenyl)iron(II) complexes were characterized by ¹H, ¹³C, and ³¹P-NMR, UV/visible spectroscopy, cyclic voltammetry, and mass spectrometry. The cyclic voltammetry shows an approximately linear relationship between the oxidation potential and the type of substituent and its ring position, but with increasing substitution leads to lower than expected oxidation potentials. The UV/visible spectra show two absorption bands in the visible region. The position of the bands are essentially unaffected by methyl-substitution, but the low energy band red-shifts with trimethylsilyl- and diphenylphosphino-substitution. Di(2-methylindenyl)iron(II), bis(4,7-dimethyl-indenyl)iron(II), bis(1,3-bis(trimethylsilyl)indenyl)iron(II), rac-bis(1-diphenyl-phosphinoindenyl)iron(II), rac-bis(1-diphenylphosphino-3-methylindenyl)iron(II), and rac-bis(1-diphenylphosphino-2,3-dimethylindenyl)iron(II) were characterized by X-ray crystallography.The planar chiral ferrocenylphosphine bis(1-diphenylphosphinoindenyl)iron(II) is observed to undergo a facile ring-flipping isomerization from the meso isomer to the racemic isomer in THF at ambient temperature. The isomerization is slowed by the addition of the noncoordinating solvent chloroform, but is accelerated by the addition of LiCl. Rate and activation parameters for the isomerization have been determined to be: kobs = 1.6 x 10⁻⁵ s⁻¹ at 23 ℃, ΔH‡ = 58 ± 4 kJ mol⁻¹, ΔS‡ = −140 ± 15 J mol⁻¹ K⁻¹. Deuterium labeling of bis(1-diphenylphosphinoindenyl)iron(II) in the 3- and 3ʹ-position ruled out the isomerization proceeding by [1,5]-proton shifts or dissociative mechanisms. The proposed mechanism for the isomerization proceeds via coordination of two THF ligands with ring-slippage of one of the indenyl ligands until it is coordinated through the phosphine. Coordination of the indenyl ligand by the other face leads to the formation of the other isomer.The heterobimetallic complexes (bis(1-diphenylphosphinoindenyl)iron(II))-cis-dichloropalladium(II), (bis(1-diphenylphosphinoindenyl)iron(II))-cis-dichloro-platinum(II), and [(cyclooctadiene)(rac-bis(1-diphenylphosphinoindenyl)iron(II))-rhodium(I)] tetraphenylborate were prepared. Attempts to prepare dichloro(bis(1-diphenylphosphinoindenyl)iron(II))nickel(II) lead to the formation of trans-dichloro(bis(1-diphenylphosphinoindene))nickel(II). The complex (bis(1-diphenyl-phosphinoindenyl)iron(II))-cis-dichloropalladium(II) is able to catalyze the cross-coupling of bromobenzene with n-/sec-butylmagnesium chloride. However. the reaction is not selective with isomerization of the alkyl group and reduction of the halide occurring via a β-hydride elimination mechanism.
17

Studies of psi synthase RluA with a potent inhibitor RNA containing 5-fluorouridine /

Vizthum, Caroline A. January 2008 (has links)
Thesis (M.S.)--University of Delaware, 2007. / Principal faculty advisor: Eugene G. Mueller, Dept. of Chemistry & Biochemistry. Includes bibliographical references.
18

Studies of the isomerization of retinoids in the vertebrate retina /

McBee, Joshua K. January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 180-203).
19

Isomerization, reactivity, and structural study of a thioperoxide-bridged dimolybdenum(V) dimer

Tuong, Chi Minh, January 2004 (has links) (PDF)
Thesis (M.S.)--University of Louisville, 2004. / Department of Chemistry. Vita. "May 2004." Includes bibliographical references (leaves 55-59).
20

Molecular probes for the evaluation of three isomerase enzyme mechanisms in secondary metabolism /

Nasomjai, Pitak. January 2010 (has links)
Thesis (Ph.D.) - University of St Andrews, January 2010.

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