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Defects of the mitochondrial respiratory chain : biochemical studies and mathematical modellingLowerson, Shelagh Anne January 1999 (has links)
No description available.
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Regulation of glycogen synthase kinase 3 in cultured human muscleRochford, Justin J. January 1998 (has links)
No description available.
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Intracellular signalling pathways activated by Fc#gamma#RIRomero, Alirio Jose Melendez January 1998 (has links)
No description available.
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Regulation of platelet activation by the Src and Tec families of cytoplasmic tyrosine kinasesQuek, Lynn S. January 1999 (has links)
No description available.
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An investigation of chloroplast ATPase structure and function using anti-peptide antibodiesTurton, Janet Susan January 1995 (has links)
No description available.
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Reversible phosphorylation of proteins in proliferating and differentiating cells : cyclic variations and the effect of growth regulators / Gracinda Maria Nunes Ferreira.Ferreira, Gracinda Maria Nunes January 1994 (has links)
A Dissertation Submitted to the Faculty of SCience
University of the Witwatersrand, Johannesburg
In fulfilment of the requirements
for the Degree of Doctor of Philosophy / Living cells are highly auto-dynamic entities which
means that the underlying biochemistry is equally
dynamic, a reality which is ignored by most researchers.
Theoretical studies indicate that such a state must be
due to the existence of oscillatory variations in the
levels and activities of key components in the cell. In
this study, the dynamic behaviour of four major,
interrelated areas of cell biochemistry
(phosphorylation, dephosphorylation, the terminal
reaction of glycolysis and the amount of soluble
protein) were examined and all systems found to
oscillate in murine erythroleukaemic cells (MEL) and,
where examined, also in the human HL-60 leukaemic cell
line. (Abbreviation abstract) / AC 2018
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Reversible phosphorylation of proteins in proliferating and differentiating cells : cyclic variations and the effect of growth regulatorsFerreira, Gracinda Maria Nunes January 1994 (has links)
A Dissertation Submitted to the Faculty of Science
University of the Witwatersrand, Johannesburg
In fulfilment of the requirements
for the Degree of Doctor of Philosophy / Living cells are highly auto-dynamic entities which
means that the underlying biochemistry is equally
dynamic, a reality which is ignored by most researchers.
Theoretical studies indicate that such a state must be
due to the existence of oscillatory variations in the
levels and activities of key components in the cell. In
this study, the dynamic behaviour of four major,
interrelated areas of cell biochemistry
(phosphorylation, dephosphorylation, the terminal
reaction of glycolysis and the amount of soluble
protein) were examined and all systems found to
oscillate in murine erythroleukaemic cells (MEL) and,
where examined, also in the human HL-6Q leukaemic cell
line.
certain processes have been shown to be oscillatory for the first time ( phosphorylation
potential, the lactate dehydrogenase active isozyme level and aspects of the regulation thereof). While others have been shown to occur at a higher frequency
than previously reported (phosphotyrosine phosphatase
activity, the activity and apparent isozyme pattern of
lactate dehydrogenase, the amount of extractable
protein). All rhythms are shown (for the first time) to
be complex and to involve several contributing
periodicities, some modulating the period and amplitude
of the observed oscillation. The frequencies are very
high (periods of 1-20 minutes and probably Less) and the
amplitudes are equally high (variations in magnitude of
as much as a hundred fold).
Phosphorylation processes, currently of particular
interest with regard to the nature and control of cell
proliferation are thus found to be more highly dynamic
than previously believed, a fact which throws some doubt
on the current ideas on cell proliferation. The actual
lactate dehydrogenase (LDH) active isozyme pattern is
shown not to be constant (as generally believed) but to
vary at high frequency (possibly due to
phosphorylation of the the enzyme) while the kinetics
and specificity of the lone isozyme in murine
erythroleukaemic cells appear to be varying at
equally high frequency due to the action of
regulators (perhaps arising elsewhere within the
glycolytic pathway). Similar results were obtained with
HL-60 leukaemic cells with at least two of the
isozymes varying in level, to some extent independently.
The hormone, insulin, and the inducer of cell
differentiation, HMBA (hexamethylenebisacetamide), have
been found to affect the dynamics of the four systems
although, because of the complexity of the rhythms the
actual effects on the dynamics are not easily defined.
Insulin has a marked effect on the mean level of
the activity of the LDH isozyme.
The fact that all oscillations are seen despite no
attempt being made to synchronise the cell population
suggests the existence of communication between cells
but how this can occur when the rhythms are of such high
frequency is intriguing.
All the results add further support for the long
standing view of my supervisor, that the properties and
behaviour of cells reflect the internal dynamics and
that differentiation, cancer and intracellular
signalling occur through changes in the pattern of
temporal organisation of cellular oscillations. / AC2018
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Reversible phosphorylation of proteins in proliferating and differentiating cells: cyclic variations and the effect of growth regulatorsFerreira, Gracinda Maria Nunes January 1994 (has links)
A Dissertation Submitted to the Faculty of Science
University of the Witwatersrand, Johannesburg
In fulfilment of the requirements
for the Degree of Doctor of Philosophy
Johannesburg 1994 / Living cells are highly auto-dynamic entities which means that the
underlying biochemistry is equally dynamic, a reality which is ignored
by most researchers.
Theoretical studies indicate that such a state must be due to the
existence of oscillatory variations in the levels and activities of key components in the cell. In this study, the dynamic behaviour of four
major, interrelated areas of cell biochemistry (phosphorylation,
dephosphorylation, the terminal reaction of glycolysis and the amount
of soluble protein) were examined and all systems found to oscillate
in murine erythroleukaemic cells (MEL) and, where examined, also
in the human HL-6Q leukaemic cell line. [Abbreviated Abstract. Open document to view full version] / MT2017
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Human Ependymin-1 Neurotrophic Factor Mimetics Reduce Tau Phosphorylation and Cellular Apoptosis in Vitro and in Vivo in Alzheimer’s Disease ModelsRonayne, Rachel E. 03 September 2008 (has links)
"Alzheimer’s disease (AD) is the most widespread neurodegenerative disorder, affecting approximately 20 million people worldwide. AD pathology is primarily characterized by the formation of extracellular amyloid plaques resulting from the aggregation of insoluble amyloid-beta 1-42 (A-beta), and neurofibrillary tangles (NFT’s) resulting from intracellular aggregation of hyperphosphorylated tau protein. The current FDA-approved AD treatments do not stop or reverse neurodegeneration, but only treat the symptoms by increasing acetylcholine neurotransmitter. Our laboratory is attempting to provide an additional therapeutic approach by using neurotrophic factors to block apoptosis or to restore neurons. We previously demonstrated that, in an in vitro model for AD, hEPN-1 neurotrophic factor mimetics can block synthetic A-beta-induced neuronal cell death when added to cultures, presumably by blocking caspase activation. In this thesis, we extended these findings to study the effect of A-beta and hEPN-1 on tau hyperphosphorylation (as measured by immunoblots with phospho-specific antibodies) and nuclear DNA fragmentation (as measured by TUNEL staining), both in vitro and in vivo in AD transgenic mice. We found that A-beta induces the hyperphosphorylation of tau in both mouse N2a and human SHSY neuronal cells, and that hEPN-1 may lower this phosphorylation in N2a cells. Furthermore, we discovered that hEPN-1 can reduce nuclear DNA fragmentation when added both simultaneously to A-beta and 3 and 6 hours post A-beta addition. Finally, in vivo hEPN-1 may lower both tau hyperphosphorylation and caspase-7 related protein (C7RP) in AD transgenic (Tg) mice. The overall results validate our in vitro AD model, show the efficacy of hEPN-1 at blocking A-beta-induced DNA fragmentation even when added post-insult, and show that hEPN-1 may work in an AD mouse model. However, more studies must be conducted to confirm these findings. "
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Purification and characterization of a mammalian DNA kinasePrinos, Panagiotis January 1994 (has links)
No description available.
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