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Dissertations / Theses on the topic 'Purine and thiamine metabolism'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Black, Duncan Arthur. "Aspects of purine and pyrimidine metabolism." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/26590.

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In Chapter 1 a review of the literature concerning aspects of erythrocyte membrane transport and metabolism, and purine and pyrimidine metabolism is presented. The effects of pH, pO₂ and inorganic phosphate (Pi) on the uptake and metabolism of hypoxanthine by erythrocytes has been studied in Chapter 2. Uptake of hypoxanthine and accumulation of inosine 5'-monophosphate (IMP) were markedly increased at acid pH, high external phosphate concentrations, and low pO₂. Release of accumulated IMP as hypoxanthine occurred at alkaline pH values and low external phosphate concentrations. Conditions favou

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2

Alexiou, Maria. "Purine metabolism in the mouse preimplantation embryo." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317658.

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3

Byrne, Kerry. "Genetic analysis of thiamine metabolism in Saccharomyces cerevisiae." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30304.

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A genetic analysis of thiamine metabolism has been carried out in the budding yeast, Saccharomyces cerevisiae. A collection of thiamine auxotrophic mutants were isolated following UV and Ty insertion mutagenesis. The mutations responsible for the auxotrophic phenotypes were characterised to different extents through complementation analysis, molecular cloning and enzyme assays. In total 171 mutants were analysed and all of these have been assigned to complementation groups, genes and/or functions. Some newly isolated mutations were found to be allelic with the known biosynthetic genes, THI4 an

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4

Zhang, Fang. "Dysfunctional thiamine metabolism in experimental diabetes and pharmokinetic modelling." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/55352/.

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A dietary-independent thiamine deficiency has been found in experimental and clinical diabetes. Decreased tissue availability of thiamine due to its increased renal clearance is associated with the development of diabetic nephropathy and possibly other microvascular complications of diabetes. Increased thiamine clearance in diabetes is caused by impaired renal reuptake of thiamine. It is proposed that tissue-specific thiamine deficiency may occur in diabetes at sites of complications development – kidney retina and peripheral nerve. The aim of this project was to investigate the involvement of

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5

Sharma, Ravi Janak. "Uptake and metabolism of circulating inosine and adenosine in the rat." Thesis, St George's, University of London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295171.

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6

Navarro, Darren. "Region-selective effects of thiamine deficiency on cerebral metabolism in pyrithiamine-treated rats." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115904.

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Pyrithiamine-induced thiamine deficiency in rats is a well-established animal model of Wernicke's Encephalopathy (WE). This thesis project, submitted as four articles, presents an examination of metabolic events that contribute to the selective neuronal lesions observed in the medial thalamus (MT) of thiamine-deficient (TD) rat. In addition, the phenomenon of glucose-precipitated worsening of neurological status in WE patients (Wallis et al., 1978; Watson et al., 1981) is explored.<br>Lactate accumulation is known to occur selectively in regions of the TD brain, which ultimately express neuron

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7

Stow, Ruth Anne. "Purine nucleoside transport and metabolism across the rat small intestine." Thesis, University of York, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258382.

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8

Wolfe, Kara. "The Role of Purine Nucleotide Metabolism in Renal Cell Carcinoma Migration." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872926565308.

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9

Rolle, Rosa Sonya. "Isolation and characterization of enzymatic activity mediating cytokinin and purine metabolism in tomato fruit /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487585645577558.

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10

Hassan, H. F. "Purine and pyrimidine metabolism of Leishmania mexicana mexicana and other parasitic protozoa." Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234859.

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11

Björklund, Sam. "Characterization of Inosine triphosphate pyrophosphatase, an important protein involved in purine metabolism." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118076.

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The enzyme inosine triphosphate pyrophosphatase (ITPase) is responsible for controlling the levels of the by-products guanosine monophosphate (GMP) and adenosine monophosphate (AMP) through their precursor inosine monophosphate (IMP). ). Human ITPase consists of a 194-amino acid homodimer which relies upon either an Mg2+ ion or a Mn2+ ion for catalytic activity, and orthologs of this protein have been found in many different organisms. The purpose of this project was to try out methods learned throughout the education and to use this knowledge to gather new data about the human protein inosine

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12

Graham, Gordon W. "A study of biochemical genetic abnormalities associated with purine and pteridine metabolism." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301808.

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13

Mojzita, Dominik. "Thiamine-related regulation of metabolism and gene expression in the yeast Saccharomyces cerevisiae /." Göteborg : Dept. of Cellular and Molecular Biology, Göteborg University, 2007. http://www.loc.gov/catdir/toc/fy0804/2007440827.html.

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14

Fisk, Stuart. "The effect of increased plastid transketolase activity on thiamine metabolism in transgenic tobacco plants." Thesis, University of Essex, 2015. http://repository.essex.ac.uk/15461/.

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Transketolase is a TPP dependent enzyme that affects the availability of intermediates in both the Calvin cycle and non-oxidative pentose phosphate pathway. Previous studies have indicated that changes to the activity level of transketolase can limit growth and development as well as the production of isoprenoids, starch, amino acids and thiamine. The overall aim of this project was to further advance the understanding of the mechanism linking increased TK activity and thiamine metabolism. Nicotiana tabacum mutants with increased total transketolase activity ~ 2 to 2.5 fold higher than WT plan

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15

Kavianipour, Mohammad. "Myocardial energy metabolism in ischemic preconditioning, role of adenosine catabolism." Doctoral thesis, Umeå University, Public Health and Clinical Medicine, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-14.

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<p>Brief episodes of ischemia and reperfusion render the myocardium more resistant to necrosis from a subsequent, otherwise lethal ischemic insult. This phenomenon is called ischemic preconditioning(IP). Today, much is known about the signalling pathways involved in IP; however, the details of the final steps leading to cardioprotection, remain elusive. Adenosine (a catabolite of ATP) plays a major role in the signalling pathways of IP. Following IP there is an unexplained discrepancy between an increased adenosine production (evidenced by increased 5’-nucleotidase activity) and the successive

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16

Gray, Alexander. "Uptake and metabolism of purine nucleotide and pyridoxal phosphate precursors in Trypanosoma brucei brucei." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/18920.

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17

Sinclair, Christopher J. D. "Regulation of extracellular adenosine levels, role of nucleoside transporters, purine metabolism and the blood-brain-barrier." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ62667.pdf.

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18

Amara, Francis Morigua. "The significance of purine salvage pathway enzymes in mutagenesis and nucleotide metabolism in friend erythroleukaemia cells." Thesis, University of Ulster, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281331.

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19

Bolton, Mark C. "Studies on the importance of serine metabolism for purine synthesis de novo in a tumour cell line." Thesis, University of Surrey, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303255.

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20

Marsac, Roxane. "La déficience en Adénylosuccinate Lyase - de la déficience métabolique aux défauts musculaires en utilisant le Caenorhabditis elegans comme modèle animal." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0321.

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La voie de biosynthèse des purines est un réseau métabolique conservé de procaryotes à l'Homme, assurant l'homéostasie de l'ATP et du GTP. Les purines peuvent être synthétisées de novo, réutilisées ou produites par interconversion de métabolites existants à l'aide de la voie dite de recyclage. De plus, les intermédiaires peuvent agir en tant que métabolites signals régulant l'expression génique. Cette voie est bien caractérisée chez des micro-organismes tels la levure ou la bactérie, mais peu de choses sont connues chez les métazoaires. Différentes maladies sont associées à des déficiences enz

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21

Wu, Joe. "HIF-1α in the Heart: Provision of Ischemic Cardioprotection and Remodeling of Nucleotide Metabolism". Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etd/2450.

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In our studies we found that stabilized expression of HIF-1α in heart led to better recovery of function and less tissue death after 30 minutes of global ischemia, via mechanisms that preserve the mitochondrial polarization. Our group previously showed that HIF-1α conferred ischemic tolerance by allowing cardiomyocytes to use fumarate as an alternative terminal electron acceptor to sustain anaerobic mitochondrial polarization. The source of fumarate was identified as the purine nucleotide cycle (PNC). Here we discovered that HIF-1α upregulates AMP deaminase 2 (AMPD2), the entry point to the PN

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22

Орловський, Олександр Вікторович, Александр Викторович Орловский, Oleksandr Viktorovych Orlovskyi, Н. Г. Кучма, К. В. Тімоніна та Т. І. Стороженко. "Особливості показників пуринового обміну у хворих на ревматоїдний артрит". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/55496.

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Ревматоїдний артрит (РА) – аутоімунна хвороба з невідомою етіологією, для якої характерним є симетричний ерозівний артрит та широкий спектр позасуглобових проявів. Розповсюдженість РА серед дорослого населення складає близько 0,5-2% населення. В Україні налічується понад 118 тис. хворих РА. Втрата працездатності і зростання інвалідності є найважливішим соціально-економічним наслідком РА. Серед ланок патогенезу досліджується роль порушень пуринового обміну в патогенезі РА.

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23

Spiegel, Erin Kathleen. "Psychomotor deficits in mice transgenic for a mutant adenylosuccinate lyase associated with autism in humans /." Connect to full text via ProQuest. IP filtered, 2006.

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Thesis (Ph.D. in Human Medical Genetics) -- University of Colorado at Denver and Health Sciences Center, 2006.<br>Typescript. Includes bibliographical references (leaves 127-143). Free to UCDHSC affiliates. Online version available via ProQuest Digital Dissertations;

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24

Boussiengui-Boussiengui, Gino. "Analysis of the role of relative nucleotide concentrations on the regulation of carbohydrate in higher plants." Thesis, Stellenbosch : Stellenbosch University, 2010. http://hdl.handle.net/10019.1/5473.

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Thesis (PhD (Genetics))--Stellenbosch University, 2010.<br>ENGLISH ABSTRACT: The current understanding of the regulation of carbohydrate accumulation is still under investigation despite the tremendous work done in this subject. Purine and pyrimidine nucleotides have been implicated in many biochemical processes in plants. Amongst others, they are building blocks for nucleic acid synthesis, an energy source, precursors for the synthesis of primary products such as sucrose, polysaccharides, phospholipids, as well as secondary products. With the aim of placing adenine and uridine nucleotides in

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25

Legouis, David. "Altération de la néoglucogenèse rénale lors de l’insuffisance rénale aiguë." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS055.

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L’insuffisance rénale aiguë (IRA), quelle qu’en soit sa cause, est fortement associée à la mortalité. Le rein contribue jusqu’à 40 % de la production endogène de glucose à travers la néoglucogenèse, particulièrement pendant les conditions de jeûne de stress. Jusqu’alors, aucune étude ne s’était intéressée au comportement de cette fonction métabolique au cours d’un épisode d’IRA. Cette étude montre que la synthèse de glucose et l’utilisation du lactate sont altérées à la fois chez l’homme, en recourant au cathétérisme artérioveineux rénal chez des patients bénéficiant d’une intervention de chir

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26

Sukop, Paula Herynkopf. "Associação entre a dependência de crack e níveis sanguíneos de tiamina e alumínio." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/143060.

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Introdução: o crack é uma forma extremamente aditiva de cocaína, provocando intensa fissura e um comportamento persistente e intenso de busca pela droga com negligência da alimentação. A alimentação insuficiente pode levar à carência de tiamina. O uso de latas e folhas de alumínio na confecção de cachimbos para o consumo de crack aumenta a exposição de usuários de crack a este metal. Deficiência de tiamina somada a acúmulo cerebral de alumínio pode inibir o metabolismo energético dependente da glicose, levando à neurodegeneração e, possivelmente, à encefalopatia de Wernicke. Objetivos: avaliaç

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27

Rama, Dhirajlal Bhagwan Kasan. "New purine analogues as inhibitors of purine metabolism." Thesis, 2015. http://hdl.handle.net/10539/18104.

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Abstract Phleomycin, a copper containing protein, has a broad range of antibiotics (3,4,6) anti tumor (7,9), and anti-viral (5) activity. At low concentrations it induces DNA breakdown and death in growing culture is of E. coli B, but has little effect on stationary phase bacteria (10) . However, its action can be strongly potentiated on stationary phase cells by the addition of certain compounds. This phenomenon is termed amplification.The mechanism of amplification phleomycin is not well understood. In this study the effects of various purine and pyrimidine analogues reported as amplifie

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28

Stathis, Christos George. "Factors Influencing Muscle Purine Nucleotide Metabolism." 2006. http://eprints.vu.edu.au/581/1/581contents.pdf.

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The experiments in this thesis were designed to investigate the factors influencing the metabolism of purine nucleotides in human skeletal muscle, plasma and urine. Study one investigated the influence of the number of intermittent sprint bouts and the subsequent accumulation of plasma purines and urinary purine excretion. Study two investigated the influence of sprint training on urinary purine loss following intense exercise. Study three examined the influence of allopurinol on urinary purine loss after repeated sprint exercise in humans. The final study examined the combined effects of allo

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29

Stathis, Christos. "Factors Influencing Muscle Purine Nucleotide Metabolism." Thesis, 2006. https://vuir.vu.edu.au/581/.

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The experiments in this thesis were designed to investigate the factors influencing the metabolism of purine nucleotides in human skeletal muscle, plasma and urine. Study one investigated the influence of the number of intermittent sprint bouts and the subsequent accumulation of plasma purines and urinary purine excretion. Study two investigated the influence of sprint training on urinary purine loss following intense exercise. Study three examined the influence of allopurinol on urinary purine loss after repeated sprint exercise in humans. The final study examined the combined effects of allo

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30

Zilles, Julie Lynn. "Characterization of purI mutants Implications for the purine-thiamine branch point in Salmonella typhimurium /." 1999. http://catalog.hathitrust.org/api/volumes/oclc/45370193.html.

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31

Lee, Chin-Hsiung, and 李俊雄. "Study of Sensitivity to Purine Metabolism in Man." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/63409422535304573812.

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碩士<br>國立中正大學<br>化學工程研究所<br>93<br>Mathematical modeling of purine metabolism in man was shown with regard to Michaelis-Menten (MM) model which was difficult to study on analysis of sensitivity. Therefore, we transferred MM model into GMA model with power-law approximation, Methematica software tools and simulated its dynamic behavior in response to different operating points. From the simulating result of rate constant analysis, we could find the concentration change of ARNA, APRT, GPRT, HPRT, GRPT, and ASLI enzymes would brought about the abnormalities in purine metabolism.. Alternatively, we

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32

Sundaresh, C. S. "Studies on purine metabolism in retinal difficiency and protein-energy malnutrition." Thesis, 1985. http://hdl.handle.net/2009/1776.

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33

Crouch, Neil Robert. "Effect of auxin on 6-(benzylamino)purine metabolism in suspension cultures." Thesis, 1993. http://hdl.handle.net/10413/10490.

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A review of the literature indicated that the purine cytokinin 6-(benzylamino)purine (SA) may be converted to a wide range of metabolites. Although the functional significance of these metabolites remains obscure, cytokinin physiologists have essentially classed them as either active or inactive. Inactivation of cytokinins is considered to proceed via catabolic oxidation (side-chain cleavage), or N-conjugation with glucose or alanine moieties. The literature survey was hampered by the confusing array of synonyms which have been coined for cytokinin metabolites. Accordingly, a working system of

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34

Stathis, Christos. "The effect of sprint training on human skeletal muscle purine nucleotide metabolism." Thesis, 1994. https://vuir.vu.edu.au/15387/.

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The major focus of this thesis was to examine the effect of sprint training on skeletal muscle purine nucleotide (PnN) metabolism. Specifically, this thesis studied the effects of sprint training on skeletal muscle PnN and metabolites of purine catabolism at rest, during a 30 s "all out" cycle bout and after 3 min of recovery. Furthermore, the accumulation of purine degradation prcducts in the plasma (ammonia, hypoxanthine) during exercise, and in recovery from a 30 s "all out" sprint was also examined. Finally, this thesis studied the influence of sprint training on performance variables per

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35

Papinazath, Taniya. "The Effects of Purine Nucleoside Phosphorylase (PNP) Deficiency on Thymocyte Development." Thesis, 2010. http://hdl.handle.net/1807/24616.

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PNP is a crucial enzyme in purine metabolism, and its inherited defects result in severe T-lineage immune deficiency in humans. I hypothesized that PNP deficiency disrupts the development of late CD4-CD8- double negative (DN) thymocytes and induces mitochondrial-mediated apoptosis of CD4+CD8+ double positive (DP) thymocytes. By using PNP-deficient (PNP-/-) mice as well as an OP9-DL1 co-culture system simulating PNP-deficient conditions, I demonstrated that PNP deficiency interferes with the maturation of DN thymocytes at the transition from DN3 to DN4 stage. Although PNP deficiency does not

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36

Mohamedali, Khalid Amanali. "The role of mouse adenosine deaminase in purine metabolism: Physiological and mechanistic aspects." Thesis, 1994. http://hdl.handle.net/1911/16758.

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Recent studies on the tissue distribution and developmental regulation of ADA activity in mice show that very high ADA levels exist in the murine alimentary tract (tongue, esophagus, forestomach, proximal small intestine) and at the fetal-maternal interface. Levels of three other enzymes involved in purine catabolism--purine nucleoside phosphorylase (PNP), guanine deaminase (GDA), and xanthine dehydrogenase (XDH)--were measured and compared with ADA activity. The highest levels of PNP, GDA and XDH were found in the proximal small intestine. Levels of these three enzymes were much lower in the

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