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Rozprawy doktorskie na temat „Chemical studies”

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Data publikacji: 3 czerwca 2025
Data aktualizacji: 31 lipca 2025

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1

McAleese, Anthony Joseph. "Chemical studies of Rhododendron." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/15307.

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This work is divided into two main parts, the first looking at <i>Rhododendron</i> growth on limestone soils, both domestic (horticultural) and Chinese (wild), and the second looking at taxonomic trends in the leaf wax hydrocarbons of subsection Taliensia using Gas Chromatography. Analysis of <i>Rhododendron </i>plants growing on limestone soils was carried out using ICP-AES to look at levels of eight elements in the leaves and their availability in soils. Results showed that Ca and Mg concentrations and pH were correlated closely and loosely inverse to these were Cu, Fe and Mn concentrations
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2

Heard, Dwayne Ellis. "Laser studies of chemical kinetics." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258025.

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3

Smiley, Diane. "Chemical studies on cyclopentanoid biosynthesis." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336904.

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4

Gharat, Laxmikant Atmaram. "Chemical studies on serotonin analogs." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/187502.

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The major focus of our research has been the design, synthesis and pharmacological evaluation of serotonin or 5-hydroxytryptamine (5-HT; 1) analogs. These include the conformationally restricted, rigid and semirigid analogs and those with a variety of different substituents, both electron donating and electron withdrawing, on the critically important indole 5-position. Two most interesting analogs in the tryptamine series are 5- carboxamidotryptamine (5-CT; 3a), a potent agonist at 5-HT₁ receptor and N,N-dipropyl- 5-carboxamido tryptamine (5-DPCT; 3b), a potent and selective agonist at the 5-H
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5

Few, Julian William. "FTIR studies of chemical processes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b7dbc587-fb9e-46de-8f04-44892fde0bf4.

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This thesis presents the study of a selection of gas phase chemical processes using time-resolved Fourier transform infrared (FTIR) emission spectroscopy. Such processes include molecular energy transfer, chemical reaction and photodissociation. The major focus of this thesis was the investigation of collisional energy transfer from the electronically excited states of NO and OH, with particular attention paid to the fate of the electronic energy. NO A<sup>2</sup>&Sigma;<sup>+</sup>(v = 0) is prepared by laser excitation, pumping the overlapped Q<sub>1</sub> and P<sub>21</sub> band heads of th
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6

Gilchrist, Alexander J. "Laser studies of chemical dynamics." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b94974f0-dded-452a-84c1-3242fba530a0.

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In this thesis, resonance enhanced multiphoton ionisation (REMPI) in combination with time-of-flight mass spectrometry (TOF-MS) has been used to detect nascent photofragments resulting from the UV dissociation of a variety of small molecules. The translational anisotropy and angular momentum polarisation of these photofragments has been measured and used to elucidate the underlying photodissociation dynamics. Firstly, the photodissociation of NO<sub>2</sub> at 320nm has been investigated and the vector correlations of the nascent NO photofragments have been measured in terms of a set of semi-c
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7

Denuault, Guy. "Microelectrode studies of chemical reactions." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/179323/.

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Neumann's integral theorem has been used to establish exact analytical solutions for chronoamperometric experiments and for the steady state limiting current for CE and catalytic EC mechanisms. To convert these solutions into a useful form, FORTRAN programs have been written for the necessary numerical calculations. The analytical response of microdiscs, for chronoamperometry as well as the steady state for CE and EC' reactions is presented. A different theoretical approach, as well as digital simulations, are used for the interpretation of steady state limiting currents for EC' reactions, in
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8

Sabbagh, Liezel Veronica. "Chemical studies of chromone derivatives." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1006899.

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This study has focussed on several aspects of chromone chemistry, viz., (i) the influence of remote substituents on the basicity of 2-(N,N-dimethylamino)chromones, (ii) MoritaBaylis-Hillman reactions of substituted chromone-3-carbaldehydes and (iii) an investigation into the application of chromone chemistry in the total synthesis of the marine natural product, Rietone A. Selected 2-(N,N-dimethylamino )chromones were prepared using two different methods; firstly, via cyclisation of salicylate-derived N,N-dimethyl-3;.(2-hydroxyphenyl)-3- oxopropanamide precursors and, secondly, via 2-hydroxyace
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9

Gelebe, Aifheli Carlson. "Chemical studies of 1,5-benzodioxepanones." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1006895.

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Chromone and flavanone derivatives were prepared by condensation of the corresponding 2-hydroxyacetophenones (with diethyl oxalate or the appropriate aromatic aldehyde respectively) and cyclisation of the condensation products. Saeyer-Villiger rearrangement of these flavanones, with MCPBA, resulted in expansion of the C-ring. Spectroscopic techniques have been used to establish the regioselectivity of the rearrangement and hence, the identity of the rearranged products as 1,5-benzodioxepan-4-ones. The 1,5-benzodioxepan-4-ones were subjected to detailed ¹H and ¹³C n.m.r. analysis and a combinat
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10

Hutson, Melinda Lee 1953. "Chemical studies of enstatite chondrites." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290633.

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The unique mineral and chemical composition of enstatite chondrites has been difficult to explain. Contrary to the conclusions of other workers, there is no evidence for a significant chemical difference between EH and EL chondrites, except in bulk S. Analyzed splits of the enstatite chondrites vary widely in major element composition, largely as a result of analyzing inadequate sample sizes. The phases in enstatite chondrites most likely to reflect conditions in the solar nebula include enstatite, forsterite, diopside, silica polymorph, albite, metal, troilite, oldhamite, niningerite, schreib
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11

Proffitt, Simon. "Surface chemical studies of chemical vapour deposited diamond thin films." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393996.

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12

Coleman, John Edward. "Chemical studies of Pacific Ocean sponges." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27122.pdf.

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13

Hayes, Michael Y. "Theoretical studies of chemical reaction dynamics." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3273678.

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14

Morrell, Claire. "FTIR emission studies of chemical processes." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326026.

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15

Ritchie, Grant A. D. "Laser studies of chemical reaction dynamics." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325785.

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16

Jordan, Peter A. "Physico-chemical studies of aluminium biochemistry." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294654.

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17

Dunkerley, Samantha. "Novel studies in automatic chemical analysis." Thesis, University of Wolverhampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361981.

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18

Akerman, Christopher John. "Chemical abundance studies, near and far." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613697.

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19

Henzing, Alexander John. "Chemical & biochemical studies of Caspases." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/15007.

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Caspases are cysteine-dependent aspartate-directed proteases responsible for the proteolysis of a plethora of substrates during programmed cell death. These include structural proteins of the cytoplasm and nucleus, components of the DNA repair machinery, protein kinases, signalling proteins and regulatory proteins. Caspases are synthesised as relatively inactive zymogens, that become activated by scaffold-mediated transactivation or <i>via</i> cleavage by upstream proteases in an intracellular cascade. The resulting heterotetrameric enzymes possess a unique absolute requirement for aspartate a
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20

Russell, Janelle P. N. "Chemical and Biochemical Studies of Bacillithiol." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1347888245.

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21

Billington, David Charles. "Chemical studies of biologically useful molecules." Thesis, Aston University, 2004. http://publications.aston.ac.uk/21769/.

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22

Guthrie-Strachan, Jeffry James. "Chemical studies of necic acid analogues." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1006909.

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Various aldehydes have been reacted with methyl acrylate under Baylis-Hillman conditions, using DABCO as a catalyst, to afford a range of α-substituted acrylic esters containing an allylic hydroxy group. Selected Baylis-Hillman products have been brominated, hydrolysed and acetylated to afford substrates for the synthesis of necic acid analogues. The diastereo- and regioselectivity of nucleophilic attack, using sodium methylmercaptan, on the Baylis-Hillman products and selected brominated derivatives was investigated. The allylic hydroxy compounds favour conjugate addition with the generation
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23

Nchinda, Aloysius Tchangwe. "Chemical studies of selected chromone derivatives." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1007442.

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This investigation has been geared towards several aspects of chromone chemistry. Selected 2-(N,N-dimethylarnino)chromones have been synthesized via 2-hydroxyacetophenone boron difluoride complex intermediates, and potentiometric analysis of these compounds in ethanolwater has been used to determine the influence of substituents on their basicity. The pKa values have been found to lie within a narrow range (1.92 - 2.52), and the observed substituent effects have been rationalized with the aid of semi-empirical and ab initio molecular orbital calculations. An efficient route has been developed
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24

Powell, Francis E. "Physico-chemical studies in flow analysis." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/25925.

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The first part of this study was the characterisation of an impinging jet electrode in an amperometric detector; the device having found extensive application in flow injection analysis. A voltammetric study of the detector in the stopped flow mode was carried out and evidence is presented of restricted diffusion imposed by the shallow depth of the cell. In hydrodynamic voltammetry, the detector exhibited a gradual progression from thin-layer to wall jet behaviour as the flow rate increased. This gradation is discussed in terms of a model in which flow in the electrode chamber forms concentric
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25

Lau, Kai Chi. "Quantum chemical studies of anti-cancer complexes /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17547.

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26

Hopmann, Kathrin H. "Quantum chemical studies of epoxide-transforming enzymes." Licentiate thesis, Stockholm : Department of Theoretical Chemistry, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4390.

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27

Hammar, Peter. "Quantum Chemical Studies of Enantioselective Organocatalytic Reactions." Licentiate thesis, Stockholm : Bioteknologi, Biotechnology, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4701.

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28

Grewal, Harjap Singh. "Studies of selective chemical catalysis by hydrolases." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78370.

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Hydrolase catalyzed reactions are used for selective chemical catalysis. With directed evolution, rational mutations and molecular modeling the selectivity of these hydrolases can be increased and the origin of selectivity determined. This study investigates four selective hydrolase catalyzed reactions. Using molecular modeling the unusual regioselectivity of Pseudomonas cepacia lipase (PCL) and the selectivity of Candida antarctica B lipase (CAL-B) in nucleoside acylation reactions has been attributed to the binding of the nucleoside base within the active site. The enantio-selectivity
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29

Xu, Cigang. "Chemical studies of single-walled carbon nanotubes." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393517.

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30

Moore, Emily L. "Laser studies of gas phase chemical reactions." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320640.

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31

Oum, Kawon. "Laser studies of gas phase chemical processes." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318810.

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32

Powner, Matthew W. "Studies towards a chemical origin of RNA." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499949.

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33

Al-Ibadi, Muhsen Abood Muhsen. "Quantum chemical studies of organometallic reaction mechanisms." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547444.

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34

Farahani, Pooria. "Theoretical Studies of Seemingly Simple Chemical Reactions." Licentiate thesis, Uppsala universitet, Teoretisk kemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-228291.

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35

Yaempongsa, Dhebbajaj. "Quantum Chemical studies of New Energetic molecules." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145859.

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36

Larcin, José. "Chemical and electrochemical studies of Leclanché cells." Thesis, Middlesex University, 1991. http://eprints.mdx.ac.uk/13367/.

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The densities of NH4CI-ZnCI2 solutions were measured at 25°C over a wide range of concentrations and a calculation procedure was derived assuming ideal mixing of solutions of NH4CI, ZnCl2, and the complex (NH4)ZnCI3 which accurately predicted the measured densities within plus/minus 0.7 %. The question of the NH4CI concentration at which the precipitate formed on discharge changes from Zn(NH3)2Cl2 to ZnCI2.4Zn(OH)2.H20 has been clarified and the free energies of formation of both products have been determined, for the first time for ZnCI2.4Zn(OH)2.H20. The zinc electrode potential was measured
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37

Hernandez, Marcos Soto. "Structural and chemical studies of Erythrina alkaloids." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254498.

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38

Al-Hakim, M. M. R. "Radiation chemical and spectroscopic studies of lipoxygenase." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372141.

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39

Preece, N. E. "Studies on chemical-induced autoxidation in vivo." Thesis, University of Surrey, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376361.

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40

Gkionis, Konstantinos. "Quantum chemical studies of metal-DNA interactions." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/55045/.

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A series of density functional theory (DFT) and quantum mechanics/molecular mechanics (QM/MM) calculations are used to investigate the binding of platinum and ruthenium anticancer drugs to DNA. The qualitative and quantitative features of Becke's half-and-half (BHandH) functional for calculating geometries, binding energies and harmonic frequencies of non- covalently bound systems are tested and the intermolecular interactions are characterised and quantified using the QTAIM electron densities. Application of this DFT-QTAIM approach to complexes of the type (n6-arene)Ru(en)(nucleobase) 2+ show
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41

Bunyan, Kerry Emma. "Chemical and biological studies of manganese transferrin." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/15569.

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This thesis is concerned with the loading of transferrin with manganese and some of its chemical and biological properties. Manganese is bound to transferrin as Mn(III) with a characteristic ligand (Tyr) to metal (Mn(III) charge-transfer band at a wavelength of 430 nm. Caeruloplasmin is shown to enhance the uptake of manganese from MnC1<sub>2</sub> by apo-hTf. However binding is often incomplete and slow. A novel method of loading hTf with Mn using KMnO<sub>4</sub> is reported. This method leads to rapid uptake and inductively coupled plasma atomic emission spectroscopy (ICP-AES) determinants
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42

Thinnes, Cyrille Christophe. "Chemical and biological studies on human oxygenases." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:455f2e65-f294-461b-b44f-cd53796b14a0.

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As depicted in Chapter I, 2-oxoglutarate- (2OG) dependent oxygenases are ubiquitous in living systems and display a wide range of cellular functions, spanning metabolism, transcription, and translation. Although functionally diverse, the 2OG oxygenases share a high degree of structural similarities between their catalytic sites. From a medicinal chemistry point of view, the combination of biological diversity and structural similarity presents a rather challenging task for the development of selective small molecules for functional studies in vivo. The non-selective metal chelator 8-hydroxyqui
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43

Lee, Shoei-Sheng. "Chemical and spectral studies of Thalictrum alkaloids /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487263399025198.

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44

Maciejczyk, Malgorzata. "1,3,2-Benzodiazaboroles : synthetic and physico-chemical studies." Pau, 2010. http://www.theses.fr/2010PAUU3008.

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There is considerable current interest in conjugated organic compounds containing threecoordinate boryl substituents as π-acceptors, as the vacant pz-orbital on boron is capable of significant interaction with an organic π-system. But as boron is less electronegative than carbon, the boryl moiety may also act as α-donor. These boron containing compounds exhibit intriguing fluorescence emission, second and third order non-linear optical properties and fluoride sensing ability. They can serve as emissive and/or electron-transport layers in organic light emitting devices (OLED). Materials with ph
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45

Manta, Bianca. "Quantum Chemical Studies of Enzymatic Reaction Mechanisms." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141321.

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Computer modeling of enzymes is a valuable complement to experiments. Quantum chemical studies of enzymatic reactions can provide a detailed description of the reaction mechanism and elucidate the roles of various residues in the active site. Different reaction pathways can be analyzed, and their feasibility be established based on calculated energy barriers. In the present thesis, density functional theory has been used to study the active sites and reaction mechanisms of three different enzymes, cytosine deaminase (CDA) from Escherichia coli, ω-transaminase from Chromobacterium violaceum (Cv
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46

Liljenberg, Magnus. "Quantum Chemical Studies of Aromatic Substitution Reactions." Doctoral thesis, KTH, Tillämpad fysikalisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206964.

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In this thesis, density functional theory (DFT) is used to investigate the mechanisms and reactivities of electrophilic and nucleophilic aromatic substitution reactions (SEAr and SNAr respectively). For SEAr, the σ-complex intermediate is preceded by one (halogenation) or two (nitration) π-complex intermediates. Whereas the rate-determining transition state (TS) for nitration resembles the second π-complex, the corresponding chlorination TS is much closer to the σ-complex. The last step, the expulsion of the proton, is modeled with an explicit solvent molecule in combination with PCM and confi
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47

Davidson, Deborah Nicole. "Chemical and spectroscopic studies of chromone derivatives." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1006857.

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Various chromone derivatives have been used in asthma therapy, and their biological activity is apparently related to certain chemical features which include conformation and acidity. In the present study, substituent effects on conformation and acidity have been explored in chromone systems with potential biological activity. A range of variously substituted symmetrical chromone-2-carboxamides (including a series of N,N-dimethylchromone-2-carboxamides) have been prepared via chromone-2-carboxylic acids, which, in turn, were prepared from the corresponding o-hydroxyacetophenones. The N,N-dimet
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48

Ramaite, Ipfani David Isaiah. "Chemical and spectroscopic studies of chromone derivatives." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1006888.

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A number of biologically active chromones occur in plants (eg. Khellin) and research in this field has eventually led to the discovery of chromoglycic acid, which is widely used as a sodium salt in asthma therapy. Since biological activity may be related to acidity, a range of chromone-2-carboxylic acids have been prepared via Claisen acylation of substituted o- hydroxyacetophenones and their acid dissociation constants determined potentiometrically to explore substituent effects. From this study it has been found that introduction of certain groups does have a marked effect on acidity. A vari
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49

Islam, Saidul. "Studies towards the chemical origins of life." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/studies-towards-the-chemical-origins-of-life(afeac977-39db-4caa-bcbc-63643f5e9f3e).html.

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The 'RNA World' hypothesis states that RNA was the first living system on the primitive Earth, where it carried out dual genotypic and phenotypic functions. Therefore, RNA must have self-assembled by purely chemical means from small prebiotic feedstock molecules. A plausible demonstration of the synthesis of RNA with the natural [5'→3'] phosphodiester linkage, and its self-replication has not been achieved so far. Some have speculated a 'simpler' informational polymer preceded it, and biology based on this polymer subsequently 'invented' RNA. The structurally simpler L-α-threofuranosyl nucleic
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50

Sobrado, Pablo. "Studies of the chemical mechanisms of flavoenzymes." Texas A&M University, 2003. http://hdl.handle.net/1969/565.

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