Дисертації з теми "Complex substrates"
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Alhijjaji, Fariha. "Studies on the microbial degradation of complex substrates." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/10040/.
Повний текст джерелаSelander, Nicklas. "Catalytic Functionalization of Allylic Substrates by Palladium Pincer Complexes." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-39065.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 11: In press.
Thoresen, Mariska. "An investigation into the synergistic action of cellulose-degrading enzymes on complex substrates." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017915.
Повний текст джерелаGössl, Illdiko Maria. "Supramolecular structures of dendronized polymers and DNA on solid substrates." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2003. http://dx.doi.org/10.18452/14893.
Повний текст джерелаComplexes of oppositely charged polyelectrolytes play an important role in both biology and material science, for instance DNA condensation in vitro, nucleosomal structure, non-viral gene transfection systems as well as layer-by-layer adsorption. Although there are theories predicting overcharging of polyelectrolyte complexes, the driving forces are still under debate and systematic experimental studies on single polyelectrolytes remain challenging. Therefore the question arose if it is possible to analyze single polyelectrolyte complexes, using DNA and dendronized polymers, with the scanning force microscope in order to investigate the complexation in detail. For the complex analysis, the polyelectrolytes were allowed to interact in solution and then to adsorb on negatively charged mica or on mica coated with a positively charged polymer. Scanning force microscopy was used to investigate the adsorbed species. DNA/dendronized polymer complexes of charge ratio of 1/1 through 1/0.7 adsorbed on mica coated with a positively charged polymer. The analysis of high resolution molecular images indicated that DNA wraps around the dendronized polymer with an estimated pitch of (2.30 ± 0.27) nm and (2.16 ± 0.27) nm for dendronized polymers of generation two and four, respectively. In the proposed model the polyelectrolyte with the smaller linear charge density is wrapped around the more highly charged dendronized polymer, resulting in a negatively overcharged complex. This overcharging is consistent within recent theories of spontaneous overcharging of complexes of one polyelectrolyte wrapping around the other. Using the complex of DNA and dendronized polymers of second generation, the influence of monovalent salt concentration on the molecular structure was studied. By increasing the salt concentration the pitch showed a minimum as predicted by the interplay of electrostatic forces and entropic interactions of polyelectrolyte adsorption. At high salt concentration (2.4 M NaCl) the release of DNA from the complex can be observed. The results showed that the DNA/dendronized polymer system can be used as a new, high potential model system to investigate single polyelectrolyte interactions. With regard to recent theories, the experimental results indicate that the overcharging of the complex is mainly driven by electrostatic forces whereas contributions of counterion entropy and bending energy seem to be negligible. This understanding may be useful for the design of single polyelectrolyte complexes for non-viral gene delivery systems and might help to optimize the transfection efficiency based on the structure of the vector system.
Zich, Judith. "Analysis of Mph1 kinase and its substrates in spindle checkpoint signalling." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/8253.
Повний текст джерелаKothe, Thomas. "Reductive Binding of C‒O and Nitro Substrates at a Pyrazolate-Bridged Preorganized Dinickel Scaffold." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1524-B.
Повний текст джерелаDuan, Peng-Cheng. "A Dinuclear Dihydride Complex for Bimetallic Reductive Activation and Transformation of a Range of Inert Substrates." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-002E-E38C-2.
Повний текст джерелаBakir, Ilyas. "Molecular studies of the γ-secretase complex activity and selectivity towards the two substrates APP and Notch". Thesis, Mälardalen University, School of Sustainable Development of Society and Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9622.
Повний текст джерелаAlzheimer Disease (AD) is the most common neurodegenerative disorder in the world. One of the neuropathological hallmarks of AD is the senile plaques in the brain. The plaques are mainly composed of the amyloid β (Aβ) peptide. Aβ is generated from the amyloid precursor protein, APP, when it is first cleaved by the β-secretase and subsequently the γ-secretase complex. The γ-secretase complex cleaves at different sites, called γ and ε, where the γ-cleavage site generates Aβ peptides of different lengths and ε-cleavage generates the APP intracellular domain (AICD). The two major forms of Aβ is 40 and 42 amino acids long peptides, where the latter is more prone to aggregate and is the main component in senile plaques. The γ-secretase complex is composed of four proteins; Pen-2, Aph-1, nicastrin and presenilin (PS). The PS protein harbours the catalytic site of the complex, where two aspartate residues in position 257 and 385 (Presenilin 1 numbering) are situated. Most Familial AD (FAD) mutations in the PS gene cause a change in the γ-cleavage site, leading to a shift from producing Aβ40 to the longer more toxic variant Aβ42. Frequently, this often leads to impairments of the AICD production. Another substrate for the γ-secretase complex is Notch. It is important to maintain the Notch signaling since an intracellular domain (NICD) is formed after cleavage by the γ-secretase complex in the membrane (S3-site) and this domain is involved in transcription of genes important for cell fate decisions.
It has been reported that certain APP luminal juxtamembrane mutations could drastically alter Aβ secretion, however their effect on AICD production remains unknown. In this study we want to analyse wether the juxtamembrane region is important for the AICD production. To gain more insight into the luminal juxtamembrane function for γ-secretase-dependent proteolysis, we have made a juxtamembrane chimeric construct. A four-residue sequence preceding the transmembrane domain (TMD) of APP (GSNK), was replaced by its topological counterpart from the human Notch1 receptor (PPAQ). The resulting chimeric vector C99GVP-PPAQ and the wildtype counterpart were expressed in cells lacking PS1 and PS2 (BD8) together with PS1wt. We observed that the chimeric construct did not alter production of AICD when using a cell based luciferase reporter gene assay monitoring AICD production. We also introduced a PS1 variant lacking a big portion of the large hydrophilic loop, PS1∆exon10, since our group has previously observed that this region affect Aβ production143. We found that the absence of the large hydrophilic loop in PS1 gave a 2-fold decrease in AICD-GVP formation from C99GVPwt compared to PS1wt. The activity of PS1wt and PS1Δexon10 using C99GVP-PPAQ as a substrate gave similar result as the C99GVPwt substrate, i.e. a 2-fold decrease in AICD-GVP formation when comparing PS1Δexon10 with PS1wt. From this data we therefore suggest that the four residues in the juxtramembrane domain (JMD) (GSNK) is not altering ε-cleavage of APP when changed to Notch1 counterpart, PPAQ. Furthermore, we also show that the 2-fold decrease in AICD-production by the PS1Δexon10 molecule is not changed between the two substrates C99GVPwt and C99GVP-PPAQ. This indicates that the luminal region of APP is not directly involved in the ε-site processing. If the luminal region is affecting processing in the γ-cleavage sites, remains however to be investigated.
Cowan, James. "The development and study of chelating substrates for the separation of metal ions in complex sample matrices." Thesis, University of Plymouth, 2002. http://hdl.handle.net/10026.1/1881.
Повний текст джерелаStefani, Nicola. "Energy from crops: experimental study and dynamic simulation of biogas production by anaerobic digestion of complex substrates." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4506.
Повний текст джерелаAnaerobic digestion (AD) is a biological process which allows the removal of high organic-loading and potentially polluting substances by their transformation into biogas, a mixture of methane and carbon dioxide, prevalently. AD presents many other advantages: it has a low energy consumption and low construction costs with a relatively simple plant technology. Actually, since anaerobic bacteria work more efficiently at room temperature or higher, AD can be profitably applied in developing countries. Biogas production is a foundamental parameter of AD because it is the main index to be considered in a process economic evaluation and also because it gives a measure of its efficiency as well. Moreover, biogas production, and more frequently methane production, is often used as an index set to control the process. With the increase of energy price, the specific biogas production (SGP) of primary and residuals crops has become a goal for economic energy supply and, as a consequence, a rapid and effective method for measuring the gas produced has to be put forward, because there is not an accepted international standard yet. The effective knowledge of biogas production rate allows study of the biological process through macroscopic indicators, easily usable in industrial field, as well. The present study concerns the development and the validation of a technique for biogas production measurement and kinetic determination which adopts bench-mark laboratory-scale experiments with complex solid substrates, i.e. primary and residual energy crops. A laboratory-scale plant was designed and put up to perform this task. The equipment permits to carry out 4 contemporary tests because it is composed of 4 independent gas-lines, each of which connecting an anaerobic reactor to a gas-meter. Data from the experiments were continuously recorded by a data logger. The equipment was tested with synthetic substrate feeds of ethanol and sodium acetate. By a comparison between experimental gas production data and the theoretical ones, stoichiometrically calculated, the range of the error on methane productions resulted within ± 5%. In addition, the presence of oxygen amounts in the mixture, revealed the inconsistency of a test. These positive results allowed the implementation of different experiments to measure biogas produced from natural substrates. Apple, onion, corn straw, potato and winery wastes mixture were therefore tested in various experiments in order to calculate the SGP and SMA of the different crops. A new mathematical model for the description of complex substrate degradation was developed as well. The model was calibrated on the different biological systems and then applyed on real substrates to carry out their COD fractionation, to analyse the biological variable trends and to test the reliability of results. Finally, the reliability of a procedure for the evaluation of a two-step AD as compared to the one-step AD was tested by using apple and potato substrates.
La digestione anaerobica è un processo biologico che permette la rimozione di sostanze con alto carico organico, potenzialmente inquinanti, e la trasformazione di queste in biogas, costituito prevalentemente da metano e anidride carbonica. La digestione anaerobica ha anche ulteriori vantaggi: ha un basso consumo energetico, bassi costi di costruzione degli impianti, uniti ad una tecnologia impiantistica relativamente semplice. Inoltre, poiché i batteri anaerobici lavorano meglio a temperatura ambiente o superiore, si può applicare con profitto nei paesi in via di sviluppo. La produzione di biogas è un parametro fondamentale della digestione anaerobica perché è il principale indicatore cui fare riferimento nella valutazione economica del processo e perché allo stesso tempo fornisce anche una stima della sua efficienza. Inoltre, la produzione di biogas, o ancor più frequentemente quella di metano, è spesso usata come indice cui fare riferimento per un controllo di processo. Con l'aumento del costo energetico, risulta necessario definire correttamente ed efficacemente un metodo di misura del biogas prodotto, in particolare la produzione specifica (SGP) di biogas da biomasse primarie e residuali. Ad es, il test di attività metanogenica specifica (SMA), non ha ancora uno standard internazionale riconosciuto. La conoscenza effettiva della velocità di produzione di metano, infatti, apre la strada alla possibilità di studiare il processo biologico attraverso indicatori macroscopici, facili da applicare anche in un contesto industriale. Il presente lavoro riguarda lo sviluppo e la validazione di un metodo per effettuare la misurazione del biogas e la determinazione delle cinetiche di processo con esperimenti in scala di laboratorio effettuati su substrati complessi, ovvero biomasse primarie e residuali. Per fare ciò, è stato progettato e realizzato un impianto in scala di laboratorio. L'apparecchiatura permette di effettuare 4 prove contemporanee perché è provvista di 4 linee gas indipendenti, ciascuna delle quali connette un reattore anaerobico ad un gasometro. All'impianto è stato affiancato un sistema automatico di acquisizione dati, che permette la registrazione in continuo dei dati di produzione. L'impianto è stato verificato utilizzando alimentazioni di substrati sintetici quali etanolo e acetato di sodio. A seguito del confronto tra i dati di produzione di gas sperimentale e quelli di produzione teorica, calcolata stechiometricamente, l'errore nella risposta è risultato essere contenuto tra i valori di ± 5%. In aggiunta, la verifica del contenuto in ossigeno della miscela ha permesso di scartare le prove non conformi. Questi risultati positivi hanno consentito di passare ad esperimenti condotti su substrati naturali. Sono stati così testati, con i successivi esperimenti, mela, cipolla, patata, paglia di mais e residui solidi della lavorazione del vino, al fine di calcolarne l'SGP e l'SMA. E' anche stato sviluppato un nuovo modello matematico per simulare la degradazione di un substrato complesso. Tale modello è stato dapprima calibrato sui diversi sistemi biologici e in seguito applicato su alcuni substrati reali al fine di operare un frazionamento del COD, analizzare l'andamento delle variabili biologiche e verificare la compatibilità con i risultati sperimentali. Da ultimo, è stata verificata l'affidabilità di una procedura per la valutazione della digestione anaerobica a due fasi e il confronto con quella a fase singola, condotta con campioni di mele e di patate.
XXIII Ciclo
1979
Stastny, Angela. "Stoichiometric Delivery of Halogens to Substrates and a Study of Selective Bromination of Olefins by a Pt(IV) Complex." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523629125459729.
Повний текст джерелаPereira, Vitor Emanuel M. Loureiro S. "Computer model to predict electron beam-physical vapour deposition (EB-PVD) and thermal barrier coating (TBC) deposition on substrates with complex geometry." Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/5714.
Повний текст джерелаShin, Seunghoon. "Part I. Water-soluble organometallic catalysts for asymmetric reactions in aqueous media ; Part II. Silylstannylative cyclization of unsaturated substrates catalyzed by Palladium Complex /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486474078048077.
Повний текст джерелаKumar, Abhijeet Verfasser], Tatiana [Akademischer Betreuer] [Gambaryan-Roisman, Peter [Akademischer Betreuer] Stephan, and Klitzing Regina [Akademischer Betreuer] von. "Wetting, evaporation and deposition processes in interaction of complex liquid formulations with porous substrates / Abhijeet Kumar ; Tatiana Gambaryan-Roisman, Peter Stephan, Regina von Klitzing." Darmstadt : Universitäts- und Landesbibliothek, 2020. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-142114.
Повний текст джерелаKumar, Abhijeet [Verfasser], Tatiana [Akademischer Betreuer] Gambaryan-Roisman, Peter [Akademischer Betreuer] Stephan, and Klitzing Regina [Akademischer Betreuer] von. "Wetting, evaporation and deposition processes in interaction of complex liquid formulations with porous substrates / Abhijeet Kumar ; Tatiana Gambaryan-Roisman, Peter Stephan, Regina von Klitzing." Darmstadt : Universitäts- und Landesbibliothek, 2020. http://d-nb.info/1222163195/34.
Повний текст джерелаKriegel, Sébastien. "Transformation of a membrane protein from the respiratory chain into a sensor for the analysis of its interaction with substrates, inhibitors and lipids." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01017392.
Повний текст джерелаDuan, Peng-Cheng [Verfasser], Franc [Akademischer Betreuer] Meyer, Franc [Gutachter] Meyer, and Sven [Gutachter] Schneider. "A Dinuclear Dihydride Complex for Bimetallic Reductive Activation and Transformation of a Range of Inert Substrates / Peng-Cheng Duan ; Gutachter: Franc Meyer, Sven Schneider ; Betreuer: Franc Meyer." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1155004418/34.
Повний текст джерелаStitou, Bachir. "Emploi de nouveaux systemes catalytiques pour la carbonylation d'alcenes et de substrats insatures fonctionnalises." Toulouse 3, 1988. http://www.theses.fr/1988TOU30028.
Повний текст джерелаMatyskiela, Mary E. "Substrate binding by the anaphase-promoting complex." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2009. 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:3378672.
Повний текст джерелаPauthe, Emmanuel. "Approches cinétiques et moléculaires de la reconnaissance enzyme-substrat : application à l'étude de l'activité protéolytique de la thermolysine." Compiègne, 1998. http://www.theses.fr/1998COMP1139.
Повний текст джерелаDe, Souza Roberto Fernando. "Etude des reactions d'oligomerisation, isomerisation et polymerisation de substrats insatures catalysees par des complexes allyle cationiques du nickel." Toulouse 3, 1987. http://www.theses.fr/1987TOU30152.
Повний текст джерелаDavis, Kelly Lawrence. "Substrate noise coupling in a complex mixed signal integrated circuit." Honors in the Major Thesis, University of Central Florida, 1998. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/30.
Повний текст джерелаBachelors
Engineering
Electrical Engineering
Hart, Kathryn Jacoba. "A RAPID PROTOTYPING METHOD FOR CONSTRUCTING A COMPLEX THREE-DIMENSIONAL SUBSTRATE." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/217.
Повний текст джерелаRamsay, Bruce A. "The use of complex toxic industrial waste as a fermentation substrate /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75450.
Повний текст джерелаNVR was found to be toxic to microorganisms. None grew in enrichment culture containing 2.0% NVR. P. cepacia was the most resistant microorganism found. It could grow well in up to 1.3% NVR. It also grew on butanoic, pentanoic, and hexanoic acid as well as 6-hexanolactone. These were found to be the major toxic components of NVR. P. cepacia was grown in a NVR-limited chemostat with a NVR feed concentration well in excess of the toxic NVR concentration. In nitrogen-limited, batch fermentation on fructose, P. cepacia accumulated PHB in excess of 50% of its dry weight. A 2-stage chemostat process for the production of PHB from NVR by P. cepacia was investigated with encouraging results.
Nilsson, Håkan. "Substrate water binding to the oxygen-evolving complex in photosystem II." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-86500.
Повний текст джерелаWebster, Michael William. "Mechanisms of mRNA substrate-selection by the Ccr4-Not deadenylase complex." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267813.
Повний текст джерелаChauhan, Hitesh. "Protein-protein interaction and substrate channelling in the pyruvate dehydrogenase complex." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620982.
Повний текст джерелаBailey, Matthew. "Deciphering the "Polarity Code": the Mechanism of Par Complex Substrate Polarization." Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22782.
Повний текст джерела2019-05-08
Dahl, Mads Ronald. "Mannan-binding lectin (MBL) associated serine protease-3 (MASP-3) : complex formation in serum and plasma, conditions required for the conversion of the zymogen form into a two-chain serin protease, and a search for substrates using recombinant material produced by stable expression in eukaryotic cell lines." Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/29483.
Повний текст джерелаLu, Lei. "Alterations in activity and specificity of intracellular proteolysis in disease pathogenesis /." Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-397-3/.
Повний текст джерелаBurcher, Benjamin. "Novel low-oxidation state iron complexes : reactivity towards unsaturated substrates." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF022.
Повний текст джерелаIn this thesis our aim was to study the reactivity of phosphine-based low-valent iron complexes towards unsaturated substrates. This goal is part of a wider approach of access to an iron catalytic system able to transform ethylene in a selective manner, by the reaction of oligomerization, towards short linear alpha-olefins (1-butene, 1-hexene, 1-octene), which is unreported in the literature. To achieve this, going through the metallacyclic mechanism of ethylene transformation is the most likely way. However, the electronic and geometrical features of the ligand required to follow this mechanism, and in particular the key step of the oxidative coupling of two molecules of ethylene to the metal center, are ill-defined. We thus report here in a first part the synthesis of a library of P-based iron(II) and iron(III) complexes bearing varied electronic and geometrical features. These novel complexes are opportunistically screened as catalysts for ethylene oligomerization on one hand, and as in situ reduced species in association with dienes (isoprene, butadiene) leading to the polymerization of the latter substrates, on the other hand. In order to get closer to our goal of access to low-valent iron complexes, the use of a one-pot reduction methodology under mild conditions is reported, leading to the isolation and characterization of nine 18- and 16-electron iron(0) complexes. Even though they do not show reactivity towards ethylene or longer olefins, we demonstrate the ability of these complexes to promote reactions involving the oxidative coupling elementary step of unsaturated substrates (alkynes), the catalytic coupling of ethylene and butadiene and the activation of various compounds such as silanes and organic halides, representing a first milestone towards their optimization and application as catalysts for other reactions, including potentially in the near future, for ethylene transformation
Seeba, Marten. "Bioinspired dinuclear copper complexes for catalytic oxidation of phenolic substrates." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-002E-E4DC-8.
Повний текст джерелаAl-Salih, T. "The electrosynthesis of metal complexes from the molecular substrates, N2̲, H2̲, CO and isocyanides." Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377062.
Повний текст джерелаBlons, Charlie. "Complexes organométalliques d'or(III) et de cuivre(III) et leur réactivité vis-à-vis des substrats π". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30248/document.
Повний текст джерелаThe present work deals with the synthesis of Au(III) and Cu(III) compounds and the study of their stability and reactivity toward p substrates. An experimental and theoretical approach has been used in order to access complexes capable of undergoing migratory insertion processes. The first chapter delivers a bibliographic overview of the organometallic chemistry of gold and copper. The importance of the high oxidation state +III is highlighted by the description of important examples having contributed to the understanding of processes associated to the access and reactivity of Au(III) and Cu(III) complexes. The second chapter describes the synthesis of two p-arene Au(III) complexes by migratory insertion of olefins in the Au-C(sp)2 bond of a (P,C) cyclometallated complex. Interactions between the metallic center and the aromatic systems have been characterized by NMR, DFT and XRD for one of the complexes. Based on this insertion reactivity, a process of direct arylation of ethylene has been evidenced. The third chapter concerns the development of an intermolecular hydroarylation of alkynes process, catalyzed by [(P,C)Au(III)(OAcF)2] complexes. These have shown great activity and robustness in presence of trifluoroacetic acid. The reaction has been generalized to a broad substrate scope and a comparative study has been carried on, especially with (N,C) cyclometallated complexes, showing the superiority of (P,C) complexes for the hydroarylation of alkynes. The fourth chapter presents the envisioned strategy to develop a copper-catalyzed oligomerization of ethylene process. A predictive approach based on DFT calculations permitted to evidence easier migratory insertions in the Cu(III)-C bond than in the Cu(I)-C bond. Two strategies for the access to Cu(III) species have been theoretically evaluated. The most favourable calculations have oriented the choice of ligand models used in chapters five and six. The fifth chapter deals with the experimental study related to the first strategy of access to Cu(III) species: the directed intramolecular oxidative addition by peri-iodo napthylphosphine and naphthylamine ligands. [...]
Batista, Denise de Souza. "Vellozia ramosissima: estrutura populacional, anatomia foliar e avalia??o nutricional em ?reas de Complexos Rupestres, sob diferentes substratos, na Serra do Espinha?o, MG." UFVJM, 2016. http://acervo.ufvjm.edu.br/jspui/handle/1/1445.
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O objetivo deste trabalho ? entender os processos ecol?gicos que orientam a distribui??o espacial e estrutura vegetacional da esp?cie Vellozia ramosissima e tamb?m analisar a anatomia foliar, a nutri??o e a ecofisiologia, inter-relacionados com a an?lise do solo, para reconhecer a plasticidade desta esp?cie em ?reas de Complexos Rupestres Quartz?ticos (CRQs) e Ferruginosos (CRFs). A coleta de dados foi baseada na amostragem de uma parcela de 50x50m em quatro ?reas em Complexos Rupestres: duas ?reas localizadas em afloramentos quartz?ticos e duas em ferruginosos. Nas parcelas, todos os indiv?duos com altura maior ou igual a um metro foram mapeados, o padr?o de distribui??o espacial foi avaliado utilizando a fun??o K de Ripley. O m?todo de Sturges foi utilizado para defini??o do n?mero de classes diam?tricas e de altura. As an?lises de solos avaliaram: pH, teores de P, K+, Ca2+, Mg2+ e Al3+; acidez potencial (H+Al), CTC a pH 7,0 (T); CTC efetiva (t), soma de bases (SB), satura??o por bases (V%), satura??o por alum?nio (m%), areia (fina e grossa), silte, argila e equivalente de umidade (EU). Para anatomia foliar foram estimados a ?rea foliar e cortes anat?micos foliares (fotomicrografias). Para cada imagem foram mensurados os par?metros anat?micos: espessura da cut?cula, da epiderme (nas faces adaxial e abaxial), do par?nquima pali??dico e lacunoso, da extens?o da bainha voltada para o feixe vascular (hipoderme), da hipoderme voltada para fenda e altura da fenda estom?tica. O material coletado para a nutri??o foliar e de raiz foi processado e determinados os nutrientes: N; P; K+; Ca2+; Mg2+; Zn2+; Fe2+; Mn2+; Cu; C; H+ e Al3+. O fluor?metro port?til modulado MINI-PAM, foi utilizado para fazer as medi??es pontuais das vari?veis: fotorrespira??o e rendimento qu?ntico efetivo. Nas quatro ?reas foram levantadas o total de 2542 indiv?duos com a seguinte distribui??o: 158 indiv?duos na ?rea CRQ1, 682 na ?rea CRQ2, 39 em CRF1e 1663 em CRF2. A fun??o K de Ripley calculada para as quatro ?reas rejeitaram a hip?tese de completa aletoriedade espacial, demonstrando, no geral, um padr?o de distribui??o agregado. A estrutura diam?trica e de altura das quatro ?reas seguem um aumento gradativo da frequ?ncia de indiv?duos nas quatro primeiras classes, exceto para ?rea CRF1. As an?lises de solos demonstram baixa fertilidade e textura arenosa com baixa capacidade de reten??o de umidade, al?m de toxidade por metais como: Mn2+ e Al3+, para as ?reas CRF2 e CRQ2, respectivamente. H? uma similaridade na organiza??o estrutural da anatomia foliar, nas quatro popula??es, com caracter?sticas t?picas de esp?cies de ambientes xerom?rficos, como: presen?a de cut?cula espessa, fibras subepid?rmicas, hipoderme aqu?fera e sistema vascular bem desenvolvidos, al?m de fendas estom?ticas. Em termos nutricionais a esp?cie apresenta baixos n?veis de requerimentos, foram observados altos concentra??es de metais pesados (Mn2+ e Al3+) nas folhas e ra?zes da esp?cie. As vari?veis ambientais: altitude, temperatura, umidade relativa do ar e radia??o influenciam diretamente na atividade de fotoss?ntese que ? complexa e sujeita a influ?ncias regulat?rias, internas e ambientais. Foram observadas caracter?sticas funcionais como plasticidade representada pela resposta morfo-anat?mica e ecofisiol?gica nesta esp?cie.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016.
The objective of this work is to understand the ecological processes that guide the spatial distribution and vegetative structure of the species Vellozia ramosissima and also to analyze leaf anatomy, nutrition and ecophysiology, interrelated with soil analysis, to recognize the plasticity of this species in Areas of Quartzite Rock Complexes (CRQs) and Ferruginous Complexes (CRFs). Data collection was based on the sampling of a 50x50 m plot in four areas in Rock Complexes: two areas located in quartzitic outcrops and two in ferruginous outcrops. In the plots, all individuals with height greater than or equal to one meter were mapped, the spatial distribution pattern was evaluated using the Ripley's K function. The Sturges method was used to define the number of diametric and height classes. Soil analyzes evaluated: pH, levels of P, K+, Ca2+, Mg2+ and Al3+; Potential acidity (H + Al), CTC at pH 7.0 (T); effective CTC (t), base saturation (SB), base saturation (V%), saturation by aluminum (m%), sand (fine and coarse), silt, clay and moisture equivalent (EU). Leaf anatomy and foliar anatomical sections (photomicrographs) were estimated for leaf anatomy. For each image, the anatomical parameters were measured: cuticle thickness, epidermis (on the adaxial and abaxial sides), palisade and lacunar parenchyma, extension of the sheath facing the vascular bundle (hypodermis), hypodermis facing the Stomatal cleft. The material collected for leaf and root nutrition was processed and the nutrients determined: N; P; K+; Ca2+; Mg2+; Zn2+; Fe2+; Mn2+; Cu; C; H+ and Al3+. The portable MINI-PAM modulating fluorometer was used to make point measurements of the variables: photorespiration and effective quantum yield. In the four areas, a total of 2.542 individuals with the following distribution were surveyed: 158 individuals in the CRQ1 area, 682 in the CRQ2 area, 39 in CRF1 and 1663 in CRF2. The Ripley's K function calculated for the four areas rejected the hypothesis of complete spatial randomness, generally showing an aggregate distribution pattern. The diameter and height structure of the four areas follow a gradual increase of the frequency of individuals in the first four classes, except for CRF1 area. Soil analyzes show low fertility and sandy texture with low moisture retention capacity, as well as toxicity by metals such as: Mn2+ and Al3+, for the areas CRF2 and CRQ2, respectively. There is a similarity in the structural organization of the leaf anatomy, in the four populations, with typical characteristics of species of xeromorphic environments, such as: presence of thick cuticle, subepidermal fibers, well developed hypodermis and vascular system, and stomatal cracks. In nutritional terms, the species presented low levels of requirements, high concentrations of heavy metals (Mn2+ and Al3+) were observed in the leaves and roots of the species. The environmental variables: altitude, temperature, relative air humidity and radiation directly influence the activity of photosynthesis that is complex and subject to regulatory, internal and environmental influences. Functional characteristics were observed as plasticity represented by the morpho-anatomical and echophysiological response in this species.
Bailey, Alan James. "Oxidation of organic substrates catalysed by ruthenium complexes and related species." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283294.
Повний текст джерелаCarpenter, Ian. "Developments in the hydrogenation of challenging substrates utilising transition metal complexes." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6533.
Повний текст джерелаRainford, Christopher Charles. "Early transition metal complexes supported by silanol and crown ether substrates." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338405.
Повний текст джерелаJones, Darran Dafydd. "Protein-domain interactions and substrate channelling in multienzyme complexes." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621518.
Повний текст джерелаSchroeder, Ewald. "Structural studies of #mu#-calpain, a novel calpain substrate, and a papain-leupeptin complex." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386677.
Повний текст джерелаBorba, André Duarte. "Transporte de partículas com autopropulsão em substratos 2d ordenados." reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/11280.
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Self-propelled particles are those that use their internal energy to generate movement. The term is originally associated with the model introduced by T. Vicsek et al.[Phys. Rev. Lett. 75, 1226 (1995)] that identifies a dynamic transition associated to the collective movement of "individuals" of the same species. Examples of SPP occur in natural systems such as microorganisms (bacteria, viruses, and protozoa) or artificially as in the case of colloidal particles suitably prepared. The study of SPP is important in many fields such as materials engineering, medicine and basic sciences (physics and chemistry). In general, the collective motion reveals a dramatically different behavior as compared to the characteristics motion of individual components of a given system. That is, the action of a given individual is dominated by the presence of the other components as a result of the interaction between them. Thus, it is important to understand the collective behavior of SPP. In this dissertation, we study a two-dimensional SPP system subject to an external force and in the presence of rigid obstacles with anisotropic geometry (semi-circle) orderly distributed in the form of a square lattice. In addition to the interaction between particles and between particles and obstacles, the individual movement of each SPP is influenced by a white noise. The objective is to characterize the transport of SPP in a 2D substrate in the absenceand in the presence of a driving external force. We present a systematic study of the collective motion of the SPP as a function of noise intensity, which defines the erratic movement of the SPP, the size of the obstacles, the SPP density and separation between the obstacles. Due to the presence of anisotropic obstacles, there is a spontaneous collective movement and ordered in a given preferential direction, characterized by the non-zero average velocity of SPP in the absence of the external force. The basic conditions for the spontaneous ordered collective movement are: low-intensity noise ( << 1 ) and SPP density greater than a given critical value.
Partículas com autopropulsão, ou do inglês Self Propelled Particles (SPP), são aquelas que utilizam sua energia interna para gerar movimento. O termo está originalmente associado ao modelo introduzido por T. Vicsek et al. [Phys. Rev. Lett.75, 1226 (1995)] que identifica uma transição dinâmica associada ao movimento coletivo de "indivíduos" de uma mesma espécie. Exemplos de SPP ocorrem em sistemas naturais, como microorganismos (bactérias, vírus e protozoários), ou, artificialmente, como no caso de partículas coloidais adequadamente preparadas. O estudo de SPP é importante em diversas áreas do conhecimento tais como engenharia de materiais, medicina e ciências básicas (física e química). Em geral, o movimento coletivo revela características drasticamente distintas do movimento individual dos constituintes de um dado sistema. Ou seja, a ação de um dado indivíduo é dominada pela presença de outros constituintes do sistema como resultado da interação entre eles. Desta forma, é importante o entendimento do comportamento coletivo das SPP. Em particular nesta dissertação, estudamos um sistema bidimensional de SPP sujeitas a uma força externa e na presença de obstáculos rígidos com geometria anisotrópica (semi-círculos) distribuídos ordenadamente na forma de uma rede quadrada. Além da interação entre partículas e entre partículas e obstáculos, o movimento individual de cada SPP sofre influência de um ruído branco. O objetivo é caracterizar o transporte de SPP através do substrato 2D, na ausência ou não de uma força externa propulsora. Apresentamos um estudo sistemático do movimento coletivo das SPP em função da intensidade do ruído, que define o movimento errático das SPP, do tamanho dos obstáculos, da densidade de SPP e da separação entre os obstáculos. Devido a presença de obstáculos anisotrópicos, existe um movimento coletivo espontâneo e ordenado em uma dada direção preferencial, caracterizado por velocidade média das SPP não-nula na ausência de força externa. As condições básicas para o movimento coletivo ordenado espontâneo são: ruído de baixa intensidade (<<1) e densidade de SPP maior que um dado valor crítico.
Shaffer, Justin P., Jana M. U'Ren, Rachel E. Gallery, David A. Baltrus, and A. Elizabeth Arnold. "An Endohyphal Bacterium (Chitinophaga, Bacteroidetes) Alters Carbon Source Use by Fusarium keratoplasticum (F. solani Species Complex, Nectriaceae)." FRONTIERS MEDIA SA, 2017. http://hdl.handle.net/10150/623193.
Повний текст джерелаMadduma-Liyanage, Kumudu C. "Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron Substrates." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506.
Повний текст джерелаOrtiz, Karpf Andrea Lucia. "Bathymetric and substrate controls on submarine mass-transport emplacement processes and channel-levee complex evolution." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15305/.
Повний текст джерелаLima, Jaceline Maria de Negreiros. "Produção do complexo quitosana-polifosfato em Rhizopus oryzae UCP 1506 utilizando substratos agroindustriais." Universidade Católica de Pernambuco, 2013. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=864.
Повний текст джерелаA quitosana é um polissacarídeo natural originado da deacetilação da quitina. É solúvel em ácido devido à presença de grupos amino, livres ao longo da cadeia do polímero. Os fungos de classe Zygomycetes, em especial Rhizopus oryzae, apresenta em suas paredes celulares quitina e quitosana, podendo as mesmas estar ligadas através de proteínas e polifosfato ou outros componentes, respectivamente. O polifosfato é um biopolímero de ampla aplicabilidade na biotecnologia ambiental. A manipueira é o resultado do processo da mandioca prensada para produção de farinha e utilizada como fonte de carbono nos processos fermentativos. A milhocina é um subproduto da produção de amido de milho e considerada como fonte de nitrogênio. Investigações foram realizadas com Rhizopus oryzae em fermentação submersa para produção de biomassa e do complexo quitosana-polifosfato, através do cultivo em rejeito agroindustrial, manipueira suplementado com milhocina, utilizando um planejamento fatorial completo 23 sobre agitação de 150rpm por 96h. O ensaio com a maior quantidade de biomassa e quitosana foi selecionado para realizar uma cinética de crescimento para avaliar a produção de biomassa e do complexo quitosanapolifosfato. Neste sentido, foi utilizado frascos de Erlenmyers de 500mL de capacidade, contendo 100mL do meio formulado, sendo inoculados em 1mL da suspensão de 107 esporos por mL, incubados sob agitação orbital de 150rpm. As amostras foram coletadas a cada 12 horas até o período de 120h. Os resultados obtidos demonstraram um aumento máximo de biomassa com 48h de cultivo em pH 7,3, com produção máxima da quitosana por R. oryzae de 116mg/g de biomassa em 36h de cultivo. O polifosfato complexado à quitosana apresentou maior rendimento em 36h correspondendo a 13mg/mg de quitosana. Devido os resultados obtidos na produção de biomassa e o complexo de quitosanapolifosfato por Rhizopus oryzae, tornaram-se economicamente viáveis devido à utilização de rejeitos industriais para obtenção desses polímeros.
Chitosan is a natural polysaccharide originated from the deacetylation of chitin. It is soluble in acid because of the presence of amino groups, free along the polymer chain. The fungal class Zygomycetes, in particular Rhizopus oryzae, presents in its cell wall chitin and chitosan, and they may be linked through the polyphosphate or proteins and other components, respectively. The polyphosphate is a biopolymer with wide applicability in environmental biotechnology. Manipueira is the result of the process for production of pressed cassava flour and used as carbon source in fermentation processes. The corn steep liquor is a by-product of corn starch and regarded as nitrogen source. Investigations were carried out with Rhizopus oryzae in submerged fermentation for production of biomass and chitosan-polyphosphate complex, through cultivation in agro waste, cassava supplemented with corn steep liquor, using a full factorial design on 23 agitation at 150 rpm for 96h. The test with the greatest amount of biomass and chitosan was selected to perform a growth kinetics to evaluate the production of biomass and chitosan-polyphosphate complex. In this sense, was used bottles of 500ml capacity Erlenmyers containing 100mL of medium formulated being inoculated in 1-ml suspension of 107 spores per ml, incubated under orbital agitation at 150 rpm. Samples were collected every 12 hours until the period of 120h. The results showed a maximum increase of biomass with 48 hours of cultivation at pH 7.3, with maximum production of chitosan by R. oryzae 116mg / g biomass at 36h of cultivation. The polyphosphate complexed to chitosan had the highest yield in 36 h corresponding to 13mg/mg chitosan. Because the results in the production of biomass and chitosan-polyphosphate complex from Rhizopus oryzae, have become economically viable due to the use of industrial wastes to obtain these polymers.
鄧煒堂 and Wai-tong Tang. "Homogeneous oxidation of organic substrates by ruthenium, iron and manganese tertiary amine complexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31231706.
Повний текст джерелаKamp, Norbert W. J. "The catalytic oxidation of phenolic substrates using manganese triazacyclononane complexes and hydrogen peroxide." Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265366.
Повний текст джерелаTang, Wai-tong. "Homogeneous oxidation of organic substrates by ruthenium, iron and manganese tertiary amine complexes /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12355203.
Повний текст джерелаBELTRANI, MICHELA. "Oxidative Carbonylation of Unsaturated Substrates Promoted by Aryl [Alfa]-Diimine Pd(II) Complexes." Doctoral thesis, Urbino, 2015. http://hdl.handle.net/11576/2628805.
Повний текст джерелаBassard, David. "Méthodologie de prédiction et d’optimisation du potentiel méthane de mélanges complexes en co-digestion." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2175/document.
Повний текст джерелаThe co-digestion of agro-industrial substrates in anaerobic conditions falls within the objectives of an optimized management of agricultural resources along with reduction of anthropogenic impacts and development of renewable energies. Considering scientific and industrial bottlenecks from literature review, it could be identified that a methodological approach was the key to an enhanced understanding of anaerobic co-digestion. Ultimately, formulation of the substrate and co-substrates (digestor’s inputs) appeared to be the main actuator to optimize anaerobic co-digestion. Conciliating both scientific and industrial issues, this thesis led to the following findings : (i) an implementation of simple and cost-saving methods to characterize the inputs of digestor and biogas production, (ii) a determination of fundamental relationship between substrate blend and his biomethane potential, (iii) a development of predictive tools for biomethane potential of substrate blends as well as global and specific biodegradability of substrates, (iv) an enhanced comprehension of first, interactions between codigested substrates and the microbial consortium and second, the adaptation capacity of the microbial consortium to various organic loading (homeostatic capacity)