Dissertations / Theses on the topic 'TGA'
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Ruloff, Karl. "Formgebung angiopolarer Zellträger nach dem TGA-Verfahren /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13893.
Full textHoffman, Roland. "Measuring ΔH Using DSC, TGA & DTA." TopSCHOLAR®, 1990. https://digitalcommons.wku.edu/theses/2500.
Full textJerjini, Mehdi. "Etude des propriétés magnétiques des composés TGa avec T." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606248c.
Full textKuthadi, Sandeep Kumar. "Laboratory Scale Study of Calcium Sulfate Hydration Forms." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1467.
Full textŠilhánková, Lenka. "Vývoj metody pro semikvantitativní stanovení mikroplastů v půdách metodou TGA-MS." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376860.
Full textMartin, Brandon Ray. "Pyrolysis and ignition behavior of coal, cattle biomass, and coal/cattle biomass blends." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1148.
Full textRitzka, Yvonne. "Untersuchungen zum Abbrandverhalten von Holz- und Spanplattenproben mit einer TGA-FTIR-Kopplung." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=955274982.
Full textGundogar, Sati Asli. "Thermal Characterization And Kinetics Of Crude Oils By Tga And Dsc Methods." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611502/index.pdf.
Full textC/min) and air is used for combustion and nitrogen for pyrolysis experiments. In combustion experiments, TGA and DSC techniques indicate that the combustion process of crude oils studied is composed of two main reaction regions. These are low-temperature (LTO) and high-temperature oxidation (HTO) regions. In LTO, huge mass loss occurs (from 69 to 87 %) due to high amount of free moisture and volatile hydrocarbons contained in oil samples. Combustion reactions continue up to 900 K. On DSC curves, two exothermic regions of oxidation regimes are detected. Comparing TG/DTG and DSC curves, it can be understood that the mass loss under combustion is accompanied by exothermic peaks because of the oxidative degradation of crude oil components. As in combustion, two distinct reaction regions are revealed under pyrolysis for all samples. The first region indicates distillation and the second one is due to thermal cracking reactions occur at high temperatures and completed up to 840 K. As expected, lighter crude oils have relatively higher amounts of mass loss in distillation region as compared to heavier ones. Besides, residue amount and burn-out temperatures are higher for heavier oils with higher asphaltene content in cracking region. DSC curves for both reactions show endothermic effects. In combustion and pyrolysis experiments, it is noticed that higher heating rates are resulted in higher reaction regions. Distinguishing peaks of samples shift to higher temperatures with an increase in heating rate. Heat of reaction amount under DSC curves is related to asphaltene content and &
#730
API gravity of crude oils. It is deduced that, when &
#730
API gravity of crude oils decreases, the heat value of this reaction increases. The kinetic parameters are evaluated by different kinetic models and mean activation energies (Em) of samples are obtained. At the end, a correlation is established between Em and &
#730
API gravity of oil samples. It is concluded that heavier oils have higher activation energy and Arrhenius constant values for each reaction region. Besides, it is proved that the activation energy is mostly insensitive to the heating rate.
Corrales, Sanchez Tachmajal Marie. "TGA-MS studies of the pyrolysis of corn stover for charcoal production." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105030.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 61-64).
More than two billion people worldwide rely on wood-based fuels for their daily energy needs, which can produce toxic atmospheric contaminants and cause environmental degradation. MIT D-Lab addresses this challenge with "Fuel from the Fields", a simple technique for making charcoal from agricultural waste. In this work, Themogravimetric analysis combined with online mass spectrometry (TGA-MS) was used to study the pyrolysis of corn agricultural waste with the aim of improving understanding of the carbonization process. Non-isothermal mass loss data from TGA was obtained for three types of corn waste, cobs, husks, and stalks; and used to calculate proximate analysis in terms of moisture, volatile matter, and charcoal content. TGA-MS data for the three materials was used to understand the emissions of H20, CO, H2S and C4H2 as a function of temperature. Activation energy, Ea, and pre-exponential factor, A, were calculated using the first order global single reaction model for corn cobs and husks. TG-DTG data suggested that corn cobs are better suited feedstocks for charcoal production. Mass Spectroscopy was found to successfully characterize emissions. For corn cobs, A = 1.3. 105 s-1 and E, = 88.6 kJ/mol, while for husks A = 5.2. 105 s-1 and Ea = 96.4 kJ/mol. Based on this work, a carbonization burn timeline worksheet was created to aid monitoring of char yield in the field.
by Tachmajal Marie Corrales Sanchez.
S.B.
Retief, Liezel. "Analysis of vegetable oils, seeds and beans by TGA and NMR spectroscopy." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6831.
Full textENGLISH ABSTRACT: Due to the commercial, nutritional and health value of vegetable oils, seeds and beans, the analysis of their components is of much interest. In this dissertation oil-containing food products, specifically vegetable oils, seeds and beans, were investigated. Selected minor components of three locally produced vegetable oils, namely apricot kernel, avocado pear and macadamia nut oils were investigated using 31P NMR spectroscopy. These minor components, including 1,2 diacylglycerols, 1,3 diacylglycerols and free fatty acids, were identified in the 31P NMR spectra of each of the three vegetable oils for the first time. Two approaches were used for the quantification of the minor components present in the spectra. A calibration curve approach used known concentrations of standard minor components to establish calibration curves while a direct correlation approach calculated the unknown concentration of minor components in the vegetable oils using a known amount of standard compound within the analysis solution. These approaches aided in determining the concentration of minor components during storage studies in which vegetable oils were stored in five different ways: exposed to light, in a cupboard, in a cupboard wrapped in tin foil, at -8 °C and at 5 °C. It was found that determining the best storage condition for each oil was difficult since individual minor components were affected differently by the various storage conditions. However, in general the best storage conditions appeared to be 5 °C and -8 °C. The oil, protein and carbohydrate contents of sesame, sunflower, poppy, and pumpkin seeds, and soy, mung, black and kidney beans were analysed by thermogravimetric analysis and 13C NMR solid state NMR spectroscopy. It was shown that the first derivative of TGA data for seeds and beans can give valuable information about the carbohydrate, moisture, protein and fat content. This has not been previously demonstrated. For the seeds, the integration of a region between 270–480 ºC was equal to the sum of the oil and protein content and compared well to quantitative results obtained by other conventional methods. For beans the integration of a region between 180-590 ºC, gave a value which represented the sum of the oil, protein and carbohydrate content. 13C solid state NMR spectroscopy, including SPE-MAS, CP-MAS and variable contact time experiments, was carried out on these seeds and beans and gave valuable information on the solid-like and liquid-like components. To our knowledge these seeds and beans have never been previously analysed using this technique. 13C SPE-MAS NMR spectroscopy indicated that the seeds contained more liquid-like components than the beans. In turn the 13C CP-MAS NMR spectra indicated that beans had higher levels of solid-like components than the seeds. These conclusions correlated well with the quantities of liquid-like components and solid-like components that were determined by conventional methods and TGA. Preliminary studies using T1pH experiments on the components present in the seeds and beans led to a few observations. Most interesting is that a model using a two- phase fit in order to determine T1pH values appears to be more accurate than a one-phase model.
AFRIKAANSE OPSOMMING: Groente olies, sade en bone is ‘n onderwerp van groot belang omrede hul kommersiële, voeding en gesondheidswaardes. In hierdie tesis is olie-bevattende voedselprodukte, spesifiek groente-olies, sade en bone geanaliseer. Geselekteerde komponente teenwoordig in klein hoeveelhede in drie lokaal geproduseerde groente-olies, naamlik appelkoos-pit, avokadopeer en makadamia-neut olies is geanaliseer met behulp van 31P KMR spektroskopie. Hierdie komponente, insluitend 1,2 diasielglyserole, 1,3 diasielglyserole en ongebonde vetsure, is vir die eerste keer geïdentifiseer in die 31P KMR spektra van die drie groente olies. Twee benaderings is gebruik vir die hoeveelheids-bepaling van die komponente in die spektra. ‘n Yking-kurwe metode het gebruik gemaak van bekende hoeveelhede konsentrasies standaard komponente vir die opstel van yking-kurwes, terwyl ‘n direkte korrelasie metode gebruik is om die onbekende konsentrasie van komponente in groente olies te bepaal met behulp van ‘n bekende hoeveelheid standaard verbinding teenwoordig in die oplossing. Hierdie metodes het gelei tot die bepaling van die konsentrasies van die komponente gedurende vyf verskillende berging toestande wat ingesluit het: Blootgestel aan lig, in ‘n donker kas, in ‘n donker kas toegevou in tin foelie, bevries by -8 °C en in ’n koelkas by 5 °C. Dit was bevind dat bepaling van die beste bergingstoestand vir elke olie moeilik is aangesien die individuele komponente verskillend geaffekteer word deur die verskeie berging toestande. Die beste bergings toestand oor die algemeen blyk egter om by 5 °C en -8 °C te wees. Sesamsaad, sonneblomsaad, papawersaad en pampoensaad sowel as sojaboontjie, mungboontjie, swartboontjie en pronkboontjie se olie, protein en koolhidraat komponente was geanaliseer met behulp van termogravimetriese analise (TGA) en 13C soliede toestand KMR spektroskopie. Dit was bevind dat die eerste afgeleide van die TGA data waardevolle inligting lewer oor die komponent inhoud van elk van die sade en bone. Hierdie is nog nie vantevore bevind nie. Vir die sade, was die integrasie van ‘n area tussen 270–480 ºC gelyk aan die som van die olie en proteïen inhoud en het goed vergelyk met die waardes verky deur algemene analitiese metodes. Vir die boontjies, was die integrasie van ‘n area tussen 180-590 ºC gelyk aan die som van die olie, protein en koolhidraat inhoud. 13C vaste staat KMR spektroskopie, insluitende SPE-MAS, CP-MAS en variëerbare kontak-tyd eksperimente, was gedoen en het waardevolle inligting gelewer omtrent die solied-agtige en mobiel-agtige komponente. Hierdie sade en bone is tot ons kennis nog nie van te vore met die tegnieke ondersoek nie. 13C SPE-MAS NMR spektroskopie het aangedui dat daar ‘n groter hoeveelheid mobiel-agtige komponente in sade as in bone teenwoordig is. 13C CP-MAS NMR spektroskopie het weer aangedui dat daar ‘n groter hoeveelheid solied-agtige komponente in bone as in sade teenwoordig is. Hierdie gevolgtrekkings het goed vergelyk met die waarnemings verkry deur konvensionele analitiese metodes en TGA. Voorlopige studies op die komponente van sade en bone deur T1pH eksperimente het tot ‘n paar gevolgtrekkings gelei waarvan die mees interessantste was dat ‘n twee-fase model vir die bepaling van T1pH waardes beter resultate lewer as ‘n een-fase model.
Tejan-Kella, Alphan. "Pharmacists' knowledge and attitudes towards paediatric cough and cold management post TGA recommendations." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/11483.
Full textOberg, Suárez Héctor Francisco. "Resistencia a la Oxidación/Corrosión del Cobre Recubierto con Compuestos de Titanio Mediante Doble Plasma." Tesis, Universidad de Chile, 2008. http://www.repositorio.uchile.cl/handle/2250/103023.
Full textAtem-Tambe, Ntoh. "Characterization of Fluoropolymer Powders Made By Supercritical Assisted Mixing With Crystalline Additives." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1365.
Full textBergeault, Karine. "Identification de deux gènes NPR1chez les VITACEAE, analyse de leur diversité de séquences et interactions avec les facteurs de transcription VvTGA." Phd thesis, Université de Haute Alsace - Mulhouse, 2010. http://tel.archives-ouvertes.fr/tel-00769928.
Full textLe, Tan. "Kemin bakom framtidens avgasrening : En studie av ureasönderfall under kvävgasatmosfär." Thesis, Uppsala universitet, Institutionen för materialkemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155896.
Full textAhmad, Yousef. "Oxidation of Graphite and Metallurgical Coke : A Numerical Study with an Experimental Approach." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193604.
Full textEngel, Konstanze [Verfasser]. "Langzeit Follow-Up nach Mustard- und Senning-Operation bei Patienten mit d-TGA / Konstanze Engel." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2020. http://d-nb.info/1206182644/34.
Full textTita, Bertrand Asongwe. "Waste-to-Energy : A study on Reaction Kinetics of Tropical Wood Sawdust." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-9746.
Full textNorman, Rachel L. "Incorporation of nickel into synthetic goethites and the stabilisation of mineral precursor phases : implications for natural systems." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16209.
Full textSuthagar, J., and Kissinger J. K. Suthan. "Synthesis and Characterization of ZnSe1-xTex Alloy Thin Films Deposited by Electron Beam Technique." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35012.
Full textLucius, Ruth A. "Assessing Corn Quality And Transformation During Nixtamalization: A Physico-Chemical Approach." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1231442056.
Full textGul, Kiymet Gizem. "Thermal Characterization And Kinetic Analyis Of Sara Fractions Of Crude Oils By Tga And Dsc Methods." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613614/index.pdf.
Full textC/min) under air atmosphere. Same gas flow rate and same pressure were applied to all samples. The aim is to determine the kinetic analysis and combustion behavior of crude oils and their fractions and also determining the effect of heating rate on all samples. For all samples two main reaction regions were observed in thermogravimetry (TG), differential thermogravimetry (DTG) and DSC curves due to the oxidative degradation of crude oil components. It was deduced that the free moisture, volatile hydrocarbons were evaporated from the crude oils, light hydrocarbons were burned and fuel was formed in the first reaction region. The second reaction region was the main combustion region where the fuel was burned. From the TGA curves, it was detected that the heavier fraction, resins, lost considerable amounts of their initial mass, approximately 35%, while saturates lost only approximately 3% of their initial mass in the second reaction region. DSC curves of the samples were also examined and observed that as the sample got heavier, the heat of the reaction increased. Saturates, lightest part of the crude oil fractions, gave minimum heat of reaction. As the heating rate increased, shift of peak temperatures to high values and higher reaction regions were observed. The kinetic analysis of crude oils and their fractions were also performed using different kinetic methods. Activation energies (E), mean activation energies (Emean) and Arrhenius constants were found for crude oils and fractions. It was deduced that the resins gave the highest activation energy and Arrhenius constant for both reaction regions. Moreover, it was encountered that heating rate has no effect on activation energies.
Mazzon, Elena. "Développement, étude physico-chimique et optimisation de mousses polymères biosourcées." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT197.
Full textThis thesis focuses on the development of a new generation of bio-based polymer foams able to produce low density core in sandwich structure for automotive applications. The polymer formulations used in this research contain two different epoxy compounds, epoxidized linseed oil (ELO) and the epoxidized glycerol (GE). Combined in varying proportions, they were cured with two different hardeners, isophorone diamine (IPDA) or methyl tetrahydrophthalic anhydride (MTHPA). Ternary formulations “ELO – GE – hardener” were characterized by a multi-techniques approach (DSC, TGA, rheometry in steady or dynamic mode) in order to establish structure-property relationships. The production of polymeric-foam materials was carried out by tuning a chemical reaction which takes place during curing. Sodium bicarbonate and potassium bicarbonate were used as harmless foaming agents. In order to improve the final performances of the foams, the ratio GE/ELO was increased in the reactive formulations based on IPDA hardener. But, such modification provokes also the thermal degradation of the system because of the high exothermicity of the curing reaction. The introduction of “exothermicity regulators” that undergo endothermic transformations allowed to control the excess of released heat and consequently, to prevent the material degradation. A last class of hardener was also studied and made it possible after optimization the production of foams with good ultimate properties. To conclude, a large range of biobased and lightweight rigid foams able to be produced in a few minutes was developed
Pettersson, Henrik. "Chemical analysis for mapping of soot reactivity." Thesis, KTH, Skolan för kemivetenskap (CHE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153489.
Full textFör att kunna förbättra regenereringen av dieselpartikelfilter krävs en ökad kunskap om dieselsot och dess reaktivitet. I detta examensarbete jämförs sot som skapas vid accelererad sotinlagring genom sänkt railtryck, med sot från normal sotinlagring. Hur sotets egenskaper påverkar dess reaktivitet undersöks också genom termogravimetrisk analys, svepelektronmikroskopi, energidispersiv röntgenspektroskopi, BET-kväveadsorption och FTIR-spektroskopi. Hur väl dessa analysmetoder lämpar sig för analys av sot utvärderades också. Sotproverna utgjordes av två så kallade ”carbon black” för referens (Printex U och Vulcan XC 72), fyra accelererade sotprov och två icke-accelererade prov. Resultaten visade att de accelererade proverna innehöll mindre flyktiga organiska föreningar än icke-accelererade sot och krävde något högre temperaturer för att oxideras i luft. Sot med ett högt syre/kol-förhållande och höga nivåer av flyktiga organiska föreningar visade sig vara mest reaktivt. Den mest användbara metoden för att analysera sot var den termogravimetriska analysen. Svepelektronmikroskopi och energidispersiv röntgenspektroskopi var användbara som komplementerande metoder men FTIR-spektroskopi gav väldigt lite användbar information. Ingen konkret slutsats drogs gällande nyttan av BET-kväveadsorption.
Elkhatib, Wassef. "Ignifugation de polyuréthanes par des phosphonates réactifs." INSA de Rouen, 2002. http://www.theses.fr/2002ISAM0012.
Full textIt is well known that polyurethanes based on hydroxyl terminated polybutadiene (HTPB) and (methylene diisocyanate) MDI have a weak fire resistance. Our target is to improve fire resistance of these polyurethanes by addition of a phosphorus compound as chain extender. Three types of diol phosphonates were synthetized. Different kinetic models were proposed concerning thiolene reaction in agreement with our experimental results. We used these diol phosphonates as chain extenders to obtain elastomer polyurethanes (PUs) with various phosphorus contents. The mechanical properties using DMA showed two relaxation transitions assumed as Tgs. The Tg of HTPB soft segments (SS) is unchanged although the Tg of the hard segments (HS) increases by increasing the phosphorous amount. The Tg of the samples containing 1. 5 % of phosphorus preserves the flexibility of the materials. The thermal degradation of PUs by TGA was examined. It showed a fire resistance improvement of phosphorus-containing PU e. .
Chai, Ming. "Thermal Decomposition of Methyl Esters in Biodiesel Fuel: Kinetics, Mechanisms and Products." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342544227.
Full textHillier, James L. "Pyrolysis Kinetics and Chemical Structure Considerations of a Green River Oil Shale and Its Derivatives." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2606.
Full textFonseca, Jose Pedro. "Vias de sinalização de estresses em plantas = análise da região promotora do gene NIMIN-1 de Arabidopsis thaliana e da proteína ScCBL1 de cana-de-açúcar (Saccharum spp.)." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317450.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: Estresses bióticos e abióticos como a seca, salinidade e ataque por patógenos são responsáveis por perdas significantes em culturas de grãos ao redor do mundo. Diversos genes são regulados em resposta a esses fatores e podem ser ativados ou reprimidos para gerar uma resposta específica na planta de maneira a gerar uma resposta de defesa que atenue os efeitos do estresse e promoção de tolerância pela planta. É importante entendermos o funcionamento desses mecanismos moleculares, e dos genes e proteínas envolvidas nestas vias de sinalização para um melhor conhecimento de como estas vias de transdução operam em plantas, bem como no desenvolvimento de variedades de plantas tolerantes. No capítulo I deste trabalho nós descrevemos a análise funcional de um motivo de ligação do fator TGA localizado na região promotora do gene NIMIN-1 que é altamente induzido por ácido salicílico (SA) durante defesa de plantas (estresse biótico). Fatores TGA desempenham um papel chave na defesa de plantas através da interação com elementos presentes na região promotora de genes de defesa para induzir a sua expressão. O ácido salicílico (SA) é um fito-hormônio que induz a expressão do gene que codifica a proteína NIMIN-1. Essa proteína interage com a proteína NPR1/NIM1, reguladora da resistência sistêmica adquirida (SAR). Neste trabalho foi investigado se um motivo de ligação do fator TGA2 "TGACG", localizado na região promotora imediatamente anterior ao sítio de iniciação da transcrição de NIMIN-1, é necessário a indução de NIMIN-1 por ácido salicílico. Uma versão mutagenizada do promotor do gene NIMIN-1 foi gerada por mutação sítio-dirigida. Nós geramos construções T-DNA nas quais tanto a região promotora nativa quanto a mutagenizada foram fusionadas aos repórteres proteína verde fluorescente (GFP) e beta-glucuronidase (GUS). Foram geradas plantas transgênicas e a expressão de GFP sob o controle da região promotora de NIMIN-1 foi observada em raízes, no pecíolo e folhas de Arabidopsis. A atividade dirigida pelo promotor mutagenizado e o selvagem foi quantificada por PCR quantitativo em tempo real. Tanto a construção contendo o promotor de NIMIN-1 como a cópia endógena de NIMIN-1 foram induzidas por SA. Em contraste, a construção promotora mutagenizada foi bem menos sensível a SA que o promotor nativo de NIMIN-1. Esse dado indica que o motivo de ligação do fator TGA2 analisado está diretamente envolvido na modulação da expressão de NIMIN-1 induzida por SA em Arabidopsis. No capítulo II nós descrevemos a caracterização da proteína ScCBL1 de cana-de-çúcar que apresenta elevada identidade com membros da família de proteínas sensoras de cálcio do tipo calcineurina B (CBL) em plantas. Experimentos de duplo-híbrido realizados em nosso grupo mostram que a proteína ScCBL1 interage com uma proteína quinase (ScCIPK8). Trabalhos prévios também desenvolvidos em nosso laboratório demonstraram que ScCIPK8 está envolvida no metabolismo do carboidrato e é diferencialmente expressa em resposta a ABA. O gene ScCBL1 foi clonado e a proteína codificada expressa e purificada a partir do extrato solúvel por cromatografia de afinidade usando resina Ni-NTA e a proteína eluída foi usada para estudos estruturais. Análises por espectrometria por dicroísmo circular (CD) mostraram que a proteína ScCBL1 é composta predominantemente por ?-hélices, em concordância com programas de predição da sequência de aminoácido desta proteína. Experimentos de espalhamento de raio-x a baixos ângulos (SAXS) indicaram que as amostras obtidas da ScCBL1 estavam homogêneas e monodispersas em solução e que ocorre uma mudança em seu estado oligomérico quando adicionado o agente redutor DTT, ocorrendo uma diminuição na intensidade de espalhamento (I(0)) a uma ordem de 1,56 para a mesma concentração, acompanhado de uma diminuição de 10 Å em seu raio de giro. As analises por SAXS indicaram que a proteína ScCBL1 é pentamérica em seu estado nativo e um trímero quando adicionado DTT. Análises por SAXS também indicaram que a proteína ScCBL1 está enovelada em solução, apresentando estrutura terciária estável. A modelagem de baixa resolução ab initio, juntamente com a função de distribuição das distâncias P(r) indicaram que a proteína possui um formato alongado (prolato). Ensaios iniciais de cristalização a partir de amostras monodispersas da proteína ScCBL1, confirmadas por DLS, foram feitas e um monocristal simétrico de aproximadamente 0.05 mm de diâmetro obtido além de outros sinais promissores para um refinamento das condições de cristalização de ScCBL1 para determinação de sua estrutura tridimensional a uma alta resolução. Esses dados contribuem para uma caracterização inicial da estrutura da proteína ScCBL1
Abstract: Many biotic and abiotic stresses such as drought, salinity and pathogen attack are responsible for major crop losses around the world. Several genes are regulated in response to these factors to counteract the stress effects and promote plant tolerance. Understanding the molecular mechanisms as well as the roles of genes and proteins involved in stress signaling pathways is key to a better understanding of plant tolerance. We report in chapter I the functional analysis of a TGA biding factor located in the promoter region of NIMIN-1 that is highly induced by SA during plant defense against pathogen attack (biotic stress). TGA factors play a key role in plant defense by binding to the promoter region of defense genes, inducing their expression. Salicylic acid (SA) induces the expression of the gene encoding NIMIN-1, which interacts with NPR1/NIM1, a key regulator of systemic acquired resistance. In this work we investigated whether the TGA2-binding motif TGACG located upstream of the NIMIN-1 gene is necessary for SA induction of NIMIN-1 expression. A mutated version of the NIMIN-1 promoter was created by site-directed mutagenesis. We generated T-DNA constructs in which native NIMIN-1 and mutated promoters were fused to green fluorescent protein and ?-glucuronidase reporters. We produced transgenic Arabidopsis plants and observed NIMIN-1 promoter-driven green fluorescent protein expression in the roots, petiole and leaves. Constructs were also agroinfiltrated into the leaves to evaluate gene expression of mutagenized and native promoters driving expression of GUS using quantitative real-time RT-PCR. We characterized the normal gene response to SA and compared it to the response of the mutant version of the NIMIN-1 promoter. Both the native NIMIN-1 construct and an endogenous copy of NIMIN-1 were induced by SA. However, the mutated promoter construct was much less sensitive to SA than the native NIMIN-1 promoter, indicating that this TGA2-binding motif is directly involved in the modulation of SA-induced NIMIN-1 expression in Arabidopsis. In chapter II we describe the characterization of a sugarcane ScCBL1 protein which displays high sequence identity to the calcium binding protein family calcineurin B-like (CBL) from plants. Using the two-hybrid system our group has shown that ScCBL1 binds to a protein kinase (ScCIPK8). Previous work done in our laboratory also showed that ScCIPK8 is involved in carbohydrate metabolism and that it is differentially expressed in response to ABA. ScCBL1 was cloned, expressed and purified by one round of affinity chromatography using a Ni-NTA resin and the purified eluted protein was used for structural analysis. Spectroscopic analysis by circular dichroism (CD) showed that ScCBL1 is mainly composed of ?-helices agreeing with secondary structure prediction by PredictProtein server. Small Angle X-Ray Scattering (SAXS) analysis showed that ScCBL1 sample is homogeneous and monodisperse in solution and that the protein undergoes an oligomeric change when DTT is added, with a decrease in scattering intensity (I(0)) by a factor of 1,56 for samples with the same concentration, together with a decrease in the radius of gyration of 10 Å. SAXS experiments also showed that ScCBL1 is pentameric in its native state and the protein undergoes a change in its oligomeric state to a trimer when DTT is added. SAXS experiments also showed the protein is folded in solution and ab initio modeling of ScCBL1 protein envelope together with the pair-distribution function P(r) indicates that the protein has a rod-like, elongated shape. An initial crystallization screening with ScCBL1 monodisperse samples (confirmed by DLS experiments) was carried out and some crystallization signals were obtained, including a single crystal of around 0.05 mm in length. These data shed light on the structural features of ScCBL1
Doutorado
Genetica Vegetal e Melhoramento
Doutor em Genetica e Biologia Molecular
Budimir, Jelena [Verfasser]. "Regulation of clade I TGA transcription factors of Arabidopsis thaliana during salicylic acid-mediated defense response / Jelena Budimir." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1215338635/34.
Full textAndrade, NÃdia Ferreira de. "O efeitos da temperatura sobre a oxidaÃÃo de nanotubos de carbono." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5424.
Full textOs nanotubos de carbono apresentam extraordinÃrias propriedades fÃsico-quÃmicas que tÃm sido exploradas para aplicaÃÃes que vÃo desde a ciÃncia de materiais atà a biologia. No entanto, a maioria das aplicaÃÃes requer modificaÃÃes quÃmicas dos nanotubos de modo a explorar ao mÃximo seu potencial. Neste contexto, o desenvolvimento de protocolos de tratamento e de purificaÃÃo à muito importante. O objetivo deste estudo à contribuir para o entendimento de como a mudanÃa de uma variÃvel especÃfica, a temperatura, afeta as propriedades fÃsico-quÃmicas dos nanotubos de carbono de paredes mÃltiplas (MWNTs) durante a purificaÃÃo. Um grama (1g) de MWNTs (Ctube 100, CNT Co. Ltd., Incheon - CorÃia do Sul) foram submetidos a um refluxo de Ãcido nÃtrico 9 mol/L por 12 horas em temperaturas de 25ÂC, 75ÂC, 125ÂC e 175ÂC. ApÃs o refluxo, as amostras foram resfriadas em um banho tÃrmico, filtradas em condiÃÃes de vÃcuo com uma membrana de PTFE de 0, 2 Âm e lavadas com Ãgua deionizada atà que o pH neutro do filtrado foi atingido. Por Ãltimo, os MWNTs oxidados foram secos em vÃcuo durante 48 h. As tÃcnicas utilizadas neste trabalho para a realizaÃÃo das caracterizaÃÃes forneceram resultados que tratam desde caracterÃsticas macro e de superfÃcie atà as associadas ao nÃvel atÃmico. A estabilidade tÃrmica foi analisada por meio de medidas de TGA, uma vez que muitos dos grupos funcionais criados no tratamento sÃo termicamente instÃveis. A oxidaÃÃo resultante do tratamento introduz grupos polares na superfÃcie dos MWNTs e assim cria a estabilidade eletrostÃtica necessÃria para uma dispersÃo estÃvel em meio aquoso. A estabilidade foi avaliada para cada amostra por meio de medidas de potencial zeta. A quantidade e o tipo de resÃduos catalÃticos presentes nas amostras antes e depois do tratamento foram analisados atravÃs de medidas de EDX e UV-VIS. Medidas de espectroscopia Raman Confocal permitiram a anÃlise especÃfica dos defeitos estruturais criados sobre a superfÃcie dos tubos, em conseqÃÃncia do processo de oxidaÃÃo. Constatou-se que os experimentos Raman devem ser realizados sobre muitos pontos para poder acessar as propriedades mÃdias das amostras. A capacidade de adsorÃÃo da superfÃcie de cada amostra apÃs o tratamento foi inspecionada atravÃs de medidas de Ãrea superficial especÃfica (mÃtodo BET). Ao comparar os resultados de diferentes tÃcnicas, foi possÃvel acessar os efeitos da temperatura do tratamento sobre as propriedades fÃsico-quÃmicas relevantes, permitindo assim a obtenÃÃo de amostras bem caracterizadas que serÃo Ãteis para futuros estudos em Ãreas bio-relacionadas.
Carbon nanotubes exhibit remarkable physico-chemical properties which have been exploited for applications ranging from materials science to biology. However, most of the aplications requires the chemical modification of the nanotubes in order to exploit their maximum potential. In this context, the development of protocols for treatment and purification is very important. The purpose of this study is to contribute for the understand on how the change of a particular purification parameter, temperature, affects the physico-chemical properties of multi-walled carbon nanotubes (MWNTs) during the purification. One gram (1g) of MWNTs (Ctube 100, CNT Co. Ltd., Incheon - South Korea) were subjected to a reflux with nitric acid 9 mol/L for 12 hours at temperatures 25ÂC, 75ÂC, 125ÂC and 175ÂC. After refluxed, the samples were cooled down in a heat bath, filtered in vacuum condition using a PTFE membrane of 0, 2 Âm and washed with deionized water until the neutral pH of the filtrate was reached. Afterwards, the oxidized MWCNTs were dried in vacuum for 48 h. The experimental techniques used in this work to perform the samples characterization provide results that allow to get information from macro and surface characteristics to those associated with the atomic level. Thermal stability was analyzed by TGA measurements, since many of the functional groups created during the treatment are thermally unstable. Oxidation resulting from treatment introduces polar groups on the surface of MWNTs thus creating the electrostatic stability required for a stable dispersion in aqueous medium. The stability was evaluated for each sample by zeta potential measurements. The amount and type of catalytic residues present in the samples before and after treatment were analyzed by means of EDX and UV-VIS. Techniques confocal Raman spectroscopy measurements allowed the specific analysis of the structural defects created on the surface of the tubes as a consequence of oxidation process. It was found that Raman experiments should be performed on may points of the sample in order to access their average properties. The adsorption capacity of the surface of each sample after treatment, were inspected through specific surface area measurements (BET method). By comparing the results of different techniques it was possible to access the effects of temperature on the treatment on the relevant physico-chemical properties thus allowing us to have well characterized samples that will be useful for further studies in biorelated areas.
Wells, Tyrone. "Lignin for bioenergy & biomaterials." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53575.
Full textShulga, Yu M., A. Michtchenko, S. A. Baskakov, V. V. Abalyaeva, O. N. Efimov, N. Y. Shulga, J. G. Cabanas-Moreno, L. Lartundo-Rojas, and L. A. Moreno-Rojas. "Composite Material for Supercapacitors Formed by Polymerization of Aniline in the Presence of Graphene Oxide Nanosheets." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35236.
Full textUribe, Ramirez Ana M. "Concrete carbonation as a sink for carbon dioxide: results for simulated field curing conditions." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282574502.
Full textCristallini, Pietro Paolo. "Atom transfer radical polymerization di monomeri polari: studio delle condizioni utili per uno scale-up industriale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13377/.
Full textYang, Yang. "Investigation of vanadium-containing oxide systems : CALPHAD and experiments." Doctoral thesis, KTH, Termodynamisk modellering, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197292.
Full textQC 20161202
Paliwal, Vaishali. "Study of lead sorption on magnetite at high temperatures." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5445/.
Full textSasivongpakdi, Adison. "Beneficial Use of Wastes: Petroleum-Contaminated Sediment and Coal Refuse." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282055856.
Full textPlunkett, Richard. "Assessment of residual composite properties as influenced by thermal mechanical aging." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11072008-063142/.
Full textVhathvarothai, Navirin. "Thermochemical Behaviour and Syngas Production from Co-gasification of Biomass and Coal Blends." Thesis, Griffith University, 2013. http://hdl.handle.net/10072/367479.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text
Ndlovu, Bongani. "Kimberlite weathering : effects of organic reagents." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33354.
Full textDissertation (MEng)--University of Pretoria, 2013.
gm2014
Materials Science and Metallurgical Engineering
UPonly
Танчик, Дмитро Юрійович, and Dmytro Yuriiovych Tanchyk. "Проект дільниці ремонтного цеху для технічного обслуговування вантажних автомобілів MAN TGA 33.480 з дослідженням залежності ступеня зношеності шийок колінчастого валу." Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2020. http://elartu.tntu.edu.ua/handle/lib/33508.
Full textВ кваліфікаційній роботі розроблено технологію технічного обслуговування вантажних автомобілів MAN TGA 33.480, а також досліджено залежность ступеня зношеності шийок колінчастого валу.
The qualification work developed the technology of maintenance of trucks MAN TGA 33.480, as well as investigated the dependency of the degree of wear of the cervical cynk shaft.
Вступ... 1 ЗАГАЛЬНО-ТЕХНІЧНИЙ РОЗДІЛ... 1.1 Розрахунок виробничої програми АТП за кількістю видів технічних дій... 1.2 Висновки та постановка завдання на магістерську роботу... 2 ТЕХНОЛОГІЧНИЙ РОЗДІЛ... 2.1 Розробка технологічного процесу технічного обслуговування вантажних автомобілів MAN ТGA... 2.2 Операції технічного обслуговування... 2.3 Розрахунок кількості робочих постів... 2.4 Підбір технологічного обладнання для дільниці ТО... 2.5 Площі виробничих зон і відділень... 3 КОНСТРУКТОРСЬКИЙ РОЗДІЛ... 3.1 Призначення, конструкція та принцип роботи пристосування... 3.2 Розрахунки по пристосуванням... 3.3 Розрахунок річного економічного ефекту від впровадження конструкторських розробок... 4 НАУКОВО-ДОСЛІДНИЙ РОЗДІЛ... 4.1 Дослідження зв’язку діагностичних і структурних параметрів... 4.2 Закономірності зношування сполучень деталей силового агрегату автомобілів... 4.3 Композиція прогнозів залишкового ресурсу... 5 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ... 5.1 Обов'язкові роботи, при профілактичному технічному обслуговуванні та ремонті... 5.2 Основні напрямки та шляхи підвищення стійкості функціонування об'єкту в умовах надзвичайних ситуацій... ЗАГАЛЬНІ ВИСНОВКИ... БІБЛІОГРАФІЯ... ДОДАТКИ
Hoffmann, Janine [Verfasser]. "Magnetresonanztomografische Analyse des Herzens von Patienten nach Vorhofumkehroperation zur Korrektur einer kompletten Transposition der großen Gefäße (d-TGA) / Janine Hoffmann." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2011. http://d-nb.info/1025355210/34.
Full textAgioutanti, Eleftheria. "An Improved Thermogravimetric Analysis Method for Respirable Coal Mine Dust and Comparison to Results by SEM-EDX." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/91984.
Full textMaster of Science
It has long been known that chronic exposures to excessive respirable coal mine dust can lead to the development of lung diseases such as Coal Worker’s Pneumoconiosis (“Black Lung”) and silicosis. Disease rates in central Appalachia have shown an alarming and unexpected increase since the mid-1990s, despite declining dust concentrations evident from regulatory compliance monitoring data. Clearly, there is a need to better understand coal mine dust composition, which will require additional analytical methods. Thermogravimetric analysis (TGA) has been proposed as one possible method, because it should allow estimation of three key dust components from separate sources: coal from the coal strata being mined; non-carbonate minerals from the rock strata being mined or drilled; and carbonates from application of rock dust products to the mine floor and ribs. However, preliminary work with TGA showed limited accuracy, mostly due to sampling materials. In this thesis, two studies were performed. The first study aims to establish an improved TGA method using smooth, polycarbonate (PC) filters. The second study demonstrates the method on a large number of mine dust samples, and compares the results to those gained by an alternative method that uses electron microscopy.
Alevanau, Aliaksandr. "Study of the Apparent Kinetics of Biomass Gasification Using High-Temperature Steam." Licentiate thesis, KTH, Energi- och ugnsteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26356.
Full textQC 20101124
Study of ignition and kinetics of biomass/solid waste thermal conversion with high-temperature air/steam
Guan, Xin. "Fabrication of Poly-Lactic Acid (PLA) Composite Films and Their Degradation Properties." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1333779869.
Full textGu, Yu. "A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759.
Full textOyetunde, Temidayo Timothy. "Novel precursors for chalcogenide materials." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/novel-precursors-for-chalcogenide-materials(db26161b-217b-4ee1-9767-d8fb82dc608b).html.
Full textSánchez, Navarro M. Magdalena. "Microencapsulación de sustancias activas para su incorporación en calzado." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/66330.
Full textGonzález, Martínez María. "Woody and agricultural biomass torrefaction : experimental study and modelling of solid conversion and volatile species release based on biomass extracted macromolecular components." Thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/24326/1/gonzalez_martinez.pdf.
Full textTopa, Ece Hatice. "Thermal Characterization And Kinetics Of Diesel, Methanol Route Biodiesel, Canola Oil And Diesel-biodiesel Blends At Different Blending Rates By Tga And Dsc." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612460/index.pdf.
Full textDifferential Scanning Calorimetry (DSC) and Thermogravimetry (TGA/DTG). The main aim of the study is to observe the combustion and pyrolysis behaviour of methanol route biodiesel and diesel blends at different blending rates. Additionally, combustion and pyrolysis behaviour of canola oil, the origin of biodiesel have been analysed to observe the transesterification reaction effect on biodiesel. Therefore, biodiesel, diesel, canola oil and blends of diesel and biodiesel at different percentages are exposed to isothermal heating under nitrogen and air atmosphere with a constant heating rate of 5, 10 and 15