Tesis sobre el tema "Molecules"
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Vichetti, Rafael Mário [UNESP]. "Síntese dos isótopos do monóxido de carbono no meio interestelar". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91889.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
De acordo com os resultados observacionais de condensações de nuvens moleculares escuras, grandes variações na razão 13CO/C18O são observadas quando se comparam os resultados obtidos nas condensações situadas dentro da mesma nuvem, bem como de nuvem para nuvem. O valor médio dessa razão na condensação principal de Ophiuchus é inferior a 5. Por outro lado, o valor encontrado nas condensações que estão situadas ao norte de Oph é maior que 10. Grandes diferenças também são encontradas quando se comparam os resultados observacionais de diferentes nuvens escuras, tais como Ophiuchus e Taurus, onde são observados também um decréscimo da razão C18O/C17O com o aumento da densidade. Os processos químicos e físicos que governam essas variações ainda não estão claros. Nesse sentido, o objetivo da presente proposta é analisar a influência do colapso gravitacional de condensações de nuvens moleculares escuras na síntese das moléculas CO, C17O, C18O, 13CO, 13C17O e 13C18O. Tal análise é feita com base em comparações entre modelos que consideram diferentes condições entre si, tais como, tamanho da cadeia química, velocidade de colapso, densidade inicial e processos de congelamento de espécies químicas na superfície de grãos de poeira. Os resultados obtidos mostram que o tamanho da cadeia química tem influência nas razões 13CO/C18O e C18O/C17O, mas não tanto quanto a densidade inicial e a velocidade do colapso. Além disso, o congelamento das espécies químicas nos grãos é mais significativo nos estágios mais avançados da evolução da condensação. Os modelos de condensações escuras que sofrem colapso gravitacional lento e em queda livre reproduzem satisfatoriamente as razões 13CO/C18O e C18O/C17O observadas, o que permite concluir que o colapso gravitacional pode ter um importante efeito nas referidas razões.
According to the observational results of dark molecular clouds condensations, large variations in the ratio 13CO/C18O are observed when comparing the results obtained in the condensations located within the same cloud and cloud to cloud. The average value of this ratio in the main condensation of Ophiuchus is below 5. On the other hand, the value found in the condensations that are located north of Oph is larger than 10. Large differences are also found when comparing the observational results of different dark clouds such as Ophiuchus and Taurus, in which are also found a decrease of the C18O/C17O ratio with increasing density. The chemical and physical processes that govern these variations are still unclear. In this sense, the objective of this proposal is to analyze the influence of the gravitational collapse of centrally condensed clumps of dense molecular gas in the synthesis of the CO, C17O, C18O, 13CO, 13C17O and 13C18O molecules. This analysis is based on comparisons among models that consider different condition, such as, chemical chain, initial density, speed of collapse and freezing processes of the chemical species on the surface of dust grains. The results show that the size of the chemical chain has influence on the 13CO/C18O and C18O/C17O ratios, but they are not as important as the initial density and the speed of the collapse. Furthermore, the freezing of chemical species on the grains occurs at later times of the collapse. The models of a gravitational free-fall collapsing core and of slowly contracting core with higher initial density are consistent with observations. These results indicate that the gravitational collapse of molecular cores can have an important effect in the 13CO/C18O and C18O/C17O ratios.
Sargant, Robert John. "Molecular dynamics simulations of elongated molecules". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/molecular-dynamics-simulations-of-elongated-molecules(35c31c02-aa1f-4c87-bab9-db81d813974b).html.
Texto completoBarrett, Michael John Sheiko Sergei. "Molecular visualization of individual molecules during flow". Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2942.
Texto completoTitle from electronic title page (viewed Jun. 23, 2010). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.
Baker, Joseph Lee. "Steered Molecular Dynamics Simulations of Biological Molecules". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/205416.
Texto completoWildman, Jack. "Molecular dynamics simulations of conjugated semiconducting molecules". Thesis, Heriot-Watt University, 2017. http://hdl.handle.net/10399/3261.
Texto completoSchmid, Günter Maximilian. "Dynamical symmetry breaking in molecules and molecular aggregates". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/17393.
Texto completoDean, Delphine Marguerite Denise 1978. "Molecular electromechanics : modeling electrostatic forces between GAG molecules". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86649.
Texto completoIncludes bibliographical references (p. 81-83).
by Delphine Marguerite Denise Dean.
M.Eng.and S.B.
Hatter, Nino [Verfasser]. "Fundamental Properties of Molecules on Surfaces : Molecular Switching and Interaction of Magnetic Molecules with Superconductors / Nino Hatter". Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1123572216/34.
Texto completoGatchell, Michael. "Molecular Hole Punching : Impulse Driven Reactions in Molecules and Molecular Clusters". Doctoral thesis, Stockholms universitet, Fysikum, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-129523.
Texto completoAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 1: Submitted.
Taylor, Jason Matthew 1977. "Controlling molecules with lasers and lasers with molecules". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38638.
Texto completoIncludes bibliographical references (leaves 140-146).
I investigate quantum control of spin in molecules using shaped ultrafast lasers and the dynamics of those lasers when their cavities are modified to include programmable molecular masks. The ability to control quantum phenomena has had several large successes over the last decade. This field, known as Quantum Control, uses closed loop learning algorithms to shape ultrashort laser pulses in order to produce a desired state or state change. Interesting pulse shapes have been able to break chemical bonds, drive chemical reactions, selectively excite molecular states, and most recently, control photoisomerization in proteins [1, 2, 3]. In this thesis I began by seeking to apply this technique to manipulate spin. In our early work we pursued polarizing electron spins and nuclear spins for NMR Quantum Computation. We studied the electron spin triplet state properties of several molecules. Through this work we recognized that the laser and pulse shaper we were using could be modified to utilize the triplet properties of our molecules. We created a molecular triplet state spatial light modulator (SLM) to be used both outside and inside the laser cavity for ultrafast pulse shaping. The SLM consists of a liquid or thin film sample with a strong triplet state absorption.
(cont.) The molecule is selected to be transparent to the target light before pumping and strongly absorptive when pumped into the triplet state. The sample is exposed to laser light reflected off of a DMD chip to produce a 2D pattern to spatially populate the triplet ground state. This is, to our knowledge, the first triplet state ultrafast pulse shaper and the first all-optical inter-cavity spatial frequency modulator.
by Jason Matthew Taylor.
Ph.D.
Lindqvist, Lisa Margareta. "The molecular dissection of protein synthesis via small molecules". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=96682.
Texto completoLa synthèse protéique ou traduction est un processus hautement régulé et essentiel à la vie. Si le rythme de synthèse protéique est trop lent, les protéines ne sont pas remplacées assez rapidement créant un débalancement du taux de renouvellement protéique ce qui entraîne la mort cellulaire. À l'opposé, si le rythme de synthèse est trop rapide, ceci peut engendrer une croissance cellulaire anarchique et potentiellement initier la tumorigenèse. La communauté scientifique cherche à exploiter ce concept afin de créer de nouvelles thérapies anticancéreuses utilisant des inhibiteurs de la traduction. Ces inhibiteurs sont également des outils inestimables pour disséquer les mécanismes de la traduction.L'hippuristanol est un inhibiteur de la traduction qui bloque l'interaction entre eIF4A er l'ARN. Ici, j'ai caractérisé le site de liaison de l'hippuristanol sur eIF4A et j'ai développé des mutants résistant à l'hippuristanol qui ont servis à démontrer que la fonction d'hélicase et l'interaction eIF4G:eIF4A sont toutes deux requises pour que eIF4A soit fonctionnel dans la traduction. De plus, j'ai utilisé ce composé pour déterminer que eIF4B, eIF4H et eIF3a sont tous liés à l'ARN par chimio-pontage et ces interactions qui peuvent être détectées jusqu'à 52 nucléotides en aval de la coiffe requièrent eIF4A. Nous avons également démontré que l'association de eIF4E à l'ARNm n'est détectée par chimio-pontage qu'avec les quelques nucléotides immédiatement en aval de la coiffe et n'est pas détectable au niveau du douzième nucléotide. Ces résultats ont éclaircis le positionnement des facteurs d'initiation au niveau du 5'NTR.Ici, je démontre également que la cytotriénine A, un inducteur d'apoptose dans les cellules leucémiques, est un nouvel inhibiteur de l'élongation lors de a traduction. Ce composé inhibe le fonctionnement du facteur eEF1A et inhibe l'étape de translocation dépendante de eEF1A qui ensuit le chargement du complexe aminoacyl-tRNA sur le ribosome. Le cytotriène A empêche également la croissance dans plusieurs modèles d'angiogenèse, indiquant que ce composé possède un potentiel comme agent anticancéreux. Ces résultats renforcent l'idée que les inhibiteurs de la traduction possèdent un énorme potentiel en tant qu'agent anticancéreux, ainsi que comme outils afin de décortiquer les mécanismes gouvernant la synthèse protéique.
Jagatia, Fiona Jennifer. "Excited state interactions between organic molecules and molecular oxygen". Thesis, Keele University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246864.
Texto completoPanesar, Kuldeep Singh. "Quantum molecular dynamics of guest molecules in supramolecular complexes". Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10741/.
Texto completoZotti, Linda Angela. "Molecular ordering and STM imaging of functionalized organic molecules". Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479082.
Texto completoKirsch, Nicole. "Molecular recognition of poorly functionalised molecules with imprinted polymers". Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325167.
Texto completoRoskilly, Stephen. "Molecular field theory of nematics composed of flexible molecules". Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259682.
Texto completoWiles, Alan Andrew. "Redox active molecules with molecular electronics and synthetic applications". Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4878/.
Texto completoSymes, Mark D. "Walking molecules". Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3195.
Texto completoKay, Euan R. "Mechanized molecules". Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/12333.
Texto completoBrooke, Carly. "Synthesis, characterisation and single molecule conductance measurements of organic molecules". Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/9397/.
Texto completoPounds, Andrew J. "A generalized discrete dynamical search method for locating minimum energy molecular geometries". Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/27144.
Texto completoEckel, Rainer. "Single molecules and nanocrystals: molecular recognition forces and optomechanical switching". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978888227.
Texto completoSamorí, Paolo. "Self-assembly of conjugated (macro)molecules nanostructures for molecular electronics /". [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962281530.
Texto completoRoberts, Darren Leslie. "Molecular characterisation of the pro-apoptotic molecules APAF1 and Smac". Thesis, University of Leicester, 2001. http://hdl.handle.net/2381/30757.
Texto completoStoer, Marcell. "Molecular beam laser Stark spectroscopy of highly vibrationally excited molecules". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34285.pdf.
Texto completoJenny, Nicolas [Verfasser]. "Synthesis of New Functional Molecules for Molecular Electronics / Nicolas Jenny". München : Verlag Dr. Hut, 2012. http://d-nb.info/1026652278/34.
Texto completoComben, E. R. "The study of small molecules by high resolution molecular spectroscopy". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375245.
Texto completoAitken, Craig George. "Electron impact ionisation of molecular clusters and spatially oriented molecules". Thesis, University of Canterbury. Chemistry, 1995. http://hdl.handle.net/10092/7613.
Texto completoAdam, Colin John. "Molecular properties of mesogenic fragments and molecules from first principles". Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/10776.
Texto completoWright, Patricia Ann. "Understanding MS/MS fragmentation pathways of small molecular weight molecules". Thesis, University of Greenwich, 2015. http://gala.gre.ac.uk/18134/.
Texto completoMorisawa, Yusuke. "Spectroscopic study of some chemically significant molecules in molecular clouds". 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144599.
Texto completoTanjaroon, Chakree. "Rotational spectra and molecular structures of organometallic and organic molecules". Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280570.
Texto completoSpencer, Peter D. "Examining claims of long-range molecular order in water molecules". Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/121427/1/__qut.edu.au_Documents_StaffHome_StaffGroupH%24_halla_Desktop_Peter%20Spencer%20Thesis.pdf.
Texto completoMartínez, Rodríguez Luis. "Molecule and catalyst design for recognition and activation of small molecules". Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/398693.
Texto completoStrand, Joanna. "Affibody Molecules for PET Imaging". Doctoral thesis, Uppsala universitet, Institutionen för immunologi, genetik och patologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-259410.
Texto completoGottschalk, Thomas. "Switchable container molecules /". Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18067.
Texto completoHowell, Brian. "Signal transducing molecules". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39347.
Texto completoThe promoter region of the liver specific, glucocorticoid and cAMP inducible gene, CPSI was analyzed for transcriptional activity. Sequences extending from the in vivo start site of CPSI gene to $-$1200 bp, were shown to support in vitro transcription with liver nuclear extracts. A region proximal to transcription initiation, from $-$104 to $-$124 was shown to specifically interact with the abundant liver nuclear factor C/EBP. Double stranded oligonucleotides corresponding this cis element abolishes in vitro transcription reactions in a competitive manner. The C/EBP and related factors, LAP and LIP, interaction with CPSI promoter elements has implications in the developmental, liver-specific, as well as the inducible aspects of CPSI gene expression.
Ferguson, Jayne Louise. "Colossal Aromatic Molecules". Thesis, University of Canterbury. Chemistry, 2013. http://hdl.handle.net/10092/8108.
Texto completoGraham, Robert Leslie James. "Snake venom molecules". Thesis, University of Ulster, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398964.
Texto completoLewis, R. K. "Synthetic receptor molecules". Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356259.
Texto completoBarckholtz, Timothy Andrew. "Fragments of molecules /". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487952208108668.
Texto completoNewell, Catherine A. "INELASTIC COLLISIONS IN COLD DIPOLAR GASES". UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/30.
Texto completoFrancis, Simon George. "Microwave spectroscopy of metal-containing molecules and molecules of atmospheric interest". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508090.
Texto completoSwann, Andrew Thomas. "Characterization of polymer-supported homogeneous catalysts by molecular modeling". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26702.
Texto completoCommittee Chair: Ludovice, Pete; Committee Member: Grover, Martha; Committee Member: Jones, Christopher; Committee Member: Realff, Matthew; Committee Member: Sherrill, David. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Gromova, O. V. "High resolution molecular spectroscopy of the sulfur-containing XY2 type molecules". Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00534459.
Texto completoRohatgi, Priyanka. "Engineering Protein Molecular Switches To Regulate Gene Expression with Small Molecules". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19852.
Texto completoHofström, Camilla. "Engineering of Affibody molecules for Radionuclide Molecular Imaging and Intracellular Targeting". Doctoral thesis, KTH, Molekylär Bioteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116884.
Texto completoQC 20130129
Hauke, Christopher Moritz [Verfasser]. "Systematic functionalization of molecules for molecular self-assembly / Christopher Moritz Hauke". Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1035533227/34.
Texto completoÅkesson, Patrik. "Molecular Dynamics of the Adsorption of Organic Molecules on Organic Substrates". Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-103688.
Texto completoProject P25154-N20 "Hetero-epitaxy of organic-organic nanofibers"
Yaneva, Rakina Hristova [Verfasser]. "Molecular mechanism of peptide selection by MHC molecules / Rakina Hristova Yaneva". Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2012. http://d-nb.info/1035265060/34.
Texto completo