Dissertations / Theses on the topic 'Chemosensori'
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PIERSANTI, LUCA. "Nuovi chemosensori ottici aventi un derivato benzossazolico come unità sensibile." Doctoral thesis, Urbino, 2015. http://hdl.handle.net/11576/2628889.
Full textSamuelsen, Chad L. "Chemosensory processing in the amygdala." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-09212009-161414/.
Full textAdvisor: Michael Meredith, Florida State University, College of Arts and Sciences, Dept. of Biological Science. Title and description from dissertation home page (viewed on May 4, 2010). Document formatted into pages; contains xv, 131 pages. Includes bibliographical references.
Olofsson, Jonas. "Gender differences in chemosensory function." Licentiate thesis, Umeå University, Department of Psychology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-22533.
Full textThis thesis consists of two studies, in which gender differences in nasal chemosensory function are investigated. The first study assesses odor identification ability in a populationbased sample, varying from 45 to 90 yrs, screened for cognitive impairment and severe olfactory dysfunction. Results show that women are generally better than men at identifying odors, but there is no significant interaction of gender by age. Although odoridentification is influenced by semantic memory and cognitive speed, these cognitivefactors are unlikely to cause the observed gender difference in odor identification. The second study investigates chemosensory perception in men and women by assessing eventrelatedbrain potentials, and perceptual ratings for an odorant, which varies inconcentration and olfactory/irritating properties. The results display a generally larger cortical response in women than in men, beginning from about 350 ms after stimulus onset. Women report higher perceived intensity and npleasantness at the highest stimulus concentration, and a steeper psychophysical function, than do men. The results indicatethat stronger cortical responses of nasal chemosensory stimuli provide a neural basis for stronger supra-threshold perception in women than in men, which might enhance odor identification performance. The nature and causes of these gender-differences in nasal chemosensory function are discussed.
This thesis for the licenciate degree is based on the following studies:Larsson, M., Nilsson, L-G., Olofsson, J.K., & Nordin, S. (2004). Demographic and cognitive predictors of odor identification: Evidence from a population-based study.Chemical Senses, 29, 547-554.Olofsson, J.K., & Nordin, S. (2004). Gender differences in chemosensory perception andevent-related potentials. Chemical Senses, 29, 629-637.
Roberts, Craig Dane. "cAMP Signaling in Chemosensory Transduction." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/161.
Full textStephens, Bonnie Baggett. "Chemosensory Responses in Azospirillum brasilense." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/biology_diss/11.
Full textDujols, Virginie Elisabeth. "Rhodamine & anthracene-based chemosensors /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487941504294111.
Full textCabell, Larry Allen. "Chemosensors and competition sensing assays /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Full textFang, Albert Geeson. "Development of novel fluorescent chemosensors /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3138822.
Full textJin, Shan. "Development of Boronic Acid-Based Chemosensors." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/chemistry_diss/31.
Full textLau, Hsien Lee. "Chemosensory context conditioning in Caenorhabditis elegans." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/25779.
Full textMartinez, Rebecca L. "Chemosensory Evaluation of Prostate Cancer Cells." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/46316.
Full textMaster of Science
Mantotta, Jeevani Charika. "Analysis of chemosensory proteins in Rhodobacter sphaeroides." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249546.
Full textRogers, Stephen M. "Chemosensory development and integration in Locusta migratoria." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298420.
Full textSantos, Carla Isabel Madeira dos. "Corroles : synthesis, functionalization and application as chemosensors." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/11959.
Full textO trabalho de investigação apresentado nesta dissertação foi desenvolvido tendo como objectivo a síntese e funcionalização de meso-triarilcorróis para utilização como quimiossensores. Este trabalho encontra-se apresentado ao longo de cinco capítulos. No primeiro capítulo são apresentadas as características gerais, as metodologias de síntese e de funcionalização de macrociclos de tipo corrólico, e descrevemse algumas aplicações em que têm sido utilizados. São ainda abordadas algumas das propriedades e características dos quimiossensores e os mecanismos de deteção de diversos analítos. No segundo capítulo, após uma pequena introdução às reações de Wittig e de Diels-Alder, escolhidas para a funcionalização do macrociclo corrólico, descreve-se o estudo efectuado para a obtenção do complexo de gálio(III) do 3- vinil-5,10,15-tris(pentafluorofenil)corrol e o seu comportamento como dieno, em reações de Diels-Alder na presença dos dienófilos 1,4-benzoquinona e 1,4- naftoquinona. Desses estudos resultaram dois aductos cuja habilidade sensorial, bem como a dos seus precursores, foi estudada, em solução, na presença de aniões esféricos (F-, Br-, Cl-), lineares (CN-) e volumosos (CH3COO-, H2PO4 -). Dos macrociclos estudados verificou-se que o corrol base-livre 5,10,15-tris(pentafluorofenil)corrol apresenta uma elevada sensibilidade para o anião fluoreto (F-), e que a coordenação do núcleo corrólico com gálio(III) diminui a afinidade para este anião. Em geral, todos os compostos mostraram afinidade para o anião cianeto (CN-) mesmo quando em suportes poliméricos. O gel de poliacrilamida revelou-se muito promissor na determinação de CN- em amostras de água. No terceiro capítulo é avaliada a reatividade do complexo de gálio(III) do 3- vinil-5,10,15-tris(pentafluorofenil)corrol ainda como dieno mas agora na presença de um dienófilo linear, o acetilenodicarboxilato de dimetilo. Desse estudo resultaram dois novos derivados corrólicos. A habilidade sensorial dos mesmos perante os aniões fluoreto, cianeto, acetato, e fosfato foi avaliada por espectroscopia de absorção e emissão tendo um dos aductos mostrado ser colorimétrico para o anião cianeto. No quarto capítulo descreve-se a síntese e caracterização de dois conjugados do tipo corrol-cumarina, resultantes de reações de Hetero-Diels-Alder entre o 3-vinil-5,10,15-tris(pentafluorofenil)corrolatogálio(III)(piridina) e orto-quinonasmetídeos gerados in situ a partir de reacções de Knoevenagel entre cumarinas e paraformaldeído. Realizaram-se estudos de afinidade sensorial para aniões e catiões com estes macrociclos, bem como com conjugados porfirinacumarina análogos. A inserção de uma unidade cumarina conferiu uma excepcional solubilidade tendo os novos derivados apresentado solubilidade em etanol. No quinto e último capítulo desta dissertação é avaliada a capacidade sensorial do 5,10,15-tris(pentafluorofenil)corrol e da sua espécie monoaniónica, para os catiões metálicos Na+, Ca2+, Cu2+, Cd2+, Pb2+, Hg2+, Ag+, Al3+, Zn2+, Ni2+, Cr3+, Ga3+, Fe3+ em tolueno e acetonitrilo. Os macrociclos corrólicos mostraram ser selectivos e colorimétricos para o catião Hg2+. Neste trabalho descreve-se ainda a síntese do derivado -iminocorrol, que após funcionalização com o 3-isocianatopropiltrimetoxisilano originou um derivado do tipo alcoxisilano, que foi, posteriormente, ancorado a nanopartículas comerciais de sílica. As novas nanopartículas ancoradas com o alcoxisilano corrol foram estudadas na presença de Cu2+, Hg2+ e Ag+. Na presença do catião Ag+ assistiu-se a uma mudança de cor, de verde para amarelo.
The work described in this dissertation was focused on the synthesis of mesotriarylcorroles and their functionalization for later use as chemosensors. This work is divided in five chapters. In the first chapter it is described the general features of corroles, synthetic methodologies, the functionalization procedures and the applications of this kind of macrocycles. Additionally, some considerations about chemosensors and the importance of analytes that will be evaluated is also discussed. In the second chapter the Wittig and Diels- Alder reactions were chosen as post-functionalization procedures to apply to corroles. In this way, by the use of a Wittig reaction, the derivative 3–vinil-5,10,15- tris(pentafluorophenyl)corrolatogallium(III) was synthetized, from the corresponding 3-formy-5,10,15-tris(pentafluorophenyl)corrolatogallium(III), and its behavior as diene in Diels–Alder reactions, in the presence of the dienophiles 1,4-benzoquinone and 1,4-naphthoquinone was evaluated. These studies afforded two Diels-Alder adducts whose sensorial ability, as well as of their precursors, was studied in solution in the presence of spherical( F -, Br -, Cl -), linear (CN-) and bulky (CH3COO-, H2PO4 -) anions. The 5,10,15- tris(pentafluorophenyl)corrole showed to be the most sensitive macrocycle to the fluoride anion (F-). Although all derivatives have interacted with this anion the coordination of the corrole core with gallium(III) decreased their affinity for this anion. In general, all compounds showed interaction with cyanide (CN-) anions. By these results two low cost polymers based on polymethylmethacrylate and polyacrylamide were prepared and used in the detection of CN- in water. The polyacrylamide gel proved to be very promising. In the third chapter the reactivity of the gallium(III) (pyridine) complex of 3-vinyl- 5,10,15-tris(pentafluorophenyl)corrole as a diene was extended to dimethyl acetylenedicarboxylate as dienophile. This study afforded two new corrole derivatives. The sensorial ability of the new macrocycles towards fluoride, cyanide, acetate and phosphate anions was carried out by absorption and emission spectroscopy. One of the derivatives showed to be colorimetric to cyanide, where a change of colour from green to colourless was visualized. In the fourth chapter is described the synthesis and characterization of two new derivatives resulting from hetero-Diels-Alder reactions between the gallium(III) (pyridine) complex of 3-vinyl-5,10,15-tris(pentafluorophenyl)corrole and oquinone methides (o-QM) generated in situ from Knoevenagel reactions of coumarins with paraformaldehyde. The sensing ability of the resulting compounds was studied in the presence of different anions and cations. These sensorial studies were extended to porphyrin-coumarin analogues. The insertion of a coumarin moiety conferred an unusual solubility to these conjugates in ethanol. In the last chapter is shown the sensorial ability of 5,10,15- tris(pentafluorophenyl)corrole and of its monoanionic species towards Na+, Ca2+, Cu2+, Cd2+, Pb2+, Hg2+, Ag+, Al3+, Zn2+, Ni2+, Cr3+, Ga3+, Fe3+ metal ions in toluene and acetonitrile. The photophysical studies towards metal ions were carried out by absorption and emission spectroscopy. These corroles showed to be selective and colorimetric for Hg2+. In addition a new - imine corrole was successful synthetized and further functionalized with 3-isocyanatopropyltrimethoxysilane resulting an alkoxysilane derivative. The grafting of alkoxysilane derivative, with optically transparent silica nanoparticles (SiNPs) was also performed. The new-coated silica nanoparticles with corrole were studied in the presence of Cu2+, Hg2+ and Ag+ as metal ion probes. In the presence of Ag+ was observed a change of colour from green to yellow.
Cheung, Sin Man. "Development of optical chemosensors for cation sensing." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/771.
Full textRosa-Gastaldo, Daniele. "Supramolecular chemosensors for the detection of phenethylamines." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3425410.
Full textIn questa tesi ho descritto e discusso i risultati ottenuti nell’ambito di un progetto di ricerca focalizzato sull’applicazione e lo sviluppo della tecnica dell’NMR-chemosensing. Questa tecnica è basata sulla combinazione di nanoparticelle d’oro da 2 nm di diametro passivate con opportuni tioli e di particolari esperimenti NMR e consente di “estrarre” dallo spettro NMR di una miscela di composti lo spettro NMR dell’analita riconosciuto dalla nanoparticella. In particolare, lo scopo primario del mio lavoro è stato dimostrare come questa tecnica possa essere usata con successo per il rilevamento delle cosiddette “designer drugs”. La maggior parte delle nuove droghe immesse sul mercato ogni anno altro non sono che analoghi strutturali di droghe già diffuse. Ciò rappresenta un grave problema di salute pubblica, perché non essendo queste nuove sostanze mai state studiate, non se ne conoscono i potenziali rischi e gli effetti a lungo termine. In più, non esistendo standard di riferimento, la loro rilevazione con tecniche tradizionali risulta difficoltosa. La tecnica che verrà descritta è stata testata e funziona anche su campioni reali, senza bisogno di pretrattamento del campione, e dà la possibilità di arrivare dal sequestro alla caratterizzazione strutturale della sostanza stupefacente nel giro di poche ore. Dimostrerò anche che per migliorare le potenzialità dell’NMR-chemosensing in termini sia di sensibilità che versatilità si può agire su un doppio fronte. Da un lato, è possibile migliorare la struttura del tiolo che ricopre le nanoparticelle, ottenendo un monostrato con maggior affinità e maggior capacità di trasferimento della magnetizzazione, entrambi aspetti fondamentali della tecnica. Dall’altro, è possibile migliorare la sensibilità agendo direttamente sul tipo di esperimento utilizzato, anche in abbinamento ad astuzie che possano aumentare l’efficienza del trasferimento di magnetizzazione, quali ad esempio usare l’acqua intrappolata nel monostrato come fonte supplementare di magnetizzazione oppure sfruttare la capacità delle nanoparticelle d’oro di autoassemblarsi su nanosfere di silice per aumentare le dimensioni del nanorecettore. Combinando tutte queste accortezze, dimostrerò come sia possibile analizzare con questa tecnica anche specie inorganiche, come K+, che di per sé non possiedono alcun segnale NMR. Infine, visto che l’NMR non è, per ora, una tecnica di facile applicazione per analisi sul campo, nell’ultima parte di questo lavoro di tesi mi sono occupato anche un sensore point-of-care sviluppato sotto forma di cartina indicatrice, in cui un recettore supramolecolare autoassemblato composto da un cucurbiturile e un colorante può indicare selettivamente la presenza o meno di sostanza stupefacenti in modo rapido, sicuro ed economico.
Zhu, Jianfa. "Fluorescent chemosensor development based on multifunctional spirobenzopyrans." HKBU Institutional Repository, 2011. https://repository.hkbu.edu.hk/etd_ra/1299.
Full textWilliams, James Anthony Gareth. "Luminescence behaviour of macrocycle metal complexes." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5313/.
Full textPancholi, Jessica. "Novel 'click' generated sensors and molecular machines for fluorescent sensing of Zn2+." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/15017.
Full textCrowley-Gall, Amber. "Mechanisms underlying host shift in cactophilic Drosophila." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553613245542061.
Full textFink, Elie Marina-Lora 1989. "Diversity of chemosensory behaviour in the Drosophila genus." Doctoral thesis, Universitat Pompeu Fabra, 2017. http://hdl.handle.net/10803/664282.
Full textEste trabajo de tesis explora la diversidad del comportamiento olfativo de las especies de Drosophila con un enfoque comparativo. Identificamos diferencias en los niveles de atracción de la larva de ocho especies, hacia olores naturales derivados de sus ecologías. Relacionamos estas diferencias con distintas estrategias de quimiotaxis que surgen de la modulación única de varias variables sensomotoras, así como debido a cambios genéticos que ocurren a nivel de los genes de los receptores de olor. Además, detallamos la organización de las secuencias de comportamiento formando la locomoción de la larva en diferentes especies de Drosophila y revelamos estilos de forrajeo únicos que resultan en estrategias diferenciadas de reacciones de fuga o de confinamiento en presencia de gradientes de luz, conocidos por evocar reacciones de evasión en Drosophila. También describimos la existencia de dicotomías sorprendentes de las preferencias de olor entre las especies, dando como resultado un cambio prominente de la atracción a la aversión en la larva de Drosophila suzukii, y detallamos cómo esta observación reveló olores con modos tóxicos de acción, confiriendo parálisis en la mosca adulta de solamente algunas especies de Drosophila, y su posible aplicación como pesticidas ecológicos.
Cancellieri, Paul Joseph. "CHEMOSENSORY ATTRACTION OF PFIESTERIA SPP. TO FISH SECRETA." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010402-173118.
Full textDinoflagellates represent a diverse group of both auxotrophic and heterotrophic protists. Most heterotrophic dinoflagellates are raptorial feeders that encounter prey using ?temporal-gradient sensing? chemotaxis wherein cells move along a chemical gradient in a directed manner toward the highest concentration. Using short-term ?memory? to determine the orientation of the gradient, dinoflagellates swim in a ?run-and-tumble? pattern, alternating directed swimming with rapid changes in orientation. As the extracellular concentration of the attractant increases, a corresponding increase in the ratio of net-to-gross displacement results in overall movement toward the stimulus.The dinoflagellates Pfiesteria piscicida and P. shumwayae are heterotrophic estuarine species with complex life cycles that include amoeboid, flagellated, and cyst stages, that have been implicated as causative agents in numerous major fish kills in the southeastern United States These organisms show documented ?ambush-predator? behavior toward live fish in culture, including rapid transformations among stages and directed swimming toward fish prey in a manner that suggests the presence of a strong signalling relationship between live fish and cells of Pfiesteria spp.Zoospores of the two species of Pfiesteria can be divided into three functional types: TOX-A designates actively toxic isolates fed on fish prey; TOX-B refers to temporarily non-toxic cultures that have recently (1 week to 6 months) been removed from fish prey (and fed alternative algal prey); and NON-IND refers to isolates without apparent ichthyotoxic ability (tested as unable to kill fish in the standardized fish bioassay process; or without access to fish for ca. 1.5 years). Several Pfiesteria-like dinoflagellates have been isolated from samples in which P. piscicida and P. shumwayae are also present, including several cryptoperidiniopsoid species that have repeatedly been tested as lacking ichthyotoxic capability under ecologically relevant conditions (cell densities that occur in estuaries).Microcapillary assay techniques were employed to determine the attraction of P. piscicida and P. shumwayae zoospores to sterile-filtered fish mucus and excreta. Differences in attraction were measured among functional types, and between these two species and several isolates of cryptoperidiniopsoids, in ten-minute trials in which zoospores entering tubes filled with test substances were observed and counted. TOX-A zoospores of both P. piscicida and P. shumwayae were strongly and comparably attracted to fish secreta/excreta, relative to their behavior toward microcapillary tubes that were filled with filtered seawater. TOX-B zoospores of both Pfiesteria species showed intermediate attraction toward fish materials that appeared to be inversely related to time isolated from fish prey. NON-IND zoospores exhibited low attraction to fish materials. Cryptoperidiniopsoid zoospores showed moderate attraction with no apparent influence of previous exposure to fish.In an additional experiment that examined the signal activity in fish materials over time after collection from fresh fish, unfiltered fish materials ceased to attract P. piscicida zoospores after approximately 48 hours and ultrafiltered materials maintained attractive ability over the duration of the experiment (72 hours). These data show that filtration of fish materials may be used to extend the useful life of the chemical signal, possibly by removing bacteria that consume or degrade it.In recent years, several researchers have identified fish kairomones (pheromones that benefit the recipient) present in fish mucus that induce life history and behavioral changes in a range of zooplankters. It is likely that one or more of these kairomones, or similar compounds, are responsible for the behavioral and developmental changes observed in Pfiesteria spp. in the presence of live fish. Data from these experiments support the current understanding that significant behavioral differences exist between functional types of Pfiesteria spp., and between these toxic dinoflagellate species and known lookalike dinoflagellates without ichthyotoxic activity under ecologically relevant conditions.
Warren, Anna Victoria. "Analysis of the chemosensory operons of Rhodobacter sphaeroides." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275380.
Full textJacobs, Stephen P. "Chemosensory proteins and odorant binding proteins in aphids." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435766.
Full textKuntner, Jochen [Verfasser]. "Oil Condition Monitoring Using Physical Chemosensors / Jochen Kuntner." Aachen : Shaker, 2008. http://d-nb.info/1164342134/34.
Full textGrantham, Andrew James. "The development of portable chemosensors for atmospheric radicals." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/20210/.
Full textFigueira, Flávio Alberto da Silva. "Expanded porphyrins and their evaluation as anion chemosensors." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13247.
Full textExpanded porphyrins are synthetic analogues of porphyrins, differing from the last ones and other naturally occurring tetrapyrrolic macrocycles by containing a larger central core, with a minimum of 17 atoms, while retaining the extended conjugation features that are a tremendous feature of these biological pigments. The core expansion results in various systems with novel spectral and electronic features, often uniques. Most of these systems can also coordinate cations and/or anions, and in some cases they can bind more than one of these species. In many cases, these molecules display structural features, such as non-planar structures, that have no antecedents in the chemistry of porphyrins or related macrocyclic compounds. This work will discuss several synthetic approaches for the synthesis of expanded porphyrins, namely the construction of new building blocks by Michael addition, as well as potential synthetic routes towards expanded porphyrins. The synthesis of smaller oligopyrrolic compounds namely, bipyrroles and dipyrromethanes, not only were developed for the synthesis of expanded porphyrins as they were also used in Knoevenagel condensations furnishing chromogenic compounds able to recognize different anions in solution. Also, an approach to the synthesis of novel expanded porphyrins namely sapphyrins has been done by aza-Michael additions. Several synthetic routes towards the synthesis of pyridyl and pyridinium N-Fused pentaphyrins and hexaphyrins have been explored in order to achieve compounds with potential applications in catalysis and PDI, respectively. Studies on the synthesis of compounds with potential anion binding properties, led to the structural characterization and NMR anion binding studies of [28]hexaphyrins functionalized with several diamines in the para position of their pentafluorophenyl groups. These compounds allow NH hydrogen bond interactions with various anions. All synthesized compounds were fully characterized by modern spectroscopic techniques.
Porfirinas expandidas são análogos sintéticos das porfirinas, diferindo destes apenas por possuírem um core contendo no mínimo 17 átomos. A expansão do core resulta em vários sistemas com novas características electrónicas e espectrais, e numa extraordinária química de coordenação. Em muitos casos é também possível interação supramolecular com um ou vários aniões. Outra característica interessante é a possibilidade destes macrociclos acomodarem mais do que um estado de oxidação variando as suas características de aromaticidade e planaridade sem antecedentes na química de macrociclos tetrapirrólicos e derivados. Este trabalho discute diversas rotas de síntese de macrociclos expandidos e sua derivatização, bem como a síntese de precursores bipirrólicos sobejamente conhecidos pela sua utilização como precursores na síntese de Porfirinas expandidas. Para este fim, unidades do tipo bipirrolico foram funcionalizadas através de adições de Michael. Estes pequenos compostos foram também derivatizados através de condensações de Knoevenagel para aplicação em coordenação de aniões demonstrando reconhecimento de diferentes aniões mediante uma variação de cor específica. No seguimento destes estudos de reactividade por Diels-Alder e/ou adições de Michael obtiveram-se novos derivativos do tipo safirina com substituições no interior do macrociclo. Tendo em vista a síntese de compostos com reconhecimento de aniões e potencial aplicação em PDT/PDI e catálise, macrocrociclos do tipo pentafirina e hexafirina foram derivatizados com diversos nucleófilos. Neste último, a introdução de grupos amino na sua periferia conduziu a um aumento drástico da capacidade de interação com aniões em solventes polares. Estudos de RMN com os compostos capazes de reconhecer aniões possibilitou a sua total caracterização estrutural demonstrando estruturalmente os grupos que participam no reconhecimento de aniões. Todos os compostos presentes sintetizados foram caracterizados estruturalmente com recurso a diversas técnicas espectroscópicas, nomeadamente: à ressonância magnética nuclear de protão, carbono 13 e de flúor 19, à absorção no Ultravioleta-Visível, à espectrometria de massa e sempre que possível a análise de raio-X de monocristal.
Wolfram, Wendi K. "Scent-marking : investigating chemosensory signals in wolf urine." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14207.
Full textScott, Jodie Catherine. "Che6 chemosensory regulation of multicellularity in myxococcus xanthus." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1077.
Full textMummolo, Liviana <1992>. "Nanostructured luminescent chemosensors for environmental and biomedical applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9836/1/PhD_Thesis_XXXIIIcycle_LMummolo_upload2.pdf.
Full textZiyatdinov, Andrey. "Biomimetic set up for chemosensor-based machine olfaction." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/285128.
Full textEsta tesis se enmarca en el campo de bioingeneria, mas particularmente en la configuración de un sistema experimental de sensores de gases químicos. Quizás más que en cualquier otra modalidad de sensores, los sensores químicos representan un conjunto de retos técnicos y conceptuales ya que deben lidiar con problemas como su baja especificidad, su respuesta temporal lenta, su inestabilidad a largo plazo, su alto consumo enérgético, su portabilidad, así como la necesidad de un sistema de datos y código robusto. En la última década, se ha observado una clara tendencia por parte de los sistemas de machine olfaction hacia la imitación del sistema de olfato biológico de insectos y mamíferos. Los diseñadores de estos sistemas se inspiran del sistema olfativo biológico, ya que los animales cumplen, sin apenas esfuerzo, algunos de los escenarios no resueltos en machine olfaction. Por ejemplo, las polillas machos recorren largas distancias para localizar las polillas hembra, detectando sus feromonas de forma rápida y robusta. La detección biomimética de gases químicos tiene como objetivo identificar los elementos fundamentales de la vía olfativa a todos los niveles, desde los receptores olfativos hasta el sistema nervioso central, y simular, en cierta medida, el funcionamiento de estos bloques, lo que permitiría acercar el rendimiento de la detección al rendimiento de los sistemas olfativos conociodos de los animales. Esto conlleva nuevos requisitos técnicos a nivel de equipamiento tanto hardware como software utilizado en este tipo de experimentos de machine olfaction. Este trabajo propone un enfoque bioinspirado para la ¿machine olfaction¿, explorando a fondo la parte tecnológica. A nivel hardware, un ordenador embedido se ha ensamblado, siendo ésta la parte más importante de la configuración experimental. Este ordenador integrado está interconectado con dos módulos principales biomiméticos diseñados por los colaboradores: una matriz de sensores a gran escala y una plataforma móvil robotizada para experimentos autónomos. A nivel software, el kit de desarrollo software se ha diseñado para recoger los modelos neuromórficos de los colaboradores para el procesamiento de las entradas sensoriales como en la vía olfativa biológica. La virtualización del sistema fue una de las soluciones ingenieriles clave de su desarrollo. Al ser un dispositivo, el sistema se ha transformado en un sistema virtual para la realización de simulaciones de datos, donde el entorno de software es esencialmente el mismo, y donde los sensores reales se sustituyen por sensores virtuales procedentes de una herramienta de simulación de datos especialmente diseñada. La propuesta de abstracción del sistema resulta en un ecosistema que contiene tanto los modelos del sistema olfativo como la matriz virtual . Este ecosistema se puede cargar en cualquier ordenador personal como una imagen del sistema desarrollado. Además de los productos de ingeniería entregados en esta tesis, los resultados científicos se han publicado en tres artículos en revistas, dos capítulos de libros y los proceedings de dos conferencias internacionales. Los principales resultados en la validación del sistema en el escenario de la localización robótica de olores se presentan en los capítulos del libro. Los tres artículos de revistas abarcan el trabajo en la herramienta de simulación de datos para machine olfaction: el novedoso modelo de drift, los modelos para simular la matriz de sensores basado en el conjunto de datos de referencia, y la parametrización de los datos simulados y los benchmarks propuestos por primera vez en machine olfaction. Esta tesis ofrece una base sólida para la investigación en simulaciones biomiméticas y en algoritmos en machine olfaction. Los resultados obtenidos en la tesis pretenden dar lugar a nuevas aplicaciones bioinspiradas en machine olfaction, lo que podría tener un significativo impacto en el área de investigación en ingeniería biomédica
Gaaboub, Ibrahim Abd Alla. "Neural processing of chemosensory information from the locust legs." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961248831.
Full textTousson, Ehab Mostafa. "Neural processing of chemosensory information from the locust ovipositor." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961892293.
Full textBokeloh, Frank. "Development of organic microelectromechanical chemosensors based on fiber optics." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2381.
Full textA classical (bio)sensor consists of two key components: A receptor layer that detects the analyte of interest and the transducer which converts the chemical / biological stimuli into a physical measurable signal. Ideally a sensor is label-free, highly sensitive and selective towards the target, requires low sample amount and shows a fast response time. Regarding these criteria microelectromechanical systems (MEMS) offer great potential for the sensor development. One interesting approach for this development are functional polymer materials, such as molecularly imprinted polymers (MIPs), that can be either integrated to existing MEMS based on silicon or completely replace the silicon technology. The emphasis of this thesis is focused on the development of a MEMS sensor based on (functional) polymers. In an initial chapter (chapter 2) new fabrication schemes for functional polymers are introduced. Inkjet-printed biochips based on MIPs are presented and a technique based on controlled radical polymerization is shown that allows the deposition of thin MIP shells on a microfabricated pattern. In the second part of this chapter the fabrication of molecularly imprinted polymers by two-photon stereolithography is shown which can be seen as an extension of 3dimensional printing. As possible application of this rapid prototyping technology two sensors based on MIPs are introduced a diffraction grating sensor and a microcantilever sensor. The two main chapters of this manuscript (chapter 3 and chapter 4) report the development of a new fabrication concept for MEMS sensors. It is based on the polymerization of a high aspect ratio beam on the extremity of an optical telecommunication fiber which was actuated at resonance and thus could be used as a cantilever sensor. The polymer sensor allowed the integration of MIPs as sensing element and the selective recognition of the antibiotic enrofloxacin. Furthermore, is a new, integrated read-out scheme presented in chapter 4. This read-out scheme integrates the optical fiber, by guiding a probe laser beam through it and attached cantilever beam. The output light beam is then focused on a position sensitive photodiode and thus enabled to monitor the resonance spectra of the polymer beam. The read-out scheme is characterized and its performance is shown by demonstrating the mass sensitivity of the polymeric cantilever beam and by measurements in liquid environments
Crisinel, Anne-Sylvie. "Tasty sounds : crossmodal associations between chemosensory and auditory stimuli." Thesis, University of Oxford, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558524.
Full textHartley, Lauren Elizabeth. "Characterisation of the Aspartate Chemosensory Receptor of Campylobacter jejuni." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/366822.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Medical Science
Griffith Health
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Hull, Mark Q. "The role of semiochemicals in the behaviour and biology of Lepeophtheirus salmonis (Kroyer, 1837) : potential for control?" Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310772.
Full textRichgels, Phoebe K. "Association of naturally occurring polymorphisms in odorant receptors with variation in olfactory behavior in Drosophila melanogaster." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307043748.
Full textGill, Daljeet Singh. "Olfactory development models driven by population coded chemosensor input." Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/30216.
Full textYuan, Hongyan. "Development of mode-filtered light chemosensor and its applications." HKBU Institutional Repository, 2002. http://repository.hkbu.edu.hk/etd_ra/422.
Full textBertrand, Jacob Joseph. "Genetic analysis of the Chp chemosensory system of Pseudomonas aeruginosa." 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:3378483.
Full textPisut, Daniel P. (Daniel Peter). "The distance chemosensory behavior of the sea urchin Lytechinus variegatus." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5129.
Full textMoeller, Lisa Marie [Verfasser]. "Physiological characterization of chemosensory mechanisms in mice / Lisa Marie Moeller." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1065960441/34.
Full textTurkewitsch, Petra. "The synthesis of fluorescent chemosensors responsive tocAMP and other nucleotides." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0018/NQ44611.pdf.
Full textRiordan, Jr Timothy J. "Chemosensory-Mediated Deposit Feeding in the Spionid Polychaete Dipolydora Quadrilobata." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/RiordanTJ2001.pdf.
Full textThompson, Stephen Richard. "A study of multiple chemosensory gene homologues in Rhodobacter sphaeroides." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436968.
Full textYou, Qihua. "Development of fluorescent chemosensors based on different signal transduction mechanisms." HKBU Institutional Repository, 2014. https://repository.hkbu.edu.hk/etd_oa/95.
Full textPisut, Daniel P. "The distance chemosensory behavior of the sea urchin Lytechinus variegatus." Connect to this title online, 2004. http://etd.gatech.edu/theses/available/etd-01052004-121047/.
Full textTitle from PDF t.p. (viewed on Oct. 28, 2006). Julia Kubanek, Committee Member; Mark Hay, Committee Member; Marc Weissburg, Committee Chair. Includes bibliographical references (p. 47-51).
Shah, Alok Shirish. "Structural maintenance and chemosensory function of human airway motile cilia." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/2983.
Full textDarnell, Cynthia Lynn. "Chemosensory regulation of development and heme homeostasis in Myxococcus xanthus." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/2063.
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