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Dissertations / Theses on the topic 'Ammonia molecule'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Steer, Edward. "Development and characterisation of a cold molecule source and ion trap for studying cold ion-molecule chemistry." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:13c3a622-ba78-4a53-902c-666ec461f708.

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A novel apparatus, combining buffer-gas cooling, electrostatic velocity selection and ion trapping, has been constructed and characterised. This apparatus is designed to investigate cold ion-molecule chemistry in the laboratory, at a variable translational and internal (rotational) temperature. This improves on previous experiments with translationally cold but rotationally hot molecule sources. The ability to vary the rotational temperature of cold molecules will allow for the experimental investigation of post-Langevin capture theories.

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2

Twyman, Kathryn S. "Electrostatic extraction of buffer-gas-cooled beams for studying ion-molecule chemistry at low temperatures." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:583d8060-5570-401d-a8f8-ef5751cfebbb.

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This thesis describes the design, construction, operation, and characterisation of an experimental apparatus that produces a source of internally cold, slow molecules that can be used for studying ion-molecule reactions at low temperatures. The apparatus combines buffer-gas cooling with a bent quadrupole velocity selector to cool both the translational and rotational degrees of freedom of the molecules. A cold cell (6 K) is filled with a buffer gas, such as helium, that exhibits sufficiently high vapour pressure for cryogenic applications. Hot molecules (150 to 300 K) enter the cell and therma

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3

Furtado, Neto Alexandre. "O potêncial de poço duplo e a molécula de amônia /." Guaratinguetá : [s.n.], 2012. http://hdl.handle.net/11449/91817.

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Orientador: Antonio Soares de Castro<br>Banca: Denis Dalmazi<br>Banca: Manuel Bastos Malheiro de Oliveira<br>Resumo: O foco deste trabalho é o espectro de inversão da molécula de amônia, resultado do fenômeno do tunelamento quântico. Para isso, usamos um modelo simplicado, uni- dimensional, suscetível a uma análise teórica rigorosa usando a mecânica quântica não- relativística. Dentre as diversas funções hamiltonianas já estudadas para este modelo, zemos uma rápida apreciação dos trabalhos de Cohen, Dennison-Uhlenbeck, Manning, Merzbacher e Rosen-Morse. Para um estudo mais profundo, usamos o

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4

Furtado, Neto Alexandre [UNESP]. "O potêncial de poço duplo e a molécula de amônia." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/91817.

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Made available in DSpace on 2014-06-11T19:25:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-12-12Bitstream added on 2014-06-13T20:33:08Z : No. of bitstreams: 1 furtadoneto_a_me_guara.pdf: 575510 bytes, checksum: 6a1a49e71ce6fbc8113435f66d99a240 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O foco deste trabalho é o espectro de inversão da molécula de amônia, resultado do fenômeno do tunelamento quântico. Para isso, usamos um modelo simpli cado, uni- dimensional, suscetível a uma análise teórica rigorosa usando a mecânica quântica não- relativístic

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5

Förster, Johann Jakob. "Molecules exposed to Intense, Ultrashort Laser Fields." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19149.

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Das Ionisierungsverhalten kleiner Moleküle (insbesondere H2 und NH3) in intensiven, ultrakurzen Laserfeldern wird theoretisch untersucht. Das Hauptaugenmerk liegt dabei auf dem Einfluss der Kerndynamik. Zunächst wird das Ionisierungsverhalten des H2-Moleküls bei eingefrorener Kernschwingung untersucht. Bereits im Rahmen dieser Näherung kann im Mehrphotonenregime ein zuvor beobachteter Zusammenbruch der Näherung im Gleichgewichtsabstand festgehaltener Kerne erklärt werden. Weiterhin wird der Übergang vom Mehrphotonen zum quasistatischen Ionisierungsregime für 800-nm-Laserfelder untersucht. E

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6

Koutit, Abbès. "Reactions chaudes entre atomes de tritium et composes inorganiques (h : :(2)o, h::(2)s, nh::(3))." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13029.

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7

Rusher, Cassandra Amelia. "Inelastic scattering dynamics of ammonia with small molecules." Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3275.

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Crossed molecular beam velocity map imaging (VMI) is employed to state-selectively record the NH3 inelastic scattering products from collisions with a series of colliders; atomic Ar, diatomic D2, and the polyatomics CH4, C2H6 and C(CH3)4. The differential cross sections (DCSs) presented for NH3-Ar expand on the existing literature. The angular distribution of the scattering is found to exhibit a dependence on the angular momentum projection quantum number (k) of the NH3 product state in addition to the known dependency on the total angular momentum quantum number (J). It is found that for incr

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8

Alzerreca, Jose Javier. "Molecular Characterization of Soil Ammonia-Oxidizing Bacteria Based on the Genes Encoding Ammonia Monooxygenase." DigitalCommons@USU, 1999. https://digitalcommons.usu.edu/etd/3644.

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Ammonia-oxidizing bacteria (AOB) are chemolithotrophs that oxidize ammonia/ammonium to nitrite in a two-step process to obtain energy for survival. AOB are difficult to isolate from the environment and iso lated strains may not represent the diversity in soil. A genetic database and molecular tools were developed based on the ammonia monooxygenase (AMO) encoding genes that can be used to assess the diversity of AOB that exist in soil and aquatic environments without the isolation of pure cultures. The amo genes have excellent potential as molecular markers; since AMO is only found in the AOB a

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9

Cao, Huiluo, and 曹慧荦. "Molecular ecology of ammonia oxidizing archaea and bacteria." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47155358.

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The newly recognized ammonia-oxidizing archaea (AOA) makes re-evaluation of the contribution to ammonia oxidization by both AOA and ammonia-oxidizing bacteria (AOB) necessary and meaningful. The growing population and increasing anthropogenic activities around coastlines have affected wetland and coastal marine ecosystems through discharging polluted water containing large amounts of reactive inorganic nitrogen. The objectives of this study were to detect the phylogenetic diversity and abundance of ammonia oxidizers including AOA and AOB on different scales and to elucidate the distribution p

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10

Nightingale, Jonathan Ramsay. "Spectroscopy of NHâ†2 as photofragment from ammonia." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292455.

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11

Schillinger, Eric Francois Joseph. "Investigation on the applications of molecular fluorescence and energy transfer in environmental analysis." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341022.

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12

Ballinger, Stuart John. "Molecular ecology of nitrification in a denitrification nitrification wastewater treatment system." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312005.

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13

Estejab, Ali. "Mathematical and Molecular Modeling of Ammonia Electrolysis with Experimental Validation." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1514834805432007.

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14

Harju, J., F. Daniel, O. Sipilae, et al. "Deuteration of ammonia in the starless core Ophiuchus/H-MM1." EDP SCIENCES S A, 2017. http://hdl.handle.net/10150/624367.

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Context. Ammonia and its deuterated isotopologues probe physical conditions in dense molecular cloud cores. The time-dependence of deuterium fractionation and the relative abundances of different nuclear spin modifications are supposed to provide a means of determining the evolutionary stages of these objects. Aims. We aim to test the current understanding of spin-state chemistry of deuterated species by determining the abundances and spin ratios of NH2D, NHD2 and ND3 in a quiescent, dense cloud. Methods. Spectral lines of NH3, NH2D, NHD2, ND3 and N2D+ were observed towards a dense, starless c

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15

Glüer, Arne. "Cooperative (De-)Hydrogenation of Small Molecules." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E571-C.

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16

Mendum, Thomas Alan. "The molecular ecology of autotrophic ammonia oxidising bacteria in agricultural soils." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324014.

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17

Bradley, J. M. "A molecular beam study of the ammonia oxidation reaction on Pt{100}." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361744.

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18

Aida, Adlimoghaddam. "Molecular and physiological characterization of the nitrogen transport system in Caenorhabditis elegans." Journal of experimental biology (JEB), 2014. http://hdl.handle.net/1993/30721.

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In this study, we investigated the mechanism of nitrogen excretion in the soil nematode Caenorhabditis elegans. Utilizing the scanning ion electrode technique (SIET), it was shown for the first time in nematodes that the excretory cell promotes a secretion of ions, including Na+, K+, H+ and Ca2+. In addition, observations from experiments exposing the animal to various environmental pH regimes suggested that the mode of ammonia excretion is dependent on acidification of the unstirred boundary layer, supported also by a detected H+-net-excretion over the hypodermis employing SIET. Pharmacologic

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19

Vanfleteren, Thomas. "HIGH-RESOLUTION NEAR-INFRARED LASER SPECTROSCOPY OF AMMONIA- AND WATER-CONTAINING MOLECULAR COMPLEXES." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/258689.

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La caractérisation des complexes de van der Waals est déterminante pour la compréhension et la modélisation des atmosphères planétaires et du milieu interstellaire. Cependant, ces agrégats moléculaires sont assez peu étudiés, particulièrement dans l’infrarouge proche. Cette thèse a pour but d’enrichir les connaissances sur les complexes d’eau et d’ammoniac dans cette région spectrale. Pour cela, nous avons utilisé un montage expérimental appellé FANTASIO+, couplant une expansion su- personique à un spectromètre à temps de déclin (CRDS). Plusieurs complexes de van der Waals ont pu être observés

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20

Wang, Yongfeng, and 王永峰. "Molecular analysis of ammonia oxidizing prokaryotes in mangrove wetlands and factors affecting their dynamics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50434421.

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Ammonia/ammonium-oxidizing prokaryotes (AOPs) play a crucial role in nitrogen transformation in the natural ecosystems including mangrove wetlands. The objectives of the present study were to investigate the spatial and temporal distribution of AOPs in the mangrove wetland sediments in subtropical Hong Kong and their ecophysiology. When AOP communities and abundances in a natural coastal mangrove wetland and a constructed freshwater wetland were compared, the constructed freshwater wetland contained a broader range of phylotypes, higher diversity, more complex community structures, and mor

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21

Dolman, Mark. "Synthetic host molecules for cations and alkyl ammonium salts." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385149.

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22

Tamburrino, Giulia. "Structural characterization of bacterial membrane proteins via molecular dynamics simulations and electrophysiology." Thesis, University of Dundee, 2018. https://discovery.dundee.ac.uk/en/studentTheses/224d87fb-307f-49ba-82ec-e119b813e549.

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In this dissertation, I employed a combination of in vitro and in silico techniques to characterize two bacterial membrane proteins: the MtrE efflux conduit from Neisseria gonorrhoeae and the AmtB ammonia transporter from Escherichia coli. MtrE is an efflux conduit located in the outer membrane of N. gonorrhoeae. It can form a protein complex with MtrC (a periplasmic adapter) and MtrD (an inner membrane active transporter). This tripartite machinery actively extrudes a diverse set of compounds from the periplasm to the exterior of the bacteria. The MtrCDE complex and homologous tripartite effl

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23

Cardy, Donald Leonard Nicholas. "The molecular biology of ammonia assimilation in the obligate methanotroph Methylococcus capsulatus strain Bath." Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/110004/.

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The structural gene (g1nA) encoding the ammonia assimilation enzyme glutamine synthetase (GS) has been cloned from the obligate methanotroph Methylococcus capsulatus (Bath). Complementation of Escherichia coli and Klebsiella pneumoniae g1nA mutants was demonstrated. In vitro and in vivo expression analysis revealed the cloned g1nA gene to encode a polypeptide with an apparent M_r of 60,000 as determined by PAGE. Expression of the M. capsulatus (Bath) g1nA gene in E. coli was found to be regulated by nitrogen levels in an Ntr+ but not an Ntr− background. This regulation was not observed when th

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24

Watanabe, Yukio. "Molecular breeding of yeast Saccharomyces cerevisiae for effective ammonia production from food processing wastes." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263698.

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25

Whitby, Corinne. "Application of molecular biological techniques to study autotrophic ammonia-oxidising bacteria in freshwater lakes." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366421.

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26

Redaelli, Elena. "Interstellar ammonia emission: unveiling the dynamics of a star-forming core." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12186/.

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Questo lavoro di Tesi si occupa dello studio della regione di recente formazione stellare nota come Barnard 59. L’analisi si basa principalmente sullo studio dell'emissione molecolare di ammoniaca, che consente di determinare numerose proprietà della sorgente, quali temperatura, densità molecolare e struttura cinematica. L'approccio matematico consiste in un fit non lineare degli spettri a disposizione. Accanto a questi dati sono stati utilizzati i dati del telescopio Herschel per caratterizzare l'emissione della polvere presente nel gas, al fine di determinare le mappe di temperatura della

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27

JUNG, JANGWOOK PHILIP. "Computer Simulation of Transport of Small Molecules Through a Gas Channel Embedded in a Phospholipid Bilayer." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1131054184.

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28

Najafian, Ahmad. "Activation of Small Molecules by Transition Metal Complexes via Computational Methods." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703353/.

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The first study project is based on modeling Earth abundant 3d transition-metal methoxide complexes with potentially redox-noninnocent ligands for methane C–H bond activation to form methanol (LnM-OMe + CH4 → LnM–Me + CH3OH). Three types of complex consisting of tridentate pincer terpyridine-like ligands, and different first-row transition metals (M = Ti, V, Cr, Mn, Fe, Co, Ni, and Cu) were modeled to elucidate the reaction mechanism as well as the effect of the metal identity on the thermodynamics and kinetics of a methane activation reaction. The calculations showed that the d electron count

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29

Fullagar, Wilfred Kelsham, and w_fullagar@hotmail com. "Molecular Fullerides." The Australian National University. Research School of Chemistry, 1997. http://thesis.anu.edu.au./public/adt-ANU20010831.150750.

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The closed shell structures of certain all-carbon fragments originally observed in mass spectroscopy experiments leads to the enhanced stability of these species, known as fullerenes, which have excited sufficient interest amongst chemists and physicists over the last decade to warrant the award of the 1996 Nobel Prize for Chemistry to their discoverers. ¶ Studies of the stability, symmetry, and consequent remarkable properties of fullerenes began in earnest in 1991 with the development of a technique enabling the production and purification of macroscopic quantities of material. The best kno

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30

Booth, Nicholas Adrian. "Structure determination by photoelectron diffraction of small molecules on surfaces." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340100.

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31

Rudnick, Paul Anthony. "Studies on the regulatory mechanisms controlling nitrogenase synthesis and ammonia assimilation in Azotobacter vinelandiiand Sinorhizobium meliloti." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279942.

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Biological nitrogen fixation (BNF) is the nitrogenase-catalyzed conversion of dinitrogen to ammonia by a select group of Bacteria and Archaea called diazotrophs. In turn, plants and other microbes assimilate ammonia during the synthesis of nucleic acids, proteins and other biomolecules. BNF is of special interest in agriculture where it replenishes soil nitrogen lost during repetitive farming. Basic knowledge of BNF might eventually lead to less dependence on expensive and polluting chemical fertilizers. For the studies presented here, two model diazotrophs, the free-living Azotobacter vinelan

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32

Billingsley, Daniel D. "Feasibility study of III-nitride-based transistors grown by ammonia-based metal-organic molecular beam epitaxy." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34859.

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III-nitrides are a promising material system with unique material properties, which allows them to be utilized in a variety of semiconductor devices. III-nitrides grown by NH3-MOMBE are typically grown with high carbon levels (> 1021 cm-3) as a result of the incomplete surface pyrolysis of the metal-organic sources. Recent research has involved the compensating nature of carbon in III-nitrides to produce semi-insulating films, which can provide low-leakage buffer layers in transistor devices. The aim of this work is to investigate the possibility of forming a 2DEG, which utilizes the highly

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33

Crispim, Marcell. "Caracterização bioquímica e molecular da glutamina sintetase de Trypanosoma cruzi." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/42/42135/tde-04062014-124916/.

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Trypanosoma cruzi, utiliza os aminoácidos como importantes metabólitos para sua manutenção e viabilidade, dentre eles glutamato e glutamina que participam no suprimento energético, metaciclogênese e síntese de pirimidinas. Neste trabalho a glutamina sintetase de T. cruzi (TcGS) foi estudada sob a hipótese de contribuir com a detoxificação de NH4+. Extratos de T. cruzi e a enzima recombinante pura foram utilizados na caracterização cinética e determinação da conformação oligomérica. Na forma amastigotas, observamos que TcGS é mais expressa e ativa. Além disso, a metionina sulfoximina (MS) inibi

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34

Lasry, Philippe. "Asymmetric synthesis of amino acid derivatives as molecular probes for the mechanism of 3-methylaspsartate ammonia-lyase." Thesis, University of St Andrews, 1998. http://hdl.handle.net/10023/15430.

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3-Methylaspartate ammonia-lyase is a bacterial enzyme that catalyses the reversible elimination of ammonia, in the presence of monovalent and divalent metal ions, from (2S,3S)-3-methylaspartic acid to yield mesaconic acid. The catalytic mechanism of the wild type enzyme obtained from Clostridium tetanomorphum involves a concerted elimination of ammonia and is thought to operate via the intermediacy of a dehydroalanine residue at the active site. No direct evidence has been established so far concerning the existence of this dehydroalanine residue, except that 3-methylaspartate ammonia-lyase wa

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35

Hijazi, Mohamad. "Capteur de gaz SnO2 fonctionnalisé fonctionnant à température ambiante, sensible et sélectif pour la détection d’ammoniac." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEM030/document.

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Dans le domaine de la santé, l’analyse de l'haleine expirée offre un outil simple et non invasif pour le diagnostic précoce des maladies. Les capteurs de gaz à base de SnO2 modifies semblent être des dispositifs prometteurs pour détecter les gaz polaires tels que l'ammoniac. Dans cette étude, la fonctionnalisation de la surface de SnO2 a été réalisée afin d'obtenir un capteur de gaz sensible et sélectif à l'ammoniac, qui fonctionne à température ambiante. La première étape de la fonctionnalisation est la fixation covalente d’un film de 3-aminopropyltrethoxysalane (APTES) sur SnO2 en phase vape

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36

Borgerding, Erika Michelle. "Synthesis, Molecular Weight Characterization and Structure-Property Relationships of Ammonium Ionenes." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35613.

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Ammonium ionenes are macromolecules with quaternized nitrogen groups in the main chain. Ionenes are commonly referred to as x,y-ionene, where x and y represent the number of methylene groups between quaternized nitrogens. Synthesis of aliphatic ammonium ionenes has been studied since the early twentieth centuryÍ¾ however, absolute molecular weight characterization has only been performed using extensive light scattering and viscosity experiments. Performing aqueous size exclusion chromatography (SEC) on ammonium ionenes provides absolute molecular weight determinations while eliminating the

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37

Mukherjee, Maitreyee. "Identification, enumeration, and diversity of ammonia-oxidizing archaea in the Laurentian Great Lakes." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1368022892.

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White, Colin P. "Molecular Microbial Ecology and Operational Evaluation of a Full-scale and Pilot-scale Biologically Active Filter for Drinking Water Treatment." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1277154047.

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Gaudillat, Pierre. "Développement de capteurs conductimétriques pour le suivi de l'ammoniac en atmosphère humide." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS035.

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L’objectif de cette étude était d’obtenir un capteur à bas coût, fonctionnant à température ambiante, et permettant d’obtenir une information sur la concentration d’ammoniac d’une atmosphère, sans tenir compte de l’humidité. Cela implique une très faible sensibilité à l’humidité et une faible synergie entre l’eau et l’ammoniac.Au terme d’une étude sur la mise en forme de films hybrides hydrophiles, par un procédé « propre » dans l’eau, un capteur a été développé, par un assemblage en couche par couche de polyélectrolytes hydrophiles, la polyaniline et la phtalocyanine tétrasulfonée de cuivre :

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40

Amano, Teruki. "A molecular ecological study on anaerobic ammonium oxidizing (anammox) bacteria in coastal sediment." Kyoto University, 2011. http://hdl.handle.net/2433/142330.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第16132号<br>農博第1868号<br>新制||農||990(附属図書館)<br>学位論文||H23||N4602(農学部図書室)<br>28711<br>京都大学大学院農学研究科応用生物科学専攻<br>(主査)教授左子芳彦, 教授藤原建紀, 教授澤山茂樹<br>学位規則第4条第1項該当

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Ray, Anirban. "Identification, Enumeration and Diversity of Nitrifying Bacteria in the Laurentian Great Lakes." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1351276518.

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42

Tancharakorn, Somchai. "Instrumentation development for studies of magnetic and structural properties of molecular magnets." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/9781.

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Tetramethyl ammonium manganese trichloride ([CH3)4N][Mn(II)Cl3]) known as TMMC, has been one of the most interesting systems in experimental magnetism due to its highly one-dimensional magnetic Heisenberg behaviour. The focus of this research programme was to study its magnetic and structural properties as a function of pressure. TMMC crystals were prepared by slow evaporation technique at room temperature; however it quickly became apparent that the material is only weakly magnetic and requires a pressure cell with a very low background. This discovery lead to the programme of instrumentation

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43

Calvó, Perxas Laia. "A study on the phylogeny and the ecology of ammonia-oxidizing bacteria using a new molecular marker based on the gene amoB." Doctoral thesis, Universitat de Girona, 2005. http://hdl.handle.net/10803/7866.

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L'agricultura i la industrialització han causat un augment significatiu del nombre d'ambients rics en amoni. La presència de compostos nitrogenats redueix la qualitat de l'aigua, causant problemes de toxicitat, deteriorant el medi ambient i fins i tot afectant la salut humana. En conseqüència, la nitrificació s'ha convertit en un procés global que afecta al cicle del nitrogen a la biosfera. Els bacteris oxidadors d'amoni (AOB) són els responsables de l'oxidació de l'amoni a nitrit, i juguen un paper essencial en el cicle del nitrogen.<br/>Els primers oxidadors d'amoni foren aïllats a finals de

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Tamami, Mana. "Synthesis and characterization of ammonium ionenes containing hydrogen bonding functionalities." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19234.

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Ammonium ionenes are polycations that have quaternary nitrogens in their macromolecular backbone and are synthesized via step-growth polymerization technique. They offer interesting coulombic properties, and the synthetic design provides control over charge density. Non-covalent interactions including nucleobase hydrogen bonding and electrostatics were studied in ammonium ionenes. The non-covalent interactions are expected to increase the effective molecular weight of polymeric precursors and induce microphase separation due to intermolecular associations. The influence of non-covalent interac

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Odendal, James Arthur. "Investigating intermolecular interactions motifs in ammonium carboxylate salts." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2965.

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Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: This thesis reports an in-depth investigation of the intermolecular interaction motifs in secondary, primary and ammonium carboxylate salts. The investigation was conducted using the Cambridge Structural Database (CSD), together with a systematic steric-specific experimental study. The tendency in the literature has been to analyse organic salt crystal structures in terms of hydrogen bonding patterns, almost ignoring cation-anion interactions. This study focuses on the cation-anion inter

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Sizun, Thibaut. "Effet de l'humidité sur la réponse à l'ammoniac de capteurs conductimétriques à base de matériaux moléculaires." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00783853.

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De nombreux capteurs d'ammoniac existent, mais la prise en compte de l'effet de l'humidité sur la mesure capteur est rarement assurée, y compris chez les fabricants. L'objectif de cette thèse est de proposer un transducteur conductimétrique capable de mesurer le taux d'ammoniac de façon sélective, avec une précision suffisante, pour une application au contrôle de la qualité de l'air dans un environnement à taux d'humidité variable. Le moyen employé pour atteindre cet objectif est l'utilisation de résistors à base de phtalocyanines de cobalt, sous forme de films minces, comme matériaux semi-con

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Abee, Mark Winfield. "Interaction of Acid/Base Probe Molecules with Specific Features on Well-Defined Metal Oxide Single-Crystal Surfaces." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29011.

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Acid/Base characterizations of metal oxide surfaces are often used to explain their catalytic behavior. However, the vast majority of these studies have been performed on powders or supported oxides, and there is very little information available in the literature on the interaction of acid/base probe molecules with well-defined oxide surfaces of known coordination geometry and oxidation state. The well-defined, single crystal surfaces of Cu<sub>2</sub>O (111), SnO<sub>2</sub> (110), and Cr<sub>2</sub>O<sub>3</sub> (10<u>1</u>2) were investigated for their acid/base properties by the interac

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Rist, Claire. "Excitation rotationnelle de l'ammoniac interstellaire : problèmes théoriques et perspectives." Grenoble 1, 1991. http://www.theses.fr/1991GRE10072.

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L'interpretation des raies d'emission radio de l'ammoniac interstellaire necessite la connaissance de ses taux d'excitation rotationnelle par collision avec l'hydrogene moleculaire ou l'helium a basse temperature. Les calculs existants ne rendent pas compte des mesures d'excitation en laboratoire. Nous calculons la collision avec l'helium, et nous discutons l'effet des incertitudes sur la surface de potentiel. Nous predisons algebriquement les memes regles de propensite pour l'helium et l'hydrogene (para ou ortho). Nous concluons que le couplage vibronique avec l'inversion de l'ammoniac pourra

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Stanke, Rüdiger. "LeAMT1 ; 2, a molecular target to investigate ammonium transport in tomato roots and N-supply by diazotrophic bacteria." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960055843.

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Sedlacek, Christopher James. "The Ecophysiology of Nitrosomonas sp. Is79." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1437695996.

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