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Dissertations / Theses on the topic 'Ion nitrat'

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Published: 3 June 2025
Last updated: 31 July 2025

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1

Vega, Riquelme Carmen Paulina. "Nitrate stable isotopes and major ions in snow and ice from Svalbard." Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-221780.

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Increasing atmospheric reactive nitrogen (Nr), as consequence of human activities, has generated accumulation of nitrate (NO3-) in Arctic regions. The Arctic has fragile nitrogen limited ecosystems that can be altered by increases of dry or wet deposition of Nr. Ice cores have shown increments of twofold in nitrogen deposition over Greenland and Svalbard during the 20th century. Ice core NO3- stable isotopes, (δ15N-NO3- and δ18O-NO3-), have the potential to serve as proxy of nitrogen oxides (NOx) sources and atmospheric oxidation pathways. NO3- is difficult to interpret in ice since it has sev
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2

Gamboa, Juan Claudio Mancilla. "Fabricação de sensores eletroquímicos para a determinação de espécies químicas de relevância ambiental." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-18082011-141833/.

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Neste trabalho são apresentados resultados relacionados à determinação de nitrato, nitrito e amônio por técnicas eletroquímicas. Para a determinação de nitrato foi utilizada uma lâmina de cobre cuja superfície é renovada continuamente empregando um processo de ativação (oxidação do cobre e subseqüente redução de íons Cu(II)) com potencial controlado em sistema FIA. As condições ótimas foram alcançadas por meio de 60 s para a etapa de ativação, vazão do transportador 3,0 mL min-1 e volume de amostra 150 µL. A repetibilidade foi estimada em 4,7% (n=9) com freqüência de amostragem de 60 amos
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3

Andrade, Flávio Vargas. "Redução de íons nitrato em eletrodos de paládio suportados em carbono." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-11052007-093041/.

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A eletroredução de íons nitrato foi estudada em eletrodos de Paládio suportados em carbono, preparados através de ultra-som, com diferentes tamanhos de partículas. Para tanto, foi necessária a caracterização do catalisador de Pd/C através de DR-X, MET, EDX. Após a caracterização dos catalisadores, preparou-se os eletrodos através de pintura dos catalisadores em tecido de carbono que foram caracterizados por voltametria cíclica. Os estudos de redução de íon nitrato foram realizados utilizando a técnica de DEMS. Foi realizada a normalização dos eletrodos através da porcentagem de paládio obtida
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4

Frampton, Nicholas Charles. "Nitrate selective electrodes containing immobilised ion exchangers." Thesis, University of Plymouth, 1992. http://hdl.handle.net/10026.1/2033.

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A range of ion selective electrodes (ISEs) for the determination of nitrate has been produced using polymeric membranes containing immobilised quaternary ammonium salts as the ion exchanger. The use of the conventional solvent casting technique gave rise to a relatively low cross-link density, two sided response and poor thickness control. The development of a hot pressing technique resolved all the se problems and would readily suit large scale manufacturing. In this work poly(acrylonitrilebutadiene)(NBr) was selected as the membrane matrix and was robust, gave enhanced selectivity coefficien
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5

Aouina, Nizar. "Réduction électrochimique des ions nitrate et nitrite sur électrode de cuivre, en milieu neutre: Apport à la compréhension du mécanisme réactionnel." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00462788.

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Au cours de ce travail, le mécanisme réactionnel de réduction des ions nitrate à une électrode de cuivre en milieu neutre a été étudié et comparé aux résultats obtenus en milieux acide et alcalin. Pour ce faire, des études avec un des intermédiaires réactionnels, les nitrites, ont également été menées. En présence d'ions nitrate, trois vagues de réduction apparaissent sur le voltampérogramme vers -0,9, -1,2 et -1,3 V/ECS. Des mesures avec une électrode tournante nous ont permis de déterminer le nombre d'électrons échangés pour chaque vague, à savoir 2 (nitrites), 6 (hydroxylamine) et 8 (ammoni
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6

Aouina, Nizar. "Réduction électrochimique des ions nitrate et nitrite sur électrode de cuivre, en milieu neutre : apport à la compréhension du mécanisme réactionnel." Paris 6, 2009. http://www.theses.fr/2009PA066323.

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Au cours de ce travail, le mécanisme réactionnel de réduction des ions nitrate à une électrode de cuivre en milieu neutre a été étudié et comparé aux résultats obtenus en milieux acide et alcalin. Pour ce faire, des études avec un des intermédiaires réactionnels, les nitrites, ont également été menées. En présence d’ions nitrate, trois vagues de réduction apparaissent sur le voltampérogramme vers -0,9, -1,2 et -1,3 V/ECS. Des mesures avec une électrode tournante nous ont permis de déterminer le nombre d’électrons échangés pour chaque vague, à savoir 2 (nitrites), 6 (hydroxylamine) et 8 (ammoni
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7

Machado, Franck. "Reactions photochimiques induites sur les composes phenoliques par excitation des ions nitrate et nitrite en solution aqueuse." Clermont-Ferrand 2, 1994. http://www.theses.fr/1994CLF21610.

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L'excitation photochimique des ions nitrite et nitrate en presence de composes phenoliques peut induire des oxydations, des nitrations et des nitrosations. Les reactions d'oxydation se produisent quel que soit le substituant et peuvent etre attribuees aux radicaux hydroxyle formes lors de la photolyse des ions. Les reactions de nitration et de nitrosation sont defavorisees par les substituants electro-attracteurs. Quand les ions nitrite sont excites en presence de phenol ou de resorcinol, une nitrosation en para est observee, qui peut etre attribuee aux oxydes d'azote formes lors de la photoly
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8

Tian, Wei. "Reaction of 3-deoxyhexosulose with nitrite ion." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254663.

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9

Jones, Konnor. "Temperature and Electric Field Dependency of Asymmetric Stretching of Nitrate and Carbonate Ions." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2804.

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Photolysis of nitrate ion in the natural environment produces NO, NO2, and O3, releasing these toxic gases into the atmosphere. Work done by other groups has shown ionic strength dependence of the ratio of products from photolysis of aqueous nitrate ion. To better understand the kinetic mechanisms of nitrate photolysis, the effects that ionic strength in solution have on nitrate ion symmetry breaking are needed. Different solvation environments induce nitrate bonding motifs that may be correlated to the product ratio. Fourier-transform infrared spectra of aqueous nitrate–ion solutions were obt
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10

Ebrahimi, Shelir. "Nitrate removal from drinking water using combined ion exchange/ resin bioregeneration." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55631.

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Nitrate contamination is a drinking water concern in many areas in the world, especially rural communities. Excess nitrate can cause several environmental and health problems. The maximum acceptable concentration of nitrate in drinking water is set to be 45 mg /L as nitrate by USEPA. One of the most common methods for nitrate removal from water is ion exchange using nitrate selective resins. Although these resins have a great capacity for nitrate removal, they are considered non regenerable. The ability to regenerate these resins multiple times will increase the environmental and economic sust
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11

Soropogui, Koïkoï. "Mise au point de capteurs économiques pour la détermination électroanalytique des ions nitrate ou nitrite dans les eaux naturelles." Lyon 1, 2007. http://www.theses.fr/2007LYO10268.

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Les ions nitrate et les ions nitrite sont des composés chimiques présents naturellement dans l'environnement. Normalement leur taux dans les eaux superficielles et dans les eaux souterraines est faible. Il peut cependant atteindre des niveaux élevés suite à certaines activités humaines et représenter un risque sanitaire et environnemental. La mise au point de moyens peu coûteux permettant de surveiller le taux des ions nitrate et nitrite dans les eaux de surface est une nécessité pour la préservation de l'environnement et de la santé humaine. Face à cette nécessité nous nous sommes intéressés
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12

Danielsson, Carl-Ola. "Electropermutation assisted by ion-exchange textile : removal of nitrate from drinking water." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3992.

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13

Björne, Håkan. "The nitrite ion : its role in vasoregulation and host defenses /." Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-534-8/.

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14

Dicks, Andrew P. "Mechanistic studies of copper and thiolate ion induced S-nitrosothiol decompositions." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4703/.

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A detailed study concerning the aqueous decomposition characteristics of S-nitrosothiols in both the presence and absence of cupric ions was undertaken. Spectrophotometric measurements established that the true catalytic species generating nitric oxide from S-nitrosothiols is Cu(^+), formed by the reduction of copper(II) ions by thiolate, which is present as an impurity in solution. Introduction of the specific cuprous ion chelator neocuproine inhibited reaction, with the concentration of thiol in situ having a significant influence on the absorbance/time traces obtained. Under certain conditi
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15

PEREIRA, WALTER. "Transformacao de sulfato de torio em nitrato de torio por resina de troca ionica." reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10266.

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Made available in DSpace on 2014-10-09T12:36:42Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:08Z (GMT). No. of bitstreams: 1 04228.pdf: 1369368 bytes, checksum: 9359a42d983a5041a2b1e9d46808ee7d (MD5)<br>Dissertacao (Mestrado) - IPEN<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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16

Zhang, Yanping. "Nitric oxide decomposition over metal ion-modified Cu-ZSM-5 catalysts." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11260.

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17

Savina, Laura Vanesa. "Validación e incertidumbre del método normalizado para ion nitrito en agua." Bachelor's thesis, Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias, 2017. http://bdigital.uncu.edu.ar/9888.

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El ion nitrito es una sustancia inorgánica que puede estar presente de forma natural o por contaminación en aguas destinadas al consumo humano. Es potencialmente peligroso para la salud, afectando fundamentalmente a los lactantes. El Código Alimentario Argentino, establece como límite máximo la concentración de 1 mg/L-1 NO2-, para no causar efecto nocivo sobre el hombre. El presente trabajo tiene especial interés en la validación y estimación de la incertidumbre relacionada a la técnica analítica, para la determinación de su concentración y así obtener resultados confiables para su fiscalizaci
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18

Mönnich, Ingrid. "Präparation und Charakterisierung von geträgerten Bimetallkatalysatoren zur katalytischen Nitratreduktion." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96094155X.

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19

Sinharoy, Pritam. "Cross Talk Between TRPA1 and TRPV1 Ion-Channels: Role of Nitric Oxide." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1467381679.

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20

Leleu, Olivier. "Étude du métabolisme azoté du colza : régulation de l'activité nitrate réductase en fonction du développement et des sources azotées." Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-306.pdf.

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L'etude d'un cycle complet de developpement chez le colza a montre qu'il existait un fort potentiel de reduction du nitrate au moment de la reprise de la croissance au printemps. Au moment de l'initiation de la floraison, la reduction du nitrate se delocalise des feuilles vers les tiges et enfin vers les siliques. Une telle capacite des siliques a reduire le nitrate constitue une originalite. Par ailleurs, nous avons mis en evidence que la dynamique de la biomasse foliaire, croissance et senescence, est un facteur cle de l'efficacite d'utilisation de l'azote (leleu et al. 2000, plant biology a
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21

Van, der Meulen Nicholas. "Ion exchange behaviour of 42 selected elements on AG MP-50 cation exchange resin in nitric acid and citric acid mixtures." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16452.

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Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: The equilibrium distribution coefficients of 42 elements [Li(I), Na(I), K(I), Rb(I), Cs(I), Sc(III), Ti(IV), V(IV), V(V), Mn(II), Fe(III), Ni(II), Zn(II), Al(III), Ga(III), As(V), Y(III), Zr(IV), Nb(V), Mo(VI), Cd(II), In(III), Sn(IV), Sb(V), Ta(V), W(VI), Pb(II), Bi(III), La(III), Ce(III), Th(IV), U(VI), Co(II), Ag(I), Ge(IV),Mg(II), Sr(II), Ba(II), Tb(III), Yb(III), Cr(III) and Cu(II)] on Bio Rad AG MP-50 macroporous cation exchange resin in varying citric acid – nitric acid mixtures were successfully determined. The
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22

Marote, Pedro. "Étude du rôle des sels précurseurs de métaux di et tétravalents et des ions alcalins, dans la synthèse d'oxydes en milieu nitrate et nitrite fondu." Lyon 1, 2001. http://www.theses.fr/2001LYO10161.

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La réaction des nitrates et chlorures de Ni, Cu et Zn avec les nitrates et nitrites alcalins fondus a été suivie par ATG. Chaque oxyde obtenu a fait l'objet de diverses caractérisations pour mettre en évidence le rôle des constituants du système réactionnel, en particulier celui des ions ne participant pas directement à la réaction. En milieu nitrite, le plus basique, la réaction est complète, très rapide et se déroule en phase solide. En milieu nitrate, elle est plus lente, permettant une déshydratation du précurseur, a lieu à de plus hautes températures, et est parfois incomplète. Les nitrat
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23

Rendon, Julia. "Etudes structurales et fonctionnelles de la nitrate réductase A par spectroscopie RPE à haute résolution." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4753.

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Mon objectif a consisté à élucider à l'échelle moléculaire le fonctionnement des systèmes enzymatiques complexes impliqués dans des processus de conversion d'énergie chez les êtres vivants. Je m'intéresse en particulier à la compréhension de deux étapes clés du fonctionnement commun à un grand nombre de ces systèmes, à savoir (i) les étapes d'interaction de ces complexes avec les quinones membranaires et (ii) les mécanismes catalytiques au niveau des sites actifs à molybdène. Le système modèle que j'étudie est la nitrate réductase A issue de la bactérie E. coli, en collaboration avec l'équipe
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24

Dias, Jailson Cardoso. "Determinação de acetato, nitrato, ferro(II), ferro(III) e cobre em etanol combustivel por cromatografia de ions." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248380.

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Orientador: Lauro Tatsuo Kubota<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-15T10:20:51Z (GMT). No. of bitstreams: 1 Dias_JailsonCardoso_D.pdf: 1120921 bytes, checksum: 080b276b57f19a203109def137925235 (MD5) Previous issue date: 2010<br>Resumo: O contexto geral deste trabalho se insere na área de desenvolvimento de métodos analíticos para a separação cromatográfica e detecção de íons em biocombustíveis. Diversos procedimentos de otimização (uni e multivariada) foram executados inicialmente visando estabelecer as melhore
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25

Liu, Xiaodong. "MODULATION OF SIGNAL PROCESSING BY ION CHANNELS IN ROD PHOTORECEPTORS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1094140880.

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26

Loef, Irere. "Auswirkungen von Nitrat auf die Blühinduktion von Arabidopsis thaliana (L.) Heyn /." Heidelberg : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967875919.

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27

Guarilloff, Philippe. "Guidelines for the nitrate selectivity from ion-exchange resins having a quaternary ammonium group as a binding site /." Title page, table of contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phg915.pdf.

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28

Tan, Lea. "Anaerobic treatment of mine wastewater for the removal of selenate and its co-contaminants." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1103.

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Cette recherche visait à aborder l’effet des caractéristiques des eaux usées (c’est-à-dire les Co-contaminants, métaux lourds et pH) sur la réduction biologique du Séléniate (SeO42-), et évaluer l'intégration des processus et des configurations pour le traitement des eaux usées chargé de sélénium et de Co-contaminants.La première partie de l’étude portait sur l’effet des accepteurs de Co-électrons et le faible pH sur la bioremédiation du SeO42-, les études expérimentales a montré que le rapport molaire NO3- et SO42- à SeO42- a un facteur de contrôle en augmentant ou en diminuant l'efficacité d
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29

Brechlin, Peter. "Untersuchungen zu Nitrat-induzierbaren Proteinen der Plasmamembran von Chlorella saccharophila (Krüger) Nadson." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966254104.

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30

Zahidi, Assou. "Etudes structurales et dynamiques de complexes macrocycliques par rmn heteronucleaire." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13171.

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Etude de la complexation de cations et d'anions par des ligands synthetiques a l'aide de la rmn heteronucleaire (**(6)li, **(7)li, **(13)c, **(14)n, **(15)n, **(19)f, **(31)p, **(35)cl et **(109)ag) et de mesures d'effet overhauser homo- et heteronuclaires
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31

Meng, Yiyu. "Nitrite oxidising bacteria in soil : examination of the interactions with ammonia oxidisers and the influence of pH on their diversity and distribution." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231853.

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Nitrification is a central part of the nitrogen cycle, whereby the most reduced form, ammonia, is converted to the most oxidised form, nitrate via nitrite. The first step is performed by ammonia oxidising bacteria (AOB) and archaea (AOA), with the second step performed by nitrite oxidising bacteria (NOB). Although both groups are closely associated in nature, ammonia oxidisers have received more attention compared to NOB as ammonia oxidation is considered the rate-limiting step. Nitrobacter and Nitrospira are two important groups of soil NOB. To determine whether there are specific association
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32

Salvador, Conan Ayade. "Desenvolvimento e avaliação de um sistema de controle de nitrato em soluções nutritivas." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/11/11143/tde-13022014-083519/.

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O crescimento populacional e a consequente demanda adicional de alimentos exigem uma agricultura cada vez mais intensa e tecnificada. Essa conjuntura tem contribuído para se buscar a maximização do rendimento das culturas, além da otimização do uso de recursos, em especial, fertilizantes e água. Nos sistemas que aplicam a fertirrigação, como é o caso do cultivo hidropônico, realizam-se o manejo químico da solução nutritiva mediante monitoramento da concentração salina com condutivímetro portátil. Essa prática comum entre os produtores pode ocasionar desequilíbrios nutricionais, tendo em vista
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33

Rudolph, Wolfram W., and Gert Irmer. "Hydration and ion pair formation in common aqueous La(III) salt solutions: a Raman scattering and DFT study." Royal Society of Chemistry, 2015. https://tud.qucosa.de/id/qucosa%3A36118.

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Raman spectra of aqueous lanthanum perchlorate, triflate (trifluorosulfonate), chloride and nitrate solutions were measured over a broad concentration (0.121–3.050 mol Lˉ¹) range at room temperature (23 °C). A very weak mode at 343 cmˉ¹ with a full width at half height at 49 cmˉ¹ in the isotropic spectrum suggests that the nona-aqua La(III) ion is thermodynamically stable in dilute perchlorate solutions (∼0.2 mol Lˉ¹) while in concentrated perchlorate solutions outer-sphere ion pairs and contact ion pairs are formed. The La³⁺ nona-hydrate was also detected in a 1.2 mol Lˉ¹ La(CF₃SO₃)₃(aq). In
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34

Wilson, Gary William. "Hyperpolarisation-activated ion channels as a target for nitric oxide-cGMP signalling in the rat brain." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445186/.

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Most of the known physiological effects of nitric oxide (NO) in the brain are mediated by activation of specialised guanylyl cyclase-coupled receptors, leading to a rise in intracellular cGMP. Apart from protein kinase activation little is known about subsequent cGMP signal transduction. In optic nerve axons, hyperpolarisation-activated cyclic nucleotide-gated (HCN) channels, which bind cGMP (and cAMP) directly, appear to be a target. The objective was to test this possibility directly using electrophysiological methods. Studies were initially carried out by recording extracellularly from Scha
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35

Davey, Cara-Lee. "Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars." The University of Waikato, 2008. http://hdl.handle.net/10289/2407.

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The large scale nitric acid oxidation of common sugars into their corresponding aldaric acids is being investigated as an important source of potentially useful components for industrial applications such as polymers. This thesis details the development of an Ion Chromatography (IC) method for the analysis of these oxidation mixtures and related samples from the work-up and purification processes. The method was developed for use with a Dionex ICS2000 IC system equipped with an AS11-HC column and utilising suppressed conductivity detection. IC proved to be a useful, versatile and straightforwa
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36

Goldman, Aaron. "The Role of Bile Acids in the Progression of Squamous Epithelium to Barrett's Esophagus and Esophageal Adenocarcinoma." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195890.

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Barrett's esophagus (BE) is a premalignant disease associated with esophageal adenocarcinoma (EAC). This condition is highly associated with gastroesophageal reflux disease (GERD) which is characterized as chronic exposure of the esophagus to acid and bile acids. An understanding of the cytotoxic and tumorigenic capacity of bile acids and acid during a reflux episode will lead to the identification of markers for therapeutic intervention. The major goal of the following studies was to determine the mechanisms responsible for bile acid-induced alteration in intracellular pH (pHi) the effect on
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37

Li, Xiaoji. "Understanding Liquid-Air Interface Corrosion of Steel in Simplified Liquid Nuclear Waste Solutions." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365506823.

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38

Bernhold, Maria-Theresia. "Einfluss von Klima und anbautechnischen Massnahmen auf Gehalt und Verteilung von Nitrat in Möhren." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969347952.

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39

Moore, Keara Bevin. "Nitrate source history for Livermore, California using environmental isotopes, noble-gases, and major ions." Thesis, The University of Arizona, 2004. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0118_sip1_w.pdf&type=application/pdf.

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40

Paugam, Lydie. "Contribution à l'étude de l'élimination des ions nitrates par nanofiltration." Rennes 1, 2002. http://www.theses.fr/2002REN10074.

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En Bretagne particulièrement, les teneurs en nitrates dans la ressource en eau ont atteint un niveau très préoccupant et dépassent trop souvent la norme admise. Pour la distribution d'une eau de qualité, il s'avère indispensable d'éliminer cette pollution de façon immédiate. La nanofiltration est un procédé membranaire dont nous avons voulu étudier le potentiel en tant qu'alternative aux méthodes de traitement conventionnelles. Le travail expérimental s'est divisé en deux parties. Dans la première nous avons mis en évidence l'influence de la nature de l'eau à traiter sur l'efficacité de l'élim
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41

Fette, Achim. "Die Wirkung organischer Nitrate auf den Tonus isolierter Zerebralgefässe." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961994479.

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42

Stepien, Christelle. "Etude de réactions ion-molécule impliquées dans la détection stratosphérique du nitrate de chlore par spectrométrie de masse à ionisation chimique." Orléans, 2001. http://www.theses.fr/2001ORLE2059.

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Les espèces minoritaires stratosphériques peuvent être mesurées in-situ par spectrométrie de masse à ionisation chimique. Cette méthode employée par l'instrument MACSIMS (Measurement of atmospheric constituents by selective ion mass spectrometry) consiste à faire réagir des espèces minoritaires avec des ions générés dans la source de l'instrument. Les ions spécifiques produits sont détectés par spectrométrie de masse. Le projet MACSIMS avait pour objectif de développer une méthode de mesure simultanée de HNO3, CIONO2, HCI et N2O5. Les spectres de vol de MACSIMS ont révélé une chimie ionique pl
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43

Hähnlein, Marc Sascha. "Entwicklung und Charakterisierung von Edelmetallträgerkatalysatoren und Edelmetallnanosolen zur katalytischen Nitrat- und Nitritreduktion sowie zur Sorboseoxidation." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=957832699.

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44

Keränen, A. (Anni). "Water treatment by quaternized lignocellulose." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215143.

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Abstract Water-related problems are increasing globally, and new, low-cost technologies are needed to resolve them. Lignocellulosic waste materials contain reactive functional groups that can be used to provide a bio-based platform for the production of water treatment chemicals. Research on bio-based ion exchange materials in the treatment of real wastewaters is needed. In this thesis, anion exchange materials were prepared through chemical modification (epichlorohydrin, ethylenediamine and triethylamine) using five Finnish lignocellulosic materials as bio-based platforms. Scots pine sawdust
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45

Gotschke, Tobias. "Untersuchungen zum geordneten Wachstum von III-Nitrid Nanodrähten." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://dx.doi.org/10.18452/16466.

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Diese Arbeit behandelt den Einfluss der Mg- und Si-Dotierung auf das Wachstum von InN-Nanodrähten (ND) sowie die Etablierung, Anwendung und Analyse des selektiven Wachstums von GaN-ND auf Si-Substraten. Das Ziel der Arbeit ist dabei die Herstellung von ND mit homogenen Abständen, Durchmessern und Längen. Zunächst wird die Si- und Mg-Dotierung von InN-ND untersucht. Dazu werden die einzelnen Wachstumsparameter variiert und deren Einfluss analysiert. Für die Si-Dotierung kann dabei eine nicht lineare Abhängigkeit der Morphologie der Nanodrähte mit der Substrattemperatur, dem In- und Si-Fluss b
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46

Thyer, Aubrey Maurice. "Chain processes in the Tc(VII)-catalysed oxidation of hydrazine by nitrate and perchlorate ions." Thesis, University of Warwick, 1990. http://wrap.warwick.ac.uk/108024/.

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Studies of the reaction between pertechnetate ion and hydrazine in solutions in several different acids have been carried out In order to establish the reaction mechanism and, where possible, the Individual rate constants of each step. Computer simulation of the experimental data has been utilised to enable the formulation of reaction schemes for these very complex chain reactions. In nitric acid the reaction typically exhibits an Induction period of variable length depending on the acidity and concentrations of nitrate, hydrazine and technetlium. This is followed by a stage of rapid loss of h
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47

Franco, Elenilson Moreira. "Monitoramento da dinâmica da água e solutos em um perfil de solo, sob sistema de fertirrigação por gotejamento, utilizando sonda de capacitância e extratores de solução." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11143/tde-22062009-160129/.

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O princípio básico da irrigação é a reposição ou complementação hídrica necessária visando alcançar a máxima potencialidade fisiológica dos cultivos, buscando maiores produtividades, principalmente mediante uma aplicação racional da quantidade de água. Portanto, o domínio de técnicas que possam ser aplicadas para manejar a aplicação da água e nutrientes via irrigação passa a ter um papel importante em todo esse processo e a obtenção de valores de umidade do solo é fundamental em estudos que envolvem a dinâmica da água, bem como, de solutos no solo, pois indica qual a condição hídrica que o sol
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48

Mabakane, Elizabeth Nontombi. "The determination of distribution coefficient for some elements on the macroporous cation exchanger Amberlyst 15 using nitric acid – methanol mixtures." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2329.

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Thesis (MTech (Chemistry))--Cape Peninsula University of Technology, 2016.<br>The main purpose of this study is to understand the application of ion exchange chromatography on separation of charged ions of elements. Ion exchange chromatography is an analytical method, which is used for the separation of elements, quantitation and qualitation. The use of Amberlyst 15 resin as a source of separation for metal ions has been investigated and studies in various academic disciplines such as chemistry and material science. In this research study, Amberlyst 15 resin was investigated in order
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Ricardo, Ana Rita da Fonseca. "Modelling and optimization of the ion exchange membrane bioreactor for removal of anionic pollutants from drinking water streams." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/7972.

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Dissertação para obtenção do Grau de Doutor em Engenharia Química, especialidade de Engenharia Bioquímica<br>The present work aimed at studying the treatment of drinking water supplies contaminated with perchlorate and nitrate, using the Ion Exchange Membrane Bioreactor (IEMB) concept. This system combines the transport of these two anions from contaminated water, through an anion exchange membrane, with their biological reduction in a separate compartment. In the IEMB, the mass transport is dependent not only from membrane properties but also from the biocompartment conditions. Multivariate
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50

Bouguerra, Maissa. "Étude de l'élimination des ions nitrate dans les effluents agroalimentaires au moyen d'un adsorbant organosilicate mésoporeux." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/26966/26966.pdf.

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