Browsing Institutt for kjemi by Issue Date
Now showing items 41-60 of 1404
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Methyl 5-nitro-2-(phenylamino)pyridine-4-carboxylate
(Journal article; Peer reviewed, 2006)In the crystal structure of the title compound, C13H11N3O4, there are two independent molecules in the asymmetric unit. In each case, the methylcarboxylate group is twisted by about 90 degrees relative to the rest of the ... -
Selenomethionine-catalyzed nickel ion reduction at a mercury electrode: applications in the analysis of nutritional supplements
(Journal article; Peer reviewed, 2006)Selenomethionine (SeMet) is a catalyst for Ni(II) reduction at a mercury electrode in a borax buffer at pH around 9 and gives rise to a differential pulse voltammetric peak, A, at -0.74 V vs. the Ag|AgCl, (3 M KCl) reference ... -
Screening analyses of pinosylvin stilbenes, resin acids and lignans in Norwegian conifers
(Journal article; Peer reviewed, 2006)The content and distribution of stilbenes and resin acids in Scots pine (Pinus sylvestris) and spruce (Picea abies), sampled in central Norway, have been examined. The contents of pinosylvin stilbenes in pine heartwood/living ... -
On exergy analysis and entropy production minimisation in industrial ecology
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:151, Doctoral thesis, 2006)The objective of this thesis is to improve the basis for applying industrial ecology to the evaluation of material and energy resource use and transformation in industrial systems. The underlying hypothesis was that when ... -
Homocysteine Electrochemistry at a Mercury Electrode in the Presence of Nickel Ions
(Chapter, 2007)Hcy gives rise to a series of voltammetric peaks in the presence of Ni2+ and under the conditions of cathodic stripping voltammetry, as follows: A) cathodic reaction of mercury thiolate (with a Ni2+-dependent peak potential); ... -
o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine
(Journal article; Peer reviewed, 2007)2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine (5), has been obtained as a minor product from reactions of S-nucleophiles with 5,6-di(1-bromoethyl)pyrazine-2,3- dicarbonitrile (3), or from a condensation of 4-hydroxy-2 ... -
A framework for significance analysis of gene expression data using dimension reduction methods
(Journal article; Peer reviewed, 2007)Background: The most popular methods for significance analysis on microarray data are well suited to find genes differentially expressed across predefined categories. However, identification of features that correlate ... -
Impedance Diagrams of the Electrodes in the Polymer Electrolyte Membrane Fuel Cell
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:179, Doctoral thesis, 2007)The objective of this thesis was to better understand the electrodes of the polymer electrolyte membrane fuel cell (PEMFC), and especially the anode. We were interested in how CO poisoning affected the fuel cell and therefore ... -
Polyenyl cations and radical cations – synthesis, spectroscopic properties and reactions
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:219, Doctoral thesis, 2007)In the present work, polyene precursors for the formation of charged polyenyl species were synthesised. Their conversion to charge delocalised radical cations and diamagnetic mono- and dications was carried out by treatment ... -
Image segmentation and multivariate analysis in two-dimensional gel electrophoresis
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:200, Doctoral thesis, 2007)The topic of this thesis is data-analysis on images from two-dimensional electrophoretic gels. Because of the complexity of these images, there are numerous steps and approaches to such an analysis, and no “golden standard” ... -
Synthesis of Optically Active Nucleosides, Nucleotides and Oligonucleatide Analogues
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:328, Doctoral thesis, 2008)The main goal of this project was to synthesize various kinds of polynucleotide analogues that contained either 1,3-dioxane or 1,4-dioxane sugar moiety and several optically active nucleoside analogues that containing ... -
A synthesis of atmospheric mercury depletion event chemistry in the atmosphere and snow
(Journal article; Peer reviewed, 2008)It was discovered in 1995 that, during the spring time, unexpectedly low concentrations of gaseous elemental mercury (GEM) occurred in the Arctic air. This was surprising for a pollutant known to have a long residence time ... -
Atmosfærisk kvikksølvspesiering i Ny-Ålesund: Hvor pålitelig er den nåværende metoden?
(Master thesis, 2008)Detekterte maksimumsverdier av RGM og PHg var henholdsvis 38 og 47 pg/m3. Dette var lave konsentrasjoner i forhold til tidligere rapporterte data fra polare områder. Hovedårsaken til de lave konsentrasjonene av RGM og PHg ... -
Enantioselective Synthesis of Homo-N-Nucleosides Containing a 1,4-Dioxane Sugar Analog
(Journal article; Peer reviewed, 2008)A dioxane homo-sugar analog, (2S,5S)-and (2R,5S)-5-[(4S)-2,2-dimethyl-1,3- dioxolan-4-yl]-2-iodomethyl-1,4-dioxane was prepared from (2R,3R)-dimethyl tartrate, and further elaborated into the corresponding homo-N-nucleoside ... -
High resolution inductively coupled plasma mass spectrometry: Some applications in biomedicine
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:109, Doctoral thesis, 2008)Even though trace elements are present at minute amounts in the human body, they have a considerable impact on human health, either as essential elements in biochemical functions indispensable for life, or on the contrary, ... -
Syntese av crocin-derivater
(Master thesis, 2008)Syntese av crocinderivater. Syntese av crocetin, både kjemisk og ved hjelp av mikroorganisme. -
Synthesis of polynucleotide analogs containing a polyvinyl alcohol backbone
(Journal article; Peer reviewed, 2008)Water soluble homo-base polynucleotide analogues were synthesized in which polyvinyl alcohol and partially phosphonated polyvinyl alcohol constituted the backbones, onto which were grafted uracil or adenine via 1,3-dioxane ... -
The Influence of Chemical Composition on Streamer Initiation and Propagation in Dielectric Liquids
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:264, Doctoral thesis, 2008)Effects of electron-attaching and electron-releasing additives in cyclohexane on the initiation and propagation of positive and negative non-breakdown streamers have been studied qualitatively and quantitatively. Fast ... -
Likevekt i læring, læring i likevekt?: En studie av kjemisk likevekt i forhold til undervisning.
(Master thesis, 2008)Kjemisk likevekt i forhold til undervisning er overordnet tema for denne masteroppgaven, og dette har vi sett på fra flere sider. Den første er fra et historisk perspektiv, inkludert temaets plass i eldre norske lærebøker. ...