Now showing items 242-261 of 527

    • Identification and Cross-Characterisation of Artificial Promoters and 5′ Untranslated Regions in Vibrio natriegens 

      Tietze, Lisa; Hoff, Maria Wilhelmsen; Lale, Rahmi (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-27)
      Vibrio natriegens has recently gained attention as a novel fast-growing bacterium in synthetic biology applications. Currently, a limited set of genetic elements optimised for Escherichia coli are used in V. natriegens due to the lack of DNA parts characterised in this novel host. In this study, we report the identification and cross-characterisation of artificial promoters and 5′ untranslated ...
    • The immediate global responses of Aliivibrio salmonicida to iron limitations 

      Thode, Sunniva Katharina; Kahlke, Tim; Robertsen, Espen Mikal; Hansen, Hilde; Haugen, Peik (Journal article; Tidsskriftartikkel, 2015-02-04)
      <i>Background</i>: Iron is an essential micronutrient for all living organisms, and virulence and sequestration of iron in pathogenic bacteria are believed to be correlated. As a defence mechanism, potential hosts therefore keep the level of free iron inside the body to a minimum. In general, iron metabolism is well studied for some bacteria (mostly human or animal pathogens). However, this area ...
    • The impact of interplay between electronic and steric effects on the synthesis and the linear and non-linear optical properties of diketopyrrolopyrrole bearing benzofuran moieties 

      Purc, Anna; Koszarna, Beata; Iachina, Irina; Friese, Daniel Henrik; Tasior, Mariusz; Sobczyk, Krzysztof; Pedzinski, Tomasz; Brewer, Jonathan; Gryko, Daniel T (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-07)
      An in-depth investigation of the reaction of substituted salicylaldehydes with chloroacetonitrile led to the development of new conditions for the synthesis of 2-cyanobenzofurans. The crucial improvement lies in the use of phase-transfer catalysis in the second step, i.e., intramolecular aldol type condensation. In a two-step process, the reactants were transformed into a library of 3,6-bis(ben ...
    • Impacts of climate and emission changes on nitrogen deposition in Europe: A multi-model study 

      Simpson, David; Andersson, Camilla; Christensen, Jesper Heile; Engardt, Magnuz; Geels, Camilla; Nyiri, Agnes; Posch, Maximilian; Soares, Joana B.P.; Sofiev, Mikhail; Wind, Peter; Langner, Joakim (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Implementation of Relativistic Coupled Cluster Theory for Massively Parallel GPU-Accelerated Computing Architectures 

      Pototschnig, Johann V.; Papadopoulos, Anastasios; Lyakh, Dmitry I.; Repisky, Michal; Halbert, Loïc; Gomes, Andre Severo Pereira; Jensen, Hans Jørgen Aa.; Visscher, Lucas (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-09)
      In this paper, we report reimplementation of the core algorithms of relativistic coupled cluster theory aimed at modern heterogeneous high-performance computational infrastructures. The code is designed for parallel execution on many compute nodes with optional GPU coprocessing, accomplished via the new ExaTENSOR back end. The resulting ExaCorr module is primarily intended for calculations of molecules ...
    • Improved Buchwald–Hartwig Amination by the Use of Lipids and Lipid Impurities 

      Gevorgyan, Ashot; Hopmann, Kathrin Helen; Bayer, Annette (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-25)
      The development of green Buchwald–Hartwig aminations has long been considered challenging, due to the high sensitivity of the reaction to the environment. Here we show that food-grade and waste vegetable oils, triglycerides originating from animals, and natural waxes can serve as excellent green solvents for Buchwald–Hartwig amination. We further demonstrate that amphiphiles and trace ingredients ...
    • Improved CRISPR/Cas9 gene editing by fluorescence activated cell sorting of green fluorescence protein tagged protoplasts 

      Petersen, Bent Larsen; Möller, Svenning Rune; Mravec, Jozef; Jørgensen, Bodil; Christensen, Mikkel; Liu, Ying; Wandall, Hans H.; Bennett, Eric Paul; Yang, Zhang (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-17)
      <i>Background</i>: CRISPR/Cas9 is widely used for precise genetic editing in various organisms. CRISPR/Cas9 editing may in many plants be hampered by the presence of complex and high ploidy genomes and inefficient or poorly controlled delivery of the CRISPR/Cas9 components to gamete cells or cells with regenerative potential. Optimized strategies and methods to overcome these challenges are ...
    • Indirect NMR spin-spin coupling constants in diatomic alkali halides 

      Jaszuński, Michał; Antušek, Andrej; Demissie, Taye Beyene; Komorovsky, Stanislav; Repisky, Michal; Ruud, Kenneth (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-28)
      We report the Nuclear Magnetic Resonance (NMR) spin–spin coupling constants for diatomic alkali halides MX, where M = Li, Na, K, Rb, or Cs and X = F, Cl, Br, or I. The coupling constants are determined by supplementing the non-relativistic coupled-cluster singles-and-doubles (CCSD) values with relativistic corrections evaluated at the four-component density-functional theory (DFT) level. These ...
    • Influence of Fluorinated Substituents on the Near-Infrared Phosphorescence of 5d Metallocorroles 

      Johannessen, Krister Engedal; Johansen, Martin Amund Langaas; Einrem, Rune Finsås; McCormick McPherson, Laura J.; Alemayehu, Abraham; Borisov, Sergey M.; Ghosh, Abhik (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-12)
      The influence of fluorinated substituents on the luminescent properties of rhenium-oxo, osmium-nitrido, and gold triarylcorroles was studied via a comparison of four ligands: triphenylcorrole (TPC), tris(ptrifluoromethylphenyl)corrole (TpCF<sub>3</sub>PC), tris{3,5-bis(trifluoromethyl)- phenyl}corrole (T3,5-CF<sub>3</sub>PC), and tris(pentafluorophenyl)corrole (TPFPC). For each metal series ...
    • The influence of sediment properties and experimental variables on the efficiency of electrodialytic removal of metals from sediment 

      Pedersen, Kristine Bondo; Lejon, Tore; Jensen, Pernille E.; Ottosen, Lisbeth M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-16)
      <p>Chemometrics was used to determine the influence of sediment properties and experimental settings for the electrodialytic removal (EDR) of Cu, Pb and Zn from six harbour sediments from Greenland and Norway. A Projection onto latent structures (PLS) model revealed that the most important sediment properties for achieving acidification (lag-phase, pH > 4), necessary for desorbing and mobilising ...
    • Infrared Spectroelectrochemistry of Iron-Nitrosyl Triarylcorroles. Implications for Ligand Noninnocence 

      Rahman, Md. Hafizur; Ryan, Michael D.; Vazquez-Lima, Hugo; Alemayehu, Abraham; Ghosh, Abhik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-13)
      Recent DFT calculations have suggested that iron nitrosyl triarylcorrole complexes have substantial {FeNO}<sup>7</sup> −corrole<sup>•2−</sup> character. With this formulation, reduction of Fe(C)(NO) complexes, where C = triarylcorrole, should be centered on the corrole macrocycle rather than on the {FeNO}<sup>7</sup> moiety. To verify this proposition, visible and infrared spectroelectrochemical ...
    • Inhibition of aurora kinase B is important for biologic activity of the dual inhibitors of BCR-ABL and aurora kinases R763/ AS703569 and PHA-739358 in BCR-ABL transformed cells 

      Illert, Anna L; Seitz, Anna K.; Rummelt, Christoph; Kreutmair, Stefanie; Engh, Richard Alan; Goodstal, Samantha; Peschel, Christian; Duyster, Justus; von Bubnoff, Nikolas (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Initial characterization of an iron superoxide dismutase from Thermobifida fusca 

      Hamre, Anne Grethe; Al-Sadawi, Rim; Johannesen, Kirsti Merete; Bisarro, Bastien; Kjendseth, Åsmund Røhr; Leiros, Hanna-Kirsti S.; Sørlie, Morten (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-19)
      Superoxide dismutases (SODs) are enzymes that catalyze the dismutation of the superoxide radical anion into O<sup>2</sup> and H<sup>2</sup>O<sup>2</sup> in a two-step reaction. They are ubiquitous to all forms of life and four different types of metal centers are detected, dividing this class of enzymes into Cu-/Zn-, Ni-, Mn-, and Fe-SODs. In this study, a superoxide dismutase from the ...
    • Innføring av studentaktive arbeidsformer i seminarundervisningen. Hvilken betydning har dette på læringsutbyttet og klassemiljøet? 

      Netland, Kjell Øystein; Sivertsen, Annfrid; Olufsen, Magne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-08)
      I denne studien ønsket vi å undersøke hvordan innføring av studentaktive læringsformer i seminarundervisningen påvirket det faglige læringsutbyttet og klassemiljøet i STEM-fag (science, technology, engineering and mathematics). Et randomisert kontrollert studie ble gjennomført i seminarundervisningen i to innføringsemner i fysikk og kjemi ved UiT Norges arktiske universitet. I emnene fulgte ...
    • Insight into the fluorescence quenching of Trp214 at HSA by the Dimetridazole ligand from simulation 

      Pomogaev, Valdimir A; Ramazanov, Ruslan R; Ruud, Kenneth; Artyukhov, Victor Ya (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-24)
      Spectroscopy is an important tool for detecting drug binding to amino acid sequences. One such important spectroscopic process is the fluorescence quenching due to charge transfer (CT) processes between a drug molecule and the chromophore center of Human Serum Albumin (HSA). We present a theoretical investigation of the CT occurring upon electronic excitation when a dimetridazole (Dmz) molecule ...
    • Insights into the role of three Endonuclease III enzymes for oxidative stress resistance in the extremely radiation resistant bacterium Deinococcus radiodurans 

      Rollo, Filipe; Martins, Guilherme D.; Gouveia, André G.; Ithurbide, Solenne; Servant, Pascale; Romão, Célia V.; Moe, Elin (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-12)
      The extremely radiation and desiccation resistant bacterium Deinococcus radiodurans possesses three genes encoding Endonuclease III-like enzymes (DrEndoIII1, DrEndoIII2, DrEndoIII3). In vitro enzymatic activity measurements revealed that DrEndoIII2 is the main Endonuclease III in this organism, while DrEndoIII1 and 3 possess unusual and, so far, no detectable EndoIII activity, respectively. In ...
    • Intermolecular charge transfer enhances two-photon absorption in yellow fluorescent protein 

      Beerepoot, Maarten T. P.; Friese, Daniel Henrik; Ruud, Kenneth (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
      We present a quantum chemical study of the two-photon absorption (TPA) properties of yellow fluorescent protein (YFP), a mutant of the extensively studied green fluorescent protein. The aromatic chromophore of YFP has a π-stacking interaction with the aromatic ring of a tyrosine residue (Tyr203) in a parallel-displaced structure with a distance of about 3.4 Å. We study the TPA spectrum of the ...
    • Interplay of twist angle and solvents with two-photon optical channel interference in aryl-substituted BODIPY dyes 

      Alam, MD Mehboob; Misra, Ramprasad; Ruud, Kenneth (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-11)
      Channel interference plays a crucial role in understanding the physics behind multiphoton absorption processes. In this work, we study the role of channel interference and solvent effects on the two-photon absorption in aryl-substituted boron dipyrromethene (BODIPY) dyes, a class of intramolecular charge-transfer (ICT) molecules. For this purpose, we consider fourteen dyes of this class with various ...
    • Interpreting the paramagnetic NMR spectra of potential Ru(III) metallodrugs: synergy between experiment and relativistic DFT calculations 

      Novotný, Jan; Sojka, Martin; Komorovsky, Stanislav; Nečas, Marek; Marek, Radek (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-16)
      Ruthenium-based compounds are potential candidates for use as anticancer metallodrugs. The central ruthenium atom can be in the oxidation state +2 (e.g., RAPTA, RAED) or +3 (e.g., NAMI, KP). In this study we focus on paramagnetic NAMI analogs of a general structure [4-R-pyH]+ <i>trans</i>-[Ru<sup>III</sup>Cl<sub>4</sub>(DMSO)(4-R-py)]<sup>−</sup>, where 4-R-py stands for a 4-substituted pyridine. ...
    • Intrinsic Strand-Incision Activity of Human UNG: Implications for Nick Generation in Immunoglobulin Gene Diversification 

      Alexeeva, Marina; Moen, Marivi Nabong; Xu, Xiang Ming; Rasmussen, Anette; Leiros, Ingar; Kirpekar, Finn; Klungland, Arne; Alsøe, Lene; Nilsen, Hilde; Bjelland, Svein (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-22)
      Uracil arises in cellular DNA by cytosine (C) deamination and erroneous replicative incorporation of deoxyuridine monophosphate opposite adenine. The former generates C ! thymine transition mutations if uracil is not removed by uracil-DNA glycosylase (UDG) and replaced by C by the base excision repair (BER) pathway. The primary human UDG is hUNG. During immunoglobulin gene diversification in ...