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  • Adsorption of Organic Pollutants in Microplastic in the Arctic Ocean 

    Nordang, Unni Mette (Master thesis; Mastergradsoppgave, 2019-05-15)
    Oceans all over the world are housing large quantities of plastic pollution and persistent organic pollutants (POPs). Concerns regarding both of them having lipophilic characteristic that allows a successful partitioning of POPs to plastic if in contact in an aqueous medium, led to this study where the relationship between different types of plastic and POPs in the Arctic ocean are looked into. In ...
  • Computational and experimental insights into asymmetric Rh‐catalyzed hydrocarboxylation with CO2 

    Pavlovic, Ljiljana; Pettersen, Martin; Gevorgyan, Ashot; Vaitla, Janakiram; Bayer, Annette; Hopmann, Kathrin Helen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-18)
    The asymmetric Rh‐catalyzed hydrocarboxylation of α,β‐unsaturated carbonyl compounds was originally developed by Mikami and co‐workers but gives only moderate enantiomeric excesses. In order to understand the factors controlling the enantioselectivity and to propose novel ligands for this reaction, we have used computational and experimental methods to study the Rh‐catalyzed hydrocarboxylation with ...
  • Rhenium-Imido Corroles 

    Alemayehu, Abraham; Teat, Simon J.; Borisov, Sergey M.; Ghosh, Abhik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-10)
    Metallocorroles involving 5d transition metals are currently of interest as near-IR phosphors and as photosensitizers for oxygen sensing and photodynamic therapy. Their syntheses, however, are often bedeviled by capricious and low-yielding protocols. Against this backdrop, we describe rhenium-imido corroles, a new class of 5d metallocorroles, synthesized simply and in respectable (∼30%) yields via ...
  • Organometallic Chemistry for Enabling Carbon Dioxide Utilization 

    Hazari, Nilay; Iwasawa, Nobuharu; Hopmann, Kathrin Helen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-11)
    <p>In photosynthesis, carbon dioxide is used as the carbon source; indeed, most carbon atoms in the structure of a massive tree—the trunk, the branches, the leaves—originate from CO2. This insight has profound implications for chemical synthesis: complex molecular structures are built from something as simple and inert as CO<sub>2</sub>. Scientists have long been fascinated by this concept, and ...
  • Renewable Solvents for Palladium-Catalyzed Carbonylation Reactions 

    Ismael, Aya; Gevorgyan, Ashot; Skrydstrup, Troels; Bayer, Annette (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-04)
    Solvents constitute the largest component for many chemical processes and substitution of nonrenewable solvents is a longstanding goal for green chemistry. Here, we show that Pd-catalyzed carbonylative couplings, such as carbonylative cross-couplings, aminocarbonylations, and alkoxycarbonylations, can be successfully realized using renewable solvents. The present research covers not only well-established ...
  • General recurrence-relation generation scheme for molecular integral evaluation 

    Gao, Bin (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)
    We develop a new scheme for evaluating different molecular integrals using Gaussian type orbitals. In this new scheme, the evaluation of integrals is performed in two steps during runtime. The first step is a top-down procedure that maps each recurrence relation into a jagged array (array of arrays), where each element of a member array represents either the final results or some intermediate integrals ...
  • Effects of fecal microbiota transplantation in subjects with irritable bowel syndrome are mirrored by changes in gut microbiome 

    Goll, Rasmus; Johnsen, Peter Holger; Hjerde, Erik; Diab, Joseph; Valle, Per Christian; Hilpüsch, Frank; Cavanagh, Jorunn Pauline (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-29)
    Irritable bowel syndrome (IBS) is a common disorder of the lower gastrointestinal tract. The pathophysiology is far from settled, but a gut microbial dysbiosis is hypothesized to be a contributing factor. We earlier published a randomized double-blind placebo-controlled clinical trial on fecal microbiota transplantation (FMT) for IBS – the REFIT trial. The present data set describes the engraftment ...
  • Two SnRK2-Interacting Calcium Sensor Isoforms Negatively Regulate SnRK2 Activity by Different Mechanisms 

    Tarnowski, Krzysztof; Klimecka, Maria; Ciesielski, Arkadiusz; Goch, Grazyna; Kulik, Anna; Fedak, Halina; Poznanski, Jaroslaw; Lichocka, Malgorzata; Pierechod, Marcin Miroslaw; Engh, Richard Alan; Dadlez, Michal; Dobrowolska, Grazyna; Bucholc, Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-07)
    SNF1-related protein kinases 2 (SnRK2s) are key signaling elements regulating abscisic acid-dependent plant development and responses to environmental stresses. Our previous data showed that the SnRK2-interacting Calcium Sensor (SCS) inhibits SnRK2 activity. Use of alternative transcription start sites located within the Arabidopsis (Arabidopsis thaliana) AtSCS gene results in two in-frame transcripts ...
  • The crystal structure of the tetrameric DABA-aminotransferase EctB, a rate-limiting enzyme in the ectoine biosynthesis pathway 

    Hillier, Heidi Therese; Altermark, Bjørn; Leiros, Ingar (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-29)
    L‐2,4‐diaminobutyric acid (DABA) aminotransferases can catalyze the formation of amines at the distal ω‐position of substrates, and is the intial and rate‐limiting enzyme in the biosynthesis pathway of the cytoprotecting molecule (S)‐2‐methyl‐1,4,5,6‐tetrahydro‐4‐pyrimidine carboxylic acid (ectoine). Although there is an industrial interest in the biosynthesis of ectoine, the DABA aminotransferases ...
  • A Polymer Magician: Professor Charlotte K. Williams 

    Hopmann, Kathrin Helen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-28)
    At Organometallics, the Editorial Team has been highlighting a number of scientists that we feel have had a profound impact on the field and perhaps also on ourselves. In this editorial, I wish to introduce another of our Pioneers and Influencers, Professor Charlotte K. Williams from Oxford University. Professor Williams works on three things I love: homogeneous metal catalysts, carbon dioxide, and ...
  • Biochemical characterization of ferric uptake regulator (Fur) from Aliivibrio salmonicida. Mapping the DNA sequence specificity through binding studies and structural modelling 

    Berg, Kristel; Pedersen, Hege Lynum; Leiros, Ingar (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-09)
    Iron is an essential nutrient for bacteria, however its propensity to form toxic hydroxyl radicals at high intracellular concentrations, requires its acquisition to be tightly regulated. Ferric uptake regulator (Fur) is a metal-dependent DNA-binding protein that acts as a transcriptional regulator in maintaining iron metabolism in bacteria and is a highly interesting target in the design of new ...
  • Structure and mechanism of a phage-encoded SAM lyase revises catalytic function of enzyme family 

    Isaksen, Geir Villy; Guo, Xiaohu; Söderholm, Annika; Kanchugal P, Sandesh; Warsi, Omar; Eckhard, Ulrich; Silvia, Trigüis; Gogoll, Adolf; Jerlström-Hultqvist, Jon; Åqvist, Johan; Anderson, Dan I; Selmer, Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-10)
    The first S-adenosyl methionine (SAM) degrading enzyme (SAMase) was discovered in bacteriophage T3, as a counter-defense against the bacterial restriction-modification system, and annotated as a SAM hydrolase forming 5’ methyl-thioadenosine (MTA) and L-homoserine. From environmental phages, we recently discovered three SAMases with barely detectable sequence similarity to T3 SAMase and without ...
  • Molecular Structure of Copper and μ-Oxodiiron Octafluorocorrole Derivatives: Insights into Ligand Noninnocence 

    Thomas, Kolle E.; Settineri, Nicholas S.; Teat, Simon J.; Steene, Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-23)
    Single-crystal X-ray structures were obtained for the copper and μ-oxodiiron complexes of 2,3,7,8,12,13,17,18-octafluoro-5,10,15-triphenylcorrole, hereafter denoted as Cu[F8TPC] and {Fe[F8TPC]}2O. A comparison with the crystal structures of other undecasubstituted Cu corroles, including those with H, Ar, Br, I, and CF3 as β-substituents, showed that the degree of saddling increases in the order: H ...
  • Protonation-Induced Hyperporphyrin Spectra of meso-Aminophenylcorroles 

    Thomassen, Ivar K.; Ghosh, Abhik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-06)
    UV–vis spectrophotometric titrations have been carried out on <i>meso</i>-tris(<i>o/m/p</i>-aminophenyl)corrole (H<sub>3</sub>[<i>o/m/p</i>-TAPC]) and meso-triphenylcorrole (H<sub>3</sub>[TPC]) in dimethyl sulfoxide with methanesulfonic acid (MSA). Monoprotonation was found to result in hyperporphyrin spectra characterized by new, red-shifted, and intense Q bands. The effect was particularly dramatic ...
  • Facile Supramolecular Engineering of Porphyrin cis Tautomers: The Case of β-Octabromo-meso-tetraarylporphyrins 

    Thomas, Kolle E.; Slebodnick, Carla; Ghosh, Abhik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-02)
    A porphyrin cis tautomer, where the two central NH protons are on adjacent pyrrole rings, has long been invoked as an intermediate in porphyrin tautomerism. Only recently, however, has such a species been isolated and structurally characterized. Thus, single-crystal X-ray structure determinations of two highly saddled free-base porphyrins, β-heptakis(trifluoromethyl)-meso-tetrakis(p-fluorophenyl)porphyrin, ...
  • Nature of the copper-nitrosyl intermediates of copper nitrite reductases during catalysis 

    Hough, Michael A.; Conradie, Jeanet; Strange, Richard W.; Antonyuk, Svetlana V.; Eady, Robert R.; Ghosh, Abhik; Hasnain, S. Samar (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-20)
    The design and synthesis of copper complexes that can reduce nitrite to NO has attracted considerable interest. They have been guided by the structural information on the catalytic Cu centre of the widespread enzymes Cu nitrite reductases but the chemically novel side-on binding of NO observed in all crystallographic studies of these enzymes has been questioned in terms of its functional relevance. ...
  • X-ray absorption spectroscopy of archetypal chromium porphyrin and corrole derivatives 

    Cao, Rui; Thomas, Kolle E.; Ghosh, Abhik; Sarangi, Ritimukta (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-29)
    A combination of Cr K-edge XAS and DFT calculations have been performed on archetypal chromium porphyrinoid complexes Cr<sup>IV</sup>[TMP]O (<b>2</b>) and Cr<sup>V</sup>[TPC]O (<b>3</b>), and the results have been compared to the reference compound Cr<sup>III</sup>[TPP]Cl (<b>1</b>), where TPP<sup>2−</sup>, TMP<sup>2−</sup>, and TPC<sup>3−</sup> are the anions of <i>meso</i>-tetraphenylporphyrin, ...
  • The high catalytic rate of the cold-active Vibrio alkaline phosphatase requires a hydrogen bonding network involving a large interface loop 

    Hjörleifsson, Jens Guðmundur; Helland, Ronny; Magnusdottir, Manuela; Ásgeirsson, Bjarni (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-16)
    The role of surface loops in mediating communication through residue networks is still a relatively poorly understood part in the study of cold adaptation of enzymes, especially in terms of their quaternary interactions. Alkaline phosphatase (AP) from the psychrophilic marine bacterium <i>Vibrio splendidus</i> (VAP) is characterized by an analogous large surface loop in each monomer, referred to as ...
  • 1H, 13C, 15N resonance assignment of the apo form of the small, chitin-active lytic polysaccharide monooxygenase JdLPMO10A from Jonesia denitrificans 

    Christensen, Idd Andrea; Eijsink, Vincent; Aachmann, Finn Lillelund; Courtade, Gaston (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-19)
    The lytic polysaccharide monooxygenase <i>Jd</i>LPMO10A is the N-terminal domain of the multimodular protein Jd1381. The isolated <i>Jd</i>LPMO10A domain is one of the smallest chitin-active lytic polysaccharide monooxygenases known to date with a size of only 15.5 kDa. <i>Jd</i>LPMO10A is a copper-dependent oxidative enzyme that depolymerizes chitin by hydroxylating the C1 carbon in the glycosidic ...
  • nsroot: Minimalist process isolation tool implemented with Linux namespaces 

    Raknes, Inge Alexander; Fjukstad, Bjørn; Bongo, Lars Ailo Aslaksen (Journal article; Tidsskriftartikkel, 2017-11-26)
    Data analyses in the life sciences are moving from tools run on a personal computer to services run on large computing platforms. This creates a need to package tools and dependencies for easy installation, configuration and deployment on distributed platforms. In addition, for secure execution there is a need for process isolation on a shared platform. Existing virtual machine and container ...

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