Viser treff 367-386 av 527

    • A polarizable continuum model for molecules at spherical diffuse interfaces 

      Di Remigio, Roberto; Mozgawa, Krzysztof; Cao, Hui; Weijo, Ville; Frediani, Luca (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-22)
      We present an extension of the Polarizable Continuum Model (PCM) to simulate solvent effects at diffuse interfaces with spherical symmetry, such as nanodroplets and micelles. We derive the form of the Green’s function for a spatially varying dielectric permittivity with spherical symmetry and exploit the integral equation formalism of the PCM for general dielectric environments to recast the solvation ...
    • Polarizable Density Embedding for Large Biomolecular Systems 

      Reinholdt, Peter; Jørgensen, Frederik Kamper; Kongsted, Jacob; Olsen, Jógvan Magnus Haugaard (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-29)
      We present an efficient and robust fragment-based quantum–classical embedding model capable of accurately capturing effects from complex environments such as proteins and nucleic acids. This is realized by combining the molecular fractionation with conjugate caps (MFCC) procedure with the polarizable density embedding (PDE) model at the level of Fock matrix construction. The PDE contributions to the ...
    • 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 ...
    • Porphyryne 

      Ghosh, Abhik; Conradie, Jeanet (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-25)
      Density functional theory calculations with the B3LYP*-D3 method with large STO-QZ4P basis sets unambiguously predict a singlet ground state for Zn-porphyryne. However, the calculations also predict a low singlet–triplet gap of about 0.4 eV and a high adiabatic electron affinity of 2.4 eV. Accordingly, the reactivity of porphyryne species may be dominated by electron transfer, hydrogen abstraction, ...
    • Potassium [(1S )-1-azido-2-phenylethyl]trifluoridoborate 

      Lejon, Tore; Gorovoy, Alexey Sergeevich; Khrustalev, Victor N. (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      The title compound, K+·C8H8BF3N3-, is a salt containing the chiral organic trifluoridoborate anion. The organic anions and potassium cations are tightly bound to each other by the coordination K-F [2.654 (3)-3.102 (3) Å] and K-N [2.951 (4)-3.338 (4) Å] interactions. Thus, the potassium cation adopts a nine-vertex coordination polyhedron, which can be described as a distorted monocapped tetragonal ...
    • A Pre-initialization Stage of Population-Based Bio-inspired Metaheuristics for Handling Expensive Optimization Problems 

      Muhammad Fuad, Muhammad Marwan (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Metaheuristics are probabilistic optimization algorithms which are applicable to a wide range of optimization problems. Bio-inspired, also called nature-inspired, optimization algorithms are the most widely-known metaheuristics. The general scheme of bio-inspired algorithms consists in an initial stage of randomly generated solutions which evolve through search operations, for several generations, ...
    • Predicting liquid loss of frozen and thawed cod from hyperspectral imaging 

      Anderssen, Kathryn Elizabeth; Stormo, Svein Kristian; Skåra, Torstein; Skjelvareid, Martin Hansen; Heia, Karsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-20)
      As the ability to appraise the quality of every fish in a delivery in a consistent, objective, and rapid manner has numerous advantages for both sellers and buyers, there has been much research into methods to achieve this. One possible proxy for quality assessment is liquid loss, which correlates with undesirable sensory attributes. This study evaluated whether hyperspectral imaging could predict ...
    • Preparation of a Compound with a SiII−SiIV−SiII Bonding Arrangement 

      Kushvaha, Saroj Kumar; Kallenbach, Paula; Gorantla, Sai Manoj N. V. T.; Herbst-Irmer, Regine; Stalke, Dietmar; Roesky, Herbert W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-07)
      Herein, we report the synthesis of a rare bis-silylene, 1, in which two Si<sup>II</sup>atoms are bridged by a Si<sup>IV</sup> atom. Compound 1 contains an unusual Si<sup>II</sup> SiI<sup>V</sup> Si<sup>II</sup> bonding arrangement with Si<sup>II</sup> Si<sup>IV</sup> bond distances of 2.4212(8) and 2.4157(7) Å. Treatment of 1 with Fe(CO)<sub>5</sub> afforded a dinuclear Fe<sup>0</sup>S complex 2 ...
    • Presence of acyl-homoserine lactones in 57 members of the Vibrionaceae family 

      Purohit, Amit Anand; Johansen, Jostein a; Hansen, Hilde; Leiros, Hanna-Kirsti S.; Kashulin, Alexander; Karlsen, Christian; Smalås, Arne O.; Haugen, Peik; Willassen, Nils Peder (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-05-31)
      Aims: The aim of this study was to use a sensitive method to screen and quantify 57 Vibrionaceae strains for the production of acyl-homoserine lactones (AHLs) and map the resulting AHL profiles onto a host phylogeny.<p> <p>Methods and Results: We used a high-performance liquid chromatography– tandem mass spectrometry (HPLC-MS/MS) protocol to measure AHLs in spent media after bacterial growth. ...
    • Preventing E. coli Biofilm Formation with Antimicrobial Peptide-Functionalized Surface Coatings: Recognizing the Dependence on the Bacterial Binding Mode Using Live-Cell Microscopy 

      Hansson, Adam; Karlsen, Eskil André; Stensen, Wenche Gunvor B; Svendsen, John Sigurd Mjøen; Berglin, Mattias; Lundgren, Anders (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-31)
      Antimicrobial peptides (AMPs) can kill bacteria by destabilizing their membranes, yet translating these molecules’ properties into a covalently attached antibacterial coating is challenging. Rational design efforts are obstructed by the fact that standard microbiology methods are ill-designed for the evaluation of coatings, disclosing few details about why grafted AMPs function or do not ...
    • Prevention of Marine Biofouling Using the Natural Allelopathic Compound Batatasin-III and Synthetic Analogues 

      Moodie, Lindon; Trepos, Rozenn; Cervin, Gunnar; Bråthen, Kari Anne; Lindgård, Bente; Reiersen, Rigmor; Cahill, Patrick; Pavia, Henrik; Hellio, Claire; Svenson, Johan (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-21)
      The current study reports the first comprehensive evaluation of a class of allelopathic terrestrial natural products as antifoulants in a marine setting. To investigate the antifouling potential of the natural dihydrostilbene scaffold, a library of 22 synthetic dihydrostilbenes with varying substitution patterns, many of which occur naturally in terrestrial plants, were prepared and assessed for ...
    • Promising Nanocarriers to Enhance Solubility and Bioavailability of Cannabidiol for a Plethora of Therapeutic Opportunities 

      Grifoni, Lucia; Vanti, Giulia; Donato, Rosa; Sacco, Cristiana; Bilia, Anna Rita (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-17)
      In recent years, the interest in cannabidiol (CBD) has increased because of the lack of psychoactive properties. However, CBD has low solubility and bioavailability, variable pharmacokinetics profiles, poor stability, and a pronounced presystemic metabolism. CBD nanoformulations include nanosuspensions, polymeric micelles and nanoparticles, hybrid nanoparticles jelled in cross-linked chitosan, and ...
    • Properties and distribution of a metallo-β-lactamase (ALI-1) from the fish pathogen Aliivibrio salmonicida LFI1238 

      Kristiansen, Anders; Grgic, Miriam; Altermark, Bjørn; Leiros, Ingar (Journal article; Tidsskriftartikkel; Peer reviewed, 2015)
      Objectives. To characterize the chromosome-encoded metallo-β-lactamase (MBL) from the psychrophilic, marine fish-pathogenic bacterium Aliivibrio salmonicida LFI1238 and check for the presence of the gene in other Aliivibrio isolates both connected to the fish-farming industry and from the environment. Methods. The MBL gene was cloned and intracellularly expressed in Escherichia coli. Kinetic ...
    • Protein surface softness is the origin of enzyme cold-adaptation of trypsin 

      Isaksen, Geir Villy; Åqvist, Johan; Brandsdal, Bjørn Olav (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • 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 ...
    • Protonation-Induced Hyperporphyrin Spectra of meso-Aminophenylcorroles 

      Thomassen, Ivar Kristian; 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 <i>meso-</i>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 ...
    • The Pseudoalteromonas multipartite genome: distribution and expression of pangene categories, and a hypothesis for the origin and evolution of the chromid 

      Sonnenberg, Cecilie Bækkedal; Haugen, Peik (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-21)
      Bacterial genomes typically consist of one large chromosome, but can also include secondary replicons. These so-called multipartite genomes are scattered on the bacterial tree of life with the majority of cases belonging to Proteobacteria. Within the class gamma-proteobacteria, multipartite genomes are restricted to the two families <i>Vibrionaceae</i> and <i>Pseudoalteromonadaceae</i>. Whereas the ...
    • Psoriasis pathogenesis – Pso p27 constitutes a compact structure forming large aggregates 

      Lysvand, Hilde; Helland, Ronny; Hagen, Lars; Slupphaug, Geir; Iversen, Ole-Jan (Journal article; Tidsskriftartikkel, 2015-07)
      Psoriasis is a chronic inflammatory skin disease. The absence of microbial organisms as potential causal agents has given rise to the hypothesis that the inflammation is due to an autoimmune reaction. The defined inflamed areas of the skin lesions argue for an immunological disease with a local production of a causal antigen. Pso p27 is a protein generated in mast cells in psoriatic plaques, but ...
    • Pyrazine excited states revisited using the extended multi-state complete active space second-order perturbation method 

      Shiozaki, Toru; Woywod, Clemens Joachim; Werner, Hans-Joachim (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      We demonstrate that the recently developed extended multi-state complete active space second-order perturbation theory (XMS-CASPT2) [Shiozaki et al., J. Chem. Phys., 2011, 135, 081106] provides qualitatively correct potential energy surfaces for low-lying excited singlet states of pyrazine, while the potential energy surfaces of the standard MS-CASPT2 methods are ill-behaved near the crossing ...
    • Pyridine-3-carbaldehyde 2-pyridylhydrazone 

      Schaper, KJ; Hansen, Lars Kr; Perlovich, German; Bauer-Brandl, Annette (Journal article; Tidsskriftartikkel; Peer reviewed, 2007)