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Fletta eftir deild "Science Institute (UI)"

Fletta eftir deild "Science Institute (UI)"

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  • Hjörleifsson, Jens G; Ásgeirsson, Bjarni (Wiley, 2018-12-21)
    Most enzymes are homodimers or higher order multimers. Cold‐active alkaline phosphatase from Vibrio splendidus (VAP) transitions into a dimer with very low activity under mild denaturation conditions. The desire to understand why this dimer fails to ...
  • Gudmundsson, Vidar; Gestsson, Hallmann; Abdullah, Nzar; Tang, Chi-Shung; Manolescu, Andrei; Moldoveanu, Valeriu (2019-03-01)
    In this work, we theoretically model the time-dependent transport through an asymmetric double quantum dot etched in a two-dimensional wire embedded in a far-infrared (FIR) photon cavity. For the transient and the intermediate time regimes, the current ...
  • Hjörleifsson, Jens G; Ásgeirsson, Bjarni (Elsevier BV, 2016-07)
    Alkaline phosphatase is a homodimeric metallo-hydrolase where both Zn2+ and Mg2+ are important for catalysis and stability. Cold-adapted alkaline phosphatase variants have high activity at low temperatures and lower thermal stability compared with ...
  • Bessarab, Pavel (American Physical Society (APS), 2017-04-24)
    Rohart et al. [Phys. Rev. B 93, 214412 (2016)] recently reported calculations indicating two mechanisms for the annihilation of a skyrmion in a Co monolayer on Pt(111). The path calculations were based on a method presented in the Supplemental Material ...
  • Rees, Julian A.; Bjornsson, Ragnar; Kowalska, Joanna K.; Lima, Frederico A.; Schlesier, Julia; Sippel, Daniel; Weyhermüller, Thomas; Einsle, Oliver; Kovacs, Julie A.; DeBeer, Serena (Royal Society of Chemistry (RSC), 2017)
    An investigation of the active site cofactors of the molybdenum and vanadium nitrogenases (FeMoco and FeVco) was performed using high-resolution X-ray spectroscopy. Synthetic heterometallic iron–sulfur cluster models and density functional theory ...
  • Brown, Adam R.; Gharibyan, Hrant; Lin, Henry W.; Susskind, Leonard; Thorlacius, Larus; Zhao, Ying (American Physical Society (APS), 2019-02-25)
    The Jackiw-Teitelboim (JT) model arises from the dimensional reduction of charged black holes. Motivated by the holographic complexity conjecture, we calculate the late-time rate of change of action of a Wheeler-DeWitt patch in the JT theory. ...
  • Erdmenger, Johanna; Fernández, Daniel; Goulart, Prieslei; Witkowski, Piotr (Springer Nature, 2017-03)
    In the context of applications of the AdS/CFT correspondence to condensed matter physics, we compute conductivities for field theory duals of dyonic planar black holes in 3+1-dimensional Einstein-Maxwell-dilaton theories at zero temperature. We ...
  • Belyakov, Alexander V.; Sigolaev, Yrii F.; Shlykov, Sergey A.; Wallevik, Sunna Ó.; Jónsdóttir, Nanna R.; Jónsdóttir, Sigríður; Kvaran, Agust; Bjornsson, Ragnar; Árnason, Ingvar (Elsevier BV, 2017-03)
    The conformational preference of the cyano group of the 1-cyano-1-silacyclohexane was studied experimentally by means of gas electron diffraction (GED) and dynamic nuclear magnetic resonance (DNMR) as well as by quantum chemical (QC) calculations ...
  • Kozin, Valerii (Springer Science and Business Media LLC, 2019-09-01)
    The BCFW recursion relation in N = 4 super-Yang-Mills theory is solved using Yang-Baxter R-operators in the NMHV sector. Explicit expressions for R-invariants are obtained in terms of the chains of R-operators acting on an appropriate basic state.
  • Bjarnason, Ingi Þorleifur; Pechmann, James C. (The Seismological Society of America, 1989)
    We have completed a comprehensive study of focal mechanisms of digitally recorded earthquakes (M, -_< 4.4) that occurred in the Wasatch front region in Utah during 1980 to 1986. Single-event solutions for 24 events were determined using recently ...
  • Bobev, Nikolay; Fischbacher, Thomas; Gautason, Fridrik F; Pilch, Krzysztof (Springer Science and Business Media LLC, 2020-07-01)
    We report on a systematic search for AdS5 vacua corresponding to critical points of the potential in the five-dimensional N = 8 SO(6) gauged supergravity. By employing Google’s TensorFlow Machine Learning library, we find the total of 32 critical points ...
  • Keränen, Ville; Sybesma, Watse; Szepietowski, Phillip; Thorlacius, Larus (Springer Nature, 2017-05)
    The 2+1 dimensional quantum Lifshitz model can be generalised to a class of higher dimensional free field theories that exhibit Lifshitz scaling. When the dynamical critical exponent equals the number of spatial dimensions, equal time correlation ...
  • Darbyshire, Fiona A.; Bjarnason, Ingi Þorleifur; White, Robert S.; Flóvenz, Ólafur G. (Oxford University Press (OUP), 1998-12)
    The crustal structure of central Iceland is modelled using data from a 310 km long refraction profile shot during summer 1995. The profile traversed Iceland from the Skagi Peninsula on the north coast (surface rocks of age 8.5–0.8 Myr) to the southeast ...
  • Boschini, M. J.; Torre, S. Della; Gervasi, M.; Grandi, D.; Jóhannesson, Guðlaugur; Vacca, G. La; Masi, N.; Moskalenko, I. V.; Pensotti, S.; Porter, T. A.; Quadrani, L.; Rancoita, P. G.; Rozza, D.; Tacconi, M. (American Astronomical Society, 2018-05-04)
    Local interstellar spectra (LIS) of primary cosmic ray (CR) nuclei, such as helium, oxygen, and mostly primary carbon are derived for the rigidity range from 10 MV to ~200 TV using the most recent experimental results combined with the state-of-the-art ...
  • Grytz, C. M.; Kazemi, S.; Marko, A.; Cekan, P.; Güntert, P.; Sigurdsson, Snorri; Prisner, Thomas F. (Royal Society of Chemistry (RSC), 2017)
    Distance measurements are performed between a pair of spin labels attached to nucleic acids using Pulsed Electron–Electron Double Resonance (PELDOR, also called DEER) spectroscopy which is a complementary tool to other structure determination methods ...
  • Maras, Emile; Saito, Mitsuhiro; Inoue, Kazutoshi; Jónsson, Hannes; Ikuhara, Yuichi; McKenna, Keith Patrick (Elsevier BV, 2019-01-15)
    A global optimization procedure is used to predict the structure and electronic properties of the b = c[001] edge dislocation in rutile TiO2. Over 1000 different atomic configurations have been generated using both semi-empirical and density functional ...
  • Chakraborty, Sandeep; Rendón-Ramírez, Adela; Ásgeirsson, Bjarni; Dutta, Mouparna; Ghosh, Anindya S.; Oda, Masataka; Venkatramani, Ravindra; Rao, Basuthkar J.; Dandekar, Abhaya M.; Goñi, Félix M. (F1000Research, 2015-01-29)
    The long term side effects of any newly introduced drug is a subject of intense research, and often raging controversies. One such example is the dipeptidyl peptidase-IV (DPP4) inhibitor used for treating type 2 diabetes, which is inconclusively ...
  • Monger, Lindsey J.; Runarsdottir, Gerdur R.; Suman, Sigridur G (Springer Science and Business Media LLC, 2020-07-16)
    Alkylation of the C-terminus acids in small peptides allows direction to amine and amide coordination, while changing the peptide composition to form tetradentate κ4[n,5,5], where n = 5-, 6-, 7-, or 8-membered ring coordination geometries, can be ...
  • Kaminker, Ilia; Bye, Morgan; Mendelman, Natanel; Gislason, Kristmann; Sigurdsson, Snorri; Goldfarb, Daniella (Royal Society of Chemistry (RSC), 2015)
    Mn2+ localization in hairpin 92 of the 23S ribosomal RNA (HP92) was obtained using W-band (95 GHz) DEER (double electron-electron resonance) distance measurements between the Mn2+ ion and nitroxide spin labels on the RNA. It was found to be preferably ...
  • Palonen, H.; Magnus, Fridrik; Hjörvarsson, Björgvin (American Physical Society (APS), 2018-10-12)
    The conventional magnetic proximity effect and double-proximity effects were studied in a set of fully coherent high-quality Fe/Fe0.32V0.68 superlattices. Applying a simple model to the saturation magnetization, it is seen that the magnetic proximity ...