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Browsing by Subject "kinetics"

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    • Article  

      Addition of Electron-Rich Aromatics to Azafullerenium Carbocation. A Stepwise Electrophilic Substitution Mechanism 

      Vougioukalakis, G. C.; Chronakis, Nikos; Orfanopoulos, Michael (2003)
      (Matrix presented) The reaction between the C59N+ carbocation and the electron-rich aromatic compounds toluene and anisole has been mechanistically studied. The measured intermolecular kinetic isotope effects are consistent ...

    • Article  

      Brownian-like kinematics of ball milling for particulate structural modeling 

      Doumanidis, C. C.; Kaabi, H. A. Al; Alzaabi, A. S. M.; Gunduz, I. E.; Rebholz, Claus; Doumanidis, C. C. (2016)
      Ball milling motion has been previously studied through computationally expensive, off-line experimental video processing and numerical simulations by the discrete element method. This research establishes a more efficient ...

    • Article  

      Carbon dioxide storage in olivine basalts: Effect of ball milling process 

      Rigopoulos, Ioannis; Petallidou, Klito C.; Vasiliades, Michalis A.; Delimitis, Andréas; Ioannou, Ioannis; Efstathiou, Angelos M.; Kyratsi, Theodora (2015)
      The goal of this study is to propose a cost-effective method for the optimization of the ex situ carbonation of basaltic rocks. The ball milling process was applied to a sample of olivine basalt from the Troodos ophiolite ...

    • Article  

      Charge generation in inorganic/organic photovoltaic blends 

      Westenhoff, S.; Hayes, Sophia C.; Greenham, N. C.; Silva, C. (2004)
      We apply ultrafast spectroscopy to investigate charge generation kinetics in blends of semiconducting polymers and cadmium selenide nanocrystals with photovoltaic applications. The rate is limited by diffusion of the primary ...

    • Article  

      Kinetics of methane oxidative coupling on zinc-doped titanium oxide 

      Efstathiou, Angelos M.; Boudouvas, D.; Vamvuka, Despina; Verykios, Xenophon E. (1992)
      A kinetic study of methane conversion to C2-hydrocarbons was conducted by cofeeding methane and oxygen at 1 bar total pressure over a series of zinc-doped TiO2 catalysts. The zinc dopant concentration was varied between 1 ...

    • Article  

      A mathematical model of the unfolded protein stress response reveals the decision mechanism for recovery, adaptation and apoptosis 

      Erguler, K.; Pieri, Myrtani; Constantinou-Deltas, Constantinos D. (2013)
      Background: The unfolded protein response (UPR) is a major signalling cascade acting in the quality control of protein folding in the endoplasmic reticulum (ER). The cascade is known to play an accessory role in a range ...

    • Article  

      Modulating unimolecular charge transfer by exciting bridge vibrations 

      Lin, Z.; Lawrence, C. M.; Xiao, D.; Kireev, V. V.; Skourtis, Spiros S.; Sessler, J. L.; Beratan, David N.; Rubtsov, I. V. (2009)
      (Figure Presented) Ultrafast UV-vibrational spectroscopy was used to investigate how vibrational excitation of the bridge changes photoinduced electron transfer between donor (dimethylaniline) and acceptor (anthracene) ...

    • Article  

      Multiresponsive polymer conetworks capable of responding to changes in pH, temperature, and magnetic field: Synthesis, characterization, and evaluation of their ability for controlled uptake and release of solutes 

      Papaphilippou, P.; Christodoulou, M.; Marinica, O. M.; Taculescu, A.; Vekas, L.; Chrissafis, K.; Krasia-Christoforou, T. (2012)
      This study deals with the preparation of novel multiresponsive (magnetoresponsive, thermoresponsive and pH-responsive) nanocomposite conetworks consisting of oleic acid-coated magnetite nanoparticles (OA•Fe 3O 4), ...

    • Article  

      NMR and theoretical investigations on the structures and dynamics of octahedral bis(chelate)dichloro VIII compounds isolated by an unusual reduction of non-oxo VIV species 

      Rikkou, Maria P.; Manos, Manolis J.; Tolis, Evangelos I.; Sigalas, Michael P.; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2003)
      Reaction of the non-oxo VIV species [VIVCl2(LOO)2] [LOO = acetylacetonate (acac-) or benzoylacetonate (bzac-)] with a chelate nitrogen-donor ligand LNN in acetonitrile leads to the reduction of VIV to VIII and the formation ...

    • Article  

      Novel mixed metal Ag(I)-Sb(III)-metallotherapeutics of the NSAIDs, aspirin and salicylic acid: Enhancement of their solubility and bioactivity by using the surfactant CTAB 

      Gkaniatsou, E. I.; Banti, Christina N.; Kourkoumelis, Nikolaos; Skoulika, S.; Manoli, Maria; Tasiopoulos, Anastasios J.; Hadjikakou, Sotiris K. (2015)
      The already known Ag(I)-Sb(III) compound of the formula {Ag(Ph3Sb)3(NO3)} (1) and two novel mixed metal Ag(I)-Sb(III) metallotherapeutics of the formulae {Ag(Ph3Sb)3(SalH)}(2) and {Ag(Ph3Sb)3(Asp)}(3) (SalH2 = salicylic ...

    • Article  

      Observation of the equilibrium CuB-CO complex and functional implications of the transient heme a3 propionates in cytochrome ba3-CO from Thermus thermophilus. Fourier transform infrared (FTIR) and time-resolved step-scan FTIR studies 

      Koutsoupakis, Constantinos; Stavrakis, Stavros; Pinakoulaki, Eftychia; Soulimane, T.; Varotsis, Constantinos (2002)
      We report the first evidence for the existence of the equilibrium CuB 1+-CO species of CO-bound reduced cytochrome ba3 from Thermus thermophilus at room temperature. The frequency of the C-O stretching mode of CuB 1+-CO ...

    • Article  

      The phosphoform of the regulatory subunit RII of cyclic AMP-dependent protein kinase possesses intrinsic topoisomerase activity 

      Constantinou, Andreas I.; Squinto, S. P.; Jungmann, R. A. (1985)
      The phosphoform of the type II regulatory subunit (phospho-RII-cAMP) of cAMP-dependent protein kinase from rat liver was found to possess intrinsic topoisomerase activity towards several DNA substrates such as φX174, pBR322, ...

    • Article  

      Photosynthesis from the protein's perspective 

      Skourtis, Spiros S.; Beratan, David N. (2007)

    • Article  

      Physical constraints on charge transport through bacterial nanowires 

      Polizzi, N. F.; Skourtis, Spiros S.; Beratan, David N. (2012)
      Extracellular appendages of the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1 were recently shown to sustain currents of 10 10 electrons per second over distances of 0.5 microns [El-Naggar et al., Proc. ...

    • Article  

      The selective oxidation of methane to C2-hydrocarbons over lithium-doped TiO2 catalysts 

      Papageorgiou, D.; Efstathiou, Angelos M.; Verykios, Xenophon E. (1994)
      The oxidative coupling of methane (OCM) to C2-hydrocarbons was studied on a series of lithiumdoped titania catalysts by cofeeding methane (PCH4 = 0.5 bar) and oxygen (Po2 = 0.07-0.16 bar) at 1 bar total pressure in the ...

    • Article  

      Singlet hydrocarbon carbenes with high barriers toward isomerization: A computational investigation 

      Nicolaïdes, Andrew N. (2003)
      A prerequisite for a stable singlet hydrocarbon carbene is the existence of high barriers toward isomerization. Four derivatives of cyclopentylidene (1-4) with rigid and varying carbon cages are examined computationally ...

    • Article  

      Spectroscopic investigation on the formation of hypochlorite by alpha radiolysis in concentrated NaCl solutions 

      Kelm, M.; Pashalidis, Ioannis; Kim, J. I. (1999)
      The hypochlorite formation induced by alpha radiation in saline solutions is studied by UV/VIS spectroscopy. Experiments are carried out in NaCl solutions of various concentrations between 1 and 5 mol/l and with volume ...

    • Article  

      Steering electrons on moving pathways. 

      Beratan, David N.; Skourtis, Spiros S.; Balabin, I. A.; Balaeff, A.; Keinan, S.; Venkatramani, R.; Xiao, D. (2009)
      Electron transfer (ET) reactions provide a nexus among chemistry, biochemistry, and physics. These reactions underpin the "power plants" and "power grids" of bioenergetics, and they challenge us to understand how evolution ...

    • Article  

      A structural, kinetic model of soft tissue thermomechanics 

      Barocas, V. Η; Stylianopoulos, T.; Aksan, A. (2008)
      A structure-based kinetic model was developed to predict the thermomechanical response of collagenous soft tissues. The collagen fibril was represented as an ensemble of molecular arrays with cross-links connecting the ...

    • Article  

      Water solubility, antioxidant activity and cytochrome C binding of four families of exohedral adducts of C60 and C70 

      Witte, P.; Beuerle, F.; Hartnagel, U.; Lebovitz, R.; Savouchkina, A.; Sali, S.; Guldi, D.; Chronakis, Nikos; Hirsch, A. (2007)
      Over the past decade, surface-modified, water soluble fullerenes have been shown by many different investigators to exhibit strong antioxidant activity against reactive oxygen species (ROS) in vitro and to protect cells ...

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