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Browsing by Subject "Hydrogen-Ion Concentration"

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    • Article  

      Adsorption of hexavalent chromium on dunite 

      Demetriou, Antri; Pashalidis, Ioannis (2011)
      The paper presents and discusses the effect of various physicochemical parameters (e.g. pH, ionic strength, Cr(VI) initial concentration, amount of the adsorbent, temperature and contact time between metal ion and adsorbent) ...

    • Article  

      Amphiphilic model conetworks based on cross-linked star copolymers of benzyl methacrylate and 2-(dimenthylamino)ethyl methacrylate: Synthesis, characterization, and DNA adsorption studies 

      Achilleos, Demetra S.; Georgiou, Theoni K.; Patrickios, Costas S. (2006)
      Six amphiphilic model conetworks of a new structure, that of cross-linked "in-out" star copolymers, were synthesized by the group transfer polymerization (GTP) of the hydrophobic monomer benzyl methacrylate (BzMA) and the ...

    • Article  

      Analysis of polyphenols using capillary zone electrophoresis - Determination of the most effective wine sample pre-treatment method 

      Nicolaou, I. N.; Kapnissi‐Christodoulou, Constantina P. (2010)
      A simple CZE method has been developed for the simultaneous determination of eight polyphenolic compounds. The influence of several experimental conditions such as buffer (concentration and pH) and temperature were studied. ...

    • Article  

      Chiral separation of Huperzine A using CE - Method validation and application in pharmaceutical formulations 

      Tsioupi, Despina A.; Nicolaou, I. N.; Moore, L.; Kapnissi‐Christodoulou, Constantina P. (2012)
      The aim of this work is the development, validation and application of an MEKC method for the chiral separation of Huperzine A. Huperzine A is an important compound that is used to treat Alzheimer's disease. However, only ...

    • Article  

      Computational protein design: The proteus software and selected applications 

      Simonson, T.; Gaillard, T.; Mignon, D.; Schmidt Am Busch, M.; Lopes, A.; Amara, Najette; Polydorides, Savvas; Sedano, A.; Druart, Karen; Archontis, Georgios Z. (2013)
      We describe an automated procedure for protein design, implemented in a flexible software package, called Proteus. System setup and calculation of an energy matrix are done with the XPLOR modeling program and its sophisticated ...

    • Article  

      Copper(II) removal from aqueous solutions by adsorption on non-treated and chemically modified cactus fibres 

      Prodromou, Melpomeni; Pashalidis, Ioannis (2013)
      The adsorption efficiency of a biomass by-product (cactus fibres) regarding the removal of copper(II) from aqueous solutions has been investigated before and after its chemical treatment. The chemical treatment of the ...

    • Article  

      Coupling of helix E-F motion with the O-nitrito and 2-nitrovinyl coordination in myoglobin 

      Ioannou, Androulla; Lambrou, Alexandra; Daskalakis, Vangelis; Pinakoulaki, Eftychia (2017)
      Myoglobin (Mb) is known to react slowly with nitirite to form the green pigment by NO2 − cordination to the heme Fe in the O-binding nitrito (O1[sbnd]N[dbnd]O2) mode and to the heme 2-vinyl position. Nitrite is a powerful ...

    • Article  

      Development of a capillary electrophoresis-mass spectrometry method for the determination of rivastigmine in human plasma - Optimization of the limits of detection and quantitation 

      Nicolaou, I. N.; Kapnissi‐Christodoulou, Constantina P. (2012)
      A capillary zone electrophoresis-electrospray ionization-mass spectrometry (CZE-ESI-MS) method was developed for the analysis of the acetylcholinesterase inhibitor rivastigmine. Several electrophoretic and ESI-MS parameters ...

    • Article  

      Direct detection of Fe(IV)=O intermediates in the cytochrome aa3 oxidase from Paracoccus denitrificans[H2O2 reaction 

      Pinakoulaki, Eftychia; Pfitzner, U.; Ludwig, B.; Varotsis, Constantinos (2003)
      We report the first evidence for the formation of the "607- and 580-nm forms" in the cytochrome oxidase aa3/H2O2 reaction without the involvement of tyrosine 280. The pKa of the 607-580-nm transition is 7.5. The 607-nm ...

    • Article  

      Effects of sol-gel synthesis on 5Fe-15Mn-40Zn-40Ti-O mixed oxide structure and its H2S removal efficiency from industrial gas streams 

      Polychronopoulou, Kyriaki; Efstathiou, Angelos M. (2009)
      A novel Fe-Mn-Zn-Ti-O mixed metal oxide has been developed for efficient low-temperature (25-50°C) removal of H2S from a gas mixture containing 600 ppm H2S, 25 vol% H2, 7.5 vol % CO 2, and 1-3 vol% H2O that simulates typical ...

    • Article  

      Evaluation of amino acid ester-based ionic liquids as buffer additives in CE for the separation of 2-arylpropionic acids nonsteroidal anti-inflammatory drugs 

      Mavroudi, Maria C.; Kapnissi‐Christodoulou, Constantina P. (2014)
      The aim of the present study is the CE performance evaluation for the separation of 2-arylpropionic acid nonsteroidal anti-inflammatory drugs. In particular, the separation of indoprofen, carprofen, ketoprofen, ibuprofen, ...

    • Article  

      Experimental and theoretical studies on physico-chemical parameters affecting the solubility of phosphogypsum 

      Papanicolaou, F.; Antoniou, Stella; Pashalidis, Ioannis (2009)
      Phosphogypsum is a waste by-product of the phosphate fertilizer industry, which is usually disposed in the environment because of its restricted use in industrial applications. Physico-chemical conditions existing in stack ...

    • Article  

      Is vanadate reduced by thiols under biological conditions? Changing the Redox potential of V(V)/V(IV) by complexation in aqueous solution 

      Crans, D. C.; Zhang, B.; Gaidamauskas, E.; Keramidas, Anastasios D.; Willsky, G. R.; Roberts, C. R. (2010)
      Although dogma states that vanadate is readily reduced by glutathione, cysteine, and other thiols, there are several examples documenting that vanadium(V)-sulfur complexes can form and be observed. This conundrum has ...

    • Article  

      Molecular factors affecting the complex formation between deferiprone (L1) and Cu(II): Possible implications on efficacy and toxicity 

      Pashalidis, Ioannis; Kontoghiorghes, G. J. (2001)
      Deferiprone (1,2-dimethyl-3-hydroxypyrid-4-one, L1, CAS 30652-11-0) is a new chelating drug used worldwide for the treatment of iron overloading conditions. Spectrophotometric and potentiometric measurements were carried ...

    • 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  

      Nanoscopic cationic methacrylate star homopolymers: Synthesis by group transfer polymerization, characterization and evaluation as transfection reagents 

      Georgiou, Theoni K.; Vamvakaki, Maria; Patrickios, Costas S.; Yamasaki, E. N.; Phylactou, Leonidas A. (2004)
      Seven star polymers with degrees of polymerization (DPs) of the arms from 10 to 100 and dimensions in the nanometer range were prepared using sequential group transfer polymerization of 2-(dimethylamino)-ethyl methacrylate ...

    • 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  

      Open-tubular capillary electrochromatography/electrospray ionization-mass spectrometry using polymeric surfactant as a stationary phase coating 

      Zhu, X.; Kamande, M. W.; Thiam, S.; Kapnissi‐Christodoulou, Constantina P.; Mwongela, S. M.; Warner, I. M. (2004)
      We describe the use of the polymeric surfactant poly(sodium undecylenic sulfate) (poly-SUS) as a stationary phase coating in open-tubular capillary electrochromatog raphy (OT-CEC) coupled with electrospray ionization-mass ...

    • Article  

      Probing nitrite coordination in horseradish peroxidase by resonance Raman spectroscopy: Detection of two binding sites 

      Ioannou, Androulla; Pinakoulaki, Eftychia (2017)
      Nitrite is a powerful oxidant that affects the activity of peroxidases towards various substrates and leads to heme macrocycle modifications in members of the peroxidase family, such as the horseradish peroxidase (HRP). ...

    • Article  

      Proton binding to proteins: A free-energy component analysis using a dielectric continuum model 

      Archontis, Georgios Z.; Simonson, T. (2005)
      Proton binding plays a critical role in protein structure and function. We report pKa calculations for three aspartates in two proteins, using a linear response approach, as well as a "standard" Poisson-Boltzmann approach. ...

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