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Browsing by Subject "Spectroscopy, Fourier Transform Infrared"

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    • Article  

      Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions 

      Hadjittofi, Loukia; Prodromou, Melpomeni; Pashalidis, Ioannis (2014)
      The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...

    • Article  

      Authenticity of cypriot sweet wine commandaria using FT-IR and chemometrics 

      Ioannou-Papayianni, Elena; Kokkinofta, Rebecca I.; Theocharis, Charis R. (2011)
      FT-IR spectra of 65 sweet wines produced in Cyprus and other countries were determined, in order to study the authenticity and uniqueness of the Cypriot traditional wine "Commandaria" that is produced from sun-dried grapes. ...

    • Article  

      Decay of the transient CuB-CO complex is accompanied by formation of the heme Fe-CO complex of cytochrome cbb3-CO at ambient temperature: Evidence from time-resolved fourier transform infrared spectroscopy 

      Stavrakis, Stavros; Koutsoupakis, Constantinos; Pinakoulaki, Eftychia; Urban, A.; Saraste, M.; Varotsis, Constantinos (2002)
      Time-resolved step-scan Fourier infrared spectroscopy has been used to study the CO-bound cbb3-type cytochrome c oxidase from Pseudomonas stutzeri at room temperature. We observe a single band in the FTIR spectrum at 1956 ...

    • Article  

      Detection of the His-heme Fe2+-NO species in the reduction of NO to N2O by ba3-oxidase from thermus thermophilus 

      Pinakoulaki, Eftychia; Ohta, T.; Soulimane, T.; Kitagawa, T.; Varotsis, Constantinos (2005)
      Reaction pathways in the enzymatic formation and cleavage of the N-N and N-O bonds, respectively, are difficult to verify without the structure of the intermediates, but we now have such information on the heme a3 2+-NO ...

    • Article  

      Fourier transform infrared (FTIR) and step-scan time-resolved FTIR spectroscopies reveal a unique active site in cytochrome caa3 oxidase from Thermus thermophilus 

      Pinakoulaki, Eftychia; Soulimane, T.; Varotsis, Constantinos (2002)
      Fourier transform infrared (FTIR) and step-scan time-resolved FTIR difference spectra are reported for the [carbonmonoxy]cytochrome caa3 from Thermus thermophilus. A major C-O mode of heme a3 at 1958 cm-1 and two minor ...

    • Article  

      New antimony(III) halide complexes with dithiocarbamate ligands derived from thiuram degradation: The effect of the molecule's close contacts on in vitro cytotoxic activity 

      Urgut, O. S.; Ozturk, I. I.; Banti, Christina N.; Kourkoumelis, Nikolaos; Manoli, Maria; Tasiopoulos, Anastasios J.; Hadjikakou, Sotiris K. (2016)
      Antimony(III) halide complexes of the formulae {[SbBr(Me2DTC)2]n} (1), {[SbI(Me2DTC)2]n} (2) and {[(Me2DTC)2Sb(μ2-I)Sb(Me2DTC)2]+.I3-} (3) (Me2DTC = dimethyldithiocarbomate) were synthesized from SbX3, (X = Br or I) and ...

    • 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  

      Probing the ligand recognition and discrimination environment of the globin-coupled oxygen sensor protein YddV by FTIR and time-resolved step-scan FTIR spectroscopy 

      Pavlou, A.; Martínková, M.; Shimizu, T.; Kitanishi, K.; Stranava, M.; Loullis, Andreas; Pinakoulaki, Eftychia (2015)
      YddV is a newly discovered signal transducer heme protein that recognizes O2 and CO. Structural differences in the ligand-bound heme complex in YddV reflect variations in catalytic regulation by O2 and CO. Time-resolved ...

    • Article  

      Probing the nitrite and nitric oxide reductase activity of cbb3 oxidase: Resonance Raman detection of a six-coordinate ferrous heme-nitrosyl species in the binuclear b3/CuB center 

      Loullis, Andreas; Pinakoulaki, Eftychia (2015)
      In this work we report the first spectroscopic evidence demonstrating that cbb3 oxidase catalyzes the reduction of nitrite to nitrous oxide under reducing anaerobic conditions. The reaction proceeds through the formation ...

    • Article  

      Recognition and discrimination of gases by the oxygen-sensing signal transducer protein HemAT as revealed by FTIR spectroscopy 

      Pinakoulaki, Eftychia; Yoshimura, H.; Yoshioka, S.; Aono, S.; Varotsis, Constantinos (2006)
      The determination of ligand binding properties is a key step in our understanding of gas sensing and discrimination by gas sensory proteins. HemAT is a newly discovered signal transducer heme protein that recognizes O 2 ...

    • Article  

      Synthesis, characterization and biological studies of new antimony(III) halide complexes with ω-thiocaprolactam 

      Ozturk, I. I.; Banti, Christina N.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Kourkoumelis, Nikolaos; Charalabopoulos, Konstantinos A.; Hadjikakou, Sotiris K. (2012)
      Three new antimony(III) halide complexes (SbX 3, X = Cl, Br and I) with the heterocyclic thione ω-thiocaprolactam (1-azacycloheptane-2- thione, (Hthcl)) of formulae {[SbCl 2(μ 2-Cl)(Hthcl) 2] n} (1), {[(SbBr 2(μ 2-Br)(Hthcl) ...

    • Article  

      Time-Resolved Resonance Raman and Time-Resolved Step-Scan FTIR Studies of Nitric Oxide Reductase from Paracoccus denitrificans: Comparison of the Heme b3-FeB Site to That of the Heme-CuB in Oxidases 

      Pinakoulaki, Eftychia; Varotsis, Constantinos (2003)
      Time-resolved resonance Raman (TR3) and time-resolved step-scan (TRS2) FTIR spectroscopies have been used to probe the structural dynamics at the heme b3 proximal and distal sites after carbon monoxide photolysis from fully ...

    • Article  

      Time-resolved step-scan Fourier transform infrared investigation of heme-copper oxidases: Implications for O2 input and H 2O/H+ output channels 

      Koutsoupakis, Constantinos; Pinakoulaki, Eftychia; Stavrakis, Stavros; Daskalakis, Vangelis; Varotsis, Constantinos (2004)
      We have applied FTIR and time-resolved step-scan Fourier transform infrared (TRS2-FTIR) spectroscopy to investigate the dynamics of the heme-CuB binuclear center and the protein dynamics of mammalian aa3, Pseudomonas ...

    • Article  

      Two ligand-binding sites in the O2-sensing signal transducer HemAT: Implications for ligand recognition/discrimination and signaling 

      Pinakoulaki, Eftychia; Yoshimura, H.; Daskalakis, Vangelis; Yoshioka, S.; Aono, S.; Varotsis, Constantinos (2006)
      We have identified a ligand (CO) accommodation cavity in the signal transducer sensor protein HemAT (heme-based aerotactic transducer) that allows us to gain single-molecule insights into the mechanism of gas sensor proteins. ...

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