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Browsing by Subject "iron"

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    • Article  

      Americium and samarium determination in aqueous solutions after separation by cation-exchange 

      Kiliari, T.; Pashalidis, Ioannis (2014)
      The concentration of trivalent americium and samarium in aqueous samples has been determined by means of alpha-radiometry and UV-Vis photometry, respectively, after chemical separation and pre-concentration of the elements ...

    • Article  

      Competition studies of L1-deferiprone with copper and iron. Possible implications on efficacy, toxicity and new therapeutic applications 

      Pashalidis, Ioannis; Kontoghiorghes, G. J. (2000)

    • 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  

      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  

      Highly efficient spin filtering of ballistic electrons 

      Steinmuller, S. J.; Trypiniotis, Theodossis; Cho, W. S.; Hirohata, A.; Lew, W. S.; Vaz, C. A. F.; Bland, J. A. C. (2004)
      Spin dependent electron transport in hybrid Au/Co/Cu/NiFe/n-GaAs spin valve Schottky barrier structures was investigated using photoexcitation at various wavelengths. For excitation with the photon energy well above the ...

    • Article  

      Homeostatic interplay between bacterial cell-cell signaling and iron in virulence 

      Hazan, R.; He, J.; Xiao, G.; Dekimpe, V.; Apidianakis, Yiorgos; Lesic, B.; Astrakas, C.; Déziel, Eric; Lépine, F.; Rahme, L. G. (2010)
      Pathogenic bacteria use interconnected multi-layered regulatory networks, such as quorum sensing (QS) networks to sense and respond to environmental cues and external and internal bacterial cell signals, and thereby adapt ...

    • Article  

      Interactions of hydroxycarbamide (Hydroxyurea) with Iron and copper: Implications on toxicity and therapeutic strategies 

      Konstantinou, E.; Pashalidis, Ioannis; Kolnagou, A.; Kontoghiorghes, G. J. (2011)
      Presented at the 19th International Conference on Chelation, London, UK, 13-16 November 2009Preliminary spectrophotometric and potentiometric studies have shown that hydroxycarbamide or hydroxyurea (HU) can interact with ...

    • Article  

      Lead halide perovskites and other metal halide complexes as inorganic capping ligands for colloidal nanocrystals 

      Dirin, D. N.; Dreyfuss, S.; Bodnarchuk, M. I.; Nedelcu, G.; Papagiorgis, Panagiotis; Itskos, Grigorios; Kovalenko, M. V. (2014)
      Lead halide perovskites (CH3NH3PbX3, where X = I, Br) and other metal halide complexes (MXn, where M = Pb, Cd, In, Zn, Fe, Bi, Sb) have been studied as inorganic capping ligands for colloidal nanocrystals. We present the ...

    • Article  

      Nitrite coordination in myoglobin 

      Ioannou, Androulla; Lambrou, Alexandra; Daskalakis, Vangelis; Pinakoulaki, Eftychia (2017)
      The coordination of nitrite in myoglobin (Mb) has been characterized by resonance Raman spectroscopy and the frequencies of the nitrite bound to the heme Fe as well to the 2-vinyl have been computed by density functional ...

    • 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  

      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  

      Reactivation of an aged commercial three-way catalyst by oxalic and citric acid washing 

      Christou, Stavroula Y.; Birgersson, H.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)
      The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83 000 km) commercial three-way catalyst (TWC) has been investigated. ...

    • Article  

      Resonance Raman detection of the Fe2+-C-N modes in heme-copper oxidases: A probe of the active site 

      Pinakoulaki, Eftychia; Vamvouka, M.; Varotsis, Constantinos (2004)
      Resonance Raman spectroscopy has been employed to investigate the reduced cyano complexes of cytochrome aa3 from bovine heart and Rhodobacter sphaeroides and of cytochrome bo3 from E. coli. In the aa 3-type oxidases, the ...

    • Article  

      Simultaneous resonance Raman detection of the heme a3-Fe-CO and CuB-CO species in CO-bound ba3-cytochrome c oxidase from Thermus thermophilus: Evidence for a charge transfer CuB-CO transition 

      Pinakoulaki, Eftychia; Ohta, T.; Soulimane, T.; Kitagawa, T.; Varotsis, Constantinos (2004)
      Understanding of the chemical nature of the dioxygen and nitric oxide moiety of ba3-cytochrome c oxidase from Thermus thermophilus is crucial for elucidation of its physiological function. In the present work, direct ...

    • Article  

      Structural effects of crosslinking a biopolymer hydrogel derived from marine mussel adhesive protein 

      Loizou, Elena; Weisser, J. T.; Dundigalla, A.; Porcar, L.; Schmidt, G.; Wilker, J. J. (2006)
      In an effort to explore new biocompatible substrates for biomedical technologies, we present a structural study on a crosslinked gelatinous protein extracted from marine mussels. Prior studies have shown the importance of ...

    • Article  

      The structure of the hyponitrite species in a heme Fe-Cu binuclear center 

      Varotsis, Constantinos; Ohta, T.; Kitagawa, T.; Soulimane, T.; Pinakoulaki, Eftychia (2007)
      NO laughing matter: The enzymatic production of laughing gas (N 2O) from two molecules of NO requires the formation of the N-N bond and the subsequent cleavage of the N-OH bond. Resonance Raman spectroscopic studies have ...

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