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Browsing by Subject "oxygen"

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    • Article  

      Aerial Oxidation of a VIV-Iminopyridine Hydroquinonate Complex: A Trap for the VIV-Semiquinonate Radical Intermediate 

      Stylianou, M.; Drouza, C.; Giapintzakis, John; Athanasopoulos, G. I.; Keramidas, A. D. (2015)
      The reaction of 2,5-bis[N,N′-bis(2-pyridyl-aminomethyl)aminomethyl]-p-hydroquinone (H2bpymah) with VO2+ salts in acetonitrile or water at a low pH (2.2-3.5) results in the isolation of [VIV(O)(Cl)2(μ-bpymah)], the ...

    • Article  

      Aerial Oxidation of a VIV-Iminopyridine Hydroquinonate Complex: A Trap for the VIV-Semiquinonate Radical Intermediate 

      Stylianou, Marios; Drouza, Chryssoula; Giapintzakis, Ioannis; Athanasopoulos, Georgios I.; Keramidas, Anastasios D. (2015)
      The reaction of 2,5-bis[N,N′-bis(2-pyridyl-aminomethyl)aminomethyl]-p-hydroquinone (H2bpymah) with VO2+ salts in acetonitrile or water at a low pH (2.2-3.5) results in the isolation of [{VIV(O)(Cl)}2(μ-bpymah)], the ...

    • Article  

      Angiotensin inhibition enhances drug delivery and potentiates chemotherapy by decompressing tumour blood vessels 

      Chauhan, V. P.; Martin, J. D.; Liu, H.; Lacorre, D. A.; Jain, S. R.; Kozin, S. V.; Stylianopoulos, T.; Mousa, A. S.; Han, X.; Adstamongkonkul, P.; Popovic, Z.; Huang, P.; Bawendi, M. G.; Boucher, Y.; Jain, R. K. (2013)
      Cancer and stromal cells actively exert physical forces (solid stress) to compress tumour blood vessels, thus reducing vascular perfusion. Tumour interstitial matrix also contributes to solid stress, with hyaluronan ...

    • Article  

      Combined chemical and optical methods for monitoring the early decay stages of surrogate human models 

      Statheropoulos, Miltiades K.; Agapiou, Agapios; Zorba, Eleni; Mikedi, Katerina; Karma, Sofia; Pallis, George C.; Eliopoulos, C.; Spiliopoulou, C. (2011)
      As the body decays shortly after death, a variety of gases and volatile organic compounds (VOCs) constantly emanate. Ethical and practical reasons limit the use of human corpses in controlled, time-dependent, intervening ...

    • Article  

      A compendium of volatile organic compounds (VOCs) released by human cell lines 

      Filipiak, W.; Mochalski, Paweł; Filipiak, A.; Ager, C.; Cumeras, R.; Davis, C. E.; Agapiou, Agapios; Unterkofler, K.; Troppmair, J. (2016)
      Volatile organic compounds (VOCs) offer unique insights into ongoing biochemical processes in healthy and diseased humans. Yet, their diagnostic use is hampered by the limited understanding of their biochemical or cellular ...

    • Article  

      Discrete and encapsulated molecular grids: Homometallic Mn15 and heterometallic Mn24Ni2 aggregates 

      Charalambous, Maria; Zartilas, Sotiris M.; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Manos, Manolis J.; Stamatatos, Theocharis C.; Mukherjee, S.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2014)
      Two molecular grid-like clusters are reported, one is a discrete [3 × 5] grid and the other a [3 × 4] grid within a Mn12Ni 2 loop. Both Mn24Ni2 and Mn15 aggregates display novel and aesthetically pleasing structures with ...

    • Article  

      Donor atom electrochemical contribution to redox potentials of square pyramidal vanadyl complexes 

      Vlasiou, Manolis; Drouza, Chryssoula; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2015)
      A simple donor atom additivity relationship has been used to calculate the donor atom electrochemical contribution (DEC) of the Oac (acetylacetonate-enolic oxygen), OPh (phenolic oxygen), SPh (mercaptophenol sulfur), Nam ...

    • 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  

      Effects of the CePO 4 on the oxygen storage and release properties of CeO 2 and Ce 0.8Zr 0.2O 2 solid solution 

      Larese, C.; Galisteo, F. C.; Granados, M. L.; Mariscal, R.; Fierro, José Luis García; Lambrou, Panayiota S.; Efstathiou, Angelos M. (2004)
      In an attempt to gain fundamental information about the role of P on the chemical deactivation of a three-way catalyst (TWC), P was deliberatively incorporated in CeO 2 and Ce 0.8Zr 0.2O 2 solid solution. XRD, Raman, XPS, ...

    • Article  

      Impurity-induced antiferromagnetic order in the Haldane-gap compound PbNi2-xMgxV2O8 (x=0.24) 

      Lappas, A.; Alexandrakis, V.; Giapintzakis, John; Pomjakushin, V.; Prassides, K.; Schenck, A. (2002)
      An investigation of the effect of nonmagnetic Mg doping in the Haldane gap system PbNi2V2O8 is presented. Specifically, the magnetic properties of the quasi-one-dimensional compound PbNi2-xMgxV2O8 (x =0.24), located in the ...

    • Article  

      Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalyst 

      Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)
      A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

    • Article  

      Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalystAAA 

      Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)
      A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

    • Article  

      Molybdenum(VI) coordination chemistry of the N,N-disubstituted bis(hydroxylamido)-1,3,5-triazine ligand, H2bihyat. Water-assisted activation of the MoVI=O bond and reversible dimerization of cis-[MoVIO2(bihyat)] to [MoVI2O 4(bihyat)2(H2O)2] 

      Stylianou, Marios; Nikolakis, Vladimiros A.; Chilas, G. I.; Jakusch, T.; Vaimakis, T.; Kiss, Tamás; Sigalas, Michael P.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2012)
      Reaction of the N,N-disubstituted bis(hydroxylamino) ligand 2,6-bis[hydroxy(methyl)amino]-4-morpholino-1,3,5-triazine (H2bihyat) with cis-[MoVIO2(acac)2] in tetrahydrofuran resulted in isolation of the mononuclear compound ...

    • Article  

      Monolayers, bilayers and micelles of zwitterionic lipids as model systems for the study of specific anion effects 

      Aroti, Andria; Leontidis, Epameinondas; Dubois, M.; Zemb, T.; Brezesinski, G. (2007)
      This work is a review of the effect of different monovalent anions (belonging to the Hofmeister series) on a single model amphiphile, phosphatidylcholine molecules in contact with water, in three different geometries, ...

    • Article  

      Monomeric compounds containing the cis-[V(=O)(OH)]+ core 

      Tolis, Evangelos I.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Raptopoulou, Catherine P.; Terzis, Aris; Sigalas, Michael P.; Deligiannakis, Yiannis G.; Kabanos, Themistoklis A. (2002)
      HYSCORE with a vanadium core: Examples of monomeric metal compounds containing the cis-[M(=O)(OH)]n+ unit, namely the VIVO2+ complexes [VIVO(OH)(bipy)2]BF4 (1

    • Article  

      Multi-purpose healthcare telemedicine systems with mobile communication link support 

      Kyriacou, Efthyvoulos C.; Pavlopoulos, Sotirios A.; Berler, A.; Neophytou, Marios; Bourka, A.; Georgoulas, Aggelos; Anagnostaki, Anthoula P.; Karayiannis, D.; Schizas, Christos N.; Pattichis, Constantinos S.; Andreou, Andreas S.; Koutsouris, Demetrios Dionysios (2003)
      The provision of effective emergency telemedicine and home monitoring solutions are the major fields of interest discussed in this study. Ambulances, Rural Health Centers (RHC) or other remote health location such as Ships ...

    • 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  

      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 origin of the Fe IV = O intermediates in cytochrome aa 3 oxidase 

      Pinakoulaki, Eftychia; Daskalakis, Vangelis; Varotsis, Constantinos (2012)
      The dioxygen reduction mechanism in cytochrome oxidases relies on proton control of the electron transfer events that drive the process. Proton delivery and proton channels in the protein that are relevant to substrate ...

    • Article  

      The protein effect in the structure of two ferryl-oxo intermediates at the same oxidation level in the heme copper binuclear center of cytochrome c oxidase 

      Pinakoulaki, Eftychia; Daskalakis, Vangelis; Ohta, T.; Richter, O. -M H.; Budiman, K.; Kitagawa, T.; Ludwig, B.; Varotsis, Constantinos (2013)
      Identification of the intermediates and determination of their structures in the reduction of dioxygen to water by cytochrome c oxidase (CcO) are particularly important to understanding both O2 activation and proton pumping ...

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