Browsing by Subject "oxygen"

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 ...