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276 results on '"Pikramenou, Zoe"'

8. Women in science: Chemistry 2021

Author

Conte, Valeria, primary, Emmerling, Franziska Luise, additional, Pikramenou, Zoe, additional, Jing, Lihong, additional, Kočí, Kamila, additional, Chen, Xi, additional, and Boldyreva, Elena Vladimirovna, additional

Published
2023
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14. Alginate-based microparticles coated with HPMCP/AS cellulose-derivatives enable the Ctx(Ile21)-Ha antimicrobial peptide application as a feed additive

Author

Roque-Borda, Cesar Augusto, primary, Silva, Hanyeny Raiely Leite, additional, Crusca Junior, Edson, additional, Serafim, Jéssica Aparecida, additional, Meneguin, Andréia Bagliotti, additional, Chorilli, Marlus, additional, Macedo, Wagner Costa, additional, Teixeira, Silvio Rainho, additional, Guastalli, Elisabete Aparecida Lopes, additional, Soares, Nilce Maria, additional, Blair, Jessica M.A., additional, Pikramenou, Zoe, additional, and Vicente, Eduardo Festozo, additional

Published
2021
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15. Improved Ink-Jet-Printed CdSe Quantum Dot Light-Emitting Diodes with Minimized Hole Transport Layer Erosion

Author

Tang, Haodong, primary, Jia, Siqi, additional, Ding, Shihao, additional, Liu, Pai, additional, Ma, Jingrui, additional, Xiao, Xiangtian, additional, Qu, Xiangwei, additional, Liu, Haochen, additional, Yang, Hongcheng, additional, Xu, Bing, additional, Chen, Wei, additional, Li, Guangyu, additional, Pikramenou, Zoe, additional, Anthony, Carl, additional, Wang, Kai, additional, and Sun, Xiao Wei, additional

Published
2021
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16. Measurement of parts per million level gaseous concentration of hydrogen sulfide by ultraviolet spectroscopy using 1,1,1,5,5,5-hexafluoropentan-2,4-dione as a derivative by reaction of Cu(hfac)(1,5-Cyclooctadiene)

Author

Davidson, J. Michael, Pikramenou, Zoe, Ponce, Adrian, and Winpenny, Richard E.P.

Subjects
Trace analysis -- Methods, Hydrogen sulfide -- Properties, Hydrogen sulfide -- Measurement, Ultraviolet spectroscopy -- Methods, Ultraviolet spectroscopy -- Usage, Gases -- Properties, Chemistry
Abstract

Hydrogen sulfide reacts rapidly and quantitatively at ppm levels with cycloocta- 1,5-diene- 1,1,1,5,5,5-hexafluoropentan-2,4-dionatocopper(I) (Cu(hfac)(COD)) to yield 1,1,1,5,5,5-hexafluoropentan-2,4-dione (Hhfac) having a strong ultraviolet absorption at 268 nm, and which can be used without interference as a derivative in the continuous, fast online spectroscopic determination of the [H.sub.2]S concentration. The analytical method has excellent selectivity and can be used in the presence of [N.sub.2], [H.sub.2], CO, COS, S[O.sub.2], moist air, C[H.sub.3]OH, [C.sub.2][H.sub.4], [C.sub.6][H.sub.6], and light alkanes including fuel gases. Using a standard spectrometer, the level of detection is about 10 ppb. Concentrations down to 1 ppm H2S can be analyzed readily, usually with an error in the range 0 to -7% dependent largely on the sorption characteristics of the apparatus. These are systematic errors due to adsorption; however, the analytical apparatus was very stable, and relative standard deviations as low as 0.1% of the mean can be obtained. The method can also be applied to the analysis of methanethiol.

Published
2009

17. Alginate-based microparticles coated with HPMCP/AS cellulose-derivatives enable the Ctx(Ile21)-Ha antimicrobial peptide application as a feed additive

Author

Roque Borda, Cesar Augusto, primary, Leite Silva, Hanyeny Raiely, additional, Junior, Edson Crusca, additional, Aparecida Serafim, Jéssica, additional, Bagliotti Meneguin, Andréia, additional, Chorilli, Marlus, additional, Macedo, Wagner Costa, additional, Teixeira, Silvio Rainho, additional, Lopes Guastalli, Elisabete Aparecida, additional, Soares, Nilce Maria, additional, Blair, Jessica MA, additional, Pikramenou, Zoe, additional, and Vicente, Eduardo Festozo, additional

Published
2021
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21. Highly luminescent, triple- and quadruple-stranded, dinuclear Eu, Nd, and Sm(III) lanthanide complexes based on bis-diketonate ligands

Author

Bassett, Andrew P., Luisa De Cola, Pikramenou, Zoe, Magennis, Steven W., Glover, Peter B., Lewis, David J., Spencer, Neil, Parsons, Simon, and Williams, Rene M.

Subjects
Ligands -- Research, Luminescence -- Research, Ketones, Chemistry
Abstract

A novel ligand design based on diketonate binding units is represented for the assembly of neutral tris- and quadruple-stranded dinuclear lanthanide complexes with interesting luminescent properties. The sensitizing properties of the ligands are investigated by luminescence spectroscopy.

Published
2004

27. Photo‐ and Electrochemical Dual‐Responsive Iridium Probe for Saccharide Detection.

Author

Carrod, Andrew J., Graglia, Francesco, Male, Louise, Le Duff, Cécile, Simpson, Peter, Elsherif, Mohamed, Ahmed, Zubair, Butt, Haider, Xu, Guang‐Xi, Kam‐Wing Lo, Kenneth, Bertoncello, Paolo, and Pikramenou, Zoe

Subjects
SACCHARIDES, IRIDIUM, MONOSACCHARIDES, BORONIC acids, AQUEOUS solutions, LUMINESCENCE, CANCER cells
Abstract

Dual detection systems are of interest for rapid, accurate data collection in sensing systems and in vitro testing. We introduce an IrIII complex with a boronic acid receptor site attached to the 2‐phenylpyridine ligand as an ideal probe with photo‐ and electrochemical signals that is sensitive to monosaccharide binding in aqueous solution. The complex displays orange luminescence at 618 nm, which is reduced by 70 and 40 % upon binding of fructose and glucose, respectively. The electro‐chemiluminescent signal of the complex also shows a direct response to monosaccharide binding. The IrIII complex shows the same response upon incorporation into hydrogel matrices as in solution, thus demonstrating the potential of its integration into a device, as a nontoxic, simple‐to‐use tool to observe sugar binding over physiologically relevant pH ranges and saccharide concentrations. Moreover, the complex's luminescence is responsive to monosaccharide presence in cancer cells. [ABSTRACT FROM AUTHOR]

Published
2022
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29. An azido-bridged [FeII4] grid-like molecule showing spin crossover behaviour.

Author

Guo, Zhilin, You, Maolin, Deng, Yi-Fei, Liu, Qiang, Meng, Yin-Shan, Pikramenou, Zoe, and Zhang, Yuan-Zhu

Subjects
SPIN crossover, SINGLE molecule magnets, PERMUTATION groups, PYRIDAZINES, MOLECULES
Abstract

The supramolecular self-assembly synthetic strategy provides a valid tool to obtain polynuclear Fe(II) complexes having effective communication between the metal centres and distinct spin crossover behaviour. Despite the great success in constructing various magnetic molecules, progress has not been made in SCO complexes based on azido bridges. In this article, the coordination-driven supramolecular assembly based on 3,6-substituted pyridazine and azide is presented to afford two Fe(II) grid-like complexes: [(L)4Fe II4 (N3)4][BPh4]4·sol (1, L = 3,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)pyridazine and 2, L = 3,6-di(pyridin-2-yl)pyridazine). The substitution of pyridinyl groups in 2 instead of pyrazolyl ones in 1 led to the only example exhibiting spin-crossover behaviour (T1/2 = 230 K) among the azido-bridged complexes. In addition, a temperature-dependent photoluminescence study of 2 demonstrates a visible synergetic effect between the SCO event and the luminescence. [ABSTRACT FROM AUTHOR]

Published
2021
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30. Luminescent supramolecular architectures: a cyclodextrin modified with a europium(III) crown swing

Author

Pikramenou, Zoe and Nocera, Daniel G.

Subjects
Cyclodextrins -- Research, Europium -- Research, Crown ethers -- Research, Benzene -- Research, Fluoroscopy -- Methods, Chemistry
Abstract

A cyclodextrin functionalized with a europium(3) (Eu3+)-containing 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane crown ether represents a new series of synthesized supramolecular structures exhibiting photophysical properties. The Eu3+-crown-swing-modified cyclodextrin features luminescence properties similar to simple Eu3+ aza crown swing ethers. Moreover, the supramolecular structures undergo absorption-energy-transfer-emission reaction upon the addition of benzene which results in the increased release of Eu3+ ions.

Published
1992

33. Assisted delivery of anti-tumour platinum drugs using DNA-coiling gold nanoparticles bearing lumophores and intercalators: towards a new generation of multimodal nanocarriers with enhanced action

Author

Caballero, Ana B., primary, Cardo, Lucia, additional, Claire, Sunil, additional, Craig, James S., additional, Hodges, Nikolas J., additional, Vladyka, Anton, additional, Albrecht, Tim, additional, Rochford, Luke A., additional, Pikramenou, Zoe, additional, and Hannon, Michael J., additional

Published
2019
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34. Long-lived near-infrared luminescent lanthanide complexes of imidodiphosphinate 'shell' ligands

Author

Bassett, Andrew P., Van Deun, Rik, Nockemann, Peter, Kariuki, Benson M, Van Meervelt, Luc, Glover, Peter B., Van Hecke, Kristof, and Pikramenou, Zoe

Subjects
Rare earth metals -- Electric properties, Chemical synthesis -- Research, Neodymium -- Electric properties, Erbium -- Electric properties, Chemistry
Abstract

The synthesis and characterization of near-infrared (NIR) emitting complexes of Nd(III), Er(III) and Yd(III) based on hexacoordinate lanthanide ions with an aryl functionalized imidodiphosphinate ligand, tpip, are described. The results indicate the effective shielding of the lanthanide by the twelve phenyl groups of the tpip ligands and the reduction of high-energy vibrations in close proximity to the lanthanide, which are the two important features in the design of NIR emitting lanthanide complexes.

Published
2005

36. Iridium Nanoparticles for Multichannel Luminescence Lifetime Imaging, Mapping Localization in Live Cancer Cells

Author

King, Siobhan M., primary, Claire, Sunil, additional, Teixeira, Rodolfo I., additional, Dosumu, Abiola N., additional, Carrod, Andrew J., additional, Dehghani, Hamid, additional, Hannon, Michael J., additional, Ward, Andrew D., additional, Bicknell, Roy, additional, Botchway, Stanley W., additional, Hodges, Nikolas J., additional, and Pikramenou, Zoe, additional

Published
2018
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39. A unidirectional energy transfer cascade process in a ruthenium junction self-assembled by alpha- and beta-cyclodextrins

Author

Faiz, Jonathan A., Williams, Rene M., Silva, Maria Jose J. Pereira, Cola, Luisa De, and Pikramenou, Zoe

Subjects
Energy transformation -- Analysis, Dextrins -- Structure, Dextrins -- Chemical properties, Dextrins -- Optical properties, Cascades (Fluid dynamics) -- Analysis, Ruthenium -- Structure, Ruthenium -- Chemical properties, Chemistry
Abstract

Alpha- and beta-cyclodextrins were grafted onto a ruthenium core, which can act as a junction by the selective binding of the tailor-made photoactive guests in which a unidirectional two-step photoinduced energy transfer process takes place. The directed self-assembly strategy based on the judicious selection of the host and guest component allows the construction of unidirectional wires of nanoscles dimensions.

Published
2006

41. Platelet actin nodules are podosome-like structures dependent on Wiskott-Aldrich syndrome protein and ARP2/3 complex

Author

Poulter, Natalie S., Pollitt, Alice Y., Davies, Amy, Malinova, Dessislava, Nash, Gerard B., Hannon, Mike J., Pikramenou, Zoe, Rappoport, Joshua Z., Hartwig, John H., Owen, Dylan M., Thrasher, Adrian J., Watson, Stephen P., and Thomas, Steven G.

Subjects
macromolecular substances
Abstract

The actin nodule is a novel F-actin structure present in platelets during early spreading. However, only limited detail is known regarding nodule organization and function. Here we use electron microscopy, SIM and dSTORM super-resolution, and live-cell TIRF microscopy to characterize the structural organization and signalling pathways associated with nodule formation. Nodules are composed of up to four actin-rich structures linked together by actin bundles. They are enriched in the adhesion-related proteins talin and vinculin, have a central core of tyrosine phosphorylated proteins and are depleted of integrins at the plasma membrane. Nodule formation is dependent on Wiskott-Aldrich syndrome protein (WASp) and the ARP2/3 complex. WASp(-/-) mouse blood displays impaired platelet aggregate formation at arteriolar shear rates. We propose actin nodules are platelet podosome-related structures required for platelet-platelet interaction and their absence contributes to the bleeding diathesis of Wiskott-Aldrich syndrome.

Published
2015

42. Silica Nanoparticles for Micro-Particle Imaging Velocimetry: Fluorosurfactant Improves Nanoparticle Stability and Brightness of Immobilized Iridium(III) Complexes

Author

Lewis, David J., Dore, Valentina, Rogers, Nicola J., Mole, Thomas K., Nash, Gerard B., Angeli, Panagiota, and Pikramenou, Zoe

Abstract

To establish highly luminescent nanoparticles for monitoring fluid flows, we examined the preparation of silica nanoparticles based on immobilization of a cyclometalated iridium(III) complex and an examination of the photophysical studies provided a good insight into the Ir(III) microenvironment in order to reveal the most suitable silica nanoparticles for micro particle imaging velocimetry (μ-PIV) studies. Iridium complexes covalentlyincorporated at the surface of preformed silica nanoparticles, [Ir-4]@Si500-Z, using a fluorinated polymer during their preparation, demonstrated better stability than those without the polymer, [Ir-4]@Si500, as well as an increase in steady state photoluminescence intensity (and therefore particle brightness) and lifetimes which are increased by 7-fold compared with nanoparticles with the same metal complex attached covalently throughout their core, [Ir-4]⊂Si500. Screening of the nanoparticles in fluid flows using epi-luminescence microscopy also confirm that the brightest, and therefore most suitable particles for microparticle imaging velocimetry (μ-PIV) measurements are those with the Ir(III) complex immobilized at the surface with fluorosurfactant, that is [Ir-4]@Si500-Z. μ-PIV studies demonstrate the suitability of these nanoparticles as nanotracers in microchannels.

Published
2024
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43. Metallocyclodextrins as building blocks in noncovalent assemblies of photoactive units for the study of photoinduced intercomponent processes

Author

Haider, Johanna M., Chavarot, Murielle, Weidner, Steffen, Sadler, Ian, Williams, Rene M., Pikramenou, Zoe, and De Cola, Luisa

Subjects
Ruthenium -- Research, Ruthenium -- Electric properties, Electron transport -- Research, Cyclodextrins -- Research, Cyclodextrins -- Electric properties, Chemistry
Abstract

The characterization of a terpyridine-functionalized cyclodextrin and its ruthenium-cyclodextrin complexes as well as the photophysical studies of these metallocyclodextrins with organic guests and metalloguests is reported. Photoinduced electron transfer between the ruthenium(II) and osmium(III) photoactive centers assembled by the cyclodextrin cavity is demonstrated by time-resolved spectroscopy.

Published
2001

48. Luminescence sensing and imaging: general discussion

Author

Ceroni, Paola, primary, Pikramenou, Zoe, additional, Prodi, Luca, additional, Pan, Qing, additional, Adams, Dave, additional, Weinstein, Julia, additional, Lewis, Frederick, additional, Bohne, Cornelia, additional, Vlcek, Antonin, additional, Bassani, Dario M., additional, de Silva, Amilra Prasanna, additional, Moucheron, Cécile, additional, Nocera, Dan, additional, Díaz-Moscoso, Alejandro, additional, Padilla, Marc, additional, Lemon, Christopher, additional, Campagna, Sebastiano, additional, Bradberry, Samuel, additional, Galoppini, Elena, additional, Plötz, Per-Arno, additional, Kelly, John M., additional, Rohacova, Jana, additional, Harriman, Anthony, additional, Keane, Páraic, additional, Gust, Devens, additional, Vos, Johannes, additional, Mauro, Matteo, additional, De Cola, Luisa, additional, Nambalan Sivaraman, Saleesh Kumar, additional, Lemercier, Gilles, additional, Osborne, Shani, additional, and Monti, Filippo, additional

Published
2015
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50. Self-organization of photo-active nanostructures: general discussion

Author

Pikramenou, Zoe, primary, Weinstein, Julia, additional, Pan, Qing, additional, Lewis, Frederick, additional, Bassani, Dario M., additional, Würthner, Frank, additional, Moucheron, Cécile, additional, Slota, Michael, additional, Díaz-Moscoso, Alejandro, additional, Karlsson, Joshua, additional, Basílio, Nuno, additional, Adams, Dave, additional, Scandola, Franco, additional, Bohne, Cornelia, additional, Lemon, Christopher, additional, Campagna, Sebastiano, additional, Rohacova, Jana, additional, Ohashi, Kenji, additional, Plötz, Per-Arno, additional, Monti, Filippo, additional, Kelly, John M., additional, Keane, Páraic, additional, Gibson, Elizabeth, additional, Lemercier, Gilles, additional, Ruggi, Albert, additional, Cucinotta, Fabio, additional, Gust, Devens, additional, Bradberry, Samuel, additional, Vos, Johannes, additional, Pistolis, George, additional, Mauro, Matteo, additional, Tuite, Eimer, additional, De Cola, Luisa, additional, Ceroni, Paola, additional, Maneiro, Marcelino, additional, Galoppini, Elena, additional, and Gunnlaugsson, Thorfinnur, additional

Published
2015
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