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See detailAtomic decay data for modeling the Al K-lines
Palmeri, P; Quinet, Pascal ULg; Mendoza, C et al

in Astronomy and Astrophysics (2011), 525

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See detailAtomic force microscopy investigation of the morphology and the biological activity of protein-modified surfaces for bio- and immunosensors
Cecchet, Francesca; Duwez, Anne-Sophie ULg; Gabriel, Sabine ULg et al

in Analytical Chemistry (2007), 79(17), 6488-6495

With the purpose of developing biosensors, the reliable proof of the biological activity of two new sensor systems was obtained by atomic force microscopy (AFM) in both the imaging and the single-molecule ... [more ▼]

With the purpose of developing biosensors, the reliable proof of the biological activity of two new sensor systems was obtained by atomic force microscopy (AFM) in both the imaging and the single-molecule force spectroscopy modes. Antigens or antibodies of pharmacological interest were grafted onto self-assembled monolayers of thiols on gold, and AFM imaging demonstrated that the grafting process produced homogeneous submonolayers of isolated proteins. The analysis of the morphology of the surfaces at the different functionalization steps allowed evaluating the protein grafting density and showed that the recognition of complementary species present in the surrounding solution occurred. Single-molecule force spectroscopy experiments between the sensing surfaces and AFM probes, onto which the complementary species were grafted, enabled a direct and rapid test of the biological activity of the sensors by investigating the interaction occurring at the level of one single ligand-receptor bond. Ellipsometry and surface plasmon resonance allowed further characterization of the sensor surfaces and confirmed that the biological recognition took place. [less ▲]

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See detailAtomic force microscopy of supported lipid bilayers.
Mingeot-Leclercq, Marie*-Paule; Deleu, Magali ULg; Brasseur, Robert ULg et al

in Nature Protocols (2008), 3(10), 1654-9

Supported lipid bilayers (SLBs) are widely used in biophysical research to investigate the properties of biological membranes and offer exciting prospects in nanobiotechnology. Atomic force microscopy ... [more ▼]

Supported lipid bilayers (SLBs) are widely used in biophysical research to investigate the properties of biological membranes and offer exciting prospects in nanobiotechnology. Atomic force microscopy (AFM) has become a well-established technique for imaging SLBs at nanometer resolution. A unique feature of AFM is its ability to monitor dynamic processes, such as the interaction of bilayers with proteins and drugs. Here, we present protocols for preparing dioleoylphosphatidylcholine/dipalmitoylphosphatidylcholine (DOPC/DPPC) bilayers supported on mica using small unilamellar vesicles and for imaging their nanoscale interaction with the antibiotic azithromycin using AFM. The entire protocol can be completed in 10 h. [less ▲]

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See detailAtomic layer doping of phosphorus and arsenic: experimental and atomistic modeling
Takeuchi, Shotaro; Yang, Lijun; Nguyen, Ngoc Duy ULg et al

Poster (2008)

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See detailAtomic Lifetimes and Transition Probabilities in Boron-like (Na VII) and Beryllium-like (Na VIII) Sodium Ions
Tordoir, Xavier ULg; Biémont, Emile ULg; Garnir, Henri-Pierre ULg et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (1999), 6

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See detailAtomic Lifetimes of n=2 Levels of Boron-like Na
Tordoir, Xavier ULg; Biémont, Emile ULg; Garnir, Henri-Pierre ULg et al

Conference (1998, August)

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See detailAtomic oxygen distribution in the Venus mesosphere from observations of O[SUB]2[/SUB] infrared airglow by VIRTIS-Venus Express
Gérard, Jean-Claude ULg; Saglam, Adem ULg; Piccioni, Giuseppe et al

in Icarus (2009), 199

This VIRTIS instrument on board Venus Express has collected spectrally resolved images of the Venus nightside limb that show the presence of the (0,0) band of the Deltag1-->Sigmag3 infrared atmospheric ... [more ▼]

This VIRTIS instrument on board Venus Express has collected spectrally resolved images of the Venus nightside limb that show the presence of the (0,0) band of the Deltag1-->Sigmag3 infrared atmospheric system of O[SUB]2[/SUB] at 1.27 mum. The emission is produced by three-body recombination of oxygen atoms created by photodissociation of CO[SUB]2[/SUB] on the dayside. It is consistently bright so that emission limb profiles can be extracted from the images. The vertical distribution of O[SUB]2[/SUB](Deltag1) may be derived following Abel inversion of the radiance limb profiles. Assuming photochemical equilibrium, it is combined with the CO[SUB]2[/SUB] vertical distribution to determine the atomic oxygen density. The uncertainties on the O density caused by the Abel inversion reach a few percent at the peak, increasing to about 50% near 120 km. We first analyze a case when the CO[SUB]2[/SUB] density was derived from a stellar occultation observed with the SPICAV spectrometer simultaneously with an image of the O[SUB]2[/SUB] limb airglow. In other cases, an average CO[SUB]2[/SUB] profile deduced from a series of ultraviolet stellar occultations is used to derive the O profile, leading to uncertainties on the O density less than 30%. It is found that the maximum O density is generally located between 94 and 115 km with a mean value of 104 km. It ranges from less than 1×10[SUP][/SUP] to about 5×10[SUP][/SUP] cm[SUP][/SUP] with a global mean of 2.2×10[SUP][/SUP] cm[SUP][/SUP]. These values are in reasonable agreement with the VIRA midnight oxygen profile. The vertical O distribution is generally in good agreement with the oxygen profile calculated with a one-dimensional chemical-diffusive model. No statistical latitudinal dependence of the altitude of the oxygen peak is observed, but the maximum O density tends to decrease with increasing northern latitudes. The latitudinal distribution at a given time exhibits large variations in the O density profile and its vertical structure. The vertical oxygen distribution frequently shows multiple peaks possibly caused by waves or variations in the structure of turbulent transport. It is concluded that the O[SUB]2[/SUB] infrared night airglow is a powerful tool to map the distribution of atomic oxygen in the mesosphere between 90 and 115 km and improve future Venus reference atmosphere models. [less ▲]

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See detailAtomic oxygen distributions in the Venus thermosphere: Comparisons between Venus Express observations and global model simulations
Brecht, A.; Bougher, S. W.; Gérard, Jean-Claude ULg et al

in Icarus: International Journal of Solar System Studies (2011)

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See detailAtomic oxygen on the Venus nightside: Global distribution deduced from airglow mapping
Soret, Lauriane ULg; Gérard, Jean-Claude ULg; Montmessin, Franck et al

in Icarus: International Journal of Solar System Studies (2012), 217

The Visible and Infra-Red Thermal Imaging Spectrometer (VIRTIS) instrument on board the Venus Express spacecraft has measured the O2(a1[Delta]) nightglow distribution at 1.27 [mu]m in the Venus mesosphere ... [more ▼]

The Visible and Infra-Red Thermal Imaging Spectrometer (VIRTIS) instrument on board the Venus Express spacecraft has measured the O2(a1[Delta]) nightglow distribution at 1.27 [mu]m in the Venus mesosphere for more than two years. Nadir observations have been used to create a statistical map of the emission on Venus nightside. It appears that the statistical 1.6 MR maximum of the emission is located around the antisolar point. Limb observations provide information on the altitude and on the shape of the emission layer. We combine nadir observations essentially covering the southern hemisphere, corrected for the thermal emission of the lower atmosphere, with limb profiles of the northern hemisphere to generate a global map of the Venus nightside emission at 1.27 [mu]m. Given all the O2(a1[Delta]) intensity profiles, O2(a1[Delta]) and O density profiles have been calculated and three-dimensional maps of metastable molecular and atomic oxygen densities have been generated. This global O density nightside distribution improves that available from the VTS3 model, which was based on measurements made above 145 km. The O2(a1[Delta]) hemispheric average density is 2.1 × 109 cm-3, with a maximum value of 6.5 × 109 cm-3 at 99.2 km. The O density profiles have been derived from the nightglow data using CO2 profiles from the empirical VTS3 model or from SPICAV stellar occultations. The O hemispheric average density is 1.9 × 1011 cm-3 in both cases, with a mean altitude of the peak located at 106.1 km and 103.4 km, respectively. These results tend to confirm the modeled values of 2.8 × 1011 cm-3 at 104 km and 2.0 × 1011 cm-3 at 110 km obtained by Brecht et al. [Brecht, A., Bougher, S.W., Gérard, J.-C., Parkinson, C.D., Rafkin, S., Foster, B., 2011a. J. Geophys. Res., in press] and Krasnopolsky [Krasnopolsky, V.A., 2010. Icarus 207, 17-27], respectively. Comparing the oxygen density map derived from the O2(a1[Delta]) nightglow observations, it appears that the morphology is very different and that the densities obtained in this study are about three times higher than those predicted by the VTS3 model. [less ▲]

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See detailAtomic Spectroscopy in the Infrared
Biémont, Emile ULg

in Rabin, D.; Jefferies, J. (Eds.) Infrared Solar Physics (1994)

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See detailAtomic structure calculations and Beam-foil observations of La IV
Biémont, Emile ULg; Clar, M.; Enzonga Yoca, S. et al

in Canadian Journal of Physics (2009), 87

Relativistic Hartree–Fock and multiconfigurational Dirac–Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La3+, Z = 57). The calculations have ... [more ▼]

Relativistic Hartree–Fock and multiconfigurational Dirac–Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La3+, Z = 57). The calculations have to cope with configuration interaction effects but also with the very complex situation of the collapse of the 4f wave function. The calculations are compared to experimental data obtained with beam-foil spectroscopy in the extreme ultraviolet, at ion energies that favour <br />the production of the spectrum La IV. Besides lines known from sliding spark discharges, many more lines are observed that have not yet been identified. Time-resolved measurements yield three level lifetimes in La IV that agree roughly with the results of our own calculations. [less ▲]

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See detailAtomic structure of the Te/Si(100)-2x1 surface
Wiame, Frédéric; Dumont, Jacques; Sporken, Robert et al

in Physical Review. B : Condensed Matter (2005), 72

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See detailATOMIC STRUCTURES OF HEAVY ELEMENTS : RECENT PROGRESS AND PERSPECTIVES
Biémont, Emile ULg; Fivet, V.; Palmeri, P. et al

Conference (2008)

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions ... [more ▼]

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions, Landé factors) in heavy ions. We also emphasize the difficulties that are frequently met in the field and that sometimes prevent obtaining accurate atomic data for the transitions of astrophysical interest. We concentrate particularly on the determination of radiative parameters for selected rare-earth (RE) ions (lanthanides and actinides) and for some atoms and ions of the sixth row of the periodic table. [less ▲]

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See detailAtomic transition probabilities in Bi II
Palmeri, P.; Quinet, Pascal ULg; Biémont, Emile ULg

in Physica Scripta (2001), 63

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See detailAtomically precise interfaces from non-stoichiometric deposition
Nie, Y. F.; Zhu, Y.; Lee, C.-H. et al

in Nature Communications (2014), 5

Complex oxide heterostructures display some of the most chemically abrupt, atomically precise interfaces, which is advantageous when constructing new interface phases with emergent properties by ... [more ▼]

Complex oxide heterostructures display some of the most chemically abrupt, atomically precise interfaces, which is advantageous when constructing new interface phases with emergent properties by juxtaposing incompatible ground states. One might assume that atomically precise interfaces result from stoichiometric growth. Here we show that the most precise control is, however, obtained by using deliberate and specific non-stoichiometric growth conditions. For the precise growth of Srnþ1TinOnþ1 Ruddlesden–Popper (RP) phases, stoichiometric deposition leads to the loss of the first RP rock-salt double layer, but growing with a strontium-rich surface layer restores the bulk stoichiometry and ordering of the subsurface RP structure. Our results dramatically expand the materials that can be prepared in epitaxial heterostructures with precise interface control—from just the n¼N end members (perovskites) to the entire RP homologous series—enabling the exploration of novel quantum phenomena at a richer variety of oxide interfaces. [less ▲]

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See detailAtomistic account of structural and dynamical changes induced by small binders in the double helix of a short DNA
Fresch, Barbara ULg; Remacle, Françoise ULg

in Physical Chemistry Chemical Physics [=PCCP] (2014), 16

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See detailAn atomistic view of DNA dynamics and its interaction with small binders: insights from Molecular Dynamics and Principal Component Analysis
Fresch, Barbara ULg; Remacle, Françoise ULg

in Joachim, Christian (Ed.) Advances in Atom and Single Molecule Machines (2015)

DNA oligomers are promising building blocks for the development of bottom-up nano-devices and molecular logic machines. To control and exploit their unique capabilities of self-assembling and molecular ... [more ▼]

DNA oligomers are promising building blocks for the development of bottom-up nano-devices and molecular logic machines. To control and exploit their unique capabilities of self-assembling and molecular recognition a deep understanding of their dynamical properties is essential. We theoretically investigate the dynamics of a DNA dodecamer and its complexes with two common ligands, Hoechst33258 and the ethidium cation, by means of classical Molecular Dynamics (MD) simulations and Principal Component Analysis (PCA). We study the structural relation between the flexibility of the double helix and the binding process. The dynamics of a terminal base pair unbinding is also analysed as an example of process that involves multiple energy minima in the underlying free energy landscape. [less ▲]

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See detailAtomwaffen und die Europaïsche verteidigungsidentität
Dumoulin, André ULg

Report (1996)

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