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See detailCold DUst around NEarby Stars (DUNES). First results. A resolved exo-Kuiper belt around the solar-like star ζ2 Ret
Eiroa, C.; Fedele, D.; Maldonado, J. et al

in Astronomy and Astrophysics (2010), 518

We present the first far-IR observations of the solar-type stars δ Pav, HR 8501, 51 Peg and ζ2 Ret, taken within the context of the DUNES Herschel open time key programme (OTKP). This project uses the ... [more ▼]

We present the first far-IR observations of the solar-type stars δ Pav, HR 8501, 51 Peg and ζ2 Ret, taken within the context of the DUNES Herschel open time key programme (OTKP). This project uses the PACS and SPIRE instruments with the objective of studying infrared excesses due to exo-Kuiper belts around nearby solar-type stars. The observed 100 μm fluxes from δ Pav, HR 8501, and 51 Peg agree with the predicted photospheric fluxes, excluding debris disks brighter than Ldust/ ~ 5 × 10-7 (1σ level) around those stars. A flattened, disk-like structure with a semi-major axis of ~100 AU in size is detected around ζ2 Ret. The resolved structure suggests the presence of an eccentric dust ring, which we interpret as an exo-Kuiper belt with Ldust/ ≈ 10-5. [less ▲]

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See detailCold enzymes : a hot topic
Gerday, Charles ULg; Aittaleb, M.; Arpigny, J. L. et al

in Margesin, R.; Schinner, F. (Eds.) Cold-adapted Organisms : Ecology, Physiology, Enzymology and Molecular Biology (1999)

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See detailCold injuries.
PIERARD, Gérald ULg; QUATRESOOZ, Pascale ULg; FRANCHIMONT, Claudine ULg

in Goldsmith, L.; Gilchrest, B; Katz, S (Eds.) et al Fitzpatrick's Dermatology in General Medicine (2012)

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See detailA cold love story
Feller, Georges ULg

Conference (1997)

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See detailCold Roll Forming and Metal Cutting Simulation using a 3D Arbitrary Lagrangian Eulerian Formulation
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in de Saxcé, Géry; Moës, Nicolas (Eds.) Modeling in Mechanical and Civil Engineering : Collection of Papers from Prof. Nguyen Dang Hung's former students (2006)

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See detailCold three-level atom micromaser in the far-detuning regime
Martin, John ULg; Bastin, Thierry ULg

in Physical Review. A (2007), 75

We analyze the quantum theory of the two-mode micromaser pumped by cold three-level atoms with a Lambda-configuration under the two-photon resonance condition. We focus more specifically on the large ... [more ▼]

We analyze the quantum theory of the two-mode micromaser pumped by cold three-level atoms with a Lambda-configuration under the two-photon resonance condition. We focus more specifically on the large detuning limit where the detuning between the two cavity mode frequencies and the two atomic transition frequencies is large in comparison with the atom-cavity coupling constants. We show that this regime can mimic a virtual two-level atom micromaser without spontaneous emission where the cavity acts for the atoms as a potential barrier or a potential well (depending on the sign of the detuning) and a zero potential but no more both as a potential barrier and a potential well as it is the case for the usual cold two-level atom micromaser [M. O. Scully, G. M. Meyer, and H. Walther, Phys. Rev. Lett. 76, 4144 (1996)]. This introduces interesting options for engineering the interaction between the cold atoms and the cavity. The elimination of the spontaneous emission solves a major issue of the conventional cold two-level atom micromaser as the transit time of cold atoms inside and in the vicinity of the cavity is usually much larger than the atomic level lifetimes. It is also shown that the cold atom regime is very sensitive to the sign of the detuning (in contrast to the hot atom regime) and that, according to this sign, the cavity may speed up or slow down the incident three-level atoms after their interaction with the field. [less ▲]

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See detailThe Cold-Active M1 Aminopeptidase from the Arctic Bacterium Colwellia psychrerythraea
Bauvois, Cédric; Huston, Adrienne; Feller, Georges ULg

in Rawlings, Neil D.; Salvesen, Guy S. (Eds.) Handbook of Proteolytic Enzymes (Third Ed) (2013)

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See detailCold-Adapted Beta-Galactosidase from the Antarctic Psychrophile Pseudoalteromonas Haloplanktis
Hoyoux, A.; Jennes, I.; Dubois, P. et al

in Applied and Environmental Microbiology (2001), 67(4), 1529-35

The beta-galactosidase from the Antarctic gram-negative bacterium Pseudoalteromonas haloplanktis TAE 79 was purified to homogeneity. The nucleotide sequence and the NH(2)-terminal amino acid sequence of ... [more ▼]

The beta-galactosidase from the Antarctic gram-negative bacterium Pseudoalteromonas haloplanktis TAE 79 was purified to homogeneity. The nucleotide sequence and the NH(2)-terminal amino acid sequence of the purified enzyme indicate that the beta-galactosidase subunit is composed of 1,038 amino acids with a calculated M(r) of 118,068. This beta-galactosidase shares structural properties with Escherichia coli beta-galactosidase (comparable subunit mass, 51% amino sequence identity, conservation of amino acid residues involved in catalysis, similar optimal pH value, and requirement for divalent metal ions) but is characterized by a higher catalytic efficiency on synthetic and natural substrates and by a shift of apparent optimum activity toward low temperatures and lower thermal stability. The enzyme also differs by a higher pI (7.8) and by specific thermodynamic activation parameters. P. haloplanktis beta-galactosidase was expressed in E. coli, and the recombinant enzyme displays properties identical to those of the wild-type enzyme. Heat-induced unfolding monitored by intrinsic fluorescence spectroscopy showed lower melting point values for both P. haloplanktis wild-type and recombinant beta-galactosidase compared to the mesophilic enzyme. Assays of lactose hydrolysis in milk demonstrate that P. haloplanktis beta-galactosidase can outperform the current commercial beta-galactosidase from Kluyveromyces marxianus var. lactis, suggesting that the cold-adapted beta-galactosidase could be used to hydrolyze lactose in dairy products processed in refrigerated plants. [less ▲]

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See detailCold-Adapted Enzymes
Collins, T.; D'Amico, Salvino ULg; Marx, J. C. et al

in Gerday, Charles; Glansdorff, N. (Eds.) Physiology and biochemistry of extremophiles (2007)

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See detailCold-adapted enzymes
Georlette, D.; Bentahir, M.; Claverie, P. et al

in Bulte, J.; DeCuyper, M. (Eds.) Focus on Biotechnology – Physics and Chemistry Basis for Biotechnology (2001)

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See detailCold-adapted enzymes from marine antarctic microorganisms
Marx, J. C.; Collins, T.; D'Amico, Salvino ULg et al

in Marine Biotechnology (2007), 9(3, May-Jun), 293-304

The Antarctic marine environment is characterized by challenging conditions for the survival of native microorganisms. Indeed, next to the temperature effect represented by the Arrhenius law, the ... [more ▼]

The Antarctic marine environment is characterized by challenging conditions for the survival of native microorganisms. Indeed, next to the temperature effect represented by the Arrhenius law, the viscosity of the medium, which is also significantly enhanced by low temperatures, contributes to slow down reaction rates. This review analyses the different challenges and focuses on a key element of life at low temperatures: cold-adapted enzymes. The molecular characteristics of these enzymes are discussed as well as the adaptation strategies which can be inferred from the comparison of their properties and three-dimensional structures with those of their mesophilic counterparts. As these enzymes display a high specific activity at low and moderate temperatures associated with a relatively high thermosensitivity, the interest in these properties is discussed with regard to their current and possible applications in biotechnology. [less ▲]

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See detailCold-adapted enzymes: an unachieved symphony
D'Amico, Salvino ULg; Claverie, P.; Collins, T. et al

in Storey, K. B.; Storey, J. M. (Eds.) Cell and Molecular Responses to Stress vol.2. Protein adaptations and signal transduction, (2001)

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See detailCold-Adapted Enzymes: From Fundamentals to Biotechnology
Gerday, Charles ULg; Aittaleb, Mohamed; Bentahir, Mostafa et al

in Trends in Biotechnology (2000), 18(3), 103-7

Psychrophilic enzymes produced by cold-adapted microorganisms display a high catalytic efficiency and are most often, if not always, associated with high thermosensitivity. Using X-ray crystallography ... [more ▼]

Psychrophilic enzymes produced by cold-adapted microorganisms display a high catalytic efficiency and are most often, if not always, associated with high thermosensitivity. Using X-ray crystallography, these properties are beginning to become understood, and the rules governing their adaptation to cold appear to be relatively diverse. The application of these enzymes offers considerable potential to the biotechnology industry, for example, in the detergent and food industries, for the production of fine chemicals and in bioremediation processes. [less ▲]

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See detailCold-adapted microorganisms: adaptation strategies and biotechnological potential
Margesin, R.; Feller, Georges ULg; Gerday, Charles ULg et al

in Bitton, G. (Ed.) The Encyclopedia of Environmental Microbiology, vol. 2 (2002)

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See detailThe cold-adapted trigger factor from the Antarctic bacterium Pseudoalteromonas haloplanktis.
D'Amico, Salvino; Piette, Florence; Leprince, Pierre ULg et al

Poster (2008)

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See detailCold-adapted xylanases: from Antarctica to the table.
Collins, Tony; Georis, Jacques; Dauvrin, Thierry et al

Poster (2006)

Detailed reference viewed: 12 (0 ULg)