Detailed characterization of (3X3) iodine adlayer on Pt(111) by unequal-sphere packing model

in JOURNAL OF CHEMICAL PHYSICS (2005), 122(9),

A simple unequal-sphere packing model is applied to study the iodine (3x3) adlayer on the Pt(111) surface. By using a newly introduced parameter, defined as the average adsorbate height, three ... [more ▼]

A simple unequal-sphere packing model is applied to study the iodine (3x3) adlayer on the Pt(111) surface. By using a newly introduced parameter, defined as the average adsorbate height, three characteristic adlattices, (3x3)-sym, (3x3)-asym, and (3x3)-lin, have been selected and characterized in great detail, including the exact adatom registry. The (3x3)-sym iodine adlattice, observed in many experimental studies appears to be, on average, the closest one to the substrate surface. A special contour plot of average adsorbate height vs X and Y positions of the (3x3) iodine unit cell indicates the existence of two local minima which are related to preferential formation of (3x3)-sym and (3x3)-asym iodine adlattices. Our model gives good agreement with experimental findings, and explains the mechanism of preferential appearance of (3x3)-sym and (3x3)-asym structures. (C) 2005 American Institute of Physics. [less ▲]

Organisation, Koordination und Implementierung eines „sozialen Frühwarnsystems für Hückeswagen“ als präventive Maßnahme der sozialräumlichen Planung.

Speeches/Talks (2005)

Wahrnehmung in der Leibphänomenologie: Zur Mehrperspektivität leiblicher Interaktion und sinnlicher Wahrnehmung im Theaterspiel

in Duncker, Ludwig; Sander, Wolfgang; Suhrkamp, Carola (Eds.) Perspektivenvielvalt im Unterricht (2005)

Aktivierungspotential politischer Förderungsprogramme am Beispiel des Bundesmodellprogramms LOS

Speeches/Talks (2005)

On the visibility of electron--electron interaction effects in field emission spectra

in Solid State Communications (2005), 135

One of the most convenient methods to obtain information about the energy distribution function of electrons in conducting materials is the measurement of the energy resolved current $j(\omega)$ in field ... [more ▼]

One of the most convenient methods to obtain information about the energy distribution function of electrons in conducting materials is the measurement of the energy resolved current $j(\omega)$ in field emission (FE) experiments. Its high energy tail $j_>(\omega)$ (above the Fermi edge) contains invaluable information about the nature of the electron--electron interactions inside the emitter. Thus far, $j_>(\omega)$ has been calculated to second order in the tunnelling probability, and it turns out to be divergent toward the Fermi edge for a wide variety of emitters. The extraction of the correlation properties from real experiments can potentially be obscured by the eventually more divergent contributions of higher orders as well as by thermal smearing around $E_F$. We present an analysis of both factors and make predictions for the energy window where only the second order tunnelling events dominate the behaviour of $j_>(\omega)$. We apply our results to the FE from Luttinger liquids and single-wall carbon nanotubes. [less ▲]

Der Bildhunger der Literatur. Festschrift für Gunter E. Grimm

Book published by Königshausen und Neumann (2005)

New hepatic fat activates PPARalpha to maintain glucose, lipid, and cholesterol homeostasis

in Cell Metabolism (2005), 1(5), 309-22

De novo lipogenesis is an energy-expensive process whose role in adult mammals is poorly understood. We generated mice with liver-specific inactivation of fatty-acid synthase (FAS), a key lipogenic enzyme ... [more ▼]

De novo lipogenesis is an energy-expensive process whose role in adult mammals is poorly understood. We generated mice with liver-specific inactivation of fatty-acid synthase (FAS), a key lipogenic enzyme. On a zero-fat diet, FASKOL (FAS knockout in liver) mice developed hypoglycemia and fatty liver, which were reversed with dietary fat. These phenotypes were also observed after prolonged fasting, similarly to fasted PPARalpha-deficiency mice. Hypoglycemia, fatty liver, and defects in expression of PPARalpha target genes in FASKOL mice were corrected with a PPARalpha agonist. On either zero-fat or chow diet, FASKOL mice had low serum and hepatic cholesterol levels with elevated SREBP-2, decreased HMG-CoA reductase expression, and decreased cholesterol biosynthesis; these were also corrected with a PPARalpha agonist. These results suggest that products of the FAS reaction regulate glucose, lipid, and cholesterol metabolism by serving as endogenous activators of distinct physiological pools of PPARalpha in adult liver [less ▲]

Computational methods for the design of effective therapies against drug resistant HIV strains

in Bioinformatics (2005), 21(21), 3943-50

Summary: The development of drug resistance is a major obstacle to successful treatment of HIV infection. The extraordinary replication dynamics of HIV facilitates its escape from selective pressure ... [more ▼]

Summary: The development of drug resistance is a major obstacle to successful treatment of HIV infection. The extraordinary replication dynamics of HIV facilitates its escape from selective pressure exerted by the human immune system and by combination drug therapy. We have developed several computational methods whose combined use can support the design of optimal antiretroviral therapies based on viral genomic data. [less ▲]

Die menschliche Natur und ihre Ethik

in Gattungsethik. Schutz für das Menschengeschlecht ? (2005)

Träge Temperamente. Konstruktion eines Nationenbildes bei Kant

in Heimböckel, Dieter; Werlein, Uwe (Eds.) Der Bildhunger der Literatur (2005)