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Université de Neuchâtel

The oceanic mantle as an important repository for the light elements Li, Be and B

Pelletier, Laure ; Kalt, Angelika (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.1988.

It is important to quantify the Li, Be and B content of oceanic peridotites, in order to evaluate their contributions to the light element input in subduction zones (compared to oceanic crust). In previous studies, the input related to oceanic mantle was usually neglected, because no strong data are available for the light element contents (minerals, whole rock samples). The objective of this...

Université de Neuchâtel

Use of natural and artificial reactive tracers to investigate the transfer of solutes in karst systems

Savoy, Ludovic ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1985.

Numerous studies in unconsolidated aquifers have shown that natural attenuation, mainly due to biodegradation, can substantially reduce the contaminant mass in an aquifer. Much less is known about the relevance of natural attenuation in karst aquifers. This project investigated the potential for attenuation of dissolved compounds by biodegradation in the karst unsaturated zone. To what extent...

Université de Fribourg

Different vascular smooth muscle cell apoptosis in the human internal mammary artery and the saphenous vein: implications for bypass graft disease

Frischknecht, Karin ; Greutert, Helen ; Weisshaupt, Christian ; Kaspar, Mathias ; Yang, Zhihong ; Lüscher, Thomas F. ; Carrel, Thierry P. ; Tanner, Felix C.

In: Journal of Vascular Research, 2006, vol. 43, no. 4, p. 338-346

The remarkable patency of internal mammary artery (MA) grafts compared to saphenous vein (SV) grafts has been related to different biological properties of the two blood vessels. We examined whether proliferation and apoptosis of vascular smooth muscle cells (VSMC) from human coronary artery bypass vessels differ according to patency rates. Methods and Results: Proliferation rates to serum...

Université de Neuchâtel

Longitudinally polarized fields in near-field imaging systems

Descrovi, Emiliano ; Herzig, H.-P. (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2005 ; 1851.

he evolution path of nanotechnologies moves through the domain of microscopy. Among all the kinds of imaging tools available today, optical imaging systems are of primary importance. When using optical imaging systems, we take profit of the information remotely delivered by light to the detector, after interaction with the sample. Nevertheless, as light moves away from the place of interaction, a...

Université de Fribourg

Statins prevent pulsatile stretch-induced proliferation of human saphenous vein smooth muscle cells via inhibition of Rho/Rho-kinase pathway

Kozaia, Toshiyuki ; Eto, Masato ; Yang, Zhihong ; Shimokawa, Hiroaki ; Lüscher, Thomas F.

In: Cardiovascular Research, 2005, vol. 68, p. 475 – 482

Objective: Pulsatile forces regulate vascular remodeling and trigger vascular diseases such as saphenous vein graft disease. The saphenous vein is exposed to high pressure and pulsatility only after implantation. Statins have been proved to reduce the incidence of vein graft failure. Thus, we investigated the molecular mechanisms of pulsatile stretch-induced saphenous vein smooth muscle...

Université de Neuchâtel

An Eocene paleodoline in the Morcles Nappe of Anzeindaz (Canton of Vaud, Switzerland)

Linder, Pascal

In: Eclogae Geologicae Helvetiae, 2005, vol. 98, p. 51-61

Eozäne Sedimente in der helvetischen Morcles-Decke von Anzeindaz (Kanton Waadt, Schweiz) dokumentieren die Wanderung der “Forebulge” und des Vorlandbeckens der entstehenden Alpen. Über kreidezeitlichen Sedimenten folgt die sehr bedeutende erosive Diskordanz der “siderolithischen” Emersionsphase. Diese langanhaltende, durch die Anwesenheit der “Forebulge” bedingte Phase kontinentaler...

Université de Neuchâtel

Feasibility study of the geoelectric structure of the Araguainha impact, Brazil

Schnegg, Pierre-André ; Fontes, S. L.

In: Earth, Planets and Space, 2002, vol. 54, p. 597-606

We have re-examined the modelling of magnetotelluric and GDS soundings carried out on the Araguainha Dome, Brazil, published a few years ago, in the light of a new modelling method and with particular stress on the induction of the vertical component of the magnetic field, which had been neglected in the early publications. By careful selection of the period range of the measured data, we obtain...

Université de Fribourg

Nitric oxide synthase gene transfer inhibits biological features of bypass graft disease in the human saphenous vein

Tanner, Felix C. ; Largiadèr, Thomas ; Greutert, Helen ; Yang, Zhihong ; Lüscher, Thomas F.

In: Journal of Thoracic and Cardiovascular Surgery, 2004, vol. 127(1), p. 20

Background Bypass graft disease is related to proliferation and migration of vascular smooth muscle cells and to platelet activation with thrombus formation. Nitric oxide inhibits these biological responses; it has never been demonstrated, however, whether this occurs in intact human vascular tissue after endothelial nitric oxide synthase gene transfer. Methods We examined whether endothelial...