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Université de Neuchâtel

Microbial lithification in marine stromatolites and hypersaline mats

Dupraz, Christophe ; Visscher, Pieter T.

In: Trends in Microbiology, 2005, vol. 13, p. 429-438

Lithification in microbial ecosystems occurs when precipitation of minerals outweighs dissolution. Although the formation of various minerals can result from microbial metabolism, carbonate precipitation is possibly the most important process that impacts global carbon cycling. Recent investigations have produced models for stromatolite formation in open marine environments and lithification in...

Université de Neuchâtel

Origin of the current stress field in the western/central Alps : role of gravitational re-equilibration constrained by numerical modeling

Delacou, Bastien ; Sue, Christian ; Champagnac, Jean-Daniel ; Burkhard, Martin

In: Deformation Mechanisms, Rheology and Tectonics : from Minerals to the Lithosphere, 2005, vol. 243, p. 295-310

We interpret the strain and stress fields of the western / central Alpine arc on the basis of 2.5D finite element modelling and a recent seismotectonic synthesis. Models have fixed boundary forces and different crustal geometries, so that they respond to buoyancy forces (variations in gravitational potential energies). The seismotectonic regime, characterized by orogen-perpendicular extension in...

Université de Neuchâtel

Tectonics of the Anti-Atlas of Morocco

Burkhard, Martin ; Caritg, Séverine ; Helg, Urs ; Robert-Charrue, Charles ; Soulaimani, Abderrahmane

In: Comptes Rendus Geosciences, 2006, vol. 338, p. 11-24

The Anti-Atlas is reviewed and examined in the light of its geodynamic significance as a Palaeozoic basin and fold belt. Shortening is accommodated by polyharmonic buckle folding of the cover in a thick-skinned fashion without the development of any significant thrust/duplex systems. The Anti-Atlas is heavily inverted deep intracratonic basin, rather than a former passive margin of the...

Université de Neuchâtel

Brittle orogen-parallel extension in the internal zones of the Swiss Alps (South Valais)

Champagnac, Jean-Daniel ; Sue, Christian ; Delacou, Bastien ; Burkhard, Martin

In: Eclogae Geologicae Helvetiae, 2003, vol. 96, p. 1-14

The latest Alpine faulting is examined in the Valais region of the Swiss Alps. We used satellite imagery and a 25m Digital Elevation Model to identify and map geomorphic features such as fault scarps and lineaments. Verification, fault characterization and fault planes / striae measurements for paleostress analysis were conducted in the field. We identified three fault families that post-date...

Università della Svizzera italiana

Regional public health care spending in Switzerland : an empirical analysis

Crivelli, Luca ; Filippini, Massimo

In this study we attempt to explain variations across the Swiss regional states (cantons) in public health care expenditures. The large autonomy of the cantons in the organization and financing of health care services creates strong heterogeneity. Per capita public expenditures in health care are assumed to depend on the median tax share, intergovernmental grants, and some structural factors. The...

Université de Neuchâtel

Irregular earthquake cycle along the southern Tianshan front, Aksu area, China

Hubert-Ferrari, Aurélia ; Suppe, John ; Van Der Woerd, Jerome ; Wang, Xin ; Lu, Huafu

In: Journal of Geophysical Research, 2005, vol. 110, p. 1-18

A long deformation record (~16.5 ka) showing nonsteady earthquake recurrence is established for the Aksu thrust (Tianshan, China) on the basis of cosmogenic 10Be dating of faulted surfaces. Topographic leveling across the Aksu fault scarp indicates up to ∼10 m uplift across a moraine abandoned ~16.5 ka and similar uplift of ~6 m across two inset surfaces yielding ages of ~12.5 and ~5 ka....

Université de Neuchâtel

The Destination for Single-Pass Membrane Proteins Is Influenced Markedly by the Length of the Hydrophobic Domain

Brandizzi, Federica ; Frangne, Nathalie ; Marc-Martin, Sophie ; Hawes, Chris ; Neuhaus, Jean-Marc ; Paris, Nadine

In: The Plant Cell, 2002, vol. 14, p. 1077-1092

The tonoplast was proposed as a default destination of membrane-bound proteins without specific targeting signals. To investigate the nature of this targeting, we created type I fusion proteins with green fluorescent protein followed by the transmembrane domain of the human lysosomal protein LAMP1. We varied the length of the transmembrane domain from 23 to either 20 or 17 amino acids by deletion...

Université de Neuchâtel

Sorting of proteins to vacuoles in plant cells

Neuhaus, Jean-Marc ; Rogers, John C.

In: Plant Molecular Biology, 1998, vol. 38, p. 127-144

An individual plant cell may contain at least two functionally and structurally distinct types of vacuoles: protein storage vacuoles and lytic vacuoles. Presumably a cell that stores proteins in vacuoles must maintain these separate compartments to prevent exposure of the storage proteins to an acidified environment with active hydrolytic enzymes where they would be degraded. Thus, the...

Université de Neuchâtel

Regeneration of a Lytic Central Vacuole and of Neutral Peripheral Vacuoles Can Be Visualized by Green Fluorescent Proteins Targeted to Either Type of Vacuoles

Di Sansebastiano, Gian Pietro ; Paris, Nadine ; Marc-Martin, Sophie ; Neuhaus, Jean-Marc

In: Plant Physiology, 2001, vol. 126, p. 78-86

Protein trafficking to two different types of vacuoles was investigated in tobacco (Nicotiana tabacum cv SR1) mesophyll protoplasts using two different vacuolar green fluorescent proteins (GFPs). One GFP is targeted to a pH-neutral vacuole by the C-terminal vacuolar sorting determinant of tobacco chitinase A, whereas the other GFP is targeted to an acidic lytic vacuole by the N-terminal...

Université de Neuchâtel

Demonstration in Yeast of the Function of BP-80, a Putative Plant Vacuolar Sorting Receptor

Humair, David ; Hernández Felipe, Doramys ; Neuhaus, Jean-Marc ; Paris, Nadine

In: Plant Cell, 2001, vol. 13, p. 781-792

BP-80, later renamed VSRPS-1, is a putative receptor involved in sorting proteins such as proaleurain to the lytic vacuole, with its N-terminal domain recognizing the vacuolar sorting determinant. Although all VSRPS-1 characteristics and in vitro binding properties described so far favored its receptor function, this function remained to be demonstrated. Here, we used green...