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Bibliothèque cantonale jurassienne

Changing Oligocene climate recorded by palynomorphs from two glacio-eustatic sedimentary cycles, Cape Roberts project, Victoria Land basin, Antarctica

Prebble, J.G. ; Hannah, M.J.

In: Palaeogeography, palaeoclimatology, palaeoecology : an international journal for the geo-sciences, 2006, vol. 231, p. 58

Université de Fribourg

Testing the Evolution of Increased Competitive Ability (EICA) hypothesis in a novel framework

Handley, Richard J. ; Steinger, Thomas ; Treier, Urs A. ; Müller-Schärer, Heinz

In: Ecology, 2008, vol. 89, no. 2, p. 407–417

The “evolution of increased competitive ability” (EICA) hypothesis proposes that escape from natural enemies, e.g., after transcontinental introductions, alters the selection regime because costly defenses no longer enhance fitness. Such an evolutionary loss of defenses enables resources to be directed toward growth or other traits improving performance. We tested the EICA hypothesis in a...

Université de Fribourg

CWH43 is required for the introduction of ceramides into GPI anchors in Saccharomyces cerevisiae

Ghugtyal, Vikram ; Vionnet, Christine ; Roubaty, Carole ; Conzelmann, Andreas

In: Molecular Microbiology, 2007, vol. 65, no. 6, p. 1493-1502

After glycosylphosphatidylinositols (GPIs) are added to GPI proteins of Saccharomyces cerevisiae, the fatty acid in sn-2 of the diacylglycerol moiety can be replaced by a C26:0 fatty acid by a deacylation–reacylation cycle catalysed by Per1p and Gup1p. Furthermore the diacylglycerol moiety of the yeast GPI anchor can also be replaced by ceramides. CWH43 of yeast is...

Université de Fribourg

Evidence of climatic niche shift during biological invasion

Broennimann, Olivier ; Treier, Urs A. ; Müller-Schärer, Heinz ; Thuiller, W. ; Peterson, A. T. ; Guisan, Antoine

In: Ecology Letters, 2007, vol. 10, no. 8, p. 701-709

Niche-based models calibrated in the native range by relating species observations to climatic variables are commonly used to predict the potential spatial extent of species’ invasion. This climate matching approach relies on the assumption that invasive species conserve their climatic niche in the invaded ranges. We test this assumption by analysing the climatic niche spaces of Spotted...

Université de Fribourg

A two-step method for the introduction of single or multiple defined point mutations into the genome of Saccharomyces cerevisiae

Toulmay, Alexandre ; Schneiter, Roger

In: Yeast, 2006, vol. 23, no. 11, p. 825-831

The introduction of defined mutations into open reading frames (ORF) or non-translated regions of the genome is important to study of the structure-function relationship of amino acid residues in proteins or that of sequence motifs at the genome level. We describe a simple two-step method for the introduction of defined single or multiple point mutations into the genome of Saccharomyces...

Università della Svizzera italiana

Design & trust as key factors for e-teaching

Botturi, Luca ; Inglese, Terry ; Rozalèn, Sabrina

In: Proceedings of SITE 2003, Albuquerque, New Mexico, USA, 2003, vol. 1, p. 1379

The offer of new possibilities for teaching and learning with new media increase the complexity of educational environments. This fact consequently increments the possibility of negative learning outcomes, and makes the development of student-instructor trust more difficult. The design of procedures for learning activities may decrease s complexity by guiding students in the use of complex...

Université de Fribourg

Climatic change: possible impacts on human health

Beniston, Martin

In: Swiss Medical Weekly, 2002, vol. 25-26, p. 329

This paper addresses a number of problems relating climatic change and human health. Following an introduction that outlines the over-arching issues, a short summary is given on climatic change and its anthropogenic causes. The rest of the paper then focuses on the direct and indirect impacts of global climatic change on health. Direct effects comprise changes in the hygrothermal stress response...

Université de Fribourg

Tracing the decision maker

Schulte-Mecklenbeck, Michael ; Huber, Oswald (Dir.) ; Kühberger, Anton (Codir.)

Thèse de doctorat : Université de Fribourg, 2005.

This thesis focuses on two themes: a methodological and a decision making one. The methodological part introduces the development of a computerized information search tool. The program, called WebDiP (Web Decision Processes), enables the researcher to track participants while they are searching for information in a database. An experiment can be done either in the laboratory or on the Web. The...

Università della Svizzera italiana

E2ML : Educational Environment Modeling Language

Botturi, Luca ; Colombetti, Marco (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2003 ; 2003COM001.

This study moves from the consideration of the communication dynamics within the instructional design practice. With the introduction of electronic media, the design of educational environments in Higher Education has ceased to be a craftsmanship activity, and has acquired some features proper of mass production. This makes communication a more and more critical issue in design. The original goal...