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Université de Fribourg

Morphology, molecular phylogeny, and ecology of Binucleata daphniae n. g., n. sp. (Fungi: Microsporidia), a parasite of Daphnia magna Straus, 1820 (Crustacea: Branchiopoda)

Refardt, Dominik ; Decaestecker, Ellen ; Johnson, Pieter T. J. ; Vávra, Jirí

In: Journal of Eukaryotic Microbiology, 2008, vol. 55, no. 5, p. 393 - 408

We describe a new microsporidian species Binucleata daphniae, n. g., n. sp., that infects the integument cells lining the hemocoele cavity of the carapace and the postabdomen of the cladoceran Daphnia magna Straus. Infected cells filled with spores accumulate as large clusters in the carapace cavity and heavily infected hosts are detected by their opaque appearance. Despite the parasite's...

Université de Fribourg

Admixture as the basis for genetic mapping

Buerkle, C. Alex ; Lexer, Christian

In: Trends in Ecology & Evolution, 2008, vol. 23, no. 12, p. 686-694

Genetic mapping in natural populations is increasing rapidly in feasibility and accessibility. As with many areas in genetics, advances in molecular techniques and statistics are drastically altering how we can investigate inheritance in wild organisms. For ecology and evolution, this is particularly significant and promising, because many of the organisms of interest are not amenable to...

Université de Fribourg

Le chèque-formation: une solution pour favoriser l'engagement en formation des personnes faiblement qualifiées?

Lambert, Marie ; Monbaron, Jacqueline (Dir.) ; Gurtner, Jean-Luc (Codir.)

Mémoire de master : Université de Fribourg, 2007.

De nos jours, toutes les sphères de la vie de l’adulte sont touchées par des évolutions rapides et des innovations incessantes. Dès lors, la nécessité pour tous de s’engager en formation continue apparaît comme particulièrement importante. En effet, les programmes de formation permettent aux participants d’acquérir les savoirs, les compétences et les attitudes nécessaires pour...

Université de Fribourg

Benzothiadiazole affects the leaf proteome in arctic bramble (Rubus arcticus)

Hukkanen, Anne ; Kokko, Harri ; Buchala, Antony ; Häyrinen, Jukka ; Kärenlampi, Sirpa

In: Molecular Plant Pathology, 2008, vol. 9, no. 6, p. 799 - 808

Benzothiadiazole (BTH) induces resistance to the downy mildew pathogen, Peronospora sparsa, in arctic bramble, but the basis for the BTH-induced resistance is unknown. Arctic bramble cv. Mespi was treated with BTH to study the changes in leaf proteome and to identify proteins with a putative role in disease resistance. First, BTH induced strong expression of one PR-1 protein isoform, which was...

Université de Fribourg

Structure of heat-induced β-lactoglobulin aggregates and their complexes with sodium-sodecyl sulfate

Jung, Jin-Mi ; Savin, Gabriela ; Pouzot, Matthieu ; Schmitt, Christophe ; Mezzenga, Raffaele

In: Biomacromolecules, 2008, vol. 9, no. 9, p. 2477–2486

We report on the conformation of heat-induced bovine β-lactoglobulin (βlg) aggregates prepared at different pH conditions, and their complexes with model anionic surfactants such as sodium dodecyl sulfate (SDS). The investigation was carried out by combining a wide range of techniques such as ultra small angle light scattering, static and dynamic light scattering, small angle neutron...

Université de Fribourg

Direct imaging of nanoscopic plastic deformation below bulk Tg and chain stretching in temperature-responsive block copolymer hydrogels by Cryo-TEM

Nykänen, Antti ; Nuopponen, Markus ; Hiekkataipale, Panu ; Hirvonen, Sami-Pekka ; Soininen, Antti ; Tenhu, Heikki ; Ikkala, Olli ; Mezzenga, Raffaele

In: Macromolecules, 2008, vol. 41, no. 9, p. 3243–3249

This work describes the thermoresponsive transition in polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrene (PS-block-PNIPAM-block-PS) triblock copolymer hydrogels, as observed by both direct and reciprocal space in-situ characterization. The hydrogel morphology was studied in both the dry and wet state, at temperatures below and beyond the coil−globule transition of PNIPAM, using...

Université de Fribourg

Poly(ethylene imine)-controlled Calcium Phosphate mineralization

Shkilnyy, Andriy ; Friedrich, Alwin ; Tiersch, Brigitte ; Schöne, Stefanie ; Fechner, Mabya ; Koetz, Joachim ; Schläpfer, Carl-Wilhelm ; Taubert, Andreas

In: Langmuir, 2008, vol. 24, no. 5, p. 2102–2109

The current paper shows that poly(ethylene imine) (PEI) is an efficient template for the fabrication of spherical calcium phosphate (CaP)/polymer hybrid particles at pH values above 8. The polymer forms spherical entities, which contain one or a few CaP particles with diameters of ca. 6 nm. The samples contain up to 20 wt % polymer, which appears to be wrapped around the small CaP particles. The...

Université de Fribourg

Pseudomonas syringae Elicits Emission of the Terpenoid (E,E)-4,8,12-Trimethyl-1,3,7,11-Tridecatetraene in Arabidopsis Leaves Via Jasmonate Signaling and Expression of the Terpene Synthase TPS4

Attaran, Elham ; Rostás, Michael ; Zeier, Jürgen

In: Molecular Plant-Microbe Interactions, 2008, vol. 21, no. 11, p. 1482-1497

Volatile, low–molecular weight terpenoids have been implicated in plant defenses, but their direct role in resistance against microbial pathogens is not clearly defined. We have examined a possible role of terpenoid metabolism in the induced defense of Arabidopsis thaliana plants against leaf infection with the bacterial pathogen Pseudomonas syringae. Inoculation of plants with...

Université de Fribourg

Habitat differentiation in the threatened aquatic plant genus Baldellia (L.) Parl. (Alismataceae): Implications for conservation

Kozlowski, Gregor ; Matthies, Diethart

In: Aquatic Botany, 2009, vol. 90, no. 2, p. 110-118

A comparative analysis of the habitats of Baldellia ranunculoides (subsp. ranunculoides and subsp. repens) and Baldellia alpestris (Alismataceae) was carried out across central and western Europe. Soil samples from 43 populations were analyzed and the composition of accompanying vegetation was analyzed by canonical correspondence and indicator species analysis....