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Université de Fribourg

Strong contrast in mass and energy balance between a coastal mountain glacier and the Greenland ice sheet

Abermann, Jakob ; As, Dirk Van ; Wacker, Stefan ; Langley, Kirsty ; Machguth, Horst ; Fausto, Robert Schjøtt

In: Journal of Glaciology, 2019, vol. 65, no. 250, p. 263–269

We show a strong difference in surface mass and energy balance of a mountain glacier and two sites on the ice sheet at 64°N in West Greenland using stake and automated weather station observations. Net surface mass balance is on average 2.2 m w.e. less negative at the coast compared with the ice sheet in the same elevation. We find a larger energy turnover at the ice sheet margin on...

Université de Fribourg

A Boundary Property for Upper Domination

AbouEisha, Hassan ; Hussain, Shahid ; Lozin, Vadim ; Monnot, Jérôme ; Ries, Bernard ; Zamaraev, Viktor

In: Lecture Notes in Computer Science, 2016, vol. 9843, p. 229-240

An upper dominating set in a graph is a minimal (with respect to set inclusion) dominating set of maximum cardinality. The problem of finding an upper dominating set is generally NP-hard, but can be solved in polynomial time in some restricted graph classes, such as P4-free graphs or 2K2-free graphs. For classes defined by finitely many forbidden induced subgraphs, the boundary separating...

Université de Fribourg

Upper Domination : Towards a Dichotomy Through Boundary Properties

AbouEisha, Hassan ; Shahid, Hussain ; Lozin, Vadim ; Monnot, Jérôme ; Ries, Bernard ; Zamaraev, Viktor

In: Algorithmica, 2018, vol. 80, no. 10, p. 2799-2817

Anupper dominating set in a graph is a minimal dominating set of maximum cardinality. The problem of finding an upper dominating set is generally NP-hard.We study the complexity of this problem in finitely defined classes of graphs and conjecture that the problem admits a complexity dichotomy in this family. A helpful tool to study the complexity of an algorithmic problem is the notion of...

Université de Fribourg

Feasibility and initial efficacy of a cognitive-behavioural group programme for managing anger and aggressiveness after traumatic brain injury

Aboulafia-Brakha, T. ; Buschbeck, C. Greber ; Rochat, L. ; Annoni, Jean-Marie

In: Neuropsychological Rehabilitation: An International Journal, 2013, vol. 23, no. 2, p. 216-233

This study assesses the feasibility of a cognitive-behavioural group programme for treating anger and aggressiveness after a traumatic brain injury (TBI). Five feasibility criteria were considered: demand, implementation, practicality, acceptability and initial efficacy. A self-report questionnaire of aggressiveness (AQ-12) was administered before the intervention (T1), one week following the...

Université de Fribourg

Phytotoxic metabolites from Neofusicoccum parvum, a pathogen of Botryosphaeria dieback of grapevine

Abou-Mansour, Eliane ; Débieux, Jean-Luc ; Ramírez-Suero, Montserrat ; Bénard-Gellon, Mélanie ; Magnin-Robert, Maryline ; Spagnolo, Alessandro ; Chong, Julie ; Farine, Sibylle ; Bertsch, Christohpe ; L’Haridon, Floriane ; Serrano, Mario ; Fontaine, Florence ; Rego, Cecilia ; Larignon, Philippe

In: Phytochemistry, 2015, vol. 115, p. 207–215

Liquid chromatography-diode array screening of the organic extract of the cultures of 13 isolates of the fungus Neofusicoccum parvum, the main causal agent of botryosphaeria dieback of grapevine, showed similar metabolites. One strain was selected for further chemical studies and led to the isolation and characterisation of 13 metabolites. Structures were elucidated through spectroscopic...

Université de Fribourg

Restoration of circadian rhythmicity in circadian clock-deficient mice in constant light

Abraham, Diya ; Dallmann, Robert ; Steinlechner, Stephan ; Albrecht, Urs ; Eichele, Gregor ; Oster, Henrik

In: Journal of Biological Rhythms, 2006, vol. 21(3), p. 169-176

In mammals, circadian rhythms in behavior and physiology are controlled by a central pacemaker, the SCN, and subordinated clocks throughout the body. On the molecular level, these clocks are based on transcriptional/translational feedback loops involving a set of clock genes that regulate their own transcription. Among the components driving the mammalian circadian clock are the Period 1...

Université de Fribourg

Synthesis and applications of nanocontainers and nanorattles

Abram, Sarah-Luise ; Yep, Philippe ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 12–16

Nanorattles and hollow nanocontainers have unique properties related to the presence of a void space inside the shell, which has been shown to improve the properties of materials for e.g. catalysis, drug release, sensor materials or lithium ion batteries. This article summarizes our recent progress in the synthesis of hollow silica, titania and ceria nanorattles and nanocontainers, eventually...

Université de Fribourg

Ag Nanoencapsulation for Antimicrobial Applications

Abram, Sarah-Luise ; Gagnon, Jacinthe ; Priebe, Magdalena ; Hérault, Nelly ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2018, vol. 72, no. 4, p. 249–252

Biomaterial-related infections remain a significant challenge in medicine. Antimicrobial materials on the basis of Ag nanoparticles represent a promising solution for this issue. Therefore several Ag-containing nanocontainers and nanorattles have been synthesized and characterized that exhibit remarkable control over the release of Ag+ as antimicrobial active species. Their biological...

Université de Fribourg

Brain networks modulated by subthalamic nucleus deep brain stimulation

Accolla, Ettore A. ; Ruiz, Maria Herrojo ; Horn, Andreas ; Schneider, Gerd-Helge ; Schmitz-Hübsch, Tanja ; Draganski, Bogdan ; Kühn, Andrea A.

In: Brain, 2016, vol. 139, no. 9, p. 2503–2515

Deep brain stimulation of the subthalamic nucleus is an established treatment for the motor symptoms of Parkinson’s disease. Given the frequent occurrence of stimulation- induced affective and cognitive adverse effects, a better understanding about the role of the subthalamic nucleus in non-motor functions is needed. The main goal of this study is to characterize anatomical circuits...