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Université de Fribourg

How do the global stock markets influence one another? Evidence from finance big data and Granger causality directed network

Tang, Yong ; Xiong, Jason Jie ; Luo, Yong ; Zhang, Yi-Cheng

In: International Journal of Electronic Commerce, 2019, vol. 23, no. 1, p. 85–109

The recent financial network analysis approach reveals that the topologies of financial markets have an important influence on market dynamics. However, the majority of existing Finance Big Data networks are built as undirected networks without information on the influence directions among prices. Rather than understanding the correlations, this research applies the Granger causality test to...

Université de Fribourg

Predicting perceptions of the lexical richness of short French, German, and Portuguese texts using text-based indices

Vanhove, Jan ; Bonvin, Audrey ; Lambelet, Amelia ; Berthele, Raphael

In: Journal of Writing Research, 2019, vol. 10, no. 3, p. 499-525

We investigated how well readers’ perceptions of the lexical richness of short texts can be predicted on the basis of automatically computable indices of the texts’ lexical properties. 3,060 French, German and Portuguese texts (between 9 and 284 words long) written by 8- to 10-year-olds were rated for their lexical richness by between 3 and 18 uninstructed raters, and over 150 indices were...

Université de Fribourg

Antimicrobial Resistance in Escherichia coli

Poirel, Laurent ; Madec, Jean-Yves ; Lupo, Agnese ; Schink, Anne-Kathrin ; Kieffer, Nicolas ; Nordmann, Patrice ; Schwarz, Stefan

In: Microbiology Spectrum, 2018, vol. 6, no. 4, p. -

Multidrug resistance in Escherichia coli has become a worrying issue that is increasingly observed in human but also in veterinary medicine worldwide. E. coli is intrinsically susceptible to almost all clinically relevant antimicrobial agents, but this bacterial species has a great capacity to accumulate resistance genes, mostly through horizontal gene transfer. The most problematic...

Université de Fribourg

Aging effects on prefrontal cortex oxygenation in a posture-cognition dual-task: an fNIRS pilot study

Marusic, Uros ; Taube, Wolfgang ; Morrison, Shawnda A. ; Biasutti, Lea ; Grassi, Bruno ; Pauw, Kevin De ; Meeusen, Romain ; Pisot, Rado ; Ruffieux, Jan

In: European Review of Aging and Physical Activity, 2019, vol. 16, no. 1, p. 2

The aging process alters upright posture and locomotion control from an automatically processed to a more cortically controlled one. The present study investigated a postural-cognitive dual-task paradigm in young and older adults using functional Near- Infrared Spectroscopy (fNIRS).Methods: Twenty healthy participants (10 older adults 72 ± 3 y, 10 young adults 23 ± 3 y) performed a...

Université de Fribourg

Cystathionine γ Lyase Sulfhydrates the RNA Binding Protein Human Antigen R to Preserve Endothelial Cell Function and Delay Atherogenesis

Bibli, Sofia-Iris ; Hu, Jiong ; Sigala, Fragiska ; Wittig, Ilka ; Heidler, Juliana ; Zukunft, Sven ; Tsilimigras, Diamantis I. ; Randriamboavonjy, Voahanginirina ; Wittig, Janina ; Kojonazarov, Baktybek ; Schürmann, Christoph ; Siragusa, Mauro ; Siuda, Daniel ; Luck, Bert ; Malik, Randa Abdel ; Filis, Konstantinos A. ; Zografos, George ; Chen, Chen ; Wang, Dao Wen ; Pfeilschifter, Josef ; Brandes, Ralf P. ; Szabo, Csaba ; Papapetropoulos, Andreas ; Fleming, Ingrid

In: Circulation, 2019, vol. 139, no. 1, p. 101–114

Hydrogen sulfide (H2S), generated by cystathionine γ lyase (CSE), is an important endogenous regulator of vascular function. The aim of the present study was to investigate the control and consequences of CSE activity in endothelial cells under physiological and proatherogenic conditions.

Université de Fribourg

Surviving in the BRICS: the struggle of South African business in coping with new partners and investors

Wenzel, Nadine ; Freund, Bill ; Graefe, Olivier

In: International Review of Applied Economics, 2019, vol. 33, no. 1, p. 51–70

The purpose of this paper is to improve our understanding of how South African economic actors react to the gradual entry of non-South African BRICS firms in their established business areas. Throughout the twentieth century, South Africa’s trade and investment activities were conducted overwhelmingly with Western countries. However, the end of apartheid coincided with significant shifts as...

Université de Fribourg

Litter decomposition driven by soil fauna, plant diversity and soil management in urban gardens

Tresch, Simon ; Frey, David ; Le Bayon, Renée-Claire ; Zanettac, Andrea ; Rasche, Frank ; Fliessbach, Andreas ; Moretti, Marco

In: Science of The Total Environment, 2019, vol. 658, p. 1614–1629

In the face of growing urban densification, green spaces in cities, such as gardens, are increasingly important for biodiversity and ecosystem services. However, the influences of urban green space management on biodiversity and ecosystem functioning (BEF) relationships is poorly understood. We investigated the relationship between soil fauna and litter decomposition in 170 urban garden sites...

Accès public à partir du 30 avr. 2019
Université de Fribourg

Spatial transformation abilities and their relation to later mathematics performance

Frick, Andrea

In: Psychological Research, 2018, p. 1-20

Using a longitudinal approach, this study investigated the relational structure of different spatial transformation skills at kindergarten age, and how these spatial skills relate to children’s later mathematics performance. Children were tested at three time points, in kindergarten, first grade, and second grade (N = 119). Exploratory factor analyses revealed two subcomponents of spatial...

Accès public à partir du 30 janv. 2021
Université de Fribourg

Spatial scaling, proportional thinking, and numerical understanding in 5- to 7-year-old children

Möhring, Wenke ; Frick, Andrea ; Newcombe, Nora S.

In: Cognitive Development, 2018, vol. 45, p. 57–67

The present study investigated the role of spatial scaling and proportional-reasoning skills in children’s number-line estimations. Proportional strategies in number-line estimations might suggest that correlations between number-line knowledge and scaling are driven by proportional thinking. However, analyses of data on spatial scaling, proportional reasoning, counting skills, and number-line...

Université de Fribourg

The relation between spatial thinking and proportional reasoning in preschoolers

Möhring, Wenke ; Newcombe, Nora S. ; Frick, Andrea

In: Journal of Experimental Child Psychology, 2015, vol. 132, p. 213–220

Previous research has indicated a close link between spatial and mathematical thinking. However, what shared processes account for this link? In this study, we focused on the spatial skill of map reading and the mathematical skill of proportional reasoning and investigated whether scaling, or the ability to relate information in different-sized representations, is a shared process. Scaling was...