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Université de Fribourg

Unequivocal signatures of the crossover to Anderson localization in realistic models of disordered quasi-one-dimensional materials

Lopez-Bezanilla, Alejandro ; Froufe-Pérez, Luis S. ; Roche, Stephan ; Sáenz, Juan José

In: Physical Review B, 2018, vol. 98, no. 23, p. 235423

The only unequivocal known criterion for single-parameter scaling Anderson localization relies on the knowledge of the full conductance statistics. To date, theoretical studies have been restricted to model systems with symmetric scatterers, hence lacking universality. We present an in-depth statistical study of conductance distributions P(g), in disordered ‘micrometer-long’ carbon...

Université de Fribourg

Numerical study of Anderson localization of terahertz waves in disordered waveguides

Lapointe, Clayton P. ; Zakharov, Pavel ; Enderli, F. ; Feurer, T. ; Skipetrov, S. E. ; Scheffold, Frank

In: EPL (Europhysics Letters), 2014, vol. 105, no. 3, p. 34002

We present a numerical study of electromagnetic wave transport in disordered quasi–one-dimensional waveguides at terahertz frequencies. Finite element method calculations of terahertz wave propagation within LiNbO3 waveguides with randomly arranged air-filled circular scatterers exhibit an onset of Anderson localization at experimentally accessible length scales. Results for the average...

Université de Fribourg

The hooked element in the pes of turtles (Testudines): a global approach to exploring primary and secondary homology

Joyce, Walter G. ; Werneburg, Ingmar ; Lyson, Tyler R.

In: Journal of Anatomy, 2013, vol. 223, no. 5, p. 421–441

The hooked element in the pes of turtles was historically identified by most palaeontologists and embryologists as a modified fifth metatarsal, and often used as evidence to unite turtles with other reptiles with a hooked element. Some recent embryological studies, however, revealed that this element might represent an enlarged fifth distal tarsal. We herein provide extensive new myological and...

Université de Fribourg

The power of AAA-ATPases on the road of pre-60S ribosome maturation — Molecular machines that strip pre-ribosomal particles

Kressler, Dieter ; Hurt, Ed ; Bergler, Helmut ; Baßler, Jochen

In: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research, 2011, p. -

The biogenesis of ribosomes is a fundamental cellular process, which provides the molecular machines that synthesize all cellular proteins. The assembly of eukaryotic ribosomes is a highly complex multi-step process that requires more than 200 ribosome biogenesis factors, which mediate a broad spectrum of maturation reactions. The participation of many energy-consuming enzymes (e.g. AAA-type...

Université de Fribourg

Postnatal development of the hippocampal formation: A stereological study in macaque monkeys

Jabès, Adeline ; Banta Lavenex, Pamela A. ; Amaral, David G. ; Lavenex, Pierre

In: The Journal of Comparative Neurology, 2011, p. -

We performed a stereological analysis of neuron number, neuronal soma size, and volume of individual regions and layers of the macaque monkey hippocampal formation during early postnatal development. We found a protracted period of neuron addition in the dentate gyrus throughout the first postnatal year and a concomitant late maturation of the granule cell population and individual dentate...

Bibliothèque cantonale jurassienne

The skeletal taphonomy of archaeopteryx : a quantitative approach

Kemp, Richard A. ; Unwin, David M.

In: Lethaia : an international journal of palaeontology and stratigraphy, 1997, vol. 30, p. 229

Bibliothèque cantonale jurassienne

Incremental growth in vertebrate skeletal tissues : paleobiological and paleoenvironmental implications : introduction

MacFadden, Bruce J.

In: Palaeogeography, palaeoclimatology, palaeoecology : an international journal for the geo-sciences, 2004, vol. 206, p. 177