Biological dispersal shapes species' distribution and affects their coexistence. The spread of organisms governs the dynamics of invasive species, the spread of pathogens, and the shifts in species ranges due to climate or environmental change. Despite its relevance for fundamental ecological processes, however, replicated experimentation on biological dispersal is lacking, and current assessme...

The importance of water-air interfaces (WAI) on microorganism activities has been recognized by many researchers. In this paper, we report a novel phenomenon: the entrapment of ciliates Tetrahymena at the WAI. We first characterized the behavior of cells at the interface and showed that the cells' swimming velocity was considerably reduced at the WAI. To verify the possible causes of the entrap...

F. Dhombres1, 2, J. Charlet1, 3, Section Editors for the IMIA Yearbook Section on Knowledge Representation and Management 1 INSERM, UMR_S 1142, LIMICS, 75006 Paris, France Sorbonne Universités, UPMC Univ. Paris 06, UMR_S 1142, LIMICS, 75006 Paris, France Université Paris 13, Sorbonne Paris Cité, UMR_S 1142, LIMICS, 93430 Villetaneuse, France 2 Department of Fetal Medicine, Armand Trousseau Hosp...

Diatoms are the primary source of nutrition and energy for the Southern Ocean ecosystem. Microalgae, including diatoms, synthesise biological macromolecules such as lipids, proteins and carbohydrates for growth, reproduction and acclimation to prevailing environmental conditions. Here we show that three key species of Southern Ocean diatom (Fragilariopsis cylindrus, Chaetoceros simplex and Pseu...

Upper extremity musculoskeletal symptoms and disorders are common in the working population. The economic and social impact of such disorders is considerable. Long-time, dynamic repetitive exposure of the hand-arm system during manual handling operations (MHO) alone or in combination with static and postural effort are recognised as causes of musculoskeletal symptoms and disorders. The assessme...

Observations of the microtubular 'km' system and filamentous ' M ' systems in living specimens of Stentor coerulens show that on contraction of the body both systems shorten, thicken and remain straight, but that on initial relaxation they behave differently: the km fibres begin to lengthen later than the M fibres, the latter being thrown into sinuous folds. Electron microscopy of specimens coo...

J. Charlet1,2, S.J. Darmoni2,3, Section Editors for the IMIA Yearbook Section on Knowledge Representation and Management 1 AP-HP, Dept. of Clinical Research and Development, Paris, France 2 INSERM, U1142, LIMICS, Paris, France; Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1142, LIMICS, Paris, France; Université Paris 13, Sorbonne Paris Cité, LIMICS, (UMR_S 1142), Villetaneuse, France 3 Depar...

Systematic studies of phenotypic diversity--required for understanding evolution--lag behind investigations of genetic diversity. Here we develop a quantitative approach to studying behavioral diversity, which we apply to swimming of the ciliate Tetrahymena. We measure the full-lifetime behavior of hundreds of individual organisms at high temporal resolution, over several generations and in div...

1Department of Physics and Astronomy, University College London, Gower Street, LondonWC1E 6BT, UK 2Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, 5 place Jules Janssen, Meudon Cedex 92195, France 3Atmospheric, Oceanic and Planetary Physics, Clarendon Laboratory, University of Oxford, Parks Road...