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...

We calculate e+e− → t̃1t̃1Z at a linear collider. For large splitting between the two stops the cross-section is sensitive to the value of mt̃2 when this particle is too heavy to be directly produced. The results are compared to e+e− → t̃1t̃1h LAPTH-740/99 KEK-CP-086/99 AP-SU-99/02 June 1999

A subclass of dynamical semigroups induced by the interaction of a quantum system with an environment is introduced. Such semigroups lead to the selection of a stable subalgebra of effective observables. The structure of this subalgebra is completely determined. ∗Supported by the KBN research grant No 2 P03B 086 16

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...

V. Radha* and V. Mohan Department of Molecular Genetics, Madras Diabetes Research Foundation, #20, Golden Jubilee Biotech Park for Women Society, SIPCOT, Siruseri, Chennai 603 103, India Dr Mohan’s Diabetes Specialities Centre, World Health Organization Collaborating Centre for Non-Communicable Diseases Prevention and Control and ICMR-Centre for Advanced Research on Diabetes, Chennai 600 086, I...

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...