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Search Results: 1 - 10 of 325257 matches for " S. Kucharski "
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Parovicenko spaces with structures
Wies?aw Kubi?,Andrzej Kucharski,S?awomir Turek
Mathematics , 2013, DOI: 10.1007/s13398-013-0156-0
Abstract: We study an analogue of the Parovicenko property in categories of compact spaces with additional structures. In particular, we present an internal characterization of this property in the class of compact median spaces.
On Open-Open Games of Uncountable Length
Andrzej Kucharski
International Journal of Mathematics and Mathematical Sciences , 2012, DOI: 10.1155/2012/208693
Abstract: The aim of this paper is to investigate the open-open game of uncountable length. We introduce a cardinal number (), which says how long the Player I has to play to ensure a victory. It is proved that ()≤()≤()
Universally Kuratowski-Ulam space and open-open games
Andrzej Kucharski
Mathematics , 2012,
Abstract: We examine the class of spaces in which the second player has winning strategy in the open-open game. We shown that this space is not an universally Kuratowski-Ulam. We also show that the games G and G7 introduced by Daniels, Kunen, Zhou "On the open-open game", Fund. Math. 145 are not equivalent.
Multistate polarization addressing using one single beam in an azo polymer film
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005, DOI: 10.1364/OL.31.001923
Abstract: Peculiar light-matter interactions can break the rule that a single beam polarization can address only two states in an optical memory device. Multistate storage of a single beam polarization is achieved using self-induced surface diffraction gratings in a photo-active polymer material. The grating orientation follows the incident light beam polarization direction. The permanent self-induced surface relief grating can be readout in real time using the same laser beam.
Nonlocal communication with photoinduced structures at the surface of a polymer film
R. Barille,S. Dabos-Seignon,J. -M. Nunzi,S. Ahmadi Kandjani,E. Ortyl,S. Kucharski
Physics , 2006, DOI: 10.1364/OPEX.13.010697
Abstract: Nonlocal communication between two laser light beams is experimented in a photochromic polymer thin films. Information exchange between the beams is mediated by the self-induction of a surface relief pattern. The exchanged information is related to the pitch and orientation of the grating. Both are determined by the incident beam. The process can be applied to experiment on a new kind of logic gates.
Incoherent light induced self-organization of molecules
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005,
Abstract: Although coherent light is usually required for the self-organization of regular spatial patterns from optical beams, we show that peculiar light matter interaction can break this evidence. In the traditional method to record laser-induced periodic surface structures, a light intensity distribution is produced at the surface of a polymer film by an interference between two coherent optical beams. We report on the self-organization followed by propagation of a surface relief pattern. It is induced in a polymer film by using a low-power and small-size coherent beam assisted by a high-power and large-size incoherent and unpolarized beam. We demonstrate that we can obtain large size and well organized patterns starting from a dissipative interaction. Our experiments open new directions to improve optical processing systems.
Spontaneous formation of optically induced surface relief gratings
H. Leblond,R. Barille,S. Ahamadi-kandjani,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2009, DOI: 10.1088/0953-4075/42/20/205401
Abstract: A model based on Fick's law of diffusion as a phenomenological description of the molecular motion, and on the coupled mode theory, is developped to describe single-beam surface relief grating formation in azopolymers thin films. It allows to explain the mechanism of spontaneous patterning, and self-organization. It allows also to compute the surface relief profile and its evolution in time with good agreement with experiments.
Evaluation of differential gene expression during behavioral development in the honeybee using microarrays and northern blots
Robert Kucharski, Ryszard Maleszka
Genome Biology , 2002, DOI: 10.1186/gb-2002-3-2-research0007
Abstract: Spotted microarrays containing several thousand cDNAs were interrogated with RNAs extracted from newly emerged worker bees, experienced foragers and caffeine-treated bees. Thirty-six differentially expressed cDNAs were verified by northern blot hybridization and characterized in silico by sequencing and database searches. Experienced foragers overexpressed royal jelly proteins, a putative imaginal disc growth factor, a transcriptional regulator (Stck) and several enzymes, including α-glucosidases, aminopeptidases and glucose dehydrogenase. Naive workers showed increased expression of members of the SPARC and lectin families, heat-shock cognate proteins and several proteins related to RNA translation and mitochondrial function. A number of novel genes overexpressed in both naive and experienced bees, and genes induced by caffeine, have also been identified.We have shown the usefulness of this transcriptome-based approach for gene discovery, in particular in the context of the efficacy of drug treatment, in a model organism in which routine genetic techniques cannot be applied easily.Recent progress in genome sequencing has significantly widened a division within the major model organisms, some of which are genetically tractable whereas some of which are not but are valuable in other spheres of biology. In particular, the availability of the complete genome sequence in several species has allowed researchers to monitor gene transcription on a global scale for the first time, making possible an impressive leap from the study of individual genes or proteins to an integrated understanding of how gene networks enable complex functions to be carried out [1]. The promise of such methods for systems biologists, behavioralists and neuroethologists is enormous, as they help to integrate the different biological levels from genotype to phenotype.The honeybee (Apis mellifera) has an exceptional track record as a behavioral model. It has contributed greatly to our understanding o
Wideband Characteristic Basis Functions in Radiation Problems
A. A. Kucharski
Radioengineering , 2012,
Abstract: In this paper, the use of characteristic basis function (CBF) method, augmented by the application of asymptotic waveform evaluation (AWE) technique is analyzed in the context of the application to radiation problems. Both conventional and wideband CBFs are applied to the analysis of wire and planar antennas.
Transcriptional profiling reveals multifunctional roles for transferrin in the honeybee, Apis mellifera
R. Kucharski,R. Maleszka
Journal of Insect Science , 2003,
Abstract: Transferrins belong to a family of iron-binding proteins that have been implicated in innate immunity and in vitellogenesis in insects. Here we have sequenced and characterized a full-length cDNA encoding a putative iron-binding transferrin (AmTRF) in the honeybee. AmTRF shows high level of sequence identity with transferrins in both vertebrates and insects (26-46%) suggesting that the primary function of the predicted 712 amino acid protein is binding and transporting of iron. AmTRF is expressed ubiquitously, but particularly high levels of its mRNA are found in the central brain and in the compound eye. Using northern blotting and a microarray based approach we have examined the levels of AmTRF mRNA by expression profiling under a wide range of conditions including developmental stages, septic injury and juvenile hormone treatment. Increased expression of AmTRF is seen during early pupal stages, in the brain of mature foragers and in the abdomen of virgin queens, whereas treatment with juvenile hormone leads to a decrease of AmTRF levels in the abdomen. We show that a transcriptional response of transferrin to septic injury with E. coli is relatively moderate as compared to a dramatic up-regulation of an antibacterial polypeptide, Hymenoptaecin, under similar conditions. We conclude that major fluctuations of AmTRF mRNA in time and space are consistent with context-dependent functional significance and suggest broader multifunctional roles for transferrin in insects.
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