Results 251 to 260 of about 87,879 (288)

Planar polarity, tissue polarity and planar morphogenesis in plants

Current Opinion in Plant Biology, 2012
Plant tissues commonly undergo morphogenesis within a single tissue layer or between associated cells of the same tissue type such as vascular cells. Tissue morphogenesis may rely on an underlying tissue polarity marked by coordinated unidirectional asymmetric localisation of molecules to ends of cells.
Moritaka Nakamura, Christian S Kiefer, Markus Grebe   +2 more
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Planar silicon-based light polarizers

Optics Letters, 2004
Silicon-based thin-film polarizers operating in the visible and near-infraed spectral range are fabricated by electrochemical etching of bulk silicon wafers. Anisotropically etched (110) porous silicon layers exhibit a strong in-plane anisotropy of the refractive index.
J, Diener, N, Künzner, E, Gross, D, Kovalev, M, Fujii   +4 more
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Planar cell polarity and cilia

Seminars in Cell & Developmental Biology, 2009
In the last few years, evidence has come to light suggesting that planar cell polarity signaling in vertebrates may be controlled and modulated by primary cilia, subcellular organelles that emerge from the plasma membrane of most cell types. This characteristic distinguishes vertebrate planar cell polarity signaling from that in insects. We review here
Evelyne, Fischer, Marco, Pontoglio
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Planar polarity of ependymal cilia

Differentiation, 2012
Ependymal cells, epithelial cells that line the cerebral ventricles of the adult brain in various animals, extend multiple motile cilia from their apical surface into the ventricles. These cilia move rapidly, beating in a direction determined by the ependymal planar cell polarity (PCP).
Norihito, Kishimoto, Kazunobu, Sawamoto
openaire   +2 more sources

Insight into planar cell polarity

Experimental Cell Research, 2014
Planar cell polarity or PCP refers to a uniform cellular organization within the plan, typically orthogonal to the apico-basal polarity axis. As such, PCP provides directional cues that control and coordinate the integration of cells in tissues to build a living organism. Although dysfunctions of this fundamental cellular process have been convincingly
Michael, Sebbagh, Jean-Paul, Borg
openaire   +2 more sources

Planar photonic crystal polarization splitter

Optics Letters, 2004
The differential dispersion relation for the E and H modes (TM-like and TE-like, respectively) in planar photonic crystals is used to control the polarization-dependent propagation of light. E- and H-polarized beams were separated by 10 degrees after propagating through a 20-microm-long planar photonic crystal in the wavelength range from 1250 to 1300 ...
Wu, LJ, Mazilu, M., Gallet, JF, Krauss, TF, Jugessur, A., De La Rue, RM   +5 more
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Polarization-Dependent Amplification in Planar Waveguides

Conference on Lasers and Electro-Optics Europe, 1996
We model a planar waveguide with an anisotropic active layer (i.e. with permittivity ϵ. a tensor) by using a scattering approach. The anisotropy of the permittivity can e.g. arise through the presence of strained quantum wells. It is calculated how much anisotropy is needed to get. a gain that is polarisation-independent.
Visser, T.D., Lenstra, D., Blok, H.P.
openaire   +1 more source

Planar cell polarity and vertebrate organogenesis

Seminars in Cell & Developmental Biology, 2006
In addition to being polarized along their apical/basal axis, cells composing most (if not all) organs are also polarized in a plane vertical to the A/B axis. Recent studies indicate that this so-called planar cell polarity (PCP) plays an essential role in the formation of multiple organ systems regulating directed cell migrations, polarized cell ...
Courtney, Karner, Keith A, Wharton, Thomas J, Carroll   +2 more
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Arbitrarily polarized planar antennas

IRE International Convention Record, 2005
This paper describes the analysis and design of a class of antennas which can radiate and receive constant shape pencil beams with either circular sense, any linear, or elliptical polarization by a simple adjustment in the feed circuit. Such radiators are called arbitrarily polarized antennas.
F. Goebels, K. Kelly
openaire   +1 more source

Modeling Planar Cell Polarity

Science, 2005
Epithelial cells of many organisms show planar cell polarity. In the Drosophila wing, hexagonally packed cells accumulate various planar cell polarity signaling components in localized areas (proximally or distally), and an actin-rich hair develops from the distal vertex and points distally.
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