نتایج جستجو برای: polar function

تعداد نتایج: 1253507  

Journal: :The Journal of Cell Biology 1976
A P Mahowald K Illmensee F R Turner

Posterior polar plasm of the Drosophila egg has been shown to function autonomously in germ cell determination after transplantation to either the anterior or mid-ventral region of the early embryo. By means of similar transplantations, we have tested the ability of polar plasm of Drosophila immigrans to induce the formation of pole cells in a Drosophila melanogaster embryo. After the transplan...

Journal: :Appl. Soft Comput. 2011
Wiehann Matthysen Andries Petrus Engelbrecht

The Particle Swarm Optimisation (PSO) algorithm consists of a population (or swarm) of particles that are “flown” through an n-dimensional space in search of a global best solution to an optimisation problem. PSO operates in Cartesian space, producing Cartesian solution vectors. By making use of an appropriate mapping function the algorithm can be modified to search in polar space. This mapping...

Journal: :The journals of gerontology. Series B, Psychological sciences and social sciences 2011
Hélène Payette N'Deye Rokhaya Gueye Pierrette Gaudreau José A Morais Bryna Shatenstein Katherine Gray-Donald

BACKGROUND Decline of physical function with age is associated with substantial health consequences. Physical and psychological functioning is linked, but the temporal nature of this association remains unclear. METHODS Three-year follow-up data from men and women (n = 1,741), aged 68-82 years, in the longitudinal study on nutrition and successful aging (NuAge; Québec, Canada) were used. Grow...

Journal: :Clinical physiology and functional imaging 2005
Peter A Cain Martin Ugander John Palmer Marcus Carlsson Einar Heiberg Håkan Arheden

BACKGROUND The clinical management of patients with coronary artery disease (CAD) often involves a complex assessment of the extent and severity of changes in left ventricular (LV) myocardial perfusion, function and viability. We aimed to explore the feasibility of integrative quantitative representation of LV perfusion, function and viability in adjacent polar plots. In order to assess the cli...

Abstract In this work, the Mellin transform method was used to obtain solutions for the stress field components in two dimensional (2D) elasticity problems in terms of plane polar coordinates. the Mellin transformation was applied to the biharmonic stress compatibility equation expressed in terms of the Airy stress potential function, and the boundary value problem transformed to an algebraic  ...

Journal: :physical chemistry research 0
seyed ahmad razavizadeh payam e noor university

in the present work, a modified correlation is presented for the second virial coefficients of both polar and nonpolar fluids based on the corresponding states principle. the second virial coefficients of gaseous polar and non-polar compounds were calculated and compared with experimental data and with other correlations. comparisons with the existing correlations show that the present work is ...

Journal: :Chinese Journal of Chemistry 2022

Comprehensive Summary As an extended model of conventional molecular rotors, a conceived construction novel crystalline rotor that simultaneously contains two discrete polar rotators is presented here. The supramolecular self‐assembly 18‐crown‐6 host and rotator‐containing ion‐pair guests affords three‐in‐one cocrystal, (2‐NH 3 ‐ i BuOH)(18‐crown‐6)[ZnBr (H 2 O)], in which the hydroxyl group aq...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Alice S Breda Ora Hazak Christian S Hardtke

Polar cellular localization of proteins is often associated with their function and activity. In plants, relatively few polar-localized factors have been described. Among them, the plasma membrane-associated Arabidopsis proteins OCTOPUS (OPS) and BREVIS RADIX (BRX) display shootward and rootward polar localization, respectively, in developing root protophloem cells. Both ops and brx null mutant...

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