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  • COMPUTER PROGRAMMING AND SOFTWARE  (3)
  • Endomembrane system  (1)
  • 1990-1994  (4)
  • 2015
  • 1993  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Hormonal regulation of Ca2+ transport in the endomembrane system of the barley aleurone (1993)
    Springer
    Planta 189 (1993), S. 507-515 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Aleurone ; Calcium transport ; Endomembrane system ; Gibberellin ; Hordeum (Ca2+transport)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gibberellic acid (GA3) and abscisic acid (ABA) regulate α-amylase production in aleurone tissue of the barley (Hordeum vulgare L.) grain during germination. Since α-amylase is a Ca2+-containing protein that is synthesized on the rough endoplasmic reticulum (ER), we investigated the possibility that GA3 and ABA regulate the flux of Ca2+ into the ER of aleurone cells. Membrane vesicles were isolated from GA3- and ABA-treated aleurone layers to characterize the effect of these hormones on calcium transport (CaT) activity as measured by the uptake of 45CaCl2 in vitro. We found that ABA and GA3 greatly alter the relative amounts of CaT activity in ER and tonoplast (TP) membrane fractions. Treatment with GA3 results in CaT being associated primarily with the ER, whereas treatment with ABA results in roughly equal amounts of CaT in ER and TP. Moreover, we found that ABA prevents or reverses the GA3-induced increase in CaT in the ER. The effects of ABA and GA3 on CaT in the ER require several hours to develop, and the effects of these hormones on CaT cannot be brought about by adding the hormones to membranes in vitro. In order to determine whether the in-vitro measurements of CaT reflect changes that occur in vivo we measured the Ca2+ content of isolated ER, measured Ca2+ transport into aleurone layers, and examined differences in the ability of ER proteins from GA- and ABA-treated layers to bind Ca2+. Our results indicate that GA3 increases and ABA decreases both Ca2+ flux into the ER and the amount of calcium that accumulates in the ER of barley aleurone cells in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198213
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    Paper (German National Licenses)
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  • 2
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    Dynamic mesh adaption for triangular and tetrahedral grids (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The following topics are discussed: requirements for dynamic mesh adaption; linked-list data structure; edge-based data structure; adaptive-grid data structure; three types of element subdivision; mesh refinement; mesh coarsening; additional constraints for coarsening; anisotropic error indicator for edges; unstructured-grid Euler solver; inviscid 3-D wing; and mesh quality for solution-adaptive grids. The discussion is presented in viewgraph form.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Langley Research Center, Unstructured Grid Generation Techniques and Software; p 181-192
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An adaptive mesh-moving and refinement procedure for one-dimensional conservation laws (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We examine the performance of an adaptive mesh-moving and /or local mesh refinement procedure for the finite difference solution of one-dimensional hyperbolic systems of conservation laws. Adaptive motion of a base mesh is designed to isolate spatially distinct phenomena, and recursive local refinement of the time step and cells of the stationary or moving base mesh is performed in regions where a refinement indicator exceeds a prescribed tolerance. These adaptive procedures are incorporated into a computer code that includes a MacCormack finite difference scheme wih Davis' artificial viscosity model and a discretization error estimate based on Richardson's extrapolation. Experiments are conducted on three problems in order to qualify the advantages of adaptive techniques relative to uniform mesh computations and the relative benefits of mesh moving and refinement. Key results indicate that local mesh refinement, with and without mesh moving, can provide reliable solutions at much lower computational cost than possible on uniform meshes; that mesh motion can be used to improve the results of uniform mesh solutions for a modest computational effort; that the cost of managing the tree data structure associated with refinement is small; and that a combination of mesh motion and refinement reliably produces solutions for the least cost per unit accuracy.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Applied Numerical Mathematics (ISSN 0168-9274); p. 259-282
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A new procedure for dynamic adaption of three-dimensional unstructured grids (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new procedure is presented for the simultaneous coarsening and refinement of three-dimensional unstructured tetrahedral meshes. This algorithm allows for localized grid adaption that is used to capture aerodynamic flow features such as vortices and shock waves in helicopter flowfield simulations. The mesh-adaption algorithm is implemented in the C programming language and uses a data structure consisting of a series of dynamically-allocated linked lists. These lists allow the mesh connectivity to be rapidly reconstructed when individual mesh points are added and/or deleted. The algorithm allows the mesh to change in an anisotropic manner in order to efficiently resolve directional flow features. The procedure has been successfully implemented on a single processor of a Cray Y-MP computer. Two sample cases are presented involving three-dimensional transonic flow. Computed results show good agreement with conventional structured-grid solutions for the Euler equations.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 93-0672 , RIACS-TR-93-01 , AD-A268651 , AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States|; 13 p.
    Format: text
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    NASA TECHNICAL REPORTS
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