ZIB

Digitale Medien

Biochemical and histochemical investigation of diurnal variation in cAMP concentration and adenylate cyclase activity in white dutch clover (1979)

Tu, J. C.

Springer

Protoplasma 99 (1979), S. 139-146

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ISSN: 1615-6102

Schlagwort(e): Adenylate cyclase ; Cyclic AMP ; Diurnal variation ; Histochemistry ; Clover yellow mosaic virus ; White clover

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Diurnal changes in the concentration of cAMP in white clover were investigated biochemically and histochemically. Biochemical assays showed that a) the concentration of cAMP in healthy leaves was consistently higher than in CYMV-diseased leaves under the same light condition and b) the concentration of cAMP in clover leaves exhibited a diurnal cycle. The diurnal changes in cAMP concentration were present in both healthy and CYMV-diseased clover leaves. Histochemical localization tests indicated that the adenylate cyclase activity could be semi quantilated as more dense reaction products were present in the membrane systems of healthy than CYMV-diseased leaves. The histochemical results were consistent with the biochemical data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01274075

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Digitale Medien

Comparison of near-isogenic lines for anthracnoseAre are genes in common bean,Phaseolus vulgaris L. (1987)

Park, S. J. ; Tu, J. C.

Springer

Euphytica 36 (1987), S. 251-256

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ISSN: 1573-5060

Schlagwort(e): Phaseolus vulgaris ; bean, near-isogenic line ; Colletotrichum lindemuthianum ; bean anthracnose ; Are gene

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Summary This study was undertaken to determine whether the Are gene controlling anthracnose resistance had an adverse effect on maturity and yield because backcross-derived cultivars/lines had numerically lower yield and later maturity than the respective recurrent parent. Three pairs of common bean lines near-isogenic for theAre gene were developed fromAre are F2 plants of the sixth backcross of Seafarer, Fleetwood, and Ex Rico 23. The near-isogenic lines were tested along with the recurrent cultivars and backcross-derived cultivars/lines. The results showed no evidence of any adverse effect of theAre gene on the agronomic characteristics in 11 trails at 5 locations in 3 years.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00730671

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Digitale Medien

NUMERICAL MODELLING OF THREE-DIMENSIONAL FLY-ASH FLOW IN POWER UTILITY BOILERS (1997)

Tu, J. Y. ; Fletcher, C. A. J. ; Behnia, M.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 24 (1997), S. 787-806

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ISSN: 0271-2091

Schlagwort(e): three-dimensional ; two-phase flow ; Eulerian modelling ; RNG k-∊ turbulence model ; particle-wall collision ; power utility boilers ; Engineering ; Numerical Methods and Modeling

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Notizen: A two-fluid Eulerian model in combination with a particle-wall collision model and generalized Eulerian boundary conditions for the particulate phase is employed to predict complex three- dimensional fly-ash flows which often cause severe erosion to boiler tubes located in power utility boilers. Mean momentum and mass conservation equations are solved for each phase using a finite volume scheme with two-way coupling and a modified renormalization group (RNG)-based k -∊ turbulence model. Comparison of predicted particle concentration with measured data is made and excellent agreement is obtained. The detailed character of the particulate velocity field and concentration just downstream of the 180° bend shows a marked dependence on the Stokes number not previously reported. © 1997 by John Wiley & Sons, Ltd.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

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Digitale Medien

Calculation of flows using three-dimensional overlapping grids and multigrid methods (1995)

Tu, J. Y. ; Fuchs, L.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 38 (1995), S. 259-282

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ISSN: 0029-5981

Schlagwort(e): Complex geometries ; Numerical accuracy and efficiency ; 3D overlapping grids ; Multigrid methods ; Finite-volume ; Engine flows ; Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: A computational methodology combining overlapping grid techniques with multigrid methods has been developed for three-dimensional flow calculations in or around complex geometries. The computational accuracy, efficiency and capability of the present approach are investigated in this paper. The incompressible Navier-Stokes equations are discretized using a finite volume method on a semi-staggered grid. The discrete problem is solved by a multigrid algorithm. Some numerical examples are chosen for evaluating numerical accuracy: (a) a straight pipe for which the exact solution is known; (b) curved pipes where previous experimental and numerical data are available; (c) an axisymmetric sudden expansion. The performance of the multigrid method on overlapping grids is assessed. Several cases of flows in stationary and time-dependent complex geometries are given to demonstrate the capability and the potential of the methods that we employ.

Zusätzliches Material: 20 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/nme.1620380207

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Digitale Medien

Overlapping grids and multigrid methods for three-dimensional unsteady flow calculations in IC engines (1992)

Tu, J. Y. ; Fuchs, L.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 15 (1992), S. 693-714

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ISSN: 0271-2091

Schlagwort(e): Overlapping grids ; Multigrid method ; Navier-Stokes equations ; Finite volume method ; Moving boundaries ; Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Notizen: A new computational methodology with emphasis on using an overlapping grid technique and a multigrid method has been developed. The main feature of the present overlapping-grid system is of extended flexibility to deal with three-dimensional complex multicomponent geometries. The multigrid method is incorporated into this technique to accelerate the convergence of the numerical solution. The current scheme has been applied for computations of the laminar flows in the multicomponent configuration of internal combusion engines. The flow is governed by three-dimensional, time-dependent, incompressible Navier-Stokes equations with the continuity equation. A time-independent grid system is constructed for the moving boundary, i.e. the moving piston in the engine. This grid system is entirely different from others for the same problem in previous works. The performance of the present method has been validated by comparing the results with those from an equivalent, single-grid method and those from experiments. In addition, the flexibility and potential of the method has been demonstrated by calculating several cases which would be very difficult to be handled by other schemes.

Zusätzliches Material: 15 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/fld.1650150605

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