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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

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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