Determination of the decay rate constant for hepatocytes immobilized in alginate microcapsules

2010 ◽  
Vol 27 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Aldo Leal-Egaña ◽  
Aránzazu Díaz-Cuenca ◽  
Augustinus Bader
Keyword(s):  
Decay Rate ◽  
Rate Constant ◽  
Decay Rate Constant

Determination of the decay rate constant for hepatocytes immobilized in alginate microcapsules

2009 ◽  
pp. 090624003112037
Author(s):  
Aldo Leal-Egaña ◽  
Aránzazu Díaz-Cuenca ◽  
Augustinus Bader
Keyword(s):  
Decay Rate ◽  
Rate Constant ◽  
Decay Rate Constant

scholarly journals Stimulated Raman–UV Optical Double Resonance Spectroscopy of Van Der Waals Complexes of Benzene

1994 ◽  
Vol 14 (1-3) ◽  
pp. 85-102 ◽  
Author(s):  
Takayuki Ebata ◽  
Seiichi Ishikawa ◽  
Mitsuo Ito ◽  
Shi-Aki Hyodo
Keyword(s):  
Decay Rate ◽  
Rate Constant ◽  
Vibrational Frequency ◽  
Double Resonance ◽  
Van Der Waals Complexes ◽  
Resonance Spectroscopy ◽  
Decay Rate Constant ◽  
Optical Double Resonance ◽  
Benzene Dimer ◽  
Double Resonance Spectroscopy

Spectroscopic and dynamical studies of the van der Waals complexes of benzene–Ar, benzene–N2 and benzene dimer in the electronically ground state (S0) have been performed by the use of stimulated Raman–UV optical double resonance spectroscopy. The vibrational frequency of mode 1 of the complexes and the decay rate constants of the 11 levels (∼993 cm-1) have been measured. The vibrational frequency shifts of mode 1 in S0 upon complex formation were less than 1 cm-1for all the complexes. On the other hand, the decay rate constant due to intramolecular vibrational redistribution and/or vibrational predissociation showed a drastic change. The decay rate constant of the 11 level of the benzene dimer was 2.4 × 107 s-1, while those of the benzene–Ar and benzene–N2 complexes were much smaller than 1 × 106 s-1. It was also found that the decay rate constant in S0 is much smaller than that in S1. For the benzene dimer, the depolarization ratio of Raman band of mode 1 was recalculated by taking into account of the anisotropy of the polarizability of benzene molecule. The comparison between the observed and calculated polarization ratio shows that the benzene dimer has the “T-shaped” structure which was proposed by the group of Felker.

scholarly journals Temperature dependence of anaphase chromosome velocity and microtubule depolymerization.

1975 ◽  
Vol 67 (3) ◽  
pp. 789-800 ◽  
Author(s):  
J W Fuseler
Keyword(s):  
Decay Rate ◽  
Rate Constant ◽  
Time Course ◽  
Common Mechanism ◽  
Chromosome Movement ◽  
Microtubule Depolymerization ◽  
Animal Cells ◽  
Spindle Fiber ◽  
Decay Rate Constant ◽  
Asterias Forbesi

The time course of chromosome movement and decay of half-spindle birefringence retardation in anaphase have been precisely determined in the endosperm cell of a plant Tilia americana and in the egg of an animal Asterias forbesi. For each species, the anaphase retardation decay rate constant and chromosome velocity are similar exponential functions of temperature. Over the temperature range at which these cells can complete anaphase, chromosome velocity and retardation rate constant yield a positive linear relationship when plotted against each other. At the higher temperatures where the chromosomes move faster, the spindle retardation decays faster, even though the absolute spindle retardation is greater. Chromosome velocity thus parallels the anaphase spindle retardation decay rate, or rate of spindle microtubule depolymerization, rather than absolute spindle retardation, or the amount of microtubules in the spindle. These observations suggest that a common mechanism exists for mitosis in plant and animal cells. The rate of anaphase chromosome movement is associated with an apparent first-order process of spindle fiber disassembly. This process irreversibly prevents spindle fiber subunits from participating in the polymerization equilibrium and removes microtubular subunits from chromosomal spindle fibers.

Coarse woody debris decomposition documented over 65 years on southern Vancouver Island

1998 ◽  
Vol 28 (5) ◽  
pp. 788-793 ◽  
Author(s):  
Jeff N Stone ◽  
Andy MacKinnon ◽  
John V Parminter ◽  
Ken P Lertzman
Keyword(s):  
Decay Rate ◽  
Pacific Northwest ◽  
Rate Constant ◽  
Coarse Woody Debris ◽  
Woody Debris ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Permanent Plots ◽  
Decay Rate Constant ◽  
Exponential Decay Rate

In 1929-1930, Stig Schenström and J.D. Curtis established an experiment to study thinning dynamics of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on southern Vancouver Island, British Columbia. As a subcomponent of the experiment, the coarse woody debris (CWD) from the previous stand were mapped and the decay condition classified on five permanent plots. These scaled drawings and classifications were updated in 1945-1947 and 1995-1996. This unique 65-year period of CWD observation confirms that observations of CWD volume loss on Vancouver Island are similar to elsewhere in the Pacific Northwest. The simple exponential decay rate constant was 0.022 ·year-1 based on volume of primarily Douglas-fir on the five plots. The decay rate constant by large-end diameter was 0.067 ·year-1 for logs <= 20 cm, 0.056 ·year-1 for 21-40 cm, 0.021 ·year-1 for 41-80 cm, and 0.012 ·year-1 for logs > 80 cm.

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