Publications

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47 Publications visible to you, out of a total of 55

Abstract (Expand)

The proteins cdc2 and cyclin form a heterodimer (maturation promoting factor) that controls the major events of the cell cycle. A mathematical model for the interactions of cdc2 and cyclin is constructed. Simulation and analysis of the model show that the control system can operate in three modes: as a steady state with high maturation promoting factor activity, as a spontaneous oscillator, or as an excitable switch. We associate the steady state with metaphase arrest in unfertilized eggs, the spontaneous oscillations with rapid division cycles in early embryos, and the excitable switch with growth-controlled division cycles typical of nonembryonic cells.

Author: J. J. Tyson

Date Published: 15th Aug 1991

Publication Type: Not specified

Abstract

Not specified

Author: M. H. Rubinstein

Date Published: 1st Dec 1976

Publication Type: Journal

Abstract

Not specified

Author: M. H. Rubinstein

Date Published: 1st Dec 1976

Publication Type: Journal

Abstract (Expand)

The effect of Walker tumor on sulphacetamide distribution was studied in rats 21 days after tumor implantation in a hind leg. After oral administration of sulphacetamide (5 and 20 min), the concentration of the drug was found to be lower in the plasma and liver of tumor-bearing rats when compared with that of control group. However, 90 min after sulphacetamide administration, the concentration of the drug in these same tissues was found to be higher in tumor-bearing rats than in control animals. Whereas the tumor had no apparent effect on sulphacetamide concentration in the brain, drug concentrations in the fat tissue of tumor-bearing rats were constantly higher than those of control animals. These changes in sulphacentamide disposition kinetics could be explained in part by delay in gastrointestinal absorption of the drug. Contrary to what was observed after oral administration, constantly higher drug concentrations were found in the plasma of tumor-bearing rats after iv injection of sulphacetamide. Furthermore, the half-life of sulphacetamide in these same animals was much higher than in control animals. It is concluded that, in Walker tumor-bearing rats, there are changes in the kinetics of sulphacetamide which are functions of the route of administration of the drug.

Authors: D. Nadeau, C. Marchand

Date Published: 1st Nov 1975

Publication Type: Journal

Abstract

Not specified

Authors: A. Schmoldt, H. F. Benthe, G. Haberland

Date Published: 1st Sep 1975

Publication Type: Journal

Abstract

Not specified

Authors: A. Schmoldt, H. F. Benthe, G. Haberland

Date Published: 1st Sep 1975

Publication Type: Journal

Abstract (Expand)

We used parameter scanning to emulate changes to the limiting rate for steps in a fitted model of glucose-derepressed yeast glycolysis. Three flux-control regimes were observed, two of which were under the dominant control of hexose transport, in accordance with various experimental studies and other model predictions. A third control regime in which phosphofructokinase exerted dominant glycolytic flux control was also found, but it appeared to be physiologically unreachable by this model, and all realistically obtainable flux control regimes featured hexose transport as a step involving high flux control.

Authors: L. Pritchard, D. B. Kell

Date Published: No date defined

Publication Type: Not specified

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