Specify variable or constant species amount
ConstantAmount property indicates whether
the quantity of the species object can vary during the simulation.
the quantity of the species cannot vary during the simulation. By
the quantity of the species can vary during the simulation. If
the quantity of the species can be determined by reactions and rules.
ConstantAmount is for species
objects; the property
ConstantValue is for parameter
When you want the species to participate in a reaction, but
do not want any reactions to modify its quantity, set its
The following is an example of modeling species as constant amounts:
Modeling the role of nucleotides (GTP, ATP, cAMP) and cofactors (Ca++, NAD+, coenzyme A). Consider the role of GTP in the activation of Ras by receptor tyrosine kinases.
Ras-GDP + GTP -> Ras-GTP + GDP
true. In addition, you can set the
BoundaryConditionof these species to
true, thus making them boundary species.
|Applies to||Object: species|
Create a model object named
modelObj = sbiomodel ('my_model');
Add a species object and verify that the
speciesObj = addspecies (modelObj, 'glucose'); get (speciesObj, 'ConstantAmount')
ans = 0
Set the constant amount to
set (speciesObj, 'ConstantAmount', true); get (speciesObj, 'ConstantAmount')
ans = 1