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PC-SIG: World of Education
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PC-SiG's World of Education.iso
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1725
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bsimhelp.msg
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1989-04-11
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Reseed/New: Type 'N' or 'R' to begin a new simulation or continue a
previous run. If you choose the reseed option you must have a file
available containing the saved data from a previous run and you will be
prompted for the path and name of that file. When you continue a
previous run you will have only limited options for changing the
original settings established when that run was inititated.
Stagnant/Circulating: Type 'S' or 'C' to choose between a
non-circulating, 'pond' type simulation and a circulating mode
comparable to a stirred flask. In the stagnant mode, conditions may
differ from top to bottom of the simulation. In the circulating mode,
conditions will be homogenous except for light intensity (light is
absorbed by the 'medium', hence is at its highest intensity at the top
of the simulation).
Open/Closed: Type 'O' or 'C' to choose between having the head space
gases in equilibrium with a selected atmospheric value or having the
simulation 'sealed' from the outside world.
Random/Defined: Type 'R' or 'D'. The Random choice will cause the
simulation to be initiated with organisms of random genetic
composition. The Defined option allows you to enter up to 3 genomes of
your choice or will allow seeding with a collection of known genomes.
Inhibitors: Twelve 'substances', letter names A to L, are available
which act as 'biochemical inhibitors'. These can be added in
combinations of up to six at one time to investigate the various
simulated chemical pathways that may be available within any given
collection of organisms. To enter an inhibitor type the appropriate
letter.
Mutagen: Analagous to a mutagenic factor, such as UV radiation, in
natural environments. Mutagen controls the rate at which 'mutations'
occur in the simulated genome. A value of 0 results in no mutations
and is useful for studying the characteristics of defined populations.
Light intensity: Luminance at the surface of the simulation. The value
assumes that portion of the spectrum which is photosynthetically
active. A value of 0 represents darkness.
Depth: Effective only in the stagnant model, this variable determines
the rate at which solutes diffuse vertically in the simulation.
Horizontal distribution is considered to be homogeneous. Higher values
are equivalent to a deeper pond.
Oxygen: Sets the concentration of oxygen in the aqueous phase in
equilibrium with the gas phase in open systems. Also provides the
initial concentration of oxygen at the start of a new simulation
whether open or closed.
Carbon dioxide: Sets the concentration of carbon dioxide in the
aqueous phase in equilibrium with the gas phase in open systems. Also
provides the initial concentration of carbon dioxide at the start of a
new simulation whether open or closed.
Reservoir size: A technical factor that determines the relative
effect of metabolism of each organism on the substrate pool. It is
analagous to buffering capacity in a natural medium and is loosely
analagous to the volume of a natural system. A low value produces a
simulation in which substrate becomes limiting at low population
densities.
Starting population: The number of 'organisms' with which the
simulation is initially seeded. Not meaningful in reseed and seeding
options.
Soluble substrate concentration: The concentration of soluble organic
matter in the simulation at startup.
Amount sediment: The total mass of sediment at the start of the
simulation. Some sediment may be suspended in the aqueous phase and
some may be trapped at the bottom of the simulation. The sediment
serves as substrate for some biochemical pathways.
Number of genomes: Allows selecting up to 3 predefined genomes when the
defined option was previously chosen. The configuration for each
genome will be entered on a following input screen. This option also
permits entering the letter 'S' to indicate seeding from a previous
run. The seed option differs significantly from reseeding in that all
the input variables can be reselected. It is analagous to adding a
drop of old culture to a new batch as compared to simply continuing the
incubation of the old batch.
This screen appears only when the defined option was previously
selected and 1, 2, or 3 genomes was entered. To enter a known genome,
type over the default or old genome using the letters 'E', 'F', 'G', or
'H' (upper or lower case is acceptable). The boxes on the right hand
side contain the percentage of each genome which will be represented in
the final population. When only one genome is entered this box is
always set at 100. In all other cases the total of all boxes (2 or 3)
must add to 100. An attempt to enter a value of more or less than 100
will not be accepted.