Team:Technion HS Israel/Modelling/Equations

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Full equations

1 Notations

1.1 Notation principles

Every relevant substance in the cell is denoted with uppercase letters which describes the substance, and a subscript which encodes the scale in which the amount of the substance is measured by the variable. For example, if we have a substance Y,

• its amount inside a single cell is denoted by Y_in
• its amount inside all the cells together (its total amount inside the cells) is denoted by Y_sum
• its amount outside all the cells (its external amount) is denoted by Y_out

2 A list of all the notations we used

Substances:

• A - AHL (The auto inducer, a short for N-Acyl homoserine lactone).
• L - LuxR (a transciptional activator protein)
• LA - the complex LuxR and AHL form together.
• LA₂ - the dimer we get when two LuxR-AHL complexes bind together.
• aa - Aiia (a AHL-lactonase).
• a₁ - plasmids with an unactivated LuxR promotor.
• a₂ - plasmids with an activated LuxR promotor.
• RNA_TetR - RNA strands of the TetR gene.
• TetR - Tet Repressor protein we use.
• b₀ - plasmids with an unactivated Tet promotor.
• b₁ - plasmids with an activated Tet promotor.
• RNA_ccdb - RNA strands of the ccdb gene.
ccbd - Toxin we use to kill the cell.
• X - any gene we want to measure the amount of it that will be produced by the bacteria colony. For example, it might represent the amount of a certain drug the bacteria produce.

Other quantitie of interest:

• N - number of bacteria. The bacteria are divided to two groups
•    N⁺ - bacteria with our plasmid.
•    N^- - bacteria without our plasmid (in other words, bacteria that lost the plasmids we introduced into them).
• V - volume of the relevant scale. That means,
  •    V_out - the volume of the space outside the cells.
   
  •   V_sum - the volume of the total space inside all the cells.
• w - width of the cell membrane.

Constants

• C1 - C18 - different reaction constants.
• T⁺ - plamid positive generation time.
• T^- - plamid free generation time.
• p - the chance to loose a plasmid.
• D- AHL diffusion constant.

3 Reactions

Initial conditions

• AHL_out - how much AHL we put.
• a0 - initial number of strands (probably plasmid number).
• a1 - 0.
• b0 - initial number of strands (probably plasmid number). Sounds equal to a₀(t=0) .
• b1 - 0.
• N⁺ - the number of cells we have at the beginning.
• N^- - 0.
• all the rest - 0.