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biologia - Studia

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Atm PROTEIN CAN SWITCH OFF THE DNA DAMAGE SIGNAL IN A p53 MODEL<br />

If Λ ≤ 0 then change of sign of ∆ makes a bifurcation which is showed<br />

through cases ( a ),( b)<br />

and (c)<br />

(see the table A and the figure 6). This proves part<br />

(1) of the theorem .<br />

If Λ > 0 then change of the sign of Ω makes a bifurcation which is<br />

showed through cases ( c ),( d),(<br />

e)<br />

and ( f ) (see the table A and the figure 6). This<br />

proves part (2) of the theorem.<br />

Table A: here as mentioned before, g ( z 1<br />

) , 0 < z<br />

1<br />

< µ ,<br />

is the only local minimum value for g (z)<br />

.<br />

z1 ≤ 0, g(0)<br />

> 0<br />

(a)<br />

z1 ≤ 0, g(0)<br />

= 0<br />

(b)<br />

g ( z 1<br />

), g(0)<br />

< 0<br />

(c)<br />

z<br />

1<br />

> 0, g(0)<br />

> 0 > g(<br />

z1)<br />

(d)<br />

z<br />

1<br />

> 0, g(0)<br />

> g(<br />

z1)<br />

> 0 (e)<br />

z 0, g(0)<br />

> 0 = g(<br />

) (f)<br />

1<br />

> z1<br />

Fig. 5. According to the rows of table A, here we draw all possible plots for G (g)<br />

.<br />

77

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