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F.Musumeci, A.Scordino, A.Triglia
Instituto di Fisica della Facolta' di Ingegneria - Universita' di Catania
Vle A Doria 6 - 95129 - Catania - Italia
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Instituto di Fisica |
 Introduction
Material
and Methods
Experimental
Results and Discussion
Experimental
Results and Discussion (cont.)
Experimental
Results and Discussion (cont.)
Conclusion
References |
Page 5 of 7 |
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As it concerns the dependence of the dynamics on the temperature fig. 8a shows the behaviour of the DL of one acetabularia sample submitted to a temperature of 40 C°. It is possible to see that DL is not stable at all. The DL in fact decrease in a irreversible way and, after some time, the sample dies.
fig 8 - Changes of D.L of an Acetabularia
sample submitted to non physiological temperatures ; the different trends
are referred to the time of measurement starting from the submission of
acetabularia to the non physiological temperature:
(n)
.5 hour after , (o)
1 hour after, (+) 2 hour after, (*) 4 hour after
a)Temperature of submission 40 °C
b)Temperature of submission 0 °C
A different behaviour is shown in fig. 8b that reports the DL of one acetabularia sample submitted to a temperature of 0 °C . It is possible to see that DL is stable at all and the sample seems not damaged even after some days of permanence at this temperature.
This decreasing of the DL emission at relatively high temperatures probably is connected to the damages that the high temperature causes on the functional structure of the Acetabularia. In fact even if, after a quickly freezing in liquefied air, an Acetabularia sample is brought again to its normal temperature, the DL emission behaves as it was exposed to high temperature.
From the previous results it is evident that there are two temperature regimes the first one , with stable DL, corresponding to the range of temperature within which the Acetabularia could survive, and the second one, with DL continuously decreasing, corresponding to damaging temperature.
In the first regime it seems that it is possible to change the state of the Acetabularia and then to return back.
In some case a kind of cycle appear for the DL parameters : fig. 9a and 9b show this cycles for the total number of counts and for the slope of hyperbolic decay :
fig. 9 - Behaviour of two parameters
of D.L. for two Acetabularia samples on varying the temperature:
a)total number of counts
b)slope m of eq. 1.
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