Difference between revisions of "Part:BBa K1065311"

Figure 1 Effect of EFE on cell growth. Cell density was measured at different time points to determine the effect of EFE expression. Cells were grown at 37 °C in LB until it was reached an OD of 0.6. The cells were then splitted in four samples of equal volume. Two samples were then induced with 5 mM Arabinose. Induced samples show a slowed growth rate, as espected (5mM arabinose is a strong induction that causes stress on cells). However, cell growth is not completely inhibited so EFE is not highly toxic

Figure 2 Ethylene detection with an Agilent 3000 Micro GC set up with a plot U column. Cells were grown until O.D.600 reached 0.5. The cells were then splitted in two samples of equal volume (3 ml) and putted into an hermetically closed vial with a septum with a rubber cap. One of the two sample was induced with 5 mM Arabinose. The vials were left in the thermoshaker for 4 hours. After that, the vials were connected to a micro GC and a measure was taken. Panel A: a 1.5 ml sample induced (green curve) and 3 ml sample induced (red curve) showed a characteristic peak corresponding to Ethylene. On the other hand, the 3 ml not induced sample (blue curve) didn't show the peak. Ethylene was estimated to be 61 ± 15 ppm for the 1.5 ml culture and 101 ± 15 ppm for the 3 ml culture. Panel B: picture of the vial connected to the micro GC.

Figure 3 Kinetic assay for Ethylene production. Cells were grown until an O.D. of 0.5 - 0.8 and then connected to the micro GC, while in agitation on a thermoblock at 37 °C for the entire duration of the experiment. Every 45/60 mins a meausure was taken for a total of about 8 hours. Samples were induced at two differents O.D.600 and this had big effect on the amount of ethylene produced. However, it seems that the Ethylene concentration in the air space reached saturation after only two hours. The red dashed line indicates the amount of ethylene detected with a culture left in the thermoshaker for the all duration of the experiment and subjected to only one measurement. As expected an higher value of ethylene was measured due to the minimal gas loss with this approach.

Figure 4 Acceleration of fruit ripening. Panel A: our system was exploited for the acceleration of fruit ripening. We designed an hermetically closed jar with a rubber hose connector. These jars contained our test-fruit and each one was connected to a flask. The flasks contained 300 ml of induced (or not) culture when O.D.600 reached 0.8. The flasks contained a cultures maintained at 37 °C using a laboratory heating plate while stirring. For four to six days, every morning the culture in the flasks was substituted with a new induced (or not) culture. Furthermore, non-modified jars (i.e.: with no connector) were adopted to contain the negative control fruit samples (no-cells). Panel B: ripening of plums. Plum exposed to ethylene, show a more advanced stage of ripening after 4 days of treatment when compared to two negative controls (no-cells and BBa_K1065001 not induced).

Frigure 5 Cells transformed with BBa_K1065311: pellets after induction time. We induced cultures snice O.D. reached 0.7 for about 10 hours with a blue LED (2) instead the control (1) was covered with aluminum foil and taken in complete darkness. we can notice a substantial difference between pelletts' colors. AmilCP production probably reflects ethylene synthesis (not measured yet). We are in the process of characterizing this part more properly and getting some gas-chromatographic.