Team:Jilin China/Modeling

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As the picture shows, higher the concentration of formaldehyde is, the later the number of E.coli DH5αreach the lowest point. So at first the high concentration may not beneficial to the growth of the bacterias. But when they adapt to the high concentration, they can live longer compared to those in the lower concentration. Therfore, E.coli’s life span also depend on formaldehyde concentration. But no matter what the concentration is, E.coli will become inactive after 40 hours culturing.

According to Fig.2, FDH and PADH indeed have a great effect on degrading formaldehyde. In the first 3h, the concentration of formaldehyde drops quickly. 32% formaldehyde gas has been absorbed. In the later 5 to 7 hours, the absorbing rate starts to be slower. Finally, these two enzymes degrade 42% formaldehyde.

At first, we used UV absorption spectrum method with ultraviolet light, 660nm, to detect population of E.coli. As a result, due to the limited culture medium, the amount of bacteria would descend after 1.5h breed. However, most of the time, what determines the amount of E.coli is not the nutrient, but other conditions, such as living space or temperature. Because researchers can ignore the nutrient by adding more fresh culture medium. Thus, we picked up 11 points between 0 to 1.5h to structure growth curve (Figure 1) and aborted other points.