Acetobacterxylinum is a species of bacteria that produces a cellulose sheet called parchment. When grown in a liquid medium in the pH range of 3.5-4.5, it forms a thin cellulose film on the surface. Testing of three samples of Acetobacterxylinum at different ages ranging from 5 to 15 days showed increases in thickness and concentration of the parchment sheets as the cultures aged.

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4. : (Parchment) Acetobacterxylinum: , , : . . : :
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5. : (Parchment) Acetobacterxylinum11 Acetobacterxylinum(Parchment) pH 1 pH 11 pH 6.73 6.68 3.32 11 Brix 8 Brix 0.4 BrixpH 3.5 –4.5 11 Brix - 12 Brix2 Acetobacterxylinum5 , 10 , 15 11

6. 5 0.9 cm 0.7 cm 0.1 cm 10 1.1 cm 0.9 cm 0.2 cm 15 1.5 cm 1.2 cm 0.2 cm 1 2

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