Question

a broth suspension containing 1.20E + 06 bacterial spores A with a D value of 2.3 minutes and 8.00E + 06 bacterial spores B with a D value of 15 minutes are both heated at 121.1 degrees Celsius.
a) calculate the time needed to obtain the final microbial amount of 1/1000
b) determine the D250 value if after 10 minutes of living spores there are only 30 spores

Answer 1

The answers are as follows:-

x) = priority vector.xlsx - Excel ? X FILE HOME INSERT PAGE LAYOUT FORMULAS DATA REVIEW VIEW Sign in > Calibri 11 Å Wrap Text General AutoSum 47 H % Cut EL Copy Format Painter PM A TI H Insert Delete Format Fill- Paste BIU- A Merge & Center - % 4.0 .00 .00 0 Conditional Format as Cell Formatting Table Styles Styles Clear Z Sort & Find & Filter Select Editing Clipboard Font Г Alignment F Number Cells 11 A B с D E F G H 1 J K L M N 0 Р Q R S T 1 2 3 4 A's count Initial count 1200000 D121.5 2.3 Final count 1200 B's count Initial count 8000000 D121.5 15 Final count 8000 5 6 7 Time:- 0121.5 (In No - In N) 8 9 Time (min.) 15.88784 Time (min.) 103.6163 10 11 12 13 14 15 Initial count 1200000 Time (min.) 10 Final count 30 8000000 10 D250 Initial count Time (min.) Final count 16 30 17 18 19 0.943696 min. 0.8004 min. D250 D250 20 56.62175 sec. 48.02399 sec. 21 22 23 Stress and Strain Weibull Stress factor Heat Transfer Bode plot equation solver Machine A-B D-value in microbial Speed n distance C ... + READY + 100% Search the web and Windows SW р w . PA A D ) ENG 12:51 24-06-2020

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