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A B iological I ndicator E assessment R esistometer or ship BIER is the equipment used to determine the time taken to reduce bioload by 90% (also known as log reduction 1). The name comes from how the equipment is used. A BIER vessel evaluates the robustness of biological indicators against moist heat sterilization (steam). For example, if a 90% reduction is determined to be 5 minutes for the microorganism being evaluated, then the D-value of 5 is set. Specific D values ​​for starting bioload, substrate (spore material) and microbial species. BIER ships usually cost over $ 100 000US and therefore tend to be placed where biological indicators are made.
Source of the article : Wikipedia
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