A sample of E. coli has been subjected to heat for a specified time, and 90% of the cells have been destroyed. Which of the following terms best describes this event?
a. Thermal death point
b. Thermal death time
c. Decimal reduction time
d. None of the above

검증된 단계별 안내

Step 1: Understand the definitions of the terms given in the options. Thermal death point (TDP) is the lowest temperature at which all microorganisms in a liquid culture are killed in 10 minutes.

Step 2: Thermal death time (TDT) refers to the minimum time required to kill all microorganisms at a specific temperature.

Step 3: Decimal reduction time (D-value) is the time required at a certain temperature to reduce the microbial population by 90%, meaning to kill 90% of the cells.

Step 4: Since the problem states that 90% of the E. coli cells have been destroyed after heat treatment, this corresponds to the definition of decimal reduction time.

Step 5: Therefore, the term that best describes the event where 90% of cells are destroyed by heat is the decimal reduction time.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Thermal Death Point (TDP)

Thermal death point is the lowest temperature at which all microorganisms in a liquid culture are killed in 10 minutes. It indicates a specific temperature threshold for complete microbial destruction within a fixed time.

Thermal Death Time (TDT)

Thermal death time is the minimum time required to kill all microorganisms in a sample at a specific temperature. It measures how long heat must be applied to achieve total sterilization at that temperature.

Decimal Reduction Time (D-value)

Decimal reduction time is the time needed at a certain temperature to reduce the microbial population by 90%, or one log cycle. It quantifies the rate of microbial death under heat treatment, matching the scenario described.

A sample of E. coli has been subjected to heat for a specified time, and 90% of the cells have been destroyed. Which of the following terms best describes this event?a. Thermal death pointb. Thermal death timec. Decimal reduction timed. None of the above