Skip to main content
Ch. 7 - The Control of Microbial Growth
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tortora 14th EditionCh. 7 - The Control of Microbial Growth문제 6
4장, 문제 6

Use the following information to answer questions 6 and 7. The data were obtained from a use-dilution test comparing four disinfectants against Salmonella Choleraesuis.
G = growth, NG = no growth
Table showing bacterial growth results for four disinfectants at various dilutions; NG indicates no growth, G indicates growth.
Which disinfectant is the most effective?

검증된 단계별 안내
1
Identify the criteria for effectiveness in the context of the dilution test. Typically, the most effective disinfectant is the one that prevents bacterial growth (NG) at the highest dilution (lowest concentration).
Examine the data table or image provided, focusing on the dilution levels for each disinfectant and noting where growth (G) or no growth (NG) occurs.
For each disinfectant, find the highest dilution factor at which no growth (NG) is observed. This indicates the lowest concentration needed to inhibit Salmonella Choleraesuis.
Compare these highest effective dilutions across all four disinfectants to determine which one inhibits growth at the greatest dilution (i.e., is effective at the lowest concentration).
Conclude that the disinfectant with the highest dilution showing no growth is the most effective against Salmonella Choleraesuis.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
3m
도움이 되었나요?

주요 개념

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

Use-Dilution Test

A use-dilution test measures the effectiveness of disinfectants by exposing bacteria to different disinfectant concentrations and then checking for bacterial growth. It helps determine which disinfectant can inhibit or kill the bacteria at practical usage levels.
추천 영상:
06:59
The Ames Test

Bacterial Growth Indicators (G vs NG)

In microbiology tests, 'G' indicates bacterial growth, meaning the disinfectant failed to kill or inhibit the bacteria, while 'NG' means no growth, showing effective bacterial control. These indicators help compare disinfectant efficacy.
추천 영상:
05:21
Types of Disinfectants

Disinfectant Efficacy Against Salmonella Choleraesuis

Effectiveness of disinfectants varies depending on the target organism. Salmonella Choleraesuis is a pathogenic bacterium, so the most effective disinfectant is the one that consistently prevents its growth, ensuring safety and infection control.
추천 영상:
05:21
Types of Disinfectants
관련 실천
교과서 질문

Which of the following is used to control microbial growth in foods?

a. Organic acids

b. Alcohols

c. Aldehydes

d. Heavy metals

e. All of the above

1068
views
교과서 질문

How do salts and sugars preserve foods? Why are these considered physical rather than chemical methods of microbial control? Name one food that is preserved with sugar and one preserved with salt. How do you account for the occasional growth of Penicillium mold in jelly, which is 50% sucrose?

1351
views
교과서 질문

The antimicrobial effect of gamma radiation is due to:(a) ________.

The antimicrobial effect of ultraviolet radiation is due to: (b) ________.

1314
views
교과서 질문

How do autoclaving, hot air, and ultra-high-temperature pasteurization illustrate the concept of equivalent treatments?

807
views
교과서 질문

A bacterial culture was in log phase in the following figure. At time x, an antibacterial compound was added to the culture. Draw the lines indicating the addition of a bactericidal compound and a bacteriostatic compound. Explain why the viable count does not immediately drop to zero at x.

1470
views
교과서 질문

Use the following information to answer questions 6 and 7. The data were obtained from a use-dilution test comparing four disinfectants against Salmonella Choleraesuis.

G = growth, NG = no growth

Which disinfectant(s) is (are) bactericidal?

a. A,B,C, and D

b. A,C, and D

c. A only

d. B only

e. None of the above

682
views