The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7, Problem 1A

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The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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a. Let’s say for example that a milk sample has 10,000 bacteria per milliliters. If 1 mL of this sample were plated out, these would theoretically be 10,000 colonies in the Petri plate. Discuss and explain the serial dilutions of this example. b. The disk diffusion method was used to evaluate 3 disinfectants. The results were as follows: Solution Zone of inhibition X 0 mm Y 5 mm Z 10 mm How would you interpret? Provide inference.

You spread 0.1 mL volume of a 10^(-6) dilution onto a nutrient agar plate. After 24 hours of incubation at 37°C, there were 280 colonies of bacteria on the plate. A.) What is the original concentration (OCD) of bacteria in the stock sample this dilution came from? B.) Using the OCD value from part A, determine the number of colonies that would be expected to grow on a plate that is inoculated with 0.1 mL volume of 10^(-8) dilution from this same stock of bacteria. Show your work for both.

You spread 0.1 mL volume of a 10^(-6) dilution onto a nutrient agar plate. After 24 hours of incubation at 37°C, there were 280 colonies of bacteria on the plate. A.) What is the original concentration (OCD) of bacteria in the stock sample this dilution came from? B.) Using the OCD value from part A, determine the number of colonies that would be expected to grow on a plate that is inoculated with 0.1 mL volume of 10^(-8) dilution from this same stock of bacteria.

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Chapter 7, Problem 1A

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Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7, Problem 1A

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The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7, Problem 1A

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Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7, Problem 1A

Summary Introduction

Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7, Problem 1A

Summary Introduction

Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

Answer 7

Chapter 7, Problem 1A

Summary Introduction

Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Ch. 7 - The thermal death time for a suspension of...Ch. 7 - If pasteurization does not achieve sterilization,...Ch. 7 - Thermal death point is not considered an accurate...Ch. 7 - Prob. 4R Ch. 7 - DRAW IT A bacterial culture was in log phase in...Ch. 7 - How do autoclaving, hot air, and pasteurization...Ch. 7 - How do salts and sugars preserve foods? Why are...Ch. 7 - Prob. 8R Ch. 7 - A large hospital washes burn patients in a...Ch. 7 - Prob. 10R

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

Solution Summary: The author describes the disk-diffusion method used to evaluate the efficacy of a chemical agent or to test the antibiotic sensitivity of bacteria.

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Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7 Solutions

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

Solution Summary: The author describes the disk-diffusion method used to evaluate the efficacy of a chemical agent or to test the antibiotic sensitivity of bacteria.

Concept explainers

Introduction: The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.

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Chapter 7 Solutions

Introduction:

The disk-diffusion method tests the effectiveness of antibiotics on a specific microorganism.