Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
12th Edition
ISBN: 9780134605203
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 20, Problem 2CT
Summary Introduction

To determine:

The method for obtaining the desired cell concentration form the 24-hour flask along with plotting graph of data given.

Introduction:

Microbial culture or microbiological culture is a technique of growing microorganisms by allowing them to reproduce on a predefined culture media under laboratory conditions. These cultures are used to study the microbe and its plentitude in the sample.

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The number of bacterial cells in a culture broth is to be determined by a culture technique. Serial dilutions were performed and a 1 mL aliquot from each dilution was mixed with warm molten agar and poured into a Petri dish. The numbers of bacterial colony forming units (CFU) after overnight incubation are shown in the table below. What is the number of colony forming units per mL of the culture broth? Choose only the most appropriate plate for your calculation. Give your answer as the number only (do not add text for the units). You may use scientific notation with the format 1.12e+6 (that is, 1.12 x 106 cfu/mL). (Note: Canvas will then display your answer a whole number.) Plate Dilution Plate 1 10 dilution Plate 2 10 dilution -5 Plate 3 10 dilution Plate 4 10 dilution Plate 5 107 dilution -8 Plate 6 100 dilution *Too many to count Number of colony forming units (CFU) TMTC* TMTC* TMTC* 867 154 18
The number of bacterial cells in a culture broth is to be determined by a culture technique. Serial dilutions were performed and a 1 mL aliquot from each dilution was mixed with warm molten agar and poured into a Petri dish. The numbers of bacterial colony forming units (CFU) after overnight incubation are shown in the table below. What is the number of colony forming units per mL of the culture broth? Choose only the most appropriate plate for your calculation. Give your answer as the number only (do not add text for the units). You may use scientific notation with the format 1.12e+6 (that is, 1.12 x 106 cfu/mL). (Note: Canvas will then display your answer a whole number.) Plate Dilution -3 Plate 1 10 dilution Plate 2 10-4 dilution Plate 3 10-5 dilution Plate 4 10 dilution Plate 5 10 dilution -8 Plate 6 100 dilution *Too many to count Number of colony forming units (CFU) TMTC* 1,957 65 21 1 0 m
Describe how you would prepare a dilution series of a 1 x 107 CFU/mL culture to the 10-8 dilution using only 4.5 mL diluents in tubes. What would be the theoretical cell count if 0.1 mL of the 2nd and 4th dilutions were each plated?
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