Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Question
Chapter 2, Problem 20Q
Summary Introduction
To explain:
The difference in the results when a meter is multiplied with
Concept introduction:
Metric system is also called as the decimal system of measurement. Now, it is known as SI unit (International System of Unit). Scientists have adopted the metric system as the most common system of measurement of lengths and weights.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
You wish to quantify your favourite compound in an experimental solution using
spectrophotometry. First, you use standard solutions of your favourite compound to
collect the following standard curve data. Calculate the slope of the line of best fit
to two decimal places, and enter it in the box below the table.
Standard curve data
Conc (MM)
0.300
0.600
0.900
1.200
1.500
Abs
0.225
0.450
0.675
0.900
1.125
Next, you prepare an experimental sample by mixing 0.25 mL of the compound
solution with 9.75 mL of distilled water. Calculate the dilution factor and enter it as a
whole number (no decimals).
Next, you read an absorbance of 0.72 absorbance units for the diluted sample.
Calculate the concentration (mm) of the original solution of the compound. Round
this answer to one decimal place.
Previous Page
Next Page
MacBook Air
Page 5 of 13
It is possible to make a perfectly precise measurement?Explain.
You purchase a premix flour containing iron (Fe), riboflavin, niacin, thiamin, and folate. For
determination of Fe concentration in the flour sample, you conducted an atomic absorption
spectrometer (AAS) experiment using known concentration of Fe (standard). About 10 g of
flour sample is used and mixed in 100 mL of solution then measured using AAS.
1.2
0.8
0.6
0.4
0.2
8
10
12
-0.2
Fe concentration (mg/L)
[a] If the absorbance value of the flour sample is at 0.35, calculate the Fe concentration
presence in the flour sample (obtained equation from the standard curve is y = 0.1018x -
0.0514).
[b] Commonly, the Fe contents are in the range of 1.6 mg to 2.3 mg in 100 g super flour to
comply with FDA's standard of identity. Based on your calculation, justify if the Fe
concentration in the flour sample comply with the FDA specification.
Absorbance at 248.3 nm
Chapter 2 Solutions
Microbiology Fundamentals: A Clinical Approach
Ch. 2.1 - Explain what the Five Is are and what each step...Ch. 2.1 - Discuss three physical states of media and when...Ch. 2.1 - Compare and contrast selective and differential...Ch. 2.1 - Provide brief definitions for defined media and...Ch. 2.1 - Medical Moment The Making of the Flu Vaccine: An...Ch. 2.1 - Prob. 1NPCh. 2.1 - Prob. 2NPCh. 2.2 - Prob. 5AYPCh. 2.2 - Prob. 6AYPCh. 2.2 - Prob. 7AYP
Ch. 2.2 - Give examples of simple, differential, and special...Ch. 2.2 - Prob. 3NPCh. 2.2 - Medical Moment Gram-Positive Versus Gram-Negative...Ch. 2 - The identities of microorganisms on our planet a....Ch. 2 - Prob. 2QCh. 2 - Often bacteria that are freshly isolated from a...Ch. 2 - Which of these types of organisms is least likely...Ch. 2 - Prob. 5QCh. 2 - Some bacteria can produce a structure called an...Ch. 2 - A fastidious organism must be grown on what type...Ch. 2 - Write a short paragraph to differentiate among the...Ch. 2 - Prob. 9QCh. 2 - Viruses are commonly grown in/on a. animal cells...Ch. 2 - Can you devise a growth medium with ingredients...Ch. 2 - There is a type of differential medium that can...Ch. 2 - Prob. 13QCh. 2 - Several bacteria live naturally in a material on...Ch. 2 - Archaea often grow naturally in extreme...Ch. 2 - Prob. 16QCh. 2 - After performing the streak plate procedure on a...Ch. 2 - You are a scientist studying a marsh area...Ch. 2 - Prob. 19QCh. 2 - Prob. 20QCh. 2 - You perform the special stain for bacterial...Ch. 2 - Prob. 1VC
Knowledge Booster
Similar questions
- Given the following absorbance spectrum, to what wavelength should you set the spectrophotometer to measure your samples? Absorbance 400 500 600 Wavelength (nm) 700arrow_forwardCan paper chromatography be used to separate and identify very volatile substances? Explain your answer.arrow_forwardHow are these equal? How would I know to match these? 25 km = 25,000 m 2.5 cm = 2.5 × 104 μm 0.25 m = 2.5 × 108 nm 2.5 mm = 2.5 × 10-6 kmarrow_forward
- A 25.0 mL aliquot was taken from a 500.0 mL sample of tonic water containing an unknown amount of quinine and diluted to a volume of 150.0 mL. At 347.5 nm, the fluorescence intensity of the diluted sample was measured as 89.3 on an arbitrary scale. Under similar conditions, a 25.0 ppm standard quinine solution had a fluorescence intensity of 173. Calculate the mass of quinine in the original tonic water sample. mass: mg * TOOLS x10arrow_forwardA 46.60-gram pycnometer was filled with 100.50 grams of liquid. When filled with insoluble powder, the pycnometer weighs 84.60 grams. When the insoluble powder and liquid were combined, the pycnometer weighed 172.8 grams. What is the relative density of the insoluble powder? 2.1 2.6 3.1 None of the Abovearrow_forwardYou have a stock solution of 40% hydrogen peroxide. You need to make several dilutions for a calibration curve. Calculate how much volume of the stock hydrogen peroxide you need to make 50 mL of 11% hydrogen peroxide.arrow_forward
- A radiograph was produced using 80 kVp, 800 mA, .75 seconds and a 72 inches SID. In order to maintain the same density, how much time should be used with the following factors: 92 kVp, 200 mA, and 36 inches SID?arrow_forwardA biochemist carefully measures the molarity of salt in 56. mL of photobacterium cell growth medium to be 82. mM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 3.1 mL. Calculate the new molarity of salt in the photobacterium cell growth medium. Be sure your answer has the correct number of significant digits. | mMarrow_forward(b) Table Q1 below provides optical measurements of samples with known concentrations of analyte (ten samples were measured and the average and standard deviation are presented). They are also represented graphically in Figure Q1, below the table. Analyte concentration (nM) 0.1 0.2 0.5 1 2 5 10 15 fluorescence intensity 300000 250000 200000 150000 100000 50000 0 0 Table Q1 Fluorescence intensity (average) 9300 9200 10800 19600 37200 90000 178000 224000 5 [Analyte]/nM 10 Standard deviation 2000 1200 1000 2000 10000 30000 25000 40000 15 Figure Q1. Signal intensity for different analyte concentrations. Error bars are standard deviation. (ii) Calculate the limit of detection (LOD) for this sensor. (iii) A patient sample measured using this biosensor in the diagnostic laboratory generates a signal of 142800. The coefficient of variation of the device is 5%. Explain whether the diagnostic lab would have the confidence to report that the sample has a concentration in analyte of 8 nM or…arrow_forward
- Write shortly about the instrumentation of ATR spectroscopy? Answer should be to the point.arrow_forwardIn a spectrophotometer, what should be the appearance on the graph if the sample is pure? presence of salt and protein?arrow_forwardA scientist extracted compounds from apple peel and separated them using gel exclusion chromatography. Indicate which would be the expected order of elution from first eluted to last.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles Of Radiographic Imaging: An Art And A ...Health & NutritionISBN:9781337711067Author:Richard R. Carlton, Arlene M. Adler, Vesna BalacPublisher:Cengage Learning
Principles Of Radiographic Imaging: An Art And A ...
Health & Nutrition
ISBN:9781337711067
Author:Richard R. Carlton, Arlene M. Adler, Vesna Balac
Publisher:Cengage Learning