Microbiology, 2021

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278 7 • Microbial Biochemistry Figure 7.24 The normal CFTR protein is a channel protein that helps salt (sodium chloride) move in and out of cells. Figure 7.25 (a) A scanning electron micrograph shows the opportunistic bacterium Pseudomonas aeruginosa. (b) Pigment-producing P. aeruginosa on cetrimide agar shows the green pigment called pyocyanin. (credit a: modification of work by the Centers for Disease Control and Prevention) LINK TO LEARNING For more information about cystic fibrosis, visit the Cystic Fibrosis Foundation (https://openstax.org/l/ 22cystfibrofoun) website. 7.5 Using Biochemistry to Identify Microorganisms Learning Objectives By the end of this section, you will be able to: • Describe examples of biosynthesis products within a cell that can be detected to identify bacteria Accurate identification of bacterial isolates is essential in a clinical microbiology laboratory because the Access for free at openstax.org.
7.5 • Using Biochemistry to Identify Microorganisms 279 results often inform decisions about treatment that directly affect patient outcomes. For example, cases of food poisoning require accurate identification of the causative agent so that physicians can prescribe appropriate treatment. Likewise, it is important to accurately identify the causative pathogen during an outbreak of disease so that appropriate strategies can be employed to contain the epidemic. There are many ways to detect, characterize, and identify microorganisms. Some methods rely on phenotypic biochemical characteristics, while others use genotypic identification. The biochemical characteristics of a bacterium provide many traits that are useful for classification and identification. Analyzing the nutritional and metabolic capabilities of the bacterial isolate is a common approach for determining the genus and the species of the bacterium. Some of the most important metabolic pathways that bacteria use to survive will be discussed in Microbial Metabolism. In this section, we will discuss a few methods that use biochemical characteristics to identify microorganisms. Some microorganisms store certain compounds as granules within their cytoplasm, and the contents of these granules can be used for identification purposes. For example, poly-β-hydroxybutyrate (PHB) is a carbon- and energy-storage compound found in some nonfluorescent bacteria of the genus Pseudomonas. Different species within this genus can be classified by the presence or the absence of PHB and fluorescent pigments. The human pathogen P. aeruginosa and the plant pathogen P. syringae are two examples of fluorescent Pseudomonas species that do not accumulate PHB granules. Other systems rely on biochemical characteristics to identify microorganisms by their biochemical reactions, such as carbon utilization and other metabolic tests. In small laboratory settings or in teaching laboratories, those assays are carried out using a limited number of test tubes. However, more modern systems, such as the one developed by Biolog, Inc., are based on panels of biochemical reactions performed simultaneously and analyzed by software. Biolog’s system identifies cells based on their ability to metabolize certain biochemicals and on their physiological properties, including pH and chemical sensitivity. It uses all major classes of biochemicals in its analysis. Identifications can be performed manually or with the semi- or fully automated instruments. Another automated system identifies microorganisms by determining the specimen’s mass spectrum and then comparing it to a database that contains known mass spectra for thousands of microorganisms. This method is based on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) and uses disposable MALDI plates on which the microorganism is mixed with a specialized matrix reagent (Figure 7.26). The sample/reagent mixture is irradiated with a high-intensity pulsed ultraviolet laser, resulting in the ejection of gaseous ions generated from the various chemical constituents of the microorganism. These gaseous ions are collected and accelerated through the mass spectrometer, with ions traveling at a velocity determined by their mass-to-charge ratio (m/z), thus, reaching the detector at different times. A plot of detector signal versus m/z yields a mass spectrum for the organism that is uniquely related to its biochemical composition. Comparison of the mass spectrum to a library of reference spectra obtained from identical analyses of known microorganisms permits identification of the unknown microbe. Figure 7.26 MALDI-TOF methods are now routinely used for diagnostic procedures in clinical microbiology laboratories. This technology is able to rapidly identify some microorganisms that cannot be readily identified by more traditional methods. (credit “MALDI plate photo”: modification of work by Chen Q, Liu T, Chen G; credit “graphs”: modification of work by Bailes J, Vidal L, Ivanov DA, Soloviev M)
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Microbiology SENIOR CONTRIBUTING AU
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OPENSTAX OpenStax provides free, pe
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Contents Preface 1 CHAPTER 1 An Inv
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9.2 Oxygen Requirements for Microbi
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18.1 Overview of Specific Adaptive
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Appendix C Metabolic Pathways 1155
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Preface 1 PREFACE Welcome to Microb
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Preface 3 that often confer critica
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Preface 5 further. Our features inc
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Preface 7 and science, and pursues
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CHAPTER 1 An Invisible World Figure
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1.1 • What Our Ancestors Knew 11
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1.2 • A Systematic Approach 17 Th
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1.2 • A Systematic Approach 19 Fi
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1.2 • A Systematic Approach 21 Ta
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1.3 • Types of Microorganisms 23
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1 • Summary 31 SUMMARY 1.1 What O
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1 • Review Questions 33 17. The p
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CHAPTER 2 How We See the Invisible
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2.1 • The Properties of Light 37
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2.1 • The Properties of Light 39
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2.2 • Peering Into the Invisible
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2.3 • Instruments of Microscopy 4
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2.4 • Staining Microscopic Specim
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2 • Review Questions 71 REVIEW QU
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CHAPTER 3 The Cell Figure 3.1 Micro
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3.1 • Spontaneous Generation 75 F
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3.2 • Foundations of Modern Cell
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3.3 • Unique Characteristics of P
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3.4 • Unique Characteristics of E
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3 • Summary 125 SUMMARY 3.1 Spont
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3 • Review Questions 127 3. Which
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3 • Review Questions 129 Critical
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CHAPTER 4 Prokaryotic Diversity Fig
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4.1 • Prokaryote Habitats, Relati
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4.2 • Proteobacteria 139 for or s
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4.2 • Proteobacteria 141 Class Al
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4.2 • Proteobacteria 143 Class Be
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4.2 • Proteobacteria 145 Figure 4
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4.2 • Proteobacteria 147 Class Ga
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4.3 • Nonproteobacteria Gram-Nega
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4.4 • Gram-Positive Bacteria 157
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4.6 • Archaea 167 The class Therm
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4.6 • Archaea 169 thus is a livin
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4 • Summary 171 SUMMARY 4.1 Proka
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4 • Review Questions 173 REVIEW Q
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4 • Review Questions 175 39. Expl
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CHAPTER 5 The Eukaryotes of Microbi
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5.1 • Unicellular Eukaryotic Para
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Figure 5.7 5.1 • Unicellular Euka
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5.2 • Parasitic Helminths 193 hel
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5.2 • Parasitic Helminths 195 Fig
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5.2 • Parasitic Helminths 197 Fig
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5.2 • Parasitic Helminths 199 MIC
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5.3 • Fungi 201 Figure 5.25 Multi
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5.3 • Fungi 203 Figure 5.27 zygos
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5.3 • Fungi 205 diploid stages (F
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5.3 • Fungi 207 Figure 5.32 prese
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5.3 • Fungi 209 MICRO CONNECTIONS
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5.4 • Algae 211 and other photosy
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5.5 • Lichens 213 Figure 5.37 Chl
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5.5 • Lichens 215 marina. (b) Thi
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5 • Review Questions 217 REVIEW Q
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CHAPTER 6 Acellular Pathogens Figur
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6.1 • Viruses 221 assembly of vir
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6.1 • Viruses 223 Viral Structure
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6.1 • Viruses 225 Figure 6.5 (a)
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Page 267 and 268: 6 • Summary 253 SUMMARY 6.1 Virus
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Page 271 and 272: CHAPTER 7 Microbial Biochemistry Fi
Page 273 and 274: 7.1 • Organic Molecules 259 Figur
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Page 277 and 278: 7.2 • Carbohydrates 263 and the m
Page 279 and 280: 7.2 • Carbohydrates 265 Figure 7.
Page 281 and 282: 7.3 • Lipids 267 Figure 7.11 Star
Page 283 and 284: 7.3 • Lipids 269 Figure 7.13 This
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Page 287 and 288: 7.4 • Proteins 273 Figure 7.17 Am
Page 289 and 290: 7.4 • Proteins 275 Figure 7.19 Re
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Page 317 and 318: 8.3 • Cellular Respiration 303 Fi
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CHAPTER 9 Microbial Growth Figure 9
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9.1 • How Microbes Grow 331 and a
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9.1 • How Microbes Grow 333 The G
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9.1 • How Microbes Grow 335 Susta
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9.1 • How Microbes Grow 337 chang
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9.1 • How Microbes Grow 339 Figur
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9.1 • How Microbes Grow 341 trans
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9.1 • How Microbes Grow 343 micro
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9.2 • Oxygen Requirements for Mic
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9.3 • The Effects of pH on Microb
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9.4 • Temperature and Microbial G
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9.4 • Temperature and Microbial G
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9.5 • Other Environmental Conditi
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9.6 • Media Used for Bacterial Gr
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9 • Summary 361 SUMMARY 9.1 How M
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9 • Review Questions 363 7. Filam
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9 • Review Questions 365 Matching
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9 • Review Questions 367 Critical
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CHAPTER 10 Biochemistry of the Geno
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10.1 • Using Microbiology to Disc
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10.2 • Structure and Function of
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10 • Summary 401 SUMMARY 10.1 Usi
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10 • Review Questions 403 3. Whic
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10 • Review Questions 405 Short A
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CHAPTER 11 Mechanisms of Microbial
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11.1 • The Functions of Genetic M
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11.2 • DNA Replication 411 Figure
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11.2 • DNA Replication 413 Figure
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11.2 • DNA Replication 415 strand
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11.2 • DNA Replication 417 telome
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11.3 • RNA Transcription 419 Figu
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11.3 • RNA Transcription 421 the
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11.4 • Protein Synthesis (Transla
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11.5 • Mutations 429 Effects of M
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11.5 • Mutations 431 In recent ye
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11.5 • Mutations 433 Figure 11.20
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11.5 • Mutations 435 formation of
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11.6 • How Asexual Prokaryotes Ac
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11.7 • Gene Regulation: Operon Th
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11 • Summary 457 SUMMARY 11.1 The
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11 • Summary 459 undamaged DNA st
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11 • Review Questions 461 11. Whi
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11 • Review Questions 463 46. ___
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71. The following figure is from Mo
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CHAPTER 12 Modern Applications of M
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12.1 • Microbes and the Tools of
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12.2 • Visualizing and Characteri
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12.3 • Whole Genome Methods and P
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12.3 • Whole Genome Methods and P
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12.4 • Gene Therapy 499 Figure 12
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12.4 • Gene Therapy 501 overall w
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12 • Summary 503 SUMMARY 12.1 Mic
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12 • Review Questions 505 11. The
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CHAPTER 13 Control of Microbial Gro
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13.1 • Controlling Microbial Grow
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13.2 • Using Physical Methods to
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13.3 • Using Chemicals to Control
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13.4 • Testing the Effectiveness
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13 • Summary 553 commonly used to
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13 • Review Questions 555 12. Ble
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CHAPTER 14 Antimicrobial Drugs Figu
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14.1 • History of Chemotherapy an
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14.1 • History of Chemotherapy an
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14.2 • Fundamentals of Antimicrob
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14.2 • Fundamentals of Antimicrob
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14.3 • Mechanisms of Antibacteria
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14.4 • Mechanisms of Other Antimi
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14.5 • Drug Resistance 591 Common
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14.5 • Drug Resistance 593 negati
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14.5 • Drug Resistance 595 Clavul
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14.7 • Current Strategies for Ant
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14.7 • Current Strategies for Ant
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14 • Summary 605 cells. • Becau
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14 • Review Questions 609 50. Why
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CHAPTER 15 Microbial Mechanisms of
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15.1 • Characteristics of Infecti
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15.2 • How Pathogens Cause Diseas
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15.3 • Virulence Factors of Bacte
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15.4 • Virulence Factors of Eukar
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15.4 • Virulence Factors of Eukar
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15 • Review Questions 647 protect
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15 • Review Questions 649 Critica
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CHAPTER 16 Disease and Epidemiology
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16.1 • The Language of Epidemiolo
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16.1 • The Language of Epidemiolo
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16.2 • Tracking Infectious Diseas
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16.3 • Modes of Disease Transmiss
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16.4 • Global Public Health 673 C
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16.4 • Global Public Health 675 S
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16 • Summary 677 SUMMARY 16.1 The
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16 • Review Questions 679 Matchin
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16 • Review Questions 681 20. Wha
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CHAPTER 17 Innate Nonspecific Host
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17.1 • Physical Defenses 685 Over
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17.1 • Physical Defenses 687 know
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17.1 • Physical Defenses 689 Figu
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17.2 • Chemical Defenses 691 Phys
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17.2 • Chemical Defenses 693 sali
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17.2 • Chemical Defenses 695 prod
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17.2 • Chemical Defenses 697 Figu
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17.2 • Chemical Defenses 699 Clin
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17.3 • Cellular Defenses 701 Hema
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17.3 • Cellular Defenses 703 stra
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17.3 • Cellular Defenses 705 Clin
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17.3 • Cellular Defenses 707 Figu
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17.4 • Pathogen Recognition and P
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17.4 • Pathogen Recognition and P
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17.5 • Inflammation and Fever 713
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17 • Summary 719 SUMMARY 17.1 Phy
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17 • Review Questions 721 8. Hist
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17 • Review Questions 723 Short A
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CHAPTER 18 Adaptive Specific Host D
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18.1 • Overview of Specific Adapt
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18.2 • Major Histocompatibility C
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18.3 • T Lymphocytes and Cellular
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18.4 • B Lymphocytes and Humoral
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18.4 • B Lymphocytes and Humoral
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18.5 • Vaccines 751 pathogen—bu
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18.5 • Vaccines 753 Eye on Ethics
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18.5 • Vaccines 755 for Disease C
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18.5 • Vaccines 757 Classes of Va
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18 • Summary 759 SUMMARY 18.1 Ove
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18 • Review Questions 761 5. MHC
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18 • Review Questions 763 20. Mat
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CHAPTER 19 Diseases of the Immune S
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19.1 • Hypersensitivities 767 Fig
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19.1 • Hypersensitivities 769 bin
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19.1 • Hypersensitivities 771 mec
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19.1 • Hypersensitivities 775 CHE
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19.1 • Hypersensitivities 777 Cli
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19.1 • Hypersensitivities 779 MIC
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19.2 • Autoimmune Disorders 783 t
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19.2 • Autoimmune Disorders 785 F
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19.2 • Autoimmune Disorders 787 M
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19.2 • Autoimmune Disorders 789 F
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19.3 • Organ Transplantation and
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19.4 • Immunodeficiency 793 and m
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19.4 • Immunodeficiency 795 CHECK
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19.5 • Cancer Immunobiology and I
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19 • Summary 799 SUMMARY 19.1 Hyp
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19 • Review Questions 801 13. All
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CHAPTER 20 Laboratory Analysis of t
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20.1 • Polyclonal and Monoclonal
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20.2 • Detecting Antigen-Antibody
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20.3 • Agglutination Assays 823 a
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20.3 • Agglutination Assays 825 F
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20.3 • Agglutination Assays 827 e
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20.3 • Agglutination Assays 829 s
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20.4 • EIAs and ELISAs 831 Mechan
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20.4 • EIAs and ELISAs 833 Figure
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20.4 • EIAs and ELISAs 837 • Wh
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20.5 • Fluorescent Antibody Techn
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20 • Review Questions 849 20.4 EI
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20 • Review Questions 851 15. Sup
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CHAPTER 21 Skin and Eye Infections
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21.1 • Anatomy and Normal Microbi
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21.2 • Bacterial Infections of th
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21.3 • Viral Infections of the Sk
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21.3 • Viral Infections of the Sk
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21.4 • Mycoses of the Skin 881 se
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21.4 • Mycoses of the Skin 883 fr
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21.4 • Mycoses of the Skin 885 Fi
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21.5 • Protozoan and Helminthic I
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21.5 • Protozoan and Helminthic I
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21 • Summary 891 SUMMARY 21.1 Ana
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CHAPTER 22 Respiratory System Infec
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22.3 • Viral Infections of the Re
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22.4 • Respiratory Mycoses 931 ha
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22.4 • Respiratory Mycoses 933 Fi
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22.4 • Respiratory Mycoses 935 re
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Figure 22.29 22.4 • Respiratory M
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22 • Review Questions 939 200 vir
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CHAPTER 23 Urogenital System Infect
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23.5 • Fungal Infections of the R
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23.6 • Protozoan Infections of th
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23 • Summary 975 SUMMARY 23.1 Ana
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CHAPTER 24 Digestive System Infecti
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24.2 • Microbial Diseases of the
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24.4 • Viral Infections of the Ga
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24.6 • Helminthic Infections of t
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24 • Summary 1033 SUMMARY 24.1 An
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CHAPTER 25 Circulatory and Lymphati
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25.1 • Anatomy of the Circulatory
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25.1 • Anatomy of the Circulatory
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25.3 • Viral Infections of the Ci
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Figure 25.26 25.3 • Viral Infecti
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25.4 • Parasitic Infections of th
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25 • Review Questions 1089 • To
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25 • Review Questions 1091 Critic
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CHAPTER 26 Nervous System Infection
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26.1 • Anatomy of the Nervous Sys
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26.1 • Anatomy of the Nervous Sys
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26.2 • Bacterial Diseases of the
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26.3 • Acellular Diseases of the
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Figure 26.19 26.3 • Acellular Dis
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26.4 • Fungal and Parasitic Disea
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26 • Review Questions 1133 are fa
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26 • Review Questions 1135 Matchi
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26 • Review Questions 1137 59. Th
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A • Fundamentals of Physics and C
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B • Mathematical Basics 1149 APPE
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B • Mathematical Basics 1151 Mult
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B • Mathematical Basics 1153 The
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C • Metabolic Pathways 1155 APPEN
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C • Metabolic Pathways 1157 Entne
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C • Metabolic Pathways 1159 Figur
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C • Metabolic Pathways 1161 Elect
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APPENDIX D Taxonomy of Clinically R
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D • Taxonomy of Clinically Releva
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E • Glossary 1177 APPENDIX E Glos
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E • Glossary 1179 destruction by
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E • Glossary 1181 pollutants from
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E • Glossary 1183 chromosome disc
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E • Glossary 1185 cysts are forme
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E • Glossary 1187 occurring ectop
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E • Glossary 1189 molecules of DN
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E • Glossary 1191 glycoprotein co
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E • Glossary 1193 image point is
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E • Glossary 1195 discontinuously
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E • Glossary 1197 infection cause
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E • Glossary 1199 target cells by
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E • Glossary 1201 intact ribosome
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E • Glossary 1203 point source sp
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E • Glossary 1205 complexes forme
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E • Glossary 1207 antibody is fir
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E • Glossary 1209 the number of c
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E • Glossary 1211 the reciprocal
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E • Glossary 1213 vector animal (
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1215 ANSWER KEY Chapter 1 1. D 2. D
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1217 B 18. A, C, B 19. peristalsis
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Index 1219 INDEX Symbols +ssRNA 237
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Index 1221 antigen-presenting cells
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Index 1223 Bordetella 142 Bordetell
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Index 1225 chromosomes 372, 394 chr
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Index 1227 de Duve 113 dead zone 35
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Index 1229 Enteroinvasive E. coli (
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Index 1231 Gardnerella vaginalis 47
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Index 1233 shunt 298 Hfr cell 443 H
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Index 1235 iron lungs 1118 iron-sul
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Index 1237 maturation 230 mature na
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Index 1239 Health 501 National Noti
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Index 1241 patterns (PAMPs) 710 pat
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Index 1243 primary lymphoid tissue
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Index 1245 596, 1048, 1051, 1051 ri
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Index 1247 sterilant 511, 541 steri
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Index 1249 toxigenicity 633 toxin 6
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Index 1251 water activity 522 water
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Microbiology, 2021

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