Microbiology, 2021

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156 4 • Prokaryotic Diversity Unfortunately, cyanobacteria can sometimes have a negative impact on human health. Genera such as Microcystis can form harmful cyanobacterial blooms, forming dense mats on bodies of water and producing large quantities of toxins that can harm wildlife and humans. These toxins have been implicated in tumors of the liver and diseases of the nervous system in animals and humans. 20 Table 4.8 summarizes the characteristics of important phototrophic bacteria. Phototrophic Bacteria Phylum Class Example Genus or Species Common Name Oxygenic or Anoxygenic Sulfur Deposition Cyanobacteria Cyanophyceae Microcystis aeruginosa Blue-green bacteria Oxygenic None Chlorobi Chlorobia Chlorobium Green sulfur bacteria Anoxygenic Outside the cell Chloroflexi (Division) Chloroflexi Chloroflexus Green nonsulfur bacteria Anoxygenic None Alphaproteobacteria Rhodospirillum Purple nonsulfur bacteria Anoxygenic None Proteobacteria Betaproteobacteria Rhodocyclus Purple nonsulfur bacteria Anoxygenic None Gammaproteobacteria Chromatium Purple sulfur bacteria Anoxygenic Inside the cell Table 4.8 CHECK YOUR UNDERSTANDING • What characteristic makes phototrophic bacteria different from other prokaryotes? 4.4 Gram-Positive Bacteria Learning Objectives By the end of this section, you will be able to: • Describe the unique features of each category of high G+C and low G+C gram-positive bacteria • Identify similarities and differences between high G+C and low G+C bacterial groups • Give an example of a bacterium of high G+C and low G+C group commonly associated with each category Prokaryotes are identified as gram-positive if they have a multiple layer matrix of peptidoglycan forming the cell wall. Crystal violet, the primary stain of the Gram stain procedure, is readily retained and stabilized within Macrophages and Splenocytes.” Biochimica et Biophysica Acta 1830 no. 4 (2013):2981–2988. 20 I. Stewart et al. Cyanobacterial Poisoning in Livestock, Wild Mammals and Birds – an Overview. Advances in Experimental Medicine and Biology 619 (2008):613–637. Access for free at openstax.org.
4.4 • Gram-Positive Bacteria 157 this matrix, causing gram-positive prokaryotes to appear purple under a brightfield microscope after Gram staining. For many years, the retention of Gram stain was one of the main criteria used to classify prokaryotes, even though some prokaryotes did not readily stain with either the primary or secondary stains used in the Gram stain procedure. Advances in nucleic acid biochemistry have revealed additional characteristics that can be used to classify gram-positive prokaryotes, namely the guanine to cytosine ratios (G+C) in DNA and the composition of 16S rRNA subunits. Microbiologists currently recognize two distinct groups of gram-positive, or weakly staining gram-positive, prokaryotes. The class Actinobacteria comprises the high G+C gram-positive bacteria, which have more than 50% guanine and cytosine nucleotides in their DNA. The class Bacilli comprises low G+C gram-positive bacteria, which have less than 50% of guanine and cytosine nucleotides in their DNA. Actinobacteria: High G+C Gram-Positive Bacteria The name Actinobacteria comes from the Greek words for rays and small rod, but Actinobacteria are very diverse. Their microscopic appearance can range from thin filamentous branching rods to coccobacilli. Some Actinobacteria are very large and complex, whereas others are among the smallest independently living organisms. Most Actinobacteria live in the soil, but some are aquatic. The vast majority are aerobic. One distinctive feature of this group is the presence of several different peptidoglycans in the cell wall. The genus Actinomyces is a much studied representative of Actinobacteria. Actinomyces spp. play an important role in soil ecology, and some species are human pathogens. A number of Actinomyces spp. inhabit the human mouth and are opportunistic pathogens, causing infectious diseases like periodontitis (inflammation of the gums) and oral abscesses. The species A. israelii is an anaerobe notorious for causing endocarditis (inflammation of the inner lining of the heart) (Figure 4.18). Figure 4.18 (a) Actinomyces israelii (false-color scanning electron micrograph [SEM]) has a branched structure. (b) Corynebacterium diphtheria causes the deadly disease diphtheria. Note the distinctive palisades. (c) The gram-variable bacterium Gardnerella vaginalis causes bacterial vaginosis in women. This micrograph shows a Pap smear from a woman with vaginosis. (credit a: modification of work by “GrahamColm”/Wikimedia Commons; credit b: modification of work by Centers for Disease Control and Prevention; credit c: modification of work by Mwakigonja AR, Torres LM, Mwakyoma HA, Kaaya EE) The genus Mycobacterium is represented by bacilli covered with a mycolic acid coat. This waxy coat protects the bacteria from some antibiotics, prevents them from drying out, and blocks penetration by Gram stain reagents (see Staining Microscopic Specimens). Because of this, a special acid-fast staining procedure is used to visualize these bacteria. The genus Mycobacterium is an important cause of a diverse group of infectious diseases. M. tuberculosis is the causative agent of tuberculosis, a disease that primarily impacts the lungs but can infect other parts of the body as well. It has been estimated that one-third of the world’s population has been infected with M. tuberculosis and millions of new infections occur each year. Treatment of M. tuberculosis is challenging and requires patients to take a combination of drugs for an extended time. Complicating treatment even further is the development and spread of multidrug-resistant strains of this pathogen. Another pathogenic species, M. leprae, is the cause of Hansen’s disease (leprosy), a chronic disease that impacts peripheral nerves and the integrity of the skin and mucosal surface of the respiratory tract. Loss of
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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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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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6.1 • Viruses 227 LINK TO LEARNIN
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6.2 • The Viral Life Cycle 229 on
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6.2 • The Viral Life Cycle 231 Fi
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6.2 • The Viral Life Cycle 237 by
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6.2 • The Viral Life Cycle 239 Ca
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6.3 • Isolation, Culture, and Ide
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6.4 • Viroids, Virusoids, and Pri
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6.4 • Viroids, Virusoids, and Pri
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6 • Summary 253 SUMMARY 6.1 Virus
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6 • Review Questions 255 18. A/an
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CHAPTER 7 Microbial Biochemistry Fi
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7.1 • Organic Molecules 259 Figur
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7.1 • Organic Molecules 261 Figur
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7.2 • Carbohydrates 263 and the m
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7.2 • Carbohydrates 265 Figure 7.
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7.3 • Lipids 267 Figure 7.11 Star
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7.3 • Lipids 269 Figure 7.13 This
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7.3 • Lipids 271 Figure 7.15 Five
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7.4 • Proteins 273 Figure 7.17 Am
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7.4 • Proteins 275 Figure 7.19 Re
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7.4 • Proteins 277 Figure 7.23 Pr
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7.5 • Using Biochemistry to Ident
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7.5 • Using Biochemistry to Ident
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7 • Review Questions 283 as hormo
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7 • Review Questions 285 19. A tr
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CHAPTER 8 Microbial Metabolism Figu
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8.1 • Energy, Matter, and Enzymes
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8.2 • Catabolism of Carbohydrates
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8.3 • Cellular Respiration 301 8.
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8.3 • Cellular Respiration 303 Fi
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8.4 • Fermentation 305 If respira
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8.4 • Fermentation 307 Common Fer
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8.5 • Catabolism of Lipids and Pr
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8.6 • Photosynthesis 311 independ
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8.6 • Photosynthesis 313 Oxygenic
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8.7 • Biogeochemical Cycles 315 L
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8.7 • Biogeochemical Cycles 317 N
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8.7 • Biogeochemical Cycles 319 F
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8.7 • Biogeochemical Cycles 321 F
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8 • Summary 323 oxygen as the fin
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8 • Review Questions 325 4. To wh
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8 • Review Questions 327 Matching
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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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17.5 • 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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21.4 • 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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