Microbiology, 2021

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584 14 • Antimicrobial Drugs Figure 14.15 Microscopic examination of an induced sputum sample or bronchoaveolar lavage sample typically reveals the organism, as shown here. (credit: modification of work by the Centers for Disease Control and Prevention) Antiprotozoan Drugs There are a few mechanisms by which antiprotozoan drugs target infectious protozoans (Table 14.9). Some are antimetabolites, such as atovaquone, proguanil, and artemisinins. Atovaquone, in addition to being antifungal, blocks electron transport in protozoans and is used for the treatment of protozoan infections including malaria, babesiosis, and toxoplasmosis. Proguanil is another synthetic antimetabolite that is processed in parasitic cells into its active form, which inhibits protozoan folic acid synthesis. It is often used in combination with atovaquone, and the combination is marketed as Malarone for both malaria treatment and prevention. Artemisinin, a plant-derived antifungal first discovered by Chinese scientists in the 1970s, is quite effective against malaria. Semisynthetic derivatives of artemisinin are more water soluble than the natural version, which makes them more bioavailable. Although the exact mechanism of action is unclear, artemisinins appear to act as prodrugs that are metabolized by target cells to produce reactive oxygen species (ROS) that damage target cells. Due to the rise in resistance to antimalarial drugs, artemisinins are also commonly used in combination with other antimalarial compounds in artemisinin-based combination therapy (ACT). Several antimetabolites are used for the treatment of toxoplasmosis caused by the parasite Toxoplasma gondii. The synthetic sulfa drug sulfadiazine competitively inhibits an enzyme in folic acid production in parasites and can be used to treat malaria and toxoplasmosis. Pyrimethamine is a synthetic drug that inhibits a different enzyme in the folic acid production pathway and is often used in combination with sulfadoxine (another sulfa drug) for the treatment of malaria or in combination with sulfadiazine for the treatment of toxoplasmosis. Side effects of pyrimethamine include decreased bone marrow activity that may cause increased bruising and low red blood cell counts. When toxicity is a concern, spiramycin, a macrolide protein synthesis inhibitor, is typically administered for the treatment of toxoplasmosis. Two classes of antiprotozoan drugs interfere with nucleic acid synthesis: nitroimidazoles and quinolines. Nitroimidazoles, including semisynthetic metronidazole, which was discussed previously as an antibacterial drug, and synthetic tinidazole, are useful in combating a wide variety of protozoan pathogens, such as Giardia lamblia, Entamoeba histolytica, and Trichomonas vaginalis. Upon introduction into these cells in low-oxygen environments, nitroimidazoles become activated and introduce DNA strand breakage, interfering with DNA replication in target cells. Unfortunately, metronidazole is associated with carcinogenesis (the development of cancer) in humans. Another type of synthetic antiprotozoan drug that has long been thought to specifically interfere with DNA replication in certain pathogens is pentamidine. It has historically been used for the treatment of African sleeping sickness (caused by the protozoan Trypanosoma brucei) and leishmaniasis (caused by protozoa of the genus Leishmania), but it is also an alternative treatment for the fungus Pneumocystis. Some studies indicate that it specifically binds to the DNA found within kinetoplasts (kDNA; long mitochondrion-like structures Access for free at openstax.org.
14.4 • Mechanisms of Other Antimicrobial Drugs 585 unique to trypanosomes), leading to the cleavage of kDNA. However, nuclear DNA of both the parasite and host remain unaffected. It also appears to bind to tRNA, inhibiting the addition of amino acids to tRNA, thus preventing protein synthesis. Possible side effects of pentamidine use include pancreatic dysfunction and liver damage. The quinolines are a class of synthetic compounds related to quinine, which has a long history of use against malaria. Quinolines are thought to interfere with heme detoxification, which is necessary for the parasite’s effective breakdown of hemoglobin into amino acids inside red blood cells. The synthetic derivatives chloroquine, quinacrine (also called mepacrine), and mefloquine are commonly used as antimalarials, and chloroquine is also used to treat amebiasis typically caused by Entamoeba histolytica. Long-term prophylactic use of chloroquine or mefloquine may result in serious side effects, including hallucinations or cardiac issues. Patients with glucose-6-phosphate dehydrogenase deficiency experience severe anemia when treated with chloroquine. Common Antiprotozoan Drugs Mechanism of Action Drug Class Specific Drugs Clinical Uses Inhibit electron transport in mitochondria Naphthoquinone Atovaquone Malaria, babesiosis, and toxoplasmosis Not applicable Proquanil Combination therapy with atovaquone for malaria treatment and prevention Inhibit folic acid synthesis Sulfonamide Sulfadiazine Malaria and toxoplasmosis Not applicable Pyrimethamine Combination therapy with sulfadoxine (sulfa drug) for malaria Produces damaging reactive oxygen species Not applicable Artemisinin Combination therapy to treat malaria Inhibit DNA synthesis Nitroimidazoles Metronidazole, tinidazole Infections caused by Giardia lamblia, Entamoeba histolytica, and Trichomonas vaginalis Not applicable Pentamidine African sleeping sickness and leishmaniasis Inhibit heme detoxification Quinolines Chloroquine Mepacrine, mefloquine Malaria and infections with E. histolytica Malaria Table 14.8 CHECK YOUR UNDERSTANDING • List two modes of action for antiprotozoan drugs.
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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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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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13.3 • Using Chemicals to Control
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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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20.2 • 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 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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21.3 • Viral Infections of the Sk
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21.4 • Mycoses of the Skin 881 se
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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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22.4 • Respiratory Mycoses 931 ha
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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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