Microbiology: A Systems Approach
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1 Microbiology: A Systems Approach First Edition Cowan &Talaro Chapter 5
2 Eucaryotic cells and microorganisms Chapter 5 2
3 3 Eucaryotic cells 3
4 Flagella 4
5 Cilia similar in overall structure to flagella, but shorter and more numerous found only on a single group of protozoa and certain animal cells function in motility, feeding & filtering 5
6 Glycocalyx structure 6
7 Cell wall rigid & provide structural support & shape fungi have thick inner layer of polysaccharide fibers composed of chitin or cellulose & a thin layer of mixed glycans Algae varies in chemical composition; substances commonly found include cellulose, pectin, mannans, silicon dioxide, & calcium carbonate 7
8 Cell membrane typical bilayer of phospholipids and proteins sterols confer stability serve as selectively permeable barriers in transport eucaryotic cells also contain membranebound organelles that account for 60 80% of their volume 8
9 nucleus compact sphere, most prominent organelle of eucaryotic cell nuclear envelope is composed of two parallel membranes separated by a narrow space & is perforated with pores contains chromosomes nucleolus dark area for rrna synthesis & ribosome assembly 9
10 nucleus 10
11 Endoplasmic reticulum Rough endoplasmic reticulum (RER) originates from the outer membrane of the nuclear envelop & extends in a continuous network through cytoplasm; rough due to ribosomes, proteins are synthesized & shunted into the ER for packaging & transport. First step in secretory pathway. Smooth endoplasmic reticulum (SER) closed tubular network without ribosomes, functions in nutrient processing, synthesis & storage of lipids, etc. 11
12 rough endoplasmic reticulum (RER) 12
13 Golgi apparatus consists of a stack of flattened sacs called cisternae closely associated with ER Transistional vesicles from the ER containing proteins go to the Golgi apparatus for modification and maturation Condensing vesicles transport proteins to organelles or secretory proteins to the outside 13
14 Golgi apparatus 14
15 Transport process 15
16 lysosomes vesicles containing enzymes involved in intracellular digestion of food particles & in protection against invading microbes 16
17 lysosomes 17
18 mitochondria consists of an outer membrane & an inner membrane with folds called cristae cristae hold the enzymes & electron carriers of aerobic respiration divide independently of cell contain DNA and procaryotic ribosomes function in energy production 18
19 mitochondria 19
20 chloroplast found in algae & plant cells outer membrane covers inner membrane folded into sacs, thylakoids, stacked into grana larger than mitochondria contain photosynthetic pigments convert the energy of sunlight into chemical energy through photosynthesis primary producers of organic nutrients for other organisms 20
21 chloroplast 21
22 22
23 cytoskeleton 23
24 ribosomes composed of rrna and proteins 40S and 60S subunits form 80S ribosomes larger than procaryotic ribosomes function in protein synthesis 24
25 Survey of eucaryotic microbes Fungi Algae Protozoa Parasitic helminths 25
26 Kingdom Fungi 100,000 species divided into 2 groups: macroscopic fungi ( mushrooms, puffballs, gill fungi) microscopic fungi (molds, yeasts) majority are unicellular or colonial, a few have cellular specialization 26
27 microscopic fungi exist in 2 morphologies yeast round ovoid shape, asexual reproduction hyphae long filamentous fungi or molds some exist in either form dimorphic characteristic of pathogens 27
28 Morphology of yeasts 28
29 Hyphae or mold 29
30 Fungal nutrition all are heterotrophic majority are harmless saprobes living off dead plants & animals some are parasites, living on the tissues of other organisms, but none are obligate; mycoses fungal infections growth temperature 20 o 40 o C extremely widespread distribution in many habitats 30
31 Fungal Reproduction primarily through spores formed on special reproductive hyphae asexual reproduction spores are formed through budding or in conidia or sporangiospores sexual reproduction spores are formed following fusion of male & female strains & formation of sexual structure sexual spores are one basis for classification 31
32 Asexual mold spores 32
33 I. Zygospores 33
34 II. Ascospores 34
35 III. Basidospores 35
36 Roles of fungi decomposers of dead plants and animals sources of antibiotics used in making foods & in genetic studies adverse impact food spoilage, mycoses, toxin production 36
37 Kingdom Protista algae protozoa 37
38 Protozoa 65,000 species most are unicellular, colonies are rare most have locomoter structures flagella, cilia, or pseudopods vary in shape lack a cell wall & chloroplasts can exist in trophozoite motile feeding stage or cyst a dormant resistant stage 38
39 Protozoa 39
40 Protozoa all are heterotrophic, most are free living in a moist habitat feed by engulfing other microbes & organic matter some are animal parasites & can be spread by insect vectors asexual and sexual reproduction 40
41 Groups based on locomotion & reproduction Mastigophora flagellates Sarcodina amebas Ciliophora ciliates 41
42 Mastigophora flagellates 42
43 Sarcodina amebas 43
44 Ciliophora ciliates 44
45 Parasitic Helminths multicellular animals, organs for reproduction, digestion, movement, protection parasitize host tissues have mouthparts for attachment to or digestion of host tissues most have well developed sex organs that produce eggs and sperm. fertilized eggs go through larval period in or out of host body 45
46 Major groups of helminths 1. flatworms flat, no definite body cavity; digestive tract a blind pouch; simple excretory & nervous systems cestodes (tapeworms) trematodes or flukes, are flattened, nonsegmented worms with sucking mouthparts 2. roundworms (nematodes) round, a complete digestive tract, a protective surface cuticle, spines & hooks on mouth; excretory & nervous systems poorly developed 46
47 Helminths 50 species parasitize humans acquired though ingestion of larvae or eggs in food; from soil or water; some are carried by insect vectors afflict billions of humans 47
48 48
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