Origins - Three Domain Classification PROKARYOTES
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1 Bacteria
2 Origins - Three Domain Classification EU PROKARYOTES
3 I. Origins of Bacteria Prokaryotes Eubacteria Archaebacteria A. Prokaryotes = 1. Kingdom Eubacteria 2. Kingdom Archaebacteria 3. Prokaryote = does not have a nucleus
4 I. Origins B. 3.5 billion years ago C. FIRST LIFE FORMS were: Archaebacteria, or ancient bacteria (how do we know this?) early Earth atmosphere had almost no O 2 D. Eubacteria is true bacteria (Eu = true) Eukaryote = true nucleus
5 II. Archaebacteria A. General Info. 1. EXTREME! Primitive bacteria 2. Live in extreme or harsh environments B. Three kinds of Archaebacteria:
6 1. Halophiles = live in very basic or salty environments E.g. Great Salt lake, Dead Sea
7 2. Methanogens Anaerobic (don t need O 2 ) Make methane gas (CH 4 ) Swamp
8 3. Thermophiles live in hot or acidic environments (~ph 1-4) Near undersea volcanic vents Sulphur Springs Hot springs in Yellowstone National Park
9 III. Eubacteria A. General 1. Ubiquitous = they exist everywhere, most of the bacti.. we know 2. Harmful pathogenic (they cause disease) 3. Helpful they have a variety of uses
10
11 4. Odd means of getting nutrients Chemo autotrophic ( eat chemicals) Some eat NH 3 (ammonia) Some eat H 2 S (hydrogen sulfide)» Sulfide-eating bacteria
12 Helpful Bacteria 1. Food & Drink Production Fermentation (drinks) Wine, beer Dairy products Cheese, sour cream, yogurt, sourdough, Other -Pickles, vinegar, sauerkraut
13 Helpful Bacteria 2. Sewage Decomposition Bacteria break down the organic matter
14 3. Water Treatment Helpful Bacteria
15 Helpful Bacteria Where is most of the Nitrogen found on planet Earth? In the atmosphere Where do plants need it to be? In the soil 4. Nitrogen Fixation in roots Helps plants take up H 2 O and nutrients from soil
16 Helpful Bacteria 5. Bio-mineralization in Mining Bacteria concentrate desired elements from ore E.g. Au (gold) Ralstonia metallidurans, is capable of precipitating dissolved gold. Cu (copper)
17 Helpful Bacteria 6. Bioremediation Microbes can help repair damaged ecosystems Pseudomonas, a common type of oil eating bacteria, is used around the world to help clean up oil spills.
18 Helpful Bacteria 7. Human Recreation = Artificial Snow- Making Bacteria allow H 2 O to form ice crystals
19 Bacterial Classification 1. Shape and Groupings 2. Cell wall composition 3. Environment 4. DNA Sequences
20 Bacterial Cell
21 Cell Wall Bacterial Structure Prevents cell from rupturing Composition of cell wall helps to identify bacteria
22 Bacterial Structure Cell Membrane F(x) ) = support & protect Differentially permeable Cytoplasm Contains organelles (non-membranous)
23 Bacterial Structure Genetic Material Single, circular chromosome Plasmid = extra chromosome that can replicate separately from the main chromosome Use as vector for biological engineering Can pass genes for antibiotic resistance to other bacteria (sometimes resistance to several one time)
24 Bacterial Structure Ribosomes F(x) ) is to synthesize proteins
25 Bacterial Structure Capsule (Slime Layer) viscous coating outside of bacteria cell wall F(x)s: Protection bacteria s pathogenicity (or ability to cause disease) Protects bacteria from the Immune System (WBC s)
26 Bacterial Structure Other structures (Appendages) Flagella (protein appendage) F(x) ) = locomotion Cell can have one, two, or many Pili (hair-like extensions) F(x)s = attachment to host and transfer of genetic material Fimbriae (shorter than pili) F(x) ) = adhesion to surfaces
27 Flagella
28 Bacterial Shapes A. Typical 1. Coccus/Cocci = spherical or round 2. Bacillus/Bacilli = rod-shaped 3. Spirillum/Spirilli = spiral-shaped shaped
29 Bacterial Shapes
30 Bacterial Groupings Groups determined by the plane in which the cell divides
31 Bacterial Groupings 1 plane = diplo- (pair) strepto- (chain) 2 planes = tetrad (packet of 4) Several random = staphylo- (grape-like clusters)
32 Identify shapes & groupings
33 Bacterial Shapes B. Atypical 1. Pleomorphic Variable in shape and size Eg. Stella (stars) Eg. Arcula (cubes) 2. Mycoplasmas Lack rigid cell walls Can change shape
34 GRAM STAINING History & Definitions Developed by Hans Christian Gram in 1884 Helps to identify different types of bacteria (a differential stain) Stain uses differences in cell wall composition to differentiate between bacteria Can help determine which type of antibiotics will be most effective against a particular bacteria
35 Gram Positive Cells Stain purple Has thick peptidoglycan layer More susceptible to Penicillin
36 Thick layer of peptidoglycan
37 Gram Positive POSITIVELY PURPLE!!!
38 Gram Negative
39 Thin layer of peptidoglycan
40 Gram Negative Stain pink/light red A thin layer of peptidoglycan (space) Less susceptible to Penicillin than gram positive
41 Penicillin (a fungus) Antibiotic inhibits synthesis of peptidoglycan; used on actively growing organisms. Gram (+) cells Penicillin works Gram (-)( ) cells Pencillin doesn t t work so well
42 Overview of Staining Why do we stain? To better view a cell s structure.
43 Gram Staining Procedure Steps (abbreviated): 1) Add primary (1 o ) stain Crystal Violet 2) Add mordant to cells Iodine 3) Add decolorizer to cells Alcohol 4) Add secondary (2 o ) stain - Safranin
44 Gram Staining Steps
45 Bibliography Thanks to Jordan Sonneberg for the start of this ppt! Yellowstone sciences.unlv.edu/.../pages/episode2.htm Retrieved 11/12/08 Yellowstone serc.carleton.edu/microbelife/research_methods/ 11/212/08 Swamp Protegeu Retrieved 11/12/08 Image of ribosomes sciences.unlv.edu/.../pages/episode2.htm Retrieved 11/27/07 Image of Bacterial cell wall pbdb.itan.kyoto-u.ac.jp/saikin-e.html Retrieved 11/27/07 Map of Great Salt Lake ut.water.usgs.gov/greatsaltlake/index.html Retrieved 11/27/07 Image of Dead Sea Retrieved 11/27/07 Pickles Retrieved 11/12/08 Yogurt Retrieved 11/12/08 Sewage treatment plant Retrieved 11/12/08 Water Treatment Retrieved 11/12/08 Sauerkraut Retrieved 11/12/08 Nitrogen-fixing bacteria Retrieved 11/12/08 Biomineralization of gold Retrieved 11/12/08 Bioremediation Retrieved 11/13/08 Oil-eating Bacteria Retrieved 11/13/08 Bacterial shapes retrieved 11/13/08
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