VIRUS IN YOUR NOSE Look out youre surrounded Bacteria and viruses are all around us Examples Bacteria Used in Food Making Bacteria used in Digestion E coli Some bacteria cause disease pathogenic ID: 799610
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Slide1
BACTERIA ON YOUR CLOTHES…VIRUS IN YOUR NOSE
Slide2Look out, you’re surrounded! Bacteria and viruses are all around us….Examples:Bacteria Used in Food MakingBacteria used in Digestion (E. coli)Some bacteria cause disease (pathogenic)ALL viruses cause disease (all pathogenic)BACTERIA & VIRUSES
Slide3BacteriaStructure
Slide4LIVING, microscopic and lacking internal membranesProkaryotic
Slide5Bacteria cells are usually much smaller than plant and animal cells and do not contain as many internal structures.
Slide6Slide7Bacteria cells contain cytoplasm surrounded by a cell membrane and a cell wall.Its hereditary material is found in the cytoplasm.
Slide8Some bacteria have a thick, gel-like capsule around the cell wall to protect it.
Slide9Bacteria in moist environments have whiplike tails called flagella that help them move.
Slide10Let's reviewwhat we knowabout bacteria.
Slide11ArchaebacteriaandEubacteria
Slide12Bacteria that live in harsh environments (extremophiles) where few kinds of other organisms can live: * methanogens: * thermophiles: * halophilesArchaebacteria
Slide13The larger of the two groups of bacteria. These usually live in less harsh environments. Eubacteria
Slide14Most bacteria are beneficial.All bacteria that cause known diseases are eubacteria.
Slide15Bacteria can be classified according to:ShapeCell WallsMovement
Metabolic diversity
(the way they obtain energy)
Slide16There arethree majorshapes of bacteria.
Slide17Slide18Sphere-shaped bacteria (cocci)
sometimes grow in chains or in clumps like a
bunch of grapes.
Streptococcus
(strep throat)
Staphylococci
(responsible for "staph" infections and gangrene)
Cocci
Slide19Rod-shaped bacteria (bacilli) can also form in chains. Some types of these bacteria also have whiplike structures called flagella to help them move around.
Escherichia coli
or
E.coli
(found in the intestines of mammals)
Salmonella typhi
(causes typhoid fever and
food poisoning)
Bacilli
Slide20Spiral-shaped bacteria (spirilla)
can use their shape to propel themselves by twisting like a corkscrew.
Treponema pallidumcholera
(syphilis)
Borrelia burgdorferi
(Lyme disease)
Spirilla
Slide21Bacteria areoften foundin groupsor colonies.
Slide22BacterialColony Types
Slide23Monococcus - a
single
spherical
bacterium, living alone
Diplococcus -
two
spherical
bacteria, living in a pair
Streptococcus:
chains
of nearly
spherical
bacteria.
Streptobacillus:
chains
of
rod
-shaped bacteria.Staphylococcus : spherical bacterium occurring in grape-like clusters.Staphylobacillus - a cluster of rod shaped bacteria
Slide24Slide25Streptococcus
Streptococcus:
chains
of nearly spherical bacteria.
Slide26Streptobacillus
Streptobacillus:
chains
of rod-shaped bacteria.
Slide27Staphylococcus :
spherical
bacterium occurring in grape-like clusters.
Staphlococcus
Slide28Other waysto classifyand identifybacteria...
Slide29Some cell walls change colors when stained and other cell walls do not. The bacteria that have the stained cell walls are called Gram positive (have much peptidoglycan in cell walls). The bacteria with cell walls that do not stain are called Gram negative (no peptidoglycan). Doctors regularly use gram staining to select the proper antibiotic to treat bacterial infections.
Gram stain
Slide30How dobacteriareproduce?
Slide31Bacteria reproduce by means of binary fission, in which a copy of the DNA is made and then the outer membrane of the bacterium begins to grow inward and divides into two identical cells. Also, to exchange genetic material one bacterium attaches itself to another bacterium and introduces DNA directly into it by means of a pilus through the process of conjugation.
Slide32*SmartNotebook video
Slide33Some bacteria are able to produce thick walls around themselves when evironmental conditions are unfavorable. They form an endospore and can become dormant for hundreds of years.
Slide34Conjugation
Slide35Bacteria dividing
Slide36bacteria require oxygen to survivebacteria can live with or without oxygenbacteria use other organisms for energy bacteria produce their own food through photosynthesisAnaerobicAerobic
Heterotrophic
Autotrophic
Slide37Slide38Bacteriaand yourHealth
Slide39Bacteria doesn’t just make you sick, it can also keep you healthy. You cannot survive without some bacteria living in or on your body.(Ex: E. coli in digestive tract)
Slide40Some bacteria produce chemicals called antibiotics that limit the growth of other bacteria. Overuse of antibiotics has led to more resistant bacteria.
Slide41Bacteria that cause disease are called pathogens.A vaccine is made from a deadened or weakenend version of a virus or bacterium. Immunization with certain vaccines can prevent other bacterial diseases.Pathogen
Slide42Many pathogens produce poisons called toxins as they grow in your body or as they grow in food that you might eat.Toxins
Slide43Botulism is a type of food poisoning that is the result of a toxin produced by bacteria whose endospores can survive in canned food.
Slide44Bacteriaand Industry
Slide45Cheeses, buttermilk, chocolate, vinegar, sauerkrautFood madewith bacteria
Slide46Pasteurization is a process that is used to kill most harmful bacteria and lengthen the time foods can be stored without spoiling.
Slide47Courtesy of:
Quiz time!
Slide48At any given time you have about a billion bacteria on every tooth in your mouth.
Slide49True.
Warm and moist, your mouth is a breeding ground for bacteria. Some of these bacteria feed on bits of food trapped between the teeth. Immediately after brushing you still have up to a hundred thousand bacteria living on each tooth!
Photograph by David Scharf/Peter Arnold Inc.
Slide50Swamps produce terrible odors because owls shower them with nasty-smelling antibacterial sprays.
Slide51False.
Swampy areas are filled with wet, rotting vegetation. Plants rot as bacteria feed on them. In the process of feeding in these watery areas where there is very little air, bacteria known as
methanogens
produce a number of gases—including methane and sulfides, which smell like rotten eggs.
Art by Scott Angle
Slide52There are millions of species of bacteria that can make people ill.
Slide53False.
Of the thousands of species of bacteria, only a handful make people ill. The rod-shaped bacteria above cause bubonic plague, a disease that is carried by rodents and fleas. Bubonic plague kills about 1,500 people a year worldwide. This bacteria tends to get more attention than the more common “good” bacteria.
Photograph by CNRI/Science Photo Library/Photo Researchers, Inc.
Slide54People use bacteria to clean up after oil spills.
Slide55True.
Scientists have discovered that several kinds of bacteria can live on a diet of oil. Now if an oil pipe leaks, spilling its contents on the ground, cleanup crews know how to deal with the mess. They cart in bacteria-rich soil and pile it onto the contaminated site. Then they sit back and let the bacteria eat the oil up!
Art by Scott Angle
Slide56Bacteria don’t often reproduce.
Slide57False.
Bacteria reproduce by dividing, some “lickety-splitting” in half once every 12 to 20 minutes. At that rate, one bacterium can produce billions of offspring in a day.
Photograph by Manfred Kage / Peter Arnold, Inc.
Slide58Slide59Let's make
BACTERIA!
Slide60Viral Structure
Slide61Is a Virus Alive?
Viruses do NOT have all the characteristics of life (no cells/no machinery for protein synthesis) and are therefore not considered to be alive.
Slide62Viral Structure
ALL Viruses consist of: segments of a nucleic acid (
DNA or RNA
) contained in a protein coat (
capsid
).
Slide63Structure of Adenovirus
Causes Respiratory Diseases
Polyhedral Shape
,
Slide64Some viruses have an envelope surrounding the capsid.Outside the envelope glycoproteins
are attached.
Glycoproteins on the virus attach to receptors on the cell surface.
When this happens, the cell allows the virus to enter.
Envelope
Glycoproteins
Slide65Structures of TMV and Influenza Virus
Causes Tobacco Mosaic Virus and the Flu
Rod shaped
Slide66Structure of BacteriophageA bacteriophage is a virus that infects a bacteria.
Slide67Bacteriophage Attacking Cell
Slide68Structure of HIVCauses AIDS
Slide69How do viruses reproduce?
Slide70Viral Reproduction
Viruses lack enzymes and structures to make proteins (no ribosomes).
Therefore viruses, depend on living cells to replicate and use the energy of the host cell to carry out reproductive processes.
They enter a cell by:
injecting their genetic material into the cell
slipping through tears in a plant cell wall
binding to molecules on the cell surface and triggering endocytosis (cell engulfment)
Slide712 Viral Pathways
Slide72Slide73Slide74http://www.npr.org/templates/story/story.php?storyId=114075029&sc=nl&cc=es-20091129
Follow the link below to view an animation of a virus infecting human cells:
Slide75A glycoprotein on HIV attaches to the CD4 receptor on a cell.
2) A second HIV glycoprotein attaches to the CCR5 receptor on the cell.
HIV Infection
HIV infects cells called
macrophages
in your body!
Slide763)The cell then allows the viral capsid to enter the cell and the viral RNA is released into the cell.4)The viral RNA is converted to viral DNA using an enzyme known as reverse transcriptase.
Slide775) The viral DNA integrates into the host cell DNA.6) The viral DNA will use the host cell’s ribosomes to make more copies of the virus.7) The new viruses are released from the host cell by budding.
8) Newly released viruses infect more cells.
Slide78After a period of time, the HIV viruses will mutate and begin to infect T-cells. T-cells die once infected with HIV.
T-cells are a major component of the body’s immune system.
The disease AIDS forms as the immune system becomes weakened as T-cells are being destructed.
Slide79Virus is Latin for "poison"ALL viruses are PATHOGENIC!
Do you know what this means?