E.coli on small intestines - PowerPoint PPT Presentation

About This Presentation
Title:

E.coli on small intestines

Description:

Helpful Bacteria E.coli on small intestines ... – PowerPoint PPT presentation

Number of Views:99
Avg rating:3.0/5.0
Slides: 24
Provided by: Valued1237
Category:

less

Transcript and Presenter's Notes

Title: E.coli on small intestines


1
                                                                           1

                                                                           1

                                                                           1

                                                                           1

                                                                           1

Helpful Bacteria

E.coli on small intestines
2
Introduction to Bacteria
  • 2 TYPES OF BACTERIA
  • Bacteria
  • -Get food from an outside source
  • Blue-green Bacteria
  • -Make their own food

3
3 Shapes of Bacteria
Bacteria are classified by shape into 3 groups
Spiral spirilla rod-shaped bacilli,
bacillus Round cocci
4
3 Shapes of Bacteria
5
7 Major Structures of a Bacteria Cell
  • Capsule
  • Cell wall
  • Ribosomes
  • Nucleoid
  • Flagella
  • Pilli
  • Cytoplasm

6
7 Major Structures of a Bacteria Cell
Capsule
  • keeps the cell from drying out and helps it
    stick to food or other cells

7
7 Major Structures of a Bacteria Cell
Cell wall
  • Thick outer covering that maintains the overall
    shape of the bacterial cell

8
7 Major Structures of a Bacteria Cell
Ribosomes
  • cell part where proteins are made
  • Ribosomes give the cytoplasm of bacteria a
    granular appearance in electron micrographs

9
7 Major Structures of a Bacteria Cell
Nucleoid
  • a ring made up of DNA

10
7 Major Structures of a Bacteria Cell
Flagella
  • a whip-like tail that some bacteria have for
    locomotion

11
7 Major Structures of a Bacteria Cell
Amimation of E.coli
12
7 Major Structures of a Bacteria Cell
Pilli
  • hollow hair-like structures made of protein
  • allows bacteria to attach to other cells.
  • Pilli-singular
  • Pillus-plural

13
7 Major Structures of a Bacteria Cell
Cytoplasm
  • clear jelly-like material that makes up most of
    the cell

14
Reproduction of Bacteria
  • Binary Fission- the process of one organism
    dividing into two organisms
  • Fission is a type of asexual reproduction
  • Asexual reproduction- reproduction of a living
    thing from only one parent

How?... The one main (circular) chromosome makes
a copy of itself Then it divides into two
15
Reproduction of Bacteria
BINARY FISSION
Completed
Bacteria dividing
16
Reproduction of Bacteria
  • The time of reproduction depends on how desirable
    the conditions are
  • Bacteria can rapidly reproduce themselves in
    warm, dark, and moist conditions
  • Some can reproduce every 20 minutes
  • (one bacteria could be an ancestor to one
    million bacteria in six hours)

17
Bacterial Cell Nucleiod DNA Ring
DNA replication
Cell wall synthesis
Binary Fission
Cell separation
18
Bacteria Survival
  • Endospore-
  • a thick celled structure that forms inside
  • the cell
  • they are the major cause of food poisoning
  • allows the bacteria to survive for many years
  • they can withstand boiling, freezing, and
    extremely dry conditions
  • it encloses all the nuclear materials
  • and some cytoplasm

19
Bacteria Survival
Bacillus subtilis Endospore-the black section in
the middle
  • highly resistant structures
  • can withstand radiation, UV light, and boiling at
    120oC for 15 minutes.

20
Bacteria Survival Food sources
  • parasites bacteria that feed on living things
  • saprophytes use dead materials for food
    (exclusively)
  • decomposers get food from breaking down dead
    matter into simple chemicals
  • important- because they send minerals and other
    materials back into the soil so other organisms
    can use them


21
                                                                           1

                                                                           1

                                                                           1

                                                                           1

                                                                           1

Strep animation http//www.hybridmedicalanimation.
com/pages/jjani_qt/strep_pneumo_qt.html

Ecoli movement animatoin http//www.hybridmedical
animation.com/pages/jjani_qt/ecoli_qt.html
22
Ecoli movement animatoin http//www.hybridmedical
animation.com/pages/jjani_qt/ecoli_qt.html
23
                                                                           1

                                                                           1

                                                                           1

                                                                           1

                                                                           1


HIV movie http//www-micro.msb.le.ac.uk/Video/HIV.
mov
Write a Comment
User Comments (0)
About PowerShow.com