First lecture and second lecture : 22/4/2015 and 24/4/2015

Dr. Wan, for the last week lesson I will combine them into one post.

Topic: Bacteria

Notes:

1) We can use different traits to classify bacteria: cell type, morphology, metabolism, reproduction, phage typing, nucleic acid profile and antibiotic resistance profile.

2) Prokaryotes are divided into 4 category. 

 a) Category 1: Gram -ve bacteria with cell wall

Gram -ve bacteria have thin layer of peptidoglycan in between cytoplasmic membrane and outer membrane of cell wall.

 

3) Gram -ve bacteria with cell walls can be divided into 2 groups based on reproduction and light. One of the groups is nonphototrophic. Nonphototrophic bacteria contain 14 subgroups and 6 of the subgroups are pathogens.

a) Enteric groups

- facultative anaerobic short rods

- E.coli O157:H7 causing uninary tract infection 

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b) Campylobacter and Helicobacter

- Aerobic, microaerophilic

- motile

- helical/vibriod bacteria

- Campylobacter jejuni causing diarrhea

- Helicobacter pylori causing ulcer

c) Spirochetes

- slender and long with flexible and helical shape

- corkscrew movement

- They have endoflagella that coil around the cell for cork screw movement.

- causing syphilis and lyme disease

d) Chlamydias

- Obligately intracellular parasites

- resemble virus- intracellular parasites and size

- they are different from virus because they have both DNA and RNA, plasma membrane, metabolic pathways, reproduction by binary fission.

- causing eye/genitourinary tract infection.

e) Pseudomonas, Azobacter and Rhibozium

- nonpathogenic

- Pseudomonas sp. degrade complec organic molecule in soil

- Azobacter and Rhibozium do nitrogen fixation in soil

Activity: Do mind map using padlet and each group need to present one of the kingdom in front of the class.

My own Explorace:

1) Facultative anaerobe is an microorganism that makes ATP by aaerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent.

2) Microaerophile is a microorganism that requires oxygen to survive, but requires environments containing lower levels of oxygen that are present in atmosphere. 

3) Treponema pallidum cause syphilis and Borrelia burgdorferi cause lyme disease. Lyme disease is transmitted to humans by the bite of infected ticks of the Ixodes genus.

4) Chlamydia trachomatis cause eye infection. Chlamydia infections are the most common bacterial sexually transmitted diseases in humans and are the leading cause of infections blindness worldwide.

Reflection:

E-port folio again. I thaught I will never touch this blog anymore. My feeling to this blog is complicated. It took over few hours of my happy weekend to complete e-port folio. But, I admit I can revised again what Dr taught and take initiative to look for the things that I don't understand. There are few things that we have learnt in semester 1 but I already forgot. For example, I have forgot the name of bacteria that caused syphilis. Dr.Wan introduced new apps, pedlet to us in class.  Although Dr have mentioned pedlet before, but this is my first time to use it. I think it is very convenient for group mindmap.