Hi
guys! Last week, before I went to Terengganu for my BAKSIS project, I
learn about Archaea and Bacteria. Thanks to Malik's group for the
nice presentation about archaea! :)
Archaea
can be classified into 2 phylum which are Euryarchaeota and
Crenarchaeota but recently scientist found that there is an
additional phyla which is Thaumarchaeota. Unique features of archaea
include :
- Cell wall
- Membrane lipids
- Metabolism
- Genetics
Phyla
Euryarchaeota
Dominant
group : Methanogens
It
is the largest group of archaea. We can find them in anoxic
environment rich in organic matters such as :
- Deep soil
- Intestinal tract
- Marine sediment
- Sewage treatment facilities
Methanogens
can produce methane which can generate energy for heat and
electricity. BUT, methane can absorbs infrared radiation thus causing
global warming!!
Dominant
group : Halophiles
Halobacteria
that usually aerobic and their habitat are salt lakes and salted
fish. The example of halobacteria is Halobacterium
salinarium. They
can carry out photosysthesis without chlorophyll or
bacteriochlorophylls.
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Great Salt Lake, Utah |
Phyla
Crenarchaeota
Most
of them are thermophiles, hypothermophiles, extremely thermophilic,
acidophiles and sulfur dependent. They are strictly anaerobes. There
are 2 representative genera :
- Geogemma
- Pyrodictium
Lastly,
we look for a journal regarding the SCL questions and share with
other coursemate. That's all for today. Bye! :)