Euryarchaeota : Haloarchaea Flashcards
diversity of euryarchaeota
methanogens, halophiles, thermophiles, hyperthermophiles
levels of NaCl required by extreme halophiles
1.5 M
2-4 M
5.5 M
examples of archaea that grows at lower salinities
haloferax
natronobacterium
differentiate salt lakes and soda lakes
salt lake - sodium, chloride, sulfate; slightly alkaline
soda lakes - trace amounts of calcium, magnesium ; highly alkaline
what type of organism aisde from archaea lives in salt lakes
Dunaleila - alga, oxygenic phototrophs
organism present in soda lake bacteria
Ectothiorhodospira
halorhodospira
having enclosed basins with solar sea salt
marine salterns
massive growth turns reddish purple color due to massive growth
bloom
morphology of archaea present in salterns
cup or square shape
taxonomic groups within haloarchaea
halobacteriales
natrialbales
haloferacales
they grow in soda lakes at pH of 9-11
natrosomonas, natronobacterium
morphology of halobacteria
gram -
binary fission
non sporing
this bacteria can form gas vesicles
haloquadratum
these two bacteria have very large plasmids
halobacterium
halococcus
what electron donors are used by haloarchaea in aerobic conditon
amino and organic acid
how etc occurs for halobacterium
- electron motive force
- cyt a, b, and c
explain the osmotic balance achieved among halophiles
- they pump K ions from the environment to their cytoplasm
explain the cell wall components of halobacterium
- Na ions stabilize the negative charge of the carboxyl groups of the aspartate and glutamate
- they will lyse with low NA levels due to repulsion
cytoplasmic requirements of H. salinarum
- K ions for balance
- ribosomes require it as well
light sensitive pigments in H. salinarum
- bacterioruberins
a protein produced as adaptation to low air levels
bacteriorhodopsin
this protein absorbs what spectrum of light
green 570 nm
another loght driven AtP sysntheis but ises cl as well
halorhodopsin
aids in the chemotaxis for halorhodopsin
sensory rhodopsin
