L19: Stratification Flashcards
Where did O2 come from if world was anoxic, caviat
*cyanobacterial oxygenic photosynthesis
*not all phototrophy is oxygen + O2 only accumulated after reduced reactive compounds were oxidised (Fe)
Draw nitrate, chloroa, light, nitrate and turbulence as depth increases, why, caviats
draw
the deeper you go the more nitrate but less light so cells need more chlorophyll
most chloroA where light / nitrate gradient meet
What is prochlorooccus marinus
*smallest oceanic cyanobacteria anfd most abudnat cell type on earth
*does low light photosynthesis in great depths but can also be near the surface
How does P.marnius use chlorophyll
diviynl chloro a and b derivited, but chlorob is rare for cyanobacteria it facilates the low light conditions
draw chlorophyll abundances vs P.marinus
draw
oligotroph nutrient status
have less nutrients
What are photosystems
absorb photons and use it to energise e-s
List major microbial groups w/ phototrophs
plants find every ccc
1. cyanobacteria
2. proteobacteria
3. chlorobi
4. chloroflexi
5. firmicutes
6. euryarchaeota
name and desrcibe each major microbial phototroph group
- cyanobacteria: green blue algea
- proteobacteria: use same wavelength irrespective of sulfur accumilation, there is PSB (2 related gammaproteofamiliies) and PNSB dispered genera
- chlorobi: green sulfur bacteria
- chloroflexi: green non sulfur filamentous bacteria
- firmicutes: heliobacteria
- euryarchaeota: halobacteria archaea
draw straification and which organisms may live there
draw
What is oxygenic photosynthesis waste products, structure, implication
2 photosytmes PS2(high oxidiser) and PS1(weak oxidser)
O2 is waste product, but cyanobacteria is not affected by oxygen damage
Chemotrophs vs phototrphs energy
high energy e- by chemotrophs
low energy e- by phototrophs
