Column exposed to sunlight
We can now appreciate how different microorganisms have developed depending on how different the conditions were (light, O2 availability...).
First of all, let's talk about the light side. We can see how a sort of greenish colour appears due to the presence of photosynthetic organisms. In the upper part this is caused by the growth of green algae, whereas we move down, the coloration is a result of the cianobacteria more than algae. Several bubbles got trapped in the crannies of the bottle's wall (this demonstrates that photosynthesis is happening here).
On the other hand, the dark side shows black coloration. Only those microorganisms capable of obtaining energy from redow reactions grow here (these organisms are probably lithotrophic). We can find sulphurous bacteria (thanks to the sulphur hydride), oxidative bacteria (responsible of the coppery limits between the light and the dark side) and some more.
Surprisingly, we found an intruder!! There is a little snail living inside our column!
Column that developed without light
We observe how that black colour at the bottom has gotten even darker. And, just like it was two weeks ago, as we go up in our column, that black colour gradually turns to a grey that becomes a little lighter.
At the top of our column, that iron oxyde (which presented a dark orange colour) layer we spoke about the last time got even thicker.
The water layer has not changed on the past two weeks.
Stay tuned for more news!
Pictures....???
ReplyDelete