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Paramecium don't like sugar?

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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Paramecium don't like sugar?

Postby pdavis68 » Fri Apr 21, 2006 10:20 pm

The same specimens from my other question:

were used in this little experiment.

Basically, I put a drop of the water (loaded mostly with paramecium and some colpoda (and to a lesser extent, some other creatures) on a slide. While watching the slide, I added a couple of grains of regular table sugar (sucrose) to the water.

I hypothesized that it might be a good source of food. Instead, it was more like a potent poison. Just a few grains wiped out a good portion of the paramecium. They died quickly and then their cellular membranes broke down.

The ones not so close survived. A few would venture into the areas where the sucrose had dissolved and they appeared to be fine, but the vast majority congregated in an area away from where the sugar disolved, so I suspect, at the very least, they don't like it.

My question is, can someone explain this to me?

Is the sugar too acidic? I tried dissolving a good amount of sugar in some water (didn't measure, so this isn't terribly precise, but pretty much saturated the water) and then tested the pH. It was 6. So not terribly acidic, but maybe enough to kill them.

Anyway, just curious.

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Postby Poison » Fri Apr 21, 2006 11:03 pm

Not acidic, but probably hypertonic.
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Postby pdavis68 » Fri Apr 21, 2006 11:31 pm

Ah, I hadn't considered that. Thanks.
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Re: Paramecium don't like sugar?

Postby moonstroller » Tue May 28, 2013 11:37 pm

This is interesting. I did the same thing with some Paramecium. I have a cultur of Paramecium. I fed them some yeast that I had put some sugar in for the yeast to grow. I then put some a few grains of sugar (4-5 perhaps) in the drop on the slide. I left and came back and all the Paramecium were no longer moving. Their bodies did not desentigrate however. They were all full of yeast.

It made me wonder if perhaps sugar might do the same thing to our gut bacteria. Does anyone know how to crow a culture of gut bacteria to try this out?

I know sugar can't be all that good for us. I have a friend who does not eat sugar, nor has he allowed his children to eat it from birth. They do consume honey. His kids are so smart, well mannered, and mature for their age (in their late teens now).
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Postby JackBean » Thu May 30, 2013 3:17 pm

and what do you think honey is? Protein?

Cis or trans? That's what matters.
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