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Scientists identify microbe that could help degrade polyurethane-based plastics

phys.org

31–40 of 77 posts

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#31
post #3

Is anyone else concerned about the effects this could have if it managed to get out of containment and into the wild? A self-replicating bacteria that eats plastics sounds like a potentially catastrophic event, considering how much we use them in day to day life.

A bactery that eat oil and you have the movie mad max

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#32
post #3

Is anyone else concerned about the effects this could have if it managed to get out of containment and into the wild? A self-replicating bacteria that eats plastics sounds like a potentially catastrophic event, considering how much we use them in day to day life.

We use too much plastic, too casually, wastefully, with eventual results of microplastic and carbon release into the atmosphere. I would not weep in the least if this stuff blew around world-over and forced us to change our behaviour.

Water, gas, sewage, electricity and telecom lines are conducted/coated with PET.

You would weep.

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#33

These microbes are surprisingly hard to scale up i.e. to make them work on large amounts of product at a time. (My wife did research on such bugs for a while). All sorts of things start happening once you have a lot of them, and the process becomes incredibly tricky to keep going.

So you breed them in an environment interspersed with other things? There seem to be at least 5 organisms that do some level of plastic digestion.

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#34
post #3

Is anyone else concerned about the effects this could have if it managed to get out of containment and into the wild? A self-replicating bacteria that eats plastics sounds like a potentially catastrophic event, considering how much we use them in day to day life.

Another possibility: the bacteria could be engineered to switch to a different metabolic mechansim, like the use of the lac operon to digest lactose instead of glucose whenever there's a scarcity of glucose. Although this envisages stably engineered bacteria that switch between plastic and regular metabolic process, which I'm not sure about the current feasibility/precision.

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#35

These microbes are surprisingly hard to scale up i.e. to make them work on large amounts of product at a time. (My wife did research on such bugs for a while). All sorts of things start happening once you have a lot of them, and the process becomes incredibly tricky to keep going.

Do they get fat and lazy? [Maybe we should invent Netflix for microbes, then]

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#36
post #35

These microbes are surprisingly hard to scale up i.e. to make them work on large amounts of product at a time. (My wife did research on such bugs for a while). All sorts of things start happening once you have a lot of them, and the process becomes incredibly tricky to keep going.

Do they get fat and lazy? [Maybe we should invent Netflix for microbes, then]

(Paraphrasing because of my limited understanding of what my wife did)

The biological pathway that makes them eat plastic is pretty card to keep activated. It's not a very profitable pathway, so the bugs tend to try eating other stuff if there is even a little available, or they are even a little outside the optimal range for eating plastic.

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#37
post #3

Is anyone else concerned about the effects this could have if it managed to get out of containment and into the wild? A self-replicating bacteria that eats plastics sounds like a potentially catastrophic event, considering how much we use them in day to day life.

The article implies that this microbe was found in the wild, rather than engineered in a laboratory. The paper confirms it - https://www.frontiersin.org/articles/10.3389/fmicb.2020.0040...

Bacteria that eats nylon was first found in the wild: https://en.wikipedia.org/wiki/Nylon-eating_bacteria

With this in mind, it may be worth considering that plastic-eating bacteria that currently exist in the wild do not appear to present any significant threat of a catastrophic event. I'm sure it's just an oversight on my part, but can you help me understand why this newly identified strain would pose a threat?

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#38
post #2

Have there been studies about the dangers of these types of microbes spreading out into the "wild"?

As a lay person, I currently get the distinct impression that polymer-digesting microbes are not currently considered dangerous, with the current impacts being negligible.

What kind of dangers and impacts would you like to see studied?

Re: Scientists identify microbe that could help degrade polyurethane-based plastics

#40
post #37
post #3

Is anyone else concerned about the effects this could have if it managed to get out of containment and into the wild? A self-replicating bacteria that eats plastics sounds like a potentially catastrophic event, considering how much we use them in day to day life.

The article implies that this microbe was found in the wild, rather than engineered in a laboratory. The paper confirms it - https://www.frontiersin.org/articles/10.3389/fmicb.2020.0040... Bacteria that eats nylon was first found in the wild: https://en.wikipedia.org/wiki/Nylon-eating_bacteria With this in mind, it may be worth considering that plastic-eating bacteria that currently exist in the wild do not appear to…

By selectively breeding them to be more efficient at breaking down plastics faster, one might be increasing the risk of a runaway 'plastic-rot'.

I'm not concerned yet though, since current landfill sites are effectively perfect selective breeding grounds for 'plastic rot', yet so far we haven't detected any significant increase in the breakdown speeds of plastics in the environment.

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