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Dr. Ben Larson

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117 total appearances
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Podcast Appearances

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

random subset of the population that's making this choice.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

And we really don't know what they're specifically using to make that decision, what sort of underlying cell machinery makes that transition happen.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

But nevertheless, it's maintained at this relatively low level.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

So maybe it's a risky decision.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

We don't really know.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

There's more that we don't know than that we do know at this point, I think.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

Yeah, so it seems unlikely that there's a genetic basis.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

Like you said, it's in this clonal population.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

So it's genuinely a mystery.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

I mean, it could have to do with RNA levels, with protein levels, with other, you know, physiological levels in the cell.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

And it may be very hard to find that, you know, what flips that switch.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

But one little piece of information that we do have is that, okay, so it's an extremely small subset.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

There's maybe, you know,

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

only up to 5% of the population that we ever see in this cannibalistic form.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

It may be that more cells are sporadically trying to become these giants.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

So the first sign that the cannibals are going to show up is that basically the mouth of the cell gets much bigger.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

So before the cell body scales up, there's a bigger mouth that can maybe accommodate these large prey items.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

And I think that these cells that are sort of an intermediate phase, they're very bad at hunting.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

And so it ensures that there is this population density that's high enough that even a bad hunter can catch a prey item.

Science Friday
Swords, cannibalism, poison: inside the world of killer microbes

And so it may be a very rare event that these big mouthed but small cell body cells can capture a prey item.