This is a ciliate, Loxodes magnus. It is about to die. Of course, depending on your time scale...we’re
all about to die. To the grand canyon, or the sun...things that
have existed for millions or billions of years, we are each weird little bubbles of peculiar
chemistry that form and then pop...form, and then pop. But this ciliate, and with our new microscope
you can really see those cilia beating, is about to pop right before your eyes. It looks fine right now. You can even see, inside it, it’s last meal,
a Trachelomonas. So we don’t think it’s starving to death. It seems to be trucking along just fine. Loxodes Magnus are microaerophilic organisms,
preferring a low concentration of dissolved oxygen in their environment, but not too low. So maybe the concentration on the slide was
too high, though we’ve witnessed many others who have been just fine in our preparations. So no, we can’t tell you why this ciliate
is about to die...but we can tell you that right here...that’s where James, our master
of microscopes, first saw something strange. The moment the ciliate shifted direction,
a little trail of cell membrane and cytoplasm. No reason. Nothing grabbed it, it didn’t snag on anything. But a little bit of what was once a part of
the organism was suddenly, no longer a part of it. That cytoplasm is full of complicated molecules
that are what chemists would call, far from equilibrium. Equilibrium is the situation in which chemicals
no longer have a tendency to react over time. In general, a thing that you can say for sure
is that all the stuff outside of living cells is either at chemical equilibrium, or it is
headed there. Whereas stuff inside cells is not at equilibrium,
and it’s not headed there either. How are all of these chemicals that, if left
alone, would rapidly reach equilibrium managing to not do that? Life. That is what life is. A bunch of chemicals that take in energy in
order to keep each other from reaching equilibrium. Quick break from our friend...the way we define
life in biology classes is...wrong. It’s not even really a definition, it’s
a set of qualifying factors. Life has to take in energy. Life has to reproduce, it must respond to
its environment, it must consist of cells. This is not a definition, it’s an attempt
to draw a line, to create a boundary. And that makes sense for things that are actually
amorphous and complicated, like social constructs. But life is not a construct of our opinions,
but of reality. Life is a chemical system that uses energy
to keep itself from reaching chemical equilibrium. Why do they do it? Oh, well maybe let’s not go /that/ deep,
at least not today. Suffice it to say, a system that did this
developed on this planet and now, billions of years later, it is still doing it. We have many things in common with this ciliate,
and not to belabor the point, but one of those things is that we will die. You’ve probablt noticed by now that this
video isn’t about what life is, it’s about what death is. It’s just that, first, we had to define
life. Life is chemicals working together to take
in energy to keep themselves far from equilibrium. Death is not the return to chemical equilibrium. The process of decay can last decades. Likewise, many parts of my body will return
to equilibrium over the course of my life, I’m shedding skin cells right now and so
are you. The atoms and molecules of my body are replaced
with new ones over and over and over again. But I will only die once. Likewise, our ciliate has been shedding cytoplasm
and cell membrane for minutes now, and that shed cytoplasm is dead, no doubt. But the organism lives. Its chemistry continues. For now. Death is the moment when the system that maintains
the far from equilibrium state ceases existence. And we can imagine that at many scales. That can happen to individual bits of an organism,
as it is happening to the chemicals spilling out of our Loxodes right now. It can also happen to an individual cell in
an organism. And that happens all the time. It is happening right now inside you. It can also happen to an organism. That’s what we usually think of as death,
with our focus, so often, on the individual. But we can keep moving up the scale and find
yet other kinds of death. When a common genetic system that was useful
for keeping many similar but individual organisms alive ceases to exist, that is an extinction. A kind of death. And when the system that has kept all life
on earth far from equilibrium for billions of years, that system that we all share of
nucleic and amino acids, when that ceases to exist, that will be something else. A terrible kind of death that we do not even
have a name for. But it will be a death. The largest death, I suppose, until heat death,
when everything in the universe has found equilibrium. Our ciliate is about out of time now. I don’t know when we can call it, when we
can pronounce the time of death, but this seems as good a time as any. Here, we have death. The system that was using energy to keep itself
from reaching equilibrium has ceased to exist. Thank you for coming on this journey with
us as we explore the unseen world that surrounds us. And thank you as always, and of course to
all of the people on the screen right now. These are our Patreon patrons without whom
we could not make this show. So if you want to thank anybody for enabling
the existence of content such as this on the internet, these are the people to thank. If you want to see more from our Master of
Microscopes James Weiss you can check out Jam & Germs on Instagram. And if you want to see more from us, there’s
always a subscribe button somewhere nearby.
Thank you for sharing this! I really enjoy Journey to the Microcosmos, but I don't keep up - it's more when I'm in the mood for it. This episode was great, and I love the definitions of life and death so much!
First time encountering this channel - loved it! Thanks for sharing