That’s a swift death on a cellular scale, not a slow one

There’s this article in the popular press titled “Scientists calculate the speed of death in cells, and it’s surprisingly slow”, and the title is backwards. It’s summarizing an article in Science magazine which measured the speed of a wave of apoptotic signaling in dying cells that concludes the exact opposite: cells die fast.

Apoptosis is an evolutionarily conserved form of programmed cell death critical for development and tissue homeostasis in animals. The apoptotic control network includes several positive feedback loops that may allow apoptosis to spread through the cytoplasm in self-regenerating trigger waves. We tested this possibility in cell-free Xenopus laevis egg extracts and observed apoptotic trigger waves with speeds of ~30 micrometers per minute. Fractionation and inhibitor studies implicated multiple feedback loops in generating the waves. Apoptotic oocytes and eggs exhibited surface waves with speeds of ~30 micrometers per minute, which were tightly correlated with caspase activation. Thus, apoptosis spreads through trigger waves in both extracts and intact cells. Our findings show how apoptosis can spread over large distances within a cell and emphasize the general importance of trigger waves in cell signaling.

To put that in context, 30 µm/min is more than 40,000 µm/day, or 40mm/day. Back in the day when I’d stick proteins in one end of a cell and wait for them to get to the other end, we’d estimate that the rate of transport was a couple of millimeters per day — so if you were working with an axon that was a couple of centimeters long, you might have to wait a week or two for a complete traverse. I’m impressed with 30 µm/min.

Another way to look at it is that if your typical cell is about 10µm across, once the apoptotic enzymes in one spot are activated, the whole cell is self-destructing in 20 seconds. The pop sci article uses a different example: “That means, for instance, that a nerve cell, whose body can reach a size of 100 micrometers, could take as long as 3 minutes and 20 seconds to die.” That’s still fast. That’s faster than diffusion. The authors ruled out diffusion as the mechanism, and suggest that it’s a wave of activation.

The unusual size of the Xenopus egg raises the question of how an all-or-none, global process such as apoptosis spreads through the cell. One possibility is that apoptosis spreads through the egg by random walk diffusion, ultimately taking over all of the cytoplasm. A second possibility is suggested by the existence of multiple positive and double-negative feedback loops in the regulatory network that controls apoptosis. These loops may allow apoptosis to propagate through self-regenerating trigger waves. Trigger waves are propagating fronts of chemical activity that maintain a constant speed and amplitude over large distances. They can arise when bistable biochemical reactions are subject to diffusion or, more generally, when bistability or something akin to bistability (e.g., excitability or relaxation oscillation) is combined with a spatial coupling mechanism (e.g., diffusion or cell-cell communication). Familiar examples include action potentials; calcium waves; and the spread of a fire through a field, a favorable allele through a population, or a meme through the internet. Trigger waves are an important general mechanism for long-range biological communication, and apoptotic trigger waves may allow death signals to spread rapidly and without diminishing in amplitude, even through a cell as large as a frog egg.

That makes sense. The apoptotic enzymes are distributed throughout the cell in an inactive state at all times; you don’t have to physically move the proteins around, you just have to switch one on, which then switches on its neighbor, which switches on its neighbor, and so on.

I’ve seen many cells die, as I’m watching them in the microscope. It’s always impressively swift and thorough: one minute, round, plump healthy cell; next minute, membranes are blebbing out all over the place, the cytoplasm goes all granular and curdled, and at the speed of light I’m cussing over yet another failed experiment.

I’m not sure why the editor or whoever slapped that confusing title on the article. There may have been some confusion about scale: a 2 meter tall human doesn’t die by the propagation of a signal from a single point on a cell, spreading at a rate of 40mm/day (if it worked that way, you’d stub your toe, a cell would die, and you’d have to wait a month and a half for the death signal to reach your brain). That would be slow. Multicellular organisms die by systemic failure of a network, not the progressive collapse, cell by cell, of all of its components.

It’s a war over education

Keep this in mind when you see so-called intellectuals like the gang at PragerU, or Jordan Peterson, or just about any Republican, demonizing universities as the domain of cultural Marxists with entire disciplines in the humanities and social sciences that need to be razed to the ground. They’re not stupid. They know exactly what they’re doing. Wrecking the electorate’s ability to think and process information is what keeps them rich and in power.

Do we support bombing school buses full of children?

Apparently, we do. The US is part of this Saudi-led coalition killing civilians in Yemen, and an American-made 500lb bomb was dropped on a bus with 40 kids on their way to a field trip, killing most of them.

This is just the latest string, unfortunately, of really brutal attacks on civilians in Yemen. It is not the worst of its kind in terms of the numbers of people killed, but certainly because all of the—40 out of the 51 people who were killed were children, it really is just an extreme form of this Saudi-led coalition bombing in Yemen. Here were these kids on a school trip. They were excited. There’s footage—we see them laughing and really being excited. Some of the parents said that they couldn’t really sleep the night before because they were so looking forward to—and here’s the sad part—they’re going to a cemetery just to be able to enjoy some time outside. And as the bus entered a busy market, it was targeted by the Saudi-led coalition and most of these children were killed. Of course, we know that the U.S. is part of the Saudi-led coalition, so we are in fact responsible, just as much as the Saudis and Emiratis are, in the bombing of those children.

You might be wondering how we can justify our participation in these crimes. Have no fear! The excuses are flowing faster than the blood of shattered children. Here’s an AP reporter explaining the logic of the attack.

What is very hard to determine in Yemen is what the children were doing. We worked on covering Yemen since 2015. We know that the Saudi-led coalition has bombed civilian targets all the time—markets, hospitals, schools. This is not a surprise. But we also know that the Houthis are actively recruiting the children and then they send them to the front lines. And the question marks here that are not answered yet—what were the children doing at the time?

There are no schools right now at Yemen. There are no buses carrying children from one school to the house. This is a luxury. The children were visiting a cemetery, and that is where they promote the whole notion of jihad and martyrism. So I mean, on one hand, the Saudi-led coalition is blamed for killing the civilians and this has been ongoing without any—no question about it. But at the same time, we have a look at the other side of the picture and see what the Houthis were doing with the children.

Dude. I’m having flashbacks, man. I grew up during the Vietnam War (I was too young to go, fortunately, but this stuff was in the news all the time), and I remember all the rationalizations for dropping napalm on villages. This is the same old story: we don’t know exactly what these kids were doing, but we can imagine all kinds of nefarious schemes, so let’s pretend after the fact that they were all evil terrorists in training. It is all too familiar.

Let’s ask a Yemeni scholar to reply to that.

To just quickly respond to what your guest just said, it doesn’t really matter what the children were doing. They were children, they were in summer school and for the Saudi-led coalition to bomb a bus full of children is a war crime, regardless of what the children were doing.

Exactly. We’re done. It’s inexcusable.

But he does go on, about all the other children killed in this war.

And to talk about really what the U.S. intervention in Yemen looks like, we know what it looks like. We know the devastation that it has caused. Yemen is falling and all of the services have been failing. 113,000 children died in 2016 and 2017 alone of starvation and preventable diseases such as cholera. What we need from the Senate, what we need from Congress right now is to continue to push toward ending the U.S. involvement in Yemen, given how much the Saudis and the Emiratis rely on U.S. support, on U.S. weapons, on U.S. maintaining and repairing of their aircraft, on U.S. midair refueling and on U.S. targeting assistance.

We know that they cannot continue to wage war on Yemen without extensive U.S. assistance, and Congress needs to act quickly to continue to introduce resolutions in the Senate and in the House to push the U.S. out of Yemen.

The United States has been awfully good at minimizing blood shed on our side, and awfully good at maximizing blood shed and terror in other places. Can we stop, please?

This is what Nazis get

I guess we don’t need to punch ’em now — there’s a worse fate in store for them. Below is a snippet of a video chat between Jason Kessler, organizer of that fizzle of a White Nationalist march that occurred last weekend, and Patrick Little, who I know nothing about other than the nasty bigotry of his anti-semitism in this clip. Listen in and be revolted at first, and then amused.

So they’re complaining about the Jews when Jason’s dad starts yelling at him to get out of his room. He’s been reduced to living in his parents’ house (in the basement, I hope). Little responds by showing off his boat that he had bought when he used to make good money, and thinks he’ll have to sell off to cover his legal bills.

Poverty isn’t funny, except maybe when racists use their hatred as a shovel to dig themselves deep into a hole.

Can organized skepticism do a more spectacular face-plant?

Jebus. Michael Shermer has just proudly announced that the next issue of Skeptic magazine will be dedicated to his fellow member of the Intellectual Dork Web, Jordan B. Peterson.

David Gorski has been scathing. I agree with him.

Whatever it is Shermer is peddling, it ain’t skepticism. It’s closer to cult-like dogma.

There was a time, in the ancient of days, when skeptical magazines would take a Cuisinart to the kind of incoherent babbling woo that Peterson spins. Now they dedicate whole issues to praising him.

Bwahahaha!

Evil Cat and I are made for each other, I guess. She follows me all over the house, and during the day, she lurks in my office glaring at me. She likes to lounge about on the carpet, like so:

But here’s the amusing part: she has those curved needle-like claws, like fish-hooks at the ends of her paws, and even though she must monitor me, that carpet snags her claws fiercely. She sometimes sits there, staring me down, and starts flexing those claws, in a hostile, intimidating way.

I wait for that and then leap out of my chair and stride purposefully from the room, as if I have something important to do, like opening a can of tuna, and she tries to follow, but she’s hooked — and then there follows lots of yowling and thrashing about as she tries to get free. Sometimes she rolls herself right up in the carpet with her struggles.

And I laugh, evilly.

See? We’re a pair.

The November elections will be…interesting

I took a look at the Minnesota primary election results. There weren’t really any surprises, although there was one disappointment.

The disappointment is that Tim Walz will be the DFL candidate running for governor in November. I despise Tim Walz — he’s a conservative Democrat who has been in the pocket of the NRA for years. What’s particularly galling about it is that I keep seeing people saying that they voted for Walz because he was most appealing to outstate (the obnoxious term people in the Twin Cities use for the region outside the Twin Cities) voters, so they were supporting the DFL candidate most likely to win over those Neandertals who don’t reside in the metropolitan region.

I live in “outstate” Minnesota. Grrrr. Don’t assume we’re all gun-totin’ rednecks out here.

The one bit of good news was the election turnout — record numbers all around. Most importantly, there were 600,000 DFL voters and 300,000 Republican voters. You’ve got to wonder how any Republicans ever get elected.

(Rhetorical question: it’s because of criminal levels of gerrymandering, and because in most elections voter apathy is high.)

The plague is spreading!

Who will be the next prime minister of Australia? Fraser Anning or Bob Katter? Anning made an open call to Australian racists, and as we Americans can tell you, that’s politically potent.

Fraser Anning, from the conservative Katter’s Australian Party, called for migration bans on Muslims and others in his maiden Senate speech on Tuesday.

Political opponents denounced his speech as “disgraceful”. Mr Anning said he did not need to apologise.

“Final solution” was a term infamously used by the Nazis during the Holocaust.

In his speech, Mr Anning said “the final solution to the immigration problem is a popular vote”.

On Wednesday, lawmakers across the political divide moved to pass parliamentary motions censuring Mr Anning for his “racist hate speech”, noting in particular his use of the phrase “final solution”, and his “false, misleading and hurtful statements” about Muslim Australians and other immigrant groups.

The Australians, I’m sure, are torn between indignation and amusement that these two flaming nutters and their party have even a remote chance of taking over the government, but we were laughing at Trump ten years ago, too.

The disease is spreading. I know the racism has been there all along, but the plague in this case is that so many awful people now feel emboldened to preach it openly.

Can a feminist or a woman be guilty of sexual harassment?

How about a feminist woman? They certainly can. All it seems to take is a power differential and sexual desire, and in the absence of restraint, along comes another case of sexual harassment. Read about the case of Avital Ronell, a famous feminist scholar, who took advantage of her position to be rather, umm, forward with her student, Nimrod Reitman. It’s all documented in embarrassing emails.

It’s all about hierarchies and power, so of course a woman can be guilty of harassment.

Reitman says he put up with this behavior because Ronell had power over him as his adviser, Greenberg reports. He also says that when he did complain to Ronell about her harassment, she retaliated by sabotaging his job prospects. Graduate students can be especially vulnerable to harassment by their advisers, who often wield enormous control over the direction of their careers.

What’s also shocking is how many other well-known feminists leapt to Ronell’s defense. It’s a serious problem when justice is strongly skewed by differences in power.

We clearly need to foster more irreverence in our culture.