The Japanese Green Syllid Megasyllis Nipponica, Is A Bristle Worm Native From The Coast Of Japan, But

sieveplayer - Sieve's

The Japanese green syllid Megasyllis nipponica, is a bristle worm native from the coast of Japan, but now is know to live in coastal parts of California where is stablished. This little dance seen in the GIF have a reproductive reason, and researchers now explaing better what is happening, and you may not be prepared to this.

The brown and dancing body segment is called the stolon, which detaches from the worm in a unique reproductive process called stolonisation or schizogamy. When gonads are matured, the stolon developed a head, which even posses eyes, antennae and bristles, then the stolon can break off and swim away, to break apart to release eggs or sperm. This bizarre process continues before the stolon detaches when it develops nerves and a ‘brain’, allowing it to swim independently from the original body.

sieveplayer - Sieve's
sieveplayer - Sieve's

Video and figure by Nakamura et al 2023

Reference (Open Access): Nakamura et al. 2023 Morphological, histological and gene-expression analyses on stolonization in the Japanese Green Syllid, Megasyllis nipponica (Annelida, Syllidae). Sci Rep

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2 years ago

Problem: depicting villains whose villainy lies in having extreme and unreasonable reactions to objectively intolerable bullshit risks framing any objection whatsoever to the bullshit in question as unreasonable, thereby tacitly advocating for the status quo.

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2 years ago

I think a lot about manufacturing processes because they’re the most impressive things humanity has ever done and injection moulding wacks me out the most. I was looking at the toy keyboard I bought a while back and it got me thinking about how much of what we consider to be the look of The Modern Era is down to injection moulding.

I Think A Lot About Manufacturing Processes Because They’re The Most Impressive Things Humanity Has

I hold that injection moulding is one of the pillars of modern society and technology. Can you imagine a world where you couldn’t use injection moulding. It’d look completely foreign. Like looking into an alien world. When you consider it you have to conclude that injection moulding has shaped our culture as much as the development of the camera or the invention of the piano or the creation of glassblowing. If archaeologists had to name our culture in the style of the Corded Ware culture or the Funnel Beaker culture, we’d be the Injection Moulded Plastic culture.

Injection moulding is how we get, oh, almost every plastic thing you’ve ever seen. The keys on your keyboard are injection moulded. Your phone case is injection moulded. Unless you’ve got a fancy milled metal laptop like a macbook then your laptop’s chassis is mostly injection moulded plastic. Your lightswitches are injection moulded. Plastic water bottles are injection moulded. Injection moulding is how we can produce extremely similar objects at breakneck pace for almost no money.

Now it’s important to rememeber that injection moulding isn’t cheap, or, well, injection moulding is only cheap for mass production. Every single unique piece of plastic needs a mould, and each mould will cost somewhere around thousands to tens of thousands of dollars EACH, depending on how tight the tolerances are and how complex the geometry is. Look at how many unique plastic pieces there are on that keyboard. Each one represents an investment of like $7000 into making this toy that gets sold for about $20, so there’s no way this would get made unless the company had plans to sell literally hundreds of thousands of these things.

I Think A Lot About Manufacturing Processes Because They’re The Most Impressive Things Humanity Has

(This mould can spit out one chair every 30 seconds and it probably cost twenty thousand dollars to make)

Once you learn to see injection moulding you can’t unsee it. It’s like learning about kerning, or musical intervals, or disability compliant designs, or the pantone colours, or about how many insulator disks are needed on different voltage power lines. You start to see it everywhere, you realise that everything in your life relies upon our ability to jam plastic through a heated screw and into a mould reliably, hundreds of times per day, all day, every day.

Unless you’re wandering alone in the wilderness (and even then, maybe: check your clothing), look around and see if there’s something injection moulded near you. I can tell you the answer, there definitely is. It’s inescapable.

What would a world without injection moulded parts look like? It’d be weird. Everything we think of as cheap and easy to make is suddenly expensive. Complex curves and slopes like you’d find on a one dollar potato peeler now require hours of work to form. Every budget consumer item would be like those cheap sheet metal PC cases that have drawn blood from everyone who build a PC in them. Everything now has the aesthetics of a Sun 3/280 system:

I Think A Lot About Manufacturing Processes Because They’re The Most Impressive Things Humanity Has
I Think A Lot About Manufacturing Processes Because They’re The Most Impressive Things Humanity Has

Heck, even this sheet steel cube has a dozen injection moulded parts visible.

All the chunky plastic housing of the 90′s and 2000′s, all the sleek curves of the 2010′s, all the cheap plastic knick-knacks, the plastic toy horses, the snugly-fitting appliance chassis, the stacking plastic chairs. All these things now cost ten times as much and have to be formed from heavy steel, or milled out of chunks of cast plastic, or replaced with formed sheet metal.

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Selected recurrent patterns or "laws" of evolution, of potential use for speculative biology. List compiled by Neocene's Pavel Volkov, who in turn credits its content to Nikolay Rejmers (original presumably in Russian). These are guidelines, and not necessarily scientifically rigorous.

Dollo's Law, or irreversibility of evolution: organisms do not evolve back into their own ancestors. When mammals returned to the sea, they did not develop gills and dermal scales and change back into fish: they became whales or seals or manatees, who retain mammalian traits and show marks of land-dwelling ancestry.

Roulliet's law, or increase of complexity: both organisms and ecosystems tend to become more complex over time, with subparts that are increasingly differentiated and integrated. This one is dodgier: there are many examples of simplification over time when it is selected for, for example in parasites. At least, over very large time scales, the maximum achievable complexity seems to increase.

Law of unlimited change: there is no point at which a species or system is complete and has finished evolving. Stasis only occurs when there is strong selective pressure in favor of it, and organism can always adapt to chaging conditions if they are not beyond the limits of survival.

Law of pre-adaptation or exaptation: new structures do not appear ex novo. When a new organ or behavior is developed, it is a modification or a re-purposing of something that already existed. Bone tissue probably evolved as reserves of energy before it was suitable to build an internal skeleton from, and feathers most likely evolved for thermal isolation and display before they were refined enough for flight.

Law of increasing variety: diversity at all levels tends to increase over time. While some forms originate from hybridization, most importantly the Eukaryotic cells, generally one ancestor species tends to leave many descendants, if it has any at all.

Law of Severtsov or of Eldredge-Gould or of punctuated equilibrium: while evolution is always slow from the human standpoint, there are moments of relatively rapid change and diversification when some especily fertile innovation appears (e.g. eyes and shells in the Cambrian), or new environments become inhabitable (e.g. continental surface in the Devonian), or disaster clears out space (e.g. at the end of the Permian or Cretaceous), followed by relative stability once all low-hanging fruit has been picked.

Law of environmental conformity: changes in the structure and functions of organisms follow the features or their environment, but the specifics of those changes depend on the structural and developmental constraints of the organisms. Squids and dolphins both have spindle-shaped bodies because physics make it necessary to move quickly through water, but water is broken by the anterior end of the skull in dolphins and by the posterior end of the mantle in squids. Superficial similarity is due to shared environment, deep structural similarity to shared ancestry.

Cope's and Marsh's laws: the most highly specialized members of a group (which often includes the physically largest) tend to go extinct first when conditions change. It is the generalist, least specialized members that usually survive and give rise to the next generations of specialists.

Deperet's law of increasing specialization: once a lineage has started to specialize for a particular niche, lifestyle, or resource, it will keep specializing in the same direction, as any deviation would be outcompeted by the rest. In contrast, their generalist ancestors can survive with a marginal presence in multiple niches.

Osborn's law, or adaptive radiation: as the previous takes place, different lines of descent from a common ancestor become increasingly different in form and specializations.

Shmalhausen's law, or increasing integration: over time, complex systems also tend to become increasingly integrated, with components (e.g. organs of an organism, or species in a symbiotic relationship) being increasingly indispensable to the whole, and increasingly tightly controlled.

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