Sentences with word «nematocyst»

«This species is small, less than two centimeters (three - quarters of an inch) across the bell, they're 96 % water, they lack a defined brain or central nervous system, and yet they're using their tentacles and nematocyst clusters like experienced fishers use their lines and lures,» lead author Robert Courtney said.

But Fenner's team found that when applied to the sting of Physalia physalis, a jellyfish newly identified in Australian waters, vinegar actually caused 30 per cent of nematocysts to fire (Medical Journal of Australia, vol 158, p 498).

Capsules on the tentacles called nematocysts contain a hollow, coiled thread.

Whereas the acceleration of cnidarian nematocysts is driven by high internal pressure, the dinoflagellates lack the necessary metabolic pathways.

In fact, structurally comparable weapons systems, called nematocysts as well, are found in a group of modern protozoans, the dinoflagellates.

«The stinging nematocysts of cnidarians closely resemble those of dinoflagellates, but the ballistic mechanisms are different and they don't appear to share any genes.»

Figure right: Dinoflagellate Nematodinium containing the spear - like nematocyst.

Once rinsing deactivates all the nasty nematocysts, the attached bits of tentacle can be removed by coating them with shaving cream or a slurry of seawater and sand followed by shaving with a razor or even a credit card.

Such rinsing will deactivate those pesky nematocysts that are still hanging on.

The comparative study is based on a comprehensive proteome analysis of isolated Cnidarian nematocysts by the Heidelberg researchers.

They have large nematocysts, which Leander describes as «little harpoons,» for catching prey.

The tentacles contain stinging nematocysts, venom - injecting capsules, used to paralyze and kill fish and other small creatures.

These specialized cells have organelles called nematocysts that contain venom.

In reaction to this change, the nematocysts in the cells release more venom — and cause more pain.

Scratching it, though, can make the pain worse, because rubbing activates the nematocysts, which release more venom.

«The nematocyst clusters look like a series of bright pearls, which the jellyfish twitches to attract the attention of its prey, like a series of fishing lures,» Mr Courtney said.

They contract their tentacles down to four to five centimeters (approx. 1.5 to 2 inches) long, with the nematocyst clusters all bunched up.

In daylight, the tiny jellyfish went fishing — stretching their tentacles out as long as 1.2 meters (3» 10») with the nematocyst clusters evenly spaced along each almost - invisible thread, like a fishing line.

Despite its radical phasedown of the modern jellyfish's body structure and genome over millions of years, Myxozoa has retained the essential characteristic of the jellyfish — its stinger, or «nematocyst» — along with the genes needed to make it.

Once a fish makes contact with the nematocyst clusters it is quickly paralyzed by Carukia barnesi's powerful venom.

They attract larval fish by twitching their extended tentacles, highlighting their nematocyst clusters (stinging structures) and using them as lures.

The nematocysts consist of a capsule and folded tubule, and use high pressure and acceleration for defense and locomotion and, more importantly, to capture prey.

In 1980, R. J. Hartwick and others showed that vinegar, which contains acetic acid, stops the discharge of the nematocysts (Medical Journal of Australia, vol 1, p 15).

It does not treat any stinging that has already occurred, but it does prevent any nematocysts that have not already injected their poison from doing so.

When the nematocyst is disturbed, a lid opens and the thread is fired like a harpoon.

Ethanol was used to trigger discharge of the nematocysts.

This may happen some time after the nematocysts have attached themselves.

About 2 litres of vinegar, applied to the skin over 30 seconds, will cause the nematocysts to dehydrate and shrivel up.

The eponymous cell type of the 500 - million - year - old Cnidaria is the cnidocyte, which contains microscopically small organelles — the stinging capsules also known as cnidocysts or nematocysts.

They analyzed the DNA of the dinoflagellates to determine if their ballistic mechanism was similar to the stinging organelles (nematocysts) of cnidarians, such as the jellyfish.

Figure left: Cnidaria (Hydra) nematocyst.

Yet high - resolution 3D images of the nematocysts show a previously unknown complexity and similarity in the biomechanics of discharge.

According to the researchers, the lip mucus probably serves a double purpose, forming a seal on the coral's surface while shielding the fish from stinging barbs known as nematocysts.

These cells contain nematocysts, which are venom - filled structures that sting their prey.

Ringed Anemone: Bartholomea annulata -(semi-transparent with delicate whitermarkings - nematocysts) In crevasses on the reef, or in dead conch shells, this anemone has long transparent tentacles that can elongate and contract to a very great extent.

These tentacles are equipped with stinging cells (nematocysts) that paralyze the fish, then the tentacles shorten to bring the food into the digestive system.

They are often confused with jelly fish but they do not have the nematocysts (stinging cells).