Results 221 to 230 of about 21,617 (253)

Tetrodotoxins in Larval Development of Ribbon Worm Cephalothrix cf. simula (Palaeonemertea, Nemertea)

Marine Biotechnology, 2023
The toxic ribbon worm, Cephalothrix cf. simula (Palaeonemertea, Nemertea), possesses extremely high concentrations of tetrodotoxin (TTX). Although TTX has been found in the eggs of this species, the fate of the toxin in the ontogeny of the animal has not been explored. Here, using high performance liquid chromatography with tandem mass spectrometry and
P V Velansky, Daria I Melnikova, Timur Yu Magarlamov   +2 more
exaly   +3 more sources

Tetrodotoxin and related substances in a ribbon worm Cephalothrix linearis (Nemertean)

Toxicon, 1990
A ribbon worm Cephalothrix linearis (Nemertean) showed a high toxicity, of up to 22,000 MU/g proboscis and 13,600 MU/g body, in terms of tetrodotoxin. This organism secreted the toxin from the skin when wiped with gauze. The toxin was partially purified from the secretion as well as the wiped body by ultrafiltration and Bio-Gel P-2 column ...
Osamu Arakawa, Tamao Noguchi, Y Shida
exaly   +3 more sources

Distribution and Phylogenetic Position of the Antarctic Ribbon Worm Heteronemertes longifissa (Nemertea, Pilidiophora)

Water (Switzerland), 2023
To date, a total of 23 valid species of heteronemerteans belonging to 15 genera have been recorded in Antarctic and Subantarctic waters. The ribbon worm Heteronemertes longifissa (Hubrecht, 1887) is the only heteronemertean species reported to have bipolar distribution, but this statement is doubtful. The phylogenetic relationships of H.
Alexei V Chernyshev, N E Polyakova
exaly   +2 more sources

Tetrodotoxin in two species of ribbon worm (Nemertini), Lineus fuscoviridis and Tubulanus punctatus

Toxicon, 1988
Extracts of two species of ribbon worm, Lineus fuscoviridis and Tubulanus punctatus, had lethal potencies in mice from 15-503 MU/g of worm and from less than 10-540 MU/g, respectively. The toxins were partially purified by ultrafiltration and column chromatography using Bio-Gel P-2 and Bio-Rex 70 (H+ form).
Tamao Noguchi, Osamu Arakawa, Y Shida
exaly   +3 more sources

Defect Categorization of Ribbon Blender Worm Gearbox Worm Wheel and Bearing Based on Artificial Neural Network

Eksploatacja I Niezawodnosc
There is a demand for worm gearboxes in diversified industrial fields that include machinery such as escalators, ribbon blenders, pulverisers, bowl mills, etc. because of their peculiar characteristics like torque and quick retardation. The most commonly occurring defects in a worm gear box are scratches that develop in the worm gear and in bearings ...
Raghavendra R Barshikar, Harshvardhan P Ghongade, Anjali Bhadre   +2 more
exaly   +2 more sources

High Rates of Self-Fertilization in a Marine Ribbon Worm (Nemertea)

The Biological Bulletin, 2015
Organisms capable of self-fertilization ("selfing") typically exhibit two evolutionary syndromes: uniting high inbreeding depression with low levels of selfing, or low inbreeding depression with high levels of selfing. We examined the effect of inbreeding on fecundity and time to first reproduction in an apparently self-compatible, simultaneously ...
Serena A, Caplins, James M, Turbeville
openaire   +2 more sources

The toxicity of ribbon worms: Alpha-nemertides or tetrodotoxin, or both?

Planta Medica, 2016
The marine ribbon worms (nemerteans) are predators which capture their prey by everting a proboscis carrying a mixture of toxins which brings on rapid paralysis [1].
Andersson, H. S., Jacobsson, E., Eriksson, C., Hedstrom, M., Seth, H., Sundberg, P., Rosengren, K. J., Strand, M., Goransson, U.   +8 more
openaire   +2 more sources

New records of ribbon worms (Nemertea) from Ceará, Northeast Brazil

Zootaxa, 2016
Of 45 species of nemerteans reported for the Brazilian coast, only two were recorded from Brazil’s Northeast coast. Here we report seven new records for the state of Ceará, in Northeast Brazil: Tubulanus rhabdotus Côrrea, 1954, Carinomella cf. lactea Coe, 1905, Baseodiscus delineatus (Delle-Chiaje 1825), Cerebratulus cf.
Mendes, Cecili B., Matthews-Cascon, Helena, Norenburg, Jon L.   +2 more
openaire   +3 more sources

Flatworms and Ribbon Worms

1995
Abstract These ‘flatworms’ are bilaterally symmetrical, with marked cephalization, mostly with a mouth, gut, and protonephridia, and typically with hermaphrodite reproductive systems, but without a special body cavity, anus, or circulatory system. Five classes may be recognized.
R Gibson, E W Knight-Jones
openaire   +1 more source

Biodiversity Record: Terrestrial ribbon worms (genus Geonemertes) predation on arthropods

2023
Nature in Singapore, 16, 1 ...
Ong, Rene S. L., Yap, Eehean, Chuah, Tuang Heok, Goh, Adeline, Seah, Andrew, Soh, Kam Yung   +5 more
openaire   +1 more source