What's the difference between nematoblast and nematocyst?
Nematoblast
Definition:
(n.) A spermatocyte or spermoblast.
Example Sentences:
(1) Positive immunoreactivity was observed in ectodermal nerve cells and fibers as well as in nematoblasts at various stages of differentiation.
(2) A new factor, presumably unrelated to any of the known morphogens, has been identified which specifically inhibits the developing nematoblasts to differentiate into stenoteles.
(3) It appears that either the nematoblasts are not committed to any specific nematocyte pathway until this critical time, or the nematoblasts committed to differentiate into a specific type can transdifferentiate into another type at this step.
(4) Nematoblasts which normally differentiate into one nematocyte type can be altered to differentiate into another by means of regeneration or treatment with stenotele inhibitor.
(5) Nerve differentiation was scored by labelling the stem cell population with [3H]-thymidine and counting nests of 4 proliferating nematoblasts.
(6) Hydra treated with colchicine or Colcemid become depleted of 95-99% of their interstitial cells and derivatives of this stem cell: nematoblasts, nematocytes and nerve cells.
Nematocyst
Definition:
(n.) A lasso cell, or thread cell. See Lasso cell, under Lasso.
Example Sentences:
(1) Nematocyst capsules and everted threads from both species contained levels of glycine and proline-hydroxyproline characteristic of vertebrate collagens.
(2) Purified nematocyst capsules and threads are rich in hydroxyproline, and dissolved by disulfide reducing agents.
(3) Investigation on important medusae and the chemistry of their nematocyst venoms have been expanding.
(4) They are considered to be the principal toxins injected by C. fleckeri during nematocyst discharge and appear to be different from the C. fleckeri toxins described by other workers.
(5) A new cytolysin has been isolated from the nematocysts of the jellyfish, Rhizostoma pulmo, and named rhizolysin.
(6) A comparison of methods for preparing a jellyfish nematocyst suspension from sea nettle (Chrysaora quinquecirrha) fishing tentacles at the beachside was conducted.
(7) Evidence obtained from the osmotic behavior of nematocysts, as well as data from in vitro exchange of their cations, are consistent with a physicochemical model in which the internal osmotic pressure of nematocysts and thus their ability to discharge is governed by the cationic composition of the content and the salt concentrations in the environment.
(8) Cnidocytes, the stinging cells of cnidarians, discharge nematocysts in response to physical contact accompanied by the stimulation of specific chemoreceptors.
(9) In the tentacles, neurons with long processes contacted up to five different batteries of nematocysts.
(10) It is suggested that they may also be present as predominant components in nematocysts of other cnidarian species and thus might represent a class of compounds which is characteristic for a whole phylum of the animal kingdom.
(11) Electrophoretic characterization of nematocyst extracts allows resolution of small proline-rich polypeptides that correspond in size to the cloned sequences.
(12) The major protein component present in the capsule and thread of a sea anemone nematocyst consists of monomers of a collagen-like protein linked by disulfide bonds.
(13) First-aid measures designed to prevent additional nematocyst rupture are species-specific.
(14) One such defective strain, called nem-4, contains virtually no stenoteles, one of the four types of nematocysts present in hydra, in its tentacles.
(15) The CSMs become predisposed to initiate nematocyst discharge into static (i.e., nonvibrating) test probes in the presence of submicromolar free and conjugated N-acetylated sugars, a process referred to as sensitization.
(16) It is suggested that the high concentration of calcium in the nematocysts accounts for their staining by cobalt and morin.
(17) Crude extract prepared from isolated and purified nematocysts (stenoteles, desmonemes, isorhizas) of Hydra attenuata Pall.
(18) Contrary to some previous reports in the literature, it has been found that spirocysts normally discharge by eversion, as do nematocysts.
(19) Unlike most nematocysts, undischarged spirocyst threads bear hollow tubules rather than spines.
(20) The toxins are labile when released from nematocysts and they lose all myotoxic activity within 3 days at 5 degrees C. They can also be isolated chromatographically from crude extracts of the contents of mixed nematocysts of C. fleckeri.