(n.) A sexual zooid produced as a medusoid bud upon a hydroid, sometimes becoming a free hydromedusa, sometimes remaining attached. See Hydroidea, and Illusts. of Athecata, Campanularian, and Gonosome.
(n.) A lengthened receptacle, bearing the stamens and carpels in a conspicuous manner.
Example Sentences:
(1) On the basis of the findings of their investigation of the embryogenesis of the female genital tract, the authors advance a hypothesis concerning the origin of ambiguities between the genetic sex and the gonophoric sex which determine primary sexual characteristics observed in Morris' syndrome and in gonadoblastoma.
Hydroid
Definition:
(a.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea.
(n.) One of the Hydroideas.
Example Sentences:
(1) The particles are surfaces for the attachment of diatoms and hydroids.
(2) A technique is described which was developed for this purpose with the use of a clonal hydroid; preliminary results from Swansea Bay show that it is sensitive to the variations in water quality that occur there.
(3) Aqueous extracts of the colony portions were assayed using six bioassay regimes namely, toxicity to mice, toxicity to a coral and a hydroid, cytolytic activity on sheep erythrocytes and sea urchin ova and for antimicrobial activity on eight bacterial species.
(4) Perhaps in the stem lineage of the Bilateria a hydroid-like or medusoid-like ancestor fell over on one side onto a substrate (pleurothetism).
(5) Hydranths of the colonial marine hydroid Campanularia flexuosa (phylum Cnidaria, class Hydrozoa, order Calyptoblastea) have a mean life span of approximately 7 days in intact colonies in culture.
(6) We have sequenced three partial (77 bp) fragments of Antennapedia (Antp) class homeoboxes from the hydroids Hydractinia symbiolongicarpus and Eleutheria dichotoma.
(7) Three thecata hydroid species also grew in large numbers on the surface of the weeds.
(8) Trimethyl amine oxide, dimethyl amine and choline chloride have been isolated from the marine hydroid Tubularia larynx and identified using physical constants and spectral data.
(9) In contrast with hierarchies in other hydroids, T. solitaria's HP system dominates the SP system.
(10) Support provided by the desmocytes to the upright stolon is limited by three factors that characterize the athecate hydroid: distribution of perisarc, pattern of growth, and extent of movement.
(11) Obelin, the Ca(2+)-activated luminescent protein from the hydroid Obelia geniculata, was sealed inside pigeon erythrocyte ;ghosts' in order to investigate effects on their permeability of different methods of preparation and of the bivalent cation ionophore A23187.
(12) Data from experiments, in which colonies of a hydroid, Laomedea flexuosa, were exposed to a range of Cu2+ concentrations and a marine yeast, Rhodotorula rubra, was exposed to a range of Cd2+ concentrations, not only exhibit hormesis, but also suggest how its occurrence in growth experiments might be explained.
(13) Treatment of developing colonies of Podocoryne carnea, a hydractiniid hydroid, with dilute solutions of 2,4-dinitrophenol (DNP), an uncoupler of oxidative phosphorylation, accelerates the usual ontogenetic trajectory of polyp and stolon production.
(14) Pholasin could not be reactivated using chromophores from the hydroid Obelia geniculata (coelenterazine) and from the ostracod shrimp Vargula (formerly Cypridina) hilgendorfi.
(15) The form of the path of attracted chiton sperm is like that observed during chemotaxis of the sperm of the hydroid Tubularia and the tunicate Ciona and resembles the behavior of Ciona sperm in that there is no increase in velocity as the cells move up the gradient.
(16) In its normal ontogeny, Hydractinia symbiolongicarpus, a closely related hydractiniid hydroid, not only shows morphological heterochrony similar to that induced in P. carnea by DNP, but also shows a pattern of gastrovascular flow similar to that observed in P. carnea under treatment with DNP.
(17) Three hemolytic constituents have been isolated from the hydroid Solanderia secunda.
(18) A method has been developed to incorporate the apoprotein of the Ca2+-activated photoprotein obelin, and mRNA purified from the hydroid Obelia, into the cytoplasm of intact human neutrophils.
(19) The low-molecular weight proportion altering factor (PAF) from colonial hydroids has general animalizing effects on morphogenesis in hydroid development.
(20) It is probable that the orientation of filaments within the cell and the mesogleal extension provide an addition feature of flexibility necessary to permit feeding, growth, and rhythmic pulsation movements characteristic of these hydroids.