| the effect of different zooxanthellae on the growth of experimentally reinfected hosts. | 1. a method is given enabling the differential effects of different strains of zooxanthellae on host growth to be assessed. this technique uses the increase in the number of tentacles as the measure of growth. 2. aposymbiotic polyps of the anemone aiptasia pulchella reinfected with strains of symbiodinium microadriaticum isolated from the anemone aiptasia pulchella and the scyphozoan cassiopea xamachana grow as well as normal aiptasia polyps. 3. aposymbiotic aiptasia polyps reinfected with zooxa ... | 1979 | 36925 |
| toxinological studies of the venom from cassiopea xamachana nematocysts isolated by flow cytometry. | the tentacle epithelial tissue of cassiopea xamachana contains nematocysts and symbiotic algal particles. these two structures were dissociated, analyzed and sorted by flow cytometry. a simple separating method was developed utilizing the algal chlorophyll autofluorescence and the nematocysts' fluorescence after the uptake of fluorescent stains. a five-fold increase in mouse lethality; significantly more potent hemolytic and cytosensing activities; as well as a cleanup in the capillary electroph ... | 2001 | 11166675 |
| electrophysiological and hemolytic activity elicited by the venom of the jellyfish cassiopea xamachana. | in this study, we determined hemolysis activity in human and sheep erythrocytes, and characterized the electrical responses in xenopus oocyte membrane elicited by the venom of the jellyfish cassiopea xamachana (cx). the cx venom produced hemolysis in both species, being more potent on human red cells. the electrophysiological study showed that the cx venom elicited three different responses in the oocytes. one current was generated in all the oocytes tested and corresponded with a slow inward cu ... | 2001 | 11384717 |
| possible antitumoral effect of the crude venom of cassiopea xamachana (cnidaria: scyphozoa) on tumors of the central nervous system induced by n-ethyl-n-nitrosourea (enu) in rats. | | 2003 | 14699895 |
| toxicity and machrs binding activity of cassiopea xamachana venom from puerto rican coasts. | a separation of toxic components from the upside down jellyfish cassiopea xamachana (cx) was carried out to study their cytotoxic effects and examine whether these effects are combined with a binding activity to cell membrane receptors. nematocysts containing toxins were isolated from the autolysed tentacles, ruptured by sonication, and the crude venom (cxtx) was separated from the pellets by ultracentrifugation. for identifying its bioactive components, cxtx was fractionated by gel filtration c ... | 2005 | 15581689 |
| indomethacin reproducibly induces metamorphosis in cassiopea xamachana scyphistomae. | cassiopea xamachana jellyfish are an attractive model system to study metamorphosis and/or cnidarian-dinoflagellate symbiosis due to the ease of cultivation of their planula larvae and scyphistomae through their asexual cycle, in which the latter can bud new larvae and continue the cycle without differentiation into ephyrae. then, a subsequent induction of metamorphosis and full differentiation into ephyrae is believed to occur when the symbionts are acquired by the scyphistomae. although strobi ... | 2017 | 28265497 |
| a numerical study of the effects of bell pulsation dynamics and oral arms on the exchange currents generated by the upside-down jellyfish cassiopea xamachana. | mathematical and experimental studies of the flows generated by jellyfish have focused primarily on mechanisms of swimming. more recent work has also considered the fluid dynamics of feeding from currents generated during swimming. here we capitalize on the benthic lifestyle of the upside-down jellyfish (cassiopea xamachana) to explore the fluid dynamics of feeding uncoupled from swimming. a two-dimensional mathematical model is developed to capture the fundamental characteristics of the motion ... | 2011 | 21562179 |
| patterns of inorganic phosphate uptake in cassiopea xamachana: a bioindicator species. | nutrient levels in the nearshore waters of the florida keys have increased over the past few decades concomitant with a decline in the health of florida's reef system. phosphorus is a particular concern in the florida keys as it may be the limiting nutrient in nearshore waters. we demonstrate that the upside-down jellyfish, cassiopea xamachana, decreases its rate of phosphate uptake following exposure to elevated levels of dissolved inorganic phosphate. we also show that this subsequent suppress ... | 2006 | 16288929 |
| localization and quantification of carbonic anhydrase activity in the symbiotic scyphozoan cassiopea xamachana. | the relationship between density and location of zooxanthellae and levels of carbonic anhydrase (ca) activity was examined in cassiopea xamachana. in freshly collected symbiotic animals, high densities of zooxanthellae corresponded with high levels of ca activity in host bell and oral arm tissues. bleaching resulted in a significant loss of zooxanthellae and ca activity. recolonization resulted in full restoration of zooxanthellar densities but only partial restoration of ca activity. high level ... | 2003 | 12807705 |
| an endogenous peptide is involved in internal control of metamorphosis in the marine invertebrate cassiopea xamachana (cnidaria: scyphozoa). | in the metagenetic life-cycle of the scyphozoan cassiopea xamachana metamorphosis of planula-larvae or larva-like buds to polyps is triggered by specific external cues which are transmitted inside the larva or bud where internal signals finally coordinate the initiation of metamorphosis. this study deals with an endogenous metamorphosis inducer present in planulae and buds of cassiopea. the inductive cue is localized in the basal part of the buds and can be characterized as a peptide with an app ... | 2003 | 12632179 |
| large-subunit ribosomal rna systematics of symbiotic dinoflagellates: morphology does not recapitulate phylogeny. | biochemical, histological, physiological, and genetic evidence indicates that dinoflagellates symbiotic with marine invertebrates are a heterogeneous complex of taxa, representing at least five genera in three orders. despite a wealth of data regarding morphological, biochemical, and behavioral differences among symbiotic dinoflagellates, knowledge concerning patterns of diversification is limited. i analyzed approximately 900 bp of the 5' end of the large-subunit ribosomal rna gene from 14 dino ... | 1998 | 10051396 |
| on the composition of the medusa, cassiopea xamachana and the changes in it after starvation. | | 1917 | 16586679 |
| the influence of the marginal sense organs on metabolic activity in cassiopea xamachana bigelow. | | 1916 | 16586665 |
| the influence of the marginal sense organs on functional activity in cassiopea xamachana. | | 1915 | 16576085 |