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A recurrent blastogenetic cycle characterizes colonies of the ascidian Botryllus schlosseri. This cycle starts when a new zooid generation opens its siphons and ends with take-over, when adult zooids cease filtering and are progressively resorbed and replaced by a new generation of buds, reaching functional maturity. During the generation change, massive(More)
Using short-term hemocyte cultures of the colonial ascidian Botryllus schlosseri exposed to various sublethal concentrations of Diuron (3-(3,4-diclorophenyl)-1,1-dimethylurea) and TCMS pyridine (2,3,5,6-tetrachloro-4-(metylsulphonyl)pyridine), we evaluated their immunotoxic effects through a series of cytochemical assays previously used for organotin(More)
The supernatant from cultures of haemocytes of the compound ascidian Botryllus schlosseri incubated with zymosan (conditioned medium; CM) can enhance yeast phagocytosis by Botryllus blood cells. It contains molecules recognised by antibodies raised against the mammalian pro-inflammatory cytokines IL-1-alpha and TNF-alpha which appear as a single band of 60(More)
In the ascidian Botryllus schlosseri, we studied the effects of hemocyte incubation with foreign cells, such as bacteria, bacterial spores and yeast. In the presence of yeast and bacterial spores, morula cells, a common cell type in botryllid ascidians, changed their morphology, release phenoloxidase in the medium, thus causing an increase in cytotoxicity,(More)
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