Showing papers on "Holothuria published in 1989"
TL;DR: The finding that brown masses are positive to Schmorl's reaction, suggesting a possible melanin presence is of interest and the coelomocyte lysates are also able to oxidize DOPA, an intermediate product of one melanin synthesis pathway.
52 citations
TL;DR: In this paper, desulfated lanostane-type triterpene tetraglycosides, designated DS-pervicoside A (7), DS-PERVOSIDE B (8), and DS- PERVOCOSIDE C (9), have antifungal activity, and their structures were determined on the basis of chemical and physicochemical evidence.
Abstract: Triterpene-oligoglycoside constituents, contained in the body walls and the Cuvierian tubules f the sea cucumber Holothuria pervicax (torafu-namako in Japanese), were investigated and purified in their desulfated forms. These desulfated lanostane-type triterpene tetraglycosides, designated DS-pervicoside A (7), DS-pervicoside B (8), and DS-pervicoside C (9), have antifungal activity, and their structures were determined on the basis of chemical and physicochemical evidence. The parent oligoglycosides of these desulfated tetraglycosides, named pervicosides A (10), B (11), and C (12), were shown to be the 4'-sulfates of DS-pervicosides A (7), B (8), and C (9), respectively.
31 citations
TL;DR: Progenitor cells lacking elaborate cytoplasmic specialization and with a probable staminal function are also normal circulating coelomocytes of Holothuria polii.
Abstract: The ultrastructure of Holothuria polii coelomocytes is described and related to cell functions. Amebocytes, spherule cells and progenitor cells are the major circulating cellular types. Two morphological phases (bladder and filipodial) of the amebocytes are distinguished. Type I and Type II spherule cells are described on the basis of the morphological and ultrastructural characteristics of their granules. Maturative stages of these cells are also observed. Probably a third type of spherule cell is present. It could correspond to the acidophilic and Schmorl's positive cells. Progenitor cells lacking elaborate cytoplasmic specialization and with a probable staminal function are also normal circulating coelomocytes of Holothuria polii.
25 citations
TL;DR: The Holothuria polii Polian vesicles are organs of inflammatory responsiveness that are able to produce brown bodies that represent a survival strategy, used by the holothuroid, to rid the body of non-self material presented to it.
11 citations
TL;DR: A highly reiterated sequence in the sperm DNA of the echinoderm Holothuria tubulosa has been isolated by digestion with EcoRI, and cloned in the phagemid Bluescript.
9 citations