Results 161 to 170 of about 1,653 (200)

Corallistin A, a second example of a free porphyrin from a living organism. Isolation from the demospongeCorallistes sp. of the coral see and inhibition of abnormal cells

Helvetica Chimica Acta, 1989
It is shown that the demosponge #Corallistes$ sp. (#Tetractinomorpha$, #Lithistida$, #Corallistidae$) collected in the Coral Sea, contains corallistin A, the second example, of a free porphyrin from a living organism.
Michele D’Ambrosio, Antonio Guerriero, Cecile Debitus   +2 more
exaly   +2 more sources

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Nanostructural features of demosponge biosilica

Journal of Structural Biology, 2003
Recent interest in the optical and mechanical properties of silica structures made by living sponges, and the possibility of harnessing these mechanisms for the synthesis of advanced materials and devices, motivate our investigation of the nanoscale structure of these remarkable biomaterials. Scanning electron and atomic force microscopic (SEM and AFM)
James C, Weaver, Lía I, Pietrasanta, Niklas, Hedin, Bradley F, Chmelka, Paul K, Hansma, Daniel E, Morse   +5 more
openaire   +2 more sources

Development in primary cell culture of demosponges

Journal of Biotechnology, 2003
We have established primary cell culture of the marine demosponge Dysidea avara and Suberites domuncula. Microbial contamination was controlled by the use of a pool of antibiotics confirming the goodness of this procedure. Effect of pH, temperature and light was studied to establish the better growth conditions.
De Rosa Salvatore, De Caro Salvatore, Iodice Carmine, Tommonaro Giuseppina, Stefanov Kamen, Popov Simeon   +5 more
openaire   +5 more sources

Silica Deposition in Demosponges

2003
Demosponges are the most widespread class of the phylum Porifera. They secrete siliceous (spicules) and proteinaceous (fibers) elements, which constitute the skeleton that shapes the sponge growth and allow cell organization and establishment of the aquiferous system through which the surrounding water accesses the internal cells.
Maria J, Uriz, Xavier, Turon, Mikel A, Becerro   +2 more
openaire   +2 more sources

Piwi expression in archeocytes and choanocytes in demosponges: insights into the stem cell system in demosponges

Evolution & Development, 2010
SUMMARY Little is known about the stem cells of organisms early in metazoan evolution. To characterize the stem cell system in demosponges, we identified Piwi homologs of a freshwater sponge, Ephydatia fluviatilis, as candidate stem cell (archeocyte) markers. EfPiwiA mRNA was expressed in cells with archeocyte cell morphological features.
Noriko, Funayama, Mikiko, Nakatsukasa, Kurato, Mohri, Yoshiki, Masuda, Kiyokazu, Agata   +4 more
openaire   +2 more sources

Comments on a skeleton design paradigm for a demosponge

Journal of Structural Biology, 2011
The ball-shaped marine sponge Cinachyrellalevantinensis is 3-5 cm in diameter. It filters large quantities of seawater for feeding. Sponges contain numerous, hydrated, brittle amorphous SiO₂ spicules of several types that form 70-80% by weight of the sponge. We performed mechanical tests to determine the functionality of the sponge skeleton.
Y, Aluma, M, Ilan, D, Sherman
openaire   +2 more sources

Embryogenesis and metamorphosis in a haplosclerid demosponge: gastrulation and transdifferentiation of larval ciliated cells to choanocytes

Invertebrate Biology, 2002
Early development and metamorphosis of Reniera sp., a haplosclerid demosponge, have been examined to determine how gastrulation occurs in this species, and whether there is an inversion of the primary germ layers at metamorphosis. Embryogenesis occurs by
Sally P Leys, Bernard M Degnan
exaly   +1 more source

Mesostructure from Hydration Gradients in Demosponge Biosilica

Chemistry – A European Journal, 2014
AbstractOrganisms of the phylum Porifera, that is, sponges, utilize enzymatic hydrolysis to concatenate bioavailable inorganic silicon to produce lightweight, strong, and often flexible skeletal elements called spicules. In their optical transparency, these remarkable biomaterials resemble fused silica, despite having been formed under ambient marine ...
James R, Neilson, Nathan C, George, Meredith M, Murr, Ram, Seshadri, Daniel E, Morse   +4 more
openaire   +2 more sources

Silica deposition in Demosponges: spiculogenesis in Crambe crambe

Cell and Tissue Research, 2000
Transmission electron-microscopy images coupled with dispersive X-ray analysis of the species Crambe crambe have provided information on the process of silica deposition in Demosponges. Sclerocytes (megasclerocytes) lie close to spicules or surround them at different stages of growth by means of long thin enveloping pseudopodia.
M J, Uriz, X, Turon, M A, Becerro
openaire   +2 more sources

Biomineralization in living hypercalcified demosponges: Toward a shared mechanism? [PDF]

Journal of Structural Biology, 2013
Massive skeletons of living hypercalcified sponges, representative organisms of basal Metazoa, are uncommon models to improve our knowledge on biomineralization mechanisms and their possible evolution through time. Eight living species belonging to various orders of Demospongiae were selected for a comparative mineralogical characterization of their ...
Gilis, M., Grauby, O., Willenz, P., Dubois, P., Heresanu, V., Baronnet, A.   +5 more
openaire   +3 more sources