Results 211 to 220 of about 3,826 (235)

Genetic data confirms the enigmatic demosponge Janulum as haplosclerid

Zootaxa, 2023
Historically, sponge classification is based on the interpretation of morphological characters, whose phylogenetic information content is frequently limited, subject to homoplasies, or prone to environmental plasticity (e.g., Chombard et al. 1998). Therefore, the currently accepted order-level classification of its largest class, Demospongiae, has been
DIRK ERPENBECK, ROB W.M. VAN SOEST, GERT WÖRHEIDE, MICHELLE KELLY   +3 more
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Growth Dynamics in Four Mediterranean Demosponges

Estuarine, Coastal and Shelf Science, 2001
Growth dynamics of the demosponges Crambe crambe, Hemimycale columella, Oscarella lobularis and Chondrosia reniformis were studied in the north-western Mediterranean over a 2 year period. Independent growth and shrinkage rates were quantified for first time by a newly developed photographic and computer-assisted image analysis.
J. Garrabou, M. Zabala
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MicroRNA expression during demosponge dissociation, reaggregation, and differentiation and a evolutionarily conserved demosponge miRNA expression profile

Development Genes and Evolution, 2015
Demosponges share eight orthologous microRNAs (miRNAs), with none in common with Bilateria. Biological functions of these demosponge miRNAs are unknown. Bilaterian miRNAs are key regulators of cellular processes including cell cycle, differentiation, and metabolism.
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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
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Unifying Design Strategies in Demosponge and Hexactinellid Skeletal Systems

The Journal of Adhesion, 2010
Biological systems are well known for their ability to construct remarkably complex and mechanically robust skeletal structures from a great diversity of minerals. One such example, silica, is widely used in the synthesis of skeletal elements (spicules) within the phylum Porifera (the sponges).
Weaver, M., Milliron, G.W., Allen, P., Miserez, A., Rawal, A., Garay, J., Thurner, P.-J., Seto, J., Mayzel, B., Friesen, L.J., Chmelka, F., Fratzl, P., Aizenberg, J., Dauphin, Y., Kisailus, D., Morse, D.E.   +15 more
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New mechanisms in demosponge spicule formation

Journal of the Marine Biological Association of the United Kingdom, 2001
A new mechanism of demosponge spicule formation was recognized during taxonomic studies of bioeroding sponges (Porifera: Demospongiae: Clionidae). To date different spicule types have been explained by matching structures to their organic matrix, the axial thread. Bulbous structures, however, do not have an organic counterpart.
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A new fistulose demosponge species from the Persian Gulf

Zootaxa, 2018
During a scientific expedition to the Palinurus Rock, Persian Gulf, Iraq, a reef, which was discovered first in 2012, we found a new species which we tentatively assigned to Ciocalypta (Porifera, Demospongiae, Suberitida, Halichondriidae). Genetic results from different authors (Morrow & Cardenas, 2015, Redmond et al., 2013, Erpenbeck et al., 2012)
V, Gutekunst, A U, MÜller, T, Pohl, F, BrÜmmer, H, Malik, N, Fawzi, D, Erpenbeck, H, Lehnert   +7 more
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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
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Regeneration rates of a sublittoral demosponge

Journal of the Marine Biological Association of the United Kingdom, 2002
The effect of water flow rate on the regeneration rate of the temperate sponge Cliona celata was investigated at two sites experiencing fast and slight current flow respectively at Lough Hyne, Co. Cork, Ireland. Faster regeneration rates were found in sponges living in high current areas which may be due to an increased amount of potential food ...
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The GABAergic‐like system in the marine demosponge Chondrilla nucula

Microscopy Research and Technique, 2007
AbstractGamma‐amino butyric acid (GABA) is believed to be the principal inhibitory neurotransmitter in the mammalian central nervous system, a function that has been extended to a number of invertebrate systems. The presence of GABA in the marine demosponge Chondrilla nucula was verified using immunofluorescence detection and high‐pressure liquid ...
RAMOINO, PAOLA, GALLUS, LORENZO, PALUZZI S, RAITERI, LUCA, DIASPRO, ALBERTO GIOVANNI, FATO, MARCO MASSIMO, BONANNO, GIAMBATTISTA, TAGLIAFIERRO, GRAZIA, FERRETTI C, MANCONI R.   +9 more
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