Results 181 to 190 of about 1,653 (200)

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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Hypercalcified demosponges and the end-Permian extinction

Global and Planetary Change, 2010
Abstract The hypothesis is presented here that the hypercalcified demosponges, characterized by a solid, largely external skeleton of spherulitic aragonite, or of high-Mg calcite, had symbiotic cyanobacteria, from the outset of their existence, that enabled them to precipitate their peculiar skeleton, and that both the skeleton and the cyanobacteria ...
openaire   +1 more source

Diversité des demosponges tunisiennes

2006
مراجعة الدّراسات المتعلّقة بالنظام الإسفنجي من ناحية وبالأنظمة البحريّة القاعيّة وغيرها الّتي تهتمّ ببيان التنوّع البيولوجي البحري التونسي من ناحية أخرى، مكّنتنا من تصنيف 143 نوع من الإسفنج (ديموسينج) لها توزيع مختلف حسب الجهات الشماليّة والشرقيّة والجنوبيّة للبلاد التونسيّة.
Ben Mustapha, K., Zarrouk, S, Souissi, A., El Abed, A.   +3 more
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Cyathophycus and the origin of demosponges

Lethaia, 2003
The relationships between the poriferan classes are currently obscure. Molecular phylogenies appear to be reaching a consensus that the hexactinellids and demosponges are closely related, despite previous attempts to separate the Hexactinellida from other sponges on cytological grounds, but the details of the transition are unknown.
openaire   +1 more source

Design for large-scale maricultures of the Mediterranean demosponge Chondrosia reniformis Nardo, 1847 for collagen production

Aquaculture, 2022
Mert Gökalp, Tim Wijgerde, Albertinka J Murk   +2 more
exaly  

Machine Learning Applications of Convolutional Neural Networks and Unet Architecture to Predict and Classify Demosponge Behavior

Water (Switzerland), 2021
Warren J Gallin, Simone Marini, Sally P Leys   +2 more
exaly  

Non-Spicular Biomineralization in Calcified Demosponges

1991
The sponges occupy an unusual evolutionary position as the most primitive of metazoans. However, despite their relatively small number of cell types they have evolved a considerable array of morphological forms and have evolved into a variety of ecological habitats.
openaire   +1 more source

Seasonal variability of prooxidant pressure and antioxidant adaptation to symbiosis in the Mediterranean demosponge Petrosia ficiformis

Marine Ecology - Progress Series, 2004
Francesco Regoli, Carlo Cerrano, Mariachiara Chiantore   +2 more
exaly  

Demosponge distribution in the eastern Mediterranean: a NW–SE gradient

Helgoland Marine Research, 2005
Eleni Voultsiadou
exaly  

Questioning the microbial origin of automicrite in Ordovician calathid–demosponge carbonate mounds

Sedimentology, 2018
Yuefeng Shen, Fritz Neuweiler
exaly