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Spicules

Finally, other properties of asbestos fibers may be evaluated depending on the envisaged appHcation. Typically, the grits and spicule content, the magnetic susceptibiUty (magnetic rating), the content in soluble chlorides, and the humidity level may be of a particular interest in specific appHcations. [Pg.354]

Fig. 5. Spiculed red blood cells (echinocyte) in peripheral blood smear of a splenectomized patient with pyruvate kinase deficiency. Fig. 5. Spiculed red blood cells (echinocyte) in peripheral blood smear of a splenectomized patient with pyruvate kinase deficiency.
Ascidians (Tunicates) are a class of marine organisms (including sea squirts), which have a characteristic tough covering, called a tunic. The tunic is composed of cellulose and contains small calcium-containing spicules in a wide variety of shapes (Figure 19.8) ... [Pg.331]

Figure 19.8 Scanning electron micrographs of spicules from the tunicate P.pachydermatina (a) Dogbone spicule from the tunic, (b) Antler spicule from the branchial sac. (From Wilt, 2005. Copyright 2005, with permission from Elsevier). Figure 19.8 Scanning electron micrographs of spicules from the tunicate P.pachydermatina (a) Dogbone spicule from the tunic, (b) Antler spicule from the branchial sac. (From Wilt, 2005. Copyright 2005, with permission from Elsevier).
Spicules Minute, needle-Uke spines produced by some of the microorganisms that deposit calcareous and/or siliceous hard parts. [Pg.889]

Most carnivorous animals avoid sponges as they are of poor nutritional value and are protected by spicules and toxins. Many sea sponges use toxins to repel would-be predators. Some nudibranchs, however, such as Platydoris... [Pg.129]

Proteins papain/cathepsin-L protease fonily (Mar spicules of Tethya aurantia, Porif. from California Shimizu 1998 Land kidney of Mamm. and tropical fruits of Ang. MI). [Pg.74]

Among the organs of living things consisting of calcite, the spicules of sea urchins and the exo-skeleton of coccolithophores attract particular interest. A sea... [Pg.269]

There is no doubt that the Habitus of calcite crystals forming the exo-skeleton of coccoliths is designed naturally to match the function of spicules, but further investigation may be required to explain the growth mechanism of this peculiar form and the relations between R and V crystals. [Pg.272]

Uriz, M., Turon, X., Becerro, M. A., and Agell, G. (2003). Siliceous spicules and skeleton frameworks in sponges Origin, diversity, ultrastructural patterns, and biological functions. Microsc. Res. Tech. 62, 279-299. [Pg.152]

I Small marine sponges with calcareous spicules and large collar cells mostly under two cm. in length. [Pg.18]

II Usually larger sponges with silicious spicules or spongin fibres or both spicules and fibres present. [Pg.18]

Silicious spicules present, either with or without spongin fibres. [Pg.19]

Without triaxonid spicules skeleton of silicious spicules with or without spongin fibres.Order Tetraxonida (Monaxonida, Tetractinellida)... [Pg.19]

With triaxonid, characteristically hexactinellid spicules.Order Hexactinellida... [Pg.19]

Spicule Skeletal structures of various shapes, composed of carbonate of lime or silicon, which are found in many of the groups of sponges. [Pg.40]


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Biosilica The enzymatically formed scaffold of siliceous sponge spicules

Sea urchins spicules

Silicified spicules

Spicule assemblage, sponge

Sponges spicules

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