frustule


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Related to frustule: diatom

frustule

[′frəs‚chül]
(invertebrate zoology)
The shell and protoplast of a diatom.
A nonciliated planulalike bud in some hydrozoans.
References in periodicals archive ?
The frustules are usually linear or lanceolate in both valve and girdle view, but some species are asymmetric along the apical axis in valve view.
Frustules cylindrical in girdle view, joined in short chains, frequently of two cells and rarely of three, four or eight cells, separated by short strutted processes.
The images show the complete frustule of a species of Thalassiosira in connective view (top), an external valve view of T.
can reposition themselves on top of accruing sedimentary material; and (3) the ability of diatoms to stabilize sediments by forming diatomaceous mats comprised of an interlacing network of siliceous frustules and mucilaginous secretions (e.
The same cells grown under different conditions can change the length of their spines and chains and even the shape of their frustule.
Examination of the frustules in the electron microscope (EM) is essential for identification of most species, as recognized since the first transmission and scanning electron microscopy studies of Thalassiosira respectively in the 1950s and 1960s (Helmcke and Krieger, 1953; 1954; Hasle, 1968).
30) Different strategies, including calcination processes and hot acid treatments, have been developed to remove impurities from frustules.
Among the algae, diatoms have the advantage of being easy to collect and store due to their hard frustules.
It has been shown that major reservoirs built on boreal rivers can hold 30% to 70% of their annual water discharge (Dynesius and Nilsson, 1994), which can significantly decrease dissolved Si concentrations in rivers by providing preconditions for enhanced diatom growth and sedimentation of diatom frustules, and subsequent burial in sediments behind dams (Conley et al.
Also silver bioaccumulations in epipelic diatom frustules of Yoncali Village (after discharge of mine) were significantly higher than uncontaminated stations (an average of 7 times).
Planktonic diatoms contribute frustules to the sediment in deep open-water areas, while periphytic diatoms are primarily associated with shallower littoral habitats closer to shores (Wolin & Duthie 1999).
The finding of unbroken diatom frustules does not mean that the cell is intact, because digestive enzymes may penetrate the cell through the valve pores and digest its contents, which may or may not leak into the gut.