Kinetic and Morphological Aspects of Particle Ingestion by the Freshwater Sponge Ephydatia Fluviatilis L.

Willenz, Ph.

doi:10.1016/b978-0-08-025904-8.50017-1

Cited by 18 publications

(17 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Employing bacteria and soluble protein, Weissenfels (1976) has found substantially the same results using transmission electron microscopy (Figs. 6-23, 6-24) and Willenz (1980) using latex beads (of about 0.8 /Lm diameter) and transmission electron microscopy has shown entrapment by choanocytes and exopinacocytes (Fig. 6-25) (Table 6-13).…”

Section: Retention Of Particulatesmentioning

confidence: 97%

“…At the base of the collar, cytoplasmic contractile vacuoles are present in freshwater species (see later). Phagosomes are also a constituent of the choanocyte cytoplasm (Brill, 1973;Connes et at., 1972;Pottu-Boumendil, 1975;Weissenfels, 1976;Ledger, 1976;Willenz, 1980) and acid phosphatase activity has been demonstrated in them in Corvomeyenia carolinensis (Harrison, 1974b). The choanocyte nucleus is generally anucleolate (light microscope level) except in nonsphinctozoid calcareous species (Ledger, 1976), in homoscleromorphs (Donadey, 1978(Donadey, , 1979, in hexactinellids (Reiswig, 1979), and under special conditions in other demosponges (Chaps.…”

Section: Choanocytes (Excluding Hexactinellids)mentioning

confidence: 98%

“…A strange "fusion" (f) of intravacuolar beads occurs in some cells. Archeocytes (a) have also taken up the beads by this time through transfer from the choanocytes (see D.) (x 1,045) (Willenz, 1980). B. Twelve hours after feeding, a bead is exocytised (e) to the mesohyl from a choanocyte (x8,370) (Willenz, 1980).…”

Section: Retention Of Particulatesmentioning

confidence: 99%

“…Archeocytes (a) have also taken up the beads by this time through transfer from the choanocytes (see D.) (x 1,045) (Willenz, 1980). B. Twelve hours after feeding, a bead is exocytised (e) to the mesohyl from a choanocyte (x8,370) (Willenz, 1980). C. Very soon after exposure to the beads (40 min) pinacocytes in the dermal membrane ingest them (b) (Xll,180) (Willenz, 1980).…”

Section: Retention Of Particulatesmentioning

confidence: 99%

“…B. Twelve hours after feeding, a bead is exocytised (e) to the mesohyl from a choanocyte (x8,370) (Willenz, 1980). C. Very soon after exposure to the beads (40 min) pinacocytes in the dermal membrane ingest them (b) (Xll,180) (Willenz, 1980). D. Transfer of a bead (b) from a choanocyte (c) to an archeocyte (a) 2 h following feeding (x6,21O) (Willenz, 1980 Consequently, such particles can be directly ingested by archeocytes as is the case when they pass through the porocytes lining the incurrent canals and directly enter the mesohyl.…”

Section: Retention Of Particulatesmentioning

confidence: 99%

See 4 more Smart Citations

The Cell Biology of Sponges

Simpson

1984

695

604

View full text Add to dashboard Cite

PrefaceThe writing of this work was stimulated by discussions with colleagues in the fields of biochemistry, developmental biology, and physiology who expressed their, and other's, need for a current, critical review and analysis of sponge cell biology, and secondly by my own conviction that the field of sponge biology in general could benefit from such a synthesis and evaluation of the data. The major problem faced in writing this book was that of balancing the text relative to presenting, on the one hand, a review of the data and, on the other hand, a synthesis of it. A vigorous attempt has been made to be as uniform as possible in reviewing data but this, of course, is not always possible because some papers stand out as key advances in one or more areas. To the extent that it has been feasible to synthesize specific perspectives or to emphasize deficiencies in knowledge, these have been done. A major effort is made to review cellular structure per se since this has not previously been attempted. Some speculations are also to be found and these, hopefully, will not only stimulate new investigations but will also serve as respites from the unavoidable rigidity of data review. Much effort has been expended to avoid errors, although it is probably not possible in an undertaking of this scope to finally arrive at an error-free state. For such of those that do occur by omission or otherwise, I take full and sole responsibility.There are a number of important, recent monographs and symposial volumes which contain much information on sponge cell biology as well as other topics. Outstanding among them is Biologie des Spongiaires (C. Levi and N. Boury-Esnault, Eds., 1979. Editions de CNRS, Paris).

show abstract

Section: Retention Of Particulatesmentioning

confidence: 97%

Section: Choanocytes (Excluding Hexactinellids)mentioning

confidence: 98%

Section: Retention Of Particulatesmentioning

confidence: 99%

Section: Retention Of Particulatesmentioning

confidence: 99%

Section: Retention Of Particulatesmentioning

confidence: 99%

See 3 more Smart Citations

The Cell Biology of Sponges

Simpson

1984

695

604

View full text Add to dashboard Cite

show abstract

Sponge dermal membrane morphology: Histology of cell‐mediated particle transport during skeletal growth

Teragawa

1986

Journal of Morphology

View full text Add to dashboard Cite

The keratose demosponge, Dysidea etheria, secretes a skeletal network of interconnecting spongin fibers and incorporates sand grains and other foreign particles into the fibers. Previous studies showed that foreign particles enhanced fiber growth and increased the stiffness of skeletal fibers. The present study uses light and electron microscopy to study the mechanism of particle incorporation. These histological observations show that particles become engulfed into thickened regions of the mesohyl of the dermal membrane, whereupon ameboid cells contact particles and secrete an electron dense layer of extracellular material onto the particle surface. Within several days, particles are moved towards primary skeletal fibers located at cone-shaped protuberances on the sponge surface called conules. Particles accumulate at conules and are consolidated by secretion of spongin at the growing fiber apices. The observations suggest that coordinated migration of groups of mesohyl cells control particle transport to conules and that patterns of cell migration are associated with the structural organization of the dermal membrane. Particle transport may be homologous and analogous to spicule transport in other demosponges.

show abstract

Sponges (Porifera) and Sponge Microbes

Hoffmann

Schläppy

2011

Encyclopedia of Geobiology

View full text Add to dashboard Cite

Kinetic and Morphological Aspects of Particle Ingestion by the Freshwater Sponge Ephydatia Fluviatilis L.

Cited by 18 publications

References 13 publications

The Cell Biology of Sponges

The Cell Biology of Sponges

Sponge dermal membrane morphology: Histology of cell‐mediated particle transport during skeletal growth

Sponges (Porifera) and Sponge Microbes

Contact Info

Product

Resources

About