New PDF release: Aspects of Sponge Biology

By Frederick W. Harrison

ISBN-10: 012327950X

ISBN-13: 9780123279507

Show description

Read Online or Download Aspects of Sponge Biology PDF

Similar biology books

Evolution-adjusted Tumor Pathophysiology:: The Novel by Albrecht Reichle (auth.), Albrecht Reichle (eds.) PDF

Mixed modularized treatments for metastatic melanoma are pointing to critical difficulties of verbal exchange between ‘systems participators’. A conversation concept explains 'social engineering', endogenously brought on or through imposing non-normative boundary stipulations. Evolution-adjusted tumor pathophysiology is borne through an evolution concept, which contrasts narrative evolution histories.

Evolutionary Biology of Primitive Fishes by Carl Gans (auth.), R. E. Foreman, A. Gorbman, J. M. Dodd, R. PDF

What, accurately, is a primitive fish? such a lot biologists could agree that the dwelling cyclostomes, selachians, crossopterygians, and so forth. can't be thought of really primitive. although, they and the fossil list have served to supply the knowledge which varieties the foundation for hypothesis about the nature of the unique vertebrates.

Roland Bilang, Andreas Klöti, Martin Schrott, Ingo Potrykus's Plant Molecular Biology Manual PDF

5 years in the past, the 1st version of the Plant Molecular Biology handbook seemed. at the moment, the editors felt that the sector of plant molecular biology had matured to some extent that the e-book of a sequence of protocols in plant molecular biology was once warranted. up to now 5 years, the sphere of plant molecular biology has elevated quickly.

Oscillation and Stability of Delay Models in Biology by Ravi P. Agarwal, Donal O'Regan, Samir H. Saker PDF

Environmental version performs a tremendous function in lots of organic and ecological dynamical platforms. This monograph specializes in the learn of oscillation and the soundness of hold up versions happening in biology. The ebook provides fresh study effects at the qualitative habit of mathematical versions less than varied actual and environmental stipulations, overlaying dynamics together with the distribution and intake of nutrition.

Extra resources for Aspects of Sponge Biology

Example text

In micrographs of mature sponge silica40 ASPECTS OF SPONGE BIOLOGY blasts, even with the Golgi apparatus showing, I have not seen the typical silicon electron density, but I have never been lucky enough to have an immature silicablast in the section. If Lesquereusia spiralis can be used as any refer­ ence, we can expect Golgi involvement in elaboration of sili­ con in sponges. SIMPSON: There is, however, a major area of difference among the ameboid forms, the algae, and the diatoms. In sponges there is a whole membrane system which develops, the silicalemma.

The very young microscleres of Spongilla lacustris normally have a small central swelling. Occasion­ ally immature megascleres do also. Some microscleres, even when they are a normal 120 to 130 y in length, may show a small swelling. This probably indicates that in the microsclere, in terms of balance, the membrane is slightly ahead of the filament. There is no place for the silicon to go in a smooth geometric pattern, so it piles up to some extent. POIRRIER: It is a beautiful explanation for what I have seen—even with the infolding.

The West Indian haplosclerid "Callyspongia" plicifera varies from pink to purple, orange, and blue. Its color in life is made even more remarkable by its iridescence or luminescence, a property which is absent in other West Indian sponges of this genus. Haliclona aquaeductus is also strikingly polychromous. The color variants reported by Italian authors for populations of the Mediter­ ranean (greyish and yellowish white, drab, pink, brownish orange) complement those which I observed in the Bahamas (pinkish lavender to purple, drab, olive, greyish).

Download PDF sample

Aspects of Sponge Biology by Frederick W. Harrison


by William
4.4

Rated 4.94 of 5 – based on 33 votes