By Marcel Florkin
Chemical Zoology, quantity II: Porifera, Coelenterata, and Platyhelminthes provides chemical details on zoological importance. This booklet is equipped into 3 sections; each one part offers with the organic and biochemical points of the categorical phylum.
The first part examines 3 huge periods of Porifera, specifically, Calcarea, Demospongiae, and Hexactinellida. It describes the skeletal constitution, pigments, food, digestion, composition, middleman metabolism, and hibernation of Porifera. the second one part covers the class, pigments, feeding reaction, digestion, meals, ecology, pharmacology, and middleman metabolism of Coelenterata. The final part is dedicated to the type, meals, digestion, breathing and middleman metabolism, development, improvement, and tradition equipment, in addition to the chemical features of ecology of Platyhelminthes.
This publication is a useful source for zoologists and biochemists.
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The electron microscope has afforded new proofs of this: Levi and Porte (1962) and Levi and Levi (1965) observed them in several species, and even in young freeswimming larvae. W e do not, at the present, know anything of the metabolic relation between symbiotic bacteria and sponges. C. TECHNICAL IMPLICATIONS OF THE EXISTENCE OF SYMBIONTS Whereas a few years ago the spongillids were classically cited as the example of symbiotic sponges, evidence is now piling up that their case is far from isolated and that a great many species of sponges probably are hosts to a rather wide variety of symbionts.
Here again there are surprises: the Bermuda species L. isodyctialis has an acylsphingomyelin phosphatidic acid in which the major fatty acids are palmitate and palmitoleate, and the Long Island Sound species S. vesparia has an aldehydogenic lecithin or plasmalogen, with a relatively high proportion of unsaturated acids. Inositol, a com ponent of some phosphatides, has been found in Geodia gigas (Acker mann and List, 1959), and sulfolipid was identified in Polymastia sp. (Soper, 1963). 2. Sterols In all, nine different sterols have been isolated from sponge tissues and sufficiently characterized to deserve names, which in several in stances are derived from the genus in which the sterol was first found.