Download PDF by Prof. Dr. Francesco Pietra (auth.): A Secret World: Natural Products of Marine Life

By Prof. Dr. Francesco Pietra (auth.)

ISBN-10: 3034875312

ISBN-13: 9783034875318

ISBN-10: 3764323469

ISBN-13: 9783764323462

Underwater exploration is an engaging task as a result richness of sea lifestyles, the attractive shades, and the distinction with terrestrial existence. it may be performed via diving or snorkeling -today there's advantageous apparatus for diving and taking underwater photographs­ and, except being a resource of delight, it types the foundation of contemporary ecological and behavioral marine experiences. Diving is an emotional task. The silence of the submarine global, merely interrupted through respiring, has greater than as soon as evoked the monsters of the great stories of my early life. possibly simply because, even supposing a lot time has elapsed in view that then, I nonetheless have a youth's skill to guage every little thing for the fascination it conveys. in spite of the fact that, not more than that may be won from underwater watehing. i'm really not asserting that this can be destined to be a futile workout. Picasso watched sea urchins a lot within the related method whereas revealing their quintessence in his work on the citadel of Antibes. What I suggest is that at the present time marine lifestyles is also considered from the viewpoint of the typical items concerned. this information, next to Picasso's time, provides a lot to the general picture.

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Tidal zones are areas of stress that strongly influence the vegetation and the coastal distribution of invertebrates. The size of seaweeds spans from some tiny epiphytic or parasitic species, which measure a few millimeters in length, to giant brown seaweeds of the order Laminariales or Fucales (kelp) the ashes of which are used as a source of iodine. A 36 striking case is Macrocystis pyrifera, of American Pacific coasts, the arms of which extend to over 50 meters. With regard to algae even the coral reef is a peculiar environment.

In this way strontium salts precipitate as insoluble 48 alginates, which are not absorbed by the intestine and are thus removed from body fluids. This can be useful for preventing substitution of calcium in our bones by radioactive strontium released by nucIear plants or bombs. Prolonged treatment with alginates also results in the strontium fixed in the bones to be replaced with calcium as the result of the equilibrium between fixed and dissolved strontium salts. In this appealing scenario there are cIouds, however: to what extent are alginates also capable of removing the elements which are needed by the human body, such as iron?

A less polar analog predominates in wild G. toxicus, as recently found in a cooperative effort among 25 French and Japanese scientists and the molecular structure has been elucidated: it is similar to that of brevetoxin-B. DINOFLAGELLATES, SPONGES, AND WORMS: WHEN SYMBIOSIS IS USEFUL TO MEDIClNE Another toxie dinoflagellate of the third group, Prorocentrum lima, produces an antitumoral organic acid. This acid, whieh unfortunately is toxie for humans, was fIrst found in the sponge Halichondria okadai that grows in Japanese waters (other than in the sponge Halichondria melanodocia found in the Florida Keys) and was therefore called okadaic acid.

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A Secret World: Natural Products of Marine Life by Prof. Dr. Francesco Pietra (auth.)

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