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Download e-book for iPad: A Secret World: Natural Products of Marine Life by Prof. Dr. Francesco Pietra (auth.)

By Prof. Dr. Francesco Pietra (auth.)

ISBN-10: 3034875312

ISBN-13: 9783034875318

ISBN-10: 3764323469

ISBN-13: 9783764323462

Underwater exploration is an interesting task as a result richness of sea existence, the gorgeous shades, and the distinction with terrestrial lifestyles. it may be performed by way of diving or snorkeling -today there's high quality gear for diving and taking underwater images­ and, except being a resource of delight, it kinds the foundation of recent ecological and behavioral marine reports. Diving is an emotional job. The silence of the submarine international, basically interrupted via respiring, has greater than as soon as evoked the monsters of the terrific stories of my formative years. probably simply because, even supposing a lot time has elapsed due to the fact then, I nonetheless have a youth's skill to guage every thing for the fascination it conveys. even if, not more than that may be received from underwater watehing. it's not that i am announcing that this is often destined to be a futile workout. Picasso watched sea urchins a lot within the comparable manner whereas revealing their quintessence in his work on the fortress of Antibes. What I suggest is that this present day marine existence is also considered from the viewpoint of the traditional items concerned. this information, next to Picasso's time, provides a lot to the final picture.

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CeIlular extracts taken at regular intervals from G. polyhedra revealed that the concentrations of luciferin, the light-active compound, and luciferase, the light-inducing enzyme, are higher during the night than during the day. Precise contro! of the enzyme activity and, in consequence, of light emission is probably exerted by a regulatory metabolite, which is released in tiny amounts from ceIl organelles of the dinoflageIlate for a certain period and then switched off for the next period when it is no more needed.

Brevetoxins are structurally quite different from gonyautoxins, lacking any salt-like charaeter in particular, and affect cellular membrane channels which are needed to import food. Brevetoxins are acetogenins, but are far more eomplex in structure than EPA and vegetable oils. The problem of detecting brevetoxins at the subtrace level with which they oceur in fish and mollusks is a serious one as normal methods of analytical chernistry are not sensitive enough. However, in combining this with biological methods a solution has been offered to this problem: tritium-labeled radioaetive precursors are fed to G.

These compounds are called phytoalexins, a word derived from ancient Greek to mean "warding-off". Water-soluble polysaccharides containing sulfate groups can also be extracted from green seaweeds but have no marke!. Seen from a medical point of view there is nothing particular that merits discussion with the green seaweeds eitheT. MEMORY EFFECT IN HIGHER PLANTS Higher plants originated from green seaweeds and it should not be surprising that there are natural products which are common to both groups of vegetables.

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


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