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

By Prof. Dr. Francesco Pietra (auth.)

Underwater exploration is an interesting job as a result richness of sea lifestyles, the gorgeous colours, and the distinction with terrestrial lifestyles. it may be performed by means of diving or snorkeling -today there's effective gear for diving and taking underwater photographs­ and, except being a resource of delight, it kinds the foundation of contemporary ecological and behavioral marine experiences. Diving is an emotional job. The silence of the submarine global, basically interrupted via respiring, has greater than as soon as evoked the monsters of the awesome stories of my formative years. probably simply because, even if a lot time has elapsed given that then, I nonetheless have a youth's skill to guage every thing for the fascination it conveys. besides the fact that, not more than that may be won from underwater watehing. it's not that i am announcing that this can be destined to be a futile workout. Picasso watched sea urchins a lot within the comparable method whereas revealing their quintessence in his work on the fortress of Antibes. What I suggest is that this present day marine existence is additionally considered from the point of view of the common items concerned. this data, next to Picasso's time, provides a lot to the general picture.

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Seagrasses are flowering plants which, together with many freshwater herbs and the palms belong to the dass Monocotyledonae. Despite a limited number of species, 48 in 12 genera, they have colonized nearly all sandy coastal areas. Marine emergent plants are higher plants which inhabit the intertidal shore. SEAWEEDS AND ZONATION OF COASTS AND OCEANS Seaweeds dorninate rocky areas and can also be found in sandy zones, provided that there are stones that are the support on which they grow. Epiphytic or parasitic species, which are very common, grow on seagrasses or on other seaweeds.

Eating seaweeds, particularly brown seaweeds 38 which contain large arnounts of iodides, can relieve the problem of endemie goitre, which is a disorder that stilI affects a large part of the population in such areas. SEAWEEDS AND WORLD POLLUTION Common species of seaweeds, belonging 10 all three divisions, release small halogenated hydrocarbons identical or similar to typical industrial pollutants. The seaweeds responsible belong to the genera Fucus (serrated-, flat-, and bladder-wrack) and Ascophyllum (knotted-wrack) in the brown, Gigartina and Asparagopsis in the red, and Enteromorpha (green weed) and Ulva (sea lettuce) in the green seaweeds.

However, the presence of prostaglandins in a vegetable, like Gracilaria, was unprecedented. AGAR-AGAR AND OTHER POLYMERS OF THE RED SEAWEEDS: THE SECOND COMPONENT OF THE BIG BUSINESS Most polysaccharides extracted from red seaweeds form gelatins which are called phycocolloids and are used by the food, cosmetic, and pharmaceutical industry. They 41 are mainly used as emulsifying, binding, suspending, and thickening agents, but also as degradable vehicles for drugs. They are also used in the leather, paper, and textile industry, and as a substrate for growing microorganisms.

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