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Carnivore, astute e antibatteriche

In futuro si andrà a lezione di medicina dalle piante carnivore: nei fluidi che utilizzano per digerire gli insetti si nasconderebbero infatti alcuni enzimi in grado di debellare funghi e batteri. Per oltre un secolo i botanici si sono invano scervellati per cercare di carpire i segreti della digestione di questi vegetali. Ora due scienziati giapponesi sembrano aver svelato il mistero: dopo aver coltivato alcune piante carnivore in laboratorio, sono riusciti a identificare sette proteine present in their digestive fluid - an acid that kills the insects that fall rapidly within the organ responsible for digestion. But then discover that some of these enzymes are not at all to break down the prey, but to preserve them. A contradiction? No, if we think that these plants consume their food very slowly. In the meantime, need to fight the bacteria that take root and feast on insects, robbing the plant the better part of the meal. That's why the carnivorous develop proteins that bring ko bacteria and fungi, and keep longer than the prey. "These enzymes may be valuable to prevent bacterial and fungal infections," says Tatsuro Hamada, co-author of the discovery, "But further research is needed before they can be fully exploited in medicine and agriculture ( photo: Dionaea muscipula ). [ EI ]

Environmental Sciences

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Come combatere e atttuare la disinfestazione per la processionaria dei pini?



Processionary pine: their hair causes serious problems to humans, but can be removed using ecological methods.
processionary The pine is a moth. The caterpillars, which is the stage of development preceding that of an adult, have thick hair that falls easily spread in the environment and causing inflammatory reactions in humans and animals particularly particularly great when the hairs come into contact with the respiratory system. The most natural and effective pest control is to treat infested trees with Bacillus thuringiensis, a microorganism processionary harmful to larvae but harmless to humans and other ecosystem components. The best time for treatment is the autumn, before the larvae are terminated in the nests. Hopefully you can then disconnect from the trees the nests of insects survived, thus preventing the complete life cycle, producing new adults the following spring. Since the presence of male signals occurred in an indirect way the coupling and therefore the presence of new larvae that may be harmful during the summer are used to capture sex pheromone traps (natural substances that attract the males). Treatment with Bacillus thuringiensis is done about three weeks after the capture of the male.

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