Gandacii de bucatarie pot sintetiza betacarotenul
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Cercetatorii de la Institutul Secenov de biochimie si fiziologie a evolutiei din Sankt Petersburg au demonstrat ca gandacii rosii de bucatarie sunt capabili sa sintetizeze betacarotenul, substanta
Cercetatorii de la Institutul Secenov de biochimie si fiziologie a evolutiei din Sankt Petersburg au demonstrat ca gandacii rosii de bucatarie sunt capabili sa sintetizeze betacarotenul, substanta indispensabila in buna functionare a sistemului vizual. Or, o asemenea capacitate nu a fost pana acum nicicand identificata la vreo vietuitoare. Timp de trei ani, ei au studiat doua loturi de gandaci: unul caruia i s-a administrat un supliment de suc de morcovi si altul supus unui regim alimentar deficitar in ce priveste carotenul. Primul lot a prezentat o concentratie de caroten de zece ori mai mare decat nivelul normal, ceea ce denota capacitatea de a stoca aceasta substanta. Gandacii din a caror alimentatie a lipsit carotenul nu au orbit, cum s-ar fi putut presupune. Dimpotriva, dupa ce le-au injectat un precursor radioactiv al betacarotenului, cercetatorii rusi au constatat ca gandacii respectivi pot sintetiza propriul lor caroten printr-un mecanism ce nu a putut fi, deocamdata, descifrat. Sa fie datorata exceptionala mobilitate a gandacilor rosii de bucatarie, cand sunt expusi la lumina, acestei capacitati unice?
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