Članak donosi teorijski model za projektiranje mekih pneubotskih konstrukcija koje se mogu konstruirati i pokretati koristeći jedinični modularni volumenski element. Analizom konstrukcije mekih ...robota, pneumatski prilagodljivih i reagirajućih konstrukcija te umjetničkih instalacija, dobiven je set od četiriju osnovnih tipova tjelesnih nacrta kao apstraktnih izraza za projektiranje složenih modularnih pneubotskih konstrukcija u arhitekturi.
Unatoč dugogodišnjem istraživanju i upotrebi zamjenskih koštanih materijala, prirodni biomaterijali i dalje pokazuju najbolje rezultate. Uzimajući u obzir da kosti kralješnjaka kao zamjenski ...materijal predstavljaju potencijalni izvor zaraze, istraživači ispituju i druge biominerale manje srodnih organizama. Istraživanja provedena na morskim beskralješnjacima dovela su do razvoja i aplikacije implantata kao što je to Pro Osteon® ili Algipore®, koji postižu dobre kliničke rezultate. U ovom radu dan je prikaz najpoznatijih materijala dobivenih iz morskih organizama koji se već koriste u kliničkoj medicini ili imaju dobar potencijal za upotrebu. Navedene su i dodatne mogućnosti istraživanja morskih organizama u proučavanju patoloških procesa biomineralizacije u ljudskom organizmu.
•Mn-porphine was immobilized onto imidazole- and pyridine-grafted supports.•The two ligands caused significant differences in catalytic activity.•Pyridine-immobilized metalloporphine was more ...reactive than imidazole-counterpart.•Imidazole-immobilized metalloporphine was more stable.•Different catalytic mechanisms were suggested.
This paper describes the immobilization of 5,10,15,20-tetrakis(2,6-dichlorophenyl)porphine-manganese(III) through coordinative bond onto imidazolyl- and pyridyl-grafted silica, emulating the active site of ligninolytic peroxidases. To this purpose, plain silica gel was functionalized with two organosilanes: the first bearing an imidazolyl functionality, the other one bearing a pyridyl functionality. Manganese-porphine was then immobilized onto the two modified silicas. The two catalytic adducts have been fully characterized to point out the effect of the ligands on their catalytic features. Pyridine-immobilized metalloporphine was found to be a much more performant catalyst, giving significantly higher conversion rates with all the tested substrates: a lignin-model compound such as veratryl alcohol, the lignin peroxidase well-known substrate azure B, and recalcitrant textile dyes such as alizarin red S, phenosafranine, methylene blue, methyl green, xylenol orange, and methyl orange. Imidazole-immobilized metalloporphine on the contrary has proved to be more stable than its pyridine-based counterpart. Besides, the ligands seem to promote different catalytic pathways in the two adducts. These results allow giving rational and rigorous insights about the effect of the ligands during the immobilization of metalloporphines, thus helping in the design of catalysts with specific feature (i.e. stability, reactivity).
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