The enzyme-dependent conjugates of indomethacin and amylose (Am-IND) were synthesized at room temperature using N,N'-dicyclohexylcarbodiimide (DCC) as a coupling agent and 4-(N,N'-dimethylamino) pyridine (DMAP) as a catalyst. Their structures were characterized by FTIR and (1)H NMR analyses, and the results indicated that the IND residues were conjugated with amylose backbones through ester bon...

This article proposes hybrid fiber-reinforced concrete (HFRC) mixed with polyvinyl alcohol fiber (PVA) and polypropylene steel (FST) as a wall construction material to improve the bearing capacity durability of frozen shaft lining structures in deep alluvium. According stress characteristics engineering environment lining, strength, impermeability, freeze–thaw damage, corrosion resistance are t...

An open-cage fullerene incorporating phosphorous ylid and carbonyl group moieties on the rim of orifice can be filled with gases (H2, He, Ne) in solid state, cage opening then contracted situ by raising temperature to complete an intramolecular Wittig reaction, trapping atom or molecule inside. Known transformations conversion product C60 containing endohedral species. As well as providing impr...

Fullerenes C60 have attracted considerable attention in the biomedical field due to their interesting properties. Although there has been a concern that C60 could be metabolized to hydroxylated fullerenes (C60(OH)x) in vivo, there is little information on the effect of hydroxylated C60 on liver cells. In the present study, we evaluated the cytotoxic effects of fullerene C60 and various hydroxyl...

The mechanisms underlying the cytotoxic action of pure fullerene suspension (nano-C60) and water-soluble polyhydroxylated fullerene [C60(OH)n] were investigated. Crystal violet assay for cell viability demonstrated that nano-C60 was at least three orders of magnitude more toxic than C60(OH)n to mouse L929 fibrosarcoma, rat C6 glioma, and U251 human glioma cell lines. Flow cytometry analysis of ...

Abstract Guanosine (GU) is a purine nucleoside that has different biological applications. This study aimed to synthesize, characterize, and enhance the activities of GU through its covalently grafting on polyvinyl alcohol (PVA), chitosan (CS), cellulose (CL). In this regard, conjugation was constructed by linkers such as chloroacetyl chloride, 2-bromopropionyl bromide, epichlorohydrin (EPCH). ...

As in the case of carbon nanotubes, also boron nitride nanotubes may host arrays of C60 molecules and form a nanopeapod (NPP). The observed separation between C60 molecules in BN NPP’s is consistently shorter than in carbon NPP’s, which influences their electronic properties. Here we report on total-energy pseudopotential density functional theory (DFT) calculations for polymerized and nonpolym...

Two new triazole-pyridine-bistetrazolate ligands were synthesized via a versatile procedure that allows for further derivatization; their corresponding homoleptic tris-ligand nona-coordinated lanthanide complexes are highly luminescent in the solid state and in a PVA polymeric matrix with measured values for the luminescence quantum yield of 70(7) and 98(9)% for Eu(III) and Tb(III), respectively.

The quenching rate constants of singlet oxygen by C60, H2@C60, D2@C6o, H2, and D2 in solution were measured. The presence of a hydrogen (H2@C60) or deuterium (D2@C60) molecule inside the fullerene did not produce any observable effect based on triplet lifetime or EPR measurements. However, a remarkable effect was found for the 1O2 quenching by C60, H2@C60, D2@C6o, H2, and D2. Singlet oxygen was...