The purpose of this study is to determinate the influence of surface roughness on the tribological behavior of a lubricated steel against steel tribosystem. Tests were carried out at high pressure and slow sliding speed, ...

This work presents the study of intramolecular and intermolecular interactions in tetraalkylsuccinamide[2]rotaxanes. These compounds have two submolecular components interlocked being obtained through a supramolecular ...

The crystal structure of the supramolecular complex between α-cyclodextrin and decanoic acid was determined: The aliphatic chain of the carboxylic acid is threaded through a head-to-head dimer of two cyclodextrin residues, ...

Rotaxanes are compounds that are made up of two submolecular components: a cyclic one (a ring) and a linear one (an axis) that threads the previous one and that, in addition, has bulky groups at their ends in order to keep ...

Reproducibility for successive determinations with a hanging mercury drop electrode is assessed in relation to solution stirring, drop size and back-diffusion to the mercury thread. The effect of experimental parameters ...

This work reports the synthesis of new [2]rotaxanes, [2]-[1,2-bis(aminocarbonyl- (1'-(1',1'-dimethylethyl)-1H-pyrazol-3'-yl))-ethane]-rotaxa-1,7,14,20-tetraaza- 2,6,15,19-tetraoxo-3,5,912,16,18,22,25-tetrabenzocicloexacosano], ...

The presence of progestogens in the cervical mucus suppresses and arrests sperm penetration. Using the Kremer technique, the effects of in vitro released progesterone, d norgestrel, and cyproterone acetate were studied by ...