Neutron reflection and adsorption isotherm measurements have been used to study the adsorption behaviour of hexanoic acid onto α-alumina surfaces. Importantly, the pH dependence of the behaviour has been characterised with a pronounced maximum in adsorption identified at a pH of approximately 5, close to the pKa of the acid. The adsorbed layer is identified as a bilayer, which is reasonable giv...

Polylactide (PLA) stereocomplexes (SCs) containing amorphous block copolymers have gained enormous interest due to their unique properties and wide range of potential applications. In this work, we report the synthesis non-covalent triblock terpolymers: polystyrene–SCPLA–polyisoprene (PS–SC–PI) via stereocomplexation PS-b-PDLA with PI-b-PLLA diblock through solution-precipitation method. The we...

Chemosignals are mediators of social interactions in mammals, providing con- and hetero-specifics with information on fixed (e.g., species, sex, group, individual identity) variable social, reproductive, health status) features the signaler. Yet, methodological difficulties recording quantifying odor signals, especially field conditions, have hampered studies natural systems. We present first u...

Since juvenile hormone (JH) is involved in a wide range of physiological processes in both developing and mature insects (Riddiford, 1994), compounds that possess anti–JH activity are potentially useful not only as biochemical probes to assist in elucidating the role of JH in insect development and reproduction, but also as insect growth regulators (Staal, 1986). Several compounds including pre...

We have isolated from the rumen of the sheep an anaerobic Gram-negative coccus which ferments glucose, fructose, maltose, mannitol, sorbitol and DL-lactate with the production of hydrogen and carbon dioxide, acetate, propionate, n-butyrate, npentanoate and n-hexanoate (Elsden, Gilchrist, Lewis & Volcani, 1951). Since it is our intention to discuss the taxonomic position of this organism in a se...

1. The factors concerned in the estimation of P/O ratios when fatty acids are oxidized by rat-liver mitochondria have been assessed. 2. The oxidation of butyrate, hexanoate and octanoate is accompanied by ATP synthesis. At low concentrations of the fatty acids, P/O ratios approximately 2.5 are obtained. 3. Oxidative phosphorylation is uncoupled, respiratory control ratios are lowered and respir...

The objective of this study was to determine volatile compounds, color parameters and sensory characteristics in raw sheep milk cheeses ripened up 270 days using different packaging materials such as goat’s skin bag or plastic barrel. Volatile compounds extracted by solid-phase microextraction were separated, identified quantified a gas chromatography (GC)-mass spectrometry detector (MS). Butan...