The degradation kinetics of different phenolic substrates utilised by Trichosporon cutaneum R57 was studied. The following compounds were used as substrates: phenol, resorcinol, hydroquinone, 3-nitrophenol, 2,6-dinitrophenol, 3-chloro phenol and p-cresol. The specific degradation rates (Qs ) were described by a Haldane kinetic model. The unknown model parameters were estimated using the mathema...

Immediate pigment darkening, the first response of skin to solar exposure leading undesired irregular pigmentation and dark spots, is rapid onset melanin resulting from oxidation melanogenic indoles, namely 5,6-dihydroxyindole (DHI) 5,6-dihydroxyindole-2-carboxylic acid (DHICA) available in epidermal melanocytes. The search for effective sunscreen formulations nowadays focused on UVA/B filters ...

A simple, mild and high efficient procedure for one pot three component synthesis of 2-amino 4-H chromene derivatives was studied. The reaction was performed in water using aryl aldehydes, malononitrile and resorcinol, phloroglucinol or naphthole in the presence of N-methyl D-glucamine (Meglumine) as a green high efficient catalyst. The reaction was studied in thermal, microwave (MW) and ultras...

A simple, mild and high efficient procedure for one pot three component synthesis of 2-amino 4-H chromene derivatives was studied. The reaction was performed in water using aryl aldehydes, malononitrile and resorcinol, phloroglucinol or naphthole in the presence of N-methyl D-glucamine (Meglumine) as a green high efficient catalyst. The reaction was studied in thermal, microwave (MW) and ultras...

There are three types of adhesion difficulties faced by the Babylon Tyre manufactured: bonding the inner liner to the fabric cord, bonding the tread to the breaker bandage, and bonding the sidewall to the bead apex. We have investigated the adhesion between layers of tyre by using maleic anhydride (MA) in an elastomer while using phenolic resin, resorcinol, or novolak in another elastomer to un...

The aim of this study was to investigate aerobic biodegradability of phenol, resorcinol and 5-methylresorcinol and their different two-component mixtures using activated sludge sampled from the Kohtla-Järve wastewater treatment plant. The degradation behaviour of phenolic compounds was investigated by respirometry. Non-linear regression analysis was used for determination of the kinetic paramet...

BACKGROUND The oleaginous yeast, Trichosporon oleaginosus, has been extensively studied for its ability to metabolize non-conventional feedstocks. These include phenol-containing waste streams, such as distillery wastewater, or streams consisting of non-conventional sugars, such as hydrolyzed biomass and various bagasse. An initial BLAST search suggests this yeast has putative aromatic metaboli...

The synthesis of silica, carbon or polymer nanospheres and capsules has attracted widespread interest because of their potential applications in the fields of drug delivery, catalysis, photonic crystals, biodiagnostic or energy storage. Special attention has been paid to colloidal silica nanospheres of uniform size. These particles are commonly produced by the hydrolysis and condensation of sil...

Two novel simple, precise and rapid spectrophotometric methods (Mehod A and Mehod B) are proposed for the determination of sulfamethaxazole (SFZ) using ferric chloride and potassium ferricyaide, sodium nitrite and resorcinol, as reagents. Method A is based reduction of Fe+3 by SFZ and Fe+2 produced forms complex with potassium ferricyanide to form a green colored chromogen having maximum absorp...

ATTEMPTS have been made to classify the phenolases into groups such as the catechol oxidases, tyrosinases, and laccases [Raper, 1928], but the classification is made difficult by the lack of satisfactory methods of characterising the enzymes [Onslow and Robinson, 1928]. The present work was undertaken with the object of testing whether the catechol oxidases of different origin behave similarly ...