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EN
A simple, rapid, and sensitive high-performance liquid chromatography method was developed and validated for the simultaneous determination and quantification of fusidic acid and steroids (prednisone, betamethasone valerate, hydrocortisone acetate, and dexamethasone sodium) from bulk drugs and human plasma. A RP-HPLC, operated at ambient temperature, was equipped with a UV detector for monitoring the effluents at 235 nm. The mobile phase consisted of methanol, acetonitrile, and 0.05 M phosphoric acid (10:60:30, v/v/v), and separation was achieved on a Medeterrane, C18 (5 μm, 12.5 × 0.46 mm) column at a flow rate of 1.7 mL min -1. Calibration curves were linear over concentration range 0.625–10 μg mL -1 with correlation coefficient (r2) greater than 0.9999. The coefficient of variation (CV) and relative error (RE) for intra- and interassay were <2% and <1%, respectively. Interference of other already administered common medicaments, such as aspirin, paracetamol, caffeine, nicotine, and other plasma components, were not found.
EN
A rapid and sensitive high-performance liquid chromatographic method has been developed and validated for the simultaneous determination and quantification of cephalosporins (cefpirome, cefaclor, ceftazidime, and cephradine) in pharmaceutical formulations. Separation was achieved in the presence of caffeine as internal standard on a Mediterranea C18 (5 μm, 25 × 0.46 mm) column. The mobile phase was composed of methanol and water (30:70), which was pumped at a flow rate of 1 mL min-1. Effluents were monitored at 265 nm. The assay was linear in the concentration range of 0.5–50 μg mL -1, with the correlation coefficient (r2) greater than 0.9998. The intra-day and inter-day coefficients of variation (CV %) were less than 4% at different concentrations.
3
Content available remote Quasi-symmetric B-categories
EN
This paper deals with B-categories where B is a quantaloid obtained from a right Gelfand quantale Q. Quantale is non-commutative extension of concept of locale. A notion of sheaf for Q is introduced; it turns out that these sheaves are precisely quasi-symmetric skeletal Cauchy-complete B-categories. In particular if Q is a locale, this construction reduces to that given in ”Sheaves and Cauchy-complete Categories” by R.F.C. Walters.
EN
The potential of the MOVPE growth process for millimeter and submillimeter wave generation and amplification is presented. The increase in layer quality, the improved homogeneity and purity, the precision of mono-layers growth and wide spectrum III-V compounds makes MOVPE techniques very attractive for modern device applications. The characterisation results of the heterostructures dedicated for HBV varactors and 2-DEG transistors (HEMT) are described.
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