This paper describes a novel method of sample preparation for the determination of trace concentrations of polycyclic aromatic hydrocarbons (PAHs) in high-boiling petroleum products. Limits of quantitation of the investigated PAHs in materials of this type range from tens of nanograms per kilogram to <20 μg/kg. The studies revealed that in order to separate most of interferences from the analyt...

Essential oils have been used since ancient times in traditional medicine and agri-food science to preserve food, combat human diseases. (EOs) from clove rosemary, obtained by hydro-distillation, were analyzed GC/MS evaluated for their antifungal activity against strains of Aspergillus tubingensis A. luchuensis effect on ochratoxin A (OTA) production these fungi. The major constituent EO was eu...

Ochratoxin A (OTA) is a widespread and abundant natural carcinogenic mycotoxin produced by several species of Aspergillus and Penicillium fungi. Due to the ubiquitous presence of these fungi in food and potential risk for human health, a rapid and sensitive in vitro detection assay is required. Analytical methods for OTA detection/identification are generally based on liquid-liquid extraction, ...

Forming Limit Diagrams are useful tools for evaluation of formability in the sheet metals. In this paper the effects of yield criteria on predictions of the right and left-hand sides of forming limit diagrams (FLDs) are investigated. In prediction of FLD, Hosford 1979, “Karafillis-Boyce” (K-B) and BBC2000 anisotropy yield functions have been applied. Whereas the prediction of FLD is based on th...

Attempts were made to assess the toxicity and to analyze paralytic toxin profiles of xanthid crab Atergatis floridus collected on two reefs on the leftand the right-side, tentatively designated as site A and B, separated by the passage at the outside of Kabira Bay in Ishigaki Island, Okinawa Prefecture, Japan in comparison with those of the same crabs from Camotes Island off the eastern coast o...

The conventional principal component analysis (PCA) and Fisher linear discriminant analysis (FLD) are both based on vectors. Rather, in this paper, a novel PCA technique directly based on original image matrices is developed for image feature extraction. Experimental results on ORL face database show that the proposed IMPCA are more powerful and e:cient than conventional PCA and FLD. ? 2002 Pat...

Principal Component Analysis (PCA) has emerged as a more efficient approach for extracting features for many pattern classification problems. It has been the standard approach to reduce the high-dimensional original pattern vector space into low-dimensional feature vector space, that removes some of the noisy directions. PCA is an unsupervised technique which does not include label information ...