BACKGROUND Propolis is widely used in apitherapy, preparations, and food and beverage additives. Various extraction techniques were applied in the extraction of the biologically active constituents of poplar type propolis in order to compare their efficiency. The methods employed were: traditional maceration extraction, ultrasound extraction (UE), and microwave assisted extraction (MAE). RESU...

Feature extraction has long been an important topic in pattern recognition. Although many authors have studied feature extraction for parametric classifiers, relatively few feature extraction algorithms are available for non-parametric classifiers. In this paper we propose a new feature extraction algorithm based on decision boundaries for nonparametric classifiers. We note that feature extract...

A lthough the North American Society of Pacing and Electrophysiology policy statement on lead extraction does not indicate non-functional leads as either class I or II indications (with the exception of non-functional leads in young patients), there is a tendency to view removal of any non-functional lead as desirable. 2 The protagonists for this vision argue that leads are neither permanent no...