Ali Kemal Ayan

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Hypericum triquetrifolium Turra (Guttiferae) has received considerable scientifi c interest in recent years, as it is a source of a variety of biologically active compounds including phenolics. Th e present study was conducted to determine the variation in the content of several phenolics, namely phenylpropane chlorogenic acid and fl avonoids such as rutin,(More)
Several species ofHypericum are used in traditional Turkish folk medicine. Their most medicinally important secondary metabolites are the hypericins, hyperforins, and phenolics. Here, we determined the ontogenetic, morphogenetic, and diurnal variations in total phenolics contents fromH. aviculariifolium subsp.depilatum var.depilatum (endemic),H.(More)
The genus Hypericum has attracted scientific interest worldwide in recent years, since it is a source of a variety of biologically active compounds including the phenolics. The present study was to determine ontogenetic, morphogenetic and diurnal variation of the total phenol contents in some Hypericum species growing in Turkey namely, H. nummularioides, H.(More)
The principle medicinal secondary metabolites present in Hypericum species are thought to be naphthodianthrones hypericin and pseudohypericin. The present study was conducted to determine ontogenetic and morphogenetic variations of hypericin and pseudohypericin contents in Hypericum triquetrifolium growing in two sites located in Northern Turkey. Plants(More)
Species of the genusHypencum are of considerable interest worldwide because of their medicinal properties.In- vitro culture is a useful tool for both multiplication of the genus and studying its economically important secondary metabolites. Here, we present an effectivein- vitro propagation method forH. bupleuroides. Leaf and internodal expiants excised(More)
In the present study, seed germination requirements of two Turkish Hypericum species, namely H. triquetrifolium and H. heterophyllum were studied by performing some pre-soaking treatments with the aim of describing suitable germination protocols. Before placing the seeds in Petri dishes, they were soaked in 50, 100 or 150 mg/L gibberellic acid (GA3); 1, 2(More)
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