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    Fungal and bacterial diseases control with Elexa™ plant booster
    (Parlar Scientific Publications (P S P), 2008) Acar, Okan; Akı, Cüneyt; Erdugan, Hueseyin
    Elexa is a plant booster that elicits specific defense responses in various plants against certain fungal and bacterial diseases. Rather than killing hostile fungi that attack plants, Elexa acts as a preventative and stimulative agent to protect plants from pathogens. Elexa contains 4% chitosan. In the present study, a 0.1% concentration of Elexa was used to evaluate the biological efficiency in cucumber (Cucumis sativus L.), tomato (Lycopersicum esculentum Mill.) and potato (Solanum tuberosum L.) plants, as foliar spray against fungal (Botrytis cinerea Pers., gray mold), (Pseudoperanospora cubensis (Berk & Curt) Rostow, downy mildew), (Phytophtora infestans (Mont) de Bary, late blight) and bacterial (Pseudomonas lachrymans (Smith & Ryan) Carsner, angular leaf spot) diseases in greenhouse conditions. Elexa was also used to evaluate the inhibitory effect of in vitro germination against B. cinerea Pets. and P. lachrymans (Smith & Ryan) Carsner. Our results demonstrated that Elexa is a good plant booster for disease management and defense elicitation in commercial formulations. Elexa also exhibited inhibitory effects in in vitro germination of B. cinerea Pers. and P. lachrymans (Smith & Ryan) Carsner. It was observed that chitosan as well as elicitors, such as Elexa, produced with its chitosan content, provide 60% of protection against the damage caused by late blight, gray mold, downy mildew in potato and tomato plants, as well as angular leaf spot in cucumber, respectively.
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    Loliolide in marine algae
    (Taylor & Francis Ltd, 2009) Percot, Aline; Yalcin, Ahmet; Aysel, Veysel; Erdugan, Hueseyin; Dural, Berrin; Guven, Kasim Cemal
    Loliolide content was determined in 13 marine algae including red, brown and green algae collected from the Black Sea, the Dardanelles and the Aegean Sea. Identification and quantification were performed by gas chromatography-mass spectrometry. The loliolide content in green alga is 1.76 g g-1, ranges from 0.14 to 4.35 g g-1 in red and from 0.18 to 4.83 g g-1 in brown algae. The results obtained are in the same range as previously reported for algae, as well as terrestrial plants. This article represents the first report of loliolide occurrence in green algae.
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    New Record for the East Mediterranean, Dardanelles (Turkey) and its Distribution: Polysiphonia morrowii Harvey (Ceramiales, Rhodophyta)
    (Central Fisheries Research Inst, 2009) Erdugan, Hueseyin; Akı, Cüneyt; Acar, Okan; Dural, Berrin; Aysel, Veysel
    In this study, Polysiphonia morrowii Harvey was reported in the east Mediterranean and the coasts of Turkey for the first time.
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    Osteryoung square wave voltammetric determination of phenazopyridine hydrochloride in human urine and tablet dosage forms based on electrochemical reduction at carbon paste electrode
    (Bentham Science Publ Ltd, 2007) Citak, Meryem; Yilmaz, Selahattin; Dilgin, Yusuf; Tuerker, Guelen; Yagmur, Sultan; Erdugan, Hueseyin; Erdugan, Necla
    An electroanalytical method was developed for the direct quantitative determination of phenazopyridine hydrochloride (PAP) or in other words, pyridium, in spiked human urine and tablet dosage forms. The electrochemical reduction and determination of PAP were carried out at carbon paste electrode (CPE) in various aquaeous Solution in the pH range of 0.5-12.30 by (CV) and osteryoung square wave voltammetry (OSWV). The best results were obtained for the quantitative determination of PAP by OSWV method in 0.5 mol L-1 Sulfuric acid at about pH 0.51. The peak current and peak potential depend on pH and scan rate were studied. The diffusion controlled nature of the peak was established. This electroanalytical procedure made it possible to determine PAP in the concentration range 2.5x10(-8)-2.5x10(-6) mol L-1. Limit of detection (LOD) and limit of quantification (LOQ) were obtained as 7.5x10(-9) and 2.5x10(-8) mol L-1 respectively. Precision and accuracy of the developed method were checked by recovery studies in spiked urine and tablet dosage forms.
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    ?-Phenylethylamine content in marine algae around Turkish coasts
    (Walter De Gruyter Gmbh, 2009) Percot, Aline; Yalcin, Ahmet; Aysel, Veysel; Erdugan, Hueseyin; Dural, Berrin; Gueven, Kasim Cemal
    beta-Phenylethylamine content was investigated in two green, five brown, and ten red marine algae by gas chromatography/mass spectrometry. beta-Phenylethylamine was found in six red algae but was not detected in the brown and green algae studied. The highest amount of beta-phenylethylamine was determined in Gelidium crinale (30.42 mu g g(-1)). This is the first report of beta-phenylethylamine in the algae tested and also the first to quantify beta-phenylethylamine in marine algae.