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Articles by Muhsin Konuk
Total Records ( 4 ) for Muhsin Konuk
  Suleyman Cenkci , Mustafa Kargioglu , Sergun Dayan and Muhsin Konuk
  The objective of this study were to investigate present endangered status and propagation of Thermopsis turcica, which is a very unusual plant species for Turkey. T. turcica grows in a very narrow area located between the Eber and Aksehir Lakes. The field studies indicated that holding unhealthy seeds due to pest infestation and clearing new agricultural fields are two major threatened factors for T. turcica. In sterile conditions, concentrated sulfuric, hydrochloric and nitric acid pre-treatments for 0, 30, 60, 90 and 120 min used to germinate T. turcica seeds which were only obtained from small Eber populations. 99% seed germination within a few days was achieved from 120 min. sulfuric acid pretreatment; whereas the hydrochloric and nitric acid treatments did not have effect on the germination (<20%) of T. turcica seeds. In non-sterile conditions, however, a maximum 61% germination was obtained from 120 min sulfuric acid pretreated seeds. Although 20% non-sterile seedlings were survived, 86% in vitro seedlings acclimatized to green house conditions were alive after 14 weeks. This propagation technique, in vitro germination-acclimatizing to the soil, could be used to propagate endangered plant species suffering from germination and seedling development.
  Mehmet Karacali , Sait Bulut , Muhsin Konuk and Kemal Solak
  The seasonal variations of fatty acids compositions in the muscle, liver, and ovarian tissues of mirror carp (Cyprinus carpio) living in Örenler Dam Lake were determined by using gas chromatography. The results obtained were subjected to statistical analyses by employing SPSS software and p < 0.05 was accepted as significant value. In the statistical analyses, multiple comparisons tests were performed. The results showed that monounsaturated fatty acids levels were found to be higher than that of polyunsaturated fatty acids and saturated fatty acids in all seasons. Palmitic and stearic acid levels were the highest in ovaries (19.95% in winter and 7.79% in summer, respectively). Oleic and palmitoleic levels were at the highest levels in liver tissues (34.53% in summer and 18.37% in winter, respectively). Docosahexaenoic (C22:6?3, DHA), eicosapentaenoic (C20:5ω3, EPA), eicosatrienoic acid, and arachidonic (C20:4ω6, AA) levels were at the highest level as 17.27, 2.54, and 8.41% in ovaries in the winter and 6.37% in muscle tissues in the spring, respectively. ω3/ω6 ratios were 0.62–0.98 in muscle, 1.54–2.82 in the liver, and 2.82–3.89 in the ovaries. From the point of total fatty acid variations, the highest variations were observed as follows: muscle in spring (26.73%), liver in winter (33.85%), and ovaries in winter 36.38%.
  Ijlal Ocak , Ali Celik , M. Zafer Ozel , Elif Korcan and Muhsin Konuk
  Endemic oregano’s, Origanum hypericifolium O. Schwartz and P.H. Davis, essential oil was extracted to exert its biological activity in vitro. Fifteen components in its extracts performed by hydro distillation. The major components in the fruit and flower volatiles of O. hypericifolium were p-cymene (34.33 g/100 g oil), carvacrol (21.76 g/100 g oil), thymol (19.54 g/100 g) and γ-terpinene (13.91 g/100 g oil). The antifungal activity of O. hypericifolium’s oil was evaluated against 14 fungi isolated from hazelnut and walnut. Nuts are capable of harboring toxigenic fungi and the threat of mycotoxin contamination on them exists. Essential oil of O. hypericifolium was found to be active both in contact and headspace assays in vitro producing hyphal growth inhibition. In the contact assay, P. frequentans was found to be the least sensitive species. The more sensitive species were P. castellonense, P. verrucosum. var. cyclopium, C. globosum, and A. kiliense. Their growth was completely (100%) inhibited at days 3 and 6. In the volatile assay, all the mycelial growth of all tested fungi was completely inhibited at day 3. The volatile activity was found to be highly efficient than that of contact activity assay. This could be because of the aromatic contents of Origanum, such as monoterpenes, carvacrol, thymol, and p-cymene.
  Sait Bulut , Levent Akkaya , Veli Gok and Muhsin Konuk
  Kaymak and butter are traditionally produced from cream of cow or buffalo milk and consumed as Turkish dairy products. About 16 Organochlorine Pesticide (OCP) residues in kaymak and butter marketed in Afyonkarahisar province of Turkey were analyzed by gas chromatography technique. The results showed that kaymak and butter samples were contaminated with 13 and 15 OCPs, respectively. The amount of total OCPs was determined as 672.46 ng g-1 in kaymak and 308.95 ng g-1 in butter samples. The gas chromatography results indicated that three OCPs [(Beta-HCH (90.01 ng g-1), Aldrin (528.04 ng g-1 ) and Endrin (7.31 ng g-1 )] in kaymak and five OCPs [(Beta-HCH (214.18 ng g-1 ), Heptachlor (10.38 ng g-1 ), Aldrin (12.34 ng g-1 ), Dieldrin (12.69 ng g-1) and Endosulfan Sulfate (8.08 ng g-1 )] in butter were found to exceed the accepted level set by the EU Codex. Overall, OCP residues of kaymak and butter could be a potential risk for public health due to their extensive consumption.
 
 
 
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