Dudu Özkum

Essential Oils From Wild and Micropropagated Plants of Origanum minutiflorum O. Schwarz et Davis

Abstract Water-distilled essential oil of Origanum minutiflorum, an endemic species in Turkey was analyzed by gas chromatography and gas chromatography/mass spectrometry. Carvacrol (78.6%), p-cymene (7.7%) and γ-terpinene (2.2%) were identified as major constituents. The oil of micropropagated O. minutiflorum was also investigated and the results were compared with those from wild plants. Phytochemical studies of the plants indicated that in vitro propagation method increased the phenolic monoterpene (carvacrol) content, with a similar profile of other constituents.

Effects of l -Proline and Cold Treatment on Pepper ( Capsicum annuum L.) Anther Culture

Comparison of cold-shock treatments (at 4°C for 48 and 96 h) of pepper buds with a control (not subjected to cold treatments) has no effect on the production of embryo from cultured pepper anthers. The effects of cold shock treatments were not changed when the l-proline was added to the induction medium (40, 125 and 500 mg L−1). Cold treated anthers showed a lower response or non response than control anthers. Regeneration frequency did not appear to be affected by the presence of l-proline in the induction medium. The highest numbers of embryos (12.5 embryos/100 anthers) were obtained from the control anthers that were cultured on induction medium, MS medium, containing 4 mg L−1 naphthalene acetic acid (NAA) and 1 mg L−1 benzyladenine (BA) and activated charcoal without l-proline.

Discussion of “Depth-Averaged Drag Coefficient for Modeling Flow through Suspended Canopies” by David R. Plew

O. Yagci; U. Turker; and D. Ozkum Associate Professor, Istanbul Technical Univ., Civil Engineering Faculty, Division of Hydraulics, 34469 Maslak, Istanbul, Turkey (corresponding author). E-mail: yagciora@itu.edu.tr Assistant Professor, Eastern Mediterranean Univ., Civil Engineering Dept., Division of Hydraulics, Gazimagusa, North Cyprus, Turkey. Assistant Professor, Near East Univ., Faculty of Pharmacy, Division of Pharmaceutical Botany, Dikmen, Lefkosa, North Cyprus, Turkey.