Phytochemical analysis, antioxidant, antimicrobial, anticholinesterase and DNA protective effects of Hypericum capitatum var. capitatum extracts

This is the first study on phytochemical analysis and biological evaluation of Hypericum capitatum Choisy var. capitatum (HCC) endemic to Turkey with exception of essential oil analysis. Hyperoside and isoquercetin (25.7 +/- 0.02 and 17.8 +/- 0.02 mu g/mg extract, respectively) were determined as the main compounds of the methanol extract. The major compounds of essential oil of HCC were found to be spathulenol and iso-longifolene (12.9% and 11.2%, respectively), and linoleic and palmitic acids (26.8% and 18.3%, respectively) were the main fatty acids. The methanol extract whose antioxidant activities studied for the first time was found to have moderate activity in beta-carotene bleaching method (IC50: 41.69 +/- 1.29 mu g/mL) and was found to be the most active extract in scavenging of DPPH free radical (IC50: 16.82 +/- 0.58 mu g/mL) and ABTS cation radical (IC50: 9.24 +/- 0.28 mu g/mL) and CUPRAC assays. Among the prepared four extracts of HCC, the methanol extract showed highest activity against Escherichia coli with an MIC value of 10 mu g/mL, and the methanol extract was also found to have high DNA damage protective activity. The methanol extract exhibited high butyrylcholinesterase inhibitory activity (70.74%). Thus, H. capitatum var. capitatum can be regarded as a potential natural antioxidant, antimicrobial, anticholinesterase source and DNA damage inhibitor. (C) 2016 SAAB. Published by Elsevier B.V. All rights reserved

Electrical, electromagnetic shielding, and some physical properties of hybrid yarn-based knitted fabrics

Recently, increasing number of studies are performed on protective fabrics containing metal wires for electromagnetic shielding purposes. In the present paper, the hybrid fabrics in plain and rib structures were knitted by using single and double ply hybrid yarns obtained by acrylic (PAC) yarns plied with stainless steel wires having two different diameters. The physical properties including conductivity, air permeability, pilling, and abrasion resistance as well as electromagnetic shielding effectiveness (EMSE) were measured. The variations in EMSE as well as reflection, absorption, and transmission and in other physical properties of knitted hybrid fabrics were investigated considering wire content and weave structure. It was seen that an increase in the wire content significantly increased the conductivity. Rib fabrics exhibited better EMSE values as compared with plain fabrics. Fabrics using two-folded yarns exhibited better EMSE values. Fabrics using thinner wire exhibited higher EMSE values. The highest EMSE value was obtained for rib-knitted fabric with 35 micrometer (m) stainless steel wire

Evolution of seismic hazard maps in Turkey

Due to copyright restrictions, the access to the full text of this article is only available via subscription.A review on the historical evolution of seismic hazard maps in Turkey is followed by summarizing the important aspects of the updated national probabilistic seismic hazard maps. Comparisons with the predecessor probabilistic seismic hazard maps as well as the implications on the national design codes conclude the paper

Evolution of seismic hazard maps in Turkey

A review on the historical evolution of seismic hazard maps in Turkey is followed by summarizing the important aspects of the updated national probabilistic seismic hazard maps. Comparisons with the predecessor probabilistic seismic hazard maps as well as the implications on the national design codes conclude the paper