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        Analysis of the Orientational Order Parameter and the Magnetic Field as Functions of Temperature for p-anisaldazine

        Hamit Yurtseven,Ethem Kaya 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11

        We analyze in this study the orientational order parameter and the magnetic field as functions of temperature close to the nematic-isotropic liquid (NI) transition in anisaldazine. The experimental data from the literature are analyzed by using a power-law formula for both the orientational order parameter and the magnetic field, and the critical exponents are deduced. In particular, the mean field value of = 0.5 for the critical exponent of the orientational order parameter is used, and the power-law formula is fitted to the experimental data. Our fits and the values of the critical exponents for the temperature dependence of the orientational order parameter and the magnetic field indicate weak first-order transition, and they adequately describe the observed behavior of the nematic-isotropic liquid transition in anisaldazine.

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        Antimicrobial Activity and Chemical Composition of Some Essential Oils

        Arldogan, Buket-Cicioglu,Baydar, Hasan,Kaya, Selcuk,Demirci, Mustafa,Ozbasar, Demir,Mumcu, Ethem The Pharmaceutical Society of Korea 2002 Archives of Pharmacal Research Vol.25 No.6

        In this study the composition and antimicrobial properties of essential oils obtained from Origanum onites, Mentha piperita, Juniperus exalsa, Chrysanthemum indicum, Lavandula hybrida, Rosa damascena, Echinophora tenuifolia, Foeniculum vulgare were examined. To evaluate the in vitro antibacterial activities of these eight aromatic extracts; their in vitro antimicrobial activities were determined by disk diffusion testing, according to the NCCLS criteria. Escherichia coli (ATTC 25922), Staphylococcus aureus (ATCC 25923) and Pseudomonas aeruginosa (ATTC 27853 were used as standard test bacterial strains. Origanum onites recorded antimicrobial activity against all test bacteria, and was strongest against Staphylococcus aureus. For Rosa damascena, Mentha piperita and Lavandula hybrida antimicrobial activity was recorded only to Staphylococcus aureus. Juniperus exalsa, and Chrysanthemum indicum exhibited antibacterial activities against both Staphylococcus aureus and Escherichia coli. We also examined the in vitro artimicrobial activities of some components of the essential oils and found some components with antimicrobial activity.

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