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    Comparison of chemical compositions and antioxidant activities of the essential oils of two Ziziphora taxa from anatolia
    (Informa Healthcare, 2006) Konyalioglu, S; Ozturk, B; Meral, GE
    The aim of the current study was to investigate the protective effects of essential oils, used in traditional Turkish food and medicine, prepared from two Ziziphora subspecies against H2O2 -induced oxidative damage in human erythrocytes. Catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPx) activities, and effects of lipid peroxidation (LPO) and reduced glutathione (GSH) levels of the essential oils on erythrocyte were assessed. The results indicated that both essential oils of Ziziphora species were effective on antioxidant enzyme systems of erythrocytes when compared with H2O2 group. Ziziphora taurica Bieb. subsp. taurica was more effective than endemic Ziziphora taurica Bieb. subsp. cleonioides (Boiss) P. H. Davis on CAT, GPx, and SOD enzyme systems of erythrocytes. In this study, we established that the essential oils of Z. taurica subsp . taurica contained caryophyllene oxide (26.16%), ss-caryophyllene (24.80%), and germacrene-D (7.92%), and Z. taurica subsp . cleonioides contained (+)-pulegone (69.24%), piperitenone (6.47%), and limonene (3.59%). Results presented here may suggest that the essential oils possess antioxidant properties, and therefore they can be used in the nutraceutical or pharmaceutical industry.
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    Essential oil composition and antioxidant activity of endemic Ziziphora taurica subsp cleonioides
    (Elsevier Science Bv, 2002) Meral, GE; Konyalioglu, S; Ozturk, B
    The essential oil of Turkish endemic Ziziphora taurica subsp. cleonioides aerial parts was found to contain (+)-pulegone (81.86%), limonene (4.48%) and piperitenone (2.30%) activity The essential oil showed relevant antioxidant activity (C) 2002 Elsevier Science B.V. All rights reserved.
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    Fulvia fragilis (Bivalvia : Cardiidae): a lessepsian mollusc species from Izmir Bay (Aegean Sea)
    (Cambridge Univ Press, 2005) Ozturk, B; Poutiers, JM
    During studies performed on the ecological conditions of Izmir Bay and its biota, a population of Fulvia fragilis was observed to have recently colonized the bay. In this study, some comments are provided on the anatomical, ecological, taxonomical and distributional aspects of the species, which was first encountered during late 2001 in Izmir Bay.
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    Hypericum triquetrifolium Turra. extract exhibits antiinflammatory activity in the rat
    (Elsevier Ireland Ltd, 2002) Ozturk, B; Apaydin, S; Goldeli, E; Ince, I; Zeybek, U
    The aim of the present study was to explore the probable antiinflammatory effect of Hypericum triquetrifolium Turra. in a rat model of carrageenan induced inflammation. Male Wistar rats were treated intraperitoneally with 0.4% dimethlsulphoxide (DMSO) (as control group) and H. triquetrifolium extract (25, 50, 60 mg/kg), 30 min before 0.1 ml 1% carrageenan injection. Paw volume was measured before and 1, 2, 3, 4, 5 and 6 h after the injection of carrageenan. The results are expressed as the mean+/-s.e. mean and the statistical significance of differences between groups was analyzed by One Way Analysis of Variance (ANOVA). The intraplantar injection of carrageenan caused a time-dependent paw edema in the rat although saline injection caused no swelling. Intraperitoneal administration of H. triquetrifolium extract (25, 50, 60 mg/kg) inhibited paw swelling dose-dependently at 2. 3. 4. 5 and 6 h after carrageenan injection (P < 0.05). We can conclude that H. triquetrifolium extract may exert an antinflammatory effect in rats. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
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    Hypericum triquetrifolium Turra. extract exhibits antinociceptive activity in the mouse
    (Elsevier Sci Ireland Ltd, 1999) Apaydin, S; Zeybek, U; Ince, I; Elgin, G; Karamenderes, C; Ozturk, B; Tuglular, I
    The aim of the present study was to investigate the antinociceptive activity of Hypericum triquerifolium Turra. extract. The lyophilized extract was administered to male Swiss mice. Formalin paw test and tail flick tests were used for the evaluation of the antinociceptive activity. Plant extract (10, 25, 50 and 60 mg kg(-1), i.p.) (n = 16-24 for each group) or vehicle (n = 27) was administered 30 min before the subplantar formalin injection. In the tail flick test, mice were examined for latency to withdraw their tails from a noxious thermal stimulus using a tail flick meter (n = 8 for each group). The effects of the extract on sensorimotor performance was also assessed (n = 16-24 for each group). The extract caused a significant dose-related inhibition of the first phase (50, 60 mg kg(-1), i.p.) and second phase (10, 25, 50 and 60 mg kg(-1), i.p.) of formalin induced hindpaw licking. Additionally, the extract administration (50, 60 mg kg(-1), i.p.) increased the tail flick latencies. No significant change was observed in any of the treatment groups in the sensorimotor performance test. The observed antinociceptive activity of the extract may be due to its noradrenaline and serotonin reuptake blocking activity. Moreover, the probable antiinflammatory activity of the extract may play a role in the dose-related inhibition of the second phase of formalin paw test. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.
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    In vitro release of elements from prosthodontic base metal alloys: Effect of protein-containing biologic environments
    (Quintessence Publishing Co Inc, 2006) Efeoglu, N; Ozturk, B; Coker, C; Cotert, S; Bulbul, M
    Purpose: This study aimed to investigate the release of nickel, copper, zinc, cadmium, magnesium, and lead from prosthodontic base metal alloys into protein-containing biologic solutions. Materials and Methods: Dissolution experiments were conducted in either 3% Dulbecco's Modified Eagle Medium or 3% bovine serum albumin solutions for 7 weeks. Results: The protein-containing dissolution solutions and dissolution time did not have a significant effect on release of elements from the alloys (Kruskal-Wallis, P > .05). Conclusions: The amount of the released elements was well below the dietary intake levels of these elements. This study is important given the widespread use of the base metal alloys and the continuing public concerns/questions regarding the health benefits/risks associated with these materials.
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    Investigation of bacterial adherence to a non-precious alloy with radiolabeling method
    (Springer, 2006) Sonugelen, M; Destan, UI; Lambrecht, FY; Ozturk, B
    The objective of this study was to investigate the bacterial adherence to a non-precious alloy with radiolabeling method. S. mutans, E. coliand C. albicanswere labeled with Tc-99m by using stannous chloride and their radiolabeling yields were calculated. After the labeling procedure, metal disks (3 mmx10 mm) were treated with microorganisms. The amount of labeled microorganisms adhered on metal surfaces was determined by activity measurements. The labeling yields for S. mutans, E. coliand C. albicanswere 69.95 +/- 7.58%, 78.84 +/- 0.44% and 79.71 +/- 10.17%, respectively. The mean values for adherence for S. mutans, E. coliand C. albicanson metal samples were 7.02 +/- 2.18%, 0.96 +/- 0.49% and 8.80 +/- 8.24%, respectively. The radiolabeling method could be considered as safe and precise for determining the adherence of microorganisms.
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    Microbial adherence to a nonprecious alloy after plasma nitriding process
    (Quintessence Publishing Co Inc, 2006) Sonugelen, M; Destan, UI; Lambrecht, FY; Ozturk, B; Karadeniz, S
    Purpose: To investigate the microbial adherence to the surfaces of a nonprecious metal alloy after plasma nitriding. Materials and Methods: The plasma-nitriding process was performed to the surfaces of metals prepared from a nickel-chromium alloy. The microorganisms were labeled with technetium-99m. After the labeling procedure, 60 metal disks were treated with a microorganism for each use. Results: The results revealed that the amount of adherence of all microorganisms on surfaces was changed by plasma-nitriding process; adherence decreased substantially (P <.05) and the differences in plasma nitriding time were not significant (P >.05) Conclusion: With the plasma-nitriding process, the surface properties of nonprecious metal alloys can be changed, leading to decreased microbial adherence.
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    Morphological face measurements of the edentulous and dentulous patients.
    (Int Amer Assoc Dental Researchi A D R/A A D R, 2003) Ekmekci, E; Ozturk, B; Sabah, ME
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    On the occurrence of Mytilaster marioni (Locard, 1889) (Mollusca; Bivalvia; Mytilidae) in Bafa Lake (Turkey), with a redescription of the species
    (Springer, 2002) Ozturk, B; Poutiers, JM; Sari, HM; Ozbek, M
    In the framework of the study performed in 1997 on the ecological conditions of Bafa Lake and its benthic fauna and flora, a dense population of Mytilaster marioni (Locard, 1889) was observed to have recently colonised the lake. In this study, the ecological changes of the lake induced by a modification of the freshwater inflow, as well as the ecological and taxonomical features of M. marioni, have been investigated. This is the first record of the species from the coastal lakes of the Aegean Sea.
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    Posterior bridges retained by resin-bonded cast metal inlay retainers: a report of 60 cases followed for 6 years
    (Wiley, 1997) Cotert, HS; Ozturk, B
    Between May 1989 and July 1994, 60 adhesive fixed partial posterior dentures retained by resin-bonded cast metal inlays were placed under controlled conditions. The influence of prognostic factors on the event free and service duration was investigated with univariate and multivariate analysis. The majority of the failures (16 of 18) were caused by loss of adhesion at the metal cement interface and were observed either as debonding of the restorations completely or dislodgement of a single retainer. The other two failures appeared as secondary caries. Univariate analysis demonstrated that, retainer type, approximal configuration and dentine exposition had no effect on the event free service duration. On the other hand, gingival finishing level and luting agent were found to have an effect. Univariate testing was also conducted for the overall service duration and none of the variables were found to have an effect. Multivariate Cox Regression Analysis was performed to estimate the influence of categorical covariates: type of retainer, approximal preparation modification, gingival finishing level, preparation depth and luting agent on survival rates of event free and overall service duration. Luting agent was found to be the single independent prognostic variate (P < 0.0001) for the event free service duration and the other covariates were rejected. For overall service duration, none of the variables were found to be effective.
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    Prosthetic rehabilitation of extremely worn dentitions: Case reports
    (Quintessence Publishing Co Inc, 2002) Cura, C; Saracoglu, A; Ozturk, B
    The stomatognathic system is a complicated structure, and patients usually adapt to their existing vertical dimension of occlusion. Therefore, prosthetic rehabilitation of decreased vertical dimension of occlusion should be considered only when dictated by esthetic or functional requirements. If the loss of vertical dimension is significant, provisional prostheses should be used before the final prosthesis to prevent tension or pain in the temporomandibular joints and the muscles as the patient adapts to the new dimensions. Acrylic resin provisional prostheses were used for three patients before the final prosthesis was fabricated with the restored vertical dimension of occlusion. The period of use varied, depending on the patient's individual adaptive ability. The important aspect is to find the most comfortable position for the patient.
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    Seasonal analysis of zoobenthos associated with a Zostera marina L. bed in Gulbahce Bay (Aegean Sea, Turkey)
    (Blackwell Wissenschafts-Verlag Gmbh, 1998) Cinar, ME; Ergen, Z; Ozturk, B; Kirkim, F
    A seasonal sampling of three stations in Gulbahce Bay (Aegean Sea) for the zoobenthic organisms associated with a Zostera marina bed was carried out during 1993-94. Temperature, salinity and oxygen were recorded each sampling period. A total of 7 taxonomic groups were determined: Polychaeta was the dominant group comprising 77 % of the total taxa and individuals, followed by Crustacea, Bivalvia and other groups such as Nemertea, Sipuncula, Turbellaria and Phoronida. Of the 108 taxa encountered, the polychaetes Notomastus latericeus and Caulleriella alata accounted for 49 % of the total populations. The species abundance did not show major changes among seasons, with highest values in fall (982 indiv.. m(-3) and lowest in spring (754 indiv.. m(-3) Diversity and evenness of the samples were relatively high and fairly constant, and were affected by the dominance levels of the species.
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    Tensile bond strength of enamel-resin-metal joints
    (Mosby-Elsevier, 1996) Cotert, HS; Ozturk, B
    This study observed the effects of the alloy type, resin type, and simulated occlusal loading on enamel-resin-metal tensile bond strength. Three different dental alloy samples were sandblasted with 50 mu m of desiccant alumina and then bonded to the buccal and lingual halves of extracted human molars with four different dental resins. Specimens were divided into two groups, which included different halves of tooth samples. For one group tensile strength was tested after 19.8 N per 60,000 loading cycles. For the other group tensile testing was performed without cyclic loading. The results revealed that enamel-resin-metal bond strength was not affected by alloy type. However, a close relationship between the resin type and the bond strength was found. It was demonstrated that Panavia Ex and Concise resins produced greater bond strengths than did ABC and MBA cements. Also, a significant decrease in tensile bond strength values occurred after cyclic loading.
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