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Single-station microtremor surveys for site characterization:A case study in Erzurum city,eastern Turkey

Earthquake Engineering and Engineering Vibration 2024年第3期23卷 563-576页

作者： fatih karsli Erdem Bayrak The Higher Education Credit and Hostels Institution Ministry of Youth and SportsErzurum 25240Turkey Earthquake Research Centre Ataturk UniversityErzurum 25240Turkey Department of Civil Engineering Ataturk UniversityErzurum 25240Turkey

The single-station microtremor method is one of the fastest,most reliable,and cheapest methods used to identify dynamic soil *** study utilizes 49 single-station microtremor measurements to identify the dynamic soil properties of the Hilalkent quarter of the Yakutiye district in *** dominant frequency and the amplification factor were calculated by using the Nakamura horizontal/vertical spectral ratio(H/V)*** the soil dominant frequency values varied between 0.4 Hz and 10 Hz,the soil amplification factor changed between 1 and *** H/V values were acquired with lower frequency *** vulnerability index(K_(g))and shear strain parameters that are utilized to estimate the damage that may be caused by an earthquake were *** in the west side of the study area,higher K_(g) values were *** shear strain map was created with 0.25 g,0.50 g and 0.75 g bedrock accelerations,and soil types that lost elasticity during an earthquake were *** average shear wave velocity for the first 30 m(V_(s30))was ***,it was observed that the western part of the study area,which resulted in a higher period and higher H/V,higher K_(g) and lower V_(s30) values,presents a higher risk of damage during an earthquake.

关键词： Nakamura horizontal/vertical spectral ratio single-station microtremor predominant frequency vulnerability index Erzurum

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Effects of Melatonin on Ischemia-Reperfusion Injury in Rat Ovary:Histopathologic and Immunohistochemical Study

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Open Journal of Obstetrics and Gynecology 2015年第11期5卷 639-645页

作者： Deniz Balsak Cihan Togrul Cenap Ekinci Kerem Doga Seckin Mehmet fatih karsli Aysun Ekinci Ali Emre Tahaoglu Hanefi Bademkiran Zuat Acar Senem Yaman Tunc Engin Deveci Günsen Kirman Department of Obstetrics and Gynecology School of Medicine Hospital University of Halic Istanbul Turkey Department of Obstetrics and Gynecology School of Medicine University of Hitit Corum Turkey Department of Histology and Embryology School of Medicine Hospital University of Dicle Diyarbakir Turkey Department of Obstetrics and Gynecology Kanuni Sultan Süleyman Education and Research Hospital Istanbul Turkey Department of Obstetrics and Gynecology Dr. Sami Ulus Education and Research Hospital Ankara Turkey Department of Biochemistry Faculty of Medicine University of Dicle Diyarbakir Turkey Department of Obstetrics and Gynecology Diyarbakir Gazi Yasargil Education and Research Hospital Diyarbakir Turkey Department of Obstetrics and Gynecology Diyarbakir Obstetrics and Gynecology Hospital Diyarbakir Turkey Department of Obstetrics and Gynecology Memory Hospital Diyarbakir Turkey Department of Obstetrics and Gynecology School of Medicine Hospital University of Dicle Diyarbakir Turkey

Aim: To investigate the effect of melatonin on ischemia–reperfusion (I/R) injury in rat ovary. Material and Method: A total of 24 Wistar rats were divided into four groups. The rats were first numbered randomly and then randomly divided into four equal groups: sham, torsion, detorsion and melatonin groups. In group I (n = 6) sham, as well as in group II ovary torsion was not performed and no drug was administered. In group III, 1 hour of ischemia and 2 hours of reperfusion were performed and no drug was given. In group IV, melatonin was dissolved in 1% ethanol just before use. Melatonin was injected 1 hour before torsion to the torsion plus melatonin group. Right ovaries were surgically removed in all groups. Result: Malondialdehyde (MDA) levels were measured. We suggested that administration of melatonin would be in treating ovaries from torsion/detorsion induced damage in humans. The histopathological changes such as vascular congestion, edema, hemorrhage, and follicular degeneration were found to be decreased in the melatonin + ischemia-reperfusion group. Ischemia-reperfusion group: PECAM-I expression is positive in vessel of the stromal area. The follicles and interfolicular area infiltrated with CD68 positive cells were increased in a time of ischemia-reperfusion exposure dependent manner. Conclusions: Melatonin after ischemia-reperfusion CD31 and CD68 expressions is weak, due to the reduction of the inflammatory effects and hemorrhage is thought that melatonin is effective.

关键词： Ischemia-Reperfusion Ovary Rat CD31 CD68

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