Search

International audience; The distribution of plate motion between multiple fault strands and how this distribution may evolve remain poorly understood, despite the key implications for seismic hazards. The North Anatolian Fault in northwest Turkey is a prime example of a multistranded continental transform. Here we present the first constraints on late Quaternary slip rates on its northern branch across the Cinarcik Basin in the eastern Marmara Sea. We use both deep penetration and high-resolution multichannel seismic reflection data with a stratigraphic age model to show that a depocenter has persisted near the fault bend responsible for that transform basin. Successively older depocenters have been transported westward by fault motion relative to Eurasia, indicating a uniform right-lateral slip rate of 18.5 mm/yr over the last 500,000 years, compared to overall GPS rates (23-24 mm/yr). Thus, the northern branch has slipped at a nearly constant rate and has accounted for most of the relative plate motion between Eurasia and Anatolia since ~0.5 Ma.

The respiratory tract contains numerous peptides secreted from special pulmonary epithelial cells which are called endocrine cells. The function of neuroendocrine cells is modulated by amines. Serotonin has strong vasomotor and bronchomotor effects in the airway mucosa. The objective of this study was to determine presence and distribution of serotonin-positive endocrine cells in respiratory tract of goat and bovine via PAP (peroxidase anti-peroxidase) technique. As a result, while serotonin-immunoreactive cells were found in glands of larynx and bronchial epithelium in bovine, no positive cells were detected in goat. The present study suggests that the distribution of serotonin-immunoreactive cells may show differences between both respiratory tract regions and mammalian species.

This paper presents selections from and a synthesis of a high resolution bathymetric, sparker and deep-towed seismic reflection data set recently acquired by the French Ifremer R. V Le Suroit in an E-W deep trough that forms the northern half of the Sea of Marmara in NW Turkey. It includes the first high resolution complete bathymetric map of this area. A single, throughgoing dextral strike-slip fault system, which is the western continuation of the northern branch of the North Anatolian Fault, cuts this trough lengthwise and joins the 1999.8.17 Kocaeli earthquake fault with the 1912.8.09 Sarkoy-Murefte earthquake fault, both of which display strike-slip offset. In its eastern one fourth, the structure follows closely the northern margin of the deep trough, whereas in the west it hugs its southern margin. The eastern one fourth of the structure has a minor component of its displacement distributed across the deep trough owing to a possible original bend in the course of the dextral structure. The present course of the North Anatolian Fault in the Sea of Marmara originated some 2 x 10(5) a ago, by cutting across the older basin fabric generated by a dominant NNE-SSW extension before it began taking up major motion in the Pliocene. (C) 2001 Published by Elsevier Science B.V.

PubMed ID: 28862488, We investigated carbohydrate residues on the epithelial surface, in the epithelial cells and in gland cells of the tongue of the mole rat using histochemical methods. We used horseradish peroxidase-conjugated lectins from Helix pomatia (HPA), Arachishypogaea (PNA), Ulexeuropaeus (UEA I), Canavaliaensiformis (Con A). The most intense reactivity was observed in the keratin layer with HPA, UEA I and Con A, and in the epithelial cells with UEA I and Con A. In the glands, we found strong reactivity in serous cells with HPA and Con A, and in mucous cells with HPA and UEA I. PNA did not bind to epithelial or gland cells. Consequently, GlcNAc, fucose and ?-D-mannose terminal glycoconjugates are distributed widely; GalNAc terminal glycoconjugates appeared in small amounts. © 2017 The Biological Stain Commission.

Yari kapali Marmara Denizi, Ege Denizi (Kuzeydogu Akdeniz) ve Karadeniz arasindaki bir gecis denizidir. Marmara Denizi, sirasiyla Istanbul Bogazi (Bosporus) ve Canakkale Bogazi (Dardanelles) ile Karadeniz ve Ege Deniz’lerine baglantilidir. Denizler arasindaki, Gec Pleistosen-Holosen donemi baglantilari pek cok bilim adami tarafindan arastirilmasina ragmen, baglantilarin dogasi ve zamanlamasi konusunda hala belirsizlikler suregelmektedir. Bu calisma kapsaminda, Karadeniz, Marmara Denizi ve Ege Denizi arasindaki Buzul Sonrasi donemde meydana gelen baglantilar icin yeni bir yaklasim sergilenmektedir.Bu calisma, Marmara Denizi'nin kuzeydogu selfinde (Silivri ile Halic arasinda) toplanan 80 adet sig sismik yansima profiline, cok isinli batimetrik verilerine ve 15 adet kisa agirlikli karot verilerine dayanmaktadir. Buyukcekmece / Kucukcekmece lagunlerinin Marmara Denizi ile baglanti ve daha doguda Marmara-Istanbul Bogazi etkilesim alanlarinda, deniz tabani ve akustik taban morfolojileri, cok karmasik bir yapiya sahiptirler. Bu karmasik deniz tabani ve akustik taban morfolojileri, temel olarak havzanin yapisi, selfin mevcut hidrografik rejimi, kiyi drenaj sistemleri, deniz/gol su seviyesi degisiklikleri (iklimin kontrol ettigi) ve bogazlarin derinlikleri tarafindan kontrol edilmektedir. Ayni zamanda, tum bu faktorlerin denizler arasindaki su alis verisini kontrol eden onemli faktorler oldugu dusunulmektedir.Sismik yansima profillerinin ve agirlikli karot verilerinin sedimantolojik olarak incelenmesi sonucunda, akustik taban uzerinde, bes farkli stratigrafik birimin (S1-S5) ve dort farkli sedimanter katmanin (A-D) ayirt edilmistir. Akustik taban uzerinde yer alan alt stratigrafik birimler ve sedimanter tabakalar, karmasik, paralel ve yuksek genlikli sismik yansimalarla ayirt edilmistir. Akustik tabana ait tabakalarin deniz yonune dogru dalma gostermesi, karada yaygin olarak gorulen Oligosen-Ust Miyosen birimlerinin deniz tabaninda da devam etmekte oldugununun bir kanitidir. Marmara Denizi'nin kuzeydogu selfinde yer alan akustik taban yuzeyinde ayirt edilen uc farkli deniz taracasi (T1-T3) buzul sonrasi donemdeki kuresel deniz seviyesi degisimlerine ait alti farkli egri ile iliskilendirilmistir. Istatistiksel acidan, en belirgin taracalarin -78 m ila -80 m (T1), -58 m ila -62 m (T2) ve -28 ila -32 m (T3) arasinda yer aldigi saptanmistir. Kuresel deniz seviyesi egrileri goz onune alindiginda, bu taracalarin yaslari sirasiyla, 9.25, 12.25 ve 13.75 Cal kyr BP olarak tarihlendirilmistir.

To investigate the onshore/offshore structural framework of the northern shelf of the Sea of Marmara, a multidisciplinary study was carried out including multichannel and single-channel seismic reflection profiling, multibeam bathymetry sounding, side-scan sonar imaging on offshore as well as land studies for S-wave velocity estimation by passive and active array measurements and monitoring of block deformations by Global Positioning System (GPS). Based on the multidisciplinary data, possible interactions between landslides and active faulting have been reviewed and their possible relation to the North Anatolian Fault Zone (NAFZ) has been discussed. It is observed that structurally the most deformed subsurface zone offshore coincides with the most undulated landform due to landslides in the area. This observation leads to idea that the structural complexities of the area may also contribute to land sliding as much as other contributing mechanisms such as slope instability, shallow groundwater level, lithology and liquefaction. The Catalca Fault Zone, a branch of the inactive Western Black Sea (WBS) Fault, may constitute weakness surfaces that contribute to land sliding in the deformed Miocene layers in the study area. Based on the multidisciplinary and new data sets, we show that ongoing land sliding in the study area should be related not only to common causes of landslides but also the structural framework of the area.