A PALEOLIMNOLOGICAL APPROACH TO UNDERSTAND REGIME-SHIFT DYNAMICS IN LADIK LAKE (NORTH TURKEY)

peer reviewedPaleolimnological assessment of Ladik Lake (N Turkey) using diatoms was carried out along a 62 cm-long sediment core recovered from the southeastern part of the lake. The chronology of the sediments was established by137Cs ‒210Pb dating. Accordingly, three major chronostratigraphical diatom assemblage zones (DAZ) were defined by the CONISS (constrained cluster analysis) program. The oldest assemblage, DAZ C (AD 1925-1958), was dominated by Ulnaria ulna (Nitzsch) Compère, Cocconeis placentula Ehrenb. and Cocconeis pediculus Ehrenb. taxon. In DAZ B (AD 1958-1986), in addition to Ulnaria ulna species that dominated through the whole core, Epithemia spp. occasionally dominated the assemblage in this zone. Ulnaria ulna and Pantocsekiella ocellata (Pant.) K.T. Kiss & Ács predominated since the beginning of DAZ A (AD 1986-2006). After the first regime of the lake with dystrophic character, the diatom community underwent a significant shift, with decreased abundance of periphytic diatom samples. The improvement of the regulator in 1986 resulted in a larger water level increase that affected the lake ecology, causing a shift from a diverse periphytic diatom to planktonic diatom assemblage. Based on our monitoring it can be inferred that the limnological regime shifts in Ladik Lake during the 20th century are of anthropogenic origin, rather than being due to climatic changes

Correction to: Two years later: Is the SARS-CoV-2 pandemic still having an impact on emergency surgery? An international cross-sectional survey among WSES members

Background: The SARS-CoV-2 pandemic is still ongoing and a major challenge for health care services worldwide. In the first WSES COVID-19 emergency surgery survey, a strong negative impact on emergency surgery (ES) had been described already early in the pandemic situation. However, the knowledge is limited about current effects of the pandemic on patient flow through emergency rooms, daily routine and decision making in ES as well as their changes over time during the last two pandemic years. This second WSES COVID-19 emergency surgery survey investigates the impact of the SARS-CoV-2 pandemic on ES during the course of the pandemic. Methods: A web survey had been distributed to medical specialists in ES during a four-week period from January 2022, investigating the impact of the pandemic on patients and septic diseases both requiring ES, structural problems due to the pandemic and time-to-intervention in ES routine. Results: 367 collaborators from 59 countries responded to the survey. The majority indicated that the pandemic still significantly impacts on treatment and outcome of surgical emergency patients (83.1% and 78.5%, respectively). As reasons, the collaborators reported decreased case load in ES (44.7%), but patients presenting with more prolonged and severe diseases, especially concerning perforated appendicitis (62.1%) and diverticulitis (57.5%). Otherwise, approximately 50% of the participants still observe a delay in time-to-intervention in ES compared with the situation before the pandemic. Relevant causes leading to enlarged time-to-intervention in ES during the pandemic are persistent problems with in-hospital logistics, lacks in medical staff as well as operating room and intensive care capacities during the pandemic. This leads not only to the need for triage or transferring of ES patients to other hospitals, reported by 64.0% and 48.8% of the collaborators, respectively, but also to paradigm shifts in treatment modalities to non-operative approaches reported by 67.3% of the participants, especially in uncomplicated appendicitis, cholecystitis and multiple-recurrent diverticulitis. Conclusions: The SARS-CoV-2 pandemic still significantly impacts on care and outcome of patients in ES. Well-known problems with in-hospital logistics are not sufficiently resolved by now; however, medical staff shortages and reduced capacities have been dramatically aggravated over last two pandemic years

Systemic pulmonary shunt performed with Shelhigh internal mammary artery: Early results

PubMedID: 18270142Objective. The purpose of this study was to evaluate early findings for aortopulmonary shunts using bovine internal mammary artery grafting. Methods. Bovine internal mammary artery grafts biomodified with glutaraldehyde and the Shelhigh No-React process were used between May 2005 and April 2006 in our clinic for 20 cases of aorta-pulmonary artery shunts. We implanted 2 sizes of grafts, either a graft with 4-mm proximal and 5-mm distal diameters or a graft with 5-mm proximal and 6-mm distal diameters. Patients were between 20 days and 7 years of age, and the sex distribution was 55% female and 45% male. A Blalock-Taussig shunt with left thoracotomy was performed in patients 2 years of age and older, and a central shunt with sternotomy was performed for patients younger than 2 years. Eight patients underwent operation under emergency conditions. Nine patients had tetralogy of Fallot and/or pulmonary atresia (PA); 3 had transposition of the great arteries, ventricular septal defect, and pulmonary stenosis (PS); 3 had tricuspid atresia; 3 had PS and double-inlet left ventricle; and 2 had PA. Results. After the operation, immediate recovery of oxygen saturation and partial oxygen pressure was observed in all patients. Pulse oximetry measurements showed patient oxygen saturation to be between 84% and 100%. One patient underwent reoperation at the third postoperative hour because of bleeding. Two patients died from causes unrelated to the graft. The hospitalization period was between 7 and 29 days. Echocardiography evaluations showed no shunt obstruction for the early (first postoperative week) or middle (postoperative week 24) period. Conclusion. With this study, we assessed the use of the Shelhigh internal mammary artery graft instead of synthetic (polytetrafluoroethylene) tubular grafts in shunt operations for congenital heart diseases with decreased pulmonary blood flow and no evidence of calcification. Further investigation involving a larger number of cases and longer-term results for patency are needed to confirm our findings

Fauna and flora of drilling and core data from the Iznik Lake: The Marmara and the Black Sea connection

Workshop on Paleoclimatic and Paleoecological Studies in Turkey's Lakes (TURQLAKES) -- JUN 21-23, 2016 -- Ardahan Univ, Ardahan, TURKEYWOS: 000437396100015The study deals with on the Quaternary connection of the Iznik Lake between the Gemlik Gulf and the Black Sea located in the Marmara Region. The core and drilling data were evaluated. They were collected at two locations and depths from drilling cores and at the three deepest locations of the lake. A total of 510 samples were examined from the lake-bottom cores. Ostracod, mollusc, nannoplankton, ascidian spicule, and diatom assemblages observed at different levels of the drillings were studied. No foraminiferal data were recorded. Molluscan association such as Dreissena bugensis, D. caspia, Monodacna pontica, Clathrocaspia makarovi, Euxinipyrgula milachevitchi, Euxinipyrgula lincta indicate Neoeuxinian age. Amnicythere olivia, A. stepanaitysae, A. striatocostata, Tyrrhenocythere amnicola and Loxoconcha immodulata of the ostracod assemblage, exhibiting Ponto-Caspian origin, were found. In addition, fossil ascidian spicules comprising various species of Bonetia, Micrascidites, Monniotia, and Rigaudia genera were encountered, probably representing Late Pleistocene to Holocene ages. Campylodiscus echeneis, Cocconeis placentula var. lineata Epithemia turgida var. granulata, Epithemia adnata, Nitzschia commutate and N. vermicularis, from the diatom assemblage are genera and species also found in the Iznik Lake and in the Black Sea. Mollusc and ostracod fauna, the Ponto-Caspian origin indicates that the Iznik Lake was connected with the Black Sea and the Marmara Sea in the recent period. Thus, the Ponto-Caspian assemblages indicate the early Neoeuxinian (Surozhian) brackish water inundated the study area. Geochronological ages determined by the C-14 method from the deposits occurring at 53-54 m above present sea level in the Iznik Lake indicate the periods of connection via Iznik Lake during 33,630 to 32,920 cal BP (SK-1) and BP 27,335 to 27,070 cal BP (SK-2). When the position of the deposits is compared with the previously available Late Pleistocene C-14 data obtained from the molluscs identified in the nearby Gemlik Gulf at -76 m present water depth and also with the early Khazarian (Middle Pleistocene) age data on the molusc fauna at 130-150 m heights of uppermost terraces above present sea level to NW of the lake, we suggest the influence of a neo-tectonic regime for the occurrence of comparable age deposits at different levels in the region. It may be proposed that a vertical displacement in the order of a 100 m occurred since the late Pleistocene in the Iznik Lake area and the lake acquired its present features as a result of the tectonic movements. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.Turkish Acad Sc

DETERMINATION OF DIL STREAM CONTAMINATION BY BENTHIC FORAMINIFERA AND MOLLUSCS IN BAYRAMOGLU COASTS (TUZLA-ISTANBUL, TURKEY)

This study investigates the drill core 3.00 m in length obtained from DSK-3 drilling carried out in the depth of 10:00 m in the southeast of Tuzla (Istanbul) and in the northwest of Bayramoglu in order to present the marine pollution caused by Dil Stream through the instrumentality of bioindicators (foraminifera, ostracods and molluscs). The purpose of the study is to reveal the adverse conditions caused by the uncontrolled waste disposal from the industry which has been evolving for a long time around Dil Stream located in the provincial borders of Kocaeli. It is not possible under the present circumstances to do any research in the area where Dil Stream discharges into the sea. Therefore, the core obtained from the drilling carried out in Bayramoglu is analyzed by considering the flows in the western portion of Gulf of Izmit. In addition, this study also makes use of the results of the analysis of the samples collected at and around the mouth of the stream by TUBITAK in 2013 for the purpose of demonstrating the environmental pollution in the region. In conclusion, coloration and deformation of the heavy metals and benthic foraminifera which the core samples contain are determined and the adverse outcomes caused by the untreated waste discharged into Dil Stream are demonstrated

Karadeniz stok tesbiti projesi balıkçılık araştırmaları

TÜBİTAK DEBÇAG15.02.1996Bu rapor "Karadeniz Stok Tayini" projesinin başlangıç aşamasını ve bunu izleyen dönemde yürütülen balıkçılık çalışmaları ile daha önce yapılmış araştırmalarıdan çıkartılan sonuçları kapsamaktadır. Projeye destek veren Uluslararası ve Ulusal kuruluşlar olarak NATO-İstikrar için Bilim Programı (NATO-SfS), Devlet Planlama Teşkilatı (DPT), Türkiye Bilimsel be Teknik Araştırma Kurumu (TÜBİTAK), Tarım ve Köyişleri Bakanlığı (BAKANLIK) yer almaktadır. Orta Doğu Teknik Üniversitesi-Deniz Bilimleri Enstitüsü (ODTÜ-DBE) bu projeyi BAKANLIĞIN Yomra/Trabzon Su Ürünleri Araştırma Enstitüsü ile işbirliği içerisinde yürütmüştür. Proje, Türkiye'nin Karadeniz kıyısındaki ekonomik öneme haiz bazı pelajik ve demersal balık türlerinin-stok miktarlarının tahmin edilmesini hedeflemektedir. Bu hedefe ulaşmak için pelajik türlerde balıkçılık akustiği ve demersal türlerde de [taranan alan, sürekli en yüksek ürün (MSY), stoka katılan birey başına düşen ürün (Y/R) gibi ] tümsel ve durağan modeller uygulanmıştır. Ek olarak, balık pazarı örnekleri ve balık yumurta ve larvalarına yönelik sörveylerde değerlendirilmiştir

Meiofauna, microflora and geochemical properties of the late quaternary (Holocene) core sediments in the Gulf of Izmir (Eastern Aegean Sea, Turkey)

The Gulf of Izmir has seen the construction of marinas at four locations; Karsiyaka, Bayrakli, inciralti and Urla (Cesmealti). Six drilling holes have been structured for each location. Morphological abnormities observed in foraminifer tests, obtained from these core drillings, and coloring encountered in both foraminifer tests and ostracod carapeces, provide evidence of natural and unnatural environmental pollution. The objectives of this study are to identify micro and macro fauna, foraminifers in particular, contained within sediments in the above-mentioned locations; to investigate the background of pollution in the Gulf Region; and to determine pollution's impact upon benthic foraminifer and ostracods