TY - CONF AU - Rinyu, László AU - Czébely, Andrea AU - Kiss, D AU - Kele, Sándor AU - Túri, Marianna TI - Improving the long-term Δ47 reproducibility of the Thermo Scientific 253 Plus 10 kV IRMS using a prototype Peltier cooling device T2 - EGU General Assembly 2024 : abstracts PB - European Geosciences Union (EGU) C1 - Wien PY - 2024 PG - 1 DO - 10.5194/egusphere-egu24-10068 UR - https://m2.mtmt.hu/api/publication/34834799 ID - 34834799 LA - English DB - MTMT ER - TY - CONF AU - Czébely, Andrea AU - Túri, Marianna AU - Kiss, D AU - Újvári, Gábor AU - Kertész, Gréta Titanilla AU - Rinyu, László TI - Clumped isotope temperatures from secondary carbonates in loess: comparability of different preparation methods of snail shells and earthworm biospheroids T2 - EGU General Assembly 2024 : abstracts PB - European Geosciences Union (EGU) C1 - Wien PY - 2024 DO - 10.5194/egusphere-egu24-16279 UR - https://m2.mtmt.hu/api/publication/34752558 ID - 34752558 LA - English DB - MTMT ER - TY - JOUR AU - Boros, László G. AU - Seneff, Stephanie AU - Lech, James C. AU - Túri, Marianna AU - Répás, Zoltán TI - Summiting Mount Everest in deuterium depleting nutritional ketosis without supplemental oxygen JF - MEDICAL HYPOTHESES J2 - MED HYPOTHESES VL - 184 PY - 2024 PG - 5 SN - 0306-9877 DO - 10.1016/j.mehy.2024.111290 UR - https://m2.mtmt.hu/api/publication/34610917 ID - 34610917 AB - During climbing seasons in the Himalaya only a few sportsmen attempt an ascent to and descent from the 8848 m top of the Earth without supplemental oxygen. This short report describes such successful summiting of the Mount Everest that rested with the nutritional, metabolic and exercise ketosis state, i.e., the burning of long chain saturated fat as the source of cellular energy after six failed attempts by the same athlete using carbohydratebased nutrition. We herein describe the advantage of ketosis from the medical biochemistry angle by characterizing peroxisomal and mitochondrial cross talk as deuterium (heavy hydrogen) depleting principles in natural ketosis. We emphasize the importance of proton (hydrogen) and oxygen recycling via fatty acid deriving hydrogen peroxide produced in peroxisomes, followed by its conversion to metabolic water and O2 by catalase in mitochondria. Metabolic adaptation to natural ketosis maintains reduced NAD+ and ATP pools even in severely oxygen deprived environments. We hypothesize that severely decreased atmospheric oxygen pressure above 7000 m compromises alveolar gas exchange so much that biological oxidation becomes dependent on natural hydrocarbon (fat) based nutritional and consequent metabolic adaptation to natural ketosis. Such substrate level coupling of peroxisomal and mitochondrial metabolism via fatty acid breakdown aids oxygen recycling in muscles and tissues as a lifesaving option for the extreme climber. LA - English DB - MTMT ER - TY - JOUR AU - Kiss, Gabriella Ilona AU - Szabó, Péter AU - Túri, Marianna AU - Futó, István AU - Kovács, János AU - Palcsu, László TI - Comparison of different preparation methods for oxygen isotope determination of phosphate in mammal tooth enamel JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2023 IS - 2 SP - 144 EP - 157 PG - 14 SN - 1788-2281 DO - 10.1556/24.2023.00132 UR - https://m2.mtmt.hu/api/publication/34180795 ID - 34180795 N1 - Isotope Climatology and Environmental Research Centre, HUN-REN Institute for Nuclear Research, Debrecen, Hungary Doctoral School of Physics, University of Debrecen, Debrecen, Hungary Institute of Geography and Earth Sciences, University of Pécs, Pécs, Hungary Export Date: 1 January 2024 Correspondence Address: Kiss, G.I.; Isotope Climatology and Environmental Research Centre, Bem tér 18/C, Hungary; email: kiss.gabriella@atomki.hu AB - We tested several sample pre-treatment protocols for the study of oxygen isotope ratios in the phosphate phase of mammalian enamel of ten different fossil samples. We investigated the effect of different pre-treatment methods and the duration of the hydrogen fluoride treatment on enamel samples from skeletal phosphate with known δ 18 O values. The samples had been measured previously, so we could compare the ratios measured in our laboratory with the previous values to choose the best chemical preparation procedure. Four pre-soaking methods and two different time intervals of 2 mol dm −3 hydrogen fluoride treatment were compared during our experiments. In our experimental conditions, the distilled water wash and the 6 h of soaking in hydrogen fluoride gave the closest results to the expected δ -values. The steps of the tested preparation processes were repeated at least three times on each sample, so the reproducibility of the process could be also investigated. LA - English DB - MTMT ER - TY - CONF AU - Czébely, Andrea AU - Túri, Marianna AU - Kiss, D AU - Újvári, Gábor AU - Rinyu, László ED - Raucsikné Varga, Andrea Beáta TI - KAPCSOLT IZOTÓP TERMOMETRIA: MINTAELŐKÉSZÍTÉSI MÓDSZEREK ÉS MÉRÉSI EREDMÉNYEK ÖSSZEHASONLÍTHATÓSÁGA A DUNASZEKCSŐI LÖSZ-PALEOTALAJ SZELVÉNY CSIGAHÉJ- ÉS BIOSZFEROID-KARBONÁT VIZSGÁLATAI ALAPJÁN T2 - 13. Kőzettani és Geokémiai Vándorgyűlés PB - Szegedi Tudományegyetem TTIK, Ásványtani, Geokémiai és Kőzettani Tanszék CY - Szekszárd SN - 9789633069615 PY - 2023 SP - 3 EP - 4 PG - 2 UR - https://m2.mtmt.hu/api/publication/34161316 ID - 34161316 N1 - Poszter LA - Hungarian DB - MTMT ER - TY - CONF AU - Túri, Marianna AU - Temovski, Marjan AU - Kiss, Gabriella Ilona AU - Csige, István AU - Palcsu, László TI - New estimation to the turnover time of Lake Ohrid. an environmental isotope and noble gas study TS - an environmental isotope and noble gas study T2 - EGU General Assembly 2023: Abstracts PB - European Geosciences Union (EGU) C1 - München PY - 2023 DO - 10.5194/egusphere-egu23-13702 UR - https://m2.mtmt.hu/api/publication/33828766 ID - 33828766 LA - English DB - MTMT ER - TY - CONF AU - Túri, Marianna AU - Czébely, Andrea AU - Diána, Kiss AU - Temovski, Marjan AU - Palcsu, László AU - Rinyu, László TI - ICER carbonate clumped isotope analysis of karst deposits T2 - Climate Change: The Karst Record IX (KR9) PY - 2022 SP - 164 UR - https://m2.mtmt.hu/api/publication/33573745 ID - 33573745 LA - English DB - MTMT ER - TY - CHAP AU - Temovski, Marjan AU - Rinyu, László AU - Futó, István AU - Molnár, Kata AU - Túri, Marianna AU - Demény, A. AU - Otoničar, B. AU - Dublyansky, Y. AU - Audra, P. AU - Polyak, V. AU - Asmerom, Y. AU - Palcsu, László ED - Astrid, Švara ED - Nadja, Zupan Hajna ED - Franci, Gabrovšek TI - Insight into hydrothermal speleogenesis from combined use of conventional and clumped carbonate stable isotope analysis of cave walls and secondary calcite deposits T2 - SPELEOLOGY * within International Year of Caves and Karst PB - Založba ZRC CY - Ljubljana PY - 2022 SP - 130 UR - https://m2.mtmt.hu/api/publication/33550052 ID - 33550052 LA - English DB - MTMT ER - TY - GEN AU - Rinyu, László AU - Túri, Marianna AU - Kiss, Diána AU - Czébely, Andrea AU - Kele, Sándor AU - Palcsu, László TI - Laboratory inter-comparison: cross-measurement of naturally formed travertine samples PY - 2022 UR - https://m2.mtmt.hu/api/publication/33187041 ID - 33187041 LA - English DB - MTMT ER - TY - CONF AU - Rinyu, László AU - Túri, Marianna AU - Kiss, Diána AU - Czébely, Andrea AU - Kele, Sándor AU - Palcsu, László TI - Laboratory inter-comparison: cross-measurement of naturally formed travertine samples T2 - Abstract Booklet 8th International Clumped Isotope Workshop Jerusalem PY - 2022 SP - 37 UR - https://m2.mtmt.hu/api/publication/33187026 ID - 33187026 LA - English DB - MTMT ER -