@CONFERENCE{MTMT:34834799, title = {Improving the long-term Δ47 reproducibility of the Thermo Scientific 253 Plus 10 kV IRMS using a prototype Peltier cooling device}, url = {https://m2.mtmt.hu/api/publication/34834799}, author = {Rinyu, László and Czébely, Andrea and Kiss, D and Kele, Sándor and Túri, Marianna}, booktitle = {EGU General Assembly 2024 : abstracts}, doi = {10.5194/egusphere-egu24-10068}, unique-id = {34834799}, year = {2024}, orcid-numbers = {Czébely, Andrea/0000-0002-6439-2977; Kele, Sándor/0000-0002-8607-7636} } @CONFERENCE{MTMT:34752558, title = {Clumped isotope temperatures from secondary carbonates in loess: comparability of different preparation methods of snail shells and earthworm biospheroids}, url = {https://m2.mtmt.hu/api/publication/34752558}, author = {Czébely, Andrea and Túri, Marianna and Kiss, D and Újvári, Gábor and Kertész, Gréta Titanilla and Rinyu, László}, booktitle = {EGU General Assembly 2024 : abstracts}, doi = {10.5194/egusphere-egu24-16279}, unique-id = {34752558}, year = {2024}, orcid-numbers = {Czébely, Andrea/0000-0002-6439-2977; Újvári, Gábor/0000-0002-2816-6155} } @article{MTMT:34610917, title = {Summiting Mount Everest in deuterium depleting nutritional ketosis without supplemental oxygen}, url = {https://m2.mtmt.hu/api/publication/34610917}, author = {Boros, László G. and Seneff, Stephanie and Lech, James C. and Túri, Marianna and Répás, Zoltán}, doi = {10.1016/j.mehy.2024.111290}, journal-iso = {MED HYPOTHESES}, journal = {MEDICAL HYPOTHESES}, volume = {184}, unique-id = {34610917}, issn = {0306-9877}, abstract = {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.}, year = {2024}, eissn = {1532-2777} } @article{MTMT:34180795, title = {Comparison of different preparation methods for oxygen isotope determination of phosphate in mammal tooth enamel}, url = {https://m2.mtmt.hu/api/publication/34180795}, author = {Kiss, Gabriella Ilona and Szabó, Péter and Túri, Marianna and Futó, István and Kovács, János and Palcsu, László}, doi = {10.1556/24.2023.00132}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {65}, unique-id = {34180795}, issn = {1788-2281}, abstract = {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.}, year = {2023}, eissn = {1789-3348}, pages = {144-157}, orcid-numbers = {Szabó, Péter/0000-0003-0827-3583; Kovács, János/0000-0001-7742-5515} } @CONFERENCE{MTMT:34161316, title = {KAPCSOLT IZOTÓP TERMOMETRIA: MINTAELŐKÉSZÍTÉSI MÓDSZEREK ÉS MÉRÉSI EREDMÉNYEK ÖSSZEHASONLÍTHATÓSÁGA A DUNASZEKCSŐI LÖSZ-PALEOTALAJ SZELVÉNY CSIGAHÉJ- ÉS BIOSZFEROID-KARBONÁT VIZSGÁLATAI ALAPJÁN}, url = {https://m2.mtmt.hu/api/publication/34161316}, author = {Czébely, Andrea and Túri, Marianna and Kiss, D and Újvári, Gábor and Rinyu, László}, booktitle = {13. Kőzettani és Geokémiai Vándorgyűlés}, unique-id = {34161316}, year = {2023}, pages = {3-4}, orcid-numbers = {Czébely, Andrea/0000-0002-6439-2977; Újvári, Gábor/0000-0002-2816-6155} } @CONFERENCE{MTMT:33828766, title = {New estimation to the turnover time of Lake Ohrid. an environmental isotope and noble gas study}, url = {https://m2.mtmt.hu/api/publication/33828766}, author = {Túri, Marianna and Temovski, Marjan and Kiss, Gabriella Ilona and Csige, István and Palcsu, László}, booktitle = {EGU General Assembly 2023: Abstracts}, doi = {10.5194/egusphere-egu23-13702}, unique-id = {33828766}, year = {2023} } @CONFERENCE{MTMT:33573745, title = {ICER carbonate clumped isotope analysis of karst deposits}, url = {https://m2.mtmt.hu/api/publication/33573745}, author = {Túri, Marianna and Czébely, Andrea and Diána, Kiss and Temovski, Marjan and Palcsu, László and Rinyu, László}, booktitle = {Climate Change: The Karst Record IX (KR9)}, unique-id = {33573745}, year = {2022}, pages = {164} } @{MTMT:33550052, title = {Insight into hydrothermal speleogenesis from combined use of conventional and clumped carbonate stable isotope analysis of cave walls and secondary calcite deposits}, url = {https://m2.mtmt.hu/api/publication/33550052}, author = {Temovski, Marjan and Rinyu, László and Futó, István and Molnár, Kata and Túri, Marianna and Demény, A. and Otoničar, B. and Dublyansky, Y. and Audra, P. and Polyak, V. and Asmerom, Y. and Palcsu, László}, booktitle = {SPELEOLOGY * within International Year of Caves and Karst}, unique-id = {33550052}, year = {2022}, pages = {130}, orcid-numbers = {Molnár, Kata/0000-0001-6993-5806} } @misc{MTMT:33187041, title = {Laboratory inter-comparison: cross-measurement of naturally formed travertine samples}, url = {https://m2.mtmt.hu/api/publication/33187041}, author = {Rinyu, László and Túri, Marianna and Kiss, Diána and Czébely, Andrea and Kele, Sándor and Palcsu, László}, unique-id = {33187041}, year = {2022} } @CONFERENCE{MTMT:33187026, title = {Laboratory inter-comparison: cross-measurement of naturally formed travertine samples}, url = {https://m2.mtmt.hu/api/publication/33187026}, author = {Rinyu, László and Túri, Marianna and Kiss, Diána and Czébely, Andrea and Kele, Sándor and Palcsu, László}, booktitle = {Abstract Booklet 8th International Clumped Isotope Workshop Jerusalem}, unique-id = {33187026}, year = {2022}, pages = {37} }