Events List

DateEvent TypeSpeaker
04/02/2024Astro SeminarThales Gutcke [ + ]
04/02/2024Grad Pheno Journal Club [ + ]
04/03/2024ArXiv DiscussionHEP/Pheno Journal Club [ + ]
04/03/2024HEP SeminarTaewook Youn [ + ]
04/04/2024Physics Dept ColloquiumItai Cohen [ + ]
04/05/2024HEP Discussion SessionsZare [ + ]
04/09/2024Astro SeminarMatthew McQuinn [ + ]
04/10/2024Special SeminarOr Graur [ + ]
04/10/2024HEP SeminarClifford Cheung [ + ]
04/11/2024Physics Dept ColloquiumKaren Kasza [ + ]
04/12/2024HEP Discussion SessionsZare [ + ]
04/16/2024Grad Pheno Journal Club [ + ]
04/17/2024ArXiv DiscussionHEP/Pheno Journal Club [ + ]
04/17/2024HEP SeminarDeog Ki Hong [ + ]
04/17/2024Cosmic Happy HourTony Zhou [ + ]
04/18/2024Informal HEP TalkThomas Faulkner [ + ]
04/18/2024Physics Dept ColloquiumJohn Eiler [ -- ]

Title: Body Temperature of Dinosaurs
Abstract: The study of life’s origin, evolution and distribution in the universe involves many questions that seem unsolvable on first inspection; a familiar example concerns the body temperatures of the dinosaurs: Should we look at their fossilized skeletons and imagine vigorous, warm-blooded, bird-like animals, or plodding, sedentary reptiles like modern alligators? This question has often been approached through qualitative arguments based on phylogeny, histology, ecology and other loose correlatives with metabolism — disappointing if you want the kind of direct and quantitative data a veterinarian might gather with a well-aimed thermometer. Recent advances in studies of the chemical physics of isotopes has provided surprisingly nuanced and precise answers to this question. Well-preserved tooth enamel and egg shells of dinosaurs and other ancient vertebrates contain carbonate groups (CO3-2) that were drawn from their host’s blood stream and represent fossil remnants of their metabolic chemistry. The heavy rare isotopes, 13C and 18O, are present as trace substitutions in these carbonate groups, in amounts that reflect a variety of factors, such as diet and local climate. But the state of organization of those rare isotopes — their propensity to ‘stick’ to one another with a shared chemical bond as opposed to being randomly scattered across a population of molecules — is controlled by the temperature dependent changes in vibrational energy caused by isotopic substitution. I will present the latest discoveries revealed by exceptionally sensitive and precise measurements of isotopic ordering in fossils of ancient vertebrates, revealing their body temperatures and informing inferences regarding their metabolism, physiology, lifestyle and ecology. (4:00 PM - 5:30 PM, 726 Broadway, 940, CCPP Seminar)
04/19/2024Informal HEP TalkEdward Mazenc [ + ]
04/19/2024Special SeminarJohn Eiler [ + ]
04/19/2024HEP Discussion SessionsZare [ + ]
04/22/2024CCPP Brown BagDavid Hogg [ + ]
04/23/2024Astro SeminarNikhil Padmanabhan [ + ]
04/23/2024Grad Pheno Journal Club [ + ]
04/24/2024HEP SeminarT Daniel Brennan [ + ]
04/25/2024Oral DefenseNick Faucher [ + ]
04/25/2024Physics Dept ColloquiumDavid Awschalom [ + ]
04/29/2024CCPP Brown BagGiovanni Verza [ + ]
04/30/2024Astro SeminarAnna Suliga [ + ]
04/30/2024Grad Pheno Journal Club [ + ]