Seasonal temperatures from δ 18 O in recent Spanish tufa stromatolites: Equilibrium redux!
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چکیده
منابع مشابه
Body temperatures of modern and extinct vertebrates from (13)C-(18)O bond abundances in bioapatite.
The stable isotope compositions of biologically precipitated apatite in bone, teeth, and scales are widely used to obtain information on the diet, behavior, and physiology of extinct organisms and to reconstruct past climate. Here we report the application of a new type of geochemical measurement to bioapatite, a "clumped-isotope" paleothermometer, based on the thermodynamically driven preferen...
متن کاملComparison of δ(13)C and δ(18)O from cellulose, whole wood, and resin-free whole wood from an old high elevation Pinus uncinata in the Spanish central Pyrenees.
δ(13)C and δ(18)O values from sapwood of a single Pinus uncinata tree, from a high elevation site in the Spanish Pyrenees, were determined to evaluate the differences between whole wood and resin-free whole wood. This issue is addressed for the first time with P. uncinata over a 38-year long period. Results are also compared with published isotope values of α-cellulose samples from the same tre...
متن کاملCombining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ(15)N, δ(18)O) of Dissolved Nitrate.
We present a novel approach for nitrogen (δ(15)N) and oxygen (δ(18)O) isotopic analysis of nitrate in water based on the isotopic analysis of N2O produced from the conversion of NO3(-) by cultured denitrifying bacteria and off-axis integrated cavity output spectroscopy (OA-ICOS). The headspace N2O was manually injected into an OA-ICOS isotopic N2O laser analyzer through a syringe septum port. S...
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Dementia is defined as significant acquired cognitive impairment in one or more cognitive domains that represents a significant decline from previous baseline and interferes with independence in daily activities. Autoimmune dementia is a term that has been used to describe a steroid-responsive autoimmune disorder characterized by a rapidly progressive dementia with a fluctuating course. Even co...
متن کاملSeasonal variation in natural abundance of 2 H and 18 O in urine samples from rural Nigeria Justin
Justin E. Harbison, Lara R. Dugas, William Brieger, Bamidele O. Tayo, Tunrayo Alabi, Dale A. Schoeller, and Amy Luke Division of Epidemiology, Department of Public Health Sciences, Loyola University School of Medicine, Maywood Illinois; Department of International Health, Bloomberg School of Public Health, John Hopkins University, Baltimore Maryland; Geospatial Laboratory, Research for Developm...
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ژورنال
عنوان ژورنال: Sedimentology
سال: 2018
ISSN: 0037-0746,1365-3091
DOI: 10.1111/sed.12440