Isolation of Uranium and Thorium for Age Determination of Fossil Bones by Uranium Series Method

1991 ◽  
Vol 54 (2) ◽  
Author(s):  
E. Wild ◽  
I. Steffen
Keyword(s):  
Age Determination ◽  
Series Method ◽  
Uranium Series ◽  
Fossil Bones

scholarly journals Age Determination of Fossil Bones from the Vindija Neanderthal Site in Croatia

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 1021-1028 ◽  
Author(s):  
Eva Maria Wild ◽  
Maja Paunovic ◽  
Gernot Rabeder ◽  
Ilse Steffan ◽  
Peter Steier
Keyword(s):  
Age Determination ◽  
System Behavior ◽  
Cave Bear ◽  
Amino Acid Racemization ◽  
Sediment Profile ◽  
Fossil Bones ◽  
Closed Systems ◽  
Sediment Layers ◽  
Evolutionary Mode

Vindija cave in Croatia is famous for the Neanderthal bones found in layer G of its sediment profile. Radiocarbon dating has been performed mainly on this layer due to the great interest in its fossils. In addition to Neanderthal remains, the sediment in layer G contains bones from the cave bear. Cave bear bones are found also in other layers of the sediment profile and offer the possibility of studying the bears' evolutionary mode. Therefore, we tried to determine the time span covered by the entire profile. The U/Th age determination method was applied to cave bear bones from different layers of the profile. For the younger part of the profile, the U/Th ages were compared with the results of the 14C and the amino-acid racemization method. The agreement of the different methods indicates that closed-system behavior can be assumed for the fossil bones from Vindija cave. From this finding it may be deduced that bones from the lower sediment layers are also closed systems and that the U/Th ages of these layers are reliable. This conclusion is corroborated by the stratigraphy of the cave profile.

Dating of impure carbonates – Utilizing laser ablation MC-ICPMS to reconstruct initial 230Th/232Th ratios

2020 ◽  
Author(s):  
Julius Förstel ◽  
Sophie Warken ◽  
Andrea Schröder-Ritzrau ◽  
Norbert Frank
Keyword(s):  
Laser Ablation ◽  
Correction Term ◽  
Age Determination ◽  
Systematic Errors ◽  
Individual Measurement ◽  
Uranium Series ◽  
Heterogeneous Samples ◽  
Uranium Series Dating ◽  
Measurement Laser

<p><span>Uranium series dating is a valuable and well-established tool for age determination of carbonates in paleoclimatology. However, detrital contamination can alter results. A correctional term is commonly used to account for additional Th introduced into the sample material as detritus. </span><span>This correction requires to make assumptions about the initial </span><sup><span>230</span></sup><span>Th/</span><sup><span>232</span></sup><span>Th ratio of the detrital material, since it is not possible to extract it from an individual measurement. Laser ablation multi collector ICPMS equipped with multiple ion counting detectors offers the possibility to use an isochrone technique to extract the initial </span><sup><span>230</span></sup><span>Th/</span><sup><span>232</span></sup><span>Th value from heterogeneous samples with a high detrital content. This decreases systematic errors and uncertainties introduced by the detrital correction term and therefore improves the possibility of dating impure carbonates.</span></p>

Analysis of Fibronectin and TGF-β1 Immunoexpression to Determination of Wound Vitality in Wistar Rats (Rattus norvegicus)

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Nita Novita ◽  
Hasrayati Agustina ◽  
Bethy S. Hernowo ◽  
Abdul H. Hassan
Keyword(s):  
Rattus Norvegicus ◽  
Wistar Rats ◽  
Age Determination ◽  
Scientific Field ◽  
Wound Age ◽  
Forensic Practice ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Tgf Β1

Wound examination is indispensable in forensic practice. The scientific field of wound age determination has advanced progressively during recent years.The purpose of this study was to determine the differences of fibronectin and TGF-β1 expression in both antemortem and postmortem wounds. This study was an experimental with completely randomized design.  The skin wounds (vital and postmortem) were taken from fourty Wistar rats and divided into 10 groups of rats. Immunohistochemical staining was performed to determine the differences between antemortem and postmortem wounds. The result showed that in 30 minutes after antemortem wound infliction, all of samples showed weak reactivity for fibronectin and TGF-β1 (100%).  In first hour after wound infliction, 3 samples (75%) showed weakly positive and 1 sample (25%) strongly positive for fibronectin and TGF-β1.  In 2 hour after wound infliction, 1 sample (25%) showed weakly positive and 3 sample (75%) strongly positive for fibronectin and TGF-β1.  In 3 and 4 hour after wound infliction, all of samples strongly positive for fibronectin and TGF-β1.  In postmortem wound, all of samples showed negativity for fibronectin and TGF-β1. In conclusion, fibronectin and TGF-β1 may be useful in the determination of wound vitality. Keywords: wound, fibronectin, TGF-β1, vitality

scholarly journals Directly ageing the Caribbean spiny lobster, Panulirus argus with validated band counts from gastric mill ossicles

2018 ◽  
Vol 76 (2) ◽  
pp. 442-451 ◽  
Author(s):  
Gaya Gnanalingam ◽  
Mark J Butler ◽  
Thomas R Matthews ◽  
Emily Hutchinson ◽  
Raouf Kilada
Keyword(s):  
Spiny Lobster ◽  
Age Determination ◽  
Florida Keys ◽  
Panulirus Argus ◽  
Gastric Mill ◽  
Coefficients Of Variation ◽  
The Caribbean ◽  
First Time ◽  
Reader Experience

Abstract In crustaceans, ecdysis was long believed to result in the loss and replacement of all calcified structures, precluding the use of conventional ageing methods. However, the discovery of bands in the gastric ossicles of several crustaceans with some correlation with age suggests that direct age estimation may be possible. We applied this method to a tropical spiny lobster, Panulirus argus, one of the most iconic and economically valuable species in the Caribbean. The presence of growth bands was investigated using wild lobsters of unknown age and was validated with captive reared lobsters of known age (1.5–10 years) from the Florida Keys, Florida (USA). Bands were consistently identified in ptero- and zygo-cardiac ossicles of the gastric mill and did not appear to be associated with moulting. Validation with known age animals confirms that bands form annually. Counts between independent readers were reproducible with coefficients of variation ranging from 11% to 26% depending on reader experience and the structure used. This study demonstrates, for the first time, that direct age determination of P. argus is possible.

Using the isotope dating of endocontact hybrid rocks for the age determination of mafic rocks (southern Siberian craton)

2013 ◽  
Vol 54 (11) ◽  
pp. 1340-1351 ◽  
Author(s):  
D.P. Gladkochub ◽  
T.V. Donskaya ◽  
M.T.D. Wingate ◽  
A.M. Mazukabzov ◽  
S.A. Pisarevsky ◽  
...  
Keyword(s):  
Siberian Craton ◽  
Age Determination ◽  
Mafic Rocks ◽  
Isotope Dating
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