Results 21 to 30 of about 15,696 (309)

Beginsels en metodes vir die bepaling van die ouderdom van hominied fossiele en hulle vindplekke

Koers : Bulletin for Christian Scholarship, 2006
Principles and methods used for the determination of the age of hominid fossils and their discovery sites Paleoanthropologists have an array of physical dating methods developed by researchers in the physical sciences.
W.J. van Aardt
doaj   +1 more source

Forensic Analysis of Time Markers of Digital Recordings

Теория и практика судебной экспертизы, 2021
The article presents the results of summarizing expert practice on the examination of the features of digital video and sound recordings, which make it possible to determine the time of file creation and date of the recorded events. The author introduces
S. M. Petrov
doaj   +1 more source

Middle Neolithic Absolute Dating In North Croatia – New Research

Studia Universitatis Hereditati, 2018
Over the last 15 years, new research brought to light several new key pieces of information regarding the middle Neolithic in north Croatia. For the first time the LBK site Donji Miholjac – Vrancari was excavated south of Drava river which lead to the ...
Katarina Botić
doaj   +1 more source

Validation of gestational age determination from ultrasound or a metabolic gestational age algorithm using exact date of conception in a cohort of newborns conceived using assisted reproduction technologiesAJOG MFM at a Glance

AJOG Global Reports, 2022
BACKGROUND: Accurate estimates of gestational age in pregnancy are important for the provision of optimal care. Although current guidelines generally recommend estimating gestational age via first-trimester ultrasound measurement of crown–rump length ...
Steven Hawken, PhD, Brieanne Olibris, PhD, Robin Ducharme, MSc, A. Brianne Bota, PhD, Jeffrey C. Murray, MD, Beth K. Potter, PhD, Mark Walker, MD, Pranesh Chakraborty, MD, Kumanan Wilson, MD   +8 more
doaj   +1 more source

Radiocarbon dating of glacier ice: overview, optimisation, validation and potential [PDF]

The Cryosphere, 2016
High-altitude glaciers and ice caps from midlatitudes and tropical regions contain valuable signals of past climatic and environmental conditions as well as human activities, but for a meaningful interpretation this information needs to be placed in a ...
C. Uglietti, A. Zapf, T. M. Jenk, M. Sigl, S. Szidat, G. Salazar, M. Schwikowski   +6 more
doaj   +1 more source

Weakly Bonded Water in Interstitial Sites: A Source of Inaccuracy in Rehydroxylation Dating

Applied Sciences
The rehydroxylation (RHX) dating technique offers a promising method for determining the ages of ceramic materials, leveraging the time-dependent mass gain from water reabsorption after high-temperature firing.
Marco Martini, Anna Galli, Laura Panzeri, Francesco Maspero   +3 more
doaj   +1 more source

THREE BRONZE AXES WITH WOODEN HAFT RE-MAINS FROM ESTONIA; pp. 3–19 [PDF]

Eesti Arheoloogiaajakiri, 2018
Estonian Bronze Age bronze artefacts are almost always discovered as stray finds without a datable context or associated samples that would enable absolute dating. Their age estimates are based on better dated parallels from elsewhere in Europe.
Kristiina Paavel, Aivar Kriiska, Valter Lang, Alexander Kulkov   +3 more
doaj   +1 more source

Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE

Nature Communications, 2018
Despite their extensive use, the absolute dating of tree-ring chronologies has not hitherto been independently validated at the global scale. Here, the identification of distinct 14C excursions in 484 individual tree rings, enable the authors to confirm ...
Ulf Büntgen, Lukas Wacker, J. Diego Galván, Stephanie Arnold, Dominique Arseneault, Michael Baillie, Jürg Beer, Mauro Bernabei, Niels Bleicher, Gretel Boswijk, Achim Bräuning, Marco Carrer, Fredrik Charpentier Ljungqvist, Paolo Cherubini, Marcus Christl, Duncan A. Christie, Peter W. Clark, Edward R. Cook, Rosanne D’Arrigo, Nicole Davi, Ólafur Eggertsson, Jan Esper, Anthony M. Fowler, Ze’ev Gedalof, Fabio Gennaretti, Jussi Grießinger, Henri Grissino-Mayer, Håkan Grudd, Björn E. Gunnarson, Rashit Hantemirov, Franz Herzig, Amy Hessl, Karl-Uwe Heussner, A. J. Timothy Jull, Vladimir Kukarskih, Alexander Kirdyanov, Tomáš Kolář, Paul J. Krusic, Tomáš Kyncl, Antonio Lara, Carlos LeQuesne, Hans W. Linderholm, Neil J. Loader, Brian Luckman, Fusa Miyake, Vladimir S. Myglan, Kurt Nicolussi, Clive Oppenheimer, Jonathan Palmer, Irina Panyushkina, Neil Pederson, Michal Rybníček, Fritz H. Schweingruber, Andrea Seim, Michael Sigl, Olga Churakova (Sidorova), James H. Speer, Hans-Arno Synal, Willy Tegel, Kerstin Treydte, Ricardo Villalba, Greg Wiles, Rob Wilson, Lawrence J. Winship, Jan Wunder, Bao Yang, Giles H. F. Young   +66 more
doaj   +1 more source

The anti‐CRISPR protein AcrIE8.1 inhibits the type I‐E CRISPR‐Cas system by directly binding to the Cascade subunit Cas11

FEBS Letters, EarlyView.
In this study, we present the structure of AcrIE8.1, a previously uncharacterized anti‐CRISPR protein that inhibits the type I‐E CRISPR‐Cas system. Through a combination of structural and biochemical analyses, we demonstrate that AcrIE8.1 directly binds to the Cas11 subunit of the Cascade complex to inhibit the CRISPR‐Cas system.
Young Woo Kang, Hyun Ho Park
wiley   +1 more source

New archaeological data refering to Tărtăria tablets

Documenta Praehistorica, 2005
We analyze and present new points of view regarding the ‘Danube’ script based on recent investigations of the old Tărtăria discoveries: archaeological context, anthropological expertise, absolute dating and the meaning of the renowned tablets.
Gheorghe Lazarovici, Marco Merlini
doaj   +1 more source