scholarly journals Age determination of fossils collected from Karabük, Safranbolu, Bulak river area by using amino acid racemization method

2018 ◽  
Vol 27 (1) ◽  
pp. 25-36
Author(s):  
KARA Sibel; ÖZDEMİR
Keyword(s):  
Amino Acid ◽  
Age Determination ◽  
Amino Acid Racemization

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.

Use of Amino Acids and Amino Acid Racemization for Age Determination in Archaeometry

2004 ◽  
pp. 65-78 ◽  
Author(s):  
J. Csapó ◽  
M. Collins ◽  
Z. Csapó-Kiss ◽  
É. Varga-Visi ◽  
G. Pohn ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Age Determination ◽  
Amino Acid Racemization

Age Determination via Measurement of Amino Acid Racemization in Dental Tissue

2017 ◽  
pp. 349-357
Author(s):  
Vikki A. Carolan ◽  
Michael L.G. Gardner ◽  
A. Mark Pollard
Keyword(s):  
Amino Acid ◽  
Age Determination ◽  
Dental Tissue ◽  
Amino Acid Racemization

Age determination based on amino acid racemization: A new possibility

Amino Acids ◽  
1994 ◽  
Vol 7 (3) ◽  
pp. 317-325 ◽  
Author(s):  
J. Csap� ◽  
Z. Csap�-Kiss ◽  
S. N�methy ◽  
S. Folestad ◽  
A. Tivesten ◽  
...  
Keyword(s):  
Amino Acid ◽  
Age Determination ◽  
Amino Acid Racemization

Polypeptides Folding: Rules for the Calculation of the Backbone Dihedral Angles φ starting from the Amino Acid Sequence

2020 ◽  
Author(s):  
Michele Larocca
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Theoretical Approach ◽  
Polypeptide Chain ◽  
Hydrophobic Effect ◽  
Side Chain ◽  
Dihedral Angles ◽  
Mechanical Forces ◽  
Specific Chemical

<p>Protein folding is strictly related to the determination of the backbone dihedral angles and depends on the information contained in the amino acid sequence as well as on the hydrophobic effect. To date, the type of information embedded in the amino acid sequence has not yet been revealed. The present study deals with these problematics and aims to furnish a possible explanation of the information contained in the amino acid sequence, showing and reporting rules to calculate the backbone dihedral angles φ. The study is based on the development of mechanical forces once specific chemical interactions are established among the side chain of the residues in a polypeptide chain. It aims to furnish a theoretical approach to predict backbone dihedral angles which, in the future, may be applied to computational developments focused on the prediction of polypeptide structures.</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

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