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Lkhagvasuren, Davaa,Ansorge, Hermann,Samiya, Ravchig,Schafberg, Renate,Stubbe, Anne,Stubbe, Michael The National Institute of Biological Resources 2013 Journal of species research Vol.2 No.1
Based on 440 skulls recently collected from two areas of the wild ass population in Mongolia, the time course of tooth eruption and replacement was investigated. The dentition pattern allows identification of age up to five years. We also conclude that annual lines in the tooth cementum can be used to determine the age in years for wild asses older than five years after longitudinal tooth sections were made with a low-speed precision saw. The first upper incisor proved to be most suitable for age determination, although the starting time of cement deposition is different between the labial and lingual sides of the tooth. The accurate age of the wild ass can be determined from the number of annual lines and the time before the first formation of the cementum at the respective side of the tooth.
Mohamed A. Aboamer,Ahmed A. Aboamer,Doaa H. Elgohary,Tarek M. Alqahtani,Ahmed Abdel-Hadi,Samiya M. Al-Mutairi,Tarek M. El-Bagory,Khaled M. Alshareef,Nader A. Rahman Mohamed 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
The aim of this research is to investigate the sterilizing effect of UVB radiation on the degradation and oxidation of low- and high-density polyethylene specimens using ASTM 638 and 695. Polyethylene is a reliable, efficient, and low-cost biomaterial and an alternative to various bone transplants. Twenty high-density polyethylene (HDPE) specimens and twenty low-density polyethylene (LDPE) specimens were used for tensile and compression testing. The dosage of 13.5 J/cm 2 was chosen with an exposure time of 48 minutes during the sterilization process. In terms of mechanical tensile properties, LDPE has a lower effect compared with HDPE. The p-value of yield stress equals 3.008×10 -4 , the p-value of ultimate stress equals 2.5×10 -4 , and the p-value of break stress equals 0.0075.