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Percolation thresholds in temperature dependence of electric conductivity of collagen films

100%
Gauza M., Kubisz L.
Polish Journal of Medical Physics And Engineering
|
2009
|
vol. 15
|
issue 4
183-191
EN
Temperature measurement of electrical conductivity s were carried out from 395 to 543 K. The obtained dependence indicates an increase in s. The temperature dependence of the electrical conductivity allowed to observe the release of the free water, bound water and structural water. Studies on electric conductivity of collagen indicate the occurrence of percolation threshold, which comprises free release of water and change its properties from semiconducting to dielectric one.
2
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The influence of low temperatures on dynamic mechanical properties of animal bone

81%
Mardas M., Kubisz L., Mielcarek S., Biskupski P.
Polish Journal of Medical Physics And Engineering
|
2009
|
vol. 15
|
issue 3
153-159
EN
Different preservation methods are currently used in bone banks, even though their effects on allograft quality are not fully understood. Freezing is one of the most popular methods of preservation in tissue banking. Yet, there is not a lot of data on dynamic mechanical properties of frozen bone. Material used in this study was femoral bones from adult bovine that were machine cut and frozen to the temperature 140°C. Both elastic modulus and loss modulus were measured at 1, 3, 5, 10, and 20 Hz in the temperature range of 30-200°C. Differences between frozen and control samples were observed. The frequency increase always led to the increase in elastic modulus values and decrease in loss modulus values. Freezing reduced the elastic modulus values of about 25% and the loss modulus values of about 45% when measured at 20°C.
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