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Systematic experiments on the stability and degradation of DNA in dried tissue samples during long term storage are rare.
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Firstly, this would allow direct comparison with previous studies [25,27] that reported Si levels in connective tissues (as per gramme wet weight of tissue) and secondly, it avoids (i) the pitfalls in drying tissues consistently and without introducing contaminant Si and (ii) the potential errors in handling the very low mass of dried tissues.
Pieces of dried tissue were hydrolysed in 6 N HCl at 120 °C for 18 h in sealed tubes.
Total P was extracted from approx. 10 to 20 mg of dried tissue by digesting in 3 ml HNO3 at 100°C for 10 min.
Zn is essentially required by plants in minute quantities (25 150 µg/g) in dry tissue (Jung 2008) and the level of Zn in agricultural products should be below 200 µg/g and the dietary intake of Zn should not be above 150 µg/g (Alia et al. 2015; Jung 2008).
The answer selected by the largest number (37.7%) of first-year respondents was to "wrap it in dry tissue paper".
Most the largest number of respondents believed that the best way to transport an avulsed tooth to the dental clinic was to "wrap it in dry tissue paper".
Clinically significant hepatic iron overload was defined by MRI T2* values less than 6.3 ms, corresponding to a liver iron concentration in dry tissue (LIC dry weight) of 4.2 mg/g [ 29, 30].
Moreover, most the largest number of respondents believed that the best way to transport an avulsed tooth to the dental clinic was to "wrap it in dry tissue paper", suggesting that they did not know that an avulsed tooth must not be dried because the risk of ankylosis increases significantly with an extraoral drying time of 20 minutes [ 10, 15, 27, 28].
During the testing process at room temperature, dipsticks were incubated in diluted serum for 30 min, washed 2×, incubated for 30 min with secondary antibody, washed 3×, and incubated in substrate solution for 1 min. Finally, dipsticks were washed in water, dried on tissue paper, and examined for specific reaction.
The results were expressed as counts per sec (in each mg of dry tissue).
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