An example of the companies' environmentally friendly processes was the use of eggshells
, which other producers usually discard after they use the rest of the egg to make cakes, biscuits and puff cakes.
Researchers have found an innovative way of using eggshells
to support new bone tissue growth.
Similar procedure were followed for eggshell
powder and Sensodyne paste.
This is observed as a higher minimum and maximum torque of composites containing carbon black and silica compared to composites made with eggshells
. Moreover, eggshell
particles, in addition to being bigger than carbon black and silica, also had the highest density, so a lower volume of filler was used to achieve the same weight.
As the chick grows inside the eggshell
, it needs calcium.
In modern birds, coloring on eggshells
provides camouflage or diversion so that open-nesting birds can protect their children from potential predators.
No improvement in egg quality as observed in this experiment was unexpected because increased Ca and P utilization by dietary phytase have been reported to improve egg quality, especially for eggshell
strength and thickness [20,21].
 experimentally measured the resonant frequency of an eggshell
based on a theoretical formula for the effect of the dimensions of the eggshell
and the modulus of elasticity on the resonant frequency.
The thermal treatment of the eggshell
wastes as raw material can lead to the formation of an inexpensive and environmentfriendly basic catalyst.
Keywords: chicken eggshell
, incubation, ICP-OES, elements.
Synthesis and chemical and structural characterization of hydroxyapatite obtained from eggshell
and tricalcium phosphate