The Kjeldahl method was introduced a hundred years ago as a method for determining the amount Nitrogen. Later this method has also been known in determining proteins in organic materials; even applied in determining Nitrogen in inorganic materials. This method was initially considered

Tissue regeneration is one of the most important aspects in the recovery of post-operation patients. The method of tissue regeneration has been used since more than 15 years ago, especially in Mouth surgery. At present, a process has been found that can support