4 research outputs found
Patterns of calcium oxalate monohydrate crystallization in complex biological systems
The paper presents the features of calcium oxalate crystallization in the presence of additives revealed through experimental modeling. The patterns of phase formation are shown for the Ca{2+} ā C[2]O[4]{ 2ā} ā H[2]O and Ca{2+} ā C[2]O[4]{2ā} ā PO[4]{3ā} ā H[2]O systems with the components and pH of the saline varying over a wide concentrations range. The effect of additives on crystallization of calcium oxalate monohydrate was investigated. It was found that the ionic strength and magnesium ions are inhibitors, and calcium oxalate and hydroxyapatite crystals are catalysts of calcium oxalate monohydrate crystallization. The basic calcium phosphate (apatite) was found to be most thermodynamically stable, which indicates its special role in kidney stone formation since it is found in virtually all stones
A method for determination of energy center of a solitary pulse
A new method is suggested for estimating the energy center of a solitary pulse. The method permits to diminish the estimate variance as compared to the same characteristic of the center-of-gravity method. The method is based on a recursive procedure of calculation of cylindrical convolution, which facilitates the implementation