Simulation of the Liesegang pattern formation in low concentration gradient is presented using concentration perturbation in a deterministic model. The precipitation process is based on ion-product supersaturation theory (Ostwald's model). In the classical experiments with high initial concentration gradients, appearance time and locations of the band formation are well reproducible. Decreasing...

Mayenite (Ca12Al14O33) is one of the most important crystalline phases in CaO–Al2O3–SiO2 based system, which common system natural geological and artificial materials. However, due to unstable structure melt, Ca12Al14O33 crystal seems be difficult precipitate as main phase its melt. Therefore, dissolution structural evolution melt were studied this work. The amount crystals significantly decrea...

Precipitates of the ordered L1(2) gamma' phase (dispersed in the face-centered cubic or FCC gamma matrix) were imaged in Rene 88 DT, a commercial multicomponent Ni-based superalloy, using energy-filtered transmission electron microscopy (EFTEM). Imaging was performed using the Cr, Co, Ni, Ti and Al elemental L-absorption edges in the energy loss spectrum. Manual and automated segmentation proce...

The yields of crystalline trypsin prepared by the original method (1) are generally far below the values to be expected if all of the trypsinogen were changed into trypsin. The specific activity of the enzyme also tends to be low. This is due to a second reaction (2) which occurs simultaneously with the transformation of trypsinogen into t iypsin--part of the trypsinogen is transformed into an ...

Abstract Dicarboxylic amino acid-based surfactants ( N -dodecyl derivatives of -aminomalonate, -aspartate, and -glutamate) in combination with hexadecyltrimethylammonium bromide (HTAB) form a variety aggregates. Composition concentration-dependent mixtures exhibit liquid crystal, gel, precipitate, clear isotropic phases. Liquid crystalline patterns, formed by surfactant mixtures, were identifie...

The junctional complex in the gill epithelium of the freshwater mussel (Elliptio complanatus) consists of an intermediary junction followed by a 2-3 micro long septate junction. Homologous and heterologous cell pairs are connected by this junction. After fixation with 1% OsO(4) containing 1% potassium pyroantimonate, electron microscopy of the gill reveals deposits of electron-opaque precipitat...

The fusion method of using ammonium phosphate salt as flux was assessed for its ability to precipitate metaphosphate compounds containing trivalent ions M3+ = Al, Cr, Fe, Ti, and V M(PO3)3 in inorganic salts a certified reference material (CRM) mineral ore sample. Fusion analysis mixtures AlCl3, CrCl3, FeCl3, VCl3 showed variable amounts precipitates isolated the order iron (12%) < vanadium ...

The synthesis of Mg-substituted copper hydroxycarbonates by constant-pH co-precipitation with subsequent ageing the precipitate has been studied in detail. This allowed retrieval crystalline magnesian malachite samples, which showed a “radical-sign-shaped” pH drop and blue/green color change during that is well-known from analogous Cu/Zn system. crystallization Cu-rich samples elaborately means...