Mineral dusts originating from Earth's crust are known to be important atmospheric ice nuclei. In agreement with earlier studies, feldspar was found as the most active of the tested natural mineral dusts. Here we investigated in closer detail the reasons for its activity and the difference in the activity of the different feldspars. Conclusions are drawn from scanning electron microscopy, X-ray...

A method for the preconcentration and determination of Cr(III), Co(II), Cu(II), Fe(III) and Pb(II) ions by atomic absorption spectrometry has been described. The method was based the collection of metal-calmagite complexes on a soluble cellulose nitrate membrane filter. The detection of the solution was obtained by flame atomic absorption spectrometry (FAAS) after completely dissolving the memb...

19. OVERSTREET, R. AND L. JACOBSON. 1952. Mechanism of ion absorption by roots. Ann. Rev. Plant Physiol. 3: 189-206. 20. ROTHSTEIN, A. 1959. Role of the cell membrane in the metabolism of inorganic electrolytes. Bacteriol. Rev. 23: 175-97. 21. ScoTT, G. T. 1944. Cation exchange in Chlorella pyrenoidosa. J. Cell. Comp. Physiol. 23: 47-58. 22. Scowr, G. T. 1943. The mineral composition of Chlorel...

Various nanoscale semiconducting superlattices have been generated by direct templating in a lyotropic organic liquid crystal. These include superlattices of CdS, CdSe, and ZnS, templated in a liquid crystal formed by oligoethylene oxide oleyl ether amphiphiles and water. The semiconductor growth process copied the symmetry and characteristic dimensions of the original mesophase by avoiding gro...

19. OVERSTREET, R. AND L. JACOBSON. 1952. Mechanism of ion absorption by roots. Ann. Rev. Plant Physiol. 3: 189-206. 20. ROTHSTEIN, A. 1959. Role of the cell membrane in the metabolism of inorganic electrolytes. Bacteriol. Rev. 23: 175-97. 21. ScoTT, G. T. 1944. Cation exchange in Chlorella pyrenoidosa. J. Cell. Comp. Physiol. 23: 47-58. 22. Scowr, G. T. 1943. The mineral composition of Chlorel...

Designed peptides may generate molecular scaffolds in the form of hydrogels to support tissue regeneration. We studied the effect of hydrogels comprising β-sheet-forming peptides rich in aspartic amino acids and of tricalcium phosphate (β-TCP)-loaded hydrogels on calcium adsorption and cell culture in vitro, and on bone regeneration in vivo. The hydrogels were found to act as efficient depots f...

Bisphosphonates are currently the most important class of antiresorptive agents used in the treatment of metabolic bone diseases, including tumor-associated osteolysis and hypercalcemia. These compounds have high affinity for calcium ions and therefore target bone mineral, where they are internalized by bone-resorbing osteoclasts and inhibit osteoclast function. Nitrogen-containing bisphosphona...

A macromolecular-assembly of polypeptides constructs a network of anionic and cationic charges vital for recognizing and coassembling Ca(2+) and CO(3)(2-) ions to mineralize and stabilize different mineral forms of CaCO(3) with core-shell or solid morphologies in an aqueous solution.

Highly enantioselective selenocyclization reactions are promoted by the combination of a new chiral squaramide catalyst, a mineral acid, and an achiral Lewis base. Mechanistic studies reveal that the enantioselectivity originates from the dynamic kinetic resolution of seleniranium ions through anion-binding catalysis.

In the environment, two main sources of heavy metals are natural backgrounds derived from parent rocks and anthropogenic contamination including mineral industrial wastes, tailing damps of sulfide mines, agrochemicals, and other outputs of industrial activities and factories. In this work, the physico-chemical aspects of the magnetic Nano- mineral surfaces are studied in contrast to acid mine d...