The tetra azophenylcalix[4]arene with ortho-ester group was applied for determination of transition metal ions using spectrophotometer. In this case, the derivatives with ortho-ester group turned out the complexing formation selectively with transition metal ions over alkali, alkaline earth metal ions. From those, this study used the molecular mechanic method MM+ and molecular dynamic simulatio...

A sequential separation scheme has been devised for the quantitative analytical separation of 27 different metal ions. Five different Chromatographic and ion-exchange columns are used to separate the metal ions into groups. The metal ions of each group are eluted separately from each column by means of selective eluents. Following separation, the metal ions are determined by titrimetry, flame s...

Fragmentation behavior of two classes of cyclodepsipeptides, isariins and isaridins, obtained from the fungus Isaria, was investigated in the presence of different metal ions using multistage tandem mass spectrometry (MS(n)) with collision induced dissociation (CID) and validated by NMR spectroscopy. During MS(n) process, both protonated and metal-cationized isariins generated product ions belo...

The ocean contains a number of metal ions that are either bene fi cial or detrimental to marine lives or ecology. Developing sensors for on-site and real-time detection of these metal ions plays an important role in our understanding the ocean as well as its protection. DNAzymes, DNA molecules with enzymatic functions, have emerged as a new class of sensing molecules for metal ions, because DNA...

The biosorption of heavy metals can be an effective process for the removal of such metal ions from aqueous solutions. In this study, the adsorption properties of nonliving biomass of phanerochaete chrysosporium for Pb (II) and Zn (II) were investigated by the use of batch adsorption techniques. The effects of initial metal ion concentration, initial pH, biosorbent concentration, stirring speed...

Metal ions play an important role in various biological processes, their abnormal homeostasis in cells is related to many diseases, such as neurodegenerative disease, cancer and diabetes. Fluorescent imaging offers a unique route to detect metal ions in cells via a contactless and damage-free way with high spatial and temporal fidelity. Consequently, it represents a promising method to advance ...

BACKGROUND The catalytic activity of RNA enzymes is thought to require divalent metal ions, which are believed to facilitate RNA folding and to play a direct chemical role in the reaction. RESULTS We have found that the hammerhead, hairpin and VS ribozymes do not require divalent metal ions, their mimics such as [Co(NH3)6]3+, or even monovalent metal ions for efficient self-cleavage. The HDV ...

Various kinds of roles of the water molecules in the electronic states of the complexes of metal ions (M ) and deoxyribonucleic acid (DNA) are reviewed. Divalent metal ions M like Fe, Mn, Zn and so on, form Metal-DNA complexes (M -DNA) with each metal ion between the bases of a base pair of DNA. The electronic states of the complexes depend on the species of ions in M -DNA. Metal ions in Fe-DNA...

A comparative research has been developed for acidity and stability constants of M(Glu), M(Asp) and M(Ttr) complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) complexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(As...

Natural cyclic tetrapyrroles feature outstanding capacity for binding transition metal ions, furnishing Nature with the important metallo-porphyrinoid 'Pigments of Life', such as heme, chlorophyll (Chl) and vitamin B12. In contrast, linear tetrapyrroles are not generally ascribed a biologically relevant ability for metal-binding. Indeed, when heme or Chl are degraded to natural linear tetrapyrr...