We have previously reported that metal ion binding could restrict the excited state rotation of a biaryl chromophore, suppressing intersystem crossing and leading to increased emission. We have now applied the restriction of excited state dynamics to suppression of the other fundamental nonradiative decay pathway, internal conversion, in biarylacetylenes. This indicates that both nonradiative d...

The structure and activity of nucleic acids depend on their interactions with metal ions. Fundamental to these interactions is the degree of specificity observed between the metal ions and nucleic acids, and a complete description of nucleic acid folding requires that we understand the nature of the interactions with metal ions, including specificity. The prior demonstration that high concentra...

Absrract: We have been concerned with the development of alternate strategies for achievinc; metalion recognition. An important aspect of this research has been to investigate meta! ion complexation over a range of related macrocycles, incorporating different macrocyclic rhg sizes, donor atom set combinations and/or degree of ring substitution and to search for stability rrnxima at different po...

The molecular weight of goat carboxypeptidase A was found to be approximately 34,600 by Gel-filtration and SDSmethod. It was found to be a zinc-metalloprotein both by chemical and emission spectroscopy methods, having one atom of zinc per protein molecule. Removal of zinc either by cJis...1.ysis at pH 6.0 or below and by the use of thelating agents at neutral pH, yislded an inactive apocarlooxy...

Concerns have been renewed regarding the possible long-term effects of elevated circulating levels of cobalt and chromium as a direct result of implantation of large femoral head diameter metal-on-metal bearings. In order to establish whether metal ion levels remain persistently elevated, we compared metal ion levels before and after revision surgery in patients with large head diameter (greate...

The roles of organic matter in seawater have often been discussed from the aspect of metal toxicity and bioavailability in seawater. In fact, organic ligands, as part of the organic matter, can work as a trace metal ion buffer system. At the same time, however, the release of well-defined metal chelators as exudates by, for example, marine bacteria is necessary to compete with natural metal com...

' 'N the accompanying letter by Germer and Haworth, ~ evidence is presented to show that a positive ion in a high field (~107 volts/cm) must be able to eject several electrons from a metal. On the other hand, present theories of ejection by positive ions in low fields require that the ion be neutralized as the first step in the ejection process and, hence, that an ion be unable to eject more th...

a simple ion imprinted amino-functionalized sorbent was synthesized by coupling activated carbon with iminodiacetic acid, a functional compound for metal chelating, through cyanoric chloride spacer. the resulting sorbent has been characterized using fourier transform infrared spectroscopy (ft-ir), elemental analysis, thermogravimetric analysis (tga) and evaluated for the preconcentration and de...