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Researchers at University of California Release New Data on DNA Research (Chiral Electronic Transitions in Fluorescent Silver Clusters Stabilized by...

August 26, 2014



Researchers at University of California Release New Data on DNA Research (Chiral Electronic Transitions in Fluorescent Silver Clusters Stabilized by DNA)

By a News Reporter-Staff News Editor at Life Science Weekly -- Fresh data on DNA Research are presented in a new report. According to news reporting originating from Santa Barbara, California, by NewsRx correspondents, research stated, "Fluorescent, DNA-stabilized silver clusters are receiving much attention for sequence-selected colors and high quantum yields. However, limited knowledge of duster structure is constraining further development of these 'Ag-N-DNA' nanomaterials."

Our news editors obtained a quote from the research from the University of California, "We report the structurally sensitive, chiroptical activity of four pure Ag-N-DNA with wide ranging colors. Ubiquitous features in circular dichroism (CD) spectra include a positive dichroic peak overlying the lowest energy absorbance peak and highly anisotropic, negative dichroic peaks at energies well below DNA transitions. Quantum chemical calculations for bare chains of silver atoms with nonplanar curvature also exhibit these striking features, Indicating electron flow along a chiral, filamentary metallic path as the origin for low-energy AgN-DNA transitions. Relative to the bare DNA, marked UV changes in CD spectra of AgN-DNA and silver cation DNA solutions indicate that ionic silver content constrains nucleobase conformation."

According to the news editors, the research concluded: "Changes in solvent composition alone can reorganize cluster structure, reconfiguring chiroptical properties and fluorescence."

For more information on this research see: Chiral Electronic Transitions in Fluorescent Silver Clusters Stabilized by DNA. ACS Nano, 2014;8(7):6883-6892. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Nano - www.pubs.acs.org/journal/ancac3)

The news editors report that additional information may be obtained by contacting S.M. Swasey, University of California, Dept. of Phys, Santa Barbara, CA 93106, United States. Additional authors for this research include N. Karimova, C.M. Aikens, D.E. Schultz, A.J. Simon and E.G. Gwinn (see also DNA Research).

Keywords for this news article include: California, DNA Research, Santa Barbara, United States, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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