S. Ikeda and A. Okamoto have designed a doubly fluorescence-labeled nucleoside and observe an absorption band at approximately 480 nm when the probe is in a single-stranded state, whereas an absorption band at approximately 510 nm becomes predominant when the probe is hybridized with the complementary strand. This clear change in fluorescence intensity that is dependent on hybridization is useful for visible gene analysis. For more information, see their Full Paper "Hybridization-Sensitive On-Off DNA Probe: Application of the Exciton Coupling Effect to Effective
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Rings Show Cation-Modulated Magnetism. -The new compounds (III) crystallize in the triclinic space group P1 with Z = 1 (IIIa) and Z = 2 (IIIb). Both compounds possess condensed Cu-azido layers made of [Cu6(N3 ]n anionic chains, separated by the diammonium cations. The molecular geometry results in ferromagnetic interactions within the Cu-azide layer in both compounds. (IIIa) displays long-range antiferromagnetic ordering at low temperatures and short-range ferromagnetic interaction at high temperatures, while only short-range ferromagnetism exists in compound (IIIb) at 2
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