A novel fluorescein-porphyrinatozinc(II) hybrid, Zn(Fl-PPTPP), was synthesized and characterized by u.v.-vis., i.r., 1 H-n.m.r, ESMS and elemental analyses. The supramolecular self-assembly of Zn(Fl-PPTPP) with an imidazolyl-linked porphyrinatomanganese(III), Mn (III) ( p-ImBPTPP)Cl, complex has been studied by fluorescence spectroscopic titration, VPO measurements and ESMS, which indicates that the formation of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl. supramolecular complex is driven by coordinative bonding formed by the coordination of imidazolyl group in Mn (III) ( p-ImBPTPP)Cl to Zn(II) in Zn(Fl-PPTPP). The association constant of the supramolecular complex was calculated from the fluorescence spectroscopic titration data. It was found that the conformation of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl supramolecular complex, the steric hindrance and the electronic effect of the fluorescein group linked to porphyrin through a flexible long alkoxy chain are all acting on the association constant of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl supramolecular complex. It seems that the steric hindrance and the electronic effect of the fluorescein group are the primary factors effecting the association constant of Zn(Fl-PPTPP)-Mn (III)
Gridding dimension has been carried out in order to measure and illustrate the complexity and self-similarity of coding sequences from human genes. The fractal dimensions of DNA sequences, including exons, coding sequences and some random ones have been studied in this work. The 60 genes from human genome were the choice as samples, and the results show that the gridding dimension of the whole coding sequences is smaller than that of every exon. The conclusion was corroborated by random sequences, and by combination of fractal theory with Fourier power spectrum, it speculated that gene with fewer exons could embody more information while it was contrary for gene with more exons and some information might be stored in introns generally. These results are helpful to understand the complexity of DNA sequences.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.