The Investigation of the Various Structures of DNA Molecules(Ⅲ) The Coil toroid Transition of λ-DNA Induced by the Biomolecular Probe AO

Abstract

Abstract: The helix and structure transition of λ-DNAin AOsolutions were investigated by SEMand AFMmethods. Using SEM, we observed the turn and globular as well as toroidal condensates of λ-DNAinduced by AO. The fine structures of these condensates were further observed by using AFM. Our results reveal that the mechanism of the coil-toroid transition of λ-DNAresulted from the changed environment is related to the shrinking and collapsing process as well as the self-assembling process of these condensates.

Key words: λ-DNA, AO, Sanning electron microscopy, Atomic force microscopy

CLC Number:

Q228

TrendMD:

FENG Xi-Zeng, LIN Zhang, MA Jin, WANG Chen, BAI Chun-Li . The Investigation of the Various Structures of DNA Molecules(Ⅲ) The Coil toroid Transition of λ-DNA Induced by the Biomolecular Probe AO[J]. Chem. J. Chinese Universities, 1998, 19(9): 1498.

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