The highly concentrated liquid-crystalline phase of DNA is columnar hexagonal

Livolant, Françoise; Levelut, A. M.; Doucet, J.; Benoı̂t, Jean-Pierre

doi:10.1038/339724a0

Cited by 312 publications

(217 citation statements)

References 22 publications

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“…However, it would be interesting to have a theory that can handle short semi-flexible chains (say L I P around 1) with or without electrostatic interactions as well. Only then can we hope to understand the rich but complicated phase behaviour that has been observed in concentrated solutions of persistence length fragments of DNA (Rill et al 1983(Rill et al , 1991Strzelecka & Rill 1987Strzelecka et al 1988;Livolant et al 1989;Durand et al 1992). …”

Section: Discussionmentioning

confidence: 99%

Lyotropic colloidal and macromolecular liquid crystals

Lekkerkerker

Vroege

1993

Phil. Trans. R. Soc. Lond. A

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We review the theory of the isotropic—nematic phase transition for solutions of thin hard rods and semi-flexible chain molecules along with the extensions to polydisperse systems and soft interactions. The occurrence of more highly ordered liquid crystal phases (smectic, columnar) in concentrated solutions of colloids and macromolecules is discussed briefly. Experimental results for a number of carefully studied uncharged and charged colloids and macromolecules are compared to theoretical results.

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Section: Discussionmentioning

confidence: 99%

Lyotropic colloidal and macromolecular liquid crystals

Lekkerkerker

Vroege

1993

Phil. Trans. R. Soc. Lond. A

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“…They include systems of biological, organic and inorganic origin. Examples are TMV and f d viruses [3], DNA [4], β-FeOOH particles [5] and rod-shaped Carbon nanotube [6] and nanocrystals [7]. For many of these systems, however, rigid models provide only a first good approximation.…”

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confidence: 99%

Phase behavior of wormlike rods

Cinacchi¹,

Gaetani²

2008

Phys. Rev. E

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By employing Molecular Dynamics computer simulations, the phase behavior of systems of rodlike particles with varying degree of internal flexibility has been traced from the perfectly rigid rod limit till very flexible particles, and from the high density region till the isotropic phase. From the perfectly rigid rod limit and enhancing the internal flexibility, the range of the smectic A phase is squeezed out by the concomitant action of the scarcely affected crystalline phase at higher density and the nematic phase at lower density, until it disappears. These results confirm the supposition, drawn from previous theoretical, simulational and experimental studies, that the smectic A phase is destabilized by introducing and enhancing the degree of particle internal flexibility. However, no significant changes in the order of nematic-to-smectic A phase transition, which appears always first order, nor in the value of the layer spacing, are observed upon varying the degree of particle internal flexibility. Moreover, no evidence of a columnar phase, which was tought of as a possible superseder of the smectic A phase in flexible rods, has been obtained.

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“…Пpи таком cпоcобе упаковки в фазе можно выделить «cлои» из cоcедниx молекул ДНК (показаны cтpелками)  Таким образом, при критической концентрации ДНК в водно-солевых растворах (при комнатной температуре) возникает конденсированная фаза ДНК [15,16]. Известно также, что для фазы, образованной при высокой концентрации линейных дц молекул ДНК в водно-солевых растворах характерна высокая плотность упаковки соседних молекул [11,[17][18][19]. Такая упаковка в принципе может быть гексагональной.…”

Section: Introductionunclassified