double helix

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Related to Double helices: Double helix structure
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a pair of parallel helices intertwined about a common axis

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This paper presents three-dimensional artificial triple helices where both RCP and LCP waves propagate inside the triple helix stack with low loss, unlike single and double helices, where one of the two circularly polarized waves is normally filtered out.
Based on its right-handed orientation, the RCP wave can propagate through both single and double helices, while the LCP wave is almost blocked [7-10,19] at the resonance frequency, at 4.
Wongkasem, "Three-dimensional artificial double helices with high negative refractive index," J.
Chains of these linked pyridine twins spontaneously braid into double helices around copper ions.
The new synthetic structures offer a means for studying how natural and lab-made double helices form and bind to other molecules, such as DNA.