tailieunhanh - Nanotechnology Science and Computation part 2

Tham khảo tài liệu 'nanotechnology science and computation part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Scaffolded DNA Origami 17 in a spiral pattern spiraling out from 5 to 3 from the center along the red contour and spiraling back in along the black contour. More tree-like folding paths similar to that of Fig. 8c are obviously possible but it is my intuition that a spiral folding path will leave the smallest possibility of The dodecahedron uses only 12 DNA 3-stars - using the standard 7000-base scaffold would thus allow the use of larger DNA 3-stars with longer arm lengths and requiring more than two helper strands per arm . Using DNA 3-stars the edge lengths would be 11 turns 116 bases and the total scaffold would be 6960 bases long. Each edge would be nm and the diameter of a sphere enclosing the dodecahedron would be 110 nm. Ned has described his work on geometrical DNA constructs as pure Buckminster Fuller . Scaffolded origami may now allow the simple construction of a DNA buckyball Fig 10c d show the Schlegel diagram and molecular design a DNA analog of the carbon allotrope fullerene or C6Q. Using DNA 3-stars such an analog would require only a 5760-base scaffold and would thus be a little smaller and less complex than current scaffolded designs. Carbon buckyballs are nm in diameter - a DNA buckyball would be 50 nm in diameter and have over 300 000 times the volume. Probably too floppy to image well with atomic force microscopy DNA buckyballs and dodecahedra would have to be characterized by an electron microscopy technique such as single-particle analysis or electron tomography. While I have so far presented structures created from DNA 3-stars it is possible that scaffolded polygonal origami can be created from other k-stars Fig. 11 . DNA 4-stars seem likely to be well-behaved because the 4 X 4 molecules are so well-behaved. DNA 5-stars tolerant of the appropriate angles would make scaffolded icosahedra possible DNA 5-stars would yield icosohedra with a 75 nm enclosing sphere and a 6960-base scaffold . .