| 摘要 |
<p>A block (1, 2) includes a first pivotal connection means (5) provided on one side of the block (1, 2), two fifths of the length of the block from one end, and a second pivotal connection means (10) provided on the opposite side of the block (1, 2) two fifths of the length of the block from the other end. The first pivotal connection means (5) is arranged to be connected to the second pivotal connection means (10) of a like underlying or overlying block (1, 2), so that a plurality of said blocks can be connected to form a double helix. Each end of the block (1, 2) includes a linkig means (3, 4) for connecting a plurality of blocks to a flexible member (15, 16) which follows a double helix shape to produce a model for DNA.</p> |
