Tham khảo tài liệu 'nano- and micro eelectromechanical systems - . lyshevski part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure illustrates that the hydrogen bonding of the bases are A bonds to T G bonds to C. The complementary base sequence results. A - T G - C Figure . DNA pairing due to hydrogen bonds In RNA molecules single strands of nucleotides the complementary bases are A bonds to U uracil and G bonds to C. The complementary base bonding of DNA and RNA molecules gives one the idea of possible sticky-ended assembling through complementary pairing of NEMS structures and devices with the desired level of specificity architecture topology and organization. In structural assembling and design the key element is the ability of CP or MBB atoms or molecules to associate with each other recognize and identify other atoms or molecules by means of specific base pairing relationships . It was emphasized that in DNA A adenine bonds to T thymine and G guanine bonds to C cytosine . Using this idea one can design the CP such as A1-A2 B1-B2 C1-C2 etc. That is A1 pairs with A2 while B1 pairs with B2. This complementary pairing can be studied using electromagnetics Coulomb law and chemistry chemical bonding for example hydrogen bonds in DNA between nitrogenous bases A and T G and C . Figure shows how two nanoscale elements with sticky ends form the complementary pair. In particular is the sticky end and - is its complement. That is the complementary pair A1-A2 results. A1 A2 A1 A2 q - - q- q Q qỉ Figure . Sticky ended electrostatically complementary pair A1-A2 An example of assembling a ring is illustrated in Figure . Using the sticky ended segmented asymmetric electrostatically CP self-assembling of 2001 by CRC Press LLC monomers can be designed. However polymers made from monomers with only two linkage groups do not exhibit the desired stiffness and strength. Tetrahedral MBB structures with four linkage groups result in stiff and robust structures. Polymers are made from monomers and each monomer reacts with two other monomers to form linear chains. Synthetic and .
