Construction of molecular logic gates with a DNA-cleaving deoxyribozyme

Chemical Approaches to Molecular Logic Elements for Addition and Subtraction

Molecular and supramolecular logic gates are candidates for computation at the nanoscale level. Nowadays all common logic operations can be mimicked with molecular devices based on chemical approaches. One step further towards molecular systems with increased logic capabilities is the addition or subtraction of binary digits. This Minireview describes recent developments to attain this goal, including bioinspired systems based on DNA and enzymes. Furthermore, chemical molecular logic gates are discussed and compared critically with regard to alternative concepts.

Unmodified gold nanoparticles as a colorimetric probe for potassium DNA aptamers

Unmodified gold nanoparticles effectively differentiate unfolded and folded DNA, thus providing a novel approach to colorimetrically probe aptamer-based recognition processes.

Synthetic Studies on Et-743. Asymmetric, Stereocontrolled Construction of the Tetrahydroisoquinoline Core via Radical Cyclization on a Glyoxalimine

[Structure: see text] The asymmetric synthesis of a highly functionalized tetrahydroisoquinoline relevant to the total synthesis of Et-743 is described. The key step involves a highly diastereoselective radical cyclization on a glyoxalimine derivative.