The origin of the RNA world: a kinetic model

Article Abstract:

Microscopic kinetic models were developed and studied for the evolution of long chains of RNA from monomeric beta-D-ribonucleotide precursors in prebiotic situations. The models include the possibility of direct chain growth, template-assisted synthesis and catalysis by RNA replicase ribozymes. However, the reaction mechanisms are kept open and the presence of closed hypercycles, which sustain a population of long chains, is not assumed.

Research, RNA, Chemical reaction, Rate of, Chemical kinetics

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Enhancement of two-photon absorption cross-section in macrocyclic thiophenes with cavities in the nanometer regime

Article Abstract:

The linear and nonlinear optical properties of two thiophene-based cyclic molecules are examined. Measurements of the different size ring structures revealed a 550% increase in the two-photon absorption (TPA) cross-section for the larger macrocycle, while the electronic structure calculations suggest an increase in coupling of the excited states in these systems as the ring size is increased.

Electric properties, Photons, Optical properties, Structure, Thiophene

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