A Single Scale Theory for Cold and Hot Dark Matter

We show that a recently proposed extension of the MSSM can provide a scenario where both the cold and hot dark matter of the universe owe their origin to a single scale connected with the breakdown of the global B-L symmetry. The susy partner of the majoron and the light Majorana neutrinos are the cold and hot dark matter candidates respectively in this model and their desired relative abundances emerge when the scale of B-L symmetry breaking is in the TeV range.Comment: UMD-PP-94-102 (latex file; 15 pages

Molecular computing by PNA:PNA duplex formation

Molecular computing is potentially one of the most powerful tools for the development of massive parallel computing protocols. In the present paper, a first example of the use of PNA:PNA interactions in molecular computing is described. A series of short PNA sequences have been designed with a four base stretch coding for variables and solutions. Hybridization of the components in different combinations was tested both in solution and in a microarray format. A series of PNA representing the solutions were spotted on a microarray surface in order to simulate the hardware. A series of PNA representing the variables, labeled with TAMRA, were used to interrogate the device enabling to solve non-deterministic logic operations. The system was shown to be able to solve a two-variable equation with a high signal to noise ratio. This paper intends to provide a proof of principle that PNA, on account of their stability and specificity of binding, are most suitable for constructing organic-type computers