Biomedical subjects

A Jagannathan

Publications and source records attributed to A Jagannathan.

8 recordsLinked to original sources

PubMed2004

Quantum spins and quasiperiodicity: a real space renormalization group approach.

We study the antiferromagnetic spin-1/2 Heisenberg model on a two-dimensional bipartite quasiperiodic structure, the octagonal tiling, the aperiodic equivalent of the square lattice for periodic systems. An approximate block spin renormalization scheme is described for this problem. The ground state energy and local staggered magnetizations for this system are calculated and compared with the results of a recent quantum Monte Carlo calculation for the tiling. It is conjectured that the ground state energy is exactly equal to that of the quantum antiferromagnet on the square lattice.

Journal Article↗

PubMed2001

Roles of rpoN, fliA, and flgR in expression of flagella in Campylobacter jejuni.

Three potential regulators of flagellar expression present in the genome sequence of Campylobacter jejuni NCTC 11168, the genes rpoN, flgR, and fliA, which encode the alternative sigma factor sigma(54), the sigma(54)-associated transcriptional activator FlgR, and the flagellar sigma factor sigma(28), respectively, were investigated for their role in global regulation of flagellar expression. The three genes were insertionally inactivated in C. jejuni strains NCTC 11168 and NCTC 11828. Electron microscopic studies of the wild-type and mutant strains showed that the rpoN and flgR mutants were nonflagellate and that the fliA mutant had truncated flagella. Immunoblotting experiments with the three mutants confirmed the roles of rpoN, flgR, and fliA in the expression of flagellin.

Amino Acid Sequence↗

PubMed1995