IN their discussion of mutation in stationary populaTheir data, and that of Rosche and Foster (1999), show that any given class of mutation is z10 times less tions of Escherichia coli, Bull et al. (2000) conclude that all the mutations are arising in a small fraction of common in single (Lac) mutants than in double mutants (Lac plus a second mutation). For example, Torthe population. They give ...

TO THE EDITOR: With great interest we have been following the discussion about our study published in Journal of Neurogastroenterology and Motility. 1 We highly estimate the recent constructive comments expressed by the authors Erdogan and colleagues 2 and would like to make some conclusive remarks. We fully agree with the authors that all patients with irritable bowel syndrome (IBS)-like sympt...

Saccharomyces cerevisiae maintains a large family of hexose transporters encoded by the HXT genes. The major transporter genes, HXT1 through HXT7, were sequenced from four vineyard isolates and two commercial wine yeast strains and compared to the sequences in the Saccharomyces Genome Database for strain S288C and to those available for two additional wine strains V5 and RM11-1a. Base pair chan...

A general acid-base catalytic mechanism for ribonuclease A and other ribonucleases was previously widely accepted. However, an alternative to this mechanism was recently reintroduced in which attack by the 2’ hydroxyl group is facilitated by protonation of a nonbridging phosphoryl oxygen atom, instead of the leaving group oxygen atom, to give a triester-like mechanism of catalysis. Literature v...