We present an abundance analysis of light elements in He-rich stars. The analysis is based on both low and high resolution observations collected at ESO, La Silla, Chile in the optical region and includes 6 standards and 21 He-rich stars. Light-element abundances display a diverse pattern: they range from under-solar up to above-solar values.

In vivo mutational analysis of the yeast RPS28A ribosomal protein (rp-)gene promoter demonstrated that both the Abf1p binding site and the adjacent T-rich element are essential for efficient transcription. In vivo Mnase and DNaseI digestion showed that the RPS28A promoter contains a 50-60 bp long nucleosome-free region directly downstream from the Abf1p binding site, followed by an ordered arra...

The Mycobacterium tuberculosis TrcR response regulator binds and regulates its own promoter via an AT-rich sequence. Sequences within this AT-rich region determined to be important for TrcR binding were used to search the M. tuberculosis H37Rv genome to identify additional related TrcR binding sites. A similar AT-rich sequence was identified within the intergenic region located upstream of the ...

The hemopoietic-specific Gads (Grb2-related adaptor downstream of Shc) adaptor protein possesses amino- and carboxyl-terminal Src homology 3 (SH3) domains flanking a central SH2 domain and a unique region rich in glutamine and proline residues. Gads functions to couple the activated TCR to distal signaling events through its interactions with the leukocyte-specific signaling proteins SLP-76 (SH...

A restriction fragment has been isolated and its nucleotide sequence determined. This fragment contains sites for RNA polymerase binding, initiation and termination of transcription of the Escherichia coli histidine operon. In vitro transcription of plasmids containing this region generates one single histidine-specific, attenuated, small RNA: the leader RNA. This RNA is more efficiently transc...