HMR 3004 is a new hydrazono ketolide characterized by a 3-keto function instead of the cladinose moiety. The effect of this antimicrobial agent on inducible and constitutive macrolide-lincosamide-streptogramin B (MLSB) resistance was tested in a lacZ reporter system under control of several ermAM-like attenuator variants. For one constitutively resistant Streptococcus agalactiae strain, three i...

T cell activation is regulated by coordinate interaction of the T cell Ag receptor and costimulatory signals. Although there is considerable insight into processes that regulate the initiation of inflammation, less is known about the signals that terminate immune responses. We have examined the role of the inhibitory receptors programmed death receptor-1 and B and T lymphocyte attenuator in the...

Ribosomal protein L4 of Escherichia coli autogenously regulates both transcription and translation of the 11-gene S10 operon. Transcription regulation occurs by L4-stimulated premature termination at an attenuator hairpin in the S10 leader. This effect can be reproduced in vitro but depends on the addition of transcription factor NusA. We show that NusA is required to promote RNA polymerase pau...

Sequence deletions of 16, 59, and 111 bp as well as a tandem duplication of 272 bp with respect to the corresponding sequence of pT48 were identified in the regulatory regions of constitutively expressed ermC genes. Constitutive ermC gene expression as a consequence of these structural alterations is based on either the prevention of the formation of mRNA secondary structures in the translation...

We have recently reported that transcription factor 8 (TCF8) negatively regulates pathological angiogenesis by regulating endothelial invasiveness by acting as a transcriptional attenuator of matrix metalloproteinase 1. TCF8 also modulates cell-matrix and cell-cell adhesion; however molecular mechanism of this TCF8 function remains obscure. Here, we provide evidence that TCF8 activates R-Ras, a...

Ribosomes contain a number of modifications in rRNA, the function of which is unclear. Here we show--using proteomic analysis and dual fluorescence reporter in vivo assays--that m(2)G966 and m(5)C967 in 16S rRNA of Escherichia coli ribosomes are necessary for correct attenuation of tryptophan (trp) operon. Expression of trp operon is upregulated in the strain where RsmD and RsmB methyltransfera...

This study compared pure-tone threshold data, acoustic reflex threshold data, and loudness growth data for a group of 25 hyperacusic male subjects vs. a group of 13 nonhyperacusic male subjects. Pure-tone thresholds and acoustic reflex thresholds were obtained in 5-dB steps, using revised HughsonWestlake procedures. Loudness growth functions were obtained with a fractionation (method of adjustm...

This paper proposes vector modulator for changing the phase of a signal in passive beamforming system. Vector modulator is used to perform a phase shift function with added benefit of amplitude control. It is used to improve the directivity of RF waves in Wireless systems. Vector modulator is implemented for a center frequency of 902.5 MHz. The simulation is performed for individual blocks of t...