Expression of the tryptophanase (tna) operon of Escherichia coli is regulated by catabolite repression and by tryptophan-induced transcription antitermination. Tryptophan induction prevents Rho-dependent transcription termination in the leader region of the operon. Induction requires translation of a 24-residue leader peptide-coding region, tnaC, containing a single, crucial Trp codon. Studies ...

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Different brain circuits mediate the acquisition of skills and habits (via operant/instrumental learning) and the acquisition of facts (via classical/Pavlovian learning). Realistic learning situations always comprise interactions of skill-and fact-learning components (composite learning). So far, these interactions have escaped thorough scrutiny. Fixed flying Drosophila melanogaster at the torq...

BACKGROUND Coronary artery diseases (CAD) are associated with psychological problems such as anxiety and depression in patients. Thus, management of these problems can consider as an important intervention by health care workers, especially nurses. OBJECTIVES The purpose of this study was to investigate the effectiveness of patient-focused clinical pathway on anxiety, depression and satisfact...

Despite advances in the treatment of head and neck squamous cell carcinoma (HNSCC), morbidity remains at a high level due to resistance SCC cells chemotherapeutics. This study aimed determine compare magnitude flavonoids’ effectiveness activating apoptosis migration arrest HNSCC vitro. Methods: Head Detroit 562 line were exposed range concentrations (5–100 μM) quercetin (Que), hesperidin (Hes) ...

abstract: introduction & objective: helicobacter pylori are among the important pathogens responsible for chronic gastritis, peptic ulcer and gastric cancer. the present study aimed to comparatively evaluate pcr and rut methods for detection of h. pylori and determination of the prevalence of the cagapositive helicobacter pylori strains in shahrekord. materials & methods: this is a molecular ep...

background and objectives: invasive and non-invasive techniques are used to diagnose h. pylori infection. some factors influence the choice of a diagnostic test, such as the sensitivity and specificity of the tests, the clinical circumstances and the cost-effectiveness of the testing strategy. the aim of this study was to reveal the relationship between different h. pylori infection diagnosis m...

soil compaction can occur as a result of a number of factors. one of the most important factors is soil response to pressures imposed by wheels and soil engaging tools. this research investigated the effect of tyre load and inflation pressure on soil compaction-related factors. these factors include rut width, rut depth, cone index and horizontal force in different layers of soil profile. in th...

We show the existence, size and some absorbing properties of global attractors of the nonlinear wave equations with nonlinear dissipations like ρ(x, ut) = a(x)|ut|rut.

Background The filamentous fungus Trichoderma reesei Rut-C30 is one of the most vital fungi for the production of cellulases, which can be used for biofuel production from lignocellulose. Nevertheless, the mechanism of transmission of external stimuli and signals in modulating cellulase production in T. reesei Rut-C30 remains unclear. Calcium is a known second messenger regulating cellulase gen...