BACKGROUND Analyses of substrate and metabolites are often bottleneck activities in high-throughput screening of microbial bioprocesses. We have assessed Fourier transform infrared spectroscopy (FTIR), in combination with high throughput micro-bioreactors and multivariate statistical analyses, for analysis of metabolites in high-throughput screening of microbial bioprocesses. In our previous st...

An acidophilic metal-resistant bacterial strain, Acidomyces acidothermus (A. acidothermus), was isolated and identified by morphology, physiology, biochemistry, 16S rDNA. A. culture conditions were optimized response surface methodology (RSM). Results showed that with a temperature of 40 °C, pH 3 in 9k medium, rotation speed 140 r/min, the copper leaching rate reached highest value 39.8%. Furth...

We have developed a method for rapid quenching of samples taken from chemostat cultures of Escherichia coli that gives reproducible and reliable measurements of extracellular and intracellular metabolites by 1H NMR and have applied it to study the major central metabolites during the transition from anaerobic to aerobic growth. Almost all metabolites showed a gradual change after perturbation w...

The effects of anxiolytic doses of buspirone and midazolam (established in the conditioned fear test) on extracellular concentrations of glutamate, GABA, serotonin and dopamine metabolites in the hippocampus were examined in vivo, in freely moving rats. Buspirone at a dose of 1.5 mg/kg ip disinhibited rat behavior in the conditioned fear test (a freezing response) much stronger than 1.0 mg/kg o...

Increased production of oxidative metabolites following interaction between mononuclear phagocytes and soluble stimuli can be measured as luminol-amplified chemiluminescence (CL). The effects of superoxide dismutase (SOD), catalase, and azide on the monocyte CL response were investigated. Azide, a myeloperoxidase (MPO) inhibitor, reduced the CL reaction by more than 80%, which indicates that th...

Tyrosine administration elevates striatal levels of dopamine metabolites in animals given treatments that accelerate nigrostriatal firing, but not in untreated rats. We examined the possibility that the amino acid might actually enhance dopamine release in untreated animals, but that the technique of measuring striatal dopamine metabolism was too insensitive to demonstrate such an effect. Dopam...

The opportunistic pathogen Pseudomonas aeruginosa produces colorful redox-active metabolites called phenazines, which underpin biofilm development, virulence, and clinical outcomes. Although phenazines exist in many forms, the best studied is pyocyanin. Here, we describe pyocyanin demethylase (PodA), a hitherto uncharacterized protein that oxidizes the pyocyanin methyl group to formaldehyde and...

Melanoma is the most aggressive skin cancer and responsible for majority of deaths. Despite advances in treatment, our current prognostic indicators are poor fail to adequately risk-stratify patients. This study evaluates concentration, size, proteomic metabolomic profile circulating extracellular vesicles (EVs) isolated from plasma patients with melanoma, identify potential biomarkers disease ...

Background Metabolic studies are of fundamental importance in metabolic engineering approaches to understand cell physiology and to pinpoint metabolic targets for process optimization. Knowledge on intracellular metabolites, in particular in combination with powerful dynamic metabolic flux analysis methods will substantially expand our basic understanding on metabolism, e.g. about metabolic com...