Antibacterial and anti-biofilm activity of the lipid extract from <Emphasis Type="Italic">Mantidis ootheca</Emphasis> on <Emphasis Type="Italic">Pseudomonas aeruginosa</Emphasis>

The aim of this study is to assess the antibacterial and anti-biofilm properties of the lipid extract from Mantidis ootheca against the gentamycin resistant Pseudomonas aeruginosa. The chemical composition of the lipid extract and its relative proportion were determined using the technique of gas chromatography coupled with mass spectrometry (GC-MS). Antibacterial susceptibility tests were performed using a disc diffusion assay and the minimum inhibition concentration (MIC) was determined by way of the agar dilution method. The anti-biofilm test was carried out with crystal violet staining and scanning electron microscopy (SEM). There were 16 compounds detected, and the most abundant components were sesquiterpenoids, monoterpenes, and trace aromatic compounds. The MIC for P. aeruginosa was 4 mg/ml and the eradication effect on preformed biofilms was established and compared with a ciprofloxacin control. The results of our study indicated that a lipid extract from M. ootheca could be used as a topical and antibacterial agent with anti-biofilm activity in the future.     

Concentration and temperature dependence of viscosity of uranium solutions in H<Subscript>2</Subscript>O and 3 mol/L HNO<Subscript>3</Subscript>

Viscosities of uranium solutions in H2O and 3 mol/L HNO3 medium were measured by Ubbelhode flow viscometer in the concentration range of 0.5%-3.0% from 10 oC to 30 ℃ at 5 ℃ interval. Viscosity data were interpreted in terms of an empirical equation; η =aoexp(boM coM2). Values of coefficients ao, bo and co were calculated for all the three systems studied. Flow activation energies and thermodynamic parameters were also evaluated.