Search

In this study, magnetic metal organic framework composites as capture probe and immunofunctionalized gold nanoparticles as signal probe were used to develop a rapid colorimetric method for the detection of Listeria monocytogenes. Under optimal conditions, the visual detection limit for L. monocytogenes was 1.2 × 103 CFU/mL. The results of ultraviolet spectroscopy showed a good linear relationship in the range of 1.2 × 101‒1.2 × 108 CFU/mL (Y = 0.519 ‒ 0.043X, R2 = 0.978), the detection limit was as low as 0.45 CFU/mL, and the intra-batch coefficient of variation of all concentration gradients was between 0.31% and 1.30%. The recoveries for spiked chicken breast were 91.1%‒108.7% with coefficient of variation less than 7.4%, and the result was consistent with that of the plate counting method. In conclusion, the proposed assay is rapid, accurate sensitive, and highly applicable to the detection of foodborne pathogens.

The optimization effect of evaporative cooling ventilation cooling system for air compressor room in textile mills were studied. For on-site test of the air compressor room in one textile mill, the standard k-e model in RANS method of numerical simulation was used to simulate the air distribution of air compressor room.Reginal cooling optimization design was performed for the air compressor device. And the effect was compared. The test results showed that the average temperature around 1 m front and back of the device was decreased obviously.The unevenness coefficient of the temperature was decreased from 0.157 6 to 0.112 0. It is considered that the optimization scheme can obviously reduce the surface temperature of the air compressor. The indoor temperature evenness is improved too.It has better cooling effect. [ABSTRACT FROM AUTHOR]