Modified Laboratory Vacuum Evaporator for Bacterial Quantitation

New turbidimetric assay for quantitation of viable bacterial densities.

A turbidimetric assay was developed and validated against Escherichia coli for the quantitation of viable bacterial densities. The Abbott MS-2 research system was employed for continuous 5-min measurements of optical density. A linear standard curve was obtained by regressing the initial bacterial density (log CFU per milliliter) against the time required for bacterial growth causing a 5% decre...

Vacuum packing: a model system for laboratory-scale silage fermentations.

AIMS To determine the utility of vacuum-packed polythene bags as a convenient, flexible and cost-effective alternative to fixed volume glass vessels for lab-scale silage studies. METHODS AND RESULTS Using perennial ryegrass or red clover forage, similar fermentations (as assessed by pH measurement) occurred in glass tube and vacuum-packed silos over a 35-day period. As vacuum-packing devices ...

Laboratory Diagnosis of Nosocomial Bacterial Infections Using Standard Methods

Background and objective: Implementation of standard methods for accurate detection of bacteria, correct antibiotic susceptibility testing and effective treatment of bacterial infections play important roles in development of public health and prevention of drug resistance. This study aimed to detect bacteria using standard methods and compare the results with the results obtained in teaching h...

The modified dynamics as a vacuum effect

To explain the appearance in MOND of a cosmological acceleration constant, a0, I suggest that MOND inertia–as embodied in the actions of free particles and fields–is due to effects of the vacuum. The same vacuum effects enter both MOND (through a0) and cosmology (e.g. through a cosmological constant Λ). For example, a constant-acceleration (a) observer in de Sitter universe sees Unruh radiation...

APV Evaporator Hndbook