Bacterial standard

Bacterial standard (standard turbidity) - the standard for determining the concentration of bacterial (alive or dead) cells in suspension by the degree of turbidity. For bacteria of various sizes are appropriate B. C. international standard turbidity consists of suspended particles neutral glass, close in size to the size of bacteria. Turbidity it corresponds turbidity pertussis bacteria in concentrations of 10 billion microbial cells in 1 ml to produce standardization bacterial suspensions, it pour in the literature accompanying the turbidity standard of the tube, the size is identical to the standard. The original suspension bred saline solution up until the turbidity will not be equal to the turbidity standard that defines a special font, also attached to the turbidity standard. Cm. also Bacterial drugs.

Bacterial standard - the standard turbidity to determine the concentration of bacterial cells in suspension. Bacterial standard is a suspension in the physiological solution of typhoid bacteria, dead 2% formalin solution or by heating at temperature 60 degrees for 1,5 hour. with the addition of 0.5% phenol. Bacterial standards are few stable during storage; in this regard, their production is halted. Currently widespread standards turbidity, made of glass Pyrex: suspended glass in distilled water with addition of thimerosal (1 : 10 000).
In the turbidity standard of General type particle size 0.5-3.5 microns; the standard used to determine the concentration of pertussis bacteria, particle size is 0,5-1,5 MK. Glass turbidity standard of General type consists of four standards: standard 5 (5 per turbidity, or 0.5 billion bacteria in 1 ml)standard 9 (9 units turbidity, or 0.9 billion bacteria in 1 ml), the benchmark 10 (10 units turbidity, or 1 billion bacteria in 1 ml ) and standard 11 (11 units of turbidity, or 1.1 billion bacteria in 1 ml). The standard to determine the concentration of pertussis bacteria consists of three standards - on 9, 10 and 11 units of turbidity (respectively 9, 10 and 11 billion bacteria in 1 ml); international standard equal to 10% turbidity (10 billion pertussis microbes in 1 ml). 1 unit turbidity standard General purpose of State control in-TA im. Tarasevich equal to 1.16% turbidity international standard and 0.25% turbidity standard brown & Wellcome.
To produce standardization bacterial suspensions, it pour in the literature accompanying the turbidity standard of the tube, the size is identical to the standard. The original suspension bred saline solution up until the turbidity will not be equal to the turbidity standard that defines a special font, also attached to the turbidity standard.