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Determining the viable cell count is important for calculating dilutions required for the passaging of cells, as well as determining the size and number of flasks needed during growth time. It is also vital when seeding plates for assays, such as the plaque assay , [ 2 ] because the plates need a known number of live replicating cells for the ...
The Miles and Misra Method (or surface viable count) is a technique used in Microbiology to determine the number of colony forming units in a bacterial suspension or homogenate. The technique was first described in 1938 by Miles, Misra and Irwin who at the time were working at the LSHTM. [1] The Miles and Misra method has been shown to be ...
Additionally, plating is the slowest method of all: most microorganisms need at least 12 hours to form visible colonies. Although this method can be time-consuming, it gives an accurate estimate of the number of viable cells (because only they will be able to grow and form visible colonies).
The Most Probable Number method counts viable cells and is useful when enumerating low concentrations of cells or enumerating microbes in products where particulates make plate counting impractical. [30] Modified Fishman Units take into account bacteria which are viable, but non-culturable.
The count represents the number of colony forming units (cfu) per g (or per ml) of the sample. A TVC is achieved by plating serial tenfold dilutions of the sample until between 30 and 300 colonies can be counted on a single plate. The reported count is the number of colonies counted multiplied by the dilution used for the counted plate
This plated viability assay measures various yeast viability though a method called "frogging". The research is completed through drop-inoculation techniques. Research has since been conducted on "tadpoling", which is a variation of "frogging" that is completed by keeping the test cells diluted in liquid throughout their examination. [1]
The table shown on the right can be used in a two-sample t-test to estimate the sample sizes of an experimental group and a control group that are of equal size, that is, the total number of individuals in the trial is twice that of the number given, and the desired significance level is 0.05. [4]
Virtual colony count (VCC) is a kinetic, 96-well microbiological assay originally developed to measure the activity of defensins. [1] It has since been applied to other antimicrobial peptides including LL-37 . [ 2 ]