phase variation

phase variation

a mechanism of differential gene regulation found in Salmonella whereby two alternative forms of the flagellin gene, H1 and H2, are expressed.
References in periodicals archive ?
One such adaptive process is phase variation - a random, frequent and reversible ON/OFF switching of contingency genes generating phenotypical variations within the bacterial population.
This minimal phase change is essential because amplitude and phase variation following VNA calibration can cause inaccurate S-parameter measurements.
The FCN amplitude and phase variation of the three FCN models are similar.
iii) Phase variation among bacterial strains may result in colony semblance making it difficult to identify the microbe (Fig 2)
However, both methods yields approximated result, fail under large mean, and phase variation.
1Error], calculated each business cycle in the phase 1, corrected phase variation [R.
Phase variation has been associated with variation in other B.
The necessity of the phase variation term is due to the cylindrical waves which are crossing through the flaring part.
Moreover, keeping the phase variation low with frequency preserves the linearity of the phase shifting elements over a large bandwidth.
One such application is a metamaterial based Fabry-Perot cavity which is composed of perfectly electrically conducting (PEC) ground and PRS to control the phase variation was used to realize a compact and steerable antenna with an improvement of gain about 1.
In the experiments, both groups used continuous-wave lasers, with a wavelength of 532 nanometers for Zhang's group and 633 nanometers for the French group, shining them through spatial tight modulators with phase variation calculated using special computer programs.
The unit cell having two holes achieves phase of 250[degrees], unit cell with three holes achieves 300[degrees], and finally the unit cell having four holes achieves 360[degrees] reflection coefficient phase variation.