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Severe osmotic-upshift (up to 30% sodium chloride [w/v]; reaches maximum saturation of sodium chloride in BHI) did not result in inactivation patterns comparable to those observed with the other three lethal stress conditions (data not shown) and was therefore not used as lethal stress.
When bacteria are exposed to external osmotic upshifts, the passive loss of intracellular water (up to 70%) increases the molar concentrations of intracellular macromolecules.
The way it works is that you can toggle the shift lever left for downshifts or right for upshifts, and the transmission is specifically designed to hold a gear right up to redline, so there's no back-end loosening upshift just as you happen to be scorching through the apex of a hairpin turn.
This result explains the observation that the expression of the genes in pHsh vectors, e.g. pHsh-xynB (Fig. 6C), can last for up to 6 hours to reach high levels, while in natural E. coli cells, heat-shock protein synthesis rates normally peak at about 5 min after a temperature upshift and then rapidly decline to a steady-state level at ambient temperature [29].
Gears can be changed only in numerical order; it is not possible to upshift from first to third or downshift from fourth to second.
Pull the right paddle to upshift, the left to downshift.
We next performed experiments using a strain of worms engineered to express human AD-associated Aß peptide within body wall muscle upon temperature upshift from 16° to 25°C, which leads to paralysis of all worms by 32 hours after upshift [ 65]. Figure 10B shows the paralysis over time in these worms in the presence and absence of βHB treatment.
Similarly, the expression of FLO11 failed to respond under upshift from starvation to inducing concentration of ammonium sulphate, which resulted in an irreversible response (see Figure 8b).
The upshift due to the residual weak charging can be estimated to be less than 2 cm–1 (ref (5)) and can be neglected.
Moreover, ligB a paralogous gene to ligA, was up-regulated by an overnight temperature upshift from 30°C to 37°C (1.7-fold).
Animals were upshifted to the restrictive temperature prior to oogenesis to ensure that oocytes would be trapped in M phase immediately after exiting from pachytene.
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