Examples of sub-zero

• The study of the physiological characteristics of microorganisms under conditions of sub-zero temperatures is complicated due to the low rate of metabolic processes.

• Predictions of longevity at sub-zero temperatures based on rotational motion indicated longer survival times than those based on the viability equation.

• One recommendation is to keep them at a sub-zero temperature in oxygen-free chambers.

• Fire is a particular hazard in sub-zero temperatures because liquid water is at a premium and special facilities must be established to maintain sufficient water to fight a fire.

• The television cameramen were also keen to help us to ensure that the games went ahead, and both matches were played in sub-zero temperatures.

• This unprecedented programme has required extraordinary efforts by thousands of railway workers, through the most difficult conditions of floods, snow and sub-zero temperatures.

• The requirement for seven consecutive days of sub-zero temperatures is ludicrous.

• For five out of the seven days the daily average temperature was sub-zero.