See also: Dealing with Breathing Problems written for patients. The term hyperventilation describes excessive ventilation of the lungs, beyond what is required to achieve normal arterial blood gases.
A light frost occurs when the temperature drops to below 32 degrees Fahrenheit, and refers to the conditions that allow a layer of ice crystals to form when water vapor condenses and freezes without first becoming dew. Harvest basil and other tender herbs before a light frost (when the temperature drops to 32 degrees Fahrenheit). 2  Even if they survive the frost, they don't do well in cold temperatures. 3  The same is true for most annuals.
Plant injury and death can occur with prolonged exposure to temperatures below T min or above the maximum temperature (T max; the temperature at or above which the flowering rate is zero) from irreversible damage to the photosynthetic apparatus and cell membranes (Lie and Huang, 2000 and Raison et al., 1980).lant injury and death can occur with prolonged exposure to temperatures below T min or above the maximum temperature (T max; the temperature at or above which the flowering rate is zero) from irreversible damage to the photosynthetic apparatus and cell membranes (Lie and Huang, 2000 and Raison et al., 1980).