THE SULFUR-OXIDIZING PROKARYOTES. Biological oxidation of hydrogen sulfide to sulfate is one of the major reactions of the global sulfur cycle. Reduced inorganic sulfur compounds (referred to below as sulfur) are exclusively oxidized by prokaryotes, and sulfate is the major oxidation product. Sulfur oxidation in members of theEukarya is mediated by lithoautotrophic bacterial endosymbionts (44).
In simpler terms: the dew point, or frost point, is the temperature at which dew or frost will form should the air temperature fall sufficiently. Other things being equal, as the temperature falls, the relative humidity rises, reaching 100% at the dew point, at least at ground level.ew point temperature is never greater than the air temperature, since the relative humidity cannot exceed 100%.
Atmospheric air contains some moisture in the form of water vapour. HUMIDITY is the amount of water vapour in the air. (I know what you are thinking - yes, even the Sahara Desert has an annual average of 25% relative humidity) RELATIVE HUMIDITY is the amount of water vapour in the air relative to what the air can hold. Warm air can hold more moisture than cold air. For instance, let's say that a certain parcel of air can hold 30 grams of water vapour per cubic meter, but has only 15 grams of water vapour per cubic meter of air when measured.