Fahrenheit reference points became popular following the work of Anders Celsius and these fixed points were adopted by a committee of the Royal Society led by Henry Cavendish in 1776. Under this system, the Fahrenheit scale is redefined slightly so that the freezing point of water is exactly 32 °F, and the boiling point is exactly 212 °F or 180 degrees higher. It is for this reason that normal human body temperature is approximately 98° (oral temperature) on the revised scale (whereas it was 90° on Fahrenheit's multiplication of Rømer, and 96° on his original scale). The Rankine temperature scale was
Puccinia melanocephala plant. The uredospores then germinate on the sugarcane leaves, develop appresoria, and infect the new host plant via penetration of the plant's stomata. This cycle can be repeated throughout the year because sugarcane is grown almost exclusively in areas where the climate is conducive to growth of Puccinia melanocephala throughout the year. Puccinia melanocephala infection is non-systemic. Puccinia melanocephala develops optimally at temperatures between 16 and 25 degrees Celsius (60.8 to 77 degrees Fahrenheit). However, germination of the infectious uredospores occurs at optimal levels between 21 and 26 degrees Celsius (69.8 to 78.8 degrees Fahrenheit). Germinated uredospores require at least