Fahrenheit He then re-calibrated his scale using the melting point of ice and normal human body temperature (which were at 30 and 90 degrees); he adjusted the scale so that the melting point of ice would be 32 degrees and body temperature 96 degrees, so that 64 intervals would separate the two, allowing him to mark degree lines on his instruments by simply bisecting the interval six times (since 64 is 2 to the sixth power). Fahrenheit observed that water boils at about 212 degrees using this scale. The use of the freezing and boiling points of water as thermometer fixed
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