The negative stain is particularly useful for determining cell size and arrangement. It can also be used to stain cells that are too delicate to be heat-fixed. We use nigrosin as our negative stain. Nigrosin is an acidic stain.
To 2040 A.D. Until late 2006, global temperatures were more than a degree Fahrenheit warmer when compared to the 20th Century average. From August of 2007 through February of 2008, the Earthâs mean temperature dropped to near the 20th Century average of 57 degrees.
The world has mainly grown hotter since 1980, at a rate of nearly 0.2 Â°C (0.36 Â°F) per decade. The annual global temperature from 2000 to 2009 was 0.61 Â°C (1.1 Â°F) higher than the average temperature for 1951 to 1980. If the current rate of increase continues, the world will warm by 2 Â°C (3.6 Â°F) in the next century.