A gram stain is a type of microbiology or laboratory test that determines whether bacteria are present. It also determines whether bacteria are gram negative or gram positive. The difference between gram negative and gram positive bacteria can be important when determining appropriate treatment for an infection.
Globally, the available ecologically productive land area included in the Ecological. footprint analysis is 1.89 hectares for each person. The footprint takes into account fossil. fuel use, cropland, forests, nuclear and hydroelectric power, fisheries and buildings.
The 'ecological footprint' of the USA is about double that of the EU for about the same population, and is nearly four times that of China (which has nearly four times the population, (and so the ecologicical impact per person is just about 14 times as high in the USA, compared to China).