The third factor is the oxygen level and demand. While most organisms require oxygen for metabolism, others are anaerobic or strict anaerobes and therefore cannot survive when trace amounts of oxygen are present. The last major factor that must be taken into account is the pH level of the contaminant. Only fungi can survive in low pH level environments while most other microorganisms will only survive under a pH level of seven. For this reason, fungi are the choice microorganisms for most bioremediation processes involving waste organic matter, because of its acidity.
Personal transportation is truly a marvel of the twentieth century. . .
Roller coasters can exert G forces greater than one. . . Virtual images are superimposed on views of the real world. . . A feeling that many describe as one similar to flying . . . A bar code is a printed series of parallel modules . . . It plays a crucial role in the operation of computers . . .