aThe reason of higher sinkage at a lower sedimentation period (24 hours) may be due to partial settlement of soil particles and loose condition of soil while a gradual decrease at a higher sedimentation period is due to increase in hardness of soil surface. 更高的sinkage原因在一个更低的沉积...
as the theory's name implies, "bed air"-were responsible for making people sick. Consequently, during the 1854 outbreak of cholera in Westminster, London, doctors and government officials alike blamed "miasmatic particles" released into the air by decaying organic matter in the soil of the River...
Note that, because viruses require host cells in order to replicate, many scientists do not consider viruses to be alive (and hence they are not considered to be organisms). Despite that, because viruses are small and many cause disease, they are ...