The quantification of microbial growth inhibition was determined by measuring the diameter of clear zones of microbial growth around the wells in the agar (including the well itself).
Here, we used the phospholipid fatty acid (PLFA) analysis to explore the effects of soil ameliorants on microbial communities within mega-aggregates (diameter of >2 mm, ME), macro-aggregates (diameter of 0.25 2 mm, MA), and micro-aggregates (diameter of <0.25 mm, MI), based on an 8-year rice (Oryza sativa L). field experiment.
After incubation at 37 °C for 16 18 h, the diameter of the zone of microbial growth inhibition around the antimicrobial disk was measured in millimeters.
For all previous cases we assumed the maximum microbial density to be 1 cell/μm2 using the average diameter of bacterial cell of 1 μm.
The initial microbial concentration is 2.73 × 104 cells/ml, the mean diameter of oil droplets is 100 μm, and the CV value is 0.8.
Results revealed that at these typical oil and microbial concentration levels, higher maximum microbial density at the interface can result in higher rates of biodegradation only if the mean diameter of oil droplets is larger than 100 μm. Figure 6 compares the conversion factor X and microbial growth with mean oil droplet diameters of 100 (left column) and 100 μm (right column).
With the mean diameter of 100 μm, the biodegradation rate increases with increasing the maximum microbial density at the water-oil interface.
The thinner the better, about the diameter of a dime.
At 12,104km across, Venus has 95% the diameter of Earth.
It weighs 35 pounds & has a diameter of 20 inches.
