But there's always adventitious presence, which means small amounts of unintentional presence through pollen flow and physical mixing".
This distribution pattern results from a combination of biological oxygen utilization and physical mixing of the ocean waters.
Physical mixing in the oceans (thermohaline and wind-driven circulation) tends to homogenize the chemical composition of seawater.
However, the XRD results suggest that two hydrated salts are only simple physical mixing.
Typically, polymer-inorganic TE nanocomposites are produced by physical mixing, solution mixing and in situ polymerization.
The new ODT was prepared by physical mixing of rapidly disintegrating granules (RDGs) with MEC.
But the physical mixing during freeze thaw cycles, in combination with sediment deposition over hundreds and thousands of years, has buried permafrost carbon many metres deep.
Two different doping routes, i.e., the physical mixing (PM) and in situ synthesis (ISS) were considered.
The opposing influences of physical mixing and of biogeochemical input and removal mechanisms result in a substantial variety of chemical distributions in the oceans.
Zn Ti-based sorbents promoted with cobalt and nickel additive were prepared by simple physical mixing of single oxides.
The hyporheic zone is defined to be the zone of physical mixing of river and aquifer water.
