Left to free competition alone, genetic selection tends to be concentrated among a few companies, the number of varieties placed on the market is restricted and local varieties disappear.
EdiTheial note: thistoryry has been updated from a previous version.
On the other hand, because of the strong directional selection that a highly resistant variety places on the extant pathogen population (leading to the immediate death of uninfective propagules), a novel mutant capable of infecting that variety is at a major selective advantage having a new untapped resource to exploit.
Typically the seabed in deep water comprises soft, lightly overconsolidated, fine grained sediments, which must support a variety of infrastructure placed on the seabed or anchored to it.
Other types, such as the apple, egg and turban-shaped varieties, can be placed on slatted trays or hung up in ventilated bags.
As a species, B. sphaerocarpa is not considered to be under threat, but two of the five varieties, have been placed on the Declared Rare and Priority Flora List.
In Nepal, Pakistan, and Bangladesh, a variety of substances are placed on the cord to facilitate drying up and separation of the umbilical stump.
For example, ultra-accurate clocks were placed on a variety of commercial airliners flying at one-millionth the speed of light.
Meteorological observations have historically been made at a variety of places: on board naval and commercial shipping vessels, at magnetic observatories, lighthouses, ports, hospitals, and aerodromes, to name but a few.
Emphasis is placed on the variety of reactions beyond acid catalysis: cracking, dehydrogenations, oxidations and particularly clean technology applications, especially De NOx, which can be carried out in PILCs.
