The phrase "natural defence" is correct and usable in written English.
It is usually used to refer to a defence mechanism that is innate to a particular species and which does not require any conscious response or learning. For example, "The opossum has adapted a natural defence of appearing to be dead when attacked by predators."
"The water is used here," he gesticulates, "as a natural defence.
He described water surrounding the island nation of Australia as part of its "natural defence".
This build-up leads to an "over-activation" of a natural defence mechanism that stops essential proteins being produced.
Nanoparticles hidden inside hollowed-out red blood cells could escape detection by the body's natural defence mechanisms, allowing them to perform myriad therapeutic applications.
He suggested that the greater damage organic crops are exposed to from pests makes them produce more phenolic compounds (antioxidants) as part of their natural defence system.
Leadsom wrote to environmental NGOs in late October, stating: "I fully support natural defence initiatives such as planting trees, which can slow the flow of water".
The gene normally encodes a protein that helps the body's cells resist viral infection, but this natural defence is impaired in people who carry the mutated version of the gene.
Carol Colton, a professor of neurology at Duke University in North Carolina, said the results were "exciting", but added that critical questions remained about whether switching off a natural defence mechanism might have other unforeseen downsides in the brain.
Instead, Prof Mallucci argues, the damage really occurs when a natural defence mechanism in the brain responds to the accumulation of plaques by switching off the production of all new proteins, wrecking the brain's ability to carry out essential repairs.
It views NATO as the natural defence arm not only of Europe but of everything affecting the West, and therefore wants it to be the main instrument for dealing with terrorism and weapons of mass destruction.
