A trace amount of radioactive xenon-133 has already arrived in California at a level one-millionth the dose received from natural sources like bricks.
Also in another location at Ituri forest studied by Torti et al. (2001), the monodominant forests had a lower level (one-third) of nitrogen (ammonium and nitrate) availability in the soil than the mixed forests [9].
The calculation methodology is based on Kane et al. (1979), who evaluated data from 11 sensory irritants and concluded that a level one-hundredth of the RD50 would produce "minimal or no sensory irritation" in humans.
PERSONAL SPACES: There are two bedrooms on the third level, one on the second level and an au-pair suite on the lower level.
Bayonne, N.J., had levels one-third higher than the Federal standard on Wednesday.
On Wednesday, Kennebunkport, Me., recorded ozone levels one-third above the Federal health standard.
Alongside low and sometimes illegal pay levels, one-third of social care workers are employed on zero-hours contracts.
A study recently published in the journal NeuroToxicology found that pregnant women in Old Order Mennonite communities, which eschew many modern conveniences, had urinary BPA levels one-fourth the national median.
He said the tests showed a correlation between how much fish people ate and their mercury levels: One-third of people who ate canned tuna four or more times a week, for example, had mercury levels above Environmental Protection Agency recommendations.
Furukawa & Middlebrooks (2001) reported that nearly two-thirds of A2 neurons in cats exhibited response suppression in background noise, but at lower noise levels, one-third of the neurons showed enhancement of responses.
