Second, differences in skin conductance response bring into question what type of reaction takes place after exposure to a very low-level substance.
Surface plasmon resonance imaging (SPRi) has more and more applications in the fields of biology and life sciences due to its unique features of label-free and high-throughput detection and workability in physiological conditions, however it is suffering from insufficient sensitivity, especially in detecting the small molecules or low level of substances.
At low levels the substance damages the sense of smell, so vast numbers of people could be exposed to dangerous levels of the gas without realising it.
Also echoing established findings were limited help-seeking linked to stigma and shame at personal circumstances, low literacy levels, substance abuse issues and cognitive impairment.
The observed low level of alcohol and substance abuse coincides with findings in a UK study [ 4].
The estimated prevalences of alcohol and other substance use disorders in young adults in the present study fit well with the known profile of substance use in the Nordic countries, characterized by a high level of drinking to intoxication and a fairly low level of use of substances other than alcohol [ 53- 56].
Before September 1991, Dr. Benn said, women at his center were identified as facing a high risk of a chromosomally abnormal fetus based on their age or family history, or based on their having a low level of alpha-fetoprotein, a substance in blood.
Another concept associates indicator species with organisms accumulating substances from the surrounding environment so as to reflect natural levels and exposure to these substances Such species are 'bio-accumulators' which are especially useful when concentrating very low levels of a substance.
Low levels of a substance, acetyl-L-carnitine, in the blood are associated with depression.
Menthol makes the smoke from tobacco smoother and less harsh; even non- menthol cigarettes often have low levels of the substance.
America has been adding fluoride to its public water supplies for decades, based on overwhelming evidence that even low levels of the substance can significantly reduce tooth decay, with no major side effects.
