Low levels of a substance, acetyl-L-carnitine, in the blood are associated with depression.
Analysts expect corn prices, down to about $6 a bushel from $8 a bushel, to stabilize but not return to the low levels of a few years ago.
In addition, he said, it is hard even to find people who may have been exposed to low levels of a pollutant 10 or 20 years ago.
A third sample, taken by Wang and tested four months later, found low levels of a toxin – not enough, it seemed, to kill.
This is especially true if one identifies subsets of cells on a fluorescence-activated cell sorting profile that express high or low levels of a marker.
This illness is caused by low levels of a messenger molecule called dopamine in certain parts of the brain.
For example, Dr. Hendler said, low levels of a class of carotenoids are correlated with age-related macular degeneration.
Children who show a propensity for extreme aggression at young ages often have low levels of a hormone produced by the body during times of fear or stress, researchers have found.
Her lawyers reportedly said Wang Lijun took two blood samples yet found no traces of poison, while a third sample that he took – tested only four months later – found low levels of a toxin, apparently insufficient to kill.
Pregnant women were not only exposed to 2, 4, 5-T but to low levels of a highly toxic contaminant of it, the dioxin known as TCDD, which is known to have severe toxic effects on laboratory animals, including miscarriages.
In Thursday's issue of the journal Science, two teams of researchers published studies suggesting that low levels of a common pesticide can have significant effects on bee colonies.
