Assertion: boron | /r/HasProperty | harmful
Facets:
value: to humans
type: TRANSITIVE-OBJECT
value: at concentrations
type: LOCATION
Source sentences:
text: Can boron be harmful?
text: Boron is basically a plant micro-nutrient, as far as we know boron is harmful to humans.
text: However, it is harmful at concentrations greater than 1.0 mg/L.
text: Boron is basically a plant micro-nutrient, as far as we know boron is harmful to humans.