Definition of diastereomer. : a stereoisomer of a compound having two or more chiral centers that is not a mirror image of another stereoisomer of the same compound â compare enantiomer.
Most perennial weeds such as Johnsongrass. are also suppressed although vigorous plants or heavy in-. festations may lift plastic. Perennial sedges, and to a lesser. extent, grasses can puncture sheet mulches as the weeds. emerge from the soil, resulting in inadequate control.
Rigid Foam. Rigid foam boards are the wider category of foam insulation to which fanfold board belongs. Any type of foam board is a type of rigid foam insulation. Rigid foam boards are easier to install than spray foam and can be used as underlayments for surface materials such as walls, siding and flooring.