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.
1 Rigid panels of insulation. 2  Can be used to insulate almost any part of your home, from the roof down to the foundation. 3  Polystyrene and polyurethane are the most common types of materials used in making foam board.  Sheathing reduces heat conduction through structural elements like wood and steel studs.