The diseases have been categorized as patches (cause dead spots or patches in the lawn), rings (cause rings of dead or affected grass), or leaf blight (affect individual blades of grass, often over a wide area and no distinct patch or ring pattern may be noticeable).
PVR, abbreviation for pulmonary vascular resistance. To measure changes in blood vessel size or changes in gas volume in the lungs to assist in diagnosing diseases such as deep vein thrombosis (DVT), chronic obstructive pulmonary disease (COPD), and some peripheral vascular disorders. Veins, arteries, and lungs. None.
PVC is a rigid plastic pipe made of polyvinyl chloride; it can be used with cold but not hot water, and for residential use PVC is primarily installed as drain/sewer or irrigation/sprinkler pipes rather than as an incoming water distribution system.VC is a rigid plastic pipe made of polyvinyl chloride; it can be used with cold but not hot water, and for residential use PVC is primarily installed as drain/sewer or irrigation/sprinkler pipes rather than as an incoming water distribution system.