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.
DVR or PVR: Personal Video Recorder or more commonly called now a DVR, digital video recorder has a computer style hard drive for digitally recording satellite television programs. There are three types of DVRS for DIRECTV. Ultimate TV is a discontinued DVR format. Ultimate TV was in part developed by Microsoft.