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.
VSEPR and Molecular Geometry. VSEPR stands for Valence Shell Electron Pair Repulsion, which is a theory that chemists use to predict the shape and bond angles of different molecules. VSPER is pronounced ves-per in everyday use.Basically, the theory says that the valence electron pairs around an atom repel each other mutually.SEPR stands for Valence Shell Electron Pair Repulsion, which is a theory that chemists use to predict the shape and bond angles of different molecules. VSPER is pronounced ves-per in everyday use.