A proportion used in determining the dimensional relationship of a representation to that which it represents: a world map with a scale of 1:4,560,000. b. A calibrated line, as on a map or an architectural plan, indicating such a proportion.
Yttria (yttrium oxide, Y 2 O 3), was discovered by Johann Gadolin in 1794 in a mineral called gadolinite from Ytterby. Ytterby is the site of a quarry in Sweden which contains many unusual minerals containing erbium, terbium, and ytterbium as well as yttrium.
Dysarthria is a feature of many neurological diseases including cerebral palsy, stroke, traumatic brain injury, Parkinson s disease, Amyotrophic Lateral Sclerosis (ALS) and multiple sclerosis. Dysarthria is a relatively common symptom of multiple sclerosis and can take many forms.Episodic paroxysmal dysarthria, which is where the dysarthria lasts for up to a minute or so and recurs several times a day, is particulary common in MS.ysarthria refers to speech problems that are caused by the muscles involved with speaking or the nerves controlling them. Both muscle weakness and incoordination can give rise to dysarthria. Speech problems that result from cognitive dysfunction are not dysarthria.