chemoreceptor (kÄÂ´mÅrÄsepÂ´tÉr) , n a specialized sensory end organ adapted for excitation by chemical substances (e.g., olfactory and gustatory receptors) or specialized sense organs of the carotid body that are sensitive to chemical changes in the bloodstream.
Nicolaus Copernicus was born on 19 February 1473 in the city of ToruÅ (Thorn), in the province of Royal Prussia, in the Crown of the Kingdom of Poland.His father was a merchant from Krakow krakÃ³w and his mother was the daughter of a Wealthy toruÅ. Merchant nicolaus was the youngest of four. childrenopernicus was born and died in Royal Prussia, a region that had been a part of the Kingdom of Poland since 1466. He was a polyglot and polymath who obtained a doctorate in canon law and also practiced as a physician, classics scholar, translator, governor, diplomat, and economist.
In 1497 Copernicus' uncle was ordained Bishop of Warmia, and Copernicus was named a canon at Frauenburg Cathedral, but he waited in Italy for the great Jubilee of 1500. Copernicus went to Rome, where he observed a lunar eclipse and gave some lectures in astronomy or mathematics.