A magnetoresistive sensing device is provided. Incorporation of small quantities of isovalent oxygen leads to the formation of a narrow, oxygen-derived band of extended states located within the band gap of the Zn1-yMnyTe host. The method includes determining when a pressure level in the container is greater than a threshold pressure level. The invention further relates to the inbred and hybrid genetic complements of plants of variety CV684080. The method comprises the step of coating the oxidizable particle with a first compound and then reacting the first compound with a second compound to form a third compound, wherein the third compound promotes the reaction of the oxidizable particle with oxygen.