PNB 2250 Lecture Notes - Lecture 35: Phototaxis, Sensory System, Electric Discharge

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Magnetic fields: angle of magnetic field changes as you approach poles, protects earth against ions from sun, a wide range of animals. Honey bees, sharks, sea turtles, rays, pigeons, salmon, birds, tuna: presence of magnetite. Detection: spatial variation in magnetic field. Field intensity and inclination angle (angle at which field lines intersect earth"s surface) Naturally occurring iron oxide, most magnetic of all naturally occurring minerals. Permanently magnetized over 50 nm in length. Below 50 nm magnetized by external magnetic field: earths magnetic field is strong enough to affect iron oxide, magnetite commonly concentrating in birds beaks. Trigeminal cut-loses ability to detect magnetic field: magnetite is found in hair cells in the ear. With the field it lasts longer: can be detected by cells within the eye, maybe animals see the magnetic field, possibly with the low strength (0. 5 gauss) of earth"s magnetic field.

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