Hypoxia-Ischemia, BrainNeuroprotective AgentsAnoxiaAnimals, NewbornPlethysmography, Whole BodyHypoxia, BrainBrain IschemiaRats, Sprague-DawleyIschemiaCell HypoxiaPia MaterHypercapniaBrainCell DeathDisease Models, AnimalNeuronsMyocardial IschemiaHypotensionRats, WistarCerebrovascular CirculationReperfusion InjuryInfarction, Middle Cerebral ArteryIschemic Attack, TransientGerbillinaeHippocampusCell SurvivalIschemic PreconditioningNerve DegenerationCytoprotectionTime FactorsCerebral CortexCells, CulturedN-MethylaspartateNeurotoxinsGlutamic Acid