Likely a sterile medium means an uncontaminated culture (food free of living organisms) that will grow only the new bacteria introduced for analysis. Source(s): http://www.thefreedictionary.com/sterile
Stonepelt was Bluestar's first mentor and a very well-respected senior warrior of ThunderClan. It is revealed in this book that he took her to the Gathering on her second day as an apprentice because she had caught a squirrel very well for a new apprentice, and the squirrel had been as big as she was.
Golden Heart, Broken Warrior. Sockclaw was a warrior who had ambition and passion for what he did. He fought tooth and claw every moon for his Clan, against rogues, badgers, foxes, dogs, and the other Clans. He knew what he did was honorable, and he was proud. He didn't brag, he didn't let his ego blow up. He was just a ...