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.
Instead, these goddesses began to diverge. During the 22nd Dynasty (c. 945â715 BC), Bast had transformed from a lioness warrior deity into a major protector deity represented as a cat. Bastet, the name associated with this later identity, is the name commonly used by scholars today to refer to this deity.