This disclosure is directed to information management techniques that may be used during automated processing of biological growth media. The toner has, in a DSC curve obtained by measuring the toner with differential scanning calorimeter, a glass transition temperature measured in a first scan of 50. These nodes are referred to as \u201croot\u201d nodes herein. A microprocessor or other logic, powered by a battery, can control the LEDs, possibly of different colors, to generate various colors or patterns for display. A method of preparing the fuel cell catalyst uses electron beams having low energy so that it can provide a desirable catalyst uniformly in a simple and economical process, as well as releasing few X-rays so that the catalyst can be mass produced. The polarizing plate can satisfy durability and display uniformity.