A polyphenol increasing agent for plant leaves, a polyphenol and amino acid increasing agent for plant leaves, a resin pellet, a plant leaf storage sheet, and a method for manufacturing a plant leaf storage sheet which can improve the storability of the plant leaves such as leafy vegetables and tea leaves are provided. A first local area network has a first local area ethernet switch and is connected to one of the interconnected network ethernet switches. A gate bias voltage circuit section supplies a gate bias voltage to the high frequency power amplifier circuit. The edit may affect an adjacent word in some instances, such as when two adjacent words are merged. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of diseases such as, for example, COPD.