TO RETAIN, practice. To engage the services of an attorney or counsellor to manage a cause, at which time it is usual to give him a fee, called the retaining fee. The act by which the attorney is authorized to act in the case is called a retainer.
One explanation for the difference in the levels of catechins found in this study and others is the type of samples used. In comparative studies, leaves of Camellia sinensis 4 Discussion Table 1. Levels of catechins and caffeine in tea bags, extract, and ready-to-drink green tea.
Tea extract. 1  Other names: Camellia sinensis, green tea, green tea extract, black tea, chai, cha, oolong tea. 2  Plant part(s) used: Leaf or shoot. 3  Naturally occurring caffeine dose: 4.8-9.3 percent9. 4  What you need to know: Ever since ephedrine was removed from the industry, the use of tea extracts has increased exponentially.