The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
adenoids. 1  one of two masses of lymphatic tissue situated on the posterior wall of the nasopharynx behind the posterior nares. During childhood these masses often swell and block the passage of air from the nasal cavity into the pharynx, preventing the child from breathing through the nose.
thylakoids. Flattened membranous sacs in a chloroplast that are arranged in stacks forming the grana and contain the photosynthetic pigment s. (Figure 16-34) ... Thylakoid. From Wikipedia, the free encyclopedia. Jump to: navigation, search ... A thylakoid is part of an internal membrane system of chloroplasts folded repeatedly into a stack of disks called grana. It contains chlorophyll, which power the formation of NADPH from NADP+ and H+, and enzymes required to form ATP, NADPH, or both in photosynthesis.