A ball-and-stick model structure of basic (positively-charged) amino acid arginine (Arg, R). Carbon in blue-grey, oxygen in red, nitrogen in green, hydrogen in silver. Drawn in Inkscape. 氨基酸 氨基 酸 精氨酸 (氨基酸)
A ball-and-stick model structure of basic (positively-charged) amino acid lysine (Lys, K). Carbon in blue-grey, oxygen in red, nitrogen in green, hydrogen in silver. Drawn in Inkscape. 氨基酸 氨基 酸 赖氨酸 (氨基酸)
green cartoon power energy generation safe wind turbine positive good environmental turbines Energy Positive Wind Turbine Green clip art 能源 积极 风 能源积极风力涡轮绿色剪贴画