单词	heterocyst
释义	heterocyst /ˈhedərəˌsist / noun A large, transparent, thick-walled cell found in the filaments of certain blue-green algae and in certain fungi.Nitrification cannot occur in the presence of oxygen, so nitrogen is fixed in specialized cells called heterocysts.... These heterocysts develop from vegetative cells in a regular pattern along the filament. In the 1970s, purified heterocysts from this strain were used to demonstrate that they are the sites of aerobic nitrogen fixation.
随便看	ballet d'action ballet dancer ballet flat balletic balletically ballet master ballet mistress balletomane balletomania ballet pump ballet shoe ballet slipper Ballets Russes ballett ball float ball-flower ball fringe ball game ballgirl ballgown ball handle ball-handler ball handling ballhawk ballhawking

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。