Today’s article

term: nano-


a prefix in the international system of units (SI metric system) that denotes the 10–9 part of an object (e.g., nanometer: 1 nm = 10–9 m).


The prefix "nano-" originated in Ancient Greece (Greek ηαηοσ — midget). In Latin, nano means "small", "tiny". Lately, the prefix has frequently been used to denote something "relating to nanoscale" or "relating to nanotechnology".

At the same time, some terms beginning with "nano-" have no connection to nanotechnology (e.g., nanosecond — 10–9 sec, nanosatellite — satellite weighing below 10 kg, etc.).

Today’s picture

term: chelate



coordination compounds composed of atoms (or ions) and polydentate ligands.


The term derives from Latin chelate meaning a claw. To form the chelate, a ligand is needed with at least two donor sites bound with the central atom. The number of such sites is called the ligand denticity. The ligands forming chelate rings are called chelating agents (chelants, chelators). ...