The grana cheese known as Parmesan is not now so well made at Parma as in some other parts of Italy - Lodi, for example.
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The carbonyl group by itself does not produce colour, but when two adjacent groups occur in the molecule, as for example in the a-diketones (such as di-acetyl and benzil), a yellow colour is produced.
The second (so-called " first ") abdominal segment is often very constricted, forming the " waist " so characteristic of wasps and ants for example.
Some of these - the Hydrometridae or pond-skaters, for example - move over the surface-film, on which they are supported by their elongated, slender legs, the body of the insect being raised clear of the water.
