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.
Problems not limited to two dimensions, such for example as the shadow of a circular disk, present great difficulties, and have not hitherto been treated by a rigorous method; but there is no reason to suppose that Fresnel's results would be departed from materially.
