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When the aurora becomes active, the arc develops five pleats that appear as
vertical striations called rays; an arc with rays is called a rayed arc. In a more acV.
P. Hessler Figure 2: Aurora borealis. Multiple auroral arcs photographed in
These currents, originating in active membrane, are functionally significant very
close to their site of origin but must be considered incidental at any distance from
it. In the electric fish, however, adaptations have occurred so that this otherwise ...
The most active white cells in insects, called plasmatocytes, can spread either
over surfaces of parasites forming membranous capsules or over foreign
particles; often they become granular. There are at least five other types of
hemocytes in ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review