The transition from a dive or spin to substantially normal flight,
The controlling effects of the length of day on such phenomena as the flowering of plants, the reproductive cycles of mammals, migration and diapause of insects, and seasonal changes in the feathers of birds and the hair of mammals,
1 An enclosed court in a building. 2 A colonnade or arcade.
Negatives made with emul
Ending in a point stiff and sharp enough to prick. Also, acrid to taste,
Large hot- cathode vacuum tube for industrial use, with one or more grids,
A crystal used as a standard of frequency, controlling an electronic oscillator,
Operation of a multicavity magnetron, whereby voltages on adjacent segments of the anode differ by n radians half-cycle,
Water-soluble polymer having a pyrrolidone cyclic unit as a pendant side group in the repeat unit. Widely used in cosmetic products, and as a copolymer with methyl methacrylate etc in cross-linked soft contact lenses. The polyvinyl pyrrolidone part helps the lens swell in eye-fluid,
A structure found in glassy igneous rocks, which consists of systems of spheroidal concentric cracks produced during cooling.