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_______________________________________ This paper reviewed work on aphid polymorphism, concentrating particularly on the complex of environmental factors, such as photoperiod, tempera. ture, food, degree of crowding, etc., that control the seasonal production of sexual and parthenoge-netic morphs and the development of winged and wingless females. [The SC!(More)
Dopamine deficiency is characteristic of Parkinson's disease (PD) and treatments aim at elevating levels by administration of its precursor L-dihydroxyphenylalanine (L-DOPA), or inhibiting monoamine oxidases (MAOs), thus preventing its breakdown. Reports of improvements in PD patients treated with Banisteriopsis caapi extracts stimulated investigation of B.(More)
The location of the photoperiodic mechanism controlling the production of the sexual and parthenogenetic morphs by apterous parents was examined by selectively injuring the brain with an R.F. microcautery. Lesions destroying the Group I neurosecretory cells (NSC) in the protocerebrum abolished the response to changed daylength. Extensive damage to other NSC(More)
  • A D LEES
  • 1964
Although the photoperiodic reactions of insects and mites have been studied quite extensively (Lees, 1955; de Wilde, 1962), the site of the photoreceptors is still unknown. The light pathway does not seem to involve the eyes. Thus Tanaka (1950) observed that the photoperiodic control of diapause in the silkworm Antheraea pernyi was not affected by(More)