Scanning electron microscope image showing pearl-like calcium granules (PCGs) accumulated within the lumen of the distal region of the Malpighian tubule in the fruit fly larva. Numerous PCGs, each ...
IT is now well recognized that growth and moulting in the insect are initiated by a hormone produced in the neurosecretory cells of the brain. This brain factor activates the thoracic gland, which is ...
DURING the last fifteen years it has been proved that the processes of growth and reproduction in insects are controlled by hormones circulating hi the blood. In some instances the source of these ...
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