[The ultrafine structure of Nosema apis].
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The haemolymph levels of trehalose, glucose and fructose in foraging worker bees, have been compared in 4 different colonies of each of the following races: mellifica (M), ligustica (L), caucasica (C) and their hybrids. Significant differences were found between races, with increasing values in the order: L leads to M leads to C leads to (L X C) X M; in the extreme cases, the amplitude of those differences reached a 1 to 4 range for glucose and 1 to 5 for fructose. The trehalose levels showed lower variations and did not follow the heterosis effect observed in hybrids.
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