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Neurosecretory A cells in the pars intercerebralis of 0. fasciatus were identified at the ultrastructural level. Fine structural study of the A cells of female insects during the period of production of the first batch of eggs revealed that these cells undergo qualitative and quantitative changes during the first eight days of adult life. The A cells appear to be inactive in the newly emerged females. There is a significant depletion of neurosecretory granules (NSG) in the perikarya in the 2-day-old females followed by an increase and decrease in the 4-and 6-day-old females, respectively. The A cells in the 8-day-old females showed an accumulation of NSG. The mitochondria1 population increases after adult emergence reaching a peak in the 4-day-old females, and then declines gradually in the subsequent age groups. The effect of sublethal dose of gamma radiation on the ultrastructure of the A cells was also investigated. Radiation damage is evident as early as four hours after irradiation with 10 kR. There is considerable swelling of the lysosomes and the membrane system in the A cells of irradiated insects. Synthetic activity of the A cells, based on the distribution of the endoplasmic reticulum, Golgi complex and mitochondria, as well as release of the NSG are apparently inhibited after irradiation. Radiation-induced damage becomes more conspicuous as post-irradiation interval increases.It is surmised that the damage to the A cells might have contributed a t least in part, to the failure of yolk deposition in the irradiated insects.The fine structure of the median neurosecretory cells (MNC) of insects has been described by several investigators (Novak, '75). However, little is known on the ultrastructural changes associated with the cyclic activity of the cells during adult life. Among Heteroptera, the fine structure of the MNC has been described only for the adult (Unnithan, '71, '72) and the embryonic stages (Dorn, '75) of Oncopeltus fasciatus and starved fifth instar nymphs of Rhodnius prolixus (Morris and Steel, '75).I t has been reported that the median neurosecretory cells influence fecundity and corpus allatum activity (Johansson, '58) and O2 con- Nair ('75) studied the dynamics of these cells over the first eight days of adult life by microspectrophotometry after staining with paraldehyde fuchsin or alcian blue 8 GX. Their data showed that a t any one time during the first eight days of adult life, these cells did not differ from one another with respect to their area, or to the amount of stainable material within them. Moreover, their data also showed cyclic activity in these cells during adult life. The electron microscope study revealed different types of neurosecretory cells (Unnithan et al., '71; Unnithan, '72), but it was not possible to correlate these cell types with the different types of cells described by Johansson ('58) a t the light microscope level.The purpose of the present investigation was to identify the A cells, of 0. fasciatus a t the ultrastructural level and to find out '
Neurosecretory A cells in the pars intercerebralis of 0. fasciatus were identified at the ultrastructural level. Fine structural study of the A cells of female insects during the period of production of the first batch of eggs revealed that these cells undergo qualitative and quantitative changes during the first eight days of adult life. The A cells appear to be inactive in the newly emerged females. There is a significant depletion of neurosecretory granules (NSG) in the perikarya in the 2-day-old females followed by an increase and decrease in the 4-and 6-day-old females, respectively. The A cells in the 8-day-old females showed an accumulation of NSG. The mitochondria1 population increases after adult emergence reaching a peak in the 4-day-old females, and then declines gradually in the subsequent age groups. The effect of sublethal dose of gamma radiation on the ultrastructure of the A cells was also investigated. Radiation damage is evident as early as four hours after irradiation with 10 kR. There is considerable swelling of the lysosomes and the membrane system in the A cells of irradiated insects. Synthetic activity of the A cells, based on the distribution of the endoplasmic reticulum, Golgi complex and mitochondria, as well as release of the NSG are apparently inhibited after irradiation. Radiation-induced damage becomes more conspicuous as post-irradiation interval increases.It is surmised that the damage to the A cells might have contributed a t least in part, to the failure of yolk deposition in the irradiated insects.The fine structure of the median neurosecretory cells (MNC) of insects has been described by several investigators (Novak, '75). However, little is known on the ultrastructural changes associated with the cyclic activity of the cells during adult life. Among Heteroptera, the fine structure of the MNC has been described only for the adult (Unnithan, '71, '72) and the embryonic stages (Dorn, '75) of Oncopeltus fasciatus and starved fifth instar nymphs of Rhodnius prolixus (Morris and Steel, '75).I t has been reported that the median neurosecretory cells influence fecundity and corpus allatum activity (Johansson, '58) and O2 con- Nair ('75) studied the dynamics of these cells over the first eight days of adult life by microspectrophotometry after staining with paraldehyde fuchsin or alcian blue 8 GX. Their data showed that a t any one time during the first eight days of adult life, these cells did not differ from one another with respect to their area, or to the amount of stainable material within them. Moreover, their data also showed cyclic activity in these cells during adult life. The electron microscope study revealed different types of neurosecretory cells (Unnithan et al., '71; Unnithan, '72), but it was not possible to correlate these cell types with the different types of cells described by Johansson ('58) a t the light microscope level.The purpose of the present investigation was to identify the A cells, of 0. fasciatus a t the ultrastructural level and to find out '
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