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Using a postembedding immunogold electron microscopic method, the ultrastructure and synaptic connections of FMRFamide-like immunoreactive varicosities were investigated in different peripheral organs of the snail Helix pomatia, including the heart (auricle), intestine, hepatopancreas, upper tentacle and salivary gland. The FMRFamide-like immunoreactive(More)
The ultrastructure and synaptic connections of FMRFamide-like immunoreactive neurons were investigated in the CNS of the snail Helix pomatia, following the application of a post-embedding immunogold method. For comparison, first, we analyzed the ultrastructure and granule content of the identified FMRFamide-containing C3 neuron in the cerebral ganglion.(More)
Both allatostatin immunoreactivity (AS-IR) and FMRFamide immunoreactivity (FMRFa-IR) have been demonstrated light-microscopically in the lateral heart nerve of Periplaneta americana. The identifical labeling of some fibers suggests the coexistence of the two antigens. Electron-microscopically, six granule types in the peripheral part of the lateral heart(More)
A proctolin (PROC)-like peptide was studied immunohistochemically in the hypothalamus, lower brainstem and spinal cord of the rat using an antiserum against PROC conjugated to thyroglobulin. Neuronal cell bodies containing PROC-like immunoreactivity (PROC-LI) were observed in the dorsomedial, paraventricular and supraoptic nuclei of the hypothalamus and in(More)
Neurons with proctolin-like immunoreactivity were mapped in the terminal ganglion of Periplaneta americana. The effect of different fixation methods on the variability of immunostaining is described and discussed. The appearance of immunoreactive presynaptic terminals, described here for the first time in insects, points to a function of proctolin as(More)
We used the protein-A gold technique to demonstrate the presence of apolipoprotein-B in ultrathin sections of fetal rat liver tissue. It was possible to show for the first time that the electron-dense, osmiophilic particles with diameters of 20–20 nm located within the RER cisternae and Golgi complexes of fetal rat hepatocytes contain apolipoprotein-B(More)
The prothoracic glands of the last instar of Galleria mellonella undergo characteristic alterations of their cellular fine structure closely related to cellular activity. During progressive secretory activity of the gland cells there are extensive plasmalemmal infoldings and formation of a pronounced lacunar system. Mitochondria of the active cell phase are(More)
  • J F Ude
  • 1975
A non-electrogenic mechanism for Na absorption has been demonstrated in the in vitro short-circuited rat mid-jejunum. This mechanism exists in addition to the electrogenic Na absorption associated with active non-electrolyte transfer. It was not possible to demonstrate the existence of a similar mechanism in rat terminal ileum and it is suggested that this(More)
The influence of puromycin on the neurosecretory Q and P cells of the brain of Enchytraeus was studied. The first effects were noticeable in nucleoli and ribosomes as early as 15 min after the administration of the antibiotic. At later stages of puromycin treatment swelling of mitochondria and disintegration of their internal structure, as well as changes(More)
The cytophysiology of two types of neurosecretory cells (Q and P cell) in the brain of the oligochete Enchytraeus was studied at the ultrastructural level. These cell types can be identified by their location, and particularly by the size difference of their elementary granules. Amputation of the last ten segments caused a release of secretory product(More)