["Sarconeural" neuromuscular junctions. Structural features, distribution and possible functional role].
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Animals↗
Biomedical subjects
D V Guliaev
Publications and source records attributed to D V Guliaev.
[2 types of neuromuscular junction in the pharyngeal retractor muscle of snails].
The pharyngeal retractor muscle of Helix lucorum is innervated by two symmetrical nerves which contain axons of two types forming myoneural junctions with the muscle cells. Type I junctions correspond to thick axons. These axon terminals which contain a large number of spherical, clear vesicles (41 +/- 5 nm) and a smaller number of dense-cored vesicles (67 +/- 3 nm) make contacts mainly with noncontractile sarcoplasmic processes of muscle cells. Type II junctions correspond to thin axons containing many of granules. Their axon terminals contact with contractile parts of muscle cells and contain a heterogenous population of vesicles: small spherical clear vesicles (44 +/- 2 nm), dense-cored vesicles and numerous irregularly outlined granules with fine-granular content (135 +/- 5 nm). Space between muscle cell is usually wide (50 nm and more) with the exception of sarcoplasmic processes where the gap may be less than 10 nm.
Animals↗
[A new allele variant of ssa and its participation in regulating the proliferation of the stem elements of the leg and antenna imaginal disks in Drosophila melanogaster].
Using a highly mutable FM/w oc system, we have established a new allele of ssa40aSc mutation whose phenotype is identical to ssa40aNs compound described in the literature. The following features are characteristic of the ssa40aSc flies phenotype: (1) the increased number of sex comb teeth, (2) complete fusion of tarsal segments, and (3) the decreased bristle size corresponding to that of ss flies. The first two features are evidence for the impaired stem cell proliferation in the antennal and leg imaginal discs which are determined to form distal structures. This assumption was experimentally confirmed when we transplanted leg imaginal discs from III instar larvae of different age into prepupae. The observed phenomenon is probably due to the defects of the Antp and Pc translation products binding site in the ss locus.
Alleles↗