Peculiar salivary glands in a silk‐producing mite Bakericheyla chanayi (Cheyletidae)

This is the first ultrastructural investigation of salivary glands in the family Cheyletidae. In both sexes of Bakericheyla chanayi, paired acinous salivary glands and tubular coxal glands were shown to be united into the common podocephalic system. The secretory portion of the salivary gland includes medial and lateral lobes composed of the five and two cells, respectively, with clearly distinct ultrastructure. The cytoplasm of the cells is occupied by the secretory granules containing fine fibrous material. The fine structure of both cell types suggest a proteinaceous nature of their secretions. A single central process extending from the apical face of each secretory cell passes through the common acinar cavity to enter the conducting duct. A pair of intercalary cells at the base of the conducting duct links it with the secretory portion of the gland. Extending towards the acinar cavity, protrusions of intercalary cells alternate the apical regions of the secretory cells and form with them highly‐specialized contacts characterized by the apical network of microtubules and microfilaments. Two possible ways of secretion are suggested: 1) exocytosis into the acinar cavity and 2) direct passage via the central processes. The detection of axon profiles in the gland body suggests a neural control for the glandular cell function. In tritonymphs, neither secretion nor large lateral lobe cells were observed up to the pharate stage when the lateral lobe undergoes rapid differentiation. The arrangement of the acinous gland is compared to that of other arthropods. Its composition appears to be close to the class three of insect glands. The involvement of the lateral lobe cells in silk production is discussed. J. Morphol. 276:772–786, 2015. © 2015 Wiley Periodicals, Inc.     

Patterns of Synergic Interaction Display after Heavy Metals Combined with Hyperthermia or Ionizing Radiation

Biology Bulletin - Abstract—The objective of this study was to identify the general patterns of synergism display after the simultaneous action of heavy metal salts with ionizing radiation or...     

Status of cell surface of hepatocytes after exposure to carbon tetrachloride

In order to estimate contact interactions and deformity of the surface of hepatocytes at a toxic hepatitis, produced by means of carbon tetrachloride, a morphometric analysis of ultrastructures of the contacts and retractions of the surface of hepatocytes, formed at an increased intraorganic pressure has been performed. Carbon tetrachloride produces decrease in adhesive interactions of the cellular surfaces in the area of simple connections, decrease in amount of desmosomes and results in increasing deformity of the surface of hepatocytes. These data support that there exists a universal reaction of the intercellular contacts to a damaging action.