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PubMed1983

[Spatial distribution of thiamine pyrophosphatase and arylsulfatase activities in the area of the Golgi apparatus of the adenohypophyseal secretory cells in the white rat].

Specimens of albino rat pituitary glands were processed consecutively for demonstration of thiamine pyrophosphatase (TPPase) and aryl sulfatase (ArSase) activities. To differentiate between the structures associated with each particular enzyme studied within a single cell, either somatotroph or mammotroph, ultrathin sections were exposed for 2 minutes to 2--50% H2SO4 which removed the reaction products for TPPase rather than those for ArSase. The comparative study of pairs of micrographs of the same area taken before and after the etching with H2SO4 has shown TPPase and ArSase to reside in the Golgi apparatus and GERL system, respectively. Transitional elements have also been discovered, thus supporting the idea that GERL may be a derivative of the Golgi apparatus.

Animals↗
PubMed1983

[Changes in the spatial distribution of the neuronal activity in the visual cortex after stimulation with flashes of diffuse light].

At different stages of development of the response to flash, grouping of excited neurons of the guinea pig 17th area occurs within the same cortical microzones separated by narrow inhibition zones common to the neighbouring excited ones. The ensembles of excited neurons have the form of columns narrowing into depth. The grouping of cells into a silent gap indicates the grouping of inhibiting neurons. Three subgroups are differentiated by the character of averaged dynamics of impulse activity in ensembles, the essential moment of their interrelationship being the reciprocity. The one subgroup in deep layers is characterized by stability of the focus at different stages of the response development and seems to express the grouping of corticofugal neurons. The ensembles are considered to be one of the forms of activity of the structured morphofunctional cortical units, i.e. the columns.

Animals↗