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Results for “Karyometry”

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At least 433 records · Page 24Linked to original sources
PubMed1989

Pineal activity during the seasonal gonadal cycle in a wild avian species, the tree pie (Dendrocitta vagabunda).

The aim of the present investigation was to study the pineal activity during the seasonal gonadal cycle in both sexes of the Indian tree pie (Dendrocitta vagabunda). The findings revealed that the nuclear diameter of the pineal parenchymal cells moderately decreased and was followed by a moderate increase in the cell population density (per microscopic field of the pineal sections) and serotonin content of the gland during the progressive phase. The values of these parameters were further altered (decreased nuclear diameter with increased cell population density and serotonin level) during breeding but were reversibly altered to some extent during the regression phase, and further altered during the nonbreeding phase in both sexes of the birds. It is suggested that the pineal activity distinctly varies with the seasonal gonadal cycle, being minimum during breeding and maximum during nonbreeding in both sexes of the tree pie.

Animals↗
PubMed1975

Some stereological correction formulae with particular applications in quantitative neurohistology.

The present report furnishes explicit formulations for correcting the observed nucleolar and nuclear volume fractions of neurons sampled on the basis of the presence of nucleolar profiles when sectioned. Such samples, frequently chosen for quantitative studies in neurohistology, can result in the overestimation ov component volume fractions. The correction formulae are derived by considering theoretical spherical models exhibiting "nucleus-nucleolus" concentricity and eccentricity, and are tested by applying them to analogous neuron populations in rat spinal cord. It is concluded that, with certain reservations, the formulae can be usefully applied to data obtained from nucleolar-biased samples, thereby increasing the reliability of quantitative information gleaned from such samples.

Cell Nucleolus↗