• The Korean Journal of Zoology
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• v.38 no.3
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• pp.388-394
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• 1995

We investigated ultrastuctural change of small intestinal mucosal epithelial cell, columnar cell and mucous cell, of hibernating ground squirrel during activating and hibernating stages. In active columnar cells, many mitochondria and rough endoplasmic reticulum were observed. In hibernating columnar cells, more free nhosome than rough endoplasmic reticulum were observed. In active mucous cells, large and many mucosal granules, mitochondria and rough endoplasmic reticulum were observed. Mucosal granules have been secreted excellently. In hibernating mucous cells, small and little mucosal granules and many free ribosome were observed.

• Journal of the Korean earth science society
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• v.35 no.4
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• pp.290-294
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• 2014

In this study, we investigated the characteristics of rodent (mainly ground squirrel) burrows found near the Lake Hovsgol, Mongolia. Those burrows are straight to slightly curved and gently inclined in lateral view. Cross-sectional shapes are either circular or elliptical with diameters ranging from mostly 8-10 cm. Most abandoned burrows are passively filled with soils and/or pebbles. The size and architecture of these Mongolian burrows are remarkably similar to those of the previously reported Late Pleistocene burrows from Korea. Therefore, the rodent burrows found at Korean Palaeolithic sites are thought to have been formed by ground squirrels. However, the difference in burrow-fills suggests that the mean annual precipitation of the Korean Peninsula during the Late Pleistocene is much higher than that of Mongolia.