Experimental study on the degradation of sandstone-petroglyph carriers in Helankou: Effects of freeze-thaw and wet-dry cycles.

The Helankou petroglyphs offer precious data for understanding the lifeways of ancient pastoralists. However, in Helankou, the combination of unique climate conditions and complex hydrochemical environments has accelerated the weathering of the sandstone-petroglyph carriers, leading to numerous petroglyphs at risk of vanishing. In response, this study employed freeze-thaw and wet-dry cycle experiments to simulate the actual environmental conditions for sandstone.

Increased Functional Connectivity Between Medulla and Inferior Parietal Cortex in Medication-Free Major Depressive Disorder.

Emerging evidence has documented the abnormalities of primary brain functions in major depressive disorder (MDD). The brainstem has shown to play an important role in regulating basic functions of the human brain, but little is known about its role in MDD, especially the roles of its subregions. To uncover this, the present study adopted resting-state functional magnetic resonance imaging with fine-grained brainstem atlas in 23 medication-free MDD patients and 34 matched healthy controls (HC).