Macedonian Academy of Sciences and Arts

Ice-ray pentagonal packing of pseudo-fivefold helices

While fivefold point symmetry is common in nature, fivefold spatial symmetry is seldom observed. Regular pentagons cannot tile a plane without leaving voids, and even the densest “ice-ray” packing is exceptionally rare. Fivefold helices are equally elusive. We report a small mole...

How Norms Depend on the Presence and Status of Observers: The Relational Contingency of Everyday Behaviors in 90 Societies

Norms are fundamental to social life, but basic questions about how they are affected by social context remain. Specifically, how do normative constraints depend on the presence and status of observers, and how do such relational contingencies vary across cultures? Using data fro...

Dysregulated adult hippocampal neurogenesis in major depressive disorders

Major depressive disorder (MDD) is associated with reduced hippocampal volume, altered connectivity and negative memory bias, suggesting disrupted hippocampal plasticity. Dysregulated adult hippocampal neurogenesis is a potential contributor, but its relevance in humans and role...

Trace element accumulation in bryophytes from Allchar (North Macedonia): contamination or genuine hyperaccumulation?

Abstract Main conclusion Genuine accumulation of metals/metalloids in bryophytes is limited and highly susceptible to surficial contamination with soil particles. Washing with an apolar solvent removes most surficial contamination prior to elemental analysis. Abstract Bryophytes...