Mixed vs Stable Anti-Yetter-Drinfeld Contramodules

We examine the cyclic homology of the monoidal category of modules over a finite dimensional Hopf algebra, motivated by the need to demonstrate that there is a difference between the recently introduced mixed anti-Yetter-Drinfeld contramodules and the usual stable anti-Yetter-Drinfeld contramodules. Namely, we show that Sweedler's Hopf algebra provides an example where mixed complexes in the category of stable anti-Yetter-Drinfeld contramodules (previously studied) are not equivalent, as differential graded categories to the category of mixed anti-Yetter-Drinfeld contramodules (recently introduced).

The affinity of copper(ii) ions towards l-amino acids in the solid-state: a simple route towards mixed complexes

Competitive milling was successfully employed to determine the relative affinity of Cu(ii) ions towards selected l-amino acids (Asn, Gln, His, Phe, Pro, and Trp). Described process opens a simple route towards mixed coordination compounds.

The pottery of the final phase of sperrings culture

The paper is devoted to the poorly studied final period of the existence of Early Neolithic Sperrings culture. There are few settlements of this period - Voynavolok XX, Sandermoha II, Pindushi and Sulgu Va, they are presented in mixed complexes with proscenium stone tools and the absence of radiocarbon dates. No transitional complexes between the developed and final stages of the sperrings culture have been identified. The ceramics of the final stage has a number of differences from the classic sperrings. This lack of ornamentation imprints fish vertebra and the retreating lines. At the same time there are imprints of the corded stamps and oval (rhomboid) pits, round-conical pits marked on the main pattern - characteristic features of the advanced stage of the sperrings culture. The main ornament is horizontal zones inclined right and left with a short-cut or corded stamps, comb stamp or oval (rhomboid) pits that form a vertical zigzag lines coated on top of horizontal belts of round-conical pits, sometimes arranged in a staggered manner. Such a change of pottery decoration hasnt been noted by experts studying early Neolithic ceramics of Karelia due to a small number of vessels and their presence in mixed complexes. Therefore, the development of the sperrings culture is likely to have been continued in some areas of South Karelia, but it is poorly recorded due to the refusal of the ancient population to use a fish vertebra as ornamentation as well as the transition to comb stamps.