Hybrid bulk and planar heterojunctions with electroluminescent quantum dots CdZnSeS and poly(dioctylfluorene)

Hybrid organic-quantum dot light emitting devices (QD-OLED) with bulk and planar heterojunctions based on poly(dioctylfluorene) and electroluminescent quantum dots CdZnSeS (QD) were obtained. The influence of QD concentration and the QD film morphology on the device electroluminescence was investigated. For QD-OLED with QD emissive bilayer, the device electroluminescent efficiency was higher compared to bulk heterojunction

Current trends in logistics and logistics outsourcing in the context of Covid-19

У статті розглянуто ключові фактори, що впливають на розвиток логістики в умовах пандемії. Також було проаналізовано тенденції сучасної логістики, які прямо підкреслюють важливість розуміння внутрішніх бізнес-процесів підприємства та зовнішнього середовища.The article considers the key factors influencing the development of logistics in a pandemic. Trends in modern logistics were also analyzed, which directly emphasize the importance of understanding the internal business processes of the enterprise and the external environment

Studies on Peridinium aciculiferum and Peridinium malmogiense (=Scrippsiella hangoei): comparison with Chimonodinium lomnickii and description of Apocalathium gen. nov. (Dinophyceae)

The fine structure of the freshwater Peridinium aciculiferum and the closely related Baltic Sea species currently known as Scrippsiella hangoei were examined in serial sections. The species name Peridinium malmogiense is shown to be an earlier synonym of Scrippsiella hangoei and is restored as the name of the species. Although both species have been included in the genus Peridinium, their phylogenetic positions are within the Thoracosphaeraceae, close to the specialized predators known as the pfiesteriaceans and the photosynthetic freshwater Chimonodinium lomnickii. The fine-structural features of the two species proved to be very similar, including the details of flagellar bases and roots, and the type of pyrenoid, which consisted of dilated areas of the chloroplast crossed by two-thylakoid lamellae and not associated with starch sheaths. Comparison with Chimonodinium revealed significant differences, in particular the absence of an eyespot and any trace of microtubules associated with a peduncle, which contrast with the multilayered eyespot and the distinct microtubular basket (MB) of C. lomnickii. The absence of a MB in P. aciculiferum and P. malmogiense is regarded as a character loss within a group of species hypothesized to be derived from a MB-containing ancestor. A phylogenetic analysis based on concatenation of nuclear-encoded small subunit rDNA, internal transcribed spacers 1 and 2 including 5.8S sequences agreed with published phylogenies based on genes of the ribosomal operon in closely grouping P. aciculiferum, P. malmogiense and two other species of peridinioids with a similar amphiesmal plate arrangement: P. euryceps and P. baicalense. The four species are regarded as members of the same genus. While one of the closest known relatives of these four species is C. lomnickii, the variable association of this species to several other groups of species in published phylogenies and the differences in fine-structure revealed in the present work advise against transferring the studied species to Chimonodinium. The new genus Apocalathium is described with P. aciculiferum as type species

On the identity of the freshwater dinoflagellate Glenodinium edax, with a discussion on the genera Tyrannodinium and Katodinium, and the description of Opisthoaulax gen. nov.

Within the context of the preparation of a flora for the identification of freshwater dinoflagellates, the identity of Glenodinium edax and the affinities of a group of phagotrophic species with a conspicuous eyespot not associated with plastids (eyespot type C) currently classified in Katodinium were re-evaluated. The original description and illustrations of the phagotrophic G. edax suggest affinity with the Pfiesteriaceae. Whereas the tabulation currently associated with G. edax is based on a probable misidentification, the similarity to Tyrannodinium berolinense suggests that the two names can be regarded as synonyms and T. edax comb. nov. is proposed. As presented in modern floras, Katodinium is artificially defined on the basis of the position of the cingulum at or below the posterior third of the cell, and includes widely different forms. The presence of an eyespot of type C in the phagotrophic Katodinium vorticella and related species combines with a general cell morphology reminiscent of Esoptrodinium gemma and the formation of Tovellia-like cysts to mark this group of species as belonging to the Tovelliaceae. The type species of Katodinium, K. nieuportense, is morphologically quite different from these species and does not display tovelliacean characters. None of the known genera of Tovelliaceae matches the characters of K. vorticella and its close relatives. Opisthoaulax gen. nov. is described and new combinations are proposed for K. vorticella and six other species