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Data on reproduction of the earwig Forficula vicaria Semenov (Dermaptera, Forficulidae) in Primorskii Territory of Russia are presented. The total period of reproductive activity lasts from 47 to 52 days. The earliest mating couples were recorded at the beginning of the last third of August, and the latest ones, in mid-October. The time spent by the male and female in the cage before mating was 28 days for the couple formed in late July, 17 days for that formed in early August, 5 days for that formed in mid-August, and less than a day for that formed in late August. The couples mated repeatedly 11–17 times over the entire period of observation. From 1 to 3 copulations were recorded daily, each lasting from 30 min to 10 h with intervals varying from 20 min to 9 h. Active feeding was observed for 1.5–4 h after mating. Females started laying eggs in late September; their fecundity ranged from 52 to 71 eggs per female, and from 4 to 33 eggs were laid daily between copulations. Mature eggs were present in the ovaries of dissected females until mid-October. Forficula vicaria is characterized by parental care; starting with mid-September, the adults make wintering shelters in which they hibernate protecting their eggs.

Ulmus laciniata is a strategic food resource for Cervus elaphus xanthopygus , especially in autumn and spring. The results of a study of the seasonal content of water-soluble polysaccharides, their monosaccharide composition, extracted from the bark and bast of U. laciniata, are presented. Two maxima in the content of water-soluble polysaccharides were revealed: during the shoot growth period (June) and during a slightly lower one during the preparation for winter dormancy (October). The minimum content is observed during the beginning of the growing season (April–May). The content of pectin substances, unlike water-soluble polysaccharides, changed slightly during the year. The groups of substances studied are classified as the most bioavailable polysaccharides with extensive physiological activity. In addition, the data obtained may explain the feeding behavior of C. elaphus xanthopygus , which lives in Primorskii krai.

The influence of nitrogen and boron dopants on the electronic and optical properties of carbon diamanes with the AA packing is studied. The conducted density functional theory calculations show that introducing high concentrations of impurity atoms (6.3% and 12.5% of the number of carbon atoms) into the diamane structure has almost no effect on the lattice constant but significantly changes the band gap: it increases by 0.97 eV upon the introduction of nitrogen atoms, decreases by 0.94 eV upon the introduction of boron atoms, and decreases by 0.82 eV upon the simultaneous introduction of both atoms. These structural and electronic properties suggest that boron- and nitrogen-doped diamanes can be used in the synthesis of lateral heterostructures for the production of nanoelectronic devices. The recorded Raman and IR spectra can be used to identify doped diamanes by means of characteristic vibrational modes of boron and nitrogen atoms inside the diamane crystal lattice.

Nymphal and adult Urostylis annulicornis Scott, 1874 were reared in cages from eggs overwintered under oak bark in the south of Primorskii Territory of Russia. The nymphs hatch before the onset of oak vegetation season and develop under the bark, consuming the jelly-like coating of the egg mass. As the oak leaves unfold, the II–III instar nymphs leave their shelters and begin feeding on leaf sap. Adults live in the oak crown. The sequence of molts of all the nymphal instars, their feeding, and the timing of seasonal development of the species in nature are described.

We studied the hydrogen adsorption on the surface of a covalently bonded bilayer borophene-graphene heterostructure decorated with Pt, Ni, Ag, and Cu atoms. Due to its structure, the borophene-graphene bilayer combines borophene activity with the mechanical stability of graphene. Based on the density functional theory calculations, we determined the energies and preferred adsorption sites of these metal atoms on the heterostructure’s borophene surface. Since boron atoms in different positions can have different reactivities with respect to metal atoms, we considered seven possible adsorption positions. According to our calculations, all three metals adsorb in the top position above the boron atom and demonstrate catalytic activity. Among the metals considered, copper had the best characteristics. Copper-decorated heterostructure possesses a feasible near-zero overpotential for hydrogen evolution reaction. However, the borophene-graphene bilayer decorated with copper is unstable with respect to compression. Small deformations lead to irreversible structural changes in the system. Thus, compression cannot be used as an effective mechanism for additional potential reduction.

Data on the status of two natural populations of the rare, endemic medicinal species Alangium platanifolium known from the Russian Federation is provided in this article. Information about one of them is reported for the first time. Geobotanical descriptions of the phytocenoses are presented. In southern Primorskii krai, A. platanifolium has been noted to grow in the shrub layer of coniferous/broad-leaved forest with Pinus koraiensis and Abies holophylla . It has also been found that the area of the population discovered 20 years ago has expanded tenfold and now amounts to 10 ha. The new locality of A. platanifolium covers an area of 0.25 ha. The total number of A. platanifolium is more than 700 of various-age plants. The data obtained extends the current knowledge of the distribution and life state of A. platanifolium and indicates the fact of the growth of subtropical elements in phytocenoses of the Russian Federation.

Data on the clown stink bug, Poecilocoris lewisi (Distant, 1883) (Heteroptera, Scutelleridae), from the southern Russian Far East are presented. Information on the northern localities of its distribution range is summarized, and a brief overview of its biology is given. The study is based on the collection material and the authors’ data for 1999–2024. A map of collection sites in Primorskii Territory is provided. Information on the local plant species that constitute the food supply for the bug— Fraxinus mandshurica Rupr., Syringa wolfii C.K. Schneid. (Oleaceae), Juglans mandshurica Maxim. (Juglandaceae), and Acer negundo L. (Sapindaceae)—has been collected. The documented feeding of P. lewisi on Alangium platanifolium (Siebold & Zucc.) Harms, a plant of the family Alangiaceae DC, is a new contribution to the knowledge of the species’ diet.

The effect of fluorination of boron nitride fullerene B 12 N 12 on its activity towards the favipiravir molecule (a drug against the COVID-19 virus) is studied by the density functional theory. Two types of fullerene fluorination are considered: external doping with the formation of the B 12 N 12 F 2 structure and endohedral doping with the formation of the F – @B 12 N 12 complex. It is shown that fluorinated clusters can attach favipiravir by the same mechanism as initial fullerene. It is found that the interaction between the drug and the endohedral complex is too weak, while external doping by fluorine increases the binding energy between the cluster and the drug.

The influence of exclusive prefission neutron spectra, [Formula omitted], on the observed spectra of prompt fission neutrons (PFN), the total kinetic energy (TKE) of fission fragments (products), and the average number of prompt fission neutrons is studied. The [Formula omitted] exclusive neutron spectra correspond to a self-consistent description of the fission reactions (neutron emission) [Formula omitted]U( [Formula omitted]) ( [Formula omitted]U( [Formula omitted])) and [Formula omitted]Pu( [Formula omitted]) ( [Formula omitted]Pu( [Formula omitted])) for neutrons of energy extending up to 20 MeV. An extensive experimental database of PFN spectra made it possible to study in detail (confirm) an intricate dependence of the shape of observed PFN spectra on the fissility of [Formula omitted]U and [Formula omitted]Pu compound nuclei. This effect is found to be correlated with the contributions of ( [Formula omitted]) emissive fission reactions and with the competition of ( [Formula omitted]) and ( [Formula omitted]) reactions. The exclusive prefission neutron spectra of [Formula omitted] reactions and the exclusive neutron spectra of ( [Formula omitted]) and [Formula omitted] reactions were calculated by means of the Hauser-Feshbach formalism simultaneously with the ( [Formula omitted]) and ( [Formula omitted]) cross sections. It is shown that the angular anisotropy of exclusive neutron spectra of ( [Formula omitted]) reactions has a substantial effect on the observed spectra of prompt fission neutrons and their average energies [Formula omitted]. The ratio of the average PFN energies [Formula omitted] for the forward and backward emission of prefission neutrons in the reactions [Formula omitted]U( [Formula omitted]) and [Formula omitted]Pu( [Formula omitted]) agrees with experimental data. Partial components associated with ( [Formula omitted]) and ( [Formula omitted]) reactions are singled out in the observed PFN spectra. The input values of model parameters are fixed in describing PFN spectra of thermal-neutron-induced fission reactions. The potential of the approach being considered for predictions of PFN spectra and their average energies [Formula omitted] in the reactions [Formula omitted]U( [Formula omitted]) and [Formula omitted]Pu( [Formula omitted]) is demonstrated.

The results of a consistent computational and experimental study of acoustic self-oscillations in an annular cavity surrounding a circular pipe with a local narrowing are given. In the experiment, pressure fluctuations were measured on the outer wall of the annular cavity for various volume flow rates; air entered the pipe at the atmospheric pressure. It was found that the flow regime with excitation of acoustic self-oscillations in the cavity is implemented in a certain range of flow rates. The oscillation frequency corresponds to the first natural frequency, and the root-mean-square values of pressure fluctuations reach a level of 2300 Pa. Numerical simulation based on the RANS approach, carried out for the geometry and conditions of experiment, reproduces the observed effect of acoustic excitation of the cavity and gives similar values of the fluctuation amplitude. The oscillation modes developed at various volumetric flow rates are analyzed based on the obtained calculated data.