Optical "fingerprints" of dielectric resonators

The complete picture of the optical properties of resonant structures, along with the frequency, quality factor, and line shape in the scattering spectra, is determined by the electromagnetic field distribution patterns, which are a kind of "fingerprint" of each resonant eigenmode. In this paper, we simultaneously analyze the changes in the spectra and the transformation of the field pattern during the topological transitions from a thin disk to a ring with a gradually increasing thickness and further to a split ring. In addition, we demonstrate characteristic optical fingerprints for well-known interference effects such as bound states in the continuum and Fano resonances.Comment: 11 pages, 5 figure

Possibilities of using branched-chain amino acids for the treatment and prevention of sarcopenia in elderly and old patients (literature review)

Due to the high prevalence of sarcopenia among elderly and old patients, early prevention and treatment of sarcopenia and its complications are relevant. Protein supplements can be used to maintain muscle strength and mass during aging. The possibility of using branched-chain amino acids (BCAAs) in the treatment and prevention of sarcopenia in geriatric patients is of scientific interest. BCAAs promote the synthesis and inhibit the degradation of muscle tissue proteins, are involved in the regulation of tissue sensitivity to insulin, ammonia utilization, the tricarboxylic acid cycle, etc.Search strategy. The search for scientific articles for literature review was carried out in the PubMed and PubMed Central databases. The selection criterion was scientific articles published up to December 2022. We used the following search keywords: “branched-chain amino acids”, “BCAA”, “body composition”, “sarcopenia”, “aging”. The 2019 European Working Group on Sarcopenia in Older People 2 (EWGSOP2) Consensus was included in the list of articles.Conclusions. The possibility of using BCAAs in elderly and old patients for the prevention and treatment of sarcopenia is a relevant topic that continues to be actively studied. The effectiveness of BCAA supplementation in the diet is debatable as long as sufficient protein is consumed daily. On the other hand, BCAA supplementation may be justified in cases where it is not possible to consume enough high-quality protein in the diet. More research is needed on this topic

EFFECT OF HEAT TREATMENT ON THE STRUCTURE AND COEFFICIENT OF THERMAL EMF OF FILMS

The electrical properties of thin films (In2O3/SiO2)25 and their stability under high-tem-perature treatment are investigated. The value of the thermal emf coefficient after a series of annealing is stabilized and corresponds to the values for the electrodes of chromel-alumel thermocouples.Работа выполнена при поддержке Министерства науки и высшего образования РФ в рамках государственного задания (проект №FZGM-2020-0007)

OPTICAL PROPERTIES OF (In2O3/SiO2)25 MULTILAYER STRUCTURES

(In2O3/SiO2)25 multilayer structures were obtained by ion-beam sputtering. The structure of (In2O3/SiO2)25 thin films are amorphous. Multilayer structures have high transparency and low electrical resistance, which makes them a promising material for transparent electronics.Работа была выполнена при поддержке государственного задания (№ FZGM-2020-0007)

THERMOEMF OF THIN-FILM STRUCTURES In2O3/SiO2

Thin films (In2O3/SiO2)25 were by ion-beam sputtering. The effect of heat treatment on the phase composition and thermopower is studied. Increasing of annealing temperature – a thermopower was decrease. After annealing, the structure of thin films is preserved up to a temperature of 500°C.Данная работа выполнена при поддержке РФФИ (Грант №19-48-360010 р_а)

Cryptochrome 1a localisation in light- and dark-adapted retinae of several migratory and non-migratory bird species: no signs of light-dependent activation.

The magnetic compass of birds seems to be based on light-dependent radical-pair processes in the eyes. Cryptochromes are currently the only candidate proteins known in vertebrates that may serve as the primary radical-pair-based magnetoreceptor molecules. Previous immunohistochemical studies have suggested that cryptochrome 1a (Cry1a) is localised in the photoreceptor outer segments of the ultraviolet/violet (UV/V) cones, and it has been claimed that differences in Cry1a antibody staining intensities show that Cry1a is activated by light and that this should make Cry1a the most likely magnetoreceptive candidate molecule. Here, we present an independent study of Cry1a distribution within retinae of several bird species, ranging from non-migratory domestic chicken and rock pigeon to night-migratory passerines, using both the previously used antibody and two newly generated antibodies, one against the same epitope as the originally used antibody and one against a different epitope of Cry1a. We confirm the UV/V cone outer segment localisation of Cry1a in all the tested bird species. In some stainings, we found Cry1a immunoreactivity as a distinct punctate pattern throughout the whole length of the UV/V cone outer segments. These dots with a diameter of around 170 nm might suggest that many Cry1a molecules accumulate in distinct spots in the UV/V cone outer segments. However, we did not see any notable difference in Cry1a immunoreactivity between light- and dark-adapted retinae. We find no evidence whatsoever that a C-terminal antibody against Cry1a labels only a light-activated form of the Cry1a protein