Theory of magnetoelastic resonance in a mono-axial chiral helimagnet

We study magnetoelastic resonance phenomena in a mono-axial chiral helimagnet belonging to hexagonal crystal class. By computing the spectrum of coupled elastic wave and spin wave, it is demonstrated how hybridization occurs depending on their chirality. Specific features of the magnetoelastic resonance are discussed for the conical phase and the soliton lattice phase stabilized in the mono-axial chiral helimagnet. The former phase exhibits appreciable non-reciprocity of the spectrum, the latter is characterized by a multi-resonance behavior. We propose that the non-reciprocal spin wave around the forced-ferromagnetic state has potential capability to convert the linearly polarized elastic wave to circularly polarized one with the chirality opposite to the spin wave chirality.Comment: 12 pages, 5 figures, Accepted in Phys. Rev.

GaAs(111)A and B in hydrazine sulfide solutions : extreme polarity dependence of surface adsorption processes

Chemical bonds formed by hydrazine-sulfide treatment of GaAs(111) were studied by synchrotron photoemission spectroscopy. At the B surface, the top arsenic atoms are replaced by nitrogen atoms, while GaAs(111)A is covered by sulfur, also bonded to underlying gallium, despite the sulfide molar concentration being 103 times smaller than that of the hydrazine. This extreme dependence on surface polarity is explained by competitive adsorption processes of HS- and OH- anions and of hydrazine molecules, on Ga- adsorption sites, which have distinct configurations on the A and B surfaces

Yield and content of biologically active substances in blue honeysuckle fruit (Lonicera caerulea L.) grown in the Forest Steppe of Ukraine

Received: July 28th, 2022 ; Accepted: September 26th, 2022 ; Published: October 20th, 2022 ; Correspondence: [email protected] blue honeysuckle (Lonicera caerulea L.) is a relatively new crop in Ukraine, its industrial cultivation is only 100 hectares. The main constraints are the lack of varieties with high yield and nutritional value of berries. Therefore, a study of the yield and quality of introduced varieties is necessary and relevant, both for producers and breeders. With our research, we determined the potential of the early stage of blue honeysuckle berries under the conditions of their cultivation in the Forest Steppe of Ukraine and the weather conditions of the year of the specified region. We assessed how early we can get a crop and set what quality and what it will be. To clearly understand the quality of the grown fruits, their average weight, size and uniformity were studied. From nutritional indicators of fruit quality, the content of dry matter, soluble solids, sugars and titrated acids was studied, from biologically active substances, the content of vitamin C and total phenolic was determined. It was found that in the zone of the Forest Steppe of Ukraine from the studied group of varieties, the highest yield potential, 3.13 kg from a bush for the second year of fruiting and fruit mass 2.4 g, had a variety of Canadian breeding ‘Boreal Beauty’. The fruits of the cultivars ‘Duet’ (4.3) and ‘Boreal Blizzard’ (4.5) were distinguished by the balance of taste according to the sugar-acid index, and the maximum amount of total phenolics for the studied group of varieties was accumulated by the fruits of ‘Boreal Beast’ (1,000 mg 100 g-1 )

Periodization of the naturalization process of kilka (Clupeonella cultriventris) in Dneprodzerzhinsk and Kremenchug reservoirs

В двух водохранилищах Днепровского каскада выявлены периоды прохождения фаз натурализации массового вида рыб, что важно для изучения данного процесса у различных видов в разных регионах и для понимания роли чужеродных видов в их рыбном населении. Натурализация тюльки в рядом расположенных водоемах протекала по-разному. В акватории будущего Днепродзержинского водохранилища этот вид проник за два года до строительства плотины, а в Кременчугское он вселился через четыре года после его создания. Детализация начала фаз натурализации основана на анализе динамических фазовых портретов уловов тюльки исследовательским траломВ двух водохранилищах Днепровского каскада выявлены периоды прохождения фаз натурализации массового вида рыб, что важно для изучения данного процесса у различных видов в разных регионах и для понимания роли чужеродных видов в их рыбном населении. Натурализация тюльки в рядом расположенных водоемах протекала по-разному. В акватории будущего Днепродзержинского водохра- нилища этот вид проник за два года до строительства плотины, а в Кременчугское он вселился через четыре года после его создания. Детализация начала фаз натурализации основана на анализе динамических фазовых портретов уловов тюльки исследовательским тралом.Any species in new life conditions passes through several phases or stages of naturalization. Information about time of these phases is important for analysis of changes in invader population and understanding of the role of alien species in analysed water bodies. The aim of this work is to detect the time of occurrence of naturalization phases for the kilka in the Dniprodzerzhinsk and Kremenchug reservoirs. The analysed material includes the own data, archives of the Institute of Fisheries of the NAAS, commercial fishery statistics and literature sources. A dynamic phase portrait method was applied for detailing the time of beginning of different phases. It was established that kilka had been already present in the Dniprodzerzhinsk reservoir at the phase of II (reproduction) before its construction, and after 1967 it became the predominant pelagic species. As for the Kremenchug reservoir, kilka invaded that water body 4–5 years after its construction. It quickly passed phases I and II and by 1968 became abundant commercial species. Thus, it was found that kilka’s naturalization phases occurred differently in these nearby water bodies: in the future Dniprodzerzhinsk reservoir area, this species penetrated two years before impoundment; while in the Kremenchug reservoir it penetrated four years after the construction. Four to five years were needed for passing first three phases of kilka naturalization in the studied reservoirs. Faster progression of the phases I and II of its naturalization in the Kremenchug reservoir compared to the Dniprodzerzhinsk one indicates on better life conditions in the first water body at the moment of invasion. Currently, the studied kilka populations pass the phase IV of naturalization, which is characterized by fluctuation of population abundance

THE CONTENT OF POLYUNSATURATED FATTY ACIDS (PUFAS) IN MEMBRANES OF ERYTHROCYTES IN CHILDREN WITH ATOPIC DERMATITIS (AD) OF VARYING SEVERITY

Currently, there is a hypothesis about the presence of congenital metabolic disorders of polyunsaturated fatty acids (PUFAs), which plays a role in the pathogenesis of atopic dermatitis. It is postulated deficit of deltafunction 6-desaturase, which leads to a lack of content in the cell membranes of derivatives of linoleic acid (gamma-linolenic acid (GLA) and arachidonic acid digomolinolenovoy). In addition, it is suggested a deficit of ω3-PUFA in atopic diseases. The composition of fatty acids of red blood cells in children with AD. Obtained by reduction of 14:0, 16:1 ω7, 18:1ω9 and 18:3ω6 (GLA) acids in erythrocyte membranes in children. The relationship between the level of GLA to the severity of AD. The complete absence of HCA in the membranes was detected in 83 % of children with severe AD, 60 % with mild AD and 41 % of healthy children, p1-3 = 0,033 It is suggested that the decrease in GLA in cell membranes may be the target of therapeutic intervention in children with AD. At the same time, our study found no evidence of ω3-PUFA deficiency in children with AD

Бесконтактный температурный метод влияния поля при магнитотерапии

Запропоновано безконтактний температурний метод контролю впливу магнітного поля на біологічний об’єкт, який полягає в дистанційній реєстрації, візуалізації та аналізі теплових полів біологічних об’єктів в зоні дії індукторів на основі їх інфрачервоного випромінювання, та спосіб контролю впливу на організм магнітним полем, оснований на вимірюванні температури до, під час та по закінченню терапевтичної процедури. Проведене математичне моделювання впливу магнітного поля на зміну температури поверхневих шарів епідермісу та експериментальне дослідження зміни температури на індукторах магнітотерапевтичних апаратів «МАГ-30-4», «МИТ-11» та «ПОЛЮС-4» при їх контакті та без контакту з біологічним об’єктом.Are offered a contactless temperature quality monitoring of influence magnetic field on biological objects which consists in distant registration, visualisation that the analysis of thermal fields biological objects in the zone of action inductors on the basis of their caloric radiation, and a way of influence on an organism a magnetic field which based that the temperature to, in a time and on the termination of therapeutic procedure is measured. Mathematical modelling of influence of a magnetic field on change of temperature of superficial spheres epidermis and an experimental research of change of temperature on inductors magnetictherapy apparatuses «MAG-30-4», «MIT-11» and «POLUS-4» is spent at their contact and without contact to biological installation.Предложены бесконтактный температурный метод контроля влияния поля при магнитотерапии, который состоит в дистанционной регистрации, визуализации и анализе тепловых полей биологических объектов в зоне индукторов на основе их инфракрасного излучения, и способ контроля влияния на организм магнитным полем, основанный на измерении температуры до, во время и по окончанию терапевтической процедуры. Проведено математическое моделирование влияния магнитного поля на изменение температуры поверхностных шаров эпидермиса и экспериментальное исследование изменения температуры на индукторах магнитотерапевтических аппаратов «МАГ-30-4», «МИТ-11» и «ПОЛЮС-4» при их контакте и без контакта с биологическим объектом

Prevalence of the polymorphic H-ficolin (FCN3) genes and mannosebinding lectin-associated serine protease-2 (MASP2) in indigenous populations from the Russian Arctic regions

Lectins, being the main proteins of the lectin pathway activating the complement system, are encoded by polymorphic genes, wherein point mutations cause the protein conformation and expression to change, which turns out to have an effect on the functionality and ability to respond to the pathogen. In the current study, largescale data on the population genotype distribution of the genes for H-ficolin FCN3 rs28357092 and mannose-binding lectin-associated serine protease MASP2 rs72550870 among the indigenous peoples of the Russian Arctic regions (Nenets, Dolgans and Nganasans, a mixed population and Russians: a total sample was about 1000 newborns) have been obtained for the first time. Genotyping was carried out using RT-PCR. The frequency of the homozygous variant del/del FCN3 rs28357092 associated with the total absence of the most powerful activator of the lectin complement pathway, N-ficolin, was revealed; 0 % in the Nenets, 0.8 % in the Dolgans and Nganasans, and 3.5 % among the Russians ( p < 0.01). Analysis of the prevalence of the MASP2 genotypes has shown the predominance of the homozygous variant AA in all studied populations, which agrees with the available world data. The heterozygous genotype AG rs72550870 associated with a reduced level of protease was found to occur rarely in the Nenets, Dolgans and Nganasans compared to newborns of Caucasoid origin from Krasnoyarsk: 0.5 % versus 3.3 %, respectively. Moreover, among 323 examined Nenets, one AG carrier was identified, whereas in Russians, 16 out of 242 examined newborns were found to be AG carriers ( p < 0.001). A homozygous variant (GG) in total absence of protease with impaired binding of both MBL and ficolins was not detected in any of the 980 examined newborns. An additional analysis of infectious morbidity in Arctic populations allows one to find phenotypic characteristics related to a high functional activity of the lectin pathway of complement activation as an most important factor for the first-line of anti-infectious defense, including such new viral diseases as COVID-19

ШЕЙНАЯ ЛИМФАДЕНОПАТИЯ ИНФЕКЦИОННОЙ ЭТИОЛОГИИ У ДЕТЕЙ: ВОПРОСЫ ДИФФЕРЕНЦИАЛЬНОЙ ДИАГНОСТИКИ

Cervical lymphadenopathy is a very frequent diagnosis in pediatric practice. Most of the cases of lymph nodes enlargement in children are not associated with severe, life-threatening diseases. However, in some patients lymphadenopathy is an easily accessible indicator for early diagnosis of a serious illness. Early detection of such indicators can often save a child’s health and even life. This article details the main infectious causes of cervical lymphadenopathy in children. The algorithm of the diagnostic is presented.Шейная лимфаденопатия является очень частой диагностической находкой в практике педиатра. Большинство случаев увеличения лимфоузлов у детей не сопряжены с серьезными, угрожающими жизни заболеваниями. Однако у некоторой части пациентов лимфаденопатия является легко доступным для ранней диагностики признаком серьезного заболевания, своевременное выявление которого зачастую может сохранить ребенку здоровье и даже жизнь. В настоящей публикации детально рассмотрены основные инфекционные причины шейной лимфаденопатии у детей, представлен диагностический алгоритм