Morphometric substantiation of a fixation method choice at surgical correction of spondylolisthesis

The purpose was to reveal patterns of morphometric characteristics variability of lumbar vertebrae and sacrum for a choice of more adequate selection of standard sizes and introduction orientation of corrigent metalware at surgical treatment of spondylolisthesis. Preparations of lumbar vertebrae and sacrum of 60 skeletons, 110 Kt-grams of men and women of the first and second periods of mature age without visible pathology of a backbone and 300 Kt-grams of patients with spondylolisthesis. The data on age variability and sexual dimorphism of lumbar vertebrae and sacrum were obtained. The analysis of results of surgical treatment of 288 patients with spondylolisthesis during 1995-2008 was carried out. 160 patients were managed with preoperative planning, taking into account morphometric characteristics of vertebrae and sacrum since 2003. It is necessary to install and arrange metalware at reduction taking into account features of back structures and forward basic complex of lumbar vertebrae and sacrum; that allows to receive adequate decompression of neurovascu-lar structures in 85-90% cases, reliable correction and stabilization of damaged lumbosacral segment

The integrative model of resiliency in higher education seekers in war conditions

The article presents the results of the study of “The Integrative Model of Resiliency” in higher education seekers in war conditions. 174 higher education seekers were examined, among them: 144 students of the 4th-6th year of the medical faculty and the faculty of medicine and pharmacy of the Dnipro State Medical University, majoring in 222 “Medicine” (main group) and 30 students of the 4th-5th year of the Ukrainian State University of Science and Technology (comparison group). The aim of the study was to determine the modalities of resiliency in higher education seekers in the war condition. A psychodiagnostic method with the integrative model of resiliency “BASIC Ph” was used in the research. The distribution of modalities, their degree of expression (scoring), gender features of the distribution of modalities and their correlations were studied. In the vast majority of higher education seekers, one modality of resiliency dominated (94% in the main group, 100% in the comparison group), which was cognitive modality (64% in the main group, 67% in the comparison group) as the most mature, adaptive and constructive way of overcoming the crisis, especially during the war. In 6% of the investigated ones in the main group, the dominance of two modalities was found, among which the cognitive strategy was once again the leading one (89%). Some gender features of the use of stress coping strategies were revealed. Thus, a statistically significant difference was observed between the indicators of the modalities “Belief”, “Emotions” and “Social support” among males and females of the main group and “Emotions” and “Imagination” in the comparison group (p<0.05). Analyzing the gender characteristics of the correlations of resiliency modalities, a more multifaceted model was found in medical students of male gender. The obtained data contribute to a deeper understanding of own personal strengths and the involvement of less developed ones by higher education seekers, aimed at strengthening and enriching their resources to overcome resiliency of war crisis. Thus, the results of the study should be taken into account when developing psychoeducational and psychocorrective measures and conducting psychological support for of higher education seekers in the conditions of war and post-war time

Comparative anatomical and morphological characteristics of two subspecies of Melissa officinalis L. (Lamiaceae)

Received: February 23rd, 2022 ; Accepted: May 22nd, 2022 ; Published: July 30th, 2022 ; Correspondence: [email protected] aim of the research is to comprehensively compare the anatomical and morphological structures of plants of Melissa officinalis subsp. officinalis (‘Krymchanka’ and ‘Lada’ varieties) and of M. officinalis subsp. аltissima (Sm.) Arcang. These plants have pronounced differences in morphological features and production indexes. They are grown in the collection of aromatic plants of the Research Institute of Agriculture of the Crimea (Krymskaya Roza village, Belogorsky district of Crimea). These studies will allow us to supplement the botanical characteristics of both subspecies of M. officinalis, and also to evaluate their plasticity and possibilities of adaptation to growing conditions. For examination we collected plants in the flowering phase. Anatomical study was carried out using a fixed (alcohol: glycerin : water in a ratio of 1: 1: 1) and native preparation. A complex of mesomorphic and xeromorphic characters is established, that confirms the high plasticity and determines the adaptive capabilities of the species when introduced into various soil and climatic conditions. A variety of epidermal structures was revealed, which are represented by single and multicellular non-glandular trichomes and various types of glandular structures. Among them, trichomes with a multicellular pedicle and a unicellular head, which we found only in M. officinalis subsp. officinalis

Nanocrystalline Ge films created by thermal vacuum deposition on GaAs substrates: structural and electric properties

The technique of thermal vacuum deposition of Ge onto GaAs substrates has been used for obtaining nanocrystalline Ge films. Nanocrystalline character of the films is confirmed by atomic force microscopy of their surface and by the data of Raman light scattering. The most probable size of the nanocrystallites forming the films decreases monotonically with decreasing their thickness. Electro conductivity of such the films proves to be high enough (1-10 Ohm·cm at room temperature) and has a character of variable range hopping conduction of Mott’s type. The hops, presumably, take place through the localized states connected with the grain boundaries

The growth of weakly coupled graphene sheets from silicon carbide powder

A simple method for production of weakly coupled graphene layers by hightemperature sublimation of polycrystalline SiC is presented. The method allows manufacturing carbon-based composite with a high content of weakly coupled graphene layers in large-scale production. The study of the obtained carbon-based material by means of scanning electron microscopy, Raman spectroscopy and atomic force microscopy detected graphene plates with lateral size of up to tens of micrometers. The obtained graphene sheets are shown to have very high crystal perfection, low concentration of defects and weak interlayer coupling, which depends on the growth conditions. The proposed method of producing graphene-based composites is supposed to be very promising due to its relative simplicity and high output

Graphene layers fabricated from the Ni/a-SiC bilayer precursor

This paper considers a synthesis of graphene flakes on the Ni surface by vacuum long and nitrogen rapid thermal treatment of the “sandwich” amorphous (a) SiC/Ni multilayer deposited on silicon wafer by magnetron sputtering technique. The lateral size of graphene flakes was estimated to be about hundreds of micrometers while the thickness estimated using Raman scattering varied from one to few layers in case of vacuum annealing. Rapid thermal annealing (RTA) in nitrogen ambient results in formation of multilayer graphene with surface covering up to 80%. The graphene layers synthesized on Ni during CVD process was used as reference samples. Atomic force microscopy (AFM) is not able to detect graphene flakes in regime of surface topology examination because of large roughness of Ni surface. Employment of scanning Kelvin probe force microscopy (SKPFM) demonstrates correlation of the surface potential and graphene flakes visible in optical microscopy. Using the KPFM method, potential differences between Ni and graphene were determined

Influence of light and heavy lanthanides on the physiological processes of taraxacum hybernum

© 2020, Editorial board of Journal of Experimental Biology and Agricultural Sciences. All rights reserved. The current study was carried out to study the influence of light and heavy lanthanides on the physiological process of Crimean-Sagyz/ Krim-saghyz (dandelion-Taraxacum hybernum). Lanthanide belongs to the group of light or heavy; infiltration of dandelion (Crimean saghyz) seeds with light and heavy lanthanides solutions increased the germination energy by 26%. The differences in the influence of light (cerium) and heavy (lutetium) were manifested in the quantum efficiency change of the photosystem 2 (PS II). Treatment of leaves with high concentrations (100 µM) led to a decrease of Y (II), moreover, under the influence of light lanthanide, the decrease was greater by 21%. It is assumed that the effect of the used lanthanides on the dandelion photosynthetic apparatus is multidirectional. Cerium influenced the PS II antenna complex, and lutetium influenced the reaction centers. A 10-fold decrease in the concentration did not change the nature of cerium action, except that Y (II) was restored already on the second day after treatment. The effect of lutetium became noticeable only by the 8th day after treatment when Y (II) became higher than that of untreated plants. Thus, the results of the study suggested that in dandelion leaves, lanthanides with a concentration of 10 µM increased the quantum efficiency of PS II in contrast to cerium

Вплив дози імплантованих іонів дейтерію на мікроструктуру і наномеханічні властивості кремнію

Імплантація водню в кремній з подальшим відпалом (технологія Smart-Cut) застосовується для виготовлення мікроелектронних пристроїв. Покращені характеристики отриманих структур були досягнуті шляхом імплантації дейтерію замість водню. Метод наноіндентування широко використовується при вимірюванні твердості H та модуля пружності E матеріалів у нанорозмірному масштабі. Метою даної роботи є дослідження впливу дози імплантації іонів дейтерію на структуру та механічні властивості монокристалічного кремнію в нанорозмірному масштабі. Досліджено вплив доз імплантації іонів дейтерію в діапазоні від 2×1015 до 1×1018 D/см2 на структуру та механічні властивості монокристалу кремнію в наномасштабі. Зразки полірованого кремнію (111) імплантували при 293 К пучком іонів дейтерію з енергією 24 кеВ. Методом Раманівської спектроскопії було показано, що в залежності від дози імплантації в кремнії утворюються три структурні стани: дейтерій знаходиться у твердому розчині, суміш аморфної фази кремнію і твердого розчину, і тільки аморфний стан (a-Si:D). Термічна десорбційна спектроскопія показує, що при низьких дозах імплантації в спектрах термодесорбциї дейтерію спостерігається один пік з максимумом при Tmax ~ 575 К, а при дозах вище 5×1017 D/см2 з’являється низькотемпературний пік з максимумом при 500 К, що свідчить про утворення аморфного гідрогенізованого кремнію a-Si:D. Наноіндентування показало, що в режимі повної пластичності в контакті (> 100 нм), утворення твердого розчину дейтерію в кремнії спричиняє збільшення твердості поверхні зразка до 14,1 ГПа. Твердість поверхні різко зменшується до 3,6 ГПа з утворенням шару a-Si:D.Implantation of hydrogen into silicon with subsequent annealing (Smart-Cut Technology) is applied to produce microelectronic devices. Improved characteristics of the resulting structures were achieved by using implantation of deuterium instead of hydrogen. The nanoindentation technique is widely used to measure the hardness H and elasticity modulus E of materials at the nanoscale. The aim of the present work is to investigate the influence of deuterium ion implantation dose on the structure and mechanical properties of single crystal silicon at the nanoscale. The influence of the deuterium ion implantation with an implantation dose ranging from 2×1015 to 1×1018 D/cm2 on the structure and mechanical properties of single crystal silicon at the nanoscale has been investigated. Polished (111) silicon samples were implanted at 293 K by using a deuterium ion beam with an ion energy of 24 keV. It was shown by Raman spectroscopy that, depending on the implantation dose, three structural states are formed in silicon: a solid solution of deuterium (D) in Si, a solid solution mixed with the Si amorphous phase, and an amorphous state (a-Si:D) only. Thermal desorption (TD) spectroscopy shows that at low implantation doses, the deuterium TD spectra exhibit a single peak with a maximum at Tmax ~ 575 K. At doses above 5×1017 D/cm2, a lowtemperature peak with a maximum at 500 K appears that is indicative of the formation of amorphous hydrogenated silicon a-Si:D. Nanoindentation tests have shown that in the regime of full plasticity in the indenter contact region (> 100 nm), the formation of deuterium solid solution in Si causes an increase in the sample surface hardness up to 14.1 GPa. The surface hardness sharply decreased down to 3.6 GPa with the a-Si:D layer formation

Two-photon exchange contribution in elastic electron-proton scattering, experiment at the VEPP-3 storage ring

We describe a precise measurement of the ratio of the (e+ p) to (e− p) elastic scattering cross sections. This comparison is sensitive to the effect of two-photon exchange contributions which may be the cause for inconsistent extractions of the proton form factors obtained using different methods. The experiment was performed at storage ring VEPP–3, Novosibirsk at energies of positron/electron beams of 1.0 and 1.6 GeV with electron/positron scattering angles θ = 65÷105° for the first case and 15÷25° and 55÷75° for the second case. Details of the experiment and the preliminary results are presented