Bispyrenylalkane Chemosensor for the Naked-eye Detection of Nitro-explosives

Pyrene-based compounds have a great potential as fluorescent chemosensors for various analytes including common nitro-explosives, such as 2,4,6-trinitrotoluene (TNT). Compounds having two pyrene units in one molecule, such as bispyrenylalkanes, are able to form stable, bright emissive in a visual wavelength region excimers both in non-polar and polar environments. In this work we wish to report that in non-polar solvents the excimer has poor chemosensing properties while in aqueous solutions it provides significant “turn-off” fluorescence response to TNT in the sub-nanomolar concentrations

Some aspects of gene association with high sport achievements

Most papers on sport genetics identify differences between genotypes of athletes and a control group. It is obvious that the genetic differences should also be among sportsmen with different qualifications. Additionally, athletes’ performance depends not only on their genotypes, but also on the gene activities, which can be different during the training process in various athletes.The aim of the study was to compare genotypes of athletes with different qualifications and to analyze the change in expression of some genes responsible for the physical performance. Genotypes of 143 elite sportsmen of 18 national teams were analyzed by PCR method. A comparison of the genotypes of Masters of Sports, International Masters of Sports and Honored Masters of Sports showed that the frequencies of favorable gene variants were higher in the genotypes of more qualified athletes; it proves an appropriate genetic potential necessity for high achievements in sports. The analysis of UCP2, HIF1A and MTHFR gene expression changes in response to two-week hypoxiс training was performed on 15 skaters of high qualification. We found that average UCP2 and MTHFR mRNA levels had significantly increased after the training but the expression of the HIF1A gene had reduced. At the same time, individual athlete variability in UCP2, HIF1A and MTHFR gene expression was revealed. Genotype influence on gene expression was shown with the help of the UCP2 gene – its activity was higher in sportsmen with Val/Val than with Val/Ala or Ala/Ala genotypes. Consequently, genotyping and analysis of gene expression is very important for athlete selection and training

EXPERIMENTAL RESEARCHING MECHANICAL CHARACTERISTICS AND PLA PLASTIC APPLICABILITY AFTER ELECTRON BEAM RADIATION TREATMENT

In this work, we studied the effect of an electron beam on PLA plastic samples made on a 3D printer was carried out. The samples were irradiated at various doses from 3 to 15 kGy. The results obtained indicate an increase in the hardness and brittleness of PLA plastic com-pared to the control group

Supporting data and methods for the characterization of iron oxide nanoparticles conjugated with pH-(low)-insertion peptide, testing their cytotoxicity and analyses of biodistribution in SCID mice bearing MDA-MB231 tumor

The method of Fe3O4 magnetic nanoparticle synthesis by co-precipitation, modification by 3-aminopropylsilane and conjugation with pH-(low)-insertion peptide (pHLIP) is reported. The characterization of nanoparticles by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, elemental and thermogravimetric analyses as well as dynamic light scattering and z-potential measurements is provided. The effect of nanoparticles on the viability of mouse and human peripheral blood mononuclear cells is tested by flow cytometry. The experimental details of nanoparticle administration to tumor-bearing mice, magnetic resonance imaging scanning as well as subsequent tumor sample collection and their processing for transmission electron microscopy, inductively coupled plasma atomic emission spectroscopy, histological and immunohistochemical analyses are described. Biodistribution of the nanoparticles in mice and blood serum analysis data for experimental animals are given. The data are useful for an experiment workflow design and for the development of theranostic systems based on magnetic nanoparticles. © 2020 The AuthorsRussian Foundation for Basic Research, RFBR: 18-015-00319_aMinistry of Education and Science of the Russian Federation, Minobrnauka: RFMEFI62117X0015This work was supported by the Russian Foundation for Basic Research [grant number 18-015-00319_a ]. The ICP-AES measurements were carried out using the core facilities of TPU's “Physical and chemical methods of analysis” (project VIU-RSCBS-142/2019). The research involving PBMC experiments was carried out within the framework of the state assignment theme (No. AAAA-A18-118031490008-7) of the Siberian State Medical University. The research into nanoparticle characterization by IR spectroscopy, elemental analysis (CHN) and TGA was carried out within the framework of the state assignment theme (No. АААА-А19-119011790130-3) in the Joint-Use Center for Spectroscopy and Analysis of Organic Compounds, Postovsky Institute of Organic Synthesis UB RAS. Dynamic light scattering (DLS) and zeta potential (z P ) characterization were carried out within the framework of the state assignment theme No. АААА-А18-118020290129-5 in the Miheev Institute of Metal Physics UB RAS. The experiments with animals and MRI were carried out at the Center for Genetic Resources of Laboratory Animals at the Institute of Cytology and Genetics SB RAS, supported by the Ministry of Education and Science of Russia (Unique identifier of the project RFMEFI62117X0015 ). TEM analysis was carried out at the Multiple-access Center for Microscopy of Biological Subjects, Institute of Cytology and Genetics SB RAS

Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra

Nanocrystalline TiO2 samples of various compositions (up to 5 at.% Fe) with anatase structure and an average particle size of about 20 nm were synthesized using sol-gel technology. The magnetic properties of nano-TiO2: Fe was studied by electron paramagnetic resonance (EPR) and Faraday balance. The existence of an inhomogeneous magnetic state in TiO2: Fe samples of different compositions were revealed by EPR spectroscopy in a wide temperature range. The analysis of the EPR spectra in the L -, X - and Q-bands allowed us to calculate the quadratic fine structure (D, E) parameters, “axial” and “rhombic” ones, respectively. The value of D turned out to be quite small, which indicates an insignificant anisotropy, which can be ignored describing the magnetic properties of TiO2:Fe. It was shown that the temperature behavior of different separate components of the integral EPR spectra can be qualitatively interpreted in the model of coexistence in the TiO2: Fe system, mainly, dimers with a strong negative exchange interaction and isolated paramagnetic centers. No ferromagnetic state in TiO2: Fe-based samples after etching of aE-prepared state were detected. © 202

Влияние интрамиокардиальной инъекции аутологичных клеток костного мозга, обработанных эритропоэтином, на перфузию миокарда по данным ОФЭКТ с 99mТc-МИБИ в отдаленный период наблюдения

Purpose. To evaluate the changes of myocardial perfusion using 99mТс-MIBI single-photon emission computed tomography (SPECT) after the intramyocardial implantation of erythropoietin preconditioned autologous bone marrow cells (ABMC) in laser channels during coronary artery disease (CAD) surgery.Materials and methods. Randomized study of 40 patients (mean age 58.0 ± 6.9, 9 females) with diffuse and (or) distal right coronary artery disease (RCA). Patients of the study group (n = 23) underwent coronary artery bypass grafting (CABG) of the left coronary artery (LCA) system and intramyocardial implantation of erythropoietin preconditioned ABMC in the left ventricular (LV) inferior wall. Patients of the control group (n = 17) underwent CABG of the LCA system only. 99mТс-MIBI SPECT performed 1–2 days before and 12 months after surgery.Results. In study group after 12-month follow-up the summed stress score in a typical RCA supply area (SSSRCA) improved from 7.0 [5.5; 10.5] to 4.0 [1.0; 5.5] (p <0.01), summed rest score (SRSRCA) improved from 3.0 [0.0; 7.0] to 1.0 [0.0; 3.5] (p <0.01), and summed different score (SDSRCA) improved from 3.0 [1.0; 4.0] to 1.0 [0.0; 2.0] (p = 0.03). Control group patients after 12-month follow-up showed significant improvement of SSS RCA only – from 8.0 [6.0; 12.0] to 5.0 [4.0; 7.0] (p <0.01).Conclusion. After 12-month follow-up in patients with diffuse and (or) distal RCA disease, the procedure of intramyocardial implantation of the erythropoietin preconditioned ABMC in laser channels is demonstrated to be safe and induces the improvement of myocardial perfusion.  Цель – оценить изменения миокардиальной перфузии по данным однофотонной эмиссионной компьютерной томографии (ОФЭКТ) с 99mТс-МИБИ после применения трансмиокардиальной лазерной реваскуляризации в сочетании с имплантацией прекондиционированных эритропоэтином аутологичных клеток костного мозга (АККМ) в хирургии ишемической болезни сердца (ИБС).Материалы и методы. Больные ИБС (n = 40, средний возраст (58,0 ± 6,9) лет, 9 женщин) с диффузным и (или) дистальным поражением правой коронарной артерии (ПКА) рандомизированы на две группы. Пациентам из группы исследования (n = 23) выполнено аортокоронарное шунтирование (АКШ) системы левой коронарной артерии (ЛКА) c имплантацией прекондиционированных эритропоэтином АККМ в область нижней стенки левого желудочка (ЛЖ), пациентам из группы контроля (n = 17) выполнено АКШ системы ЛКА. Оценка показателей перфузии миокарда (SSS, SRS, SDS) по данным ОФЭКТ с 99mТс-МИБИ проведена за 1–2 сут до и через 12 мес после оперативного лечения.Результаты. При прицельной оценке перфузии миокарда в типичном бассейне кровоснабжения ПКА у пациентов из группы исследования выявили уменьшение SSSRCA с 7,0 [5,5; 10,5] до 4,0 [1,0; 5,5] (p < 0,01), SRSRCA с 3,0 [0,0; 7,0] до 1,0 [0,0; 3,5] (p < 0,01) и SDSRCA с 3,0 [1,0; 4,0] до 1,0 [0,0; 2,0] (p = 0,03). У пациентов из группы контроля в бассейне кровоснабжения ПКА выявили значимое уменьшение только SSSRCA c 8,0 [6,0; 12,0] до 5,0 [4,0; 7,0] (p < 0,01).Заключение. В отдаленные сроки наблюдения процедура трансмиокардиальной лазерной реваскуляризации в сочетании с имплантацией прекондиционированных эритропоэтином АККМ вызывает улучшение перфузии миокарда у пациентов с диффузным и (или) дистальным поражением ПКА

Selective Pressure to Increase Charge in Immunodominant Epitopes of the H3 Hemagglutinin Influenza Protein

The evolutionary speed and the consequent immune escape of H3N2 influenza A virus make it an interesting evolutionary system. Charged amino acid residues are often significant contributors to the free energy of binding for protein–protein interactions, including antibody–antigen binding and ligand–receptor binding. We used Markov chain theory and maximum likelihood estimation to model the evolution of the number of charged amino acids on the dominant epitope in the hemagglutinin protein of circulating H3N2 virus strains. The number of charged amino acids increased in the dominant epitope B of the H3N2 virus since introduction in humans in 1968. When epitope A became dominant in 1989, the number of charged amino acids increased in epitope A and decreased in epitope B. Interestingly, the number of charged residues in the dominant epitope of the dominant circulating strain is never fewer than that in the vaccine strain. We propose these results indicate selective pressure for charged amino acids that increase the affinity of the virus epitope for water and decrease the affinity for host antibodies. The standard PAM model of generic protein evolution is unable to capture these trends. The reduced alphabet Markov model (RAMM) model we introduce captures the increased selective pressure for charged amino acids in the dominant epitope of hemagglutinin of H3N2 influenza (R2 > 0.98 between 1968 and 1988). The RAMM model calibrated to historical H3N2 influenza virus evolution in humans fit well to the H3N2/Wyoming virus evolution data from Guinea pig animal model studies

Клинико-функциональная оценка интрамиокардиальной имплантации аутологичных клеток костного мозга, обработанных эритропоэтином, в хирургии ИБС (6-месячные результаты)

Aim. Clinical and functional evaluation of the implantation of autologous bone marrow cells treated with erythropoietin in laser channels during coronary bypass grafting in patients with end-stage coronary lesion.Materials and methods. 60 patients with coronary artery disease with diffuse and (or) distal right coronary artery disease were randomized into two groups: patients of group 1 (n = 30) underwent coronary bypass grafting, implantation of autologous bone marrow cells treated with erythropoietin in laser channels, patients of the 2nd group (n = 30) were operated with coronary bypass grafting of the left coronary artery system. Assessment of the clinical status, myocardial perfusion and contractility was performed initially, 6 months after the operation.Results. Six months after the operation, there was a more pronounced decrease in angina pectoris (CCS) in the main group compared to the control group, also we revealed a 6-minute walk test scores improvement. Based on two-stage scintigraphy (Tc99) in the main group before the surgical treatment, a rest perfusion defect was 8.5% [3.5, 18.5], a stress-induced perfusion defect – 7.0% [6.0, 12, 3]. In the control group, the rest defect was 9.1% [5.6, 12.4], the stress-induced perfusion defect was 7.3% [6.1, 8.7]. 6 months after surgery rest perfusion defect at the indirect revascularization group was 6.0% [2.5, 16.5] (p = 0.008), a stress-induced defect was 4.0% [1.5, 6.3] (p = 0.05). In the control group, the rest defect was 8.7% [5.3, 10.3], the stress-induced perfusion defect was 6.8% [5.3, 9.1] (p = 0.21). The results of scintigraphy with MIBG showed a left ventricle innervation defect (PID) significant decrease in the main group: initially 15.4% [14.2, 16.3], after 6 months 11.7% [9.3, 13, 2] (p = 0.045). In the control group, there was an unreliable decrease in PID: initially 14.3% [10.2, 17.3], after 6 months 13.8% [9.1, 14.2] (p = 0.14).Conclusion. Our preliminary results revealed more pronounced effect of the new indirect revascularization method expressed as in myocardial perfusion improve, myocardial sympathetic innervation restoration and clinical status improvement in comparison with control group.Цель. Клинико-функциональная оценка эффекта применения трансмиокардиальной лазерной реваскуляризации в сочетании с имплантацией прекондиционированных эритропоэтином клеток аутологичного костного мозга в хирургии ишемической болезни сердца.Материалы и методы. Больные ИБС с диффузным и(или) дистальным поражением правой коронарной артерии (n = 60) рандомизированы на две группы: пациентам 1-й группы (n = 30) выполнено коронарное шунтирование, c имплантацией прекондиционированных эритропоэтином клеток аутологичного костного мозга в область нижней стенки левого желудочка, пациентам 2-й группы (группа контроля, n = 30) выполнено коронарное шунтирование системы левой коронарной артерии. Оценка клинического статуса, перфузии и сократительной способности миокарда выполнена исходно, через 6 месяцев после операции.Результаты. Через 6 месяцев после операции выявлено более выраженное снижение функционального класса (ФК) стенокардии (ССS) в основной группе по сравнению с группой контроля, улучшение показателей теста 6-минутной ходьбы. По результатам двухэтапной сцинтиграфии миокарда с технетрилом (Тс99) М в основной группе до хирургического лечения отмечен стойкий дефект перфузии 8,5% [3,5; 18,5], стресс-индуцированный дефект перфузии 7,0% [6,0; 12,3]. В контрольной группе – стабильный дефект 9,1% [5,6; 12,4], стресс-индуцированный дефект перфузии 7,3% [6,1; 8,7]. Через 6 месяцев в основной группе стойкий дефект перфузии составил 6,0% [2,5; 16,5] (p = 0,008), стресс-индуцированный дефект – до 4,0% [1,5; 6,3] (p = 0,05). В контрольной группе – стабильный дефект 8,7% [5,3; 10,3], стресс-индуцированный дефект перфузии 6,8% [5,3; 9,1] (р = 0,21). Результаты сцинтиграфии с МIBG демонстрируют значимое уменьшение площади дефекта иннервации (ПДИ) в сегментах нижней стенки левого желудочка в основной группе: исходно 15,4% [14,2; 16,3], через 6 месяцев 11,7% [9,3; 13,2] (р = 0,045). В контрольной группе выявлено недостоверное уменьшение ПДИ: исходно 14,3% [10,2; 17,3], через 6 месяцев 13,8% [9,1; 14,2] (р = 0,14).Заключение. Исследование продемонстрировало улучшение перфузии в зоне непрямой реваскуляризации, восстановление симпатической иннервации миокарда, лучшие показатели ФК (CCS), теста 6-минутной ходьбы у пациентов в основной группе