35 research outputs found
Modifying Effect of Tungsten on Vacuum Condensates of Iron
Laws of the structure formation, as well as the strength properties and thermal stability of vacuum condensates of the FeāW system have been studied. It has been found that the alloying of iron foils with tungsten to 1 at % makes it possible to disperse the grained structure of the condensates to nanometric dimensionality and to markedly enhance their strength properties and recrystallization temperature. Thus, the foils containing ~0.8% tungsten and grains of about 50 nm in size exhibit the hardness 5.5 GPa and recrystallization temperature 800Ā°C. These results can be used to devise compositions of the steels designed for subsequently obtaining high-strength and thermostable nanostructural states
Immunoglobulins and predicted mortality in clinical course of concomitant HIV and TB infection
A search for prognostic markers of HIV and tuberculosis coinfection (HIV/TB), especially in case of Mycobacterium tuberculosis multidrug resistance (MDR MBT) associated with low rates of TB eradication, is of relevance in connection with the problem of choosing adequate anti-TB therapy which is able to decrease mortality. 113 HIV/TB patients aged 24 to 58 years were examined: 70 males and 43 females hospitalized at the Novokuznetsk TB Clinic during the 2017ā2019 period. MDR MBT (concomitant resistance to Isoniazid and Rifampicin) was found in 50 patients (12 patients with MDR MBT had additional resistance to Fluoroquinolones) aged 24 to 54 years ā 31 males and 19 females. The control group consisted of 49 healthy individuals aged 27 to 72 years (26 females and 23 males) lacking focal and systemic infections with moderately pronounced age-related changes. In plasma samples, concentration of total (non-specific) immunoglobulins of classes E, M, G, A (including secretory immunoglobulin A, sIgA) were measured by using enzyme-linked immunosorbent assay. Data statistical processing was performed by using licensed software packages InStatII, Microsoft Excel, IBM SPSS Statistics 22. An extended range of individual variability in count of peripheral blood CD4 lymphocytes was revealed both among non-survivor and survivor patients with HIV/TB examined, being a drawback of using such parameter as lethality predictor. It was found that the serum level of total IgE, IgM, IgG, IgA and sIgA in patients with HIV/ TB was higher than that one in control group, whereas in non-survivor vs. survivor patients the concentration of IgE and sIgA was elevated. The coefficient of disease outcome prediction (CP) for patients with HIV/TB and MDR MBT was calculated being equal to the ratio of the multiplication of serum concentration of IgE, IgM, IgA and secretory IgA to CD4 lymphocyte count (CP = IgE x IgM x IgA x sIgA/CD4). CP higher than 200 was detected in 77% non-survivor and 6% of survivor patients. The relative risk of death with CP > 200 was very high (OR = 56.7, p < 0.0001) being 8.5 times higher than that one upon CD4 < 200 (OR = 6.7, p = 0.0237). A positive correlation between CP and lethal outcome was more valuable than that of CD4. The data presented allow us to propose CP for clinical use as an effective prognostic criterion for HIV/TB with MDR MBT
The relationship between self-organization and membrane effects of aqueous dispersion systems of the thyroliberin oligopeptide
Ā© 2017, Pleiades Publishing, Ltd. The relationship between rearrangement of the dispersed phase inducing considerable changes in the pH and nonmonotonic concentration dependences of membrane effects in aqueous systems of the endogenous regulatory peptide, thyroliberin (thyrotropin-releasing hormone), in 10 ā3 ā10 ā16 mol/L concentration range was demonstrated for the first time. The membrane structure modification in the 10 ā13 ā10 ā16 mol/L range was found to be due to accumulation of nanoassociates, while the oppositely directed pronounced structural changes in the 10 ā6 ā10 ā12 mol/L range may be associated with the coexistence and rearrangement of dispersed phases of various nature (domains and associates) whose action on membrane lipid components is regulated in this concentration range by the correlated changes in the dispersed phase parameters and pH
HE DEPENDENCE OF IMMUNOGLOBULIN IGA AND IGE TEAR LEVELS FROM GLUTATHIONES-TRANSFERASE P1 GENE POLYMORPHISMS IN STEELWORKERS WITH OPHTHALMOPATHY
Abstract.Ā AssociationsĀ betweenĀ I105VĀ andĀ A114V geneĀ polymorphismsĀ ofĀ glutathione-S-transferase P1Ā andĀ levelsĀ ofĀ IgEĀ andĀ secretoryĀ IgAĀ inĀ tearĀ fluid wereĀ studiedĀ inĀ steelworkersĀ withĀ orĀ withoutĀ ocular diseases,Ā asĀ comparedĀ withĀ healthyĀ officeĀ employees. Genotyping was performed by means of allele-specific polymerase chain reaction, whereas ELISA technique was used for immune testing. We have found that IgE levels in tear fluid was increased in steelworkers with dystrophic eye diseases, pinguecula/pterygium, and healthy steelworkers, in comparison with control group. This increase correlates with pinguecula/pterygium size and with their industrial employment terms. Secretory IgŠ levels in tears were decreased in these groups of workers, as compared with controls. Concentrations of bothĀ immunoglobulinsĀ inĀ tearĀ samplesĀ dependedĀ onĀ I105VĀ andĀ Š114VĀ glutathione-S-transferaseĀ P1Ā gene polymorphisms. I105V polymorphism correlated with lower concentrations of tear IgŠ in steelworkers with ocularĀ dystrophicĀ diseasesĀ andĀ healthyĀ metallurgists.Ā Š114VĀ polymorphismĀ isĀ connectedĀ withĀ decreased quantities of tear IgŠ in steelworkers with ocular dystrophic diseases, as well as with the lower amounts of secretoryĀ IgŠĀ inĀ healthyĀ workersĀ andĀ administrativeĀ staff.Ā Hence,Ā polymorphicĀ lociĀ I105VĀ andĀ Š114VĀ of glutathione-S-transferase P1 gene may exert a modulatory effect upon biosynthesis of both Ig types. (Med. Immunol., 2011, vol. 13, N 6, pp 609-616
SERUM SECRETORY IMMUNOGLOBULIN A AND Gln223Arg POLYMORPHISM OF THE LEPR GENE IN ALCOHOLIC AND NON-ALCOHOLIC FATTY LIVER DISEASES
Level of serum secretory immunoglobulin A was investigated in alcoholic liver disease (ALD, 59 menĀ and 23 women) and non-alcoholic fatty liver disease (NAFLD, 17 men and 93 women).The data were comparedĀ with those of persons without liver pathology (control group, 43 men and 73 women). Moreover, we studiedĀ possible associations between ssIgA level and Gln223Arg polymorphism of the LEPR gene. ImmunologicalĀ and DNA diagnostics was performed by means of, respectively, ELISA and allele-specific polymerase chainĀ reaction. We have found that the average level of ssIgA was three times higher in ALD group (11.45Ā±0.82 mg/l),Ā than in the NAFLD group (4.35Ā±0.35 mg/l) or in controls (3,60Ā±0,29 mg/l). SsIgŠ concentration did notĀ depend on adiposity and gender. The ssIgŠ concentration proved to be increased in Gln223Arg heterozygotesĀ with NAFLD, when compared with controls. However, the frequency of 223Arg and 223Gln alleles wasĀ virtually equal in all observed groups with above-normal concentration of ssIgŠ, as compared to a sub-groupĀ with normal ssIgŠ concentration. Hence, we have not revealed any significant association between Gln223ArgĀ polymorphism of LEPR and ssIgA level. The data obtained will be useful for studying genetic risk factors inĀ development of infectious mucosŠ°l lesions
The relationship between self-organization and membrane effects of aqueous dispersion systems of the thyroliberin oligopeptide
Ā© 2017, Pleiades Publishing, Ltd. The relationship between rearrangement of the dispersed phase inducing considerable changes in the pH and nonmonotonic concentration dependences of membrane effects in aqueous systems of the endogenous regulatory peptide, thyroliberin (thyrotropin-releasing hormone), in 10 ā3 ā10 ā16 mol/L concentration range was demonstrated for the first time. The membrane structure modification in the 10 ā13 ā10 ā16 mol/L range was found to be due to accumulation of nanoassociates, while the oppositely directed pronounced structural changes in the 10 ā6 ā10 ā12 mol/L range may be associated with the coexistence and rearrangement of dispersed phases of various nature (domains and associates) whose action on membrane lipid components is regulated in this concentration range by the correlated changes in the dispersed phase parameters and pH
The relationship between self-organization and membrane effects of aqueous dispersion systems of the thyroliberin oligopeptide
Ā© 2017, Pleiades Publishing, Ltd. The relationship between rearrangement of the dispersed phase inducing considerable changes in the pH and nonmonotonic concentration dependences of membrane effects in aqueous systems of the endogenous regulatory peptide, thyroliberin (thyrotropin-releasing hormone), in 10 ā3 ā10 ā16 mol/L concentration range was demonstrated for the first time. The membrane structure modification in the 10 ā13 ā10 ā16 mol/L range was found to be due to accumulation of nanoassociates, while the oppositely directed pronounced structural changes in the 10 ā6 ā10 ā12 mol/L range may be associated with the coexistence and rearrangement of dispersed phases of various nature (domains and associates) whose action on membrane lipid components is regulated in this concentration range by the correlated changes in the dispersed phase parameters and pH
The relationship between self-organization and membrane effects of aqueous dispersion systems of the thyroliberin oligopeptide
Ā© 2017, Pleiades Publishing, Ltd. The relationship between rearrangement of the dispersed phase inducing considerable changes in the pH and nonmonotonic concentration dependences of membrane effects in aqueous systems of the endogenous regulatory peptide, thyroliberin (thyrotropin-releasing hormone), in 10 ā3 ā10 ā16 mol/L concentration range was demonstrated for the first time. The membrane structure modification in the 10 ā13 ā10 ā16 mol/L range was found to be due to accumulation of nanoassociates, while the oppositely directed pronounced structural changes in the 10 ā6 ā10 ā12 mol/L range may be associated with the coexistence and rearrangement of dispersed phases of various nature (domains and associates) whose action on membrane lipid components is regulated in this concentration range by the correlated changes in the dispersed phase parameters and pH
Possibility to Obtain Anti-Athrax Human Immunoglobulin for Intravenous Injection
For the first time specific Ig was obtained from blood plasma of donors immunized by combined anthrax vaccine. This Ig conforms to quality standards for intravenous immunoglobulins and includes antibodies toĀ Bacillus anthracisĀ protective antigen in titer 1:1600 - 1:3200. Therapeutic and prophylactic efficacy of experimental-production series of preparation was demonstrated in experiments with animals