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Karmanova EE, Chernikov AV, Popova NR, Sharapov MG, Ivanov VE, Bruskov VI. Metformin mitigates radiation toxicity exerting antioxidant and genoprotective properties. Naunyn Schmiedebergs Arch Pharmacol 2023; 396:2449-2460. [PMID: 36961549 PMCID: PMC10036983 DOI: 10.1007/s00210-023-02466-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 03/14/2023] [Indexed: 03/25/2023]
Abstract
The antidiabetic drug metformin (MF) exhibits redox-modulating effects in various pathologies associated with oxidative stress and mitigates ionizing radiation-induced toxicity, but the underlying mechanisms remain to be elucidated. Thus, we studied some radiomitigatory effects of MF and explored the possible mechanisms behind them. Highly sensitive luminescence methods and non-competitive enzyme-linked immunosorbent assay (ELISA) were used in in vitro studies, and in vivo the damage to bone marrow cells and its repair were assessed by the micronucleus test. In a solution, MF at concentrations exceeding 0.1 µM effectively intercepts •OH upon X-ray-irradiation, but does not react directly with H2O2. MF accelerates the decomposition of H2O2 catalyzed by copper ions. MF does not affect the radiation-induced formation of H2O2 in the solution of bovine gamma-globulin (BGG), but has a modulating effect on the generation of H2O2 in the solution of bovine serum albumin (BSA). MF at 0.05-1 mM decreases the radiation-induced formation of 8-oxoguanine in a DNA solution depending on the concentration of MF with a maximum at 0.25 mM. MF at doses of 3 mg/kg body weight (bw) and 30 mg/kg bw administered to mice after irradiation, but not before irradiation, reduces the frequency of micronucleus formation in polychromatophilic erythrocytes of mouse red bone marrow. Our work has shown that the radiomitigatory properties of MF are mediated by antioxidant mechanisms of action, possibly including its ability to chelate polyvalent metal ions.
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Affiliation(s)
- Ekaterina E Karmanova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow Region, 142290, Russia
- Institute of Cell Biophysics, Pushchino Scientific Center for Biological Research, Federal Research Center of the Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Anatoly V Chernikov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow Region, 142290, Russia.
| | - Nelli R Popova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow Region, 142290, Russia
| | - Mars G Sharapov
- Institute of Cell Biophysics, Pushchino Scientific Center for Biological Research, Federal Research Center of the Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Vladimir E Ivanov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow Region, 142290, Russia
| | - Vadim I Bruskov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow Region, 142290, Russia
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Karmanova E, Chernikov A, Usacheva A, Ivanov V, Bruskov V. Metformin counters oxidative stress and mitigates adverse effects of radiation exposure: An overview. Fundam Clin Pharmacol 2023. [PMID: 36852652 DOI: 10.1111/fcp.12884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 01/19/2023] [Accepted: 02/15/2023] [Indexed: 03/01/2023]
Abstract
Metformin (1,1-dimethylbiguanidine hydrochloride) (MF) is a drug that has long been in use for the treatment of type 2 diabetes mellitus and recently is coming into use in the radiation therapy of cancer and other conditions. Exposure to ionizing radiation disturbs the redox homeostasis of cells and causes damage to proteins, membranes, and mitochondria, destroying a number of biological processes. After irradiation, MF activates cellular antioxidant and repair systems by signaling to eliminate the harmful consequences of disruption of redox homeostasis. The use of MF in the treatment of the negative effects of irradiation has great potential in medical patients after radiotherapy and in victims of nuclear accidents or radiologic terrorism.
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Affiliation(s)
- Ekaterina Karmanova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia.,Institute of Cell Biophysics, Pushchino Scientific Center for Biological Research, Federal Research Center of the Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Anatoly Chernikov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Anna Usacheva
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Vladimir Ivanov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Vadim Bruskov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
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Yaglova NV, Timokhina EP, Obernikhin SS, Yaglov VV. Emerging Role of Deuterium/Protium Disbalance in Cell Cycle and Apoptosis. Int J Mol Sci 2023; 24:ijms24043107. [PMID: 36834518 PMCID: PMC9963022 DOI: 10.3390/ijms24043107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/21/2023] [Accepted: 02/02/2023] [Indexed: 02/09/2023] Open
Abstract
Deuterium, a stable isotope of hydrogen, is a component of water and organic compounds. It is the second most abundant element in the human body after sodium. Although the concentration of deuterium in an organism is much lower than that of protium, a wide variety of morphological, biochemical, and physiological changes are known to occur in deuterium-treated cells, including changes in fundamental processes such as cell division or energy metabolism. The mode and degree of changes in cells and tissues, both with an increase and a decrease in the concentration of deuterium, depends primarily on the time of exposure, as well as on the concentration. The reviewed data show that plant and animal cells are sensitive to deuterium content. Any shifts in the D/H balance outside or inside cells promote immediate responses. The review summarizes reported data on the proliferation and apoptosis of normal and neoplastic cells in different modes of deuteration and deuterium depletion in vivo and in vitro. The authors propose their own concept of the effects of changes in deuterium content in the body on cell proliferation and death. The altered rate of proliferation and apoptosis indicate a pivotal role of the hydrogen isotope content in living organisms and suggest the presence of a D/H sensor, which is yet to be detected.
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Kardash EV, Petrova NV, Khakimova GR, Tarasov SA, Epstein OI, Peyon G, Esneault E. Nootropic Activity of Prospekta in a Blind Placebo-Controlled Study in a Model of Focal Cerebral Ischemia in Rats. Bull Exp Biol Med 2023; 174:435-439. [PMID: 36892672 DOI: 10.1007/s10517-023-05724-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
Analysis of the pharmacological activity of the original drug Prospekta in a rat model of focal cerebral ischemia revealed its nootropic effect: course treatment in the post-ischemic period led to recovery of the neurological status of animals at the peak of neurological deficit. Evaluation of the therapeutic potential of the drug in morphological and functional CNS disorders allowed us to conclude that it is advisable to carry out further studies of its biological activity at the preclinical stage (the results obtained in animals were successfully confirmed in a clinical trial of drug efficacy in the treatment of moderate cognitive disorders in the early recovery period after ischemic stroke). Studies of the nootropic activity in other pathologies of the nervous system are also promising.
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Affiliation(s)
- E V Kardash
- Research Institute of General Pathology and Pathophysiology, Moscow, Russia.
- LLC "MATERIA MEDICA HOLDING", Moscow, Russia.
| | - N V Petrova
- Research Institute of General Pathology and Pathophysiology, Moscow, Russia
- LLC "MATERIA MEDICA HOLDING", Moscow, Russia
| | | | - S A Tarasov
- Research Institute of General Pathology and Pathophysiology, Moscow, Russia
- LLC "MATERIA MEDICA HOLDING", Moscow, Russia
| | - O I Epstein
- Research Institute of General Pathology and Pathophysiology, Moscow, Russia
- LLC "MATERIA MEDICA HOLDING", Moscow, Russia
| | - G Peyon
- Porsolt and Partners Pharmacology, Le Genest-Saint-Isle, France
| | - E Esneault
- Porsolt and Partners Pharmacology, Le Genest-Saint-Isle, France
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Petrova NV, Emelyanova AG, Tarasov SA, Glubokova ЕА, Каrtashova NP. Antiviral Activity of Technologically Processed Antibodies to CD4 Receptor against Influenza Infection. Bull Exp Biol Med 2023; 174:250-253. [PMID: 36600043 PMCID: PMC9812737 DOI: 10.1007/s10517-023-05683-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Indexed: 01/06/2023]
Abstract
The antiviral activity of technologically processed antibodies to CD4 receptor was evaluated a model of sublethal A/California/04/2009 (H1N1)pdm09-induced influenza infection in female BALB/c mice. The technologically processed antibodies increased animal survival rate by 50% in comparison with the placebo group (p<0.05), which correlated with significant inhibition of virus replication in the lungs (p<0.05). The reference drug Tamiflu increased mouse survival rate (by 47%), decreased the virus titer in the lungs, and prevented body weight loss (p<0.05 in comparison with the placebo group by all parameters). The intrinsic protective activity of technologically processed antibodies to CD4 receptor was demonstrated, which manifested in a decrease in viral load in the lower respiratory tract and an increase in the survival rate.
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Affiliation(s)
- N. V. Petrova
- grid.466466.0Research Institute of General Pathology and Pathophysiology, Moscow, Russia ,LLC “MATERIA MEDICA HOLDING”, Moscow, Russia
| | - A. G. Emelyanova
- grid.466466.0Research Institute of General Pathology and Pathophysiology, Moscow, Russia ,LLC “MATERIA MEDICA HOLDING”, Moscow, Russia
| | - S. A. Tarasov
- grid.466466.0Research Institute of General Pathology and Pathophysiology, Moscow, Russia ,LLC “MATERIA MEDICA HOLDING”, Moscow, Russia
| | - Е. А. Glubokova
- grid.419647.9I. I. Mechnikov Research Institute of Vaccines and Sera, Moscow, Russia
| | - N. P. Каrtashova
- grid.419647.9I. I. Mechnikov Research Institute of Vaccines and Sera, Moscow, Russia
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Lin Y, Diao M, Dai J, Xu Z, Zhao X, Wen X, Xing L, Zhou X, Chen Q, Liu J, Wu K. Molecular insight into on-surface chemistry of an organometallic polymer. Phys Chem Chem Phys 2023; 25:1006-1013. [PMID: 36533548 DOI: 10.1039/d2cp04858b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A molecular investigation of Cu-elimination and subsequent C-C coupling of DCTP (4,4''-dichloro-1,1':3',1''-terphenyl)-Cu organometallic (OM) polymers on Cu(111) is conducted by scanning tunneling microscopy and spectroscopy, revealing that the Cu adatoms embedded in the DCTP-Cu chains are located at the hollow and bridge sites on the Cu(111) surface. The difference in the catalytic activities of these surface sites leads to stepwise elimination of Cu adatoms in the OM chains. Moreover, the interchain interaction plays an important role in the Cu-elimination process of the DCTP-Cu chains as well. The interchain steric hindrance, on the one hand, induces the formation of Cu-eliminated intermediates that are scarcely observed in other Ullmann coupling systems, and on the other hand, promotes the cooperative Cu-elimination and C-C coupling of the OM segments in neighboring chains. These findings demonstrate the key role of the molecule-substrate and intermolecular interactions in mediating the reaction processes of the extended molecular systems on the surface.
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Affiliation(s)
- Yuxuan Lin
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Mengxiao Diao
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Jingxin Dai
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Zhen Xu
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Xinwei Zhao
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Xiaojie Wen
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Lingbo Xing
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Xiong Zhou
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Qiwei Chen
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Jing Liu
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Kai Wu
- BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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Gudkov SV, Li R, Serov DA, Burmistrov DE, Baimler IV, Baryshev AS, Simakin AV, Uvarov OV, Astashev ME, Nefedova NB, Smolentsev SY, Onegov AV, Sevostyanov MA, Kolmakov AG, Kaplan MA, Drozdov A, Tolordava ER, Semenova AA, Lisitsyn AB, Lednev VN. Fluoroplast Doped by Ag 2O Nanoparticles as New Repairing Non-Cytotoxic Antibacterial Coating for Meat Industry. Int J Mol Sci 2023; 24:ijms24010869. [PMID: 36614309 PMCID: PMC9821803 DOI: 10.3390/ijms24010869] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 01/05/2023] Open
Abstract
Foodborne infections are an important global health problem due to their high prevalence and potential for severe complications. Bacterial contamination of meat during processing at the enterprise can be a source of foodborne infections. Polymeric coatings with antibacterial properties can be applied to prevent bacterial contamination. A composite coating based on fluoroplast and Ag2O NPs can serve as such a coating. In present study, we, for the first time, created a composite coating based on fluoroplast and Ag2O NPs. Using laser ablation in water, we obtained spherical Ag2O NPs with an average size of 45 nm and a ζ-potential of -32 mV. The resulting Ag2O NPs at concentrations of 0.001-0.1% were transferred into acetone and mixed with a fluoroplast-based varnish. The developed coating made it possible to completely eliminate damage to a Teflon cutting board. The fluoroplast/Ag2O NP coating was free of defects and inhomogeneities at the nano level. The fluoroplast/Ag2O NP composite increased the production of ROS (H2O2, OH radical), 8-oxogualnine in DNA in vitro, and long-lived active forms of proteins. The effect depended on the mass fraction of the added Ag2O NPs. The 0.01-0.1% fluoroplast/NP Ag2O coating exhibited excellent bacteriostatic and bactericidal properties against both Gram-positive and Gram-negative bacteria but did not affect the viability of eukaryotic cells. The developed PTFE/NP Ag2O 0.01-0.1% coating can be used to protect cutting boards from bacterial contamination in the meat processing industry.
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Affiliation(s)
- Sergey V. Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- All-Russia Research Institute of Phytopathology of the Russian Academy of Sciences, Institute St., 5, Big Vyazyomy, 143050 Moscow, Russia
- Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, 603105 Nizhny Novgorod, Russia
| | - Ruibin Li
- School for Radiologic and Interdisciplinary Science, Soochow University, Suzhou 215123, China
| | - Dmitriy A. Serov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
| | - Dmitriy E. Burmistrov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Ilya V. Baimler
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Alexey S. Baryshev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Alexander V. Simakin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Oleg V. Uvarov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Maxim E. Astashev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
| | - Natalia B. Nefedova
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
- Federal State Budget Educational Institution of Higher Education Pushchino State Institute of Natural Science, Science Av. 3, 142290 Pushchino, Russia
| | | | - Andrey V. Onegov
- Mari State University, pl. Lenina, 1, 424001 Yoshkar-Ola, Russia
| | - Mikhail A. Sevostyanov
- All-Russia Research Institute of Phytopathology of the Russian Academy of Sciences, Institute St., 5, Big Vyazyomy, 143050 Moscow, Russia
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Alexey G. Kolmakov
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Mikhail A. Kaplan
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Andrey Drozdov
- Institute for Analytical Instrumentation of the Russian Academy of Sciences, Ulitsa Ivana Chernykh, 31–33, lit. A, 198095 St. Petersburg, Russia
| | - Eteri R. Tolordava
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Anastasia A. Semenova
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Andrey B. Lisitsyn
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Vasily N. Lednev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Correspondence:
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Burmistrov D, Serov D, Grigorieva D, Simakin A. Physicochemical, Antibacterial, and Cytotoxic Properties of Composite Materials Based on Biodegradable Poly (Lactic-Co-Glycolic Acid) Functionalized with Zno Nanoparticles. BIO Web Conf 2023. [DOI: 10.1051/bioconf/20235702005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
One of the tasks of modern nanotechnology is the creation of new materials with a wide range of applications and good antibacterial activity. In this work, we developed a new composite material based on poly(lactic-co-glycolic acid) and zinc oxide nanoparticles. The resulting material had a smooth surface without microdefects. The polymer matrix did not affect the generation of reactive oxygen species, 8-oxoguanine, and long-lived protein forms. The addition of ZnO-NPs enhanced the generation of these compounds. The addition of ZnO-NPs to the polymer at a concentration of 0.001-0.1 wt% made it possible to achieve a significant bacteriostatic effect, while not affecting the growth, division, and viability of eukaryotic cells. The resulting composite material is of great interest for biomedical use and the food industry due to controlled biodegradability and antibacterial activity.
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Nagaev EI, Baimler IV, Baryshev AS, Reut VE, Astashev ME. Interaction of Nd:YAG Laser Radiation with Bovine Serum Albumin Solution. BIO Web Conf 2023. [DOI: 10.1051/bioconf/20235702006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
In this paper, the effect of Nd:YAG laser radiation on the properties of the BSA protein is investigated. A solution with a protein concentration of 5 mg/ml was irradiated for 30 minutes. After a 5-minute and 30-minute exposure, absorption spectra were taken, the particle size in the solution was determined by dynamic light scattering (DLS), the refractive index was determined, and fluorescent maps were taken. Raman spectroscopy of proteins was also performed. The results showed that after irradiation, the absorption of the protein solution decreases in the spectral range corresponding to amino acid residues. In DLS experiments, it was shown that the peak corresponding to protein molecules decreases, and the peaks corresponding to large aggregates (>100 nm) grow. Raman spectroscopy has shown that there is a decrease in intensity at a wavelength of 1570 cm-1. There were no significant changes in the refractive indices and the shape of the fluorescent maps. The data suggest that partial denaturation of proteins took place.
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Avdeeva MG, Belousova ON, Orlova EA, Khamitov RF, Shvarts YG, Kravchenko IE. Non-specific prevention of COVID-19 during vaccination against a new coronavirus infection: results of a multicenter, double-blind, placebo-controlled, randomized clinical trial. TERAPEVT ARKH 2022; 94:1268-1277. [PMID: 37167165 DOI: 10.26442/00403660.2022.11.201980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 12/26/2022] [Indexed: 12/27/2022]
Abstract
Background. A multicenter, double-blind, placebo-controlled, randomized clinical trial (RCT) of the phase III efficacy and safety of Ergoferon for the non-specific prevention of COVID-19 during vaccination against a new coronavirus infection was conducted (permission of the Ministry of Health of the Russian Federation №559 dated 22.09.2021; ClinicalTrials.gov Identifier: NCT05069649).
Aim. To evaluate the efficacy and safety of the use of Ergoferon for the non-specific prevention of COVID-19 during vaccination against a new coronavirus infection.
Materials and methods. From October 2021 to April 2022, 1,057 patients aged 18 to 92 years who received component I of the Gam-COVID-Vac vaccine were included. After screening, 1,050 patients were randomized into 2 groups: 526 people received Ergoferon according to the prophylactic scheme 1 tablet per administration 2 times a day for 3 weeks, the drug is not allowed during the meal and should be kept in the mouth without swallowing, until completely dissolved; 524 patients received a placebo according to the Ergoferon scheme. The total duration of participation in the study was 5 weeks + 3 days. The primary endpoint is the number of RT-PCR confirmed cases of SARS-CoV-2 infection, regardless of the presence of symptoms during participation in the study. An additional criterion of effectiveness is the proportion of those hospitalized with COVID-19. The safety assessment included consideration of the presence and nature of adverse events (AEs), their severity, relationship with the drug intake, and outcome. Statistical data processing was carried out using SAS 9.4 with the calculation of the exact Fisher test, 2 test, CochraneMantelHensel test, Wilcoxon test and other parameters.
Results. The ITT (Intention-to-treat) and PP [Per Protocol] efficacy analysis included data from 1,050 [970] patients: 526 [489] people Ergoferon group and 524 [481] people Placebo group. The primary endpoint the number of laboratory-confirmed cases of SARS-CoV-2 infections was 3 times less compared to placebo 7 (1.43%) vs 22 (4.57%), respectively (p=0.0046; [p=0.0041]). Taking Ergoferon reduces the risk of SARS-CoV-2 infection by more than 3 times in vaccinated patients during 5 weeks of the vaccination and post-vaccination periods (p=0.0046 [p=0.0041]). Of the COVID-19 patients in the Ergoferon group (1.33%) nobody was hospitalized. According to the Post hoc analysis, Ergoferon reduces the risk of COVID-19 disease by 4 times in the period between the components I and II of the Gam-COVID-Vac vaccine (p=0.0066 [p=0.006]). The frequency of AEs in both groups did not differ. There were no registered AEs associated with the drug with a reliable degree. There was a high level of patient compliance and good tolerability.
Conclusion. Ergoferon is an effective and safe drug for the prevention of COVID-19 in people vaccinated against a new coronavirus infection.
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Khabatova VV, Serov DA, Tikhonova IV, Astashev ME, Nagaev EI, Sarimov RM, Matveyeva TA, Simakin AV, Gudkov SV. Selenium Nanoparticles Can Influence the Immune Response Due to Interactions with Antibodies and Modulation of the Physiological State of Granulocytes. Pharmaceutics 2022; 14. [PMID: 36559266 DOI: 10.3390/pharmaceutics14122772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/02/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022] Open
Abstract
Currently, selenium nanoparticles (SeNPs) are considered potential immunomodulatory agents and as targets for activity modulation are granulocytes, which have the most abundant population of immune blood cells. The present study aims to evaluate the cytotoxic effect and its effect on the functional responses of granulocytes. In addition to the intrinsic activity of SeNPs, we studied the activity of the combination of SeNPs and IgG antibodies. Using laser ablation and fragmentation, we obtained nanoparticles with an average size of 100 nm and a rather narrow size evolution. The resulting nanoparticles do not show acute toxicity to primary cultures of fibroblasts and hepatocytes, epithelial-like cell line L-929 and granulocyte-like culture of HL-60 at a concentration of 109 NPs/mL. SeNPs at a concentration of 1010 NPs/mL reduced the viability of HL-60 cells by no more than 10% and did not affect the viability of the primary culture of mouse granulocytes, and did not have a genotoxic effect on progenitor cells. The addition of SeNPs can affect the production of reactive oxygen species (ROS) by mouse bone marrow granulocytes, modulate the proportion of granulocytes with calcium spikes and enhance fMLF-induced granulocytes degranulation. SeNPs can modulate the effect of IgG on the physiological responses of granulocytes. We studied the expression level of genes associated with inflammation and cell stress. SeNPs increase the expression of catalase, NF-κB, Xrcc5 and some others; antibodies enhance the effect of SeNPs, but IgG without SeNPs decreases the expression level of these genes. This fact can be explained by the interaction between SeNPs and IgG. It has been established that antibodies interact with SeNPs. We showed that antibodies bind to the surface of selenium nanoparticles and are present in aqueous solutions in a bound form from DLS methods, ultraviolet-visible spectroscopy, vibrational-rotational spectrometry, fluorescence spectrometry, and refractometry. At the same time, in a significant part of the antibodies, a partial change in the tertiary and secondary structure is observed. The data obtained will allow a better understanding of the principles of the interaction of immune cells with antibodies and SeNPs and, in the future, may serve to create a new generation of immunomodulators.
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Basov A, Drobotenko M, Svidlov A, Bezhenar M, Gerasimenko E, Moiseev A, Malyshko V, Dorohova A, Drozdov A, Baryshev M, Dzhimak S. Influence of Single Deuterium Replacement on Frequency of Hydrogen Bond Dissociation in IFNA17 under the Highest Critical Energy Range. Int J Mol Sci 2022; 23. [PMID: 36555136 DOI: 10.3390/ijms232415487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/02/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022] Open
Abstract
The effect of single substitutions of protium for deuterium in hydrogen bonds between pairs of nitrogenous bases on the open states occurrence probability at high critical breaking energies of these bonds has been studied. The study was carried out using numerical methods based on the angular mathematical model of DNA. The IFNA17 gene was divided into three approximately equal parts. A comparison of the open states occurrence probability in these parts of the gene was done. To improve the accuracy of the results, a special data processing algorithm was developed. The developed methods have shown their suitability for taking into account the occurrence of open states in the entire range of high critical energies. It has been established that single 2H/1H substitutions in certain nitrogenous bases can be a mechanism for maintaining the vital activity of IFNA17 under critical conditions. In general, the developed method of the mathematical modeling provide unprecedented insight into the DNA behavior under the highest critical energy range, which greatly expands scientific understanding of nucleobases interaction.
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Bezhenar MV, Elkina AA, Caceres JLH, Baryshev MG, Sulima AO, Dzhimak SS, Isaev VA. Review of Mathematical Models Describing the Mechanical Motion in a DNA Molecule. Biophysics (Nagoya-shi) 2022. [DOI: 10.1134/s0006350922060021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
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14
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Munim NM, Treena TT, Islam MR, Nishat MM. Design and analysis of an ultra-high sensitive and tunable metal-insulator-metal waveguide-coupled octagonal ring resonator utilizing gold nanorods. Sensing and Bio-Sensing Research 2022. [DOI: 10.1016/j.sbsr.2022.100529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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15
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Ashurov MK, Ashurov EM, Astashev ME, Baimler IV, Gudkov SV, Konchekov EM, Lednev VN, Lukina NA, Matveeva TA, Markendudis AG, Onegov AV, Rashidova DK, Sarimov RM, Sergeichev KF, Sharipov ST, Simakin AV, Smirnov IG, Smolentsev SY, Yakubov MM, Yanykin DV, Shcherbakov IA. Development of an Environmentally Friendly Technology for the Treatment of Aqueous Solutions with High-Purity Plasma for the Cultivation of Cotton, Wheat and Strawberries. ChemEngineering 2022; 6:91. [DOI: 10.3390/chemengineering6060091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The microwave setup for obtaining plasma-activated water (PAW) has been created. PAW contains significant concentrations of H2O2 and NO3−, has a reduced content of O2, high conductivity, a high redox potential and low pH. Likewise, the specific electrical conductivity and concentration of H2O2 and NO3− linearly depend on the treatment time. These parameters are simple and convenient markers for controlling the preparation of PAW. It has been established that PAW solutions with a concentration of 0.5–1.0% increase the germination energy, protect against fusarium and hyperthermia in cotton, wheat and strawberry seeds. In addition, PAWs have a positive effect on the growth rate of plants in the early stages of development. The use of PAW provides significant benefits over the chemical preparations Dalbron and Bakhor, so-called seed germination stimulators (SDS).
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Titus AR, Madeira PP, Ferreira LA, Chernyak VY, Uversky VN, Zaslavsky BY. Mechanism of Phase Separation in Aqueous Two-Phase Systems. Int J Mol Sci 2022; 23. [PMID: 36430844 DOI: 10.3390/ijms232214366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
Liquid-liquid phase separation underlies the formation of membrane-less organelles inside living cells. The mechanism of this process can be examined using simple aqueous mixtures of two or more solutes, which are able to phase separate at specific concentration thresholds. This work presents the first experimental evidence that mesoscopic changes precede visually detected macroscopic phase separation in aqueous mixtures of two polymers and a single polymer and salt. Dynamic light scattering (DLS) analysis indicates the formation of mesoscopic polymer agglomerates in these systems. These agglomerates increase in size with increasing polymer concentrations prior to visual phase separation. Such mesoscopic changes are paralleled by changes in water structure as evidenced by Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR) spectroscopic analysis of OH-stretch bands. Through OH-stretch band analysis, we obtain quantitative estimates of the relative fractions of four subpopulations of water structures coexisting in aqueous solutions. These estimates indicate that abrupt changes in hydrogen bond arrangement take place at concentrations below the threshold of macroscopic phase separation. We used these experimental observations to develop a model of phase separation in aqueous media.
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Farrakhova DS, Romanishkin ID, Yakovlev DV, Maklygina YS, Oleinikov VA, Fedotov PV, Kravchik MV, Bezdetnaya L, Loschenov VB. Correlation of spectroscopic and structural properties of indocyanine green j-aggregates. Biomedical photonics 2022; 11:4-16. [DOI: 10.24931/2413-9432-2022-11-3-4-16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Indocyanine green (ICG), when in free form in a liquid, can form stable nanoparticle structures or colloidal solution, while changing its spectroscopic properties. In the work, the aggregation degree and the average size of nanoparticles depending on the concentration of a colloidal solution of indocyanine green (ICG NPs) in the form of J-aggregates were investigated by various methods based on light scattering. The size of nanoparticles is an important parameter from the point of view of clinical application, because the technique of intravenous administration of drugs, in order to avoid microvascular thrombosis and embolism, provides dosage forms with inclusions of individual molecules or their clusters, not exceeding 500 nm diameter. In turn, small nanoparticles less than 30 nm lead to prolonged circulation of the drug in the body with an increased possibility of permeation into cells of healthy tissue. In the course of studies, it was found that an increase in the concentration of ICG NPs in the solution leads to an increase in the average size of spontaneously formed J-aggregates, which, in turn, leads to a decrease in the absorption coefficient in the aggregates. Presumably, this phenomenon, i.e. the established nonlinear dependence of the J-aggregate absorption on its size, can be explained by the formation of absorption centers on the J-aggregate surface in the form of mobile surface molecules. The threshold range of ICG molecule concentration was determined, at which there is a transition from aggregation with an increase in size with a slow addition of ICG J-aggregate molecules in height to a rapid addition in width.
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Serov DA, Baimler IV, Burmistrov DE, Baryshev AS, Yanykin DV, Astashev ME, Simakin AV, Gudkov SV. The Development of New Nanocomposite Polytetrafluoroethylene/Fe 2O 3 NPs to Prevent Bacterial Contamination in Meat Industry. Polymers (Basel) 2022; 14:polym14224880. [PMID: 36433009 PMCID: PMC9695638 DOI: 10.3390/polym14224880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 11/15/2022] Open
Abstract
The bacterial contamination of cutting boards and other equipment in the meat processing industry is one of the key reasons for reducing the shelf life and consumer properties of products. There are two ways to solve this problem. The first option is to create coatings with increased strength in order to prevent the formation of micro damages that are favorable for bacterial growth. The second possibility is to create materials with antimicrobial properties. The use of polytetrafluoroethylene (PTFE) coatings with the addition of metal oxide nanoparticles will allow to the achieving of both strength and bacteriostatic effects at the same time. In the present study, a new coating based on PTFE and Fe2O3 nanoparticles was developed. Fe2O3 nanoparticles were synthesized by laser ablation in water and transferred into acetone using the developed procedures. An acetone-based colloidal solution was mixed with a PTFE-based varnish. Composites with concentrations of Fe2O3 nanoparticles from 0.001-0.1% were synthesized. We studied the effect of the obtained material on the generation of ROS (hydrogen peroxide and hydroxyl radicals), 8-oxoguanine, and long-lived active forms of proteins. It was found that PTFE did not affect the generation of all the studied compounds, and the addition of Fe2O3 nanoparticles increased the generation of H2O2 and hydroxyl radicals by up to 6 and 7 times, respectively. The generation of 8-oxoguanine and long-lived reactive protein species in the presence of PTFE/Fe2O3 NPs at 0.1% increased by 2 and 3 times, respectively. The bacteriostatic and cytotoxic effects of the developed material were studied. PTFE with the addition of Fe2O3 nanoparticles, at a concentration of 0.001% or more, inhibited the growth of E. coli by 2-5 times compared to the control or PTFE without NPs. At the same time, PTFE, even with the addition of 0.1% Fe2O3 nanoparticles, did not significantly impact the survival of eukaryotic cells. It was assumed that the resulting composite material could be used to cover cutting boards and other polymeric surfaces in the meat processing industry.
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Malik S, Kumar S, Biswas A, Yıldırım Y, Moraru L, Moldovanu S, Iticescu C, Alshehri HM. Cubic-Quartic Optical Solitons in Fiber Bragg Gratings with Dispersive Reflectivity Having Parabolic Law of Nonlinear Refractive Index by Lie Symmetry. Symmetry (Basel) 2022; 14:2370. [DOI: 10.3390/sym14112370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This work recovers cubic-quartic optical solitons with dispersive reflectivity in fiber Bragg gratings and parabolic law of nonlinearity. The Lie symmetry analysis first reduces the governing partial differential equations to the corresponding ordinary differential equations which are subsequently integrated. This integration is conducted using two approaches which are the modified Kudryashov’s approach as well as the generalized Arnous’ scheme. These collectively yielded a full spectrum of cubic-quartic optical solitons that have been proposed to control the depletion of the much-needed chromatic dispersion. They range from bright, dark, singular to combo solitons. These solitons are considered with dispersive reflectivity, which maintains the necessary balance between chromatic dispersion and nonlinear refractive index structure for an uninterrupted transmission of solitons along intercontinental distances. Their respective surface and contour plots are also exhibited. A few closing words are included with some prospective future avenues of research to extend this topic further.
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Ivanov YD, Tatur VY, Shumov ID, Kozlov AF, Valueva AA, Ivanova IA, Ershova MO, Ivanova ND, Stepanov IN, Lukyanitsa AA, Ziborov VS. Atomic Force Microscopy Study of the Effect of an Electric Field, Applied to a Pyramidal Structure, on Enzyme Biomolecules. J Funct Biomater 2022; 13:jfb13040234. [PMID: 36412875 PMCID: PMC9680214 DOI: 10.3390/jfb13040234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/31/2022] [Accepted: 11/08/2022] [Indexed: 11/11/2022] Open
Abstract
The influence of an external constant strong electric field, formed using a pyramidal structure under a high electric potential, on an enzyme located near its apex, is studied. Horseradish peroxidase (HRP) is used as a model. In our experiments, a 27 kV direct current (DC) voltage was applied to two electrodes with a conducting pyramidal structure attached to one of them. The enzyme particles were visualized by atomic force microscopy (AFM) after the adsorption of the enzyme from its 0.1 µM solution onto mica AFM substrates. It is demonstrated that after the 40 min exposure to the electric field, the enzyme forms extended structures on mica, while in control experiments compact HRP particles are observed. After the exposure to the electric field, the majority of mica-adsorbed HRP particles had a height of 1.2 nm (as opposed to 1.0 nm in the case of control experiments), and the contribution of higher (>2.0 nm) particles was also considerable. This indicates the formation of high-order HRP aggregates under the influence of an applied electric field. At that, the enzymatic activity of HRP against its substrate 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) remains unaffected. These results are important for studying macroscopic effects of strong electromagnetic fields on enzymes, as well as for the development of cellular structure models.
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Affiliation(s)
- Yuri D. Ivanov
- Institute of Biomedical Chemistry, 119121 Moscow, Russia
- Joint Institute for High Temperatures of the Russian Academy of Sciences, 125412 Moscow, Russia
- Correspondence:
| | - Vadim Y. Tatur
- Foundation of Perspective Technologies and Novations, 115682 Moscow, Russia
| | - Ivan D. Shumov
- Institute of Biomedical Chemistry, 119121 Moscow, Russia
| | | | | | | | | | - Nina D. Ivanova
- Foundation of Perspective Technologies and Novations, 115682 Moscow, Russia
- Moscow State Academy of Veterinary Medicine and Biotechnology Named after Skryabin, 109472 Moscow, Russia
| | - Igor N. Stepanov
- Foundation of Perspective Technologies and Novations, 115682 Moscow, Russia
| | - Andrei A. Lukyanitsa
- Foundation of Perspective Technologies and Novations, 115682 Moscow, Russia
- Faculty of Computational Mathematics and Cybernetics, Moscow State University, 119991 Moscow, Russia
| | - Vadim S. Ziborov
- Institute of Biomedical Chemistry, 119121 Moscow, Russia
- Joint Institute for High Temperatures of the Russian Academy of Sciences, 125412 Moscow, Russia
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21
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Bonyár A, Szalóki M, Borók A, Rigó I, Kámán J, Zangana S, Veres M, Rácz P, Aladi M, Kedves MÁ, Szokol Á, Petrik P, Fogarassy Z, Molnár K, Csete M, Szenes A, Tóth E, Vas D, Papp I, Galbács G, Csernai LP, Biró TS, Kroó N, Collaboration NAPLIFE. The Effect of Femtosecond Laser Irradiation and Plasmon Field on the Degree of Conversion of a UDMA-TEGDMA Copolymer Nanocomposite Doped with Gold Nanorods. Int J Mol Sci 2022; 23:ijms232113575. [PMID: 36362358 PMCID: PMC9657072 DOI: 10.3390/ijms232113575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/26/2022] [Accepted: 11/01/2022] [Indexed: 11/09/2022] Open
Abstract
In this work, the effects of femtosecond laser irradiation and doping with plasmonic gold nanorods on the degree of conversion (DC) of a urethane dimethacrylate (UDMA)–triethylene glycol dimethacrylate (TEGDMA) nanocomposite were investigated. The UDMA-TEGDMA photopolymer was prepared in a 3:1 weight ratio and doped with dodecanethiol- (DDT) capped gold nanorods of 25 × 75 or 25 × 85 nm nominal diameter and length. It was found that the presence of the gold nanorods alone (without direct plasmonic excitation) can increase the DC of the photopolymer by 6–15%. This increase was found to be similar to what could be achieved with a control heat treatment of 30 min at 180 °C. It was also shown that femtosecond laser impulses (795 nm, 5 mJ pulse energy, 50 fs pulse length, 2.83 Jcm−2 fluence), applied after the photopolymerization under a standard dental curing lamp, can cause a 2–7% increase in the DC of undoped samples, even after thermal pre-treatment. The best DC values (12–15% increase) were obtained with combined nanorod doping and subsequent laser irradiation close to the plasmon resonance peak of the nanorods (760–800 nm), which proves that the excited plasmon field can directly facilitate double bond breakage (without thermoplasmonic effects due to the short pulse length) and increase the crosslink density independently from the initial photopolymerization process.
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Affiliation(s)
- Attila Bonyár
- Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University for Economics and Informatics, 1111 Budapest, Hungary
- Correspondence: ; Tel.: +36-(1)-4632758
| | - Melinda Szalóki
- Department of Biomaterials and Prosthetic Dentistry, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary
| | - Alexandra Borók
- Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University for Economics and Informatics, 1111 Budapest, Hungary
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - István Rigó
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Judit Kámán
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Shereen Zangana
- Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University for Economics and Informatics, 1111 Budapest, Hungary
| | - Miklós Veres
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Péter Rácz
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Márk Aladi
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | | | - Ágnes Szokol
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Péter Petrik
- Centre for Energy Research, Institute of Technical Physics and Materials Science (MFA), 1121 Budapest, Hungary
| | - Zsolt Fogarassy
- Centre for Energy Research, Institute of Technical Physics and Materials Science (MFA), 1121 Budapest, Hungary
| | - Kolos Molnár
- Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111 Budapest, Hungary
| | - Mária Csete
- Department of Optics and Quantum Electronics, University of Szeged, 6720 Szeged, Hungary
| | - András Szenes
- Department of Optics and Quantum Electronics, University of Szeged, 6720 Szeged, Hungary
| | - Emese Tóth
- Department of Optics and Quantum Electronics, University of Szeged, 6720 Szeged, Hungary
| | - Dávid Vas
- Department of Optics and Quantum Electronics, University of Szeged, 6720 Szeged, Hungary
| | - István Papp
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Gábor Galbács
- Department of Inorganic and Analytical Chemistry, University of Szeged, 6720 Szeged, Hungary
| | - László P. Csernai
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
- Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway
- Frankfurt Institute for Advanced Studies, 60438 Frankfurt/Main, Germany
| | - Tamás S. Biró
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
| | - Norbert Kroó
- Wigner Research Centre for Physics, 1525 Budapest, Hungary
- Hungarian Academy of Sciences, 1051 Budapest, Hungary
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Maiorov VD, Tarakanova EG, Kislina IS. MECHANISM ACID-BASE INTERACTIONS AND STRUCTURES OF COMPLEXES IN 3,5-DIMETHYLPYRAZOLE SOLUTIONS IN METHANESULFONIC AND TRIFLUOROACETIC ACIDS. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622110208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Lyashchenko AK, Dunyashev VS. Reflection and Radio Brightness of Aqueous Solutions of Alkali Metal Formiates at Millimeter Wavelengths. Russ J Phys Chem 2022. [DOI: 10.1134/s0036024422110164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Volkov AA, Chuchupal SV. Dielectric spectra of liquid water: Ultrabroadband modeling and interpretation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Nagaev EI, Baimler IV, Baryshev AS, Astashev ME, Gudkov SV. Effect of Laser-Induced Optical Breakdown on the Structure of Bsa Molecules in Aqueous Solutions: An Optical Study. Molecules 2022; 27:6752. [PMID: 36235285 DOI: 10.3390/molecules27196752] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/07/2022] [Accepted: 10/08/2022] [Indexed: 12/22/2022] Open
Abstract
The influence of laser radiation of a typical surgical laser on the physicochemical properties of the Bovine Serum Albumin (BSA) protein was studied. It was established that the physicochemical characteristics of optical breakdown weakly depend on the concentration of protein molecules. At the same time, the patterns observed for an aqueous solution of BSA irradiated with a laser for different time periods were extremely similar to the classical ones. It was established that after exposure to laser radiation, the optical density of protein solutions increases. At the same time, the intensity of BSA fluorescence due to aromatic amino acid residues decreases insignificantly after exposure to laser radiation. In this case, the position of the excitation and emission maximum does not change, and the shape of the fluorescence spot on 3D maps also does not change significantly. On the Raman spectrum after exposure to laser radiation, a significant decrease in 1570 cm−1 was observed, which indicates the degradation of α-helices and, as a result, partial denaturation of BSA molecules. Partial denaturation did not significantly change the total area of protein molecules, since the refractive index of solutions did not change significantly. However, in BSA solutions, after exposure to laser radiation, the viscosity increased, and the pseudoplasticity of aqueous solutions decreased. In this case, there was no massive damage to the polypeptide chain; on the contrary, when exposed to optical breakdown, intense aggregation was observed, while aggregates with a size of 400 nm or more appeared in the solution. Thus, under the action of optical breakdown induced by laser radiation in a BSA solution, the processes of partial denaturation and aggregation prevail, aromatic amino acid residues are damaged to a lesser extent, and fragmentation of protein molecules is not observed.
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Maiorov VD, Tarakanova EG, Maiorov AV, Kislina IS. EQUILIBRIUM COMPOSITION AND STRUCTURE OF NANOMOIETIES OF THE TRIETHYLAMINE– METHANSULFONIC ACID SYSTEM. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622100055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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27
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Ivanov YD, Tatur VY, Shumov ID, Kozlov AF, Valueva AA, Ivanova IA, Ershova MO, Ivanova ND, Stepanov IN, Lukyanitsa AA, Ziborov VS. The Effect of a Dodecahedron-Shaped Structure on the Properties of an Enzyme. J Funct Biomater 2022; 13:166. [PMID: 36278635 PMCID: PMC9590084 DOI: 10.3390/jfb13040166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/21/2022] [Accepted: 09/24/2022] [Indexed: 11/26/2022] Open
Abstract
In this research, the influence of a dodecahedron-shaped structure on the adsorption behavior of a horseradish peroxidase (HRP) enzyme glycoprotein onto mica substrates was studied. In the experiments, samples of an aqueous HRP solution were incubated at various distances (0.03 m, 2 m, 5 m, and control at 20 m) from the dodecahedron surface. After the incubation, the direct adsorption of HRP onto mica substrates immersed in the solutions was performed, and the mica-adsorbed HRP particles were visualized via atomic force microscopy (AFM). The effect of the increased HRP aggregation was only observed after the incubation of the enzyme solution at the 2 m distance from the dodecahedron. In addition, with respect to the control sample, spectrophotometric measurements revealed no change in the HRP enzymatic activity after the incubation at any of the distances studied. The results reported herein can be of use in the modeling of the possible influences of various spatial structures on biological objects in the development of biosensors and other electronic equipment.
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Belov SV, Danileiko YK, Egorov AB, Lukanin VI, Semenova AA, Lisitsyn AB, Revutskaya NM, Nasonova VV, Yushina YK, Tolordava ER, Nasyrov NA, Sinichkina AI, Konchekov EM, Matveeva TA, Gudkov SV. Sterilizer of Knives in the Meat Industry, Working by Activating Aqueous Solutions with Glow Discharge Plasma. Processes (Basel) 2022; 10:1536. [DOI: 10.3390/pr10081536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The development of approaches for the non-thermal sterilization of instruments is an urgent task to ensure the safety of meat industry products, where the use of hot water leads to the formation of condensates and a deterioration in the hygienic condition of the premises. In this study, an installation for sterilizing knives was created, which works by activating aqueous salt solutions with a glow discharge. The power consumption of the installation reactor is only 125–150 Wh. The temperature rise of the sterilizing agent used is about 1.1 ± 0.2 °C/min/L. The effectiveness of the installation for plasma-activation of aqueous solutions of chloride and sodium sulfate by glow discharge (PAW) in relation to the inactivation of microorganisms, including Staphylococcus aureus, Salmonella typhimurium, Pseudomonas gessardii and L. monocytogenes, on steel surfaces was evaluated. Samples of stainless steel (parts of knives) were used in two versions (new and artificially aged). Mono- and polyspecies bacterial biofilms were grown on the surface of the samples. The treatment was carried out by immersing samples of steel plates in plasma-activated aqueous solutions. It was found that the treatment of plates in a knife sterilizer for 1 min had an effective effect on the inhibition of all types of studied bacteria.
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Tsarkova LA, Gurkov TD. Volatile surfactants: Characterization and areas of application. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Říha A, Jelínková H, Doroshenko ME, Jelínek M, Šulc J, Němec M, Vyhlídal D, Kovalenko NO. Mid-Infrared Laser Generation of Zn1-xMnxSe and Zn1-xMgxSe (x ≈ 0.3) Single Crystals Co-Doped by Cr2 and Fe2 Ions—Comparison of Different Excitation Wavelengths++. Materials 2022; 15:5277. [PMID: 35955211 PMCID: PMC9369922 DOI: 10.3390/ma15155277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/22/2022] [Accepted: 07/27/2022] [Indexed: 02/04/2023]
Abstract
Two different mid-infrared (mid-IR) solid-state crystalline laser active media of Cr2+, Fe2+:Zn1−xMnxSe and Cr2+, Fe2+:Zn1−xMgxSe with similar amounts of manganese or magnesium ions of x ≈ 0.3 were investigated at cryogenic temperatures for three different excitation wavelengths: Q-switched Er:YLF laser at the wavelength of 1.73 μm, Q-switched Er:YAG laser at 2.94 μm, and the gain-switched Fe:ZnSe laser operated at a liquid nitrogen temperature of 78 K at ∼4.05 μm. The temperature dependence of spectral and laser characteristics was measured. Depending on the excitation wavelength and the selected output coupler, both laser systems were able to generate radiation by Cr2+ or by Fe2+ ions under direct excitation or indirectly by the Cr2+→ Fe2+ energy transfer mechanism. Laser generation of Fe2+ ions in Cr2+, Fe2+:Zn1−xMnxSe and Cr2+, Fe2+:Zn1−xMgxSe (x ≈ 0.3) crystals at the wavelengths of ∼4.4 and ∼4.8 μm at a temperature of 78 K was achieved, respectively. The excitation of Fe2+ ions in both samples by direct 2.94 μm as well as ∼4.05 μm radiation or indirectly via the Cr2+→ Fe2+ ions’ energy transfer-based mechanism by 1.73 μm radiation was demonstrated. Based on the obtained results, the possibility of developing novel coherent laser systems in mid-IR regions (∼2.3–2.5 and ∼4.4–4.9 μm) based on AIIBVI matrices was presented.
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Murota K, Saito T. Pore size effects on surface charges and interfacial electrostatics of mesoporous silicas. Phys Chem Chem Phys 2022; 24:18073-18082. [PMID: 35876621 DOI: 10.1039/d2cp02520e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water in confinement becomes more structured than bulk water, and its properties, such as the dielectric constant, change. It remains unclear, however, how the interfacial reactions in confinement, such as the adsorption of ions on the surfaces of small pores, differ from those in larger spaces. We focused on the deprotonation reaction of hydroxyl groups, a fundamental surface reaction, and investigated the dependence of the surface charge density on pore size by determining the surface charge densities of six types of mesoporous silicas with micropores and mesopores at different ionic strengths and pH levels from batch titration tests. The surface complexation model assuming a potential distribution based on the Poisson-Boltzmann equation in cylindrical coordinates was fitted to the obtained surface charge densities to relate the electrostatics near the surface to the surface reaction. The results showed that the absolute values of the surface charge densities decreased with decreasing pore diameter due to the overlap of the electrical double layers. Furthermore, the capacitance of the Stern layer optimized by fitting decreased with decreasing pore diameter, especially in pores smaller than 4 nm in diameter, which suggested that the dielectric constants of water decreased near the surfaces of small pores.
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Affiliation(s)
- Kento Murota
- Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. .,Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority, 1-9-9 Roppongi, Minato-ku, Tokyo 106-8450, Japan
| | - Takumi Saito
- Nuclear Professional School, School of Engineering, The University of Tokyo, 2-22 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1188, Japan
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Gudkov SV, Astashev ME, Baimler IV, Uvarov OV, Voronov VV, Simakin AV. Laser-Induced Optical Breakdown of an Aqueous Colloidal Solution Containing Terbium Nanoparticles: The Effect of Oxidation of Nanoparticles. J Phys Chem B 2022; 126:5678-5688. [PMID: 35878998 DOI: 10.1021/acs.jpcb.2c02089] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The influence of the number of oxidized terbium nanoparticles on the intensity of physicochemical processes occurring during optical breakdown in aqueous colloidal solutions of nanoparticles has been studied. It is shown that the effect of the number of oxidized terbium nanoparticles on the physicochemical processes occurring during optical breakdown depends significantly on the fluence of laser radiation. At a fluence of less than 100-110 J/cm2, plasma formation processes occur more intensively on less-oxidized (metal) nanoparticles. At a fluence of more than 100-110 J/cm2, the processes of plasma formation during optical breakdown occur much more intensively on more-oxidized nanoparticles. It has been established that the dependence of the rate of laser-induced decomposition of water on the concentration of nanoparticles is two-phase. The rate of generation of water decomposition products increases with an increase in the concentration of nanoparticles up to 109 NP/mL. With a further increase in the concentration of nanoparticles, the rate of generation of water decomposition products decreases. In this case, more than 99% of the decomposition products of water are formed due to the action of plasma, and the share of ultraviolet and ultrasound formed during optical breakdown is approximately 0.5% on each.
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Affiliation(s)
- Sergey V Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
| | - Maxim E Astashev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
| | - Ilya V Baimler
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
| | - Oleg V Uvarov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
| | - Valery V Voronov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
| | - Alexander V Simakin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova Street, Moscow 119991, Russia
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Gudkov SV, Burmistrov DE, Lednev VN, Simakin AV, Uvarov OV, Kucherov RN, Ivashkin PI, Dorokhov AS, Izmailov AY. Biosafety Construction Composite Based on Iron Oxide Nanoparticles and PLGA. Inventions 2022; 7:61. [DOI: 10.3390/inventions7030061] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Nanocomposites based on polymers and nanoparticles are used in agriculture for photoconversion of solar radiation, as a basis for covering material, as a packaging material, and as functional films. At the same time, nanocomposites are almost never used in agriculture as biosafe structural materials. In this work, we have developed a technology for obtaining a nanocomposite based on PLGA and iron oxide nanoparticles. The nanocomposite has unique physical and chemical properties and also exhibits pronounced antibacterial properties at a concentration of iron oxide nanoparticles of more than 0.01%. At the same time, the nanocomposite does not affect the growth and development of pepper and is biocompatible with mammalian cells. Nanocomposites based on PLGA and iron oxide nanoparticles can be an attractive candidate for the manufacture of structural and packaging materials in agriculture.
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Gabyshev DN, Szakáll M, Shcherbakov DV, Fedorets AA, Dyachkov SM. Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity. Atmosphere 2022; 13:1137. [DOI: 10.3390/atmos13071137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This paper aims to study the path oscillations of single, spherical water droplets levitated in a wind tunnel to better comprehend the mechanical motion of small raindrops. The observations were carried out in the Mainz vertical wind tunnel. The discrete, fast Fourier transform was used to determine the oscillatory frequencies of the droplet paths, and the Hilbert transform was applied to analyze their instantaneous frequency stability. Both transversal and streamwise components of the path oscillations are described with typical frequencies of several tens of Hertz. The studied oscillations elongate the paths, reduce the terminal velocity of the smallest droplets, and make the rain droplet fall in a non-uniform motion even after reaching terminal velocity. The terminal velocity can be considered as physically having been reached if our proposed practical criterion is satisfied. From a fluid mechanics perspective, the paper fills an experimental gap in the studies of the paths oscillations of single, liquid spheres of microscopic sizes at low Bond numbers <1 and relatively low Reynolds numbers ~102.
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Kaniyala Melanthota S, Kistenev YV, Borisova E, Ivanov D, Zakharova O, Boyko A, Vrazhnov D, Gopal D, Chakrabarti S, K SP, Mazumder N. Types of spectroscopy and microscopy techniques for cancer diagnosis: a review. Lasers Med Sci 2022; 37:3067-3084. [PMID: 35834141 PMCID: PMC9525344 DOI: 10.1007/s10103-022-03610-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 07/05/2022] [Indexed: 11/25/2022]
Abstract
Cancer is a life-threatening disease that has claimed the lives of many people worldwide. With the current diagnostic methods, it is hard to determine cancer at an early stage, due to its versatile nature and lack of genomic biomarkers. The rapid development of biophotonics has emerged as a potential tool in cancer detection and diagnosis. Using the fluorescence, scattering, and absorption characteristics of cells and tissues, it is possible to detect cancer at an early stage. The diagnostic techniques addressed in this review are highly sensitive to the chemical and morphological changes in the cell and tissue during disease progression. These changes alter the fluorescence signal of the cell/tissue and are detected using spectroscopy and microscopy techniques including confocal and two-photon fluorescence (TPF). Further, second harmonic generation (SHG) microscopy reveals the morphological changes that occurred in non-centrosymmetric structures in the tissue, such as collagen. Again, Raman spectroscopy is a non-destructive method that provides a fingerprinting technique to differentiate benign and malignant tissue based on Raman signal. Photoacoustic microscopy and spectroscopy of tissue allow molecule-specific detection with high spatial resolution and penetration depth. In addition, terahertz spectroscopic studies reveal the variation of tissue water content during disease progression. In this review, we address the applications of spectroscopic and microscopic techniques for cancer detection based on the optical properties of the tissue. The discussed state-of-the-art techniques successfully determines malignancy to its rapid diagnosis.
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Affiliation(s)
- Sindhoora Kaniyala Melanthota
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Karnataka, 576104, Manipal, India
| | - Yury V Kistenev
- Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050, Russia
- Central Research Laboratory, Siberian State Medical University, Tomsk, 634050, Russia
| | - Ekaterina Borisova
- Laboratory of Biophotonics, Institute of Electronics, Bulgarian Academy of Sciences, Tsarigradsko Chaussee Blvd, 72, 1784, Sofia, Bulgaria.
- Biology Faculty, Saratov State University, 83, Astrakhanskaya Str, 410012, Saratov, Russia.
| | - Deyan Ivanov
- Laboratory of Biophotonics, Institute of Electronics, Bulgarian Academy of Sciences, Tsarigradsko Chaussee Blvd, 72, 1784, Sofia, Bulgaria
| | - Olga Zakharova
- Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050, Russia
| | - Andrey Boyko
- Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050, Russia
| | - Denis Vrazhnov
- Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050, Russia
| | - Dharshini Gopal
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Karnataka, 576104, Manipal, India
| | - Shweta Chakrabarti
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Karnataka, 576104, Manipal, India
| | - Shama Prasada K
- Department of Cell and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Karnataka, 576104, Manipal, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Karnataka, 576104, Manipal, India.
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Długosz O, Banach M. Synthesis of metalloporphyrin complexes based on chlorophyllin. J Mol Struct 2022; 1260:132841. [DOI: 10.1016/j.molstruc.2022.132841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Elsheikh N, Nistor I, Azimi AH, Mohammadian A. Tsunami-Induced Bore Propagating over a Canal—Part 1: Laboratory Experiments and Numerical Validation. Fluids 2022; 7:213. [DOI: 10.3390/fluids7070213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This companion paper investigates the hydrodynamics of turbulent bores that propagate on a horizontal plane and have a striking resemblance to dam break waves and tsunami-like hydraulic bores. The focus of this paper is on the propagation of a turbulent bore over a mitigation canal using both laboratory experiments and numerical simulations. In the first part of this paper, the effects of canal depth on the time histories of wave height and velocity were experimentally investigated, and the experimental results were used for the validation of the numerical model. The rapid release of water from an impoundment reservoir at depths of do = 0.30 m and 0.40 m generated bores analogous to tsunami-induced inundations. The time histories of the wave heights and velocities were measured at 0.2 m upstream and at 0.2 m and 0.58 m downstream of the canal to study the energy dissipation effect of the mitigation canal. The recorded time series of the water surface levels and velocities were compared with simulation outputs, and good agreement was found between the experimental and numerical water surface profiles, with a Root Mean Square Error (RMSE) of less than 6.7% and a relative error of less than 8.4%. Three turbulence models, including the standard k-ε, Realizable k-ε, and RNG k-ε, were tested, and it was found that all these models performed well, with the standard k-ε model providing the highest accuracy. The velocity contour plots of the mitigation canal with different depths showed jet streams of different sizes in the shallow, medium-depth, and deep canals. The energy dissipation and air bubble entrainment of the bore as it plunged downward into the canal increased as the canal depth increased, and the jet stream of the maximum bore velocity decreased as the canal depth increased. It was found that the eye of the vortex created by the bore in the canal moved in the downstream direction and plunged downward in the middle of the canal, where it then began to separate into two smaller vortices.
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Seo J, Ryu Y, Chung J. Simulation Study of Radio Frequency Safety and the Optimal Size of a Single-Channel Surface Radio Frequency Coil for Mice at 9.4 T Magnetic Resonance Imaging. Sensors 2022; 22:4274. [PMID: 35684895 PMCID: PMC9185248 DOI: 10.3390/s22114274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/22/2022] [Accepted: 06/01/2022] [Indexed: 12/04/2022]
Abstract
The optimized size of a single-channel surface radio frequency (RF) coil for mouse body images in a 9.4 T magnetic resonance imaging (MRI) system was determined via electromagnetic-field analysis of the signal depth according to the size of a single-channel coil. The single-channel surface RF coils used in electromagnetic field simulations were configured to operate in transmission/reception mode at a frequency of 9.4 T–400 MHz. Computational analysis using the finite-difference time-domain method was used to assess the single-channel surface RF coil by comparing single-channel surface RF coils of varying sizes in terms of |B1|-, |B1+|-, |B1−|- and |E|-field distribution. RF safety for the prevention of burn injuries to small animals was assessed using an analysis of the specific absorption rate. A single-channel surface RF coil with a 20 mm diameter provided optimal B1-field distribution and RF safety, thus confirming that single-channel surface RF coils with ≥25 mm diameter could not provide typical B1-field distribution. A single-channel surface RF coil with a 20 mm diameter for mouse body imaging at 9.4 T MRI was recommended to preserve the characteristics of single-channel surface RF coils, and ensured that RF signals were applied correctly to the target point within RF safety guidelines.
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Abstract
In this article, the new iterative transform method is applied to evaluate the time-fractional Cahn–Allen model solution. In this technique, Elzaki transformation is a mixture of the new iteration technique. Two problems are studied to demonstrate and confirm the accuracy of the proposed technique. The current technique’s mathematical analysis showed that the method is simple to understand and reliable. These solutions indicate that the proposed technique is advantageous and simple to apply in science and engineering problems.
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Karmanova EE, Chernikov AV, Ivanov VE, Usacheva AM, Bruskov VI. Antioxidant and Genoprotective Properties of α-Lipoic (Thioctic) Acid in Blood Serum Under X-Ray Exposure. Pharm Chem J. [DOI: 10.1007/s11094-022-02641-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Wen Z, Zhang Z, Zhang K, Li J, Shi H, Li M, Hou Y, Xue M, Zhang Z. Large-Scale Wideband Light-Trapping Black Silicon Textured by Laser Inducing Assisted with Laser Cleaning in Ambient Air. Nanomaterials (Basel) 2022; 12:1772. [PMID: 35630993 PMCID: PMC9142894 DOI: 10.3390/nano12101772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 02/06/2023]
Abstract
Black silicon, which is an attractive material due to its optical properties, is prepared mainly by laser inducing in an SF6 atmosphere. Considering the effect of SF6 gas on the environment and human health, here we propose an efficient, economical, and green approach to process large-scale black silicon. In the wavelength range of 0.3-2.5 µm, the role of air could replace SF6 gas to texture black silicon by laser inducing with appropriate processing parameters. Then, to extend the working window of its excellent light-trapping status, laser-plasma shockwave cleaning was introduced to eliminate the deposition and improve the structures and morphology. The results revealed that the micro-nano structures became higher, denser, and more uniform with increasing cleaning times and deteriorating cleaning velocity, which compensated for the role of S atoms from the ambient SF6. Moreover, absorptance above 85% in the wavelength range of 0.3-15 µm was realized using our method. The effect of scanning pitch between adjacent rows on large-scale black silicon was also discussed. Our method realized the ultrahigh absorptance of large-scale black silicon fabricated in air from visible to mid-infrared, which is of significance in the field of optoelectronic devices.
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Affiliation(s)
- Zhidong Wen
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
- School of Integrated Circuits, University of Chinese Academy of Sciences, No. 19 (A) Yuquan Road, Beijing 100049, China
| | - Zhe Zhang
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
- School of Integrated Circuits, University of Chinese Academy of Sciences, No. 19 (A) Yuquan Road, Beijing 100049, China
| | - Kunpeng Zhang
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
| | - Jiafa Li
- Focal Plane Division, The 11th Research Institute of China Electronics Technology Corporation, Beijing 100846, China;
| | - Haiyan Shi
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
| | - Man Li
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
| | - Yu Hou
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
| | - Mei Xue
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
| | - Zichen Zhang
- Microelectronics Instruments and Equipment R & D Center, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China; (Z.W.); (Z.Z.); (K.Z.); (H.S.); (M.L.); (M.X.)
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Shishkina AV, Ksenofontov AA, Penkov NV, Vener MV. Diclofenac Ion Hydration: Experimental and Theoretical Search for Anion Pairs. Molecules 2022; 27:3350. [PMID: 35630826 DOI: 10.3390/molecules27103350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 05/15/2022] [Accepted: 05/17/2022] [Indexed: 11/21/2022] Open
Abstract
Self-assembly of organic ions in aqueous solutions is a hot topic at the present time, and substances that are well-soluble in water are usually studied. In this work, aqueous solutions of sodium diclofenac are investigated, which, like most medicinal compounds, is poorly soluble in water. Classical MD modeling of an aqueous solution of diclofenac sodium showed equilibrium between the hydrated anion and the hydrated dimer of the diclofenac anion. The assignment and interpretation of the bands in the UV, NIR, and IR spectra are based on DFT calculations in the discrete-continuum approximation. It has been shown that the combined use of spectroscopic methods in various frequency ranges with classical MD simulations and DFT calculations provides valuable information on the association processes of medical compounds in aqueous solutions. Additionally, such a combined application of experimental and calculation methods allowed us to put forward a hypothesis about the mechanism of the effect of diclofenac sodium in high dilutions on a solution of diclofenac sodium.
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Konchekov EM, Kolik LV, Danilejko YK, Belov SV, Artem’ev KV, Astashev ME, Pavlik TI, Lukanin VI, Kutyrev AI, Smirnov IG, Gudkov SV. Enhancement of the Plant Grafting Technique with Dielectric Barrier Discharge Cold Atmospheric Plasma and Plasma-Treated Solution. Plants 2022; 11:plants11101373. [PMID: 35631800 PMCID: PMC9146419 DOI: 10.3390/plants11101373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 11/16/2022]
Abstract
A garden plant grafting technique enhanced by cold plasma (CAP) and plasma-treated solutions (PTS) is described for the first time. It has been shown that CAP created by a dielectric barrier discharge (DBD) and PTS makes it possible to increase the growth of Pyrus communis L. by 35–44%, and the diameter of the root collar by 10–28%. In this case, the electrical resistivity of the graft decreased by 20–48%, which indicated the formation of a more developed vascular system at the rootstock–scion interface. The characteristics of DBD CAP and PTS are described in detail.
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Affiliation(s)
- Evgeny M. Konchekov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
- Correspondence:
| | - Leonid V. Kolik
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Yury K. Danilejko
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Sergey V. Belov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Konstantin V. Artem’ev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Maxim E. Astashev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Tatiana I. Pavlik
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Vladimir I. Lukanin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
| | - Alexey I. Kutyrev
- Federal Scientific Agroengineering Center VIM, 109428 Moscow, Russia; (A.I.K.); (I.G.S.)
| | - Igor G. Smirnov
- Federal Scientific Agroengineering Center VIM, 109428 Moscow, Russia; (A.I.K.); (I.G.S.)
| | - Sergey V. Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; (L.V.K.); (Y.K.D.); (S.V.B.); (K.V.A.); (M.E.A.); (T.I.P.); (V.I.L.); (S.V.G.)
- Federal Scientific Agroengineering Center VIM, 109428 Moscow, Russia; (A.I.K.); (I.G.S.)
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Petrova NV, Tarasov SA, Epstein OI, Dubroca C, Sulpice T. Highly Diluted Antibodies to eNOS Restore Endothelium Function in Aortic Rings From Hypertensive Rats. Dose Response 2022; 20:15593258221099281. [PMID: 35602582 PMCID: PMC9118459 DOI: 10.1177/15593258221099281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 04/20/2022] [Indexed: 11/17/2022]
Abstract
Background Nitric oxide (NO) as a vaso- and cardio-protective agent could reduce vasomotor dysfunction in different cardiovascular diseases. One of the current therapeutics targeted at NO availability in the vascular wall are highly diluted antibodies to endothelial NO-synthase (eNOS). This drug has previously shown its endothelium-protective effect and effectiveness in reducing hypertension. Current study was dedicated to evaluate the direct impact of highly diluted antibodies to eNOS on the vessel constriction and dilation ex vivo. Methods For that purpose, we used thoracic aortas dissected from spontaneously hypertensive (SHR) rats. Endothelium-dependent relaxation in the presence of highly diluted antibodies to eNOS (1 mL) was examined after phenylephrine-induced pre-constriction of the aorta rings in response to gradually increased acetylcholine concentration (1 nM to 10 µM). Results Highly diluted antibodies to eNOS enhanced acetylcholine-induced relaxation in a statistically significant manner. Moreover, it was demonstrated that observed effect was similar to perindopril, a well-known angiotensin-converting-enzyme inhibitor, which works through relaxing and widening blood vessels. Conclusions Our findings indicate that highly diluted antibodies to eNOS restored impaired endothelium function, as demonstrated by increased relaxation of SHR rats aorta rings. The revealed results suggest beneficial effect of highly diluted antibodies to eNOS to ameliorate hypertension and related diseases.
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Affiliation(s)
- Nataliya V. Petrova
- FSBSI Institute of General Pathology and Pathophysiology, Moscow, Russia
- OOO “NPF “MATERIA MEDICA HOLDING”, Moscow, Russia
| | - Sergey A. Tarasov
- FSBSI Institute of General Pathology and Pathophysiology, Moscow, Russia
- OOO “NPF “MATERIA MEDICA HOLDING”, Moscow, Russia
| | - Oleg I. Epstein
- FSBSI Institute of General Pathology and Pathophysiology, Moscow, Russia
- OOO “NPF “MATERIA MEDICA HOLDING”, Moscow, Russia
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Izmailov A, Khort D, Filippov R, Pishchalnikov RY, Simakin AV, Shogenov Y. Improvement of Winter Graft Techniques Using Cold Plasma and Plasma-Treated Solution on Cherry Cultures. Applied Sciences 2022; 12:4953. [DOI: 10.3390/app12104953] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The description of a new method of winter grafting of sweet cherry varieties “Revna” is given. The novelty of the method lies in the use of a portable device for generating cold plasma, as well as a plasma-treated solution, developed by the team of authors. It has been established that exposure to cold plasma affects the growth length of “Revna” cherries by 17–28%, while an increase in the diameter of the root collar by 20–23% was observed. The electrical resistivity in the grafting zone after exposure to plasma or plasma-activated water decreased by an average of 14% compared to the control, which indicated a better fusion of the transport fibers of the rootstocks and scions.
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Ninham B, Reines B, Battye M, Thomas P. Pulmonary surfactant and COVID-19: A new synthesis. QRB Discov 2022; 3:e6. [PMID: 37564950 PMCID: PMC10411325 DOI: 10.1017/qrd.2022.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 03/24/2022] [Accepted: 04/05/2022] [Indexed: 11/06/2022] Open
Abstract
Chapter 1 COVID-19 pathogenesis poses paradoxes difficult to explain with traditional physiology. For instance, since type II pneumocytes are considered the primary cellular target of SARS-CoV-2; as these produce pulmonary surfactant (PS), the possibility that insufficient PS plays a role in COVID-19 pathogenesis has been raised. However, the opposite of predicted high alveolar surface tension is found in many early COVID-19 patients: paradoxically normal lung volumes and high compliance occur, with profound hypoxemia. That 'COVID anomaly' was quickly rationalised by invoking traditional vascular mechanisms-mainly because of surprisingly preserved alveolar surface in early hypoxemic cases. However, that quick rejection of alveolar damage only occurred because the actual mechanism of gas exchange has long been presumed to be non-problematic, due to diffusion through the alveolar surface. On the contrary, we provide physical chemical evidence that gas exchange occurs by an process of expansion and contraction of the three-dimensional structures of PS and its associated proteins. This view explains anomalous observations from the level of cryo-TEM to whole individuals. It encompasses results from premature infants to the deepest diving seals. Once understood, the COVID anomaly dissolves and is straightforwardly explained as covert viral damage to the 3D structure of PS, with direct treatment implications. As a natural experiment, the SARS-CoV-2 virus itself has helped us to simplify and clarify not only the nature of dyspnea and its relationship to pulmonary compliance, but also the fine detail of the PS including such features as water channels which had heretofore been entirely unexpected. Chapter 2 For a long time, physical, colloid and surface chemistry have not intersected with physiology and cell biology as much as we might have hoped. The reasons are starting to become clear. The discipline of physical chemistry suffered from serious unrecognised omissions that rendered it ineffective. These foundational defects included omission of specific ion molecular forces and hydration effects. The discipline lacked a predictive theory of self-assembly of lipids and proteins. Worse, theory omitted any role for dissolved gases, O2, N2, CO2, and their existence as stable nanobubbles above physiological salt concentration. Recent developments have gone some way to explaining the foam-like lung surfactant structures and function. It delivers O2/N2 as nanobubbles, and efflux of CO2, and H2O nanobubbles at the alveolar surface. Knowledge of pulmonary surfactant structure allows an explanation of the mechanism of corona virus entry, and differences in infectivity of different variants. CO2 nanobubbles, resulting from metabolism passing through the molecular frit provided by the glycocalyx of venous tissue, forms the previously unexplained foam which is the endothelial surface layer. CO2 nanobubbles turn out to be lethal to viruses, providing a plausible explanation for the origin of 'Long COVID'. Circulating nanobubbles, stable above physiological 0.17 M salt drive various enzyme-like activities and chemical reactions. Awareness of the microstructure of Pulmonary Surfactant and that nanobubbles of (O2/N2) and CO2 are integral to respiratory and circulatory physiology provides new insights to the COVID-19 and other pathogen activity.
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Affiliation(s)
- Barry Ninham
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
- School of Science, University of New South Wales, Northcott Drive, Campbell, Canberra, ACT2612, Australia
| | - Brandon Reines
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
- Department of Biomedical Informatics, University of Pittsburgh School of Medicine, 5607 Baum Blvd, Pittsburgh, PA15206, USA
| | | | - Paul Thomas
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
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Kononov M, Molkova E, Pustovoy V, Svetikov V. The Use of Plasmonic Spectroscopy for Detecting Ultra-Low Concentrations of Substances. Photonics 2022; 9:281. [DOI: 10.3390/photonics9050281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This paper presents the results of research into the excitation of a surface electromagnetic wave (SEW) in Au/AgI and Au/Ag films contacting aqueous solutions of hydrogen peroxide (H2O2) and sodium chloride (NaCl). The dependences of the SEW excitation angle in the Kretschmann configuration on the interaction time of the solution with the metal film have been obtained. The effect of an aqueous H2O2 solution on the AgI and Ag film under prolonged exposure has been demonstrated. It has been shown that the dynamics of the excitation angle can be used to estimate the concentration of solutions with low and ultra-low concentrations. As an example, the results of using the technique for the analysis of aqueous solutions of NaCl are presented.
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Dzhimak S, Svidlov A, Elkina A, Gerasimenko E, Baryshev M, Drobotenko M. Genesis of Open States Zones in a DNA Molecule Depends on the Localization and Value of the Torque. Int J Mol Sci 2022; 23:ijms23084428. [PMID: 35457247 PMCID: PMC9025193 DOI: 10.3390/ijms23084428] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 03/31/2022] [Accepted: 04/15/2022] [Indexed: 11/24/2022] Open
Abstract
The formation and dynamics of the open states in a double-stranded DNA molecule are largely determined by its mechanical parameters. The main one is the torque. However, the experimental study of DNA dynamics and the occurrence of open states is limited by the spatial resolution of available biophysical instruments. Therefore, in this work, on the basis of a mechanical mathematical model of DNA, calculations of the torque effect on the process of occurrence and dynamics of open states were carried out for the interferon alpha 17 gene. It was shown that torsion action leads to the occurrence of rotational movements of nitrogenous bases. This influence is nonlinear, and an increase in the amplitude of the torsion action does not lead to an automatic increase in the amplitude of rotational movements and an increase in the zones’ open states. Calculations with a constant torsion moment demonstrate that open states zones are more often formed at the boundaries of the gen and in regions with a predominance of A–T pairs. It is shown, that for the occurrence of open states in the part of the gene that contains a small number of A–T pairs, a large amount of torque is required. When the torque is applied to a certain region of the gene, the probability of the formation of the open state depends on the content of A–T pairs in this region, the size of this region, and on the exposure time. For this mathematical model, open states zones can be closed when the torsion action stops. The simulation results showed that the values of the torsion moment required for the appearance of open states zones, in some cases, are close to experimentally measured (13–15 pN·nm).
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Affiliation(s)
- Stepan Dzhimak
- Department of Radiophysics and Nanothechnology, Physics Faculty, Kuban State University, 350040 Krasnodar, Russia; (A.S.); (A.E.); (M.B.); (M.D.)
- Laboratory of Problems of Stable Isotope Spreading in Living Systems, Federal Research Center the Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
- Correspondence: ; Tel.: +7-905-408-36-12
| | - Alexandr Svidlov
- Department of Radiophysics and Nanothechnology, Physics Faculty, Kuban State University, 350040 Krasnodar, Russia; (A.S.); (A.E.); (M.B.); (M.D.)
- Laboratory of Problems of Stable Isotope Spreading in Living Systems, Federal Research Center the Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
| | - Anna Elkina
- Department of Radiophysics and Nanothechnology, Physics Faculty, Kuban State University, 350040 Krasnodar, Russia; (A.S.); (A.E.); (M.B.); (M.D.)
- Laboratory of Problems of Stable Isotope Spreading in Living Systems, Federal Research Center the Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
| | - Eugeny Gerasimenko
- Department of Technology of Fats, Cosmetics, Commodity Science, Processes and Devices, Kuban State Technological University, 350072 Krasnodar, Russia;
| | - Mikhail Baryshev
- Department of Radiophysics and Nanothechnology, Physics Faculty, Kuban State University, 350040 Krasnodar, Russia; (A.S.); (A.E.); (M.B.); (M.D.)
- Laboratory of Problems of Stable Isotope Spreading in Living Systems, Federal Research Center the Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
- Department of Technology of Fats, Cosmetics, Commodity Science, Processes and Devices, Kuban State Technological University, 350072 Krasnodar, Russia;
| | - Mikhail Drobotenko
- Department of Radiophysics and Nanothechnology, Physics Faculty, Kuban State University, 350040 Krasnodar, Russia; (A.S.); (A.E.); (M.B.); (M.D.)
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Ivanov YD, Malsagova KA, Bukharina NS, Vesnin SG, Usanov SA, Tatur VY, Lukyanitsa AA, Ivanova ND, Konev VA, Ziborov VS. Radiothermometric Study of the Effect of Amino Acid Mutation on the Characteristics of the Enzymatic System. Diagnostics (Basel) 2022; 12:diagnostics12040943. [PMID: 35453991 PMCID: PMC9024681 DOI: 10.3390/diagnostics12040943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/05/2022] [Accepted: 04/08/2022] [Indexed: 11/16/2022] Open
Abstract
The radiothermometry (RTM) study of a cytochrome-containing system (CYP102 A1) has been conducted in order to demonstrate the applicability of RTM for monitoring changes in the functional activity of an enzyme in case of its point mutation. The study has been performed with the example of the wild-type cytochrome (WT) and its mutant type A264K. CYP102 A1 is a nanoscale protein-enzymatic system of about 10 nm in size. RTM uses a radio detector and can record the corresponding brightness temperature (Tbr) of the nanoscale enzyme solution within the 3.4–4.2 GHz frequency range during enzyme functioning. It was found that the enzymatic reaction during the lauric acid hydroxylation at the wild-type CYP102 A1 (WT) concentration of ~10−9 M is accompanied by Tbr fluctuations of ~0.5–1 °C. At the same time, no Tbr fluctuations are observed for the mutated forms of the enzyme CYP102 A1 (A264K), where one amino acid was replaced. We know that the activity of CYP102 A1 (WT) is ~4 orders of magnitude higher than that of CYP102 A1 (A264K). We therefore concluded that the disappearance of the fluctuation of Tbr CYP102 A1 (A264K) is associated with a decrease in the activity of the enzyme. This effect can be used to develop new methods for testing the activity of the enzyme that do not require additional labels and expensive equipment, in comparison with calorimetry and spectral methods. The RTM is beginning to find application in the diagnosis of oncological diseases and for the analysis of biochemical processes.
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Affiliation(s)
- Yuri D. Ivanov
- Laboratory of Nanobiotechnology, Institute of Biomedical Chemistry, Pogodinskaya St. 10 Build. 8, 119121 Moscow, Russia; (N.S.B.); (V.S.Z.)
- Laboratory of Shock Wave Impacts, Joint Institute for High Temperatures of Russian Academy of Sciences, Izhorskaya St. 13 Build. 2, 125412 Moscow, Russia
- Correspondence: (Y.D.I.); (K.A.M.); Tel.: +7-(499)-246-37-61 (Y.D.I.)
| | - Kristina A. Malsagova
- Laboratory of Nanobiotechnology, Institute of Biomedical Chemistry, Pogodinskaya St. 10 Build. 8, 119121 Moscow, Russia; (N.S.B.); (V.S.Z.)
- Correspondence: (Y.D.I.); (K.A.M.); Tel.: +7-(499)-246-37-61 (Y.D.I.)
| | - Natalia S. Bukharina
- Laboratory of Nanobiotechnology, Institute of Biomedical Chemistry, Pogodinskaya St. 10 Build. 8, 119121 Moscow, Russia; (N.S.B.); (V.S.Z.)
| | | | - Sergey A. Usanov
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Academician V.F. Kuprevich 5 Build. 2, 220141 Minsk, Belarus;
| | - Vadim Yu. Tatur
- Foundation of Perspective Technologies and Novations, Shipilovskaya St. 64, 115682 Moscow, Russia; (V.Y.T.); (A.A.L.)
| | - Andrei A. Lukyanitsa
- Foundation of Perspective Technologies and Novations, Shipilovskaya St. 64, 115682 Moscow, Russia; (V.Y.T.); (A.A.L.)
| | - Nina D. Ivanova
- Skryabin Moscow State Academy of Veterinary Medicine and Biotechnology, Academician Skryabin St. 23, 109472 Moscow, Russia;
| | - Vladimir A. Konev
- Department of Infectious Diseases in Children, Faculty of Pediatrics, Pirogov Russian National Research Medical University, Ostrovityanov St. 1, 117997 Moscow, Russia;
| | - Vadim S. Ziborov
- Laboratory of Nanobiotechnology, Institute of Biomedical Chemistry, Pogodinskaya St. 10 Build. 8, 119121 Moscow, Russia; (N.S.B.); (V.S.Z.)
- Laboratory of Shock Wave Impacts, Joint Institute for High Temperatures of Russian Academy of Sciences, Izhorskaya St. 13 Build. 2, 125412 Moscow, Russia
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Ninham BW, Bolotskova PN, Gudkov SV, Baranova EN, Kozlov VA, Shkirin AV, Vu MT, Bunkin NF. Nafion Swelling in Salt Solutions in a Finite Sized Cell: Curious Phenomena Dependent on Sample Preparation Protocol. Polymers (Basel) 2022; 14:1511. [PMID: 35458261 PMCID: PMC9027590 DOI: 10.3390/polym14081511] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 03/31/2022] [Accepted: 04/02/2022] [Indexed: 02/04/2023] Open
Abstract
When a membrane of Nafion swells in water, polymer fibers “unwind” into the adjoining liquid. They extend to a maximum of about ~300 μm. We explore features of Nafion nanostructure in several electrolyte solutions that occur when the swelling is constrained to a cell of size less than a distance of 300 μm. The constraint forces the polymer fibers to abut against the cell windows. The strongly amphiphilic character of the polymer leads to a shear stress field and the expulsion of water from the complex swollen fiber mixture. An air cavity is formed. It is known that Nafion membrane swelling is highly sensitive to small changes in ion concentration and exposure to shaking. Here we probe such changes further by studying the dynamics of the collapse of the induced cavity. Deionized water and aqueous salt solutions were investigated with Fourier IR spectrometry. The characteristic times of collapse differ for water and for the salt solutions. The dynamics of the cavity collapse differs for solutions prepared by via different dilution protocols. These results are surprising. They may have implications for the standardization of pharmaceutical preparation processes.
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