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Influence of 10-(6-plastoquinonyl) decyltriphenylphosphonium on free-radical homeostasis in the heart and blood serum of rats with streptozotocin-induced hyperglycemia

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World Journal of Diabetes 2019年第12期10卷 546-559页

作者： aleksander a agarkov Tatyana N Popova Yana G Boltysheva Department of Medical Biochemistry and Microbiology Voronezh State University

BACKGROUND It is known that under conditions of tissue tolerance to insulin,observed during type 2 diabetes mellitus(DM2),there is an increased production of reactive oxygen ***,the free radicals can initiate lipid peroxidation(LPO)in lipoprotein *** concentration of LPO products can influence the state of insulin receptors,repressing their hormone connection activity,which is expressed as a reduction of the glucose consumption by *** is possible that reduction in glucose concentration during administration of 10-(6-plastoquinonyl)decyltriphenylphosphonium(SkQ1)to rats with DM2 may be related to the antioxidant properties of this *** To establish the influence of SkQ1 on free-radical homeostasis in the heart and blood serum of rats with streptozotocin-induced *** To induce hyperglycemia,rats were fed a high-fat diet for 1 mo and then administered two intra-abdominal injections of streptozotocin with a 7-d interval at a 30 mg/kg of animal weight dose with citrate buffer equal to pH ***1 solution was administered intraperitoneally at a 1250 nmol/kg dose per *** samples were taken from control animals,animals with experimental hyperglycemia,rats with streptozotocin-induced glycemia that were administered SkQ1 solution,animals housed under standard vivarium conditions that were administered SkQ1,rats that were administered intraperitoneally citrate buffer equal to pH 4.4 once a week during 2 wk after 1-mo high-fat diet,and animals that were administered intraperitoneally with appropriate amount of solution without SkQ1(98%ethanol diluted eight times with normal saline solution).To determine the intensity of free radical oxidation and total antioxidant activity,we used the biochemiluminescence *** hydratase(AH),superoxide dismutase,and catalase activities were estimated using the Hitachi U-1900 spectrophotometer supplied with *** amount of citrate was determined by means of the Natel

关键词： Diabetes mellitus Free radical oxidation Antioxidants 10-(6-plastoquinonyl)decyltriphenylphosphonium

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Reconstruction of Postinfarcted Cardiac Functions Through Injection of Tanshinone ⅡA@Reactive Oxygen Species-Sensitive Microspheres Encapsulated in a Thermoreversible Hydrogel

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Energy & Environmental Materials 2024年第2期7卷 187-199页

作者： Ling Yu Yubin Liang Lei Gao Peipei Chen Zhiqiang Yu Minzhou Zhang aleksander Hinek Shuai Mao Second Clinical College Guangzhou University of Chinese MedicineGuangzhou 510120China Department of Critical Care Medicine Guangdong Provincial Hospital of Chinese MedicineGuangzhou 510120China Guangdong Provincial Branch of National Clinical Research Centre for Chinese Medicine Cardiology Guangzhou 510120China Department of Radiation Medicine and Applied Sciences University of California San DiegoLa JollaCalifornia 92093USA Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523018China Translational Medicine Hospital for Sick ChildrenToronto M5G 0A4Canada

Myocardial damage resulting from acute myocardial infarction often leads to progressive heart failure and sudden death,highlighting the urgent clinical need for effective ***,tanshinoneⅡA has been identified as a promising therapeutic agent for myocardial ***,efficient delivery remains a major issue that limits clinical *** address this problem,an injectable thermosensitive poly(lactic acid-co-glycolic acid)-block-poly(ethylene glycol)-block-poly(lactic acid-co-glycolic acid)gel(PLGA-PEG-PLGA)system encapsulating tanshinoneⅡA-loaded reactive oxygen species-sensitive microspheres(Gel-MS/tanshinoneⅡA)has been designed and synthesized in this *** thermosensitive hydrogel exhibits good mechanical properties after reaching body *** initially immobilized by the gel exhibit excellent reactive oxygen species-triggered release properties in a high-reactive oxygen species environment after myocardial infarction *** a result,encapsulated tanshinoneⅡA is effectively released into the infarcted myocardium,where it exerts local anti-pyroptotic and anti-inflammatory ***,the combined advantages of this technique contribute to the mitigation of left ventricular remodeling and the restoration of cardiac function following tanshinoneⅡ***,this novel,precision-guided intra-tissue therapeutic system allows for customized local release of tanshinoneⅡA,presenting a promising alternative treatment strategy aimed at inducing beneficial ventricular remodeling in the post-infarct heart.

关键词： myocardial infarction ROS-sensitive polymer tanshinoneⅡA thermoreversible hydrogel ventricular remodeling

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Frequency drift rate of solar decameter"drift pair"bursts

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Research in Astronomy and Astrophysics 2017年第9期17卷 101-110页

作者： aleksander Stanislavsky aleksander Konovalenko Yaroslav Volvach Institute of Radio Astronomy Kharkiv 61002Ukraine V.N.Karazin Kharkiv National University Kharkiv 61002Ukraine

This paper deals with the detailed analysis of frequency drift rates of solar ＂drift pair＂（DP） bursts observed from 2015 July 10 to 12 during a type III burst storm. The observations were conducted by the UTR-2 radio telescope at 9-33 MHz with high frequency and time resolution. DPs were recorded drifting from higher to lower frequencies （forward DPs） as well as from lower to higher ones （reverse DPs）. Patterns on their dynamic spectrum had various inclines and occupied different bandwidths. The frequency drift rate versus frequency dependence of these bursts has been studied. The fitting model to describe the peak evolution of these bursts in the frequency-time plane is presented. The relationship between DPs and type III solar bursts is discussed.

关键词： Sun: corona -- Sun radio radiation -- methods observational -- techniques spectroscopic

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Some Results Connected with the Class Number Problem in Real Quadratic Fields

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Acta Mathematica Sinica,English Series 2005年第5期21卷 1107-1112页

作者： aleksander GRYTCZUK Jaroslaw GRYTCZUK Faculty of Mathematics.Computer Science and Econometrics University of Zielona Gora.65 516 Zielona Gora.Poland Institute

We investigate arithmetic properties of certain subsets of square-free positive integers and obtain in this way some results concerning the class number h（d） of the real quadratic field Q（√d）. In particular, we give a new proof of the result of Hasse, asserting that in this case h（d） = 1 is possible only if d is of the form p, 2q or qr. where p.q. r are primes and q≡r≡3（mod 4）.

关键词： The class number Real quadratic field

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Numerical modelling of the hybrid rocket engine performance

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Propulsion and Power Research 2021年第1期10卷 15-22页

作者： Marian Gieras aleksander Gorgeri a Institute of Heat Engineering Warsaw University of TechnologyWarsaw00-665Poland Łukasiewicz Research Network e Institute of Aviation Warsaw02-256Poland

The purpose of this paper is to present method of the numerical modeling of the hybrid rocket engine's work as a tool for designing engines of this *** model is intended as an accurate and simple to use development tool for use in preliminary design stages of hybrid rocket engines,improving the effectiveness and quality of this *** assumptions underlying the use of a model are presented,together with an analysis of past work in this *** of an extensive experimental campaign are presented and compared with the results of numerical modelling in order to calibrate the proposed model and evaluate its ***eter variation and optimization were conducted,proving functionality of the ***sented numerical calculations show that the adopted approach to reduce the analysis time and complexity was *** method of numerical calculation of hybrid engine working parameters combines aspects of accuracy and simplicity at the early design stage to avoid timeconsuming and costly changes in subsequent detailed stages of design.

关键词： Hybrid rocket engine Combustion Multi-phase flow Regression Specific impulse

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Sperm chromatin structure assay （SCSA）： a tool in diagnosis and treatment of infertility

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Asian Journal of Andrology 2011年第1期13卷 69-75页

作者： Mona Bungum Leif Bungum aleksander Giwercman Reproductive Medicine Centre （RMC） Skane University Hospital SE - 205 02 Maimo Sweden

Diagnosis of male infertility has mainly been based on the World Health Organization （WHO） manual-based semen parameter＇s concentration, motility and morphology. It has, however, become apparent that none of these parameters are reliable markers for evaluation of the fertility potential of a couple. A search for better markers has led to an increased focus on sperm chromatin integrity testing in fertility work-up and assisted reproductive techniques. During the last couple of decades, numerous sperm DNA integrity tests have been developed. These are claimed to be characterized by a lower intraindividual variation, less intralaboratory and interlaboratory variation and thus less subjective than the conventional sperm analysis. However, not all the sperm chromatin integrity tests have yet been shown to be of clinical value. So far, the test that has been found to have the most stable clinical threshold values in relation to fertility is the sperm chromatin structure assay （SCSA）, a flow cytometric test that measures the susceptibility of sperm DNA to acid-induced DNA denaturation in situ. Sperm DNA fragmentation as measured by SCSA has shown to be an independent predictor of successful pregnancy in first pregnancy planners as well as in couples undergoing intrauterine insemination, and can be used as a tool in investigation, counseling and treatment of involuntary childlessness. More conflicting data exist regarding the role of sperm DNA fragmentation in relation to fertilization, pre-embryo development and pregnancy outcome in in vitro fertilization and intracytoplasmic sperm injection （ICSI）.

关键词： assisted reproductive techniques infertility sperm chromatin structure assay sperm DNA

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Environmental xenobiotics and male reproductive health

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Asian Journal of Andrology 2014年第1期16卷 3-4页

作者： Jens Peter Bonde aleksander Giwercman Department of Occupational and Environmental Medicine Frederiksberg and Bispebjerg Hospital University of Copenhagen Denmark Reproductive Medicine Centre Skne University Hospital Maim6 Sweden.

Lessons from the occupational arena fdemonstrate the potential of industrial 4chemicals to damage human testicular function. An important but still unresolved question is whether low-level xenobiotic exposure of the general population poses a hazard. In this volume of the Asian Journal of Andrology, this issue is addressed by a series of reviews on xenobiotic exposure profiles, possible biological mechanisms, research methods and knowledge on impact of specific exposures. Interdisciplinary research fields as gene-environment interaction and male-mediated developmental toxicity is also addressed. Papers are cross-linked by answers to questions mutually put forward by the authors.

关键词： xenobiotics chemicals occupational

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Tailoring electrical conductivity of two dimensional nanomaterials using plasma for edge electronics: A mini review

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 427-443页

作者： Aswathy Vasudevan Vasyl Shvalya aleksander Zidansek Uros Cvelbar Jozef Stefan Institute 1000 LjubljanaSlovenia Jozef Stefan International Postgraduate School 1000 LjubljanaSlovenia Faculty of Natural Sciences and Mathematics University of Maribor2000 MariborSlovenia

Since graphene has been discovered, twodimensional nanomaterials have attracted attention due to their promising tunable electronic properties. The possibility of tailoring electrical conductivity at the atomic level allows creating new prospective 2D structures for energy harvesting and sensing-related applications. In this respect, one of the most successful way to manipulate the physical properties of the aforementioned materials is related to the surface modification techniques employing plasma. Moreover, plasma-gaseous chemical treatment can provide a controlled change in the bandgap, increase sensitivity and significantly improve the structural stability of material to the environment as well. This review deals with recent advances in the modification of 2D carbon nanostructures for novel ‘edge’ electronics using plasma technology and processes.

关键词： graphene edge electronics 2D nanomaterials plasma electrical conductivity

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Fatal meningococcal meningitis in a 2-year-old child:A case report

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World Journal of Clinical Cases 2019年第5期7卷 636-641页

作者： aleksander Mularski Czesław Żaba Department of Legal and Forensic Medicine Poznan University of Medical Sciences Institute of Forensic Research

BACKGROUND In fatal cases of meningococcal septicemia, bacteriological diagnosis may not be straightforward due to postmortem replication and relocation of endogenic microflora. In medicolegal practice, aside from routine autopsy and histopathology, also other diagnostic methods, such as microbiological tests,immunohistochemistry and polymerase chain reaction(PCR), are used to examine body fluids and *** SUMMARY We present the case of sudden death in a 2-year-old child. The patient died approximately 30 min after hospital admission before any routine diagnostic procedures were undertaken. Presence of whole-body rash and fulminant course of the disease raised suspicion of meningococcal septicemia. An autopsy was performed seven days after death when the body showed the signs of late postmortem decomposition. No etiological factor of septicemia could be identified based on macro-and microscopic findings. However, PCR demonstrated the presence of genetic material of group W Neisseria meningitidis in patient's cerebrospinal fluid and *** Microbiological PCR should be conducted postmortem whenever a specific etiological factor could not be identified with conventional methods.

关键词： Meningococcal infection Molecular microbiology Waterhouse-Friderichsen syndrome Neisseria meningitidis Autopsy Cerebrospinal fluid Case report

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Sperm DNA damage in men from infertile couples

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Asian Journal of Andrology 2008年第5期10卷 786-790页

作者： Juris Erenpreiss Saad Elzanaty aleksander Giwercman Andrology Laboratory Riga Stradins University LV-1007 Riga Latvia Reproductive Medicine Centre Scanian Andrology Centre Malmo University Hospital Malmo SE 205 02 Sweden Department of General Surgery Urology Section Kristianstad Central Hospital Kristianstad SE 291 85 Sweden

Aim： To investigate the prevalence of high levels of sperm DNA damage among men from infertile couples with both normal and abnormal standard semen parameters. Methods： A total of 350 men from infertile couples were assessed. Standard semen analysis and sperm chromatin structure assay （SCSA） were carried out. Results： Ninety-seven men （28% of the whole study group） had a DNA fragmentation index （DFI）〉 20%, and 43 men （12%） had a DFI 〉 30%. In the group of men with abnormal semen parameters （n = 224）, 35% had a DFI 〉 20%, and 16% had a DFI 〉 30%, whereas these numbers were 15% and 5%, respectively, in the group of men with normal semen parameters （n = 126）. Men with low sperm motility and abnormal morphology had significantly higher odds ratios （ORs） for having a DFI 〉 20% （4.0 for motility and 1.9 for morphology） and DFI 〉 30% （6.2 for motility and 2.8 for morphology） compared with men with normal sperm motility and morphology. Conclusion： In almost one-third of unselected men from infertile couples, the DFI exceeded the level of 20% above which, according to previous studies, the in vivo fertility is reduced. A significant proportion of men with otherwise normal semen parameters also had high sperm DNA damage levels. Thus, the SCSA test could add to explaining causes of infertility in cases where semen analysis has not shown any deviation from the norm. We also recommend running the SCSA test to choose the appropriate assisted reproductive technique （ART）.

关键词： infertility sperm DNA damage sperm chromatin structure assay semen quality

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