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Rudysh MY, Ftomyn NY, Shchepanskyi PA, Myronchuk GL, Popov AI, Lemée N, Stadnyk VY, Brik MG, Piasecki M. Electronic Structure, Optical, and Elastic Properties of AgGaS
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Crystal: Theoretical Study. Advcd Theory and Sims 2022. [DOI: 10.1002/adts.202200247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- M. Ya. Rudysh
- Faculty of Science and Technology J. Dlugosz University 13/15 Armii Krajowej Al. Czestochowa PL‐42‐201 Poland
- Ivan Franko National University of Lviv 19 Dragomanov Street Lviv 79005 Ukraine
- Faculty of Information Systems Physics and Mathematics Lesya Ukrainka Eastern European National University 9 Potapova Str. Lutsk UA‐43021 Ukraine
- Department of General Physics Lviv Politechnic National University 12 Bandery Str. Lviv UA‐79013 Ukraine
| | - N. Y. Ftomyn
- Ivan Franko National University of Lviv 19 Dragomanov Street Lviv 79005 Ukraine
| | - P. A. Shchepanskyi
- Faculty of Science and Technology J. Dlugosz University 13/15 Armii Krajowej Al. Czestochowa PL‐42‐201 Poland
- Ivan Franko National University of Lviv 19 Dragomanov Street Lviv 79005 Ukraine
- Department of General Physics Lviv Politechnic National University 12 Bandery Str. Lviv UA‐79013 Ukraine
| | - G. L. Myronchuk
- Faculty of Information Systems Physics and Mathematics Lesya Ukrainka Eastern European National University 9 Potapova Str. Lutsk UA‐43021 Ukraine
| | - A. I. Popov
- Institute of Solid‐State Physics University of Latvia Riga LV 1063 Latvia
| | - N. Lemée
- Laboratoire de Physique de la Matière Condensée UR 2081 University of Picardie Jules Verne Amiens 80039 France
| | - V. Y. Stadnyk
- Ivan Franko National University of Lviv 19 Dragomanov Street Lviv 79005 Ukraine
| | - M. G. Brik
- Faculty of Science and Technology J. Dlugosz University 13/15 Armii Krajowej Al. Czestochowa PL‐42‐201 Poland
- CQUPT‐BUL Innovation Institute & College of Sciences Chongqing University of Posts and Telecommunications Chongqing 400065 China
- Institute of Physics University of Tartu W. Ostwald Str 1 Tartu 50411 Estonia
- Academy of Romanian Scientists Ilfov Str. No. 3 Bucharest 050044 Romania
| | - M. Piasecki
- Faculty of Science and Technology J. Dlugosz University 13/15 Armii Krajowej Al. Czestochowa PL‐42‐201 Poland
- Inorganic Chemistry Department Uzhhorod National University 46 Pidhirna Uzhhorod 88000 Ukraine
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Piasecki M, Parasyuk OV, Pavlyuk V, Khyzhun OY, Kityk IV, Myronchuk GL, Wojciechowski KT, Levkovets SI, Piskach LV, Fedorchuk AO, Fochuk PM, Wood V, Yarema M. Searching for better X-ray and γ-ray photodetectors: structure-composition properties of the TlPb 2Br 5-x I x quaternary system. Mater Adv 2022; 3:4006-4014. [PMID: 35663247 PMCID: PMC9092351 DOI: 10.1039/d1ma01259b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 03/22/2022] [Indexed: 06/15/2023]
Abstract
Developing X-ray and γ-ray detectors with stable operation at ambient temperature and high energy resolution is an open challenge. Here, we present an approach to search for new detector materials, combining binary photodetector compounds. More specifically, we explore quaternary TlPb2Br5-x I x compositions, relying on materials synergy between TlBr, TlI, and PbI2 photodetectors. We discover a broad solid solution in the TlPb2Br5-'TlPb2I5' section, which can be derived from a new quaternary compound, TlPb2BrI4, by partial substitution of Br by I atoms on the 4c site or by replacement of I by Br atoms on the 16l site. We carry out a thorough crystallographic analysis of the new TlPb2BrI4 compound and prepare a high-quality standardized structure file. We also complete the phase diagram of the TlPb2Br5-'TlPb2I5' section, based on 21 alloys. Furthermore, we synthesize a series of high quality centimeter-sized TlPb2Br5-x I x single crystals (x = 2, 2.5, 3, 3.5, 4, 4.5) by the Bridgman-Stockbarger method and study their structure and properties using a combination of experimental techniques (X-ray diffraction, X-ray photoelectron spectroscopy, and absorption spectroscopy) and theoretical calculations.
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Affiliation(s)
- M Piasecki
- J.Dlugosz University Częstochowa Armii Krajowej 13/15 Częstochowa Poland
- Inorganic Chemistry Department, Uzhhorod National University 46 Pidhirna Uzhhorod Ukraine
| | - O V Parasyuk
- Department of Inorganic and Physical Chemistry, Eastern European National University Voli Ave. 13, Lutsk Ukraine
| | - V Pavlyuk
- J.Dlugosz University Częstochowa Armii Krajowej 13/15 Częstochowa Poland
- Department of Inorganic Chemistry, Ivan Franko National University Kyryla i Mefodiya Str. 6 Lviv Ukraine
| | - O Y Khyzhun
- Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3 Krzhyzhanivsky St. Kyiv Ukraine
| | - I V Kityk
- Electrical Engineering Department, Czestochowa University Technology Armii Krajowej 17 Czestochowa Poland
- Department of Experimental Physics and Information-Measuring Technology, Lesya Ukrainka Eastern European National University 13 Voli Avenue, Lutsk Ukraine
| | - G L Myronchuk
- Department of Experimental Physics and Information-Measuring Technology, Lesya Ukrainka Eastern European National University 13 Voli Avenue, Lutsk Ukraine
| | - K T Wojciechowski
- Thermoelectric Research Laboratory, Department of Inorganic Chemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology 30 Mickiewicza Avenue Krakow Poland
| | - S I Levkovets
- Department of Inorganic and Physical Chemistry, Eastern European National University Voli Ave. 13, Lutsk Ukraine
| | - L V Piskach
- Department of Inorganic and Physical Chemistry, Eastern European National University Voli Ave. 13, Lutsk Ukraine
| | - A O Fedorchuk
- Department of Inorganic and Organic Chemistry, Lviv National University of Veterinary Medicine and Biotechnologies Pekarska St. 50 Lviv Ukraine
| | - P M Fochuk
- Yuriy Fed'kovych Chernivtsi National University 2 Kotziubynskoho St. Chernivtsi Ukraine
| | - V Wood
- Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich Gloriastrasse 35 Zurich Switzerland
| | - M Yarema
- Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich Gloriastrasse 35 Zurich Switzerland
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Andriyevsky B, Barchiy IE, Studenyak IP, Kashuba AI, Piasecki M. Electron, phonon and thermoelectric properties of Cu 7PS 6 crystal calculated at DFT level. Sci Rep 2021; 11:19065. [PMID: 34561499 PMCID: PMC8463705 DOI: 10.1038/s41598-021-98515-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 07/18/2021] [Accepted: 09/07/2021] [Indexed: 12/05/2022] Open
Abstract
The promising class of the environment-friendly thermoelectrics is the copper-based argyrodite-type ion-conducting crystals exhibiting just extraordinary low thermal conductivity below the glass limit associated with the molten copper sublattice leading to a softening of phonon modes. To explain why the argyrodite structure containing copper ions favors the low thermal conductivity, we have utilized the ab initio calculations of the electron, phonon, and thermoelectric properties of Cu7PS6 crystal in the framework of the density functional and Boltzmann transport theories. To obtain the reliable thermoelectric properties of Cu7PS6, we take into account the dependence of the electron effective mass m* on the redundant carrier concentration n. We propose to use the Burstein–Moss effect for the calculation of the electron effective mass m* of a semiconductor. We have found the strong nonlinear character of copper atom vibrations in Cu7PS6 which exceeds substantially the similar values for phosphorous and sulfur atoms. The large vibration nonlinearity of the copper atoms found in Cu7PS6 explains the diffusion-like heat transfer and the relatively low coefficient of the lattice thermal conductivity (κ = 0.7 W/(m K)), which is favorable to achieve the large thermoelectric figure of merit.
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Affiliation(s)
- B Andriyevsky
- Faculty of Electronics and Computer Sciences, Koszalin University of Technology, Śniadeckich str. 2, 75453, Koszalin, Poland.
| | - I E Barchiy
- Inorganic Chemistry Department, Uzhhorod National University, Pidhirna str. 46, Uzhhorod, 88000, Ukraine
| | - I P Studenyak
- Inorganic Chemistry Department, Uzhhorod National University, Pidhirna str. 46, Uzhhorod, 88000, Ukraine
| | - A I Kashuba
- Department of General Physics, Lviv Polytechnic National University, Bandera str. 12, Lviv, 79013, Ukraine
| | - M Piasecki
- Institute of Physics, Jan Dlugosz University of Częstochowa, Armii Krajowej str. 13/15, Czestochowa, Poland.
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Vu TV, Lavrentyev A, Gabrelian B, Vo DD, Sabov V, Sabov M, Barchiy I, Piasecki M, Khyzhun O. Highly anisotropic layered selenophosphate AgSbP2Se6: The electronic structure and optical properties by experimental measurements and first-principles calculations. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110813] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Piasecki M, Ireland A, Piasecki J, Degens H, Stashuk DW, Swiecicka A, Rutter MK, Jones DA, McPhee JS. Long-Term Endurance and Power Training May Facilitate Motor Unit Size Expansion to Compensate for Declining Motor Unit Numbers in Older Age. Front Physiol 2019; 10:449. [PMID: 31080415 PMCID: PMC6497749 DOI: 10.3389/fphys.2019.00449] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 04/01/2019] [Indexed: 11/15/2022] Open
Abstract
The evidence concerning the effects of exercise in older age on motor unit (MU) numbers, muscle fiber denervation and reinnervation cycles is inconclusive and it remains unknown whether any effects are dependent on the type of exercise undertaken or are localized to highly used muscles. MU characteristics of the vastus lateralis (VL) were assessed using surface and intramuscular electromyography in eighty-five participants, divided into sub groups based on age (young, old) and athletic discipline (control, endurance, power). In a separate study of the biceps brachii (BB), the same characteristics were compared in the favored and non-favored arms in eleven masters tennis players. Muscle size was assessed using MRI and ultrasound. In the VL, the CSA was greater in young compared to old, and power athletes had the largest CSA within their age groups. Motor unit potential (MUP) size was larger in all old compared to young (p < 0.001), with interaction contrasts showing this age-related difference was greater for endurance and power athletes than controls, and MUP size was greater in old athletes compared to old controls. In the BB, thickness did not differ between favored and non-favored arms (p = 0.575), but MUP size was larger in the favored arm (p < 0.001). Long-term athletic training does not prevent age-related loss of muscle size in the VL or BB, regardless of athletic discipline, but may facilitate more successful axonal sprouting and reinnervation of denervated fibers. These effects may be localized to muscles most involved in the exercise.
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Affiliation(s)
- M. Piasecki
- Clinical, Metabolic and Molecular Physiology, MRC-ARUK Centre for Musculoskeletal Ageing Research, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
| | - A. Ireland
- School of Healthcare Science, Manchester Metropolitan University, Manchester, United Kingdom
| | - J. Piasecki
- Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement Research Centre, School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom
| | - H. Degens
- School of Healthcare Science, Manchester Metropolitan University, Manchester, United Kingdom
- Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania
| | - D. W. Stashuk
- Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada
| | - A. Swiecicka
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
| | - M. K. Rutter
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
- Manchester Diabetes Centre, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, United Kingdom
| | - D. A. Jones
- School of Healthcare Science, Manchester Metropolitan University, Manchester, United Kingdom
| | - J. S. McPhee
- Department of Sport and Exercise Sciences, Musculoskeletal Science and Sports Medicine Research Centre, Manchester Metropolitan University, Manchester, United Kingdom
- Department of Physiology, University of Padova, Padova, Italy
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Wilkinson D, Piasecki M, Atherton P. The age-related loss of skeletal muscle mass and function: Measurement and physiology of muscle fibre atrophy and muscle fibre loss in humans. Ageing Res Rev 2018; 47:123-132. [PMID: 30048806 PMCID: PMC6202460 DOI: 10.1016/j.arr.2018.07.005] [Citation(s) in RCA: 335] [Impact Index Per Article: 55.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/20/2018] [Accepted: 07/18/2018] [Indexed: 12/11/2022]
Abstract
Loss of muscle mass with age is due to atrophy and loss of individual muscle fibres. Anabolic resistance is fundamental in age-related fibre atrophy. Fibre loss is associated with denervation and remodelling of motor units. The plasticity of both factors should be considered in future research.
Age-related loss of skeletal muscle mass and function, sarcopenia, is associated with physical frailty and increased risk of morbidity (chronic diseases), in addition to all-cause mortality. The loss of muscle mass occurs incipiently from middle-age (∼1%/year), and in severe instances can lead to a loss of ∼50% by the 8–9th decade of life. This review will focus on muscle deterioration with ageing and highlight the two underpinning mechanisms regulating declines in muscle mass and function: muscle fibre atrophy and muscle fibre loss (hypoplasia) – and their measurement. The mechanisms of muscle fibre atrophy in humans relate to imbalances in muscle protein synthesis (MPS) and breakdown (MPB); however, since there is limited evidence for basal alterations in muscle protein turnover, it would appear that “anabolic resistance” to fundamental environmental cues regulating diurnal muscle homeostasis (namely physical activity and nutrition), underlie age-related catabolic perturbations in muscle proteostasis. While the ‘upstream’ drivers of the desensitization of aged muscle to anabolic stimuli are poorly defined, they most likely relate to impaired efficiency of the conversion of nutritional/exercise stimuli into signalling impacting mRNA translation and proteolysis. Additionally, loss of muscle fibres has been shown in cadaveric studies using anatomical fibre counts, and from iEMG studies demonstrating motor unit loss, albeit with few molecular investigations of this in humans. We suggest that defining countermeasures against sarcopenia requires improved understandings of the co-ordinated regulation of muscle fibre atrophy and fibre loss, which are likely to be inextricably linked.
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Barchii IE, Tovt VA, Piasecki M, Fedorchuk AA, Solomon AM, Pogodin AI. Physicochemical Interaction in the TlInSe2–TlInP2Se6 System. RUSS J INORG CHEM+ 2018. [DOI: 10.1134/s0036023618040034] [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: 11/22/2022]
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Piasecki M, Ireland A, Piasecki J, Stashuk DW, Swiecicka A, Rutter MK, Jones DA, McPhee JS. Failure to expand the motor unit size to compensate for declining motor unit numbers distinguishes sarcopenic from non-sarcopenic older men. J Physiol 2018. [PMID: 29527694 PMCID: PMC5924831 DOI: 10.1113/jp275520] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Key points The age‐related loss of muscle mass is related to the loss of innervating motor neurons and denervation of muscle fibres. Not all denervated muscle fibres are degraded; some may be reinnervated by an adjacent surviving neuron, which expands the innervating motor unit proportional to the numbers of fibres rescued. Enlarged motor units have larger motor unit potentials when measured using electrophysiological techniques. We recorded much larger motor unit potentials in relatively healthy older men compared to young men, but the older men with the smallest muscles (sarcopenia) had smaller motor unit potentials than healthy older men. These findings suggest that healthy older men reinnervate large numbers of muscle fibres to compensate for declining motor neuron numbers, but a failure to do so contributes to muscle loss in sarcopenic men.
Abstract Sarcopenia results from the progressive loss of skeletal muscle mass and reduced function in older age. It is likely to be associated with the well‐documented reduction of motor unit numbers innervating limb muscles and the increase in size of surviving motor units via reinnervation of denervated fibres. However, no evidence exists to confirm the extent of motor unit remodelling in sarcopenic individuals. The aim of the present study was to compare motor unit size and number between young (n = 48), non‐sarcopenic old (n = 13), pre‐sarcopenic (n = 53) and sarcopenic (n = 29) men. Motor unit potentials (MUPs) were isolated from intramuscular and surface EMG recordings. The motor unit numbers were reduced in all groups of old compared with young men (all P < 0.001). MUPs were higher in non‐sarcopenic and pre‐sarcopenic men compared with young men (P = 0.039 and 0.001 respectively), but not in the vastus lateralis of sarcopenic old (P = 0.485). The results suggest that extensive motor unit remodelling occurs relatively early during ageing, exceeds the loss of muscle mass and precedes sarcopenia. Reinnervation of denervated muscle fibres probably expands the motor unit size in the non‐sarcopenic and pre‐sarcopenic old, but not in the sarcopenic old. These findings suggest that a failure to expand the motor unit size distinguishes sarcopenic from pre‐sarcopenic muscles. The age‐related loss of muscle mass is related to the loss of innervating motor neurons and denervation of muscle fibres. Not all denervated muscle fibres are degraded; some may be reinnervated by an adjacent surviving neuron, which expands the innervating motor unit proportional to the numbers of fibres rescued. Enlarged motor units have larger motor unit potentials when measured using electrophysiological techniques. We recorded much larger motor unit potentials in relatively healthy older men compared to young men, but the older men with the smallest muscles (sarcopenia) had smaller motor unit potentials than healthy older men. These findings suggest that healthy older men reinnervate large numbers of muscle fibres to compensate for declining motor neuron numbers, but a failure to do so contributes to muscle loss in sarcopenic men.
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Affiliation(s)
- M Piasecki
- School of Healthcare Science, Manchester Metropolitan University, Manchester, M15GD, UK
| | - A Ireland
- School of Healthcare Science, Manchester Metropolitan University, Manchester, M15GD, UK
| | - J Piasecki
- School of Healthcare Science, Manchester Metropolitan University, Manchester, M15GD, UK
| | - D W Stashuk
- Department of Systems Design Engineering, University of Waterloo, Ontario, N2L 3G1, Canada
| | - A Swiecicka
- Andrology Research Unit, Cardiovascular, Metabolic and Nutritional Sciences Domain, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - M K Rutter
- Andrology Research Unit, Cardiovascular, Metabolic and Nutritional Sciences Domain, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Manchester Diabetes Centre, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - D A Jones
- School of Healthcare Science, Manchester Metropolitan University, Manchester, M15GD, UK
| | - J S McPhee
- School of Healthcare Science, Manchester Metropolitan University, Manchester, M15GD, UK
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Piasecki J, Ireland A, Piasecki M, Cameron J, McPhee JS, Degens H. The strength of weight-bearing bones is similar in amenorrheic and eumenorrheic elite long-distance runners. Scand J Med Sci Sports 2018; 28:1559-1568. [DOI: 10.1111/sms.13062] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2018] [Indexed: 01/25/2023]
Affiliation(s)
- J. Piasecki
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
| | - A. Ireland
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
| | - M. Piasecki
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
| | - J. Cameron
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
| | - J. S. McPhee
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
| | - H. Degens
- School of Healthcare Science; Manchester Metropolitan University; Manchester UK
- Institute of Sport Science and Innovations; Lithuanian Sports University; Kaunas Lithuania
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Piasecki J, McPhee JS, Hannam K, Deere KC, Elhakeem A, Piasecki M, Degens H, Tobias JH, Ireland A. Hip and spine bone mineral density are greater in master sprinters, but not endurance runners compared with non-athletic controls. Arch Osteoporos 2018; 13:72. [PMID: 29971503 PMCID: PMC6028830 DOI: 10.1007/s11657-018-0486-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/05/2018] [Indexed: 02/03/2023]
Abstract
UNLABELLED We examined bone density in older athletes and controls. Sprinters had greater hip and spine bone density than endurance athletes and controls, whereas values were similar in the latter two groups. These results could not be explained by differences in impact, muscle size or power between sprint and endurance athletes. PURPOSE We examined the relationship between prolonged participation in regular sprint or endurance running and skeletal health at key clinical sites in older age, and the factors responsible for any associations which we observed. METHODS We recruited 38 master sprint runners (28 males, 10 females, mean age 71 ± 7 years), 149 master endurance runners (111 males, 38 females, mean age 70 ± 6 years) and 59 non-athletic controls (29 males, 30 females, mean age 74 ± 5 years). Dual X-ray absorptiometry was used to assess hip and spine bone mineral density (BMD), body composition (lean and fat mass), whilst jump power was assessed with jumping mechanography. In athletes, vertical impacts were recorded over 7 days from a waist-worn accelerometer, and details of starting age, age-graded performance and training hours were recorded. RESULTS In ANOVA models adjusted for sex, age, height, body composition, and jump power, sprinter hip BMD was 10 and 14% greater than that of endurance runners and controls respectively. Sprinter spine BMD was also greater than that of both endurance runners and controls. There were no differences in hip or spine BMD between endurance runners and controls. Stepwise regression showed only discipline (sprint/endurance), sex, and age as predictors of athlete spine BMD, whilst these variables and starting age were predictive of hip BMD. CONCLUSIONS Regular running is associated with greater BMD at the fracture-prone hip and spine sites in master sprinters but not endurance runners. These benefits cannot be explained by indicators of mechanical loading measured in this study including vertical impacts, body composition or muscular output.
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Affiliation(s)
- J. Piasecki
- Sport, Health and Performance Enhancement Research Centre, Nottingham Trent University, Nottingham, UK
| | - J. S. McPhee
- Department for Sports and Exercise Sciences, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester, M1 5GD UK
| | - K. Hannam
- Musculoskeletal Research Unit, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - K. C. Deere
- Musculoskeletal Research Unit, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - A. Elhakeem
- Musculoskeletal Research Unit, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - M. Piasecki
- MRC/ARUK Centre of Excellence for Musculoskeletal Ageing Research Centre, School of Medicine, University of Nottingham, Derby, UK
| | - H. Degens
- Department for Sports and Exercise Sciences, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester, M1 5GD UK ,Institute of Sport Science and Innovations, Lithuanian Sports University, Lithuania, Lithuania
| | - J. H. Tobias
- Musculoskeletal Research Unit, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - A. Ireland
- Department for Sports and Exercise Sciences, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester, M1 5GD UK
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Yeung S, Reijnierse E, Trappenburg M, Hogrel JY, Mcphee J, Piasecki M, Sipila S, Salpakoski A, Meskers C, Maier A. PT01.1: Agreement of Handgrip Strength and Quadriceps Strength Dependent on Age and Health Status. Clin Nutr 2017. [DOI: 10.1016/s0261-5614(17)30718-5] [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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Rudysh MY, Brik MG, Khyzhun OY, Fedorchuk AO, Kityk IV, Shchepanskyi PA, Stadnyk VY, Lakshminarayana G, Brezvin RS, Bak Z, Piasecki M. Ionicity and birefringence of α-LiNH4SO4crystals: ab initio DFT study, X-ray spectroscopy measurements. RSC Adv 2017. [DOI: 10.1039/c6ra27386f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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] Open
Abstract
The structural, electronic properties and ionicity of the α-LiNH4SO4dielectric crystals are examined using a complex approach: experimental studies of X-ray spectroscopy and the first principles band structure techniques within a framework of DFT.
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Khyzhun O, Piasecki M, Kityk I, Luzhnyi I, Fedorchuk A, Fochuk P, Levkovets S, Karpets M, Parasyuk O. Tl10Hg3Cl16: Single crystal growth, electronic structure and piezoelectric properties. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.07.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kalpana T, Gandhi Y, Sudarsan V, Piasecki M, Ravi Kumar V, Veeraiah N. Improving green emission of Tb 3+ ions in BaO-B 2 O 3 -P 2 O 5 glasses by means of Al 3+ ions. LUMINESCENCE 2016; 31:1358-1363. [PMID: 26935487 DOI: 10.1002/bio.3115] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 10/03/2015] [Revised: 12/07/2015] [Accepted: 01/21/2016] [Indexed: 12/20/2022]
Abstract
BaO-B2 O3 -P2 O5 glasses doped with a fixed concentration of Tb3+ ions and varying concentrations of Al2 O3 were synthesized, and the influence of the Al3+ ion concentration on the luminescence efficiency of the green emission of Tb3+ ions was investigated. The optical absorption, excitation, luminescence spectra and fluorescence decay curves of these glasses were recorded at ambient temperature. The emission spectra of terbium ions when excited at 393 nm exhibited two main groups of bands, corresponding to 5 D3 → 7 Fj (blue region) and 5 D4 → 7Fj (green region). From these spectra, the radiative parameters, viz., spontaneous emission probability A, total emission probability AT , radiative lifetime τ and fluorescent branching ratio β, of different transitions originating from the 5 D4 level of Tb3+ ions were evaluated based on the Judd-Ofelt theory. A clear increase in the quantum efficiency and luminescence of the green emission of Tb3+ ions corresponding to 5 D4 → 7 F5 transition is observed with increases in the concentration of Al2 O3 up to 3.0 mol%. The improvement in emission is attributed to the de-clustering of terbium ions by Al3+ ions and also to the possible admixing of wave functions of opposite parities. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- T Kalpana
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India
| | - Y Gandhi
- Department of Physics, Kakani Venkata Ratnam College, Nandigama-521 185, A.P., India
| | - V Sudarsan
- Bhabha Atomic Research Centre, Chemistry Division, Mumbai-400 085, India
| | - M Piasecki
- Institute of Physics, Jan Dlugosz University, Ul. Armii Krajowej 13/15, Czestochowa-42-201, Poland
| | - V Ravi Kumar
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India
| | - N Veeraiah
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India.
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15
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Parasyuk OV, Pavlyuk VV, Khyzhun OY, Kozer VR, Myronchuk GL, Sachanyuk VP, Dmytriv GS, Krymus A, Kityk IV, El-Naggar AM, Albassam AA, Piasecki M. Synthesis and structure of novel Ag2Ga2SiSe6 crystals: promising materials for dynamic holographic image recording. RSC Adv 2016. [DOI: 10.1039/c6ra19558j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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] Open
Abstract
Phase diagrams of the AgGaSe2–SiSe2 system were explored by differential thermal analysis (DTA) and X-ray diffraction (XRD) analysis methods for the first time.
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Piasecki M, Ireland A, Stashuk D, Hamilton-Wright A, Jones DA, McPhee JS. Age-related neuromuscular changes affecting human vastus lateralis. J Physiol 2015; 594:4525-36. [PMID: 26486316 PMCID: PMC4983624 DOI: 10.1113/jp271087] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [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: 06/12/2015] [Accepted: 10/12/2015] [Indexed: 12/25/2022] Open
Abstract
KEY POINTS Skeletal muscle size and strength decline in older age. The vastus lateralis, a large thigh muscle, undergoes extensive neuromuscular remodelling in healthy ageing, as characterized by a loss of motor neurons, enlargement of surviving motor units and instability of neuromuscular junction transmission. The loss of motor axons and changes to motor unit potential transmission precede a clinically-relevant loss of muscle mass and function. ABSTRACT The anterior thigh muscles are particularly susceptible to muscle loss and weakness during ageing, although how this is associated with changes to neuromuscular structure and function in terms of motor unit (MU) number, size and MU potential (MUP) stability remains unclear. Intramuscular (I.M.) and surface electromyographic signals were recorded from the vastus lateralis (VL) during voluntary contractions held at 25% maximal knee extensor strength in 22 young (mean ± SD, 25.3 ± 4.8 years) and 20 physically active older men (71.4 ± 6.2 years). MUP size, firing rates, phases, turns and near fibre (NF) jiggle were determined and MU number estimates (MUNEs) were made by comparing average surface MUP with maximal electrically-evoked compound muscle action potentials. Quadriceps cross-sectional area was measured by magnetic resonance imaging. In total, 379 individual MUs were sampled in younger men and 346 in older men. Compared to the MU in younger participants, those in older participants had 8% lower firing rates and larger MUP size (+25%), as well as increased complexity, as indicated by phases (+13%), turns (+20%) and NF jiggle (+11%) (all P < 0.0005). The MUNE values (derived from the area of muscle in range of the surface-electrode) in older participants were ∼70% of those in the young (P < 0.05). Taking into consideration the 30% smaller cross-sectional area of the VL, the total number of MUs in the older muscles was between 50% and 60% lower compared to in young muscles (P < 0.0005). A large portion of the VL MU pool is lost in older men and those recruited during moderate intensity contractions were enlarged and less stable. These MU changes were evident before clinically relevant changes to muscle function were apparent; nevertheless, the changes in MU number and size are probably a prelude to future movement problems.
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Affiliation(s)
- M Piasecki
- School of Healthcare Science, Manchester Metropolitan University, Manchester, UK
| | - A Ireland
- School of Healthcare Science, Manchester Metropolitan University, Manchester, UK
| | - D Stashuk
- Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - A Hamilton-Wright
- Mathematics and Computer Science, Mount Allison University, Sackville, New Brunswick, Canada
| | - D A Jones
- School of Healthcare Science, Manchester Metropolitan University, Manchester, UK
| | - J S McPhee
- School of Healthcare Science, Manchester Metropolitan University, Manchester, UK
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17
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Jagan Mohini G, Sahaya Baskaran G, Ravi Kumar V, Piasecki M, Veeraiah N. Bioactivity studies on TiO2-bearing Na2O–CaO–SiO2–B2O3 glasses. Materials Science and Engineering: C 2015; 57:240-8. [DOI: 10.1016/j.msec.2015.07.048] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 06/19/2015] [Accepted: 07/22/2015] [Indexed: 10/23/2022]
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Affiliation(s)
- M. G. Brik
- College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China
- Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia
- Institute of Physics, Jan Dlugosz University, Armii Krajowej 13/15, PL-42200 Czestochowa, Poland
| | - M. Piasecki
- Institute of Physics, Jan Dlugosz University, Armii Krajowej 13/15, PL-42200 Czestochowa, Poland
| | - I. V. Kityk
- Institute
of Materials Science and Engineering, Technical University of Czestochowa, Al. Armii Krajowej 19, PL-42200 Czestochowa, Poland
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19
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Parasyuk OV, Kadykalo EM, Marushko LP, Myronchuk G, Fedorchuk AO, Wojciechowski A, Piasecki M, Mzyk M, Kuznik W. IR laser induced spectra in novel crystals CdTe-CuInTe2. Spectrochim Acta A Mol Biomol Spectrosc 2013; 116:446-450. [PMID: 23973592 DOI: 10.1016/j.saa.2013.07.042] [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] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 07/12/2013] [Accepted: 07/21/2013] [Indexed: 06/02/2023]
Abstract
The novel crystalline alloys CdTe-CuInTe2 were synthesized. The photoinduced spectral changes of the anharmonic phonon modes were explored by cw CO2 laser at power about 2 kW in the vicinity of the 1650 cm(-1) mode. The changes of the intensities for principal phonon modes were found. These modes were assigned both to harmonic as well as anharmonic modes. All the measurements are studied after the Ir illumination. The performed quantum chemical calculations with application of the norm-conserving pseudopotential method and Green functions allow to identify the origin of the content dependent anharmonic phonon modes. Some correlation between the intensities of the corresponding phonon modes at about 1600-1700 cm(-1) and the corresponding IR induced changes were found.
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Affiliation(s)
- O V Parasyuk
- Chemical Department, Eastern European University, Al. Voli 6, Lutsk, Ukraine
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20
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Reshak AH, Auluck S, Piasecki M, Myronchuk GL, Parasyuk O, Kityk IV, Kamarudin H. Absorption and photoconductivity spectra of Ag₂GeS₃ crystal: experiment and theory. Spectrochim Acta A Mol Biomol Spectrosc 2012; 93:274-279. [PMID: 22484263 DOI: 10.1016/j.saa.2012.03.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 02/29/2012] [Accepted: 03/09/2012] [Indexed: 05/31/2023]
Abstract
Spectral features of polycrystalline Ag(2)GeS(3) samples synthesized from high-purity elements (at least 99.99 wt.% purity) in quartz ampoules evacuated to 0.1 Pa were explored. The band energy gap of Ag(2)GeS(3) crystals estimated from the fundamental absorption edge and photoconductivity spectra were found to be equal to 1.98 eV and 2.16 eV, respectively. Simultaneously we have performed calculations of the band structure, total and partial density of states and the electron charge density using the ab initio FP-LAPW method. All the calculations were performed with four different exchange-correlation (xc) potentials. It was found that the effect of using different xc is very marginal on the valence band maximum (VBM) while it is dramatically shifted the conduction band minimum (CBM) towards higher energies with respect to the Fermi energy position. Our theoretical results have given a band energy gap equal to 0.40 eV (for LDA), 0.42 eV (GGA), 1.03 eV (EVGGA) and 1.30 eV (mBJ) xc potentials. Thus the underestimation of the energy gap in LDA and GGA was partially corrected in EVGGA and mBJ model. As a remarkable fact mBJ did not bring the energy band gap very close to the experimental once. We have discovered that the Ag-s states have only a small effect on the conduction bands shifts whereas Ge-s states have a strong effect in extending of the gap, while remaining the valence bands unchanged.
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Affiliation(s)
- Ali Hussain Reshak
- School of Complex systems, FFWP-South Bohemia University, Nove Hrady 37333, Czech Republic
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21
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Chmiel M, Piasecki M, Myronchuk G, Lakshminarayana G, Reshak AH, Parasyuk OG, Kogut Y, Kityk IV. Optical and photoconductivity spectra of novel Ag₂In₂SiS₆ and Ag₂In₂GeS₆ chalcogenide crystals. Spectrochim Acta A Mol Biomol Spectrosc 2012; 91:48-50. [PMID: 22366613 DOI: 10.1016/j.saa.2012.01.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 01/20/2012] [Accepted: 01/23/2012] [Indexed: 05/31/2023]
Abstract
Complex spectral studies of near-band gap and photoconductive spectra for novel Ag(2)In(2)SiS(6) and Ag(2)In(2)GeS(6) single crystals are presented. The spectral dependences of photoconductivity clearly show an existence of spectral maxima within the 450 nm-540 nm and 780 nm-920 nm. The fundamental absorption edge is analyzed by Urbach rule. The origin of the spectral photoconductivity spectral maxima is discussed. Temperature dependences of the spectra were done. The obtained spectral features allow to propose the titled crystals as photosensors. An analysis of the absorption and photoconductivity spectra is given within a framework of oversimplified spectroscopic model of complex chalcogenide crystals.
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Affiliation(s)
- M Chmiel
- Central School of the State Fire Service, Sabinowska 62, Czestohcowa, Poland
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22
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Reshak AH, Piasecki M, Auluck S, Kityk IV, Khenata R, Andriyevsky B, Cobet C, Esser N, Majchrowski A, Świrkowicz M, Diduszko R, Szyrski W. Effect of U on the Electronic Properties of Neodymium Gallate (NdGaO3): Theoretical and Experimental Studies. J Phys Chem B 2009; 113:15237-42. [DOI: 10.1021/jp908025p] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ali Hussain Reshak
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - M. Piasecki
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - S. Auluck
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - I. V. Kityk
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - R. Khenata
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - B. Andriyevsky
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - C. Cobet
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - N. Esser
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - A. Majchrowski
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - M. Świrkowicz
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - R. Diduszko
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
| | - W. Szyrski
- Institute of Physical Biology, South Bohemia University, Nove Hrady 37333, Czech Republic, Institute of Physics, J.Dlugosz University, Al. Armii Krajowej13/15, 42-200 Czestochowa, Poland, Physics Department, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India, Electrical Engineering Department, Technological University of Czestochowa, Al.Armii Krajowej 17/19, 42-200 Czestochowa, Poland, Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie,
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Satyanarayana T, Kityk IV, Piasecki M, Bragiel P, Brik MG, Gandhi Y, Veeraiah N. Structural investigations on PbO-Sb(2)O(3)-B(2)O(3):CoO glass ceramics by means of spectroscopic and dielectric studies. J Phys Condens Matter 2009; 21:245104. [PMID: 21693937 DOI: 10.1088/0953-8984/21/24/245104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
PbO-Sb(2)O(3)-B(2)O(3) glasses mixed with different concentrations of CoO (ranging from 0 to 2.0 mol%) were crystallized. The samples were characterized by x-ray diffraction, scanning electron microscopy and differential scanning calorimetric techniques. The x-ray diffraction and scanning electron microscopic studies have revealed the presence of CoSb(2)O(6), Co(2.33)Sb(0.67)O(4), Pb(5)Sb(2)O(8),Pb(3)(SbO(4))(2), PbB(4)O(7) and Co(3)O(4) crystalline phases in these samples. The DSC studies have indicated the spreading of the crystallization from the inside to the surface of the samples as the concentration of the crystallizing agent is increased. The IR and Raman spectroscopic studies have pointed out the existence of conventional BO(3), BO(4), SbO(4) and also Co(III)-O structural units in the glass ceramic samples. These studies have further indicated the decreasing concentration of symmetrical structural vibrational groups with increase in the concentration of CoO. The results of various studies, namely dielectric properties over a range of frequency and temperature, photo-induced birefringence, optical absorption, fluorescence and magnetic susceptibility at room temperature of PbO-Sb(2)O(3)-B(2)O(3):CoO glass ceramics, have also been reported. The variations observed as a function of the concentration of crystallizing agent in all these properties have been analyzed in the light of different oxidation states and environments of cobalt ions in the glass ceramic network.
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Affiliation(s)
- T Satyanarayana
- Department of Physics, Acharya Nagarjuna University-Nuzvid Campus, Nuzvid 521 201, AP, India
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24
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Ozga K, Kawaharamura T, Ali Umar A, Oyama M, Nouneh K, Slezak A, Fujita S, Piasecki M, Reshak AH, Kityk IV. Second order optical effects in Au nanoparticle-deposited ZnO nanocrystallite films. Nanotechnology 2008; 19:185709. [PMID: 21825705 DOI: 10.1088/0957-4484/19/18/185709] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Photoinduced second harmonic generation (SHG) in Au nanoparticle-deposited ZnO nanocrystallite (NC) films was explored by applying bicolor coherent treatment of a Nd-YAG laser with wavelength 1.06 µm and its SHG. We have established that coexistence of the ZnO and Au nanoparticles gives a substantially larger SHG output with respect to pure ZnO NC deposited on the glass substrate. It was established that the value of the second order susceptibility is about 23 pm V(-1). Better nonlinear optical susceptibilities were obtained during phototreatment at temperatures near 30-35 °C for the Au doped samples. The samples without gold NCs are temperature independent. Generally an increasing temperature leads to a decrease of the optical SHG.
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Affiliation(s)
- K Ozga
- Institute of Biology and Biophysics, Technical University Czestochowa, PL-42214, Aleja Armii Krajowej 36, Czestochowa, Poland
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Piasecki M, Kityk I, Bragiel P, Ozga K, Kapustianyk V, Sahraoui B. Non-linear optical monitoring of melting processes in (TEA)–CoCl2Br2 ferroelectric nanocrystallites incorporated into polymer matrices. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.11.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Latus-Zietkiewicz D, Chelkowski J, Foremska E, Goliński P, Grabarkiewicz-Szczesna J, Kostecki M, Lew M, Perkowski J, Piasecki M, Wiewiórowska M, Szebiotko K. Biosynthesis of gibberellic acid (GA3) and mycotoxins by F. moniliforme sheldon and other species of Liseola section. Nat Toxins 2006; 4:228-33. [PMID: 8946398 DOI: 10.1002/(sici)(1996)4:5<228::aid-nt5>3.0.co;2-g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
F. moniliforme and other species of Liseola section, F. culmorum, F. dlamini, and F. nygamai, were examined for their ability to produce gibberellic acid (GA3), fumonisins, trichothecenes, zearalenone, moniliformin, and bikaverin (TLC method). Gibberellic acid was produced by F. moniliforme strains in liquid medium and on rice kernels with a maximum concentration level of 470 mg/dm3 and 1 g/kg, respectively. No strain isolated in Poland produced GA3. High-yielding gibberellic acid strains produced neither trichothecenes and fumonisins nor other tested compounds. Also the rest of strains of examined species did not produce trichothecenes and other mycotoxins except for fumonisins which were found in rice cultures of F. moniliforme, F. proliferatum, and F. subglutinans. Bikaverin was produced by F. moniliforme always together with fumonisins. Filtrates of liquid cultures of gibberellin producing strains were tested for their toxicity to brine shrimps larvae (Artemia salina). It was found that GA3 presence does not increase toxicity of these filtrates.
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Affiliation(s)
- D Latus-Zietkiewicz
- Institute of Food Technology of Plant Origin, Agricultural University-Poznań, Poland
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Potter A, Corwin J, Lang J, Piasecki M, Lenox R, Newhouse PA. Acute effects of the selective cholinergic channel activator (nicotinic agonist) ABT-418 in Alzheimer's disease. Psychopharmacology (Berl) 1999; 142:334-42. [PMID: 10229057 DOI: 10.1007/s002130050897] [Citation(s) in RCA: 120] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
To explore further the potential for cognitive enhancement utilizing nicotinic stimulation in Alzheimer's disease (AD), six otherwise healthy subjects with moderate AD received placebo and three doses (6, 12, and 23 mg) of the novel selective cholinergic channel activator (ChCA) (nicotinic agonist) ABT-418 over 6 h in a double-blind, within-subjects, repeated-measures design. Subjects showed significant improvements in total recall and a decline in recall failure on a verbal learning task. Qualitatively similar improvements were seen in non-verbal learning tasks such as spatial learning and memory, and repeated acquisition. No significant behavioral, vital sign, or physical side effects were seen. These results confirm that stimulating central nicotinic receptors has acute cognitive benefit in AD patients. These findings suggest that selective ChCAs have a potential therapeutic role in dementing disorders, and that further studies with this or similar agents in AD and/or Parkinson's disease are warranted.
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Affiliation(s)
- A Potter
- Department of Psychiatry, University of Vermont College of Medicine, Burlington 05401, USA
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Affiliation(s)
- O J Thienhaus
- Department of Psychiatry at the University of Nevada School of Medicine, Reno 89557-0046, USA
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30
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Affiliation(s)
- O J Thienhaus
- Department of Psychiatry, University of Nevada School of Medicine, Reno 89557, USA
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Abstract
One hundred eighty male managers participated as age-homogeneous 4-person teams in a validated all-day decision-making simulation. Fifteen teams consisted of 28- to 35-year-old participants (young), 15 teams were in the 45-55 age range (middle-aged), and 15 teams consisted of 65- to 75-year-old (older) persons. More than 40 objective performance measures (loading on 12-15 factors) were calculated on the basis of team decision making, planning, and other indicators. Performance by young and middle-aged teams was generally similar. Older teams made fewer decisions and were less strategic and less responsive to incoming information. Their overview of the task was less broad; action diversity and information search was reduced. However, older teams used opportunities and handled a simulated emergency as effectively as their younger and middle-aged counterparts. Alternative explanations for the obtained differences are presented.
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Affiliation(s)
- S Streufert
- Department of Behavioral Science, Pennsylvania State University College of Medicine, Hershey 17033
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Abstract
The effect of treatment with the beta-blocker metoprolol on several indicants of task performance was investigated. Twenty-five male hypertensives were treated for 2 weeks each with drug and placebo in a double-blind crossover design. Comparisons to 25 matched untreated normotensives were made. Participants responded twice to a Mood Adjective Check List (MACL) and the Stroop Color-Word Test. In addition, they participated in two parallel decision-making simulations. Normotensives and hypertensives on drug or placebo did not differ on MACL and Stroop scores. Comparisons on 12 validated simulation measures showed that drug treatment with metoprolol aided complex task performance. Drug treatment improved strategic capacity and the ability to deal effectively with emergencies. Preliminary evidence that treatment with metoprolol might help restore performance capacity that may have been lost due to hypertensive disease was also obtained.
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Affiliation(s)
- S Streufert
- Department of Behavioral Science, College of Medicine, Pennsylvania State University, Hershey 17033
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Abstract
Fifty adult men with mild to moderate hypertension were recruited to participate in a double-blind crossover study. Each subject received 14 days of drug treatment and 14 days of placebo treatment (random order). Half the subjects were assigned to a metoprolol (150 mg/day) vs placebo treatment regimen and half to an atenolol (100 mg/day) vs placebo regimen. Blood pressure levels as well as measures of simple (proofreading), intermediate (visual-motor task), and complex (management simulation) task performance were obtained at the end of the drug and placebo treatment periods. Metoprolol treatment generated better scores than did placebo or atenolol treatment for proofreading, visual-motor performance, and several measures of complex managerial competence. Atenolol treatment generally resulted in performance levels that did not differ from those observed with placebo. However, atenolol-treated subjects made more errors than did placebo-treated subjects in the visual-motor task and also showed some deterioration on one measure of complex managerial functioning.
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Affiliation(s)
- S Streufert
- College of Medicine, Milton S. Hershey Medical Center, Pennsylvania State University, Hershey 17033
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von Volkmann T, Piasecki M, Kugler B, Hammacher A, Klotz E. [Experiences with processing control in the radiology department of a large municipal hospital]. Rontgenblatter 1986; 39:362-6. [PMID: 3809923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Processing control is an important part of quality control in X-ray diagnostics. From 1 July 1984 to 31 December 1985 the processing of 10 of the 11 processors in the Radiology Department at the Augsburg Municipal Hospital was controlled regularly on a total of 304 days. The speed index was at 95.8%, the contrast index at 96.1% within the limits recommended by the Federal German DIN standard. Processing control has proved meaningful and effective in keeping processing on a constant level. It also indicates where to look for the reasons for poor image quality. It takes less than 5 minutes to carry out the processing control of one processor. Processing control is a task of the radiographer.
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Piasecki M, Buratowski J. [Objective evaluation of corneal transparency in experimental animals]. Klin Oczna 1976; 46:21-3. [PMID: 1249885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Buratowski J, Piasecki M. [Electronic prostheses of the organ of vision]. Pol Tyg Lek 1975; 30:2025-6. [PMID: 1197087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Buratowski J, Piasecki M, Sieiński W. [Effect of low temperature on the course of experimental corneal burns by hydrochloric acid]. Klin Oczna 1975; 45:739-42. [PMID: 1160294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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38
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Buratowski J, Warczyński A, Piasecki M. [Effect of small concentrations of nicotine on visual adaptation and visual acuity in non-smokers]. Pol Tyg Lek 1974; 29:1077-8. [PMID: 4842712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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