1
|
Alghamdi EA, Sai R. Augmenting the band gap of iron diselenide pyrite via ruthenium alloy integration. Heliyon 2024; 10:e25965. [PMID: 38390128 PMCID: PMC10881853 DOI: 10.1016/j.heliyon.2024.e25965] [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: 11/17/2023] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/24/2024] Open
Abstract
The study aimed to enhance the properties of thin F e S e 2 films by incorporating ruthenium through spray pyrolysis. Films were deposited on pre-heated glass substrates and subjected to controlled heating in a selenium-rich environment. X-ray diffraction analysis confirmed the presence of F e S e 2 phase. Films with specific ruthenium ratios showed notable improvements in optical attributes, including increased absorption coefficient and a higher direct band gap, aligning with desired values for photovoltaic applications. Hall Effect measurements revealed N-type conductivity with varying concentrations and temperature-dependent electrical properties. The results highlight the efficacy of ruthenium as a promising alloying candidate for developing photovoltaic materials, emphasizing the versatility of the produced films across multiple domains.
Collapse
Affiliation(s)
- Eman A Alghamdi
- Department of Physics and Astronomy, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Refka Sai
- Department of Physics and Astronomy, King Saud University, Riyadh, 11451, Saudi Arabia
| |
Collapse
|
2
|
Ngoc HV, Thuy HTP. Electrical and optical properties of C, Ge-doped armchair silicene nanoribbons applied in optoelectronics. J Phys Condens Matter 2023. [PMID: 37321257 DOI: 10.1088/1361-648x/acdebe] [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] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
With the continuous development of nanotechnology, the search for new material structures plays a crucial role. Silicene nanoribbons are one-dimensional materials that hold promise for numerous potential applications in the future. The electric and optical properties of C, Ge-doped armchair silicene nanoribbons are investigated in this study using Density Functional Theory (DFT). All the doped configurations are stable and maintain the honeycomb hexagonal structure after optimization. Doping with C yields flatter structures, while doping with Ge yields larger buckling heights. The C 1-1 doping configuration is highlighted because its band gap is extended up to 2.35 eV, making it an ideal candidate for potential optoelectronic applications. The charge distribution, charge density difference, and hybridization of multiple orbitals are also systematically studied. The optical properties reveal the differences between C and Ge doping, with a clear anisotropy observed. Strong absorption occurs at high electromagnetic wave energies,, while the absorption coefficient rapidly decreases in the long-wavelength range. The study of electron-hole density shows good agreement with the energy band structure, where electron-hole pairs only exist when the excitation energy is greater than the bandgap width, and not all excitation energy values give rise to electron-hole pairs. This study contributes a small part to creating potential applications in nanotechnology.
Collapse
Affiliation(s)
- Hoang Van Ngoc
- Thu Dau Mot University, No. 06 Tran Van On street, Thu Dau Mot, 820000, VIET NAM
| | | |
Collapse
|
3
|
Shanmugasundaram V, Shanmugam B. Characterisation of magnesite mine tailings as a construction material. Environ Sci Pollut Res Int 2021; 28:45557-45570. [PMID: 33866509 DOI: 10.1007/s11356-021-13890-x] [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: 01/12/2021] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
Magnesite Mine Tailings (MMT) is a kind of waste produced during the mining of magnesite ore. Due to open cast mining process, huge amount of tailings are generated and dumped as open landfill that leads to numerous environmental hazards in the vicinity. MMT from Salem mine dump site, India, is collected, and a series of laboratory tests related to physical, chemical, mineralogical, mechanical, electrical and thermal properties have been conducted to characterise the MMT as construction material. Further, the results are compared with river sand and conventional coarse aggregates. The results indicate that the MMT can be used as aggregates in concrete for non-wearing surfaces, manufacturing of bricks, low thermal insulation panels, embankment and thermal insulation fills.
Collapse
Affiliation(s)
| | - Balaji Shanmugam
- Department of Civil Engineering, Kongu Engineering College, Perundurai, Tamil Nadu, India
| |
Collapse
|
4
|
Gwag HB, Kim JS, Park KM, On YK, Park SJ. Changes in cardiac conduction time following cardiac resynchronization therapy: rationale and design of the RECOVER study. J Interv Card Electrophysiol 2021. [PMID: 33774800 DOI: 10.1007/s10840-021-00979-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 03/10/2021] [Indexed: 12/23/2022]
Abstract
BACKGROUND It has been known that ventricular conduction delays play a key role in the cardiac resynchronization therapy (CRT) response of patients with advanced heart failure (HF). However, no study to our knowledge has yet evaluated the serial changes in conduction times measured between different electrodes of CRT devices. METHODS AND RESULTS The Reduction or Extension of Conduction Time with Ventricular Electromechanical Remodeling (RECOVER) study (NCT04397224) was designed to investigate serial changes in interelectrode conduction times and to elucidate their prognostic value. We plan to enroll 100 patients implanted with CRT systems with endocardial quadripolar left ventricular leads. Patients will be scheduled for follow-up every 3 months over a period of 2 years, where they will undergo measurement of interelectrode conduction times to evaluate their serial changes. The primary outcome of the RECOVER study is the correlation between the degree of conduction time changes and the CRT response as defined by echocardiography. The time course and prognostic value of the serial changes in conduction times will be investigated as well. CONCLUSION The RECOVER study is investigating whether serial changes in interelectrode conduction times can be useful parameters in predicting the CRT response or detecting worsening HF at an early stage.
Collapse
|
5
|
Xu L, Shoaie N, Jahanpeyma F, Zhao J, Azimzadeh M, Al Jamal KT. Optical, electrochemical and electrical (nano)biosensors for detection of exosomes: A comprehensive overview. Biosens Bioelectron 2020; 161:112222. [PMID: 32365010 DOI: 10.1016/j.bios.2020.112222] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [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: 12/24/2019] [Revised: 04/14/2020] [Accepted: 04/16/2020] [Indexed: 12/13/2022]
Abstract
Exosomes are small extracellular vesicles involved in many physiological activities of cells in the human body. Exosomes from cancer cells have great potential to be applied in clinical diagnosis, early cancer detection and target identification for molecular therapy. While this field is gaining increasing interests from both academia and industry, barriers such as supersensitive detection techniques and highly-efficient isolation methods remain. In the clinical settings, there is an urgent need for rapid analysis, reliable detection and point-of-care testing (POCT). With these challenges to be addressed, this article aims to review recent developments and technical breakthroughs including optical, electrochemical and electrical biosensors for exosomes detection in the field of cancer and other diseases and demonstrate how nanobiosensors could enhance the performance of conventional sensors. Working strategies, limit of detections, advantages and shortcomings of the studies are summarized. New trends, challenges and future perspectives of exosome-driven POCT in liquid biopsy have been discussed.
Collapse
Affiliation(s)
- Lizhou Xu
- Institute of Pharmaceutical Science, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, United Kingdom
| | - Nahid Shoaie
- Department of Biotechnology, Tarbiat Modares University of Medical Science, Tehran, Iran
| | - Fatemeh Jahanpeyma
- Department of Biotechnology, Tarbiat Modares University of Medical Science, Tehran, Iran
| | - Junjie Zhao
- Institute of Pharmaceutical Science, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, United Kingdom
| | - Mostafa Azimzadeh
- Medical Nanotechnology & Tissue Engineering Research Center, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, 89195-999, Yazd, Iran; Stem Cell Biology Research Center, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, 89195-999, Yazd, Iran; Department of Advanced Medical Sciences and Technologies, School of Paramedicine, Shahid Sadoughi University of Medical Sciences, 8916188635, Yazd, Iran.
| | - Khuloud T Al Jamal
- Institute of Pharmaceutical Science, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, United Kingdom.
| |
Collapse
|
6
|
Michelle Welman FHS, Smit AE, Jongen JLM, Tibboel D, van der Geest JN, Holstege JC. Pain Experience is Somatotopically Organized and Overlaps with Pain Anticipation in the Human Cerebellum. Cerebellum 2019; 17:447-460. [PMID: 29480507 PMCID: PMC6028829 DOI: 10.1007/s12311-018-0930-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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] [Indexed: 12/19/2022]
Abstract
Many fMRI studies have shown activity in the cerebellum after peripheral nociceptive stimulation. We investigated whether the areas in the cerebellum that were activated after nociceptive thumb stimulation were separate from those after nociceptive toe stimulation. In an additional experiment, we investigated the same for the anticipation of a nociceptive stimulation on the thumb or toe. For his purpose, we used fMRI after an electrical stimulation of the thumb and toe in 19 adult healthy volunteers. Following nociceptive stimulation, different areas were activated by stimulation on the thumb (lobule VI ipsilaterally and Crus II mainly contralaterally) and toe (lobules VIII-IX and IV-V bilaterally and lobule VI contralaterally), i.e., were somatotopically organized. Cerebellar areas innervated non-somatotopically by both toe and thumb stimulation were the posterior vermis and Crus I, bilaterally. In the anticipation experiment, similar results were found. However, here, the somatotopically activated areas were relatively small for thumb and negligible for toe stimulation, while the largest area was innervated non-somatotopically and consisted mainly of Crus I and lobule VI bilaterally. These findings indicate that nociceptive stimulation and anticipation of nociceptive stimulation are at least partly processed by the same areas in the cerebellum. This was confirmed by an additional conjunction analysis. Based on our findings, we hypothesize that input that is organized in a somatotopical manner reflects direct input from the spinal cord, while non-somatotopically activated parts of the cerebellum receive their information indirectly through cortical and subcortical connections, possibly involved in processing contextual emotional states, like the expectation of pain.
Collapse
Affiliation(s)
- F H S Michelle Welman
- Department of Neuroscience, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, the Netherlands
| | - Albertine E Smit
- Department of Neuroscience, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, the Netherlands
| | - Joost L M Jongen
- Department of Neurology, Erasmus MC, Room G3-78, Groene Hilledijk 301, 3075 EA, Rotterdam, the Netherlands.
| | - Dick Tibboel
- Department of Intensive Care and Pediatric Surgery, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, the Netherlands
| | - Jos N van der Geest
- Department of Neuroscience, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, the Netherlands
| | - Jan C Holstege
- Department of Neuroscience, Erasmus MC, Wytemaweg 80, 3015 CN, Rotterdam, the Netherlands
| |
Collapse
|
7
|
Parmin NA, Hashim U, Gopinath SCB, Nadzirah S, Rejali Z, Afzan A, Uda MNA. Human Papillomavirus E6 biosensing: Current progression on early detection strategies for cervical Cancer. Int J Biol Macromol 2018; 126:877-890. [PMID: 30597241 DOI: 10.1016/j.ijbiomac.2018.12.235] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 09/14/2018] [Revised: 11/20/2018] [Accepted: 12/25/2018] [Indexed: 01/22/2023]
Abstract
Prognosis of early cancer detection becomes one of the tremendous issues in the medical health system. Medical debates among specialist doctor and researcher in therapeutic approaches became a hot concern for cervix cancer deficiencies early screening, risk factors cross-reaction, portability device, rapid and free labeling system. The electrical biosensing based system showed credibility in higher specificity and selectivity due to hybridization of DNA duplex between analyte target and DNA probes. Electrical DNA sensor for cervix cancer has attracted too many attentions to researcher notification based on high performance, easy to handle, rapid system and possible to miniaturize. This review explores the current progression and future insignificant for HPV E6 genobiosensing for early Detection Strategies of Cervical Cancer.
Collapse
Affiliation(s)
- N A Parmin
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia; School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia.
| | - Uda Hashim
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia; School of Microelectronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia
| | - Subash C B Gopinath
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia; School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia
| | - S Nadzirah
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia
| | - Zulida Rejali
- Department of Obstetrics and Gynaecology (O&G), Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Amilia Afzan
- Department of Obstetrics and Gynaecology (O&G), Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - M N A Uda
- School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia
| |
Collapse
|
8
|
Kang S, Kufta K, Sollecito TP, Panchal N. A treatment algorithm for the management of intraoral burns: A narrative review. Burns 2017; 44:1065-1076. [PMID: 29032979 DOI: 10.1016/j.burns.2017.09.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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] [Received: 03/16/2017] [Revised: 07/25/2017] [Accepted: 09/19/2017] [Indexed: 11/19/2022]
Abstract
Oral mucosa follows a distinctly different trajectory of wound healing than skin. Although there are contemporary guidelines regarding treatment of burns to the skin, there is no standard of care specific to intraoral burns. This narrative review proposes an evidence-based treatment algorithm for the management of intraoral burns. Data was collated through a comprehensive review of the literature and only included studies that have reported particular success with favorable short- and long-term prognoses. In order to critically appraise the strength of the treatment recommendations, the GRADE criteria was applied to each arm of the algorithm. The algorithm was initially subdivided into the four primary etiologies of intraoral burns - thermogenic, cryogenic, chemical, electrical. Our findings emphasize the importance of conservative modalities of intra-oral burn treatment.
Collapse
Affiliation(s)
- Steve Kang
- University of Pennsylvania School of Dental Medicine, Robert Schattner Center, Oral Surgery Clinic, 240 S. 40th Street, Philadelphia, PA 19104, United States.
| | - Kenneth Kufta
- University of Pennsylvania School of Dental Medicine, Robert Schattner Center, Oral Surgery Clinic, 240 S. 40th Street, Philadelphia, PA 19104, United States; University of Pennsylvania Health System, Perelman Center for Advanced Medicine, South Pavilion, 4th Floor, 3400 Civic Center Boulevard, Philadelphia, PA 19104, United States.
| | - Thomas P Sollecito
- University of Pennsylvania School of Dental Medicine, Robert Schattner Center, Oral Surgery Clinic, 240 S. 40th Street, Philadelphia, PA 19104, United States; University of Pennsylvania Health System, Perelman Center for Advanced Medicine, South Pavilion, 4th Floor, 3400 Civic Center Boulevard, Philadelphia, PA 19104, United States.
| | - Neeraj Panchal
- University of Pennsylvania School of Dental Medicine, Robert Schattner Center, Oral Surgery Clinic, 240 S. 40th Street, Philadelphia, PA 19104, United States; University of Pennsylvania Health System, Perelman Center for Advanced Medicine, South Pavilion, 4th Floor, 3400 Civic Center Boulevard, Philadelphia, PA 19104, United States; Philadelphia Veterans Affairs Medical Center, University of Pennsylvania Presbyterian Medical Center, 565 Wright Saunders, 51 N. 39th Street, Philadelphia, PA 19104, United States.
| |
Collapse
|
9
|
Chinyere IR, Moukabary T, Goldman S, Juneman E. Electrical and mechanical alternans during ventricular tachycardia with moderate chronic heart failure. J Electrocardiol 2018; 51:33-7. [PMID: 29129349 DOI: 10.1016/j.jelectrocard.2017.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Indexed: 11/20/2022]
Abstract
A chronic heart failure (CHF) rat underwent epicardial programmed electrical stimulation (PES). Ventricular tachycardia (VT) developed during PES. Mechanical alternans was noted despite fixed tachycardia cycle length. Anti-tachycardia pacing attempts initiated a second VT that generated pulse intermittently and then degenerated into pulseless VT with electrical alternans.To our knowledge electrical and mechanical alternans have not been recorded in animal models of CHF during VT. The distinct events of mechanical alternans and electrical alternans may be indicative of progressively worsened calcium handling in the compromised cardiomyocytes.Although ion channel differences between rodents and humans exist, this work attempts to demonstrate this rat model's usefulness in understanding cardiac electrophysiology in CHF.
Collapse
|
10
|
Qu F, Wang FF, Wu Y, Zhou J, Robinson N, Hardiman PJ, Pan JX, He YJ, Zhu YH, Wang HZ, Ye XQ, He KL, Cui L, Zhao HL, Ye YH. Transcutaneous Electrical Acupoint Stimulation Improves the Outcomes of In Vitro Fertilization: A Prospective, Randomized and Controlled Study. Explore (NY) 2017; 13:306-312. [PMID: 28915981 DOI: 10.1016/j.explore.2017.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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] [Received: 09/01/2016] [Indexed: 01/20/2023]
Abstract
OBJECTIVES To explore whether transcutaneous electrical acupoint stimulation (TEAS) can improve the outcomes of in vitro fertilization (IVF). DESIGN A prospective, randomized, and controlled study. SETTING IVF center in a university hospital. PARTICIPANTS Four hundred and eighty-one infertile patients with bilateral tubal blockage who were referred for IVF. Patients were randomized into four groups. INTERVENTION TEAS was administered for 30min, respectively, at 24h before TVOR and two hours before ET. The acupoints included SP10 (Xuehai, bilateral), SP8 (Diji, bilateral), LR3 (Taichong, bilateral), ST36 (Zusanli, bilateral), EX-CA1 (Zigong, bilateral), RN4 (Guanyuan), PC6 (Neiguan, bilateral), and RN12 (Zhongwan). Based on different frequencies of TEAS, patients were grouped into a TEAS-2Hz group, a TEAS-100Hz group and a TEAS-2/100Hz group. Patients in the control group only received routine IVF treatment and no TEAS was applied on them. PRIMARY AND SECONDARY OUTCOME MEASURES The number of mature oocytes, normally fertilized oocytes and good-quality embryos were used to evaluate oocyte developmental competence of the patients. Data of clinical pregnancy rate (CPR), implantation rate (IR), and live birth rate (LBR) were also obtained. The levels of neuropeptide Y (NPY), transforming growth factor alpha and granulocyte colony-stimulating factor in the follicular fluids were measured with enzyme-linked immunosorbent assay (ELISA). RESULTS No significant differences were found between the control, TEAS-2Hz, TEAS-100Hz and TEAS-2/100Hz groups on the numbers of metaphase II oocytes, normally fertilized zygotes, early cleavage embryos or good quality embryos (P > .05). However, the CPR, IR and LBR of the TEAS-2/100Hz group were significantly higher than those of the other groups, respectively (P < .05). The NPY levels in the follicular fluids of TEAS-2/100Hz group were significantly higher than those of the other groups (P < .05). CONCLUSION TEAS using a frequency of 2/100Hz could help to improve the IVF outcomes partly by increasing NPY levels in the follicular fluids.
Collapse
Affiliation(s)
- Fan Qu
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China; Institute for Women's Health, University College London Medical School, London, United Kingdom
| | - Fang-Fang Wang
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yan Wu
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jue Zhou
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang, China
| | | | - Paul J Hardiman
- Institute for Women's Health, University College London Medical School, London, United Kingdom
| | - Jie-Xue Pan
- Reproductive Medicine Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yi-Jing He
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Yu-Hang Zhu
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Han-Zhi Wang
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xiao-Qun Ye
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ke-Lin He
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Long Cui
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hong-Li Zhao
- Hangzhou Hospital of Traditional Chinese Medicine, Hangzhou, Zhejiang, China
| | - Ying-Hui Ye
- Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.
| |
Collapse
|
11
|
Haba Y, Wurm A, Köckerling M, Schick C, Mittelmeier W, Bader R. Characterization of human cancellous and subchondral bone with respect to electro physical properties and bone mineral density by means of impedance spectroscopy. Med Eng Phys 2017; 45:34-41. [PMID: 28462825 DOI: 10.1016/j.medengphy.2017.04.002] [Citation(s) in RCA: 9] [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: 02/02/2016] [Revised: 02/23/2017] [Accepted: 04/02/2017] [Indexed: 11/28/2022]
Abstract
Computational simulation of electrical bone stimulation of the electrical and dielectric parameters of osteoarthritic bone tissue is useful for an exact patient-individual adaptation of the bone models. Therefore, we investigated electrical and dielectric parameters at a frequency of 20Hz of cancellous and subchondral human femoral head bone samples. Furthermore, the mechanical properties and the bone mineral density (BMD) were determined. Finally, these data were compared with the electrical and dielectric parameters. The bone samples were taken from patients with hip osteoarthritis. Electrical conductivity and dielectric permittivity of cancellous bone amounted to 0.043S/m and 8.1⋅106. BMD of the bone samples determined by dual-x-ray-absorptiometry (DXA) and ashing resulted in 193 ± 70mg/cm² and 286 ± 59mg/cm³ respectively. Structural modulus (ES) and ultimate compression strength (σmax) were measured with 227 ± 94N/mm² and 6.5 ± 3.4N/mm². No linear correlation of the electrical and dielectric parameters compared with BMD and mechanical properties of cancellous bone samples was found. Electrical conductivity and dielectric permittivity of subchondral bone resulted in 0.029S/m and 8.97×106.
Collapse
Affiliation(s)
- Yvonne Haba
- University Medicine Rostock, Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory Rostock, Germany.
| | - Andreas Wurm
- University of Rostock, Institute of Physics, Polymer Physics Group, Rostock, Germany.
| | - Martin Köckerling
- University of Rostock, Institute of Chemistry, Inorganic Solid State Chemistry Group, Rostock, Germany.
| | - Christoph Schick
- University of Rostock, Institute of Physics, Polymer Physics Group, Rostock, Germany.
| | - Wolfram Mittelmeier
- University Medicine Rostock, Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory Rostock, Germany.
| | - Rainer Bader
- University Medicine Rostock, Department of Orthopaedics, Biomechanics and Implant Technology Research Laboratory Rostock, Germany.
| |
Collapse
|
12
|
Volberg V, Fordyce T, Leonhard M, Mezei G, Vergara X, Krishen L. Injuries among electric power industry workers, 1995-2013. J Safety Res 2017; 60:9-16. [PMID: 28160819 DOI: 10.1016/j.jsr.2016.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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: 03/22/2016] [Revised: 07/06/2016] [Accepted: 11/17/2016] [Indexed: 06/06/2023]
Abstract
INTRODUCTION Workers in the electric power industry face many risks of injury due to the high diversity of work tasks performed in potentially hazardous and unpredictable work environments. METHOD We calculated injury rates by age, sex, occupational group, and injury type among workers in the Electric Power Research Institute's (EPRI) Occupational Health and Safety Database (OHSD), which contains recordable injury, medical claims, and personnel data from 18 participating electric power companies from 1995 to 2013. RESULTS The OHSD includes a total of 63,193 injuries over 1,977,436 employee-years of follow-up, for an overall injury rate of 3.20 injuries per 100 employee-years. Annual injury rates steadily decreased from 1995 to 2000, increased sharply in 2001, and subsequently decreased to their lowest rate of 1.31 injuries per 100 employee-years in 2013. Occupations with the highest injury rates were welders (13.56 per 100 employee-years, 95% CI 12.74-14.37), meter readers (12.04 per 100 employee-years, 95% CI 11.77-12.31), and line workers (10.37 per 100 employee-years, 95% CI 10.19-10.56). Males had an overall higher injury rate compared to females (2.74 vs. 1.61 per 100 employee-years) although some occupations, such as meter reader, had higher injury rates for females. For all workers, injury rates were highest for those in the 21 to 30 age group (3.70 per 100 employee-years) and decreased with age. Welders and machinists did not follow this trend and had higher injury rates in the 65+ age group. There were 63 fatalities over the 1995 to 2013 period, with 21 fatalities (33.3%) occurring among line workers. CONCLUSIONS Although injury rates have decreased over time, certain high-risk groups remain (i.e., line workers, mechanics, young males, older welders and machinists, and female meter readers). PRACTICAL APPLICATIONS Protective measures and targeted safety programs may be warranted to ensure the safety of electric power workers.
Collapse
Affiliation(s)
- Vitaly Volberg
- Exponent, 475 14th St #400, Oakland, CA 94612, United States
| | - Tiffani Fordyce
- Exponent, 149 Commonwealth Drive Menlo Park, CA 94025, United States.
| | - Megan Leonhard
- Exponent, 15375 SE 30th Place, Suite 250, Bellevue, WA 98007, United States
| | - Gabor Mezei
- Exponent, 149 Commonwealth Drive Menlo Park, CA 94025, United States
| | - Ximena Vergara
- The Electric Power Research Institute (EPRI), 3420 Hillview Ave, Palo Alto, CA 94304, United States
| | - Lovely Krishen
- EPRI, 942 Corridor Park Blvd, Knoxville, TN 37932, United States
| |
Collapse
|
13
|
Wendling F, Gerber U, Cosandier-Rimele D, Nica A, De Montigny J, Raineteau O, Kalitzin S, Lopes da Silva F, Benquet P. Brain (Hyper)Excitability Revealed by Optimal Electrical Stimulation of GABAergic Interneurons. Brain Stimul 2016; 9:919-932. [PMID: 27576186 DOI: 10.1016/j.brs.2016.07.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 11/06/2015] [Revised: 04/29/2016] [Accepted: 07/10/2016] [Indexed: 10/21/2022] Open
Abstract
BACKGROUND Neurological disorders are often characterized by an excessive and prolonged imbalance between neural excitatory and inhibitory processes. An ubiquitous finding among these disorders is the disrupted function of inhibitory GABAergic interneurons. OBJECTIVE The objective is to propose a novel stimulation procedure able to evaluate the efficacy of inhibition imposed by GABAergic interneurons onto pyramidal cells from evoked responses observed in local field potentials (LFPs). METHODS Using a computational modeling approach combined with in vivo and in vitro electrophysiological recordings, we analyzed the impact of electrical extracellular, local, bipolar stimulation (ELBS) on brain tissue. We implemented the ELBS effects in a neuronal population model in which we can tune the excitation-inhibition ratio and we investigated stimulation-related parameters. Computer simulations led to sharp predictions regarding: i) the shape of evoked responses as observed in local field potentials, ii) the type of cells (pyramidal neurons and interneurons) contributing to these field responses and iii) the optimal tuning of stimulation parameters (intensity and frequency) to evoke meaningful responses. These predictions were tested in vivo (mouse). Neurobiological mechanisms were assessed in vitro (hippocampal slices). RESULTS Appropriately-tuned ELBS allows for preferential activation of GABAergic interneurons. A quantitative neural network excitability index (NNEI) is proposed. It is computed from stimulation-induced responses as reflected in local field potentials. NNEI was used in four patients with focal epilepsy. Results show that it can readily reveal hyperexcitable brain regions. CONCLUSION Well-tuned ELBS and NNEI can be used to locally probe brain regions and quantify the (hyper)excitability of the underlying brain tissue.
Collapse
Affiliation(s)
- F Wendling
- INSERM U1099, LTSI, Rennes, France; Université de Rennes 1, LTSI, Rennes, France.
| | - U Gerber
- Brain Research Institute, Zurich, Switzerland
| | | | - A Nica
- Neurology Department, Functional Explorations Department, Epilepsy Surgery Unit, CHU, Rennes, France
| | - J De Montigny
- INSERM U1099, LTSI, Rennes, France; Université de Rennes 1, LTSI, Rennes, France
| | - O Raineteau
- Brain Research Institute, Zurich, Switzerland
| | - S Kalitzin
- Foundation of Epilepsy Institutions of the Netherlands (SEIN), Heemstede, The Netherlands
| | - F Lopes da Silva
- Center of Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, The Netherlands
| | - P Benquet
- INSERM U1099, LTSI, Rennes, France; Université de Rennes 1, LTSI, Rennes, France
| |
Collapse
|
14
|
Mulvey MR, Fawkner HJ, Johnson MI. An Investigation of the Effects of Different Pulse Patterns of Transcutaneous Electrical Nerve Stimulation (TENS) on Perceptual Embodiment of a Rubber Hand in Healthy Human Participants With Intact Limbs. Neuromodulation 2015. [PMID: 26222512 DOI: 10.1111/ner.12329] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the strength of perceptual embodiment achieved during an adapted version of the rubber hand illusion (RHI) in response to a series of modified transcutaneous electrical nerve stimulation (TENS) pulse patterns with dynamic temporal and spatial characteristics which are more akin to the mechanical brush stroke in the original RHI. MATERIALS AND METHODS A repeated-measures counterbalanced experimental study was conducted where each participant was exposed to four TENS interventions: continuous pattern TENS; burst pattern TENS (fixed frequency of 2 bursts per second of 100 pulses per second); amplitude-modulated pattern TENS (intensity increasing from zero to a preset level, then back to zero again in a cyclical fashion); and sham (no current) TENS. Participants rated the intensity of the RHI using a three-item numerical rating scale (each item was ranked from 0 to 10). Friedman's analysis of ranks (one-factor repeated measure) was used to test the differences in perceptual embodiment between TENS innervations; alpha was set at p ≤ 0.05. RESULTS There were statistically significant differences in the intensity of misattribution and perceptual embodiment between sham and active TENS interventions, but no significant differences between the three active TENS conditions (amplitude-modulated TENS, burst TENS, and continuous TENS). Amplitude-modulated and burst TENS produced significantly higher intensity scores for misattribution sensation and perceptual embodiment compared with sham (no current) TENS, whereas continuous TENS did not. CONCLUSION The findings provide tentative, but not definitive, evidence that TENS parameters with dynamic spatial and temporal characteristics may produce more intense misattribution sensations and intense perceptual embodiment than parameters with static characteristics (e.g., continuous pulse patterns).
Collapse
Affiliation(s)
- Matthew R Mulvey
- Faculty of Health and Social Sciences, Leeds Beckett University, Leeds, UK.,Leeds Institute of Health Sciences, University of Leeds, Leeds, UK.,Leeds Pallium Research Group, Leeds, UK
| | - Helen J Fawkner
- Faculty of Health and Social Sciences, Leeds Beckett University, Leeds, UK.,Leeds Pallium Research Group, Leeds, UK
| | - Mark I Johnson
- Faculty of Health and Social Sciences, Leeds Beckett University, Leeds, UK.,Leeds Pallium Research Group, Leeds, UK
| |
Collapse
|
15
|
Manoharan C, Jothibas M, Jeyakumar SJ, Dhanapandian S. Structural, optical and electrical properties of Zr-doped In₂O₃ thin films. Spectrochim Acta A Mol Biomol Spectrosc 2015; 145:47-53. [PMID: 25766478 DOI: 10.1016/j.saa.2015.02.099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 11/11/2014] [Revised: 02/01/2015] [Accepted: 02/19/2015] [Indexed: 06/04/2023]
Abstract
Undoped and zirconium doped indium oxide (ZrIO) thin films were deposited on glass substrate at a substrate temperature of 450°C by spray pyrolysis method. The effect of zirconium (Zr) dopant concentration (0-11 at.%) on the structural, morphological, optical and electrical properties of n-type ZrIO films were studied. X-ray diffraction (XRD) results confirmed the polycrystalline nature of the ZrIO thin film with cubic structure. The grain size was decreased from 25 to 15.75 nm with Zr doping. The scanning electron microscopy (SEM) showed that the surface morphology of the films were changed with Zr doping. The surface roughness of the films was investigated by atomic force microscopy (AFM) and was found to be increased with the increasing of Zr doping percentage. A blue shift of the optical band gap was observed. The optical band was gap decreased from 3.50 to 3.0eV with increase in Zr concentrations. Room temperature photoluminescence (PL) measurement of the deposited films indicated the incorporation of Zr in In2O3 lattice. The film had low resistivity of 6.4 × 10(-4)Ωcm and higher carrier concentration of 2.5 × 10(20) was obtained at a doping ratio of 7 at.%.
Collapse
Affiliation(s)
- C Manoharan
- Department of Physics, Annamalai University, Annamalai Nagar 608 002, India
| | - M Jothibas
- Department of Physics, T.B.M.L. College, Porayar 609 307, India.
| | | | - S Dhanapandian
- Department of Physics, Annamalai University, Annamalai Nagar 608 002, India
| |
Collapse
|
16
|
Abstract
BACKGROUND Upper extremity electrical burns are a cause of major morbidity and disability in affected individuals. Anecdotally, we have noted changes in the presentation of cases to our institution. We sought to compare current data on upper extremity electrical burns in children with our previously published historical data. METHODS Using the Shriners Hospital Boston and American Burn Association databases, we retrospectively analyzed electrical upper extremity burns in patients aged 21 years or younger. Data regarding demographics, etiology, and reconstruction were collated and analyzed. RESULTS In our institutional cohort, patients were most commonly males (37/48, 77%) aged 10-15 years (19/48, 40%). We have seen a rise in the proportion of female, younger patients, with burns attributed to domestic wiring, indicative of a reduction in the number of high-voltage injuries in males due to demonstrations of bravado. High-voltage injuries correlate with severity of injury and tended to be transferred to our institution from foreign countries (9/48, 19%). We have also seen a reduction in the need to amputate extremities. CONCLUSIONS Changes in upper extremity electrical burn demographics and etiology since the 1970s may be indicative of effective education and safety campaigns. Consequently, reconstructive requirements have also changed. We hope that similar ongoing efforts in the developing world may bring about comparable positive results.
Collapse
Affiliation(s)
- Simon G. Talbot
- Division of Plastic Surgery, Shriners Hospital Boston, 51 Blossom Street, Boston, MA 02114 USA
| | - Joseph Upton
- Division of Plastic Surgery, Shriners Hospital Boston, 51 Blossom Street, Boston, MA 02114 USA
| | - Daniel N. Driscoll
- Division of Plastic Surgery, Shriners Hospital Boston, 51 Blossom Street, Boston, MA 02114 USA
| |
Collapse
|
17
|
Terziqi H, Krysander L. Case presentation - reconstruction of thumb defect with neurovascular cross-finger flap after electrical burns. Ann Burns Fire Disasters 2005; 18:161-3. [PMID: 21991000 PMCID: PMC3187991] [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] [Subscribe] [Scholar Register] [Received: 11/03/2004] [Indexed: 05/31/2023]
Abstract
The advantages are underlined of the use of the neurovascular flap, as seen in a patient with injuries in all anatomical structures after electrical burns, with defect in the soft tissue together with tendon, vessel, and nerve injuries and necrosis of the distal phalanx of the thumb, with reference to the value of this technique in modern plastic and reconstructive surgery.
Collapse
Affiliation(s)
- H Terziqi
- CUC, Surgery Clinic, Reconstructive and Plastic Surgery Department, Pristina, Kosova
| | | |
Collapse
|