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Sørensen DM, Bostock H, Abrahao A, Alaamel A, Alaydin HC, Ballegaard M, Boran E, Cengiz B, de Carvalho M, Dunker Ø, Fuglsang-Frederiksen A, Graffe CC, Jones KE, Kallio M, Kalra S, Krarup C, Krøigård T, Liguori R, Lupescu T, Maitland S, Matamala JM, Moldovan M, Moreno-Roco J, Nilsen KB, Phung L, Santos MO, Themistocleous AC, Uysal H, Vacchiano V, Whittaker RG, Zinman L, Tankisi H. Estimating motor unit numbers from a CMAP scan: Repeatability study on three muscles at 15 centres. Clin Neurophysiol 2023; 151:92-99. [PMID: 37236129 DOI: 10.1016/j.clinph.2023.04.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 01/04/2023] [Revised: 03/16/2023] [Accepted: 04/15/2023] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To assess the repeatability and suitability for multicentre studies of MScanFit motor unit number estimation (MUNE), which involves modelling compound muscle action potential (CMAP) scans. METHODS Fifteen groups in 9 countries recorded CMAP scans twice, 1-2 weeks apart in healthy subjects from abductor pollicis brevis (APB), abductor digiti minimi (ADM) and tibialis anterior (TA) muscles. The original MScanFit program (MScanFit-1) was compared with a revised version (MScanFit-2), designed to accommodate different muscles and recording conditions by setting the minimal motor unit size as a function of maximum CMAP. RESULTS Complete sets of 6 recordings were obtained from 148 subjects. CMAP amplitudes differed significantly between centres for all muscles, and the same was true for MScanFit-1 MUNE. With MScanFit-2, MUNE differed less between centres but remained significantly different for APB. Coefficients of variation between repeats were 18.0% for ADM, 16.8% for APB, and 12.1% for TA. CONCLUSIONS It is recommended for multicentre studies to use MScanFit-2 for analysis. TA provided the least variable MUNE values between subjects and the most repeatable within subjects. SIGNIFICANCE MScanFit was primarily devised to model the discontinuities in CMAP scans in patients and is less suitable for healthy subjects with smooth scans.
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Affiliation(s)
- D M Sørensen
- Department of Clinical Neurophysiology, Aarhus University Hospital, Denmark
| | - H Bostock
- UCL Queen Square Institute of Neurology, Queen Square, London, United Kingdom
| | - A Abrahao
- Department of Medicine, University of Toronto, Toronto, Canada
| | - A Alaamel
- Department of Neurology, Akdeniz University Hospital, Antalya, Turkey
| | - H C Alaydin
- Department of Neurology, Gazi University, Ankara, Turkey
| | - M Ballegaard
- Department of Clinical Neurology, Zealand University Hospital, Roskilde, Denmark
| | - E Boran
- Department of Neurology, Gazi University, Ankara, Turkey
| | - B Cengiz
- Department of Neurology, Gazi University, Ankara, Turkey
| | - M de Carvalho
- Faculty of Medicine, iMM, Centro de Estudos Egas Moniz, Universidade de Lisboa, Department of Neurosciences and Mental Health, CHULN, Lisbon, Portugal
| | - Ø Dunker
- Department of Neurology and Department of Research and Innovation, Division of Clinical Neuroscience, Oslo University Hospital, Norway
| | - A Fuglsang-Frederiksen
- Department of Clinical Neurophysiology, Aarhus University Hospital, Denmark; Department of Clinical Institute, Aarhus University, Aarhus, Denmark
| | - C C Graffe
- Department of Clinical Neurophysiology, Rigshospitalet, Copenhagen, Denmark
| | - K E Jones
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Canada
| | - M Kallio
- Department of Clinical Neurophysiology, Oulu University Hospital, Oulu, Finland
| | - S Kalra
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Canada
| | - C Krarup
- Department of Clinical Neurophysiology, Rigshospitalet, Copenhagen, Denmark
| | - T Krøigård
- Department of Neurology, Odense University Hospital, Denmark
| | - R Liguori
- Dipertimento di Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, Italy
| | - T Lupescu
- Department of Neurology, Agrippa Ionescu Hospital, Bucharest, Romania
| | - S Maitland
- Translational and Clinical Research Institute, Newcastle University, United Kingdom
| | - J M Matamala
- Translational Neurology and Neurophysiology Lab, Department of Neurological Sciences and Biomedical Neuroscience Institute, University of Chile, Santiago, Chile
| | - M Moldovan
- Department of Clinical Neurophysiology, Rigshospitalet, Copenhagen, Denmark
| | - J Moreno-Roco
- Translational Neurology and Neurophysiology Lab, Department of Neurological Sciences and Biomedical Neuroscience Institute, University of Chile, Santiago, Chile
| | - K B Nilsen
- Department of Neurology and Department of Research and Innovation, Division of Clinical Neuroscience, Oslo University Hospital, Norway
| | - L Phung
- Department of Medicine, University of Toronto, Toronto, Canada
| | - M O Santos
- Faculty of Medicine, iMM, Centro de Estudos Egas Moniz, Universidade de Lisboa, Department of Neurosciences and Mental Health, CHULN, Lisbon, Portugal
| | - A C Themistocleous
- Nuffield Department of Clinical Neurosciences University of Oxford, Oxford, United Kingdom
| | - H Uysal
- Department of Medicine, University of Toronto, Toronto, Canada
| | - V Vacchiano
- Dipertimento di Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, Italy
| | - R G Whittaker
- Translational and Clinical Research Institute, Newcastle University, United Kingdom
| | - L Zinman
- UCL Queen Square Institute of Neurology, Queen Square, London, United Kingdom
| | - H Tankisi
- Department of Clinical Neurophysiology, Aarhus University Hospital, Denmark; Department of Clinical Institute, Aarhus University, Aarhus, Denmark.
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2
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Zehan IG, Andrei MG, Coseriu G, Eotvos CA, Lazar RD, Jelnean M, Tentea CP, Porca AD, Negru A, Burde A, Moldovan M, Chiorescu R, Pop S, Heist EK, Blendea D. The veins of the left ventricular summit in patients undergoing cardiac resynchronization therapy. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
While the coronary sinus and its left ventricular branches have been extensively described, the veins of the left ventricle summit (LVS) have been much less studied. The emergence of new ablation techniques for ventricular tachycardias, which make use of the LVS veins, has generated a renewed interest in the anatomy of these venous conduits.
Purpose
The aim of the study was to describe in detail the anatomy of the LVS veins using rotational venous angiography.
Material and methods
All patients (N=106, age 68±12 years, 72 men) underwent coronary venous angiography during the cardiac resynchronization implant procedures.
Results
The LVS veins identified were the great cardiac vein (GCV), the anterior interventricular vein (AIV) and the mitro-aortic LVS vein (MALVSV). The MALSV emerged from the GCV between 12 and 2 o'clock on the mitral ring, coursed inside the left atrioventricular groove, towards the aorto-mitral continuity (AMC), where it turned towards the ventricular septum and coursed parallel to the AIV, tapered down and ended at midventricular level. Most of the course of this vein was in the region of the LVS. The diameter of the venous conduit at the GCV-AIV junction was 4.9±1.0 mm. The MALVSV was present in 76 patients (72%; Figure 1). The MALVSV diameter was 2.4±0.6mm at the ostium (Figure 2) and 1.8±2.0 mm at the AMC. The takeoff angle was 134±27°. The total length of the vein was 34±16 mm, of which 23±14mm were inside the AV groove and 11±9mm, were along the ventricular septum. The length of the MALSV segment embedded in the left AV groove as well as the total length of MALSV correlated significantly with the left atrial diameter (r=0.44; P=0.040 and r=0.45; p=0.016 respectively) as well as with the right ventricular systolic pressure (r=0.50; p=0.028 and r=0.57; P=0.030 respectively).
Conclusions
This study brings new insights into the angiographic anatomy of the LVS veins. Detailed knowledge of these venous tributaries could help with the development of new strategies for ablation of LVS tachycardias.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- I G Zehan
- Iuliu Hatieganu University of Medicine and Pharmacy , Cluj Napoca , Romania
| | - M G Andrei
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - G Coseriu
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - C A Eotvos
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - R D Lazar
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - M Jelnean
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - C P Tentea
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - A D Porca
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - A Negru
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - A Burde
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - M Moldovan
- Heart Institute Nicolae Stancioiu , Cluj Napoca , Romania
| | - R Chiorescu
- University of Medicine and Pharmacy of Cluj Napoca , Cluj Napoca , Romania
| | - S Pop
- Clinic Medical I of Cluj-Napoca , Cluj Napoca , Romania
| | - E K Heist
- Massachusetts General Hospital , Boston , United States of America
| | - D Blendea
- Iuliu Hatieganu University of Medicine and Pharmacy , Cluj Napoca , Romania
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3
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Burghele BD, Botoș M, Beldean-Galea S, Cucoș A, Catalina T, Dicu T, Dobrei G, Florică Ș, Istrate A, Lupulescu A, Moldovan M, Niță D, Papp B, Pap I, Szacsvai K, Sainz C, Tunyagi A, Țenter A. Comprehensive survey on radon mitigation and indoor air quality in energy efficient buildings from Romania. Sci Total Environ 2021; 751:141858. [PMID: 32892081 DOI: 10.1016/j.scitotenv.2020.141858] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/05/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
Over the last 10 years applied scientific research has been carried out in Romania to tacked the residential radon issues. The increased interest to reduce the carbon footprint of buildings has lead to the implementation and use of new architectural solutions aimed to save energy in houses and other buildings. As a consequence, the degree of retrofit in existing buildings and energy efficiency of new buildings promoted the need to not only mitigate indoor radon, but improve indoor air quality overall. The present study found that the while the best performance in radon reduction was confirmed to be based on sub-slab depressurization (61% - 95% reduction), centralized and decentralized mechanical supply and exhaust ventilation with heat recovery yielded a good efficiency in overall improvement of indoor air quality (CO2, VOC, RH, temperature). The outcome of our research, as well as future perspectives, take into account the recommended harmonization of energy efficiency programs with those of public health by finding and applying the best technologies in compliance with energy saving and indoor environmental quality.
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Affiliation(s)
- B D Burghele
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - M Botoș
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Faculty of Civil Engineering, Tehnical University of Cluj-Napoca, Str. C. Daicoviciu 15, Cluj-Napoca, Romania
| | - S Beldean-Galea
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - A Cucoș
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania.
| | - T Catalina
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Faculty of Engineering Installations, Technical University of Civil Engineering of Bucharest, Bld. P. Protopopescu 66, Bucharest, Romania
| | - T Dicu
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - G Dobrei
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - Ș Florică
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Faculty of Biology and Geology, Department of Geology, "Babeş-Bolyai" University, Str. M. Kogalniceanu 1, Cluj-Napoca, Romania
| | - A Istrate
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Clima Instal Systems SRL, Str. Prunilor nr. 15, Oras Pantelimon, ILFOV
| | - A Lupulescu
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - M Moldovan
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - D Niță
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - B Papp
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - I Pap
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - K Szacsvai
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
| | - C Sainz
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Department of Medical Physics, Faculty of Medicine, University of Cantabria, c/ Herrera Oria s/n, 39011 Santander, Spain
| | - A Tunyagi
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania; Faculty of Physics, "Babeş-Bolyai" University, Str. M. Kogălniceanu 1, Cluj-Napoca, Romania
| | - A Țenter
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, Str. Fântânele 30, Cluj-Napoca, Romania
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4
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Jørgensen HS, Jensen DB, Dimintiyanova KP, Bonnevie VS, Hedegaard A, Lehnhoff J, Moldovan M, Grondahl L, Meehan CF. Increased Axon Initial Segment Length Results in Increased Na + Currents in Spinal Motoneurones at Symptom Onset in the G127X SOD1 Mouse Model of Amyotrophic Lateral Sclerosis. Neuroscience 2020; 468:247-264. [PMID: 33246068 DOI: 10.1016/j.neuroscience.2020.11.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 04/06/2020] [Revised: 10/22/2020] [Accepted: 11/10/2020] [Indexed: 12/13/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease preferentially affecting motoneurones. Transgenic mouse models have been used to investigate the role of abnormal motoneurone excitability in this disease. Whilst an increased excitability has repeatedly been demonstrated in vitro in neonatal and embryonic preparations from SOD1 mouse models, the results from the only studies to record in vivo from spinal motoneurones in adult SOD1 models have produced conflicting findings. Deficits in repetitive firing have been reported in G93A SOD1(high copy number) mice but not in presymptomatic G127X SOD1 mice despite shorter motoneurone axon initial segments (AISs) in these mice. These discrepancies may be due to the earlier disease onset and prolonged disease progression in G93A SOD1 mice with recordings potentially performed at a later sub-clinical stage of the disease in this mouse. To test this, and to explore how the evolution of excitability changes with symptom onset we performed in vivo intracellular recording and AIS labelling in G127X SOD1 mice immediately after symptom onset. No reductions in repetitive firing were observed showing that this is not a common feature across all ALS models. Immunohistochemistry for the Na+ channel Nav1.6 showed that motoneurone AISs increase in length in G127X SOD1 mice at symptom onset. Consistent with this, the rate of rise of AIS components of antidromic action potentials were significantly faster confirming that this increase in length represents an increase in AIS Na+ channels occurring at symptom onset in this model.
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Affiliation(s)
- H S Jørgensen
- Department of Neuroscience, University of Copenhagen, Denmark
| | - D B Jensen
- Department of Neuroscience, University of Copenhagen, Denmark
| | | | - V S Bonnevie
- Department of Neuroscience, University of Copenhagen, Denmark
| | - A Hedegaard
- Department of Neuroscience, University of Copenhagen, Denmark
| | - J Lehnhoff
- Department of Neuroscience, University of Copenhagen, Denmark
| | - M Moldovan
- Department of Neuroscience, University of Copenhagen, Denmark
| | - L Grondahl
- Department of Neuroscience, University of Copenhagen, Denmark
| | - C F Meehan
- Department of Neuroscience, University of Copenhagen, Denmark.
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5
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Bonnevie VS, Dimintiyanova KP, Hedegaard A, Lehnhoff J, Grøndahl L, Moldovan M, Meehan CF. Shorter axon initial segments do not cause repetitive firing impairments in the adult presymptomatic G127X SOD-1 Amyotrophic Lateral Sclerosis mouse. Sci Rep 2020; 10:1280. [PMID: 31992746 PMCID: PMC6987224 DOI: 10.1038/s41598-019-57314-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 07/29/2019] [Accepted: 12/19/2019] [Indexed: 12/13/2022] Open
Abstract
Increases in axonal sodium currents in peripheral nerves are some of the earliest excitability changes observed in Amyotrophic Lateral Sclerosis (ALS) patients. Nothing is known, however, about axonal sodium channels more proximally, particularly at the action potential initiating region - the axon initial segment (AIS). Immunohistochemistry for Nav1.6 sodium channels was used to investigate parameters of AISs of spinal motoneurones in the G127X SOD1 mouse model of ALS in adult mice at presymptomatic time points (~190 days old). In vivo intracellular recordings from lumbar spinal motoneurones were used to determine the consequences of any AIS changes. AISs of both alpha and gamma motoneurones were found to be significantly shorter (by 6.6% and 11.8% respectively) in G127X mice as well as being wider by 9.8% (alpha motoneurones). Measurements from 20–23 day old mice confirmed that this represented a change during adulthood. Intracellular recordings from motoneurones in presymptomatic adult mice, however, revealed no differences in individual action potentials or the cells ability to initiate repetitive action potentials. To conclude, despite changes in AIS geometry, no evidence was found for reduced excitability within the functional working range of firing frequencies of motoneurones in this model of ALS.
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Affiliation(s)
- V S Bonnevie
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - K P Dimintiyanova
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - A Hedegaard
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - J Lehnhoff
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - L Grøndahl
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - M Moldovan
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark
| | - C F Meehan
- Department of Neuroscience, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK-2200, Copenhagen N, Denmark.
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6
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Burghele B, Ţenter A, Cucoş A, Dicu T, Moldovan M, Papp B, Szacsvai K, Neda T, Suciu L, Lupulescu A, Maloş C, Florică Ş, Baciu C, Sainz C. The FIRST large-scale mapping of radon concentration in soil gas and water in Romania. Sci Total Environ 2019; 669:887-892. [PMID: 30897444 DOI: 10.1016/j.scitotenv.2019.02.342] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/12/2019] [Accepted: 02/21/2019] [Indexed: 06/09/2023]
Abstract
In the framework of the last Council Directive 2013/59 (Euratom, 2014) laying down basic safety standards for protection against the dangers arising from exposure to ionizing radiation, the problem of radon was assumed in Romania at national level by responsible authorities through the design and development of a National Radon Action Plan and an adequate legislation (HG nr. 526/2018). In order to identify radon risk areas, however, it is necessary to perform systematic radon measurements in different environmental media (soil gas, water, indoor air) and to map the results. This paper presents an atlas of up-to-date radon in soil and water levels for central and western part of Romania. The radon in soil map includes data from 2564 measurements carried out on-site, using Luk3C radon detector. The Luk-VR system was used to measure radon activity concentration from 2452 samples of drinking water. The average radon activity concentration was 29.3 kBq m-3 for soil gas, respectively 9.8 Bq l-1 for water dissolved air. Mapping of radon can be a useful tool to implement radon policies at both the national and local levels, defining priority areas for further study when land-use decisions must be made.
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Affiliation(s)
- B Burghele
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - A Ţenter
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania.
| | - A Cucoş
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - T Dicu
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - M Moldovan
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - B Papp
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - K Szacsvai
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania; Sapientia University, Faculty of Sciences and Arts, Calea Turzii, Street no. 4, 400193 Cluj-Napoca, Romania
| | - T Neda
- Sapientia University, Faculty of Sciences and Arts, Calea Turzii, Street no. 4, 400193 Cluj-Napoca, Romania
| | - L Suciu
- I.C.P.E. BISTRITA SA, Parcului street no. 7C, Bistriţa, Romania
| | - A Lupulescu
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - C Maloş
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - Ş Florică
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania; Faculty of Biology and Geology, Department of Geology, "Babeş-Bolyai" University, Mihail Kogalniceanu Street, no. 1, 400084 Cluj-Napoca, Romania
| | - C Baciu
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania
| | - C Sainz
- "Constantin Cosma" Radon Laboratory (LiRaCC), Faculty of Environmental Science and Engineering, "Babeş-Bolyai" University, s. no. 30, 400294 Cluj-Napoca, Romania; Department of Medical Physics, Faculty of Medicine, University of Cantabria, c/ Herrera Oria s/n, 39011 Santander, Spain
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7
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Mârza SM, Magyari K, Bogdan S, Moldovan M, Peştean C, Nagy A, Tăbăran F, Licarete E, Suarasan S, Dreanca A, Baia L, Papuc I. Skin wound regeneration with bioactive glass-gold nanoparticles ointment. ACTA ACUST UNITED AC 2019; 14:025011. [PMID: 30630137 DOI: 10.1088/1748-605x/aafd7d] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The bioactive glasses can lead to the promotion of growth of granulation tissue, while the gold nanoparticles (AuNPs) can induce the acceleration of wound healing including tissue regeneration, connective tissue formation, and angiogenesis. The aim of this study was to evaluate the impact of using the bioactive glass (BG) and BG-AuNPs composites on skin wound healing in experimental rat models for 14 days. Sol-gel derived BGs and BG-AuNPs composites mixed with Vaseline at 6, 12 and 18 wt% were used to evaluate the repair response of the skin. During the process of healing, granulomatous reaction was observed in the wound treated with 12 and 18 wt% BG-Vaseline ointments. Furthermore, a strong vascular proliferation and complete wound regeneration were found in 18%BG-AuNPs-Vaseline treated groups. The results derived from the performed investigations revealed that the 18% BG-AuNPs-Vaseline ointment is a promising candidate for wound healing applications.
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Affiliation(s)
- S M Mârza
- Faculty of Veterinary Medicine, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania. Faculty of Physics, Babeș-Bolyai University, 400084 Cluj-Napoca, Romania
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Soancă A, Lupse M, Moldovan M, Pall E, Cenariu M, Roman A, Tudoran O, Surlin P, Șorițău O. Applications of inflammation-derived gingival stem cells for testing the biocompatibility of dental restorative biomaterials. Ann Anat 2018; 218:28-39. [PMID: 29604386 DOI: 10.1016/j.aanat.2018.02.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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: 07/27/2017] [Revised: 01/24/2018] [Accepted: 02/12/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Normal or inflamed gingival tissues are regarded as a source of mesenchymal stem cells (MSCs) abundant and easily accessible through minimally invasive dental procedures. Due to the proximity of dental resin composites to gingival tissues and to the possible local cytotoxic effect of the eluted components, gingiva-derived MSCs could be used to investigate the biocompatibility of dental biomaterials. PURPOSE The present research aimed to isolate (MSCs) from inflamed and normal gingiva, to fully characterize them and to observe their behavior in relation with some commercial resin composite materials and one experimental material. MATERIAL AND METHODS Following their isolation, putative MSCs from both gingival sources were grown under the same culture conditions and characterized by immunophenotyping of cell surface antigens by flow-cytometry and transcription factors by immunocytochemical staining. Moreover, stemness gene expression was evaluated by RT-PCR analysis. Multipotent mesenchymal differentiation potential was investigated. Osteogenic and neurogenic differentiated cells were highlighted by immunocytochemical staining, chondrogenic cells by cytochemical staining, and adipocytes by cytochemical staining and spectrophotometry, respectively. Resin composite cytotoxicity was evaluated by cell membrane fluorescent labeling with PKH 26 and MTT assay. The results of PKH labeling were statistically analysed using two-way RM ANOVA with Bonferroni post-tests. For MTT assay, two-way RM ANOVA with Bonferroni post-tests and unpaired t test with Welch's correction were used. RESULTS A similar expression pattern of surface markers was observed. The cells were positive for CD105, CD73, CD90, CD49e, CD29, CD44 and CD166 and negative for CD45, CD34, CD14, CD79, HLA-DR and CD117 indicating a mesenchymal stem cell phenotype. The qRT-PCR analysis revealed a low gene expression for NOG, BMP4 and Oct3/4 and an increased expression for Nanog in both cells lines. Immunocytochemical analysis highlighted a more intense protein expression for Nanog, Oct3/4 and Sox-2 in MSCs derived from normal gingiva than from inflamed gingiva. Multipotent differentiation capacity of MSCs isolated from both sources was highlighted. The tested materials had no hazardous effect on MSCs as the two cell lines developed well onto resin composite substrates. Cell counting revealed some significant differences in the number of PKH-labeled MSCs at some experimental moments. Also, some differences in cell viability were recorded indicating better developmental conditions offered by some of the tested biomaterials. CONCLUSIONS The experimental resin composite behaved like the most biocompatible commercial material. Inflamed gingiva-derived MSCs retain their stem cell properties and could be used as a valuable cell line for testing dental biomaterials.
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Affiliation(s)
- A Soancă
- Department of Periodontology, Faculty of Dental Medicine, Iuliu Haţieganu University of Medicine and Pharmacy, 15 V. Babeş St., 400012 Cluj-Napoca, Romania
| | - M Lupse
- Department of Infectious Diseases, Faculty of Medicine, Iuliu Haţieganu University of Medicine and Pharmacy, 23 Iuliu Moldovan St., 400349 Cluj-Napoca, Romania
| | - M Moldovan
- Raluca Ripan Institute for Research in Chemistry, Babes-Bolyai University, 30 Fântânele St., 400294 Cluj-Napoca, Romania
| | - E Pall
- Department of Veterinary Reproduction, Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, 3-5 Mănăştur St., 400372 Cluj-Napoca, Romania
| | - M Cenariu
- Department of Veterinary Reproduction, Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, 3-5 Mănăştur St., 400372 Cluj-Napoca, Romania
| | - A Roman
- Department of Periodontology, Faculty of Dental Medicine, Iuliu Haţieganu University of Medicine and Pharmacy, 15 V. Babeş St., 400012 Cluj-Napoca, Romania.
| | - O Tudoran
- Department of Functional Genomics and Experimental Pathology, Prof. Dr. Ion Chiricuţă Oncology Institute, 34-36 Republicii St., 400015 Cluj-Napoca, Romania
| | - P Surlin
- Department of Periodontology, University of Medicine and Pharmacy, 2 Petru Rareş St., 200349 Craiova, Romania
| | - O Șorițău
- Laboratory of Radiotherapy, Tumor and Radiobiology, Prof. Dr. Ion Chiricuţă Oncology Institute, 34-36 Republicii St., 400015 Cluj-Napoca, Romania
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Saplontai-Pop A, Moldovan M, Filip M, Oprean R, Ionescu C, Lazar Leordean V, Orasan O, Baldea I. Thiosulfinate Compounds from Allium cepa Extracts: Chromatographic Identification and Biocompatibility Testing. Chem Nat Compd 2017. [DOI: 10.1007/s10600-017-2189-7] [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: 11/28/2022]
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10
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Orăşan O, Oprean R, Saplonţai-Pop A, Filip M, Carpa R, Saroşi C, Moldovan M, Man S. Antimicrobial activity and thiosulfinates profile of a formulation based on Allium cepa L. extract. OPEN CHEM 2017. [DOI: 10.1515/chem-2017-0021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractBackgroundAllium species extracts including Allium cepa L. contain sulfur compounds, known for their antiplatelet, antimicrobial, antineoplasic activities.MethodologyAntibacterial activity of a formulation based on A. cepa extracts-liquid and lyophilized samples, has been demonstrated using two classes of bacteria: Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) and three methods: discs soaked with liquid extract, the wells method in the culture medium, filled with the liquid extract and lyophilized formulation extracts transformed by the incorporation of ultrapure water. The second part of this study includes identification of thiosulfinates compounds from the studied samples by high performance liquid chromatography - mass spectrometry (HPLC-MS).ResultsThe most important inhibition and the highest antibacterial effficiency were observed against Gram-positive bacteria, such as Staphylococcus aureus. The HPLC-MS thiosulfinates profile of the tested formulation extracts shows the presence of seven thiosulfinate compounds, MeS(O)S 1-propenyl (E,Z); n-PrS(O)S 1-propenyl-(E); n-PrS(O)S 1-propenyl-(Z); trans-zwiebelane; n-PrS(O)CHEtSS-1propenyl; 1-propenylS(O)CHEtSS1-propenyl, which may be responsible for antibacterial activity.ConclusionTesting antimicrobial effects using the three mentioned methods confirmed the antimicrobial activity of the tested samples based on A. cepa extracts, with a demonstrated content of seven thiosulfinate compounds.
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Affiliation(s)
- O. Orăşan
- 4th Medical Clinic, “Iuliu Haţieganu” University of Medicine and Pharmacy, 16-20 Republicii street, Cluj-Napoca, Romania, 400015
| | - R. Oprean
- Department of Analytical Chemistry, “Iuliu Haţieganu” University of Medicine and Pharmacy, 6 Louis Pasteur street, Cluj-Napoca, Romania, 400349
| | - A. Saplonţai-Pop
- Department of Cardiology, Municipal Clinical Hospital, 11 Tabacarilor street, Cluj-Napoca, Romania, 400139
| | - M. Filip
- “Raluca Ripan” Institute for Research in Chemistry, 30 Fântânele street, “Babeş-Bolyai” University, Cluj-Napoca, Romaina, 400294
| | - R. Carpa
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology, „Babeş-Bolyai“ University, Kogălniceanu street, Cluj-Napoca, Romania, 400084
| | - C. Saroşi
- “Raluca Ripan” Institute for Research in Chemistry, 30 Fântânele street, “Babeş-Bolyai” University, Cluj-Napoca, Romaina, 400294
| | - M. Moldovan
- “Raluca Ripan” Institute for Research in Chemistry, 30 Fântânele street, “Babeş-Bolyai” University, Cluj-Napoca, Romaina, 400294
| | - S.C. Man
- Mother and Child Department, 3rd Department of Paediatrics, “Iuliu Haţieganu” University of Medicine and Pharmacy, Cluj-Napoca, Romania
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Dent E, Hoogendijk E, Moldovan M. FRAILTY INDEX BASED ON CLINICAL LABORATORY MEASURES (FI-LAB) ASSOCIATES WITH TELOMERE LENGTH. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2171] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- E. Dent
- Centre for Research in Geriatric Medicine, The University of Queensland, Woolloongabba, Queensland, Australia,
| | - E.O. Hoogendijk
- Department of Epidemiology and Biostatistics, VU University Medical Center, EMGO+ Institute for Health and Care Research, Amsterdam, Netherlands,
| | - M. Moldovan
- University of South Australia, Adelaide, South Australia, Australia
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12
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Moldovan M, Prejmerean C, Prodan D, Dumitrescu LS, Carpa R, Pruneanu S, Sarosi C. Antibacterial activity and flexural strength for experimental composites with graphene. Dent Mater 2017. [DOI: 10.1016/j.dental.2017.08.107] [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: 11/30/2022]
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Mahurkar S, Moldovan M, Suppiah V, Sorosina M, Clarelli F, Liberatore G, Malhotra S, Montalban X, Antigüedad A, Krupa M, Jokubaitis VG, McKay FC, Gatt PN, Fabis-Pedrini MJ, Martinelli V, Comi G, Lechner-Scott J, Kermode AG, Slee M, Taylor BV, Vandenbroeck K, Comabella M, Boneschi FM, King C. Response to interferon-beta treatment in multiple sclerosis patients: a genome-wide association study. Pharmacogenomics J 2016; 17:312-318. [PMID: 27001119 DOI: 10.1038/tpj.2016.20] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 11/04/2015] [Accepted: 02/12/2016] [Indexed: 01/23/2023]
Abstract
Up to 50% of multiple sclerosis (MS) patients do not respond to interferon-beta (IFN-β) treatment and determination of response requires lengthy clinical follow-up of up to 2 years. Response predictive genetic markers would significantly improve disease management. We aimed to identify IFN-β treatment response genetic marker(s) by performing a two-stage genome-wide association study (GWAS). The GWAS was carried out using data from 151 Australian MS patients from the ANZgene/WTCCC2 MS susceptibility GWAS (responder (R)=51, intermediate responders=24 and non-responders (NR)=76). Of the single-nucleotide polymorphisms (SNP) that were validated in an independent group of 479 IFN-β-treated MS patients from Australia, Spain and Italy (R=273 and NR=206), eight showed evidence of association with treatment response. Among the replicated associations, the strongest was observed for FHIT (Fragile Histidine Triad; combined P-value 6.74 × 10-6) and followed by variants in GAPVD1 (GTPase activating protein and VPS9 domains 1; combined P-value 5.83 × 10-5) and near ZNF697 (combined P-value 8.15 × 10-5).
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Affiliation(s)
- S Mahurkar
- School of Pharmacy and Medical Sciences and Sansom Institute for Health Research, University of South Australia, Frome Road, Adelaide, South Australia, Australia
| | - M Moldovan
- South Australian Health &Medical Research Institute and Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia.,Australian Institute of Health Innovation, University of New South Wales, Sydney, Australia
| | - V Suppiah
- School of Pharmacy and Medical Sciences and Sansom Institute for Health Research, University of South Australia, Frome Road, Adelaide, South Australia, Australia
| | - M Sorosina
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
| | - F Clarelli
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
| | - G Liberatore
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy.,Department of Neurology and Neurorehabilitation, San Raffaele Scientific Institute, Milan, Italy
| | - S Malhotra
- Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya (Cemcat), Institut de Receca Vall d'Hebron (VHIR), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - X Montalban
- Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya (Cemcat), Institut de Receca Vall d'Hebron (VHIR), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - A Antigüedad
- Servicio de Neurología, Basurto Hospital, Bilbao, Spain
| | - M Krupa
- Flinders University and Medical Centre, Adelaide, South Australia, Australia
| | - V G Jokubaitis
- Department of Medicine (Royal Melbourne Hospital), The University of Melbourne, Parkville, Victoria, Australia
| | - F C McKay
- Centre for Immunology and Allergy Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia
| | - P N Gatt
- Centre for Immunology and Allergy Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia
| | - M J Fabis-Pedrini
- Western Australian Neuroscience Research Institute, Centre for Neuromuscular and Neurological Disorders, University of WA, Nedlands, Western Australia, Australia
| | - V Martinelli
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
| | - G Comi
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy.,Department of Neurology and Neurorehabilitation, San Raffaele Scientific Institute, Milan, Italy
| | - J Lechner-Scott
- Hunter Medical Research Institute, The University of Newcastle, Newcastle, New South Wales, Australia
| | - A G Kermode
- Western Australian Neuroscience Research Institute, Centre for Neuromuscular and Neurological Disorders, University of WA, Nedlands, Western Australia, Australia.,Institute of Immunology and Infectious Diseases, Murdoch University, Western Australia, Australia
| | - M Slee
- Flinders University and Medical Centre, Adelaide, South Australia, Australia
| | - B V Taylor
- Menzies Institute for Medical Research, University of Tasmania, Tasmania, Australia
| | - K Vandenbroeck
- Neurogenomiks Group, Universidad del País Vasco (UPV/EHU), Leioa, Spain.,Achucarro Basque Center for Neuroscience, Zamudio, Spain.,Ikerbasque, Basque Foundation of Science, Bilbao, Spain
| | - M Comabella
- Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya (Cemcat), Institut de Receca Vall d'Hebron (VHIR), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - F M Boneschi
- Laboratory of Genetics of Complex Neurological Disorders, Institute of Experimental Neurology, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy.,Department of Neurology and Neurorehabilitation, San Raffaele Scientific Institute, Milan, Italy
| | | | - C King
- School of Pharmacy and Medical Sciences and Sansom Institute for Health Research, University of South Australia, Frome Road, Adelaide, South Australia, Australia
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Chisnoiu R, Moldovan M, Păstrav O, Delean A, Chisnoiu AM. The influence of three endodontic sealers on bone healing: an experimental study. Folia Morphol (Warsz) 2015; 75:14-20. [PMID: 26383505 DOI: 10.5603/fm.a2015.0079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 03/31/2015] [Revised: 06/28/2015] [Accepted: 06/29/2015] [Indexed: 11/25/2022]
Abstract
BACKGROUND The aim of this experimental study is to assess the bone healing phenomenon produced in the presence of 3 dental materials used for the root canal obturation. MATERIALS AND METHODS The biocompatibility of 3 endodontic sealers (a self-curing epoxy resin - AH Plus, a dual cure urethane dimethacrylate resin - RealSeal and a new dual cure endodontic hydroxyapatite based filling material) was investigated after intra-osseous implantation of the materials in rats' calvaria. Tissue reaction was studied at 2, 4, 6, 8, 10 and 12 weeks after implantation using calibrated image retrieval by Olympus. We took into consideration the presence of inflammatory cells (polymorphonuclear leukocytes, macrophages, plasma cells, lymphocytes and giant cells) and classified the aspects of the histological samples according to the following scale: 0 - no inflammation, 1 - mild, isolated inflammation, 2 - moderate, localised inflammatory reaction, 3 - severe, diffuse and intense inflammatory reaction. RESULTS The inflammatory reaction was present at the 6 intervals for all the tested materials, but a decrease of the inflammatory infiltrate, statistically significant, until extinction for all tested materials was observed at the end of the experimental period. The reaction of bone tissue recovery was most intense in the case of the control area. Lower intensity osteogenesis phenomenon was observed in case of all 3 tested sealers at the end of the experimental period. CONCLUSIONS Biocompatibility and bone healing induction of the new hydroxyapatite based endodontic filling material is comparable to other commercial materials, AH Plus and RealSeal.
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Affiliation(s)
- R Chisnoiu
- Department of Odontology, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania.
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Hedegaard A, Lehnhoff J, Moldovan M, Grøndahl L, Petersen NC, Meehan CF. Postactivation depression of the Ia EPSP in motoneurons is reduced in both the G127X SOD1 model of amyotrophic lateral sclerosis and in aged mice. J Neurophysiol 2015; 114:1196-210. [PMID: 26084911 DOI: 10.1152/jn.00745.2014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 09/26/2014] [Accepted: 06/17/2015] [Indexed: 12/14/2022] Open
Abstract
Postactivation depression (PActD) of Ia afferent excitatory postsynaptic potentials (EPSPs) in spinal motoneurons results in a long-lasting depression of the stretch reflex. This phenomenon (PActD) is of clinical interest as it has been shown to be reduced in a number of spastic disorders. Using in vivo intracellular recordings of Ia EPSPs in adult mice, we demonstrate that PActD in adult (100-220 days old) C57BL/6J mice is both qualitatively and quantitatively similar to that which has been observed in larger animals with respect to both the magnitude (with ∼20% depression of EPSPs at 0.5 ms after a train of stimuli) and the time course (returning to almost normal amplitudes by 5 ms after the train). This validates the use of mouse models to study PActD. Changes in such excitatory inputs to spinal motoneurons may have important implications for hyperreflexia and/or glutamate-induced excitotoxicity in the neurodegenerative disease amyotrophic lateral sclerosis (ALS). With the use of the G127X SOD1 mutant mouse, an ALS model with a prolonged asymptomatic phase and fulminant symptom onset, we observed that PActD is significantly reduced at both presymptomatic (16% depression) and symptomatic (17.3% depression) time points compared with aged-matched controls (22.4% depression). The PActD reduction was not markedly altered by symptom onset. Comparing these PActD changes at the EPSP with the known effect of the depression on the monosynaptic reflex, we conclude that this is likely to have a much larger effect on the reflex itself (a 20-40% difference). Nevertheless, it should also be accounted that in aged (580 day old) C57BL/6J mice there was also a reduction in PActD although, aging is not usually associated with spasticity.
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Affiliation(s)
- A Hedegaard
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and
| | - J Lehnhoff
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and
| | - M Moldovan
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and
| | - L Grøndahl
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and
| | - N C Petersen
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and Department of Nutrition, Exercise and Sports, University of Copenhagen, Panum Institute, Copenhagen, Denmark
| | - C F Meehan
- Department of Neuroscience and Pharmacology, University of Copenhagen, Panum Institute, Copenhagen, Denmark; and
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Voicu M, Charpentier A, Moldovan M, Duchene F. Une hémoglobinurie paroxystique nocturne bien curieuse. Rev Med Interne 2015. [DOI: 10.1016/j.revmed.2015.03.166] [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: 11/25/2022]
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Philippe L, Voicu M, Katringer E, Moldovan M, Deconinck E, Duchene F. Pseudo-microangiopathie : diagnostic à ne pas manquer ! Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.10.329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Moldovan M, Benea V, Niţă DC, Papp B, Burghele BD, Bican-Brişan N, Cosma C. Radon and radium concentration in water from North-West of Romania and the estimated doses. Radiat Prot Dosimetry 2014; 162:96-100. [PMID: 25031036 DOI: 10.1093/rpd/ncu230] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In the present study, the measurements of radon were carried out using the LUK-VR system based on radon gas measurements with Lucas cells. The radium concentration in water was determined, with the same device, immediately after was established the radon equilibrium with radium. The results presented here are from a survey carried out in the N-W region of Transylvania (Romania) in which were investigated the radon concentrations in natural (spring, well and surface) and drinking (tap) waters. The results showed radon concentrations within the range of 0.4-187.3 Bq l(-1) with an average value of 15.9 Bq l(-1) whereas radium concentration varied between 0.05 and 0.825 Bq l(-1) with an average value of 0.087 Bq l(-1) for all types of water covered within this survey. The corresponding annual effective ingestion dose due to radon and radium from water was determined from drinking water used by the population inhabiting the area.
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Affiliation(s)
- M Moldovan
- Faculty of Environmental Science and Engineering, Babeş-Bolyai University, Cluj-Napoca, România Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, România
| | - V Benea
- ANRANR, Chişinău, Republic of Moldova
| | - D C Niţă
- Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, România
| | - B Papp
- Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, România
| | - B D Burghele
- Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, România
| | - N Bican-Brişan
- Faculty of Environmental Science and Engineering, Babeş-Bolyai University, Cluj-Napoca, România
| | - C Cosma
- Faculty of Environmental Science and Engineering, Babeş-Bolyai University, Cluj-Napoca, România Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, România
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Moldovan M, Romer Rosberg M, Alvarez S, Klein D, Martini R, Krarup C. P972: NaV1.8 channel dysfunction in demyelinating Charcot-Marie-Tooth disease – insights from mice heterozygously deficient for the myelin protein P0 gene. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)51006-1] [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: 11/29/2022]
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Voicu M, Moldovan M, Duchene F. Maladie de Willebrand acquise révélée par un tableau hémorragique atypique dans un contexte de maladie de Waldenström. Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.03.286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Catalin B, Iancau M, Moldovan M. P857: Thoracic outlet syndrome with more than 8 years subclavian artery involvement? Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50890-5] [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: 10/25/2022]
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Voicu ML, Redares C, Moldovan M, Martiniuc I, Duchêne F. Angioedème acquis révélant une maladie de Waldenström. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.10.166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ojeda-Uribe M, Jeandidier E, Moldovan M, Renneville A, Debliquis A, Thiebault S, Passweg J, Gervais C, Mauvieux L, Ittel A. P-087 SAA associated to a del(5)(q15q31) clone not involving EGR1: Progression of this clone contrasting with SAA improvement under immunosuppressive therapy. Leuk Res 2013. [DOI: 10.1016/s0145-2126(13)70136-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Braithwaite J, Shaw CD, Moldovan M, Greenfield D, Hinchcliff R, Mumford V, Kristensen MB, Westbrook J, Nicklin W, Fortune T, Whittaker S. Comparison of health service accreditation programs in low- and middle-income countries with those in higher income countries: a cross-sectional study. Int J Qual Health Care 2012; 24:568-77. [DOI: 10.1093/intqhc/mzs064] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Furtos G, Baldea B, Silaghi-Dumitrescu L, Bratu D, Moldovan M, Prejmerean C. Measuring the Radiopacity of Flowable Resin Composites Using Scanned Radiograph Images. Particulate Science and Technology 2012. [DOI: 10.1080/02726351.2011.589489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Krarup C, Rosberg M, Vikesa J, Cilius Nielsen F, Moldovan M. Degeneration and Regeneration of Peripheral Motor Axons Is Impaired in Mice Heterozygously Deficient for the Myelin Protein P0 Gene (P05.152). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p05.152] [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] Open
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Krarup C, Rosberg M, Vikesa J, Cilius Nielsen F, Moldovan M. Degeneration and Regeneration of Peripheral Motor Axons Is Impaired in Mice Heterozygously Deficient for the Myelin Protein P0 Gene (IN1-2.001). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.in1-2.001] [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] Open
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Moldovan M, Stevens KT, Halliburton LE, Schunemann PG, Pollak TM, Setzler SD, Giles NC. Photoluminescence and EPR of Phosphorus Vacancies in ZnGep2. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-607-445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractZinc germanium diphosphide (ZnGeP2) is a nonlinear optical material used in mid-infrared optical parametric oscillators. The near-infrared photoluminescence (PL) from single crystals of bulk ZnGeP2 has been studied as a function of excitation power, wavelength, temperature, and polarization. At 5 K, a broad PL band extending from 0.7 µm to beyond 1 µm is typically observed. Two distinct emissions with different polarization, power, and temperature behaviors have been resolved. These bands have peaks in intensity near 1.6 eV and 1.4 eV. The relative intensities of these two bands were found to correlate with the presence of phosphorus vacancies, as determined by electron paramagnetic resonance (EPR). A resonance in the intensity of the 1.6-eV band occurs when pumping into a level ∼90 meV below the minimum conduction band. This level is tentatively assigned to the shallow state.
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Cojocaru IM, Socoliuc G, Sapira V, Bastian A, Alexianu M, Moldovan M. Dermatomyositis and polyradiculoneuritis, a rare association. Rom J Intern Med 2011; 49:217-221. [PMID: 22471104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The association between dermatomyositis and polyradiculoneuritis is rarely citated in the speciality literature. Our patient had at first a disorder that looked like dermatomyositis, then she associated polyradiculoneuritis. At the presentation to our hospital the two diseases were combined, being very difficult to differentiate. The discrimination between these two had been made by performing a muscular biopsy and EMG studies. This emphasizes once again their importance in defining the muscular impairment from the neurogenic one.
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Affiliation(s)
- Inimioara Mihaela Cojocaru
- "Carol Davila" University of Medicine and Pharmacy, Department of Neurology, Colentina Clinical Hospital, Bucharest, Romania.
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Meehan CF, Moldovan M, Marklund SL, Graffmo KS, Nielsen JB, Hultborn H. Intrinsic properties of lumbar motor neurones in the adult G127insTGGG superoxide dismutase-1 mutant mouse in vivo: evidence for increased persistent inward currents. Acta Physiol (Oxf) 2010; 200:361-76. [PMID: 20874803 DOI: 10.1111/j.1748-1716.2010.02188.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
AIM Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease characterized by a preferential loss of motor neurones. Previous publications using in vitro neonatal preparations suggest an increased excitability of motor neurones in various superoxide dismutase-1 (SOD1) mutant mice models of ALS which may contribute to excitotoxicity of the motor neurones. METHODS Using intracellular recording, we tested this hypothesis in vivo in the adult presymptomatic G127insTGGG (G127X) SOD1 mutant mouse model of ALS. RESULTS At resting membrane potentials the basic intrinsic properties of lumbar motor neurones in the adult presymptomatic G127X mutant are not significantly different from those of wild type. However, at more depolarized membrane potentials, motor neurones in the G127X SOD1 mutants can sustain higher frequency firing, showing less spike frequency adaption (SFA) and with persistent inward currents (PICs) being activated at lower firing frequencies and being more pronounced. CONCLUSION We demonstrated that, in vivo, at resting membrane potential, spinal motor neurones of the adult G127X mice do not show an increased excitability. However, when depolarized they show evidence of an increased PIC and less SFA which may contribute to excitotoxicity of these neurones as the disease progresses.
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Affiliation(s)
- C F Meehan
- Department of Neuroscience and Pharmacology, Panum Institute, University of Copenhagen, Denmark.
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Krarup C, Moldovan M. S3-2 Axonal conduction in degenerating and regenerating nerve fibers. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60048-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Cara RR, Nicola C, Prejmerean C, Sava S, Băciut G, Băciut M, Bran S, Bondor C, Prodan D, Moldovan M, Buruiană T, Pătraşcu I. Influence of Bis-GMA Derivative Monomer-Based Particulate Composite Resins on the Cuspal Deformation and Microleakage of Restored Teeth. Particulate Science and Technology 2010. [DOI: 10.1080/02726351.2010.481570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Moldovan M, Gibbons J, Chu C, Parker B. SU-FF-T-183: Helical Tomotherapy Treatment Plan Optimization for Superficial Chest Wall Irradiation Incorporating Intrafractional Motion. Med Phys 2009. [DOI: 10.1118/1.3181658] [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: 11/07/2022] Open
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Moldovan M, Gibbons J, Chu C, Parker B. SU-FF-T-616: Influence of Respiratory Motion On Helical Tomotherapy Treatment Planning for Chest Wall Irradiation. Med Phys 2009. [DOI: 10.1118/1.3182114] [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: 11/07/2022] Open
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Furtos G, Baldea B, Bratu D, Moldovan M, Silaghi-Dumitrescu L. Radiopacity of dental cements. Dent Mater 2009. [DOI: 10.1016/j.dental.2009.01.050] [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: 11/30/2022]
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Ilie A, Ciocan D, Constantinescu A, Zagrean AM, Nita D, Zagrean L, Moldovan M. Endogenous Activation of adenosine A1 receptors promotes post-ischemic electrocortical burst suppression. Neuroscience 2009; 159:1070-8. [DOI: 10.1016/j.neuroscience.2009.01.025] [Citation(s) in RCA: 12] [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] [Received: 10/16/2008] [Revised: 12/12/2008] [Accepted: 01/14/2009] [Indexed: 10/21/2022]
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Moldovan M, Lee T, Chu C, Hogstrom K, Fields R, Gibbons J. SU-GG-T-477: Influence of Pitch and Jaw Width On Helical Tomotherapy Head and Neck Treatment Planning. Med Phys 2008. [DOI: 10.1118/1.2962226] [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: 11/07/2022] Open
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Achim M, Tomuta I, Vlase L, Iuga C, Moldovan M, Leucuta S. Paclitaxel-loaded poly(lactic-co-glycolic acid) microspheres: preparation and in vitro evaluation. J Drug Deliv Sci Technol 2008. [DOI: 10.1016/s1773-2247(08)50080-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Donard O, Bruneau F, Moldovan M, Garraud H, Epov V, Boust D. Multi-isotopic determination of plutonium (239Pu, 240Pu, 241Pu and 242Pu) in marine sediments using sector-field inductively coupled plasma mass spectrometry. Anal Chim Acta 2007; 587:170-9. [DOI: 10.1016/j.aca.2007.01.047] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2006] [Revised: 01/10/2007] [Accepted: 01/16/2007] [Indexed: 10/23/2022]
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Abstract
AIM Following Wallerian degeneration, peripheral myelinated axons have the ability to regenerate and, given a proper pathway, establish functional connections with targets. In spite of this capacity, the clinical outcome of nerve regeneration remains unsatisfactory. Early studies have found that regenerated internodes remain persistently short though this abnormality did not seem to influence recovery in conduction. It remains unclear to which extent abnormalities in axonal function itself may contribute to the poor outcome of nerve regeneration. METHODS We review experimental evidence indicating that internodes play an active role in axonal function. RESULTS By investigating internodal contribution to axonal excitability we have found evidence that axonal function may be permanently compromised in regenerated nerves. Furthermore, we illustrate that internodal function is also abnormal in regenerated human nerves. CONCLUSION The data suggest that persistently shorter regenerated internodes lead to increased Na+/K+-pump activity in response to increased Na+ entry during conduction. This may impair axonal function during prolonged repetitive activity and drain the energy reserves of the axons.
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Affiliation(s)
- M Moldovan
- Division of Neurophysiology, Institute of Medical Physiology, Panum Institute, University of Copenhagen, Copenhagen, Denmark.
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Moldovan M, Leucuta S, Bakri A. Preparation, in vitro release and skin absorption of hydrocortisone acetate from a liposome gel. J Drug Deliv Sci Technol 2006. [DOI: 10.1016/s1773-2247(06)50019-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Thomas EL, Moldovan M, Young DP, Chan JY. Structural comparisons of three intermetallic antimonide families. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305085090] [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: 04/03/2023] Open
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Millican JN, Young DP, Moldovan M, Chan JY. The crystal growth and structure and property relationships of Pr-Ni-Ga Phases. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305085089] [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: 11/10/2022] Open
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Furtos G, Cosma V, Prejmerean C, Moldovan M, Brie M, Colceriu A, Vezsenyi L, Silaghi-Dumitrescu L, Sirbu C. Fluoride release from dental resin composites. Materials Science and Engineering: C 2005. [DOI: 10.1016/j.msec.2005.01.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Young DP, Moldovan M, Wu XS, Adams PW, Chan JY. Low-temperature susceptibility of the noncentrosymmetric superconductor CePt3Si. Phys Rev Lett 2005; 94:107001. [PMID: 15783505 DOI: 10.1103/physrevlett.94.107001] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2004] [Revised: 11/22/2004] [Indexed: 05/24/2023]
Abstract
We report ac susceptibility measurements of polycrystalline CePt(3)Si down to 60 mK and in applied fields up to 9 T. In a zero applied field, a full Meissner state emerges at temperatures T/T(c) < 0.3, where T(c) = 0.65 K is the onset transition temperature. Though transport measurements show a relatively high upper critical field B(c2) approximately 4-5 T, the low-temperature susceptibility chi(') is quite fragile to the applied field, with chi(') diminishing rapidly in fields of a few kG. Interestingly, the field dependence of chi(') is well described by the power law 4pichi(') + 1 = (B/B(c))(1/2), where B(c) is the field at which the onset of resistance is observed in transport measurements.
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Affiliation(s)
- D P Young
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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