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1. Creative music therapy in preterm infants effects cerebrovascular oxygenation and perfusion

Author

Felix Scholkmann, Friederike Haslbeck, Emily Oba, Tanja Restin, Daniel Ostojic, Stefan Kleiser, Bartha C. H. Verbiest, Hamoon Zohdi, Ursula Wolf, Dirk Bassler, Hans Ulrich Bucher, Martin Wolf, and Tanja Karen

Subjects
Optical neuroimaging, Functional near-infrared spectroscopy, fNIRS, Creative music therapy, Preterm infants, Brain development, Medicine, Science
Abstract

Abstract Creative music therapy (CMT) has been shown to promote the development of brain function and structure in preterm infants. We aimed to investigate the effect of CMT on cerebral oxygenation and perfusion to examine how the brain reacts to CMT. Absolute levels of cerebrovascular oxygen saturation (StO2) were measured in clinically stable preterm-born neonates (n = 20, gestational age: ≥30 weeks and

Published
2024
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6. Mud and burnt Roman bricks from Romula

Author

Badica, P., Alexandru-Dinu, A., Grigoroscuta, M. A., Burdusel, M., Aldica, G. V., Sandu, V., Bartha, C., Polosan, S., Galatanu, A., Kuncser, V., Enculescu, M., Locovei, C., Porosnicu, I., Tiseanu, I., Ferbinteanu, M., Savulescu, I., Negru, M., and Batalu, N. D.

Published
2022
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12. Contributors

Author

Chiappini, A., primary, Lukowiak, A., additional, Frias, A.R., additional, Martucci, Alessandro, additional, Durán, Alicia, additional, Capoen, Bruno, additional, Armellini, C., additional, Bartha, C., additional, Secu, C.E., additional, Levy, David, additional, Traid, Hernán, additional, Hamzaoui, Hicham El, additional, Xu, Jian, additional, Qian, Jingjing, additional, Pasquardini, L., additional, Liu, Lin, additional, Carlos, Luís D., additional, Ferrari, M., additional, Secu, M., additional, Monticelli, Marcus, additional, Vera, María L., additional, Litter, Marta I., additional, Guglielmi, Massimo, additional, Lu, Meng, additional, Bouazaoui, Mohamed, additional, André, P.S., additional, Whitman, Pam, additional, Rojas-Hernandez, Rocío Estefanía, additional, Ferreira, Rute A.S., additional, Correia, Sandra F.H., additional, Suratwala, Tayyab, additional, and Castro, Yolanda, additional

Published
2020
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24. A Machine Learning Algorithm to Identify Patients at Risk of Unplanned Subsequent Surgery After Intramedullary Nailing for Tibial Shaft Fractures

Author

Bhandari, M., Bulstra, A.E.J., Bzovsky, S., Doornberg, J.N., Goslings, J.C., Hendrickx, L.A.M., Jaarsma, R.L., Jeray, K.J., Kerkhoffs, G.M.M.J., Petrisor, B., Ring, D., Schemitsch, E.H., Swiontkowski, M., Sanders, D., Sprague, S., Tornetta, P., Walter, S.D., Heels-Ansdell, D., Buckingham, L., Leece, P., Viveiros, H., Mignott, T., Ansell, N., Sidorkewicz, N., Agel, J., Bombardier, C., Berlin, J.A., Bosse, M., Browner, B., Gillespie, B., Jones, A., O'Brien, P., Poolman, R., Macleod, M.D., Carey, T., Leitch, K., Bailey, S., Gurr, K., Konito, K., Bartha, C., Low, I., MacBean, L.V., Ramu, M., Reiber, S., Strapp, R., Tieszer, C., Kreder, H.J., Stephen, D.J.G., Axelrod, T.S., Yee, A.J.M., Richards, R.R., Finkelstein, J., Gofton, W., Murnaghan, J., Schatztker, J., Ford, M., Bulmer, B., Conlan, L., Laflamme, G.Y., Berry, G., Beaumont, P., Ranger, P., Laflamme, G.H., Gagnon, S., Malo, M., Fernandes, J., Poirier, M.F., McKee, M.D., Waddell, J.P., Bogoch, E.R., Daniels, T.R., McBroom, R.R., Vicente, M.R., Storey, W., Wild, L.M., McCormack, R., Perey, B., Goetz, T.J., Pate, G., Penner, M.J., Panagiotopoulos, K., Pirani, S., Dommisse, I.G., Loomer, R.L., Stone, T., Moon, K., Zomar, M., Webb, L.X., Teasdall, R.D., Birkedal, J.P., Martin, D.F., Ruch, D.S., Kilgus, D.J., Pollock, D.C., Harris, M.B., Wiesler, E.R., Ward, W.G., Shilt, J.S., Koman, A.L., Poehling, G.G., Kulp, B., Creevy, W.R., Stein, A.B., Bono, C.T., Einhorn, T.A., Brown, T.D., Pacicca, D., Sledge, J.B., Foster, T.E., Voloshin, I., Bolton, J., Carlisle, H., Shaughnessy, L., Obremskey, W.T., LeCroy, C.M., Meinberg, E.G., Messer, T.M., Craig, W.L., Dirschl, D.R., Caudle, R., Harris, T., Elhert, K., Hage, W., Jones, R., Piedrahita, L., Schricker, P.O., Driver, R., Godwin, J., Kregor, P.J., Tennent, G., Truchan, L.M., Sciadini, M., Shuler, F.D., Driver, R.E., Nading, M.A., Neiderstadt, J., Vap, A.R., Vallier, H., Patterson, B.M., Wilber, J.H., Wilber, R.G., Sontich, J.K., Moore, T.A., Brady, D., Cooperman, D.R., Davis, J.A., Cureton, B.A., Mandel, S., Orr, R.D., Sadler, J.T.S., Hussain, T., Rajaratnam, K., Drew, B., Bednar, D.A., Kwok, D.C.H., Pettit, S., Hancock, J., Cole, P.A., Smith, J.J., Brown, G.A., Lange, T.A., Stark, J.G., Levy, B.A., Garaghty, M.J., Salzman, J.G., Schutte, C.A., Tastad, L., Vang, S., Seligson, D., Roberts, C.S., Malkani, A.L., Sanders, L., Dyer, C., Heinsen, J., Smith, L., Madanagopal, S., Frantz-Bush, L., Coupe, K.J., Tucker, J.J., Criswell, A.R., Buckle, R., Rechter, A.J., Sheth, D.S., Urquart, B., Trotscher, T., Anders, M.J., Kowalski, J.M., Fineberg, M.S., Bone, L.B., Phillips, M.J., Rohrbacher, B., Stegemann, P., Mihalko, W.M., Buyea, C., Augustine, S.J., Jackson, W.T., Solis, G., Ero, S.U., Segina, D.N., Berrey, H.B., Agnew, S.G., Fitzpatrick, M., Campbell, L.C., Derting, L., McAdams, J., Ponsen, K.J., Luitse, J., Kloen, P., Joosse, P., Winkelhagen, J., Duivenvoorden, R., Teague, D.C., Davey, J., Sullivan, J.A., Ertl, W.J.J., Puckett, T.A., Pasque, C.B., Tompkins, J.F., Gruel, C.R., Kammerlocher, P., Lehman, T.P., Puffinbarger, W.R., Carl, K.L., Weber, D.W., Jomha, N.M., Goplen, G.R., Masson, E., Beaupre, L.A., Greaves, K.E., Schaump, L.N., Goetz, D.R., Westberry, D.E., Broderick, J.S., Moon, B.S., Tanner, S.L., Powell, J.N., Buckley, R.E., Elves, L., Connolly, S., Abraham, E.P., Steele, T., Ellis, T., Herzberg, A., Crawford, D.E., Hart, R., Hayden, J., Orfaly, R.M., Vigland, T., Vivekaraj, M., Bundy, G.L., Miclau, T., Matityahu, A., Coughlin, R.R., Kandemir, U., McClellan, R.T., Lin, C.H.H., Karges, D., Cramer, K., Watson, J.T., Moed, B., Scott, B., Beck, D.J., Orth, C., Puskas, D., Clark, R., Jones, J., Egol, K.A., Paksima, N., France, M., Wai, E.K., Johnson, G., Wilkinson, R., Gruszczynski, A.T., Vexler, L., Mallee, W.H., Schipper, I.B., and SPRINT Investigators

Subjects
prediction model, intramedullary nailing, machine learning, subsequent surgery, tibia shaft fracture, Orthopedics and Sports Medicine, Surgery, General Medicine
Abstract

Objectives: In the SPRINT trial, 18% of patients with a tibial shaft fracture (TSF) treated with intramedullary nailing (IMN) had one or more unplanned subsequent surgical procedures. It is clinically relevant for surgeon and patient to anticipate unplanned secondary procedures, other than operations that can be readily expected such as reconstructive procedures for soft tissue defects. Therefore, the objective of this study was to develop a machine learning (ML) prediction model using the SPRINT data that can give individual patients and their care team an estimate of their particular probability of an unplanned second surgery. Methods: Patients from the SPRINT trial with unilateral TSFs were randomly divided into a training set (80%) and test set (20%). Five ML algorithms were trained in recognizing patterns associated with subsequent surgery in the training set based on a subset of variables identified by random forest algorithms. Performance of each ML algorithm was evaluated and compared based on (1) area under the ROC curve, (2) calibration slope and intercept, and (3) the Brier score. Results: Total data set comprised 1198 patients, of whom 214 patients (18%) underwent subsequent surgery. Seven variables were used to train ML algorithms: (1) Gustilo-Anderson classification, (2) Tscherne classification, (3) fracture location, (4) fracture gap, (5) polytrauma, (6) injury mechanism, and (7) OTA/AO classification. The best-performing ML algorithm had an area under the ROC curve, calibration slope, calibration intercept, and the Brier score of 0.766, 0.954, -0.002, and 0.120 in the training set and 0.773, 0.922, 0, and 0.119 in the test set, respectively. Conclusions: An ML algorithm was developed to predict the probability of subsequent surgery after IMN for TSFs. This ML algorithm may assist surgeons to inform patients about the probability of subsequent surgery and might help to identify patients who need a different perioperative plan or a more intensive approach.

Published
2021

29. Peripheral Oxidative Stress Markers Are Related To Vascular Risk Factors And Subcortical Small Vessel Disease

Author

Warrick, N., Seitz, D., Prorok, J., Shawcross, D., Mahootchi, T., Esensoy, A., Yu, D., Danieli, E., Pushpakumar, D., Tony, J., Jacob, K., Dong, J., Javed, F., D’Souza, A., Mollayeva, T., Colantonio, A., Schulz, M., Burhan, A., Naidu, A. Srinivasan, Sarquis-Adamson, Y., Montero-Odasso, M., Cooper, N., Sekhon, H., Launay, C., Allali, G., Chabot, J., Beauchet, O., Watson, B., Lin, T., Korczak, A., Bartha, C., Best, S., Truemner, J., Borrie, M., Cammer, A., Whiting, S., Morgan, D., Newman, K., Duong, J. A., Mok, A., Wang, A. H., Lavoie, M., Bier, N., Macoir, J., Adlimoghaddam, A., Turner, R. S., Cadonic, C., Albensi, B. C., Davis, J., Lewis, V.-L., Pacione, J., Skanes, C., Feltz, N., Loncar, A., Naglie, G., Sanford, S., Stasiulis, E., Rapoport, M., Vrkljan, B., Tuokko, H., Porter, M., Polgar, J., Moorhouse, P., Mazer, B., Marshall, S., Gelinas, I, Crizzle, A, Belchior, P., Bedard, M, Kokorelias, K., Cameron, J., Gignac, M., Bechard, L., Beaton, D., McGilton, K.A., Tartaglia, M. C., Black, S., Mirza, S., Mutsaerts, H.-J., Cash, D., Bocchetta, M., Thomas, D., Dick, K., van Swieten, J., Borroni, B., Galimberti, D., Rowe, J., Bethell, J., Pringle, D., Commisso, E., Chambers, L., Cohen, C., Cowan, K., Fehr, P., Szeto, P., McGilton, K., Shaw, C., Okamura, H., Otani, M., Shimoyama, N., Fujii, T., Lusk, J., Punzalan, M., Dove, E., Cotnam, K., Astell, A., Chow, A. Froehlich, Bayly, M., Kosteniuk, J., Elliot, V., O’Connell, M. E., Kirk, A., Stewart, N., Holroyd-Leduc, J., Daku, J., Kennett-Russill, D., Hack, T., Dilara, A., Astell, A. J., Hernandez, A., Divine, A., Hunter, S., Jacova, C., Alexander, C., Joseph, J. T., Alvarez, A., Smith, E., Woo, S. M. S., Chan, P., Wilkins-Ho, M., Blackburn, P., Fernando, N., Mehra, A., Vasser, E., Musacchio, M., Waxman, R., Fischler, I., Ghaffar, O., DeBay, D. R., Macdonald, I. R., Reid, G. A., Pottie, I. R., Maxwell, S. P., Cash, M. K., Martin, E., Bowen, C. V., Darvesh, S., MacPhee, J., Jorgensen, M., Fogarty, J., Phillips, N., Diprospero, C., Parent, A., Whitehead, V., Campbell, T., Mohades, Z., Chertkow, H., Wong, S., Wilchesky, M., McCusker, J., Champoux, N., Vu, T.T. M., Ciampi, A., Monette, J., Lungu, O., Ballard, S. A., Belzile, E., Carmichael, P.-H., Voyer, P., Cetin-Sahin, D., Gore, B., Peretti, M., Gore, G., Landry, V., Yetman, L., MacDonald, E., McGibbon, C., MacNeil, D., Jarrett, P., Iaboni, A., Andrews, J., Hafezi, S., Marshall, C., Tsokas, M., Martin, L. Schindel, Van Ooteghem, K., Mansfield, A., Marcil, M., Gold, D., Musselman, K., Flint, A., Finger, E., Feldman, H., Cummings, J., Coleman, K., Boxer, A., Berry, S., Hsiung, R., Curtis, A., Zhang, K., Davidson, H. R., Boccone, G., Camicioli, R., Masellis, M., Tierney, M., Dolatabadi, E., Taati, B., Jonas-Simpson, C., Donovan, L., Cross, N., Keren, R., Shan, R., Holley, J., Waisman, Z., Katchaluba, J., Wimhurst, C., Steele, M., Loganathan, P., Gural, P., Shearer, T., Reardon, J., Pilgrim, J., Pitawanakwat, K., Jones, L., Piriano, E., Blind, M., Otowadjiwan, J., Makela, R., Spicer, B., Bretzlaff, M., Jacklin, K., McKay, Kristy, Graham, N., Tang-Wai, D., Leonard, C., Mitchell, S., Laird, L., Rochon, E., Maclagan, L., Maxwell, C., Guan, J., Campitelli, M., Herrmann, N., Lapane, K., Hogan, D., Amuah, J., Gill, S., Bronskill, S., Ebert, P., Kwok, J., Watt, A., Garrett, S., Hoefling, L., Ellery, C., Leggieri, M., Fornazzari, L., Thaut, M., Munoz, D., Barfett, J., Fischer, C., Schweizer, T., Yogaparan, T., Dallaire-Théroux, C., Potvin, O., Dieumegarde, L., Duchesne, Simon, Amini, A.E. Ebrahim, Amini, A.Z. Ebrahim, Dao, E., Barha, C. K., Best, J. R., Hsiung, G.-Y. R., Tam, R., Liu-Ambrose, T., Sztramko, R., Wurster, A., Papaiouannou, A., Cowan, D., St. Onge, J., Allaby, C., Harrison, L., Cimino, C., Marr, S., Patterson, C., Woo, T., Levinson, A., Fisher, S., Mojaverian, N., Hsu, A., Taljaard, M., Manuel, D., Tanuseputro, P., Park, E., Liu, L., VanderPloeg, K., Black, A., Bartha, R., Rabin, J., Yang, H.-S., Schultz, A., Hanseeuw, B., Marshall, G., Hedden, T., Rentz, D., Johnson, K., Sperling, R., Chhatwal, J., Desmarais, P., Miville, C., Keith, J., Lanctôt, K., Thomas, N., Mattek, N., Riley, T., Witter, P., Reynolds, C., Austin, J., Sharma, N., Kaye, J., Bechard, L. E., Mitchell, C. M., Regan, K., Bergelt, M. D., Middleton, L.E., Hewston, P., Kennedy, C., Merom, D., Trainor, L., Grenier, A., Ioannidis, G., Lee, J., Papaioannou, A., Qian, W., Churchill, N., Kumar, S., Rajji, T., Ojeda-López, C., Milán-Tomás, Á., Lam, B., Gao, F. Q., Cumberbatch, S., Gies, S., Tomas, A. Milan, Ojeda-Lopez, C., Lim, A. S., Black, S. E., Sharma, M. J., Ramirez, J., Holmes, M. F., Gao, F., Varatharajah, B., Yhap, V., Appel, L., Bogler, O., Appel, E., Wiseman, M., Cohen, L., Hill, D., Abrams, H., Campos, J., Sapkota, S., Adamo, S., Stuss, D. T., Martinez, M., Multani, N., Anor, C. J., Fox, S., Lang, A. E., Marras, C., Compagnone, J., Li, J., Freedman, M., Kleiner-Fisman, G., Kennedy, J., Chen, R., Lang, A., Sévigny-Dupont, P., Bocti, C., Joannette, M., Lavallée, M. M., Joubert, S., Knoefel, F., Goubran, R., Baker, A., Fraser, S., Allard, B., Wallace, B., Stroulia, E., Guana, V., Masson, P., Alli, S., Kolla, N., De Luca, V., Bouvier, L., Monetta, L., Vitali, P., Laforce, R., Martel-Sauvageau, V., Talebzadeh, A., Ashourinia, K., Moy, S., Lake, A., Cockburn, A., Krisman, D., Sadasivan, B., Sit, W., Stoops, S., McCurbin, S., Cullen, S., Carroll, S., Tasmim, S., Kapoor, E., Callahan, B., Sharma, M., Bierstone, D., Stuss, D., Kapadia, M., Mian, F., Ma, D., Rosa, E., Michalski, B., Zovkic, I., Forsythe, P., Sakic, B., Fahnestock, M., Baxter, J., Peloso, S., Tung, J., Cox, L., Benjamin, S., An, H., Ho, J., Turcotte, V., Parent, C., Gauthier-Beaupré, A., Biss, R., Sultana, A., Chu, C. H., Sun, W., Bartfay, E., Smye, V., Newton, D., Pepin, M., Biswas, S., Madahey, H., Crawford, S. J., Gutmanis, I., Blake, C., Duchesne, S., Hudon, C., Mah, L., Ali, A., Shorey, C., Szabuniewicz, C. M., Anderson, N. D., Verhoeff, N. P. L. G., Cheers, S., Penko, M., Gevaert, V., Yang, Y., Law, J., Modarresi, S., Grahn, J., Overend, T., Amini, D., Thiruparanathan, T., Cheung, T., Iskandar, S., Arone, Y., Young, C., Berezuk, C., and Zakzanis, K.

Subjects
Abstracts
Published
2018

30. Optical, Structural, and Dielectric Properties of Composites Based on Thermoplastic Polymers of the Polyolefin and Polyurethane Type and BaTiO3 Nanoparticles

Author

Baibarac, M., primary, Nila, A., additional, Smaranda, I., additional, Stroe, M., additional, Stingescu, L., additional, Cristea, M., additional, Cercel, R. C., additional, Lorinczi, A., additional, Ganea, P., additional, Mercioniu, I., additional, Ciobanu, R., additional, Schreiner, C., additional, Garcia, R. G., additional, and Bartha, C., additional

Published
2021
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38. Local configurations and atomic intermixing in as-quenched and annealed Fe1−<italic>x</italic>Cr<italic>x</italic> and Fe1−<italic>x</italic>Mo<italic>x</italic> ribbons.

Author

Stanciu, A. E., Greculeasa, S. G., Bartha, C., Schinteie, G., Palade, P., Kuncser, A., Leca, A., Filoti, G., Birsan, A., Crisan, O., and Kuncser, V.

Subjects
IRON alloys, QUENCHING (Chemistry), ATOMIC interactions, MOSSBAUER spectroscopy, THERMAL analysis
Abstract

Local atomic configuration, phase composition and atomic intermixing in Fe-rich Fe1−xCrx and Fe1−xMox ribbons (x = 0.05, 0.10, 0.15), of potential interest for high-temperature applications and nuclear devices, are investigated in this study in relation to specific processing and annealing routes. The Fe-based thin ribbons have been prepared by induction melting, followed by melt spinning and further annealed in He at temperatures up to 1250 °C. The complex structural, compositional and atomic configuration characterisation has been performed by means of X-ray diffraction (XRD), transmission Mössbauer spectroscopy and differential scanning calorimetry (TG-DSC). The XRD analysis indicates the formation of the desired solid solutions with body-centred cubic (bcc) structure in the as-quenched state. The Mössbauer spectroscopy results have been analysed in terms of the two-shell model. The distribution of Cr/Mo atoms in the first two coordination spheres is not homogeneous, especially after annealing, as supported by the short-range order parameters. In addition, high-temperature annealing treatments give rise to oxidation of Fe (to haematite, maghemite and magnetite) at the surface of the ribbons. Fe1−xCrx alloys are structurally more stable than the Mo counterpart under annealing at 700 °C. Annealing at 1250 °C in He enhances drastically the Cr clustering around Fe nuclei. [ABSTRACT FROM AUTHOR]

Published
2018
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39. Crystallization kinetics mechanism investigation of sol–gel-derived NaYF4:(Yb,Er) up-converting phosphors.

Author

Bartha, C., Secu, C. E., Matei, E., and Secu, M.

Subjects
*CRYSTALLIZATION, *DIFFERENTIAL scanning calorimetry
Abstract

The crystallization mechanism of sol–gel-derived NaYF4:(Yb,Er) up-converting phosphors has been studied by differential scanning calorimetry analysis using both model-free and model fitting approaches. Structural and optical data have shown that the hexagonal NaYF4:(Yb,Er) phase crystallization process occurs at around 315 °C as a result of the thermal decomposition of the metal trifluoroacetates. As the annealing temperature increases, sphere-like microcrystals of about 1–2 μm size (at 300 °C) break up into smaller ones (400–500 nm size) and finally collapse at higher temperatures (600 °C); the up-conversion luminescence signal intensity increases due to the crystallinity improvement and dehydration process. The crystallization process can be described as an autocatalytic-type reaction where the accompanying cubic NaYF4 phase played a catalytic role by reducing the energy barrier against the crystallization of the hexagonal NaYF4 phase, causing its fast self-accelerated crystallization. The energy resulting from the disintegration process of the initial NaYF4 microcrystals contributed to the growth and agglomeration processes and finally the collapse of the crystalline fragments with increasing temperature. [ABSTRACT FROM AUTHOR]

Published
2017
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40. Synthesis and characterization of PLD glass phosphate films doped with CdS.

Author

Elisa, M., Iordanescu, C., Vasiliu, I., Feraru, I., Epurescu, G., Filipescu, M., Plapcianu, C., Bartha, C., Trusca, R., and Peretz, S.

Subjects
PHOSPHATES, CHEMICAL synthesis, CADMIUM sulfide, DOPED semiconductors, PULSED laser deposition, CRYSTAL structure, OPTICAL properties of metals
Abstract

In the present work, optical, structural and morphological properties of CdS-doped phosphate films obtained by pulsed laser deposition (PLD) method were investigated. In the deposition process, a target based on a mixture composed of LiO-AlO-BaO-LaO-ZnO-PO glass and CdS powder as dopant was used. The phosphate glass target was obtained by non-conventional wet route of raw reagents processing followed by melt-quenching technique. The complex oxide composition of the glass as well as the final PLD target consisting in a mixture of glass and CdS powder followed by pressing and heat treatment represents the novelty of the work. CdS dopant particles were highlighted by X-ray diffraction analysis as well as by Raman spectroscopy. Thus, cubic CdS particles having less than 10 nm size corroborated with specific LO (longitudinal optical phonons) and 2LO CdS Raman peaks from 300 and 600 cm, respectively, certified the presence of the dopant in the deposited films. Specific vibration modes for the vitreous phosphate matrix were revealed by fourier transform infrared spectroscopy, and spherulitic units characteristic to PLD technique were found by scanning electron microscopy and atomic force microscopy analyses. A relative large luminescence band located around 430 nm was provided by UV excitation, representative for CdS nanoparticles having about 9-10 nm size. [ABSTRACT FROM AUTHOR]

Published
2017
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41. Herausforderung Notarztdienst

Author

Schlechtriemen, T., primary, Armbruster, W., additional, Adler, J., additional, Bartha, C., additional, Becker, K., additional, Höhn, M., additional, Kubulus, D., additional, Morbe, A., additional, Reeb, R., additional, Schmidt, D., additional, Steiner, P., additional, and Wrobel, M., additional

Published
2014
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43. STRUCTURAL AND MAGNETIC PROPERTIES OF Sr2FeMoO6 OBTAINED AT LOW TEMPERATURES.

Author

BARTHA, C., PLAPCIANU, C., CRISAN, A., ENCULESCU, M., and LECA, A.

Subjects
*STRONTIUM, *MAGNETIC properties, *LOW temperatures, *MAGNETIZATION, *ANTIFERROMAGNETIC materials
Abstract

The double-perovskite Sr2FeMoO6 has been obtained by solid state method at low temperature (1060 °C) and a very short time of synthesis (up to 4h). Both, X-ray diffraction and scanning electron microscopy (SEM) confirmed the formation of Sr2FeMoO6 oxide with grain sizes around 160 mm, and a small amount of SrMoO4 as an impurity. Mossbauer spectroscopy revealed a mixed site population with Fe and Mo ions generating a structure type with population inversion. This structure has a critical influence on the magnetic properties, as confirmed by the magnetization and TC values, i.e 3.56 µB/ f.u and 415 K, respectively. The Sr2FeMoO6 behavior was interpreted in terms of ferrimagnetic couplings generated by the various distributions of local interactions between Fe and Mo neighbors while comparing the ideal structure should show antiferromagnetic coupling between the two sublattices. [ABSTRACT FROM AUTHOR]

Published
2016

44. Thermally activated conversion of a silicate gel to an oxyfluoride glass ceramic: Optical study using Eu3+ probe ion.

Author

Secu, C.E., Bartha, C., Polosan, S., and Secu, M.

Subjects
*THERMAL analysis, *SOL-gel processes, *ENERGY conservation, *SILICATES, *OXYFLUORIDES, *GLASS-ceramics, *OPTICAL properties of metals, *EUROPIUM
Abstract

Sol–gel route using metal alkoxides precursor and trifluoroacetic acid as in situ fluorination reagent has been used to prepare Eu3+-doped silicate xerogel, followed by thermal annealing to obtain oxyfluoride glass ceramic containing Eu3+-doped BaF2 nanocrystals. We have used Eu3+ as probe ion and we analyzed its characteristic features (photoluminescence, optical absorption and magnetic circular dichroism) to get information about the local environment around the ion during thermally activated evolution of the sol to xerogel and then glass ceramic. As the drying and annealing proceeds silica network is formed accompanied by precipitation of the nanofluoride crystalline phase; Eu3+ coordination changes gradually from a random and assymetric CF3COO- one (in the sol) to a symmetric one (in the BaF2 nanocrystals) given by the fluorine ions. Glass ceramization is based on a homogenous crystallization mechanism with BaF2 nucleation centres resulted from thermal decomposition of Ba-trifluoacetate at around 300°C followed by subsequent growth into BaF2 nanocrystals above 600°C; Eu3+-ions are incorporated during the nanocrystals growth. [ABSTRACT FROM AUTHOR]

Published
2014
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47. Independent and complementary bio-functional effects of CuO and Ga2O3incorporated as therapeutic agents in silica- and phosphate-based bioactive glasses

Author

Tite, T., Popa, A.C., Stuart, B.W., Fernandes, H.R., Chirica, I.M., Lungu, G.A., Macovei, D., Bartha, C., Albulescu, L., Tanase, C., Nita, S., Rusu, N., Grant, D.M., Ferreira, J.M.F., and Stan, G.E.

Abstract

The incorporation of therapeutic-capable ions into bioactive glasses (BGs), either based on silica (SBGs) or phosphate (PBGs), is currently envisaged as a proficient path for facilitating bone regeneration. In conjunction with this view, the single and complementary structural and bio-functional roles of CuO and Ga2O3(in the 2–5 mol% range) were assessed, by deriving a series of SBG and PBG formulations starting from the parent glass systems, FastOs®BG – 38.5SiO2—36.1CaO—5.6P2O5—19.2MgO—0.6CaF2, and 50.0P2O5—35.0CaO—10.0Na2O—5.0 Fe2O3(mol%), respectively, using the process of melt-quenching. The inter-linked physico-chemistry – biological response of BGs was assessed in search of bio-functional triggers. Further light was shed on the structural role – as network former or modifier – of Cu and Ga, immersed in SBG and PBG matrices. The preliminary biological performance was surveyed in vitroby quantification of Cu and Ga ion release under homeostatic conditions, cytocompatibility assays (in fibroblast cell cultures) and antibacterial tests (against Staphylococcus aureus). The similar (Cu) and dissimilar (Ga) structural roles in the SBG and PBG vitreous networks governed their release. Namely, Cu ions were leached in similar concentrations (ranging from 10–35 ppm and 50–110 ppm at BG doses of 5 and 50 mg/mL, respectively) for both type of BGs, while the release of Ga ions was 1–2 orders of magnitude lower in the case of SBGs (i.e., 0.2–6 ppm) compared to PBGs (i.e., 9–135 ppm). This was attributed to the network modifier role of Cu in both types of BGs, and conversely, to the network former (SBGs) and network modifier (PBGs) roles of Ga. All glasses were cytocompatible at a dose of 5 mg/mL, while at the same concentration the antimicrobial efficiency was found to be accentuated by the coupled release of Cu and Ga ions from SBG. By collective assessment, the most prominent candidate material for the further development of implant coatings and bone graft substitutes was delineated as the 38.5SiO2—34.1CaO—5.6P2O5—16.2MgO—0.6CaF2—2.0CuO—3.0Ga2O3(mol%) SBG system, which yielded moderate Cu and Ga ion release, excellent cytocompatibility and marked antibacterial efficacy.

Published
2022
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48. Optical, Structural, and Dielectric Properties of Composites Based on Thermoplastic Polymers of the Polyolefin and Polyurethane Type and BaTiO 3 Nanoparticles.

Author

Baibarac, M., Nila, A., Smaranda, I., Stroe, M., Stingescu, L., Cristea, M., Cercel, R. C., Lorinczi, A., Ganea, P., Mercioniu, I., Ciobanu, R., Schreiner, C., Garcia, R. G., Bartha, C., and Głuchowski, Paweł

Subjects
DIELECTRIC properties, POLYOLEFINS, RELAXATION phenomena, POLYURETHANES, POLYMER blends, POLYMERS, THERMOPLASTIC composites, THERMOPLASTIC elastomers
Abstract

In this work, new films containing composite materials based on blends of thermoplastic polymers of the polyurethane (TPU) and polyolefin (TPO) type, in the absence and presence of BaTiO3 nanoparticles (NPs) with the size smaller 100 nm, were prepared. The vibrational properties of the free films depending on the weight ratio of the two thermoplastic polymers were studied. Our results demonstrate that these films are optically active, with strong, broad, and adjustable photoluminescence by varying the amount of TPU. The crystalline structure of BaTiO3 and the influence of thermoplastic polymers on the crystallization process of these inorganic NPs were determined by X-ray diffraction (XRD) studies. The vibrational changes induced in the thermoplastic polymer's matrix of the BaTiO3 NPs were showcased by Raman scattering and FTIR spectroscopy. The incorporation of BaTiO3 NPs in the matrix of thermoplastic elastomers revealed the shift dependence of the photoluminescence (PL) band depending on the BaTiO3 NP concentration, which was capable of covering a wide visible spectral range. The dependencies of the dielectric relaxation phenomena with the weight of BaTiO3 NPs in thermoplastic polymers blends were also demonstrated. [ABSTRACT FROM AUTHOR]

Published
2021
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49. Kaolin clay pottery discovered in the Roman city of Romula(Olt County, Romania)

Author

Badica, P., Alexandru-Dinu, A., Grigoroscuta, M., Locovei, C., Kuncser, A., Bartha, C., Aldica, G., Negru, M., Batalu, D., Cruceru, N., and Savulescu, I.

Abstract

•Roman kaolin vessels (2nd, 3rd AD) found in Romula, Dacia Inferiorwere studied.•Samples were characterised by archaeological and physical-chemical methods.•Results were compared with reported data from Moesia Inferior/Superiorand Thracia.•Analysis suggests that the kaolin ware from Romulais locally produced.

Published
2021
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50. SYNTHESIS, CHARACTERIZATION AND CYTOTOXICITY EVALUATION ON ZINC DOPED HYDROXYAPATITE IN COLLAGEN MATRIX

Author

Popa, C. L., Bartha, C. M., Albu, M., Guegan, R., Motelica-Heino, M., Chifiriuc, M. C., Coralia Bleotu, Badea, M. L., Antohe, S., National Institute of Physics of Materials, University of Bucharest, Faculty of Physics, University of Bucharest (UniBuc), National Research & Development Institute for Textiles and Leather (INCDTP), Collagen Department, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Microbiology Department, Institute of Virology, Antiviral Therapy Department 'Stefan S. Nicolau', University of Agronomical Sciences and Veterinary Medicine, and IFA-CEA C4-05/2014 and PN II 221/2014.grant POSDRU/159/1.5/S/137750, 'Project Doctoral and Postdoctoral programs support for increased competitiveness in Exact Sciences research' cofinanced by the European Social Found within the Sectorial Operational Program Human Resources Development 2007 – 2013.

Subjects
Zinc, stomatognathic system, Collagen, [SDV.IB.BIO]Life Sciences [q-bio]/Bioengineering/Biomaterials, Bio-composite, Hydroxyapatite, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; The goal of this study was to obtain at low temperature a functional nano-composite with characteristics similar to the natural bone by using a cost effective method. The structure and morphology of collagen coated zinc doped hydroxyapatite bio-composites (Zn:HAp-CBc) were examined by X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM). XRD analysis revealed that the unique hexagonal Ca 10 (PO 4) 6 (OH) 2 in P 63m space group was observed in the obtained nanocomposites Zn:HAp-CBc. The cytotoxicity of the Zn:HAp-CBc was studied on HeLa cell lines. Cell cycle distribution after treatment was examined by flow cytometry analysis. Our preliminary in vitro studies revealed that the obtained composites based on Zn doped HAp embedded in collagen matrix have excellent biocompatibility and support their further characterization by in vivo approaches and development as a biomaterial used in bone regeneration.

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