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1. Nonthermal plasma affects viability and morphology of Mycoplasma hominis and Acholeplasma laidlawii

Author

Irina V. Rakovskaya, Levina Ga, Andrey Ya. Mukhachev, Vladimir E. Fortov, Gregor E. Morfill, Miller Gg, Anatoly I. Grigoriev, Alexander L. Gintsburg, Mikhail M. Vasiliev, Oleg F. Petrov, E. V. Sysolyatina, R. R. Adgamov, and Svetlana Ermolaeva

Subjects
Plasma Gases, Ultraviolet Rays, viruses, Mycoplasma hominis, Nonthermal plasma, medicine.disease_cause, Applied Microbiology and Biotechnology, Microbiology, chemistry.chemical_compound, medicine, Butylated hydroxytoluene, Acholeplasma laidlawii, Argon, Microwaves, Hydrogen peroxide, chemistry.chemical_classification, Reactive oxygen species, Microbial Viability, biology, General Medicine, Oxidants, biology.organism_classification, Anti-Bacterial Agents, Cholesterol, chemistry, Staphylococcus aureus, Mollicutes, Bacteria, Biotechnology
Abstract

Aim To study the effects exerted by argon microwave nonthermal plasma (NTP) on cell wall-lacking Mollicutes bacteria. Methods and Results 108 CFU ml−1 agar plated Mycoplasma hominis and Acholeplasma laidlawii were treated with the nonthermal microwave argon plasma for 30–300 s. The maximal 10- and 100-fold drop was observed for A. laidlawii and Myc. hominis, respectively. Similarly treated Escherichia coli and Staphylococcus aureus demonstrated the 105 and 103 drop, respectively. Removal of cholesterol affected resistance of A. laidlawii. 10 mmol l−1 antioxidant butylated hydroxytoluene decreased mortality by a factor of 25–200. UV radiation alone caused 25–85% mortality in comparison with the whole NTP. Exogenously added hydrogen peroxide H2O2 did not cause mortality. NTP treatment of Myc. hominis triggered growth of microcolonies, which were several tenfold smaller than a typical colony. Conclusions Despite the lack of cell wall, A. laidlawii and Myc. hominis were more resistant to argon microwave NTP than other tested bacteria. Mycoplasma hominis formed microcolonies upon NTP treatment. A role of UV and active species was demonstrated. Significance and Impact of the Study The first study of NTP effects on Mollicutes revealed importance of a membrane composition for bacterial resistance to NTP. New specific Myc. hominis morphological forms were observed. The study confirmed importance of the concerted action of reactive oxygen species (ROS) with UV and other plasma bioactive agents for NTP bactericidal action.

Published
2014

2. Recent Results from SNO

Author

Sinclair, D, Kutter, T, Nally, CW, Oser, SM, Waltham, CE, Boger, J, Hahn, RL, Lange, R, Yeh, M, Bellerive, A, Dai, X, Dalnoki-Veress, F, Dosanjh, RS, Grant, DR, Hargrove, CK, Hemingway, RJ, Levine, I, Mifflin, C, Rollin, E, Simard, O, Starinsky, N, Tesic, G, Waller, D, Jagam, P, Labranche, H, Law, J, Lawson, IT, Nickel, BG, Ollerhead, RW, Simpson, JJ, Farine, J, Fleurot, F, Hallman, ED, Luoma, S, Schwendener, MH, Tafirout, R, Virtue, CJ, Chan, YD, Chen, X, Heeger, KM, Lesko, KT, Marino, AD, Norman, EB, Okada, CE, Poon, AWP, Rosendahl, SSE, Stokstad, RG, Boulay, MG, Bowles, TJ, Brice, SJ, Dragowsky, MR, Elliott, SR, Fowler, MM, Hamer, AS, Heise, J, Hime, A, Miller, GG, Van de Water, RG, Wilhelmy, JB, Wouters, JM, Biller, SD, Bowler, MG, Cleveland, BT, Doucas, G, Dunmore, JA, Fergani, H, Frame, K, Jelley, NA, Majerus, S, McGregor, G, Peeters, SJM, Sims, CJ, Thorman, M, Tseung, HWC, West, N, Wilson, JR, Zuber, K, Beier, EW, Dunford, M, Heintzelman, WJ, Kyba, CCM, McCauley, N, Rusu, VL, Van Berg, R, Ahmed, SN, Chen, M, Duncan, FA, Earle, ED, Fulsom, BG, Evans, HC, Ewan, GT, Graham, K, Hallin, AL, Handler, WB, Harvey, PJ, Kos, MS, Krumins, AV, Leslie, JR, and MacLellan, R

Subjects
Heavy water, chemistry.chemical_classification, Nuclear and High Energy Physics, chemistry.chemical_compound, Materials science, chemistry, Seesaw molecular geometry, Chemical engineering, Phase (matter), Salt (chemistry), Nanotechnology, Atomic and Molecular Physics, and Optics
Abstract

The SNO project has now completed two of its three major phases of operation. The no-oscillation hypothesis has been ruled out at 5σ in the pure heavy water phase and 8σ in the salt phase. Discussion in terms of the SeeSaw model is presented. © 2004 Published by Elsevier B.V.

Published
2004

3. Measurement of the rate of nu(e) + d --p + p + e(-) interactions produced by (8)B solar neutrinos at the Sudbury Neutrino Observatory

Author

Ahmad, QR, Allen, RC, Andersen, TC, Anglin, JD, Bühler, G, Barton, JC, Beier, EW, Bercovitch, M, Bigu, J, Biller, S, Black, RA, Blevis, I, Boardman, RJ, Boger, J, Bonvin, E, Boulay, MG, Bowler, MG, Bowles, TJ, Brice, SJ, Browne, MC, Bullard, TV, Burritt, TH, Cameron, K, Cameron, J, Chan, YD, Chen, M, Chen, HH, Chen, X, Chon, MC, Cleveland, BT, Clifford, ET, Cowan, JH, Cowen, DF, Cox, GA, Dai, Y, Dai, X, Dalnoki-Veress, F, Davidson, WF, Doe, PJ, Doucas, G, Dragowsky, MR, Duba, CA, Duncan, FA, Dunmore, J, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Ferraris, AP, Ford, RJ, Fowler, MM, Frame, K, Frank, ED, Frati, W, Germani, JV, Gil, S, Goldschmidt, A, Grant, DR, Hahn, RL, Hallin, AL, Hallman, ED, Hamer, A, Hamian, AA, Haq, RU, Hargrove, CK, Harvey, PJ, Hazama, R, Heaton, R, Heeger, KM, Heintzelman, WJ, Heise, J, Helmer, RL, Hepburn, JD, Heron, H, Hewett, J, Hime, A, Howe, M, Hykawy, JG, Isaac, MC, Jagam, P, Jelley, NA, Jillings, C, Jonkmans, G, Karn, J, Keener, PT, Kirch, K, Klein, JR, Knox, AB, Komar, RJ, Kouzes, R, Kutter, T, Kyba, CC, Law, J, Lawson, IT, Lay, M, Lee, HW, Lesko, KT, Leslie, JR, Levine, I, Locke, W, Lowry, MM, Luoma, S, Lyon, J, Majerus, S, Mak, HB, Marino, AD, McCauley, N, McDonald, AB, McDonald, DS, McFarlane, K, McGregor, G, McLatchie, W, Meijer Drees, R, Mes, H, Mifflin, C, Miller, GG, Milton, G, Moffat, BA, Moorhead, M, Nally, CW, Neubauer, MS, Newcomer, FM, Ng, HS, Noble, AJ, Norman, EB, Novikov, VM, O'Neill, M, Okada, CE, Ollerhead, RW, Omori, M, Orrell, JL, Oser, SM, Poon, AW, Radcliffe, TJ, Roberge, A, Robertson, BC, Robertson, RG, Rowley, JK, Rusu, VL, Saettler, E, Schaffer, KK, Schuelke, A, Schwendener, MH, Seifert, H, Shatkay, M, Simpson, JJ, Sinclair, D, Skensved, P, Smith, AR, Smith, MW, Starinsky, N, Steiger, TD, Stokstad, RG, Storey, RS, Sur, B, Tafirout, R, Tagg, N, Tanner, NW, Taplin, RK, Thorman, M, Thornewell, P, Trent, PT, Tserkovnyak, YI, Van Berg, R, Van de Water, RG, Virtue, CJ, Waltham, CE, Wang, JX, Wark, DL, West, N, Wilhelmy, JB, Wilkerson, JF, Wilson, J, Wittich, P, Wouters, JM, and Yeh, M

Subjects
High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
Abstract

Solar neutrinos from (8)B decay have been detected at the Sudbury Neutrino Observatory via the charged current (CC) reaction on deuterium and the elastic scattering (ES) of electrons. The flux of nu(e)'s is measured by the CC reaction rate to be straight phi(CC)(nu(e)) = 1.75 +/- 0.07(stat)(+0.12)(-0.11)(syst) +/- 0.05(theor) x 10(6) cm(-2) s(-1). Comparison of straight phi(CC)(nu(e)) to the Super-Kamiokande Collaboration's precision value of the flux inferred from the ES reaction yields a 3.3 sigma difference, assuming the systematic uncertainties are normally distributed, providing evidence of an active non- nu(e) component in the solar flux. The total flux of active 8B neutrinos is determined to be 5.44+/-0.99 x 10(6) cm(-2) s(-1).

Published
2001

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