Formation of specifically transducing lambda dg-particles. II. Relationship between the transduction rate, the qualitative composition of the transductants, and the dose of the inducing agent

The formation of specifically transducing lambda dg-particles in E.coli strain W3110 (lambda) due to the effect of different doses of UV irradiation was studied. A sharp increase in both the absolute number of transductants and the relative transduction frequency was found to occur as the dose of UV irradiation increased. On achieving definite doses this relationship became almost direct. At higher doses similarity was observed in the kinetics of a decrease in the absolute number of transductants and in active phage titers. As the dose increased further, a sharp increase in the percentage of heterogenoue transductants occurred. The conclusion that the formation of specifically transducing lambda dg-particles is due to the effect of the inducing factor on the DNA of lysogenic cells has been made.     

Plasma Jet-Assisted Synthesis of Graphene Using a DC Plasma Torch

Plasma Physics Reports - Conditions of substrate-free syntheses of graphene and graphene-based systems based on conversion of liquid and gaseous carbon precursors in helium, nitrogen, and argon...     

Simulation of ethylene conversion initiated by a streamer corona in an air flow

The conversion of ethylene (C₂H₄) at concentrations of 400 and 930 ppm in an air flow at a temperature of 295 K is simulated. Ethylene is added to air either upstream of the discharge chamber or in the reaction tube, downstream of a pulsed corona discharge. It is taken into account that the distribution of the gas components in the discharge zone is nonuniform due to the streamer nature of the discharge. In the reaction tube, all of the components are assumed to be uniform. Simulation results agree with the experiments carried out at voltage pulse amplitudes of 30 and 40 kV, a gas flow rate of 2–10 l/min, and a specific energy deposition of up to 0.15 J/cm³. It is shown that the ozone produced plays a governing role in the C₂H₄ conversion. It is found that it is possible to minimize the energy spent on conversion by choosing the optimum pulse repetition rate and the specific energy deposited per pulse. The presence of water vapor impedes the ethylene conversion and increases the concentration of formaldehyde and methane.     

High-Power Neutral Beam Injector with Tunable Beam Energy for Plasma Heating and Stabilization

Plasma Physics Reports - For plasma heating and stabilization in open magnetic traps, the high-power neutral beam injector with tunable beam energy was developed at Budker Institute of Nuclear...