• Korean Journal of Soil Science and Fertilizer
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• v.34 no.4
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• pp.237-244
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• 2001

Investigation on the surface charge properties of some Korean arable soils was performed by ion adsorption technique with two kinds of indifferent ion ($Na^+$ and $K^+$) at the range of pH 3 to 9 in bulk solution. The contribution of soil components(organic matter, oxides and clay mineral) on the surface charge density was determined at two soil depth with different solid particle composition When the pH of solution increased, the negative charge of soil surface was increased among the all soils, but positive charge were not appeared above pH 6. apparently. The magnitude of surface charge density measured by NaCl adsorption method showed ra nges of $0.01{\sim}2.84cmol_c{\cdot}kg^{-1}$ and $7.41{\sim}12.20cmol_c{\cdot}kg^{-1}$ at pH 3 and pH 9, respectively. Ion adsorption method using KCl as index ion overestimated than the method using NaCl as index ion. The content of organic matter is the strongest factor on the value of dCEC/dpH.

• Journal of Life Science
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• v.21 no.12
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• pp.1710-1715
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• 2011

The bactericidal effect of nano plasma ion (NPi) which was generated by NPi was analyzed using different kinds of microorganisms, exposure times, chamber sizes, ion amounts and distance. As the result of Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus and Bacillus subtilis were shown different in decrement. Gram-negative bacteria E. coli showed the highest percentage (96.57%) and Gram-positive bacteria B. subtilis which produced spore has the lowest percentage (57.41%). From the exposure time of NPi most of the microorganisms were extinct at an early stage. According to the size of the chamber we compared the loss of E.coli and the experiment result shown, analyzed NPi using 5 chambers $0.005m^3$ to $30m^3$ for 2 hr, that when volume of the chamber increased, saturation ion and bactericidal effect was decreased. In addition, an NPi generator installed in the $1m^3$ chamber investigated the decrement of E. coli. Saturation ion concentration increased with decrement. Finally, E. coli showed a similar reduction according to the distance from NPi generator.

• Applied Biological Chemistry
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• v.47 no.4
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• pp.390-395
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• 2004

In order to characterize ion channels present in tomato roots, microsomes were incorporated into an artificial lipid bilayer arranged for electrophysiological analysis. Of the five different ion channels that could be found, a channel of 450 pS conductance was found most frequently. This channel displayed subconductance states of 450, 257 and 105 pS. All subconductance states showed linear current-voltage relationships. At positive holding potentials, high frequency of transient channel openings was observed; however, at negative potentials, the open times were long and open probability high. Po was 0.83 at -40 mV. When an additional 50 mM $K^+\;or\;Na^+$ was added to the cis side of bilayer, the reversal potentials shifted in the negative direction to near -10 mV. Thus, the 450 pS cation channel selects poorly between $K^+\;and\;Na^+$. In the presence of $100\;{\mu}M$ metal ions, the channel activity was severely inhibited by $La^{3+},\;Ba^{2+},\;and\;Zn^{2+}$, and Po was decreased to 0.2 or even less. However, $Al^{3+}\;and\;Cd^{2+}$ decreased the activity by only 20%. Interestingly, each metal ion showed different kinetics of channel inhibition. While $500\;{\mu}M\;La^{3+}$ inhibited the activities of all subconductance state, 1 mM $Zn^{2+}$ inhibited all except the 105 pS state. $Cd^{2+}$ changed the gating of the channel from a long-opening state to brief transient openings even at negative holding potentials. These data represent that the metal ions may have different binding sites on the channel protein and could be useful modulators and probes to investigate structural characteristics as well as the functional roles of the 450 pS channel on the root physiology.

• 전기의세계
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• v.29 no.8
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• pp.532-537
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• 1980

Effect of Argon and Sulfur hexafloride in the transformer oil are experimented under non-uniform A.C. electric field. The result has shown that the corona frequency and corona charge quantity in liquid dielectrics were varied with gas condition in the oil and affected by the additives. SF$_{6}$ that has the effects of pressure and electrical negative characteristic is the most effective. The corona is considered to be the breakdown of bubble produced by gas contained in the oil or by dissociated ion of the oil molecules.s.

• Proceedings of the Korean Vacuum Society Conference
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• 2007.02a
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• pp.153-153
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• 2007

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.951-956
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• 1998

The beam extraction system for the KOMAC[1] (Korea Multi-purpose Accelerator Complex) project is to be designed to partially extract H￣ beam at both 100 and 260 MeV This paper describes a simulation study of charge changing extraction with a stripper magnet and a possible design of a H$^{0}$ extractor by utilizing the simulation study The method consists of converting the negative hydrogen (H￣) ion beam from the linac to a chosen intensity (0-100%) of neutral hydrogen (H$^{0}$ ) beam having an acceptable omittance and drifting it directly onto a stripper foil followed by a downstream beamline.

• Korean Journal of Pharmacognosy
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• v.19 no.4
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• pp.248-250
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• 1988

The application of LC/MS system with FRIT-FAB LC/MS interface in both positive and negative ion modes to the analytical separation of isomeric saponins was studied. The two isomeric saponins such as rosamultin and arjunetin were well separated and analyzed FRIT, FAB LC/MS system. This is another examples to structure elucidation of natural products.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.07a
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• pp.84-87
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• 2001

Space charge formation at high temperature was investigated in several polymers using pulsed electro-acoustic (PEA) method. In SXLPE, homocharge is found and increased as an increase of temperature. In a charge of polarity of poling voltage(positive to negative), space charge mainly cause of hole injection. In Ionomer, heterocharge is found because of ion. As an increase of temperature heterocharge is also increased. In PET, As an increase of temperature homocharge is decreased.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2006.04a
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• pp.112-113
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• 2006

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2006.04a
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• pp.117-118
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• 2006