• Korean Journal of Environment and Ecology
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• v.24 no.6
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• pp.735-743
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• 2010

In order to inspect growth responses of Fraxinus rhynchophylla Hance, Koelreuteria paniculata Laxmann, Quercus acutissima Carruther and Ulmus parvifolia Jacquin to NaCl treatment, NaCl solution was treated for four months with 0, 25, 50, 100 and 200 mM concentrations, then survival rate, change of relative growth rate, weight, dry weight and pigment content of leaf were investigated. According to NaCl treatment, pH and EC (electrical conductivity) of soil increased, and growth rates of four tree species fell apparently as treatment time became longer. U. parvifolia had the highest survival rate with 15% in the 200mM treatment, and the other three species withered in the treatment. Relative growth rate, weight and dry weight decreased when NaCl treatment time grew longer. The total chlorophyll declined after it rose to 60 days, and the total chlorophyll and carotenoid of the all species according to NaCl treatment did not change very much. With the result from anlayzing growth responses of four tree species to oxidative stress which occurs during NaCl treatment, U. parvifolia has the highest tolerance, followed by K. paniculata, F. rhynchophylla and Q. acutissima.

• Membrane and Water Treatment
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• v.4 no.1
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• pp.69-81
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• 2013

The pH-dependent inter-conversion of the three free chlorine species ($Cl_2$, HOCl, OCl-) present in the aqueous hypochlorite solution was theoretically investigated. Each species was found overwhelmingly present in a characteristic pH range. Hypochlorite treatment of the polyamide membrane was carried out over these pH ranges and various membrane responses were observed. As pH is less than 8, membrane tends to be N-chlorinated by $Cl_2$ and HOCl, and N-chlorinated membrane showed reduced water permeance and salt rejection. As pH rises to 10-12, $OCl^-$ appears to be the dominating chlorine species. Membrane hydrolysis was found to well interpret the improved water permeance and salt rejection. When the pH is between 8-10, both N-chlorination and hydrolysis contribute to the response of the membrane, and the treated membrane showed improved salt rejection but reduced water permeation. Excessive hydrolysis occurred while the membrane was treated at pH 13 for the much stronger alkalinity.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.04a
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• pp.122-122
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• 2003

다슬기의 분말(PSB)과 그 회화분(ASB)으로부터 체내 흡수력이 높은 젖산칼슘의 제조조건과 색상, 용해도 및 관능적 품질을 조사하였다. PSB로부터 제조한 젖산칼슘(PSB-CL)의 PSB 및 젖산 100 mL에 대한 수율은 젖산농도가 10%일 때는 300% 및 15 g, 20%일 때는 260% 및 20 g이었으며, ASB로 제조한 젖산칼슘(ASB-CL)의 ASB 및 젖산 100 mL에 대한 수율은 10% 젖산에서는 400% 및 60 g, 20% 젖산에서는 329% 및 66 g으로 원료량을 기준으로 하였을 때는 다같이 젖산농도의 증가에 따라 감소하였으나 젖산의 부피를 기준으로 하였을 때는 젖산농도의 증가에 따라 증가하였다. Dehydated PSB-CL 및 ASB-CL 제조의 적정온도와 시간은 10$0^{\circ}C$에서는 각각 4 및 5시간, 12$0^{\circ}C$에서는 3 및 4시간, 15$0^{\circ}C$에서는 1 및 2시간으로 ASB-LA의 경우가 짧았다. IR 및 H-NMR spectrum의 분석결과 PBS-LA와 ASB-LA의 구조는 Ca($CH_3$CHOH$CO_2$)$_2$임이 확인되었다. 무수 PSB-CL 및 ASB-CL의 칼슘함량은 각각 15.4%(w/w)와 17.3%(w/w)로 이론 값의 각각 84.2%와 94.5%를 나타내었으며, 미량의 Fe, Na, Mn Zn을 함유하였다. PBS-CL와 ASB-CL의 색상은 각각 연한 황색과 연녹색을 지닌 백색을 띠었다. pH 3~8로 조정한 증류수에서 PSB-CL과 ASB-CL의 평균 용해도는 각각 5.43 g/100 mL 및 6.11 g/100 mL로 standard CL의 4.74 g/mL에 비하여 높았다. 국간장을 제외한 대부분의 액체식품(3% 소금물, 소주, 진간장, 국간장, 포도주스 및 오렌지주스)에서의 용해도는 PSB-CL(3.14~5.03 g/100 mL)과 ASB-CL(4.69~6.05 g/100 mL)이 standard CL(2.94~5.84 g/100 mL)에 비하여 높았다. 관능검사 결과, ASB-CL은 신맛이 낮아 사용범위가 높은 것으로 평가되었으며 PSB-CL는 쓴맛은 높으나 떫은맛이 낮고 구수한 맛이 강하여 식품에의 응용이 기대된다.

• Journal of the Korean Chemical Society
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• v.25 no.6
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• pp.394-398
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• 1981

Two types of Ni(II)-polyethyleneimine (PEI) complexes, [Ni(PEI)]$Cl_2$ and [Ni(P-EI)$Cl_2$] were synthesized and their catalytic activities in the decomposition reaction of hydrogen peroxide were investigated. For the purpose of comparison, the corresponding monomeric complexes, $[Ni(en)_3]Cl_2$ and $[Ni(en)_2Cl_2$ were also prepared; it was observed that their activities increase in the following order; $0{\approx}[Ni(en)_3]Cl_2{\le}[Ni(en)_2Cl_2]<[Ni(PEI)]Cl_2<[Ni(PEI)Cl_2]$ On the basis of structural analysis by means of visible and infrared spectroscopy, the catalytic activiy of these Ni(II)-PEI complexes is assumed to depend on the bond strength between the ligand and the nickel ion.

• Journal of Electrochemical Science and Technology
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• v.13 no.2
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• pp.279-291
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• 2022

In this report the thermochemical conversion of Sm₂O₃ to SmCl₃ using AlCl₃ in LiCl-KCl melt at 773 K is discussed. The final product was a mixture of SmCl₃, Al₂O₃, unreacted Sm₂O₃ and AlCl₃ in the chloride melt. The electrochemical attributes of the mixture was analyzed with cyclic voltammetry (CV) and square wave voltammetry (SWV). The crystallographic phases of the mixture were studied with X-ray diffraction (XRD) technique. The major chemical conversion was optimized by varying the effective parameters, such as concentrations of AlCl₃, duration of reaction and the amount of LiCl-KCl salt. The extent of conversion and qualitative assessment of efficiency of the present protocol were evaluated with fluorescence spectroscopy, UV-Vis spectrophotometry and inductively coupled plasma atomic emission spectroscopy (ICP-AES) studies of the mixture. Thus, a critical assessment of the thermochemical conversion efficiency was accomplished by analysing the amount of SmCl₃ in LiCl-KCl melt. In the process, a conversion efficiency of 95% was achieved by doubling the stoichiometric requirement of AlCl₃ in 50 g of LiCl-KCl salt. The conversion reaction was found to be very fast as the reaction reached equilibrium in 15 min.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.6
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• pp.858-861
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• 2001

Near Infrared spectroscopy was applied to the samples of processed pork to see the effect of grinding on chemical components analyses. Data from conventional chemical analyses of moisture, fat, protein, NaCl were put into calibration model by NIR of reflectance mode. The other properties observed were pH and color parameters ($L^*,\;a^*,\;b^*$). Spectral ranges of 400~2500 nm and 400~1100 nm were compared for color parameters. Spectral ranges of 400~2500 nm and 1100~2500 nm were compared for chemical components and pH. Different spectral ranges caused little changes in the coefficients of determination or standard errors. $R^{2,}s$ of calibration models for color parameters were in the range of 0.97 to 1.00. $R^{2,}s$ of calibration models of intact sausages for moisture, protein, fat, NaCl and pH were 0.98, 0.89, 0.95, 0.73 and 0.77, respectively using spectra at 1100~2500 nm. $R^{2,}s$ of calibration models of ground sausages for moisture, protein, fat, NaCl and pH were 0.97, 0.91, 0.97, 0.42 and 0.56, respectively using spectra at 1100~2500 nm.

• Journal of Ecology and Environment
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• v.29 no.1
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• pp.29-34
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• 2006

Three macrophytes species, that are, Phragmites australis, Zizania latifolia and Typha angustifolia were grown in mono culture in order to compare growth (relative biomass increase rate), variation of photosynthetic pigment (total chlorophyll, Chl a, Chl b and Chl a/Chl b) and effectiveness of nutriment removal in 15%o NaCl-salt solution or processed-leachate (salinity 19.6%o) from sanitary landfill sites. The relative biomass increase rate of p. australis was significantly higher than Z. latifolia and T. angustifolia. In the case of processed-leachate treatment, the relative biomass increase rates of above-part, rhizome and root of P. australiswere 178 %, 148 % and 157 %, respectively. Also, in 15%o NaCl-salt solution treatment, the relative biomass increase rates of P. australis increased as follows; 161 % (above-part), 183 % (rhizome) and 112 % (root). Total chlorophyll contents increased significantly in the leaves of P. australis and Z. latifolia grown in 15%o NaCl-salt solution and processed-leachate. Among three macrophytes, P. australis was evaluated as most effective macrophyte for the biological retreatment of processed-leachate from sanitary landfill sites.

• Journal of Korean Society of Forest Science
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• v.100 no.2
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• pp.142-148
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• 2011

This study was carried out to clarify the change characteristics of stream water quality by type of forest from June to August, 2009 in three stands (Castanea crenata, Pinus densiflora and Plantation Land) of Samgye-ri Naedong-myeon Jinju-si Gyeongsangnam-do. The pH of stream water in three stands was highest in Pinus densiflora (pH 7.18) followed by Castanea crenata (pH 6.90) and Plantation land (pH 6.90) while the electrical conductivity of stream water was highest in Plantation land followed by Castanea crenata stand and Pinus densiflora stand was the lowest. Cations contents of stream water in three stands were high in order of $Ca^{2+}$, $Na^{+}$, $Mg^{2+}$, $K^{+}$, and $NH_{4}{^{+}}$. But anions of stream water in Castanea crenata stand and Pinus densiflora stand were high in order of $SO_{4}{^{2-}}$, $Cl^{-}$ and $NO_{3}{^{-}}$ while those of stream water in Plantation land were high in order of $SO_{4}{^{2-}}$, $NO_{3}{^{-}}$ and $C\lambda^{-}$. The stream water in three stands was significant at pH, EC, $NO{^{3-}}$, $Ca^{2+}$, $Mg^{2+}$, $Na^{+}$, $Cl^{-}$, TNU and Color by duncan test. These results indicate that quality of stream water have a difference among three stands. The level of pH, $NH_{4}{^{+}}$, $Cl^{-}$, $SO_{4}{^{2-}}$ and $NO_{3}{^{-}}$ of stream water in three stands were within the domestic use standard for drinking water. but turbidity and color of stream water were more than that of domestic use standard for drinking water. Therefore, non-point sources like urban forest watersheds which are soil erosion and fertilizer application lands should be taken to the appropriate mitigation measures if they are to be used as source of drinking water.

• Korean Journal of Crystallography
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• v.10 no.2
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• pp.119-124
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• 1999

X-선 회절법을 이용하여 3,6-bis(6'-methyl-2'pyridyl)pyridazine을 리간드로 한 Zn(Ⅱ) 착물인 [3,6-bis(6'-methyl-2'pyridyl)pyridazine]ZnCl2 (C16H16N4·ZnCl2)의 결정구조를 규명하였다. 이 결정의 결정계는 Monoclinic이며 공간군은 P21/a이다. 단위포 상수는 a=15.053(7) Å, b=14.594(7) Å, c=7.628(3) Å이며, β=93.92(4)°, V=1671.9(13) Å3, T=293(2)K, Z=4, Dc=1.594 Mgm-3이다. 회절반점들의 세기는 Enraf-Nonius CAD-4 diffractometer로 얻었으며 Mo Kα선(λ=0.71073 Å)을 사용하였다. 분자구조는 직접법으로 풀었으며, Fo>4σ (Fo)인 1750개의 독립 회절 데이터에 대하여 최소승자법으로 정밀화하여 최종 신뢰도 값 R=8.31%을 얻었다.

• The Journal of Korean Medicine
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• v.19 no.2
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• pp.450-467
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• 1998

To research the characteristics of ion currents induced by inhibitory and excitatory herbs of oriental medicine, we used nystatin-perforated patch clamp technique under voltage clamp condition in periaqueductal gray neuron dissociated from Sprauge-Dawley rat, 10-15 days old. The results are as follows. 1. Ion current induced by $10mg/m{\ell}$ of Bupleuri Radix was inhibited $59.50{\pm}4.29%$ by $10^{-4}M$ bicuculline(p>0.01) but inhibition of $10.75{\pm}4.77%$ by $10^{-4}M$ tubocurarine and $4.75{\pm}4.23%$ by $10^{-4}M$ verapamil had no statistical significance(p>0.05). So ion current induced by Bupleuri Radix revealed only GABA induced $Cl^-$ current, not acetylcholine and $Ca^{2+}$ current. 2. Ion current induced by $20mg/m{\ell}$ of Coptidis Rhizoma was inhibited $47.20{\pm}7.88%$ by $10^{-4}M$ bicuculline(p<0.01) but $3.20{\pm}2.33%$ inhibition by $10^{-4}M$ tubocurarine and $1.00{\pm}1.00%$ inhibition by $10^{-4}M$ verapamil had no significance(p>0.05). So ion current induced by Coptidis Rhizoma revealed only GABA induced $Cl^-$ current, not acetylcholine and $Ca^{2+}$ current. 3. Ion current induced by $20mg/m{\ell}$ of Ecliptae Herba was inhibited $55.00{\pm}4.92%$ by $10^{-4}M$ bicuculline (p<0.01), and also inhibited $15.00{\pm}4.26%$ by $10^{-4}M$ tubocurarine(p<0.05), but inhibition of $6.00{\pm}3.03%$ by $10^{-4}M$ verapamil had no significance(p>0.05). So ion current induced by Ecliptae Herba showed GABA activated $Cl^-$ current and acetylcholine activated cation current, not $Ca^{2+}$ current 4. Ion current induced by $5mg/m{\ell}$ of Liriopis Tuber was inhibited $15.20{\pm}4.57%$ by $10^{-4}M$ bicuculline<0.05) and also inhibited $14.00{\pm}3.00%$ by $10^{-4}M$ tubocurarine(p<0.05), but inhibition of $5.20{\pm}4.80%$ by $10^{-4}M$ verapamil had no significance(p>0.05). So ion current induced by Liriopis Tuber showed GABA. activated $Cl^-$ current and acetylcholine activated cation current, not $Ca^{2+}$ current. 5. Ion current induced by $5mg/m{\ell}$ of Aconiti Tuber was inhibited $97.00{\pm}1.34%$ by $10^{-4}M$ bicuculline(p<0.01), $80.00{\pm}9.83%$ by $10^{-4}M$ tubocurarine(p<0.01), and $24.00{\pm}6.18%$ by $10^{-4}M$ verapamil(p<0.05). So ion current induced by Aconiti Tuber revealed GABA activated $Cl^-$ current and acetylcholine activated cation current and $Ca^{2+}$ current. 6. Ion current induced by $10mg/m{\ell}$ of Zingiberis Rhizoma was inhibited $33.00{\pm}7.43%$ by $10^{-4}$ bicuculline(p<0.05), $10.20{\pm}1.83%$ by $10-^{-4}M$ tubocurarine(p<0.01), and $14.00{\pm}2.16%$ by $10^{-4}M$ verapamil(p<0.01) So ion current induced by Zingiberis Rhizoma revealed GABA activated $Cl^-$ current and acetylcholine activated cation outtent and $Ca^{2+}$ current. 7. Ion current induced by $10mg/m{\ell}$ of Boshniakiae Herba was inhibited $65.00{\pm}13.75%$ by $10^{-4}M$ bicuculline(p<0.05), $38.00{\pm}9.24%$ by $10^{-4}M$ tubocurarine(p<0.05), and $33.25{\pm}7.42%$ by $10^{-4}M$ verapamiHp<0.05). So ion current induced by Bpshniakiae Herba revealed GABA activated $Cl^-$ current and acetylcholine activated cation current and $Ca^{2+}$ current. These results suggest that a point of difference between inhibitory and excitatory herbs is existence of$Ca^{2+}$ current.