• Title, Summary, Keyword: calcium ion

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Preparation of Calcium Alginate Fiber by Ion Exchange (이온교환에 의한 칼슘알지네이트 섬유의 제조)

  • Son, Tae-Won;Lee, Min-Gyeong;Han, Song-Jeong
    • Textile Coloration and Finishing
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    • v.23 no.1
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    • pp.51-59
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    • 2011
  • Calcium alginate fiber were prepared by wet spinning of various conditions, including different concentrations of sodium alginate solution and $CaCl_2$ concentrations for coagulating the fiber through an absorption of calcium ion. The absorption of calcium ion during the coagulating step lead to solidify the fibers by the replacement of sodium ion with calcium ion to produce some crosslinking. The concentration of calcium ion in the calcium alginate fiber seems to be well related to the mechanical and physical property of the fiber, such as fiber strength moisture regain, and degree of swelling. The tensile strength of calcium alginate fiber was increased along with the increasing amount of sodium alginate solution. According to EDS analysis, 7 wt% $CaCl_2$ coagulation bath resulted in more calcium ion in the fiber compared to 3 wt% $CaCl_2$ coagulation bath. The decomposition temperature of calcium alginate fiber was $199^{\circ}C$, which $14^{\circ}C$ higher than that of sodium alginate.

Calcium Movement in Carbachol-stimulated Cell-line (Calcium수송기전에 미치는 Carbachol의 영향)

  • Lee, Jong-Hwa
    • The Korean Journal of Pharmacology
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    • v.31 no.3
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    • pp.355-363
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    • 1995
  • It has been well known that the intracellular calcium concentration $([Ca^{2+}]_i)$ in living cell is very sensitive to live or to survive, but the transmembrane system of calcium ion, especially mechanism of calcium ion movement in unexcitable state has been little elucidated. Though many proposed theories for calcium ion transport have been reported, it is still unclear that how could the sustained maintenance in cytosolic calcium level be done in cell. Since one of possible mechanisms of calcium transport may be related to the acetylcholine receptor-linked calcium channel, author performed experiment to elucidate this mechanism of calcium influx related to cholinergic receptor in ml muscarinic receptor-transfected RBL-2H3 cell-line. 1) The effects of carbachol both on calcium ion influx and on the secretion of hexosaminidase were respectively observed in the manner of time-related or concentration-dependent pattern in this model. 2) The effects of several metal cations on calcium transport were shown in carbachol-induced cell-line. 3) Atropine was administered to examine the relationship between cholinergic receptor and calcium ion influx in this model. 4) PMA (Phorbol 12-myristate 13-acetate) or PTx (Pertussis toxin) was respectively administered to examine the secondary mediator which involved pathway of calcium ion movement in carbachol-induced cell-line. The results of this experiments were as follows; 1) Carbachol significantly stimulated both the calcium influx and the secretion of hexosaminidase in the manner of the concentration-dependent pattern. 2) Atropine potently blocked the effects of carbachol in concentration-response manner. 3) Administered metal cations inhibited the calcium influx in carbachol-stimulated this model to the concentration-related pattern. 4) PMA did not inhibit carbachol-induced secretion of hexosaminidase, but blocked the calcium influx in this cell-line. 5) The suppression of carbachol-induced hexosaminidase secretion was shown in PTx-treated cell -line.

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Effects of Vanadate on the intracellular Calcium ion activities in mvocardial cells (심근세포내 칼슘 이온 활용도에 미치는 Vanadate 의 효과)

  • Lee, Jeong-Ryeol;Kim, U-Gyeom
    • The Korean Journal of Thoracic and Cardiovascular Surgery
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    • v.21 no.2
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    • pp.291-298
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    • 1988
  • The effect of Vanadate on the isometric contraction, membrane potential and intracellular calcium ion activities of rabbit myocardial cells were investigated, using calcium selective microelectrode, filled with neutral calcium ion carrier, ETH-1001. The resting tension, the membrane potential and the intracellular calcium ion activities were recorded in normal Tyrode solution and compared with those in the contracture induced by 10 mM Vanadate. The following results were obtained: 1. The dose-response relationship between the contraction of Vanadate and twitch tension showed near-maximum response in 5mM with no corresponding changes in action potential. 2. The resting tension increased up to the amplitude of a control twitch in 10mM Vanadate with resting membrane potential, hyperpolarized. 3. Increase in intracellular calcium ion activities proceeded the contracture by 10mM Vanadate which were restored to the control level in accordance with a decrease of intracellular calcium ion activities. 4. The amplitude of contractures by 10mM Vanadate were 90-120% of the control twitch tension in which the intracellular calcium ion activities were increased about 70 times from p Ca, 7.1 in the control to p Ca, 5.8 in contractures.

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A Study on Biosorption of Calcium Ion Using Aerobic Granular Sludge (호기성 그래뉼 슬러지를 이용한 칼슘이온의 생물흡착에 관한 연구)

  • Kim, Hyun-Gu;Ahn, Dae-Hee
    • Journal of Environmental Science International
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    • v.28 no.8
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    • pp.677-687
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    • 2019
  • This study evaluated the biosorption properties of calcium ion using Aerobic Granular Sludge (AGS). A sequencing batch reactor was used to induce the production of Extracellular Polymeric Substances (EPS) through salinity injection, and the calcium ion adsorption efficiency was analyzed by a batch test. The EPS contents showed significant changes (104-136 mg/g MLVSS) at different salinity concentrations. The calcium ion adsorption efficiency was highest for AGS collected at 5.0% salinity, and it was confirmed that the biosorption efficiency of AGS was increased owing to the increase in EPS content. The results of the Freundlich isotherms showed that the ion binding strength (1/n) was 0.3941-0.7242 and the adsorption capacity ($K_f$) was 2.4082-3.3312. The specific surface area and the pore size of the AGS were $586.1m^2/g$ and 0.7547 nm, respectively, which were not significantly different from each other. It was confirmed that the influence of biological properties, such as EPS content, was relatively large among the factors affecting calcium ion adsorption.

A Study on the Biological Treatment of Acid Pickling Wastewater Containing a High Concentration of Nitrate Nitrogen (고농도 질산성 질소를 함유한 산세폐수의 생물학적 처리에 관한 연구)

  • Park, Sang Jin;Lee, Sang Houck
    • Journal of Korean Society on Water Environment
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    • v.31 no.3
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    • pp.253-261
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    • 2015
  • The purpose of this study is the efficient biological treatment of highly concentrated nitrate nitrogen by calcium ion control present within the pickling wastewater. In laboratory scale's experiments research was performed using a sequencing batch reactor and the evaluation of denitrification reaction in accordance with the injection condition of calcium ions, the surface properties of microorganisms, and the evaluation of sludge precipitability were performed. Results of the study showed that the denitrification reaction was delayed when injecting more than 600 mg/L of the calcium ion within the denitrification process. In addition, we observed the absorption form of calcium ions absorbed on the surface of microorganisms following an increase in the calcium ion dose. It was found that as the calcium ion dose increased the sludge precipitability also increased continuously and it is judged that a smooth denitrification induction is possible when treating the nitrate nitrogen by the calcium ion control of pickling waste water and the shortening of precipitation time enables a liquid operation to increase the reaction time.

Potentiometric performances of polymer membrane electrode based on cyclosporin (싸이크로스포린을 이용한 고분자막 전위차 전극)

  • Rhee Paeng, Insook
    • Analytical Science and Technology
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    • v.18 no.6
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    • pp.491-494
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    • 2005
  • The main component governing selectivity in ion-selective electrodes and optodes is the ionophore. For this reason, a member of natural products that possess selective ion-binding properties have long been sought after. By applying this principle, the performance of cyclosporin used as neutral carriers for calcium selective polymeric membrane electrode was investigated. The calcium ion-selective electrode based on cyclosporin gave a good Nernstian response of 26.6 mV per decade for calcium ion in the activity range $1{\times}10^{-6}M$ to $1{\times}10^{-2}M$. The optimized calcium ion-selective electrode displayed very comparable selectivity for $Ca^{2+}$ ion against alkali and alkaline earth metal ions, $Na^{2+}$, and $Mg^{2+}$ in particular.

Serum Total Calcium, Ionized Calcium Ion and Lipid Compositions in Hypertensive Koreans (정상인과 고혈압 환자의 식이 Calcium 섭취빈도와 혈청의 Calcium 수준과 지질조성의 비교)

  • 박광희
    • Journal of Nutrition and Health
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    • v.22 no.6
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    • pp.476-484
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    • 1989
  • An epidemiological survey was made on dietary calcium intake, serum total calcium and ionized calcium ion, and serum lipid compositions. Compared with 120 normotensive controls, 101 hypertensive subjects were significantly higher in the levels of serum cholesterol and triglyceride, but lower in HDL-cholesterol and higher in the ratio of total choesterol/HDL-chol Hypertensive subjects were also significantly lower in the relative amount of fatty acids C18:2 but higher in those of C20:0, C20:2 and total amount of saturated fatty acids(longer than C14:0) than control serum. Patients were significantly lower in serum total calcium and ionized calcium ion concentrations and significantly less calcium ingestion from milk and dairy produces by feeding frequency test.

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Inhibition Effects of $Ca^{2+}$ and $F^-$ Ion on Struvite Crystallization ($Ca^{2+}$$F^-$ 이온이 Struvite 결정화 반응에 미치는 영향)

  • Kim, Seung-Ha;Kim, Keum-Yong;Ryu, Hong-Duck;Lee, Sang-Ill
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.7
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    • pp.730-737
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    • 2010
  • It is very important to remove fluoride ion before treating semiconductor wastewater containing high concentration of ammonia, phosphates, and fluoride ions by struvite formation. Calcium ion was generally added for the removal of fluoride ion. However, calcium ions remained after removal of fluoride ion can deteriorate the performance of struvite crystalization. It should be removed completely before struvite formation. In this study, the effect of fluoride and calcium ion concentration on the struvite crystalization was investigated. Removal efficiencies of ortho-phosphate with struvite formation were more abruptly decreased than those of ammonium nitrogen, as increase of fluoride ion concentration in synthetic wastewater. The structures of struvite formed in synthetic wastewater containing calcium ion of up to 500 mg/L were identical. Purity of struvite was deteriorated as increase of calcium ion over 500 mg/L. Removal efficiencies of ammonium nitrogen were more decreased than those of phosphate ions as increase of cacium ion in synthetic wastewater.

Application of Ion-Selective Electrodes to Measure Ionic Concentrations of Macronutrients in Hydroponics (수경재배 시 다량 이온 농도 측정을 위한 이온 선택성 전극의 응용)

  • Kim, Min-Su;Park, Tu-San;Cho, Seong-In
    • Journal of Biosystems Engineering
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    • v.32 no.1
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    • pp.37-43
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    • 2007
  • This study was carried out to investigate the applicability of PVC membrane-based ion-selective electrodes for macronutrients (K, Ca, and N) by measuring of potassium, calcium, nitrate ions in hydroponic nutrient solution. The capabilities of two ion-selective membranes with varying chemical compositions for each ion were evaluated in terms of sensitivity, selectivity, and lifetime to choose sensing elements suitable for measuring typical ranges of nutrient concentrations in hydroponic solutions. The selected calcium and nitrate ion-selective membranes showed effectively sensitive responses to calcium and nitrate ions with lifetimes of 25 and 15 days, respectively. The addition of a cation additive to the potassium membrane cocktail allowed its sensitivity to be increased whereas its lifetime was reduced from 30 days to 10 days.

Effect of Ruthenium Red and Ryanodine on Calcium Ion Metabolism in Oocyte and Early Embryo of Mouse (생쥐의 난자와 초기배아의 칼슘이온 대사에 미치는 Ruthenium Red와 Ryanodine의 영향)

  • Lee Joon Yeong;Hong Soon Cap;Kim Tae Sik;Min Byeong Yeol;Kim Haekwon;Yoon Yong-Dal
    • Development and Reproduction
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    • v.7 no.2
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    • pp.95-103
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    • 2003
  • Intracellular calcium is an important physiological factor in most cells, and ruthenium red and ryanodine play an important role as calcium modulators. Ruthenium red inhibits calcium-induced calcium release(CICR) from the intracellular calcium store. Ryanodine activates calcium release through ryanodine channel. The present experiment was performed to investigate the effects of two modulators on calcium ion metabolism and to determine their dose-dependency in oocyte and early embryo of mouse. Intracellular calcium ion concentration was measured in realtime by using confocal laser scanning microscope(CLSM) after loading of Fluo-3/AM in mouse oocytes and early embryos. Ruthenium red decreased intracellular calcium ion concentration in oocytes and early embryos at its high concentration(30, 300 $\mu$M). Ryanodine increased intracellular calcium ion concentration in oocytes and early embryos in low concentration(0.01 $\mu$M) but decreased that at higher concentrations(1, 10 $\mu$M). These results indicate that two modulators affected calcium ion metabolism in oocyte and early embryo of mouse, and their dose-dependency was different from somatic cell including myocytes.

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