• YAKHAK HOEJI
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• v.41 no.5
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• pp.666-671
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• 1997

We studied effects of genistein and tyrphostin, inhibitors of tyrosine kinase, on contractions induced by high $K^+$ and norepinephrine in rat aorta. Genistein $(10^{-6}{\sim}10^{-4}M)$ and tyrphostin ($(10^{-5}{\sim}10^{-4}M)$) inhibited high $K^+$ and norepinephrine-induced sustained contractions, respectively in a concentration-dependent manner. High $K^+$ and norepinephrine caused an increase in $^{45}Ca^{2+}$ uptake while $10^{-4}M$ genistein and tyrphostin inhibited the $K^+$ and norepinephrine-increased $^{45}Ca^{2+}$ uptake, respectively. These results show that inhibitor of tyrosine kinase blocks the voltage-and receptor-operated $Ca^{2+}$ channels in rat aorta, respectively.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.11a
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• pp.26-26
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• 1998

• Resources Recycling
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• v.11 no.2
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• pp.45-51
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• 2002

This study was performed to investigate removal efficiency of wastewater by the prepared coagulant using waste oyster shell and loess. Waste oyster shell and loess contain respectively high CaO(55.43% by weight), $SiO_2$(45.30% by weight). Waste oyster shell was calcined to improve the purity of CaO at the calcination condition of $900^{\circ}C$ for 2hours, and then crushed 0.074 mm(200mesh) size by ball mill. Also, coagulant was prepared with calcined waste oyster shell and loess powder by hydration reaction. Calcined waste oyster shell and loess powder were combined with mixing ratio of 6 : 4, 7:3, 8:2 and 9:1. Though comparison experiment between prepared coagulant and chemical )$Ca(OH_2$, prepared coagulant was proved as having replaceable possibility of chemical )$Ca(OH_2$in wastewater treatment plant.

• The Journal of Natural Sciences
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• v.18 no.1
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• pp.55-63
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• 2007

This research was conducted to investigate the effects of calcium solution spray on the accumulation of calcium into apple fruit. $^{45}_{CaCl_2}$ applied to fruit with different growth stages showed that more $^{45}Ca$ was penetrated into fruits when applied in the late stage than early stage. Slight radioactivity was detected only in pedicel except leaf when $^{45}Ca$ was treated on the leaves proximate to the fruit. When the Ca was treated on fruit surface only, calcium contents of fruit was increased.

• Asian Journal of Turfgrass Science
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• v.13 no.4
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• pp.191-200
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• 1999

The objective of this study was to improve the recycling rate of coal ash fly, industrial waste. This study was conducted to analyze the physico-chemical properties of \"CellCaSi\" and clarify the effects on the growth of Kentucky bluegrass(Poa pratensis L.) and creeping bentgrass(Agrostis paulstris Huds \"Penncross\") and the chemical properties of soil, which was cellular calcium silicate reproduced by coal ash fly. A field assay was carried out in Young-Pyong Golf Course. The results were as follows. 1. The main chemical composition of CellCaSi was $SiO_2$(45~55%) and CaO(25~35), which was 70~90% of total weight. CellCaSi showed pH 8~9. Bulk density of CellCaSi was 0.35~0.45g/㎤. Water content of CellCaSi was 52.5~67.5%. 2. In the applied plots, leaf width, grass density per $1\textrm{cm}^2$, rhizome number and length per plant, and root number per plant of Kentucky bluegrass(Poa pratensis L.) and creeping bentgrass(Agrostis paulstris Huds \"Penncross\") showed increasing tendency compared with the control. The application of CellCaSi increased the growth of turfgrasses. Their visual quality on hardness, grass shoot density per $1\textrm{cm}^2$ and root growth was very good. And, their visual quality on rhizome growth was good. 3. After the application of CellCaSi, pH, CEC, Ex-cation of the applied soil showed increasing tendency with the little range, $SiO_2$content increasing tendency considerably, and organic matter content decreasing tendency compared with the control.ncy compared with the control.

• Journal of the Korean Ceramic Society
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• v.23 no.2
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• pp.38-42
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• 1986

The adsorption behavior of 3CaO.$Al_2O_3$-sodium gluconate-$H_2O$ system by measuring adsorp-tion isotherm DTA and IR sepctra. The adsorbed amount of sodium gluconate on 3CaO.$Al_2O_3$ is exceedingly larger than 3CaO.$SiO_2$ and portland cement. From the DAT experiment the formation of complex is observed by the characteristic exothermic peak of the complex at 45$0^{\circ}C$ It is now strong deduced that the chemical bonding between gluconate anion and 3CaO.$Al_2O_3$ should be coordinative due to the complex formation on the surface 3CaO.$Al_2O_3$ from the IR spectra of sod-ium gluconate only and 3CaO.$Al_2O_3$ -sodium gluconate-$H_2O$.

• YAKHAK HOEJI
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• v.35 no.1
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• pp.11-14
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• 1991

Ro09-0198, a cyclic peptide isolated from culture filtrates of Streptoverticillium griseove-rticillatum, induced platelet aggregation and serotonin release simultaneously. LDH release was not observed. Addition of peptide to rat platelet, loaded with $Ca^{2+}$ chelator quin-2, caused immediate rise in cytosolic free $Ca^{2+}$. Liposomal membrane containing phosphatidylethanolamine was damaged by peptide and released $^{45}Ca$ dose dependently.

• Food Science and Preservation
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• v.13 no.1
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• pp.13-17
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• 2006

The strawberry was dipped into $1\%\;CaCl_2$ solution at $20^{\circ}C\;and\;45^{\circ}C$ for 15min. respectively, and then packaged with or without PE film (thickness: 0.011mm) before putting into the cold storage at $5^{\circ}C$. The results showed the lowest rate of rot incidence and the highest firmness with higher Vitamin C content and the best superficial appearance in the treatment of $CaCl_2$ dipping at $45^{\circ}C$ with packaging. It also showed lower pH and higher titratable acidity in the treatment However, no significant difference of SSC was found among various treatments. The results suggested that the combination of postharvest calcium dipping and packaging could result in more effective preservation for strawberry compared with the individual treatment.

• Korean Journal of Veterinary Research
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• v.13 no.1
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• pp.5-12
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• 1973

Seventy two guinea pigs were divided into 3 groups; 24 each of control, unilateral thyro-parathyroidectomized and bilateral thyro-parathyroidectomized groups. After the intraperifoneal in jection of $16{\mu}Ci$ of radioactive calcium ($^{45}Ca$) $^{45}Ca$ uptake of various organs and tissues were measured at the 8th, 16th, 24th and 36th hours, respectively, 18 animals were slaughtered (6 from each group) each time. The results obtained were as follows: 1. It was shown that each organ and tissue of treated animals had higher $^{45}Ca$ uptake than the control group, and the bilateralectomized group, higher than the unilateralectomized group, generally. However, there were some exceptions of the findings. The unilateralectomized group had higher $^{45}Ca$ uptake than the bilateralectomized group in case of adrenal gland and femur at the 8th hour; adrenal gland and blood at the 16th hour; spleen, pancreas, adrenal gland, femur and skeletal muscle at the 24th hour; and pancreas, femur and skeletal muscle at the 36th hour, respectively. 2. $^{45}Ca$ uptakes of each organ and tissue were also determind with respect to time. The results were varied with each treatment group, but generally the highest uptake was shown at the 8th hour and decreased gradually thereafter. The differences were not, however, statistically significant. 3. Femur had shown the highest $^{45}Ca$ uptake and the next were blood, pancreas, liver, skeletal muscle and spleen respectively, and the least were adrenal gland and liver, even though there were some variations in the results. 4. The differences in $^{45}Ca$ uptake of each organ and tissue for the treatment group were statstically significant as compared with the test of the control group, except the spleen and blood at the 8th hour; liver at the 16th hour; adrenal gland, spleen, pancreas at the 24th hour; and spleen at the 36th hour.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.20 no.1
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• pp.19-24
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• 2007

The effects of $B_2O_3-SiO_2-R(R;CaO,\;BaO,\;ZnO,\;Bi_2O_3)$ borosilicate glass system on the sintering behavior and microwave dielectric properties of ceramic/glass composites were investigated as functions of modifier, glass addition ($30{\sim}50\;vol%$) and sintering temperature ($500{\sim}900^{\circ}C$ for 2 hrs). The addition of 50 and 45 vol% glass ensured successful sintering below $900^{\circ}C$. Sintering characteristics of the composites were well described in terms of modifier. Borosilicate glass enhanced the reaction with $Al_{2}O_{3}$ to form pores, second phases and liquid phases, which was responsible to component of modifier. Dielectric constant (${\varepsilon}_{r},\;Q{\times}f_{o}$) and temperature coefficient of resonant frequency (${\tau}_{f}$) of the composite with 50 and 45 vol% glass contents($B_{2}O_{3}:SiO_{2}:R=25:10:65$) demonstrated A-CaBS(7.8, 2,560 GHz, -81ppm/$^{\circ}C$), A-BaBs(5.8, 3.130 GHz, -64 ppm/$^{\circ}C$), A-ZnBS(5.7, 17,800 GHz, -21 ppm/$^{\circ}C$), A-BiBs(45 vol% glass in total)(8.3, 2,700 GHz, -45 ppm/$^{\circ}C$) which is applicable to substrate requiring an low dielectric properties.