• 한국잠사곤충학회지
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• 제17권2호
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• pp.161-170
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• 1975

This study is to investigate the content of crude protein intruded in the sericin of cocoon shell and pupa by treatment of buffer solution (pH 1 to pH 13) 20 ml per 1 gram for 30 and 60 minutes at 30$^{\circ}C$, 60$^{\circ}C$ and 100${\pm}$2$^{\circ}C$, respectively. The results obtained are summarized as follows. 1. The quantity of total crude protein obtained from cocoon shell and pupa by treatment during 30 minutes at 30$^{\circ}C$ was dissolved as the largest quantity of 11.874 mg/g at pH 1 and l5.93mg/g at pH 13, but dissolved the smallest quantity 1.75g/g at pH 5 as known. and tile quantity of crude protein treated for 60 minutes is 13.437mg/g at pH 1 and 22.50mg/g at pH 13. Also, the smallest quantity is 2. 813mg/g at pH 5 as known. 2. By the treatment during 30 minutes at 60$^{\circ}C$, the dissolved largest quantity was 13.12mg/g at pH 1 and 21.875 mg/g at pH 13, but the smallest quantity is 2.375mg/g at pH 5 as known After treatment for 60 minutes at 60$^{\circ}C$, the dissolved largest quantity was 17.500 mg/g at pH 1 and 31.56mg/g at pH 13, bu the smallest quantity is 3.849 mg/g at pH 5. 3. The dissolved crude protein from the cocoon shell and pupa by treatment for 30 minutes at 100${\pm}$2$^{\circ}C$ was the largest quantity of 147.000mg/g at pH 1 and 398. 125mg/g at pH 13, but the smallest quantity is 75.00mg/g at pH 5 as known. After treatment for 60 minutes at 100${\pm}$2$^{\circ}C$, the largest quantity was 253.76 mg/g at pH 1 and 460.625mg/g at pH 13, but the smallest quantity is 139.375mg/g at pH 5 as known. 4. The dissolved crude protein from the cocoon shell and pupa was not different in quantity by treatment at 30$^{\circ}C$ or 60$^{\circ}C$. But dissolved crude protein was large quantity from cocoon shell more than pupa, as known. 5. The treatment of cocoon shell and pupa during 60 minutes at 100${\pm}$20$^{\circ}C$ was increased to the dissolved largest quantity of crude protein of 19.20％ at pH 1 and 22. 18％ at pH 13 from the cocoon shell and 6. 12％ at pH, an d 23.87％ at pH 13 from the pupa. But dissolved crude protein was increased to the larger quantity from pupa more than cocoon shell.

• 한국의류학회지
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• 제29권11호
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• pp.1454-1464
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• 2005

The study was based on a three-stage, non-repetitive factorial experiment in which chemical-rotted kenaf fibers were treated separately with hydrogen peroxide concentrations of $0.5\%,\;1\%\;and\;2\%$, with pH solutions of 7, 9 and 11, and treatment times of 30, 60 and 90 minutes. Under optimal conditions, the study was conducted to determine the strength and elongation of kenaf fibers by the addition of chelators, penetrants and surfactants. The hydrogen peroxide concentration, solution pH and treatment time directly affected the strength of kenaf fibers. The hydrogen peroxide concentration, solution pH affected the elongation of kenaf fibers. It was found, however, that the interaction between pH and treatment time, concentration and treatment time, concentration and treatment time and pH affected the strength of kenaf fibers. Also, It was found that the interaction between pH and concentration, concentration and treatment time, concentration and treatment time and pH affected the elongation of kenaf fibers. Under the hydrogen peroxide conditions of $2\%$ concentration, pH 11 and a treatment time of 60 minutes, there were no effects on the strength and elongation of kenaf fibers with the addition of chelator SP, CA.

• 한국농공학회지
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• 제44권2호
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• pp.99-106
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• 2002

This study is performed to examine pH reduction by neutralization treatment and curing condition of porous concrete using rice straw ash for planting. Test results show that pH of porous concrete without neutralization treatment in the dry and water curing is 10.34 ∼ 10.57 and 9.42 ∼ 9.72, respectively. pH of porous concrete by neutralization treatment in the dry and water curing is 9.72 ∼ 10.03 and 9.00 ∼ 9.37, respectively. Accordingly, the best method for pH reduction of porous concrete for planting is to use water curing and neutralization treatment.

• 한국의류산업학회지
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• 제5권4호
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• pp.389-394
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• 2003

Dyeing properties of silk fabric with leaf Mustard was investigated the relation with pH variation, mordants, mordant method. K/S value shows the following sequence: pH 3>pH 5>pH 7>pH 9. K/S value shows high in post mordant conditions. Silk fabric shows the green, blue tone according to mordants(Al, Cu, Fe mordants). The tannic acid treatment silk fabric shows higher than the nontannic acid treatment silk fabric in K/S value. Lighting fastness of tannic acid treatment silk fabric shows better than that of nontannic acid treatment in Cu, Fe mordants. Water fastness of tannic acid treatment silk fabric was wholly improved. Tannic acid treatment improved dyeing properties of silk fabric with leaf Mustard.

• Membrane and Water Treatment
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• 제4권1호
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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.

• 한국환경농학회지
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• 제15권2호
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• pp.207-216
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• 1996

인공산성비의 pH가 낮아질수록 고추씨의 발아에 걸리는 시간은 단축되었으며 발아율은 향상되었으나 어린 싹에게는 매우 치명적인 영향을 미쳤다. 어린 고추모는 이미 자란 식물체에 비하여 산성비에 훨신 더 민감하게 작용하였다. 산성비의 전형적인 가시피해증상은 잎에 나타나는 흰색 반점이었으며, 빗물의 pH가 낮을수록 더 빨리 더 심하게 나타났다. 고추의 역병은 일반적으로 인공산성비 처리구에서 대조구보다 빨리 발병하였으나, 인공산성비의 pH가 아주 낮을 때는 다른 처리구에 비하여 오히려 병의 발생이 줄어들었다. 인공산성비 처리중에 역병을 접종하였을 때는 처리 전에 접종하였을 때보다 병이 더 빨리, 더 심하게 나타났다. 역병의 발생이 가장 심했던 것은 역병의 접종시기와는 관계없이 pH 4.0 또는 4.5인 빗물을 처리하였을 때였다.

• 상하수도학회지
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• 제23권1호
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• pp.39-46
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• 2009

A method to improve water treatment efficiency by coagulant overdosing for high pH raw water at a drinking water treatment plant (WTP) which had no pH adjusting facilities was investigated. Poly aluminum chloride (PACl) was used for coagulant, and turbidity removal efficiency was evaluated as a function of PACl dosage increases. pH and turbidity of supernatant of jar-tester were 7.10 and 0.50 NTU respectively, when the turbidity, pH, alkalinity, water temperature, conductivity of raw water were 1.75 NTU, 9.38, 46.5 mg/L, $6.4^{\circ}C$, $400{\mu}s/cm$, respectively. Turbidity of settled water was reduced from 2.18 NTU to 0.28 NTU (87% reduction) when PACl dosage was increased from 16 mg/L to 45 mg/L at a full scale WTP. This can be attributed to the recovery of coagulant efficiency by pH reduction with the increase of coagulant dose, however coagulation efficiency was reduced with the formation of Al(OH)4- by PACl addition at higher pH. Coagulant overdosing was proven to be a rapid and effective method for high pH raw water, which can be applied at drinking WTP.

• 한국물환경학회지
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• 제24권4호
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• pp.415-422
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• 2008

Drinking water treatment is enhanced by coagulant dosages and chlorine injection because of pH increase in raw water in droughty seasons such as spring and fall. But water quality deterioration is occurred by increase in residual aluminium and disinfection by-products. Coagulation process can be used to control natural organic matter (NOM) during water treatment. The effect of coagulation process appeared to depend on the pH of water rather than coagulant dosages. In this study, for water treatment in high pH season $H_2SO_4$ was applied for pH adjustment at full scale. Before and after pH adjustment by $H_2SO_4$ injection, water quality of drinking water was evaluate. In the result of investigation of total organic carbon (TOC) removal in high pH season, TOC was removed approximately 30~40%, which showed decrease in water treatment efficiency. Also, it is increased both particle numbers and residual Al concentration in the water. After $H_2SO_4$ injection for adjustment to pH<7.5 in settled water, treated water turbidity decreased in 0.047 NTU from 0.059 NTU, and particle numbers of filtered water decreased in 20/mL from 90/mL. On the other side, TOC removal efficiency increased in approximately 10% after adjustment of pH. In the result of decrease in pH in raw water through more coagulants and prechlorine without $H_2SO_4$ injection, trihalomethanes (THMs) concentration increased in $16{\mu}g/L$ from $8{\mu}g/L$.

• 식물병연구
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• 제16권1호
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• pp.81-85
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• 2010

산성비 수준의 고농도 수소이온 스트레스인 pH 5.6-4.0 처리는 애기장대 생장에 크게 해를 주지 않았으며 강산성인 pH 3.5 이하에서 수소이온 농도가 높아질수록 식물 뿌리 및 줄기의 생장이 위축되었으며 특히 뿌리가 줄기보다 더 민감하게 반응하였다. 엽록소 함량은 pH 5.6-4.0까지 pH가 낮아질수확 증가히였다. pH 4.0에서 내려갈수록 점진적으로 엽록소 함량이 감소되는 경향을 보였으며 카로티노이드도 엽록소와 같은 경향을 보였으나 pH 3.5에서 함량이 가장 높았다. 안토시아닌은 pH가 낮아질 수록 계속 증가하여 pH 3.0에서 가장 많이 축적되었으며 pH 2.5에서는 급격히 감소되었다. 스트레스 강도가 세어 질수록 엽록소 대비 식물체내 카혹티노이드 및 안토시아닌 함량이 증가한다는 것은 엽록소를 보호하기 위한 식물의 생리적 반응으로 여겨진다. 그러나 안토시아닌과 카로티노이드는 수소이온 농도에 따른 식물체내 함량의 변화가 상이하여서 고수소이온 스트레스에서 식물의 보호하는 기작이 다를 것으로 에상된다.

• 대한물리치료과학회지
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• 제6권4호
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• pp.173-178
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• 1999

The purpose of this study was to determine the effect of High Voltage Pulsed Current on pH in the healing wound bed. Seven adults, four males and three females, were studied with a total of fifty-five viable treatment sessions. Using a Cardy Digital pH meter, we measured the pH in the wound bed following saline rinse both prior to treatment and after a forty-five minute treatment. Analysis of all viable records(n=54) did not show a significant change in pH(p=0.82). The mean pH change in NoN-Smokers(-0.14) was more acidic when compared to the mean pH change in smokers(0.27) which was more alkaline.