• Title/Summary/Keyword: High-potassium

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Manufacturing of Korean Traditional Handmade Paper with Reduced Fiber Damage(III)-Potassuim Carbonate Cooking of Paper Mulberry (Broussonetia Kazinoki Sieb) (섬유의 손상이 적은 한지 제조(제 2보) -닥나무 백피의 K2CO3 증자 특성)

  • 문성필;임금태
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.3
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    • pp.83-89
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    • 1999
  • Bast fibers of paper mulberry ( Broussonetia Kazinoki Sieb) were cooked with a weak alkaline salt, potassium carbonate which has been known as a major inorganic component of the traditional lye, and its cooking characteristics were investigated . The bast fiber was easily cooked by potassium carbonate. The pulp yield was rapidly decreased up to 20-30 mol of potassium carbonate, but the Kappa number was slowly decreased with increasing of potassium carbonate. The potassium carbonate pulps were easily defibered at low cooking chemical charge of 25mm on and high pulp yield of about 80%. These results were confirmed that pectin was easily removed during the potassium carbonate cooking. In contrast, when sodium carbonate was used as a cooling agent, the bast fiber was only partially defibered. Thus, sodium carbonate was a less effective cooling chemical of the bast fiber. The results of this experiment indicated that potassium carbonate could not only be used as a good cooling agent of bast fiber, but also as an alternative agent of sodium hydroxide.

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Sensing Nitrate and Potassium Ions in Soil Extracts Using Ion-Selective Electrodes (이온선택성 전극을 이용한 토양추출물의 질산 및 칼륨이온 측정)

  • Kim, H.J.;Sudduth Kenneth A.;Hummel John W.
    • Journal of Biosystems Engineering
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    • v.31 no.6 s.119
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    • pp.463-473
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    • 2006
  • Automated sensing of soil macronutrients would allow more efficient mapping of soil nutrient spatial variability for variable-rate nutrient management. The capabilities of ion-selective electrodes for sensing macronutrients in soil extracts can be affected by the presence of other ions in the soil itself as well as by high concentrations of ions in soil extractants. Adoption of automated, on-the-go sensing of soil nutrients would be enhanced if a single extracting solution could be used for the concurrent extraction of multiple soil macronutrients. This paper reports on the ability of the Kelowna extractant to extract macronutrients (N, P, and K) from US Corn Belt soils and whether previously developed PVC-based nitrate and potassium ion-selective electrodes could determine the nitrate and potassium concentrations in soil extracts obtained using the Kelowna extractant. The extraction efficiencies of nitrate-N and phosphorus obtained with the Kelowna solution for seven US Corn Belt soils were comparable to those obtained with IM KCI and Mehlich III solutions when measured with automated ion and ICP analyzers, respectively. However, the potassium levels extracted with the Kelowna extractant were, on average, 42% less than those obtained with the Mehlich III solution. Nevertheless, it was expected that Kelowna could extract proportional amounts of potassium ion due to a strong linear relationship ($r^2$ = 0.96). Use of the PVC-based nitrate and potassium ion-selective electrodes proved to be feasible in measuring nitrate-N and potassium ions in Kelowna - soil extracts with almost 1 : 1 relationships and high coefficients of determination ($r^2$ > 0.9) between the levels of nitrate-N and potassium obtained with the ion-selective electrodes and standard analytical instruments.

An association of urinary sodium-potassium ratio with insulin resistance among Korean adults

  • Park, Yeong Mi;Kwock, Chang Keun;Park, Seyeon;Eicher-Miller, Heather A.;Yang, Yoon Jung
    • Nutrition Research and Practice
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    • v.12 no.5
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    • pp.443-448
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    • 2018
  • BACKGROUND/OBJECTIVES: This study was conducted to investigate the effects of sodium-potassium ratio on insulin resistance and sensitivity in Korean adults. SUBJECTS/METHODS: Subjects were 3,722 adults (1,632 men and 2,090 women) aged 40-69 years participating in the Korean genome and epidemiology study_Ansan and Ansung study. Insulin resistance was assessed using homeostasis model assessment of insulin resistance (HoMA-IR) and fasting insulin, and insulin sensitivity was assessed by using the quantitative insulin sensitivity check index (QUICKI). The 24-h urinary sodium and potassium excretion were estimated from spot urinary samples using the Tanaka formula. The generalized linear model was applied to determine the association between urinary sodium-potassium ratio and insulin resistance. RESULTS: HoMA-IR (P-value = 0.029, P-trend = 0.008) and fasting insulin (P-value = 0.017, P-trend = 0.005) levels were positively associated with 24-h estimated urinary sodium-potassium ratio in the multivariable model. QUICKI was inversely associated with 24-h estimated urinary sodium-potassium ratio in all models (P-value = 0.0002, P-trend < 0.0001 in the multivariate model). CONCLUSION: The present study suggests that high sodium-potassium ratio is related to high insulin resistance and low insulin sensitivity. Decreasing sodium intake and increasing potassium intake are important for maintaining insulin sensitivity. Further studies are needed to confirm these findings in longitudinal studies.

A Study on the Effect of the Rhizobacterium, Bacillus sp. SH1RP8 and Potassium Family Polymers on the Crop Growth under Saline (염 환경 하에서 Bacillus sp. SH1RP8와 Polyacrylate Polymers가 작물 생장에 미치는 영향에 관한 연구)

  • Hong, Sun Hwa;Kim, Ji Seul;Park, Jang Woo;Lee, Eun Young
    • KSBB Journal
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    • v.30 no.3
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    • pp.97-102
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    • 2015
  • This study aimed to evaluate the potential plantgrowth promoting effects of potassium polyacrylate, a superabsorbent polymer, and Bacillus sp. SH1RP8, a family of plant-growth-promoting bacteria. Potassium polyacrylate was selected as the polymer for use due to its high molecular weight and its ability to retain and continuously supply moisture. Plant-growth-promoting rhizobacteria (PGPR) were isolated from the soil and applied to plants growing in dry environments, such as saline conditions. The moisture absorption and retention abilities of potassium polyacrylate were evaluated at a high temperature ($50^{\circ}C$) and in a dry condition, during which time the polymer showed a water retention potential of 19606.07% after 29 days. To overcome the reaming problem in the soil environment, natural polymers (such as cellulose) were mixed with the potassium acrylate. The shoot growths of Peucedanum japonicum Thunb and Arundo donax were significantly enhanced when treated with the mixture of the isolated rhizosphere bacterium SH1RP8 and potassium polyacrylate (63.5 and 124.3%, respectively).

Effect of Potassium Sorbate and Sodium Acid Pyrophosphate on Microbiological and Physicochemical Characteristics of Chicken (Potassium Sorbate와 Sodium Acid Pyrophosphate가 닭고기의 미생물과 이화학적 특성에 미치는 영향)

  • 김미라
    • Journal of the East Asian Society of Dietary Life
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    • v.6 no.2
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    • pp.187-194
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    • 1996
  • Changes of the growth of microorganisms, pH, and TBA values were examined for chickens treated with 5% potassium sorbate, 5% sodium acid pyrophosphate, and mixture of 2.5% potassium sorbate and 2.5% sodium acid pyrophosphate solution during 15 days at 4$^{\circ}C$. Treatment of the mixture solution inhibited synergistically the growth of mesophilic and psychrotrophic bacteria and suppressed effectively enteric bacilli. Potassium sorbate treatment was the most effective on inhibition of the growth of yeast and mold. The extension of lag phase for psychrotrophic bacteria and enteric bacilli was observed by the treatment of the mixture solution of potassium sorbate plus sodium acid pyrophosphate and the potassium sorbate solution. PHs of chickens were increased during the storage, which might induce the decline of antimicrobial effect. Sodium acid pyrophosphate was expected to give antioxidant effect as well as antimicrobial effect for high fat foods because the lowest increase of TBA value for chickens treated nth sodium acid pyrophosphate was measured.

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Changes in the Nitrate Assimilation and Ascorbic Acid Content of Spinach Plants Treatmented with Nutrient Solutions Containing High Nitrogen and Low Potassium (고질소 및 저 칼륨 양액처리시 시금치내의 비타민C및 질소 대사의 변화)

  • Park, Yang-Ho;Seo, Beom-Seok
    • Korean Journal of Soil Science and Fertilizer
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    • v.42 no.4
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    • pp.301-306
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    • 2009
  • This study was conducted to determine the physiological differences betweenhealthy and wilted plants with respect to nitrate assimilation and ascorbic acid content. Wilting was artificially induced in spinach plants by treating the seeds with nutrient solution containing high nitrogen and low potassium. The plants were cultured in different plots 4 types of media: 1N-1P-1K (control), 6N-1P-0K (0K), 6N-1P-0.5K (0.5K), and 6N-1P-2K (2K). The rate of wilting among the plants was as follows: control, 0%; 2K, 10%; 0.5K, 40%; and 0K, 70%. This shows that under high nitrogen conditions, the lower the amount of potassium provided, higher was the rate of wilting. There were no differences in plant growth among the plants treated with different levels of potassium under high nitrogen conditions.The nitrate content in both the leaves and the roots was higher in plants grown under high nitrogen media than those in the control. Furthermore, the nitrate level decreased with increasing potassium concentration. The ascorbic acid content of spinach under high nitrogen conditions was lower than those of the control.

Potassium Distribution in the Apical Region of Rice Root

  • Rehman Shafiq;Park Moung-Ryoul;Ashraf Muhammad;Yun Song-Joong
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.51 no.4
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    • pp.295-297
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    • 2006
  • Potassium (K) distribution in rice (Oryza sativa L.) root was studied by confocal laser microscopy, using potassium sensitive fluorescent dye potassium-binding benzofuran isophthalate (PBFI). Significantly high intensity of K-specific fluorescence was detected at the root cap region followed by meristematic and basal regions. A negligible or fainted fluorescence was observed at the root hairs area. These results suggest that K is heavily distributed in the apical area of rice root, which may be required in higher concentration for division and extension of cells, as it is the rapidly growing region of the root, moreover, may also be involved in water uptake by creating osmotic gradient across membranes.

Case Report of Potassium Bromide Therapy for Canine Epilepsy Patient (Potassium bromide를 적용한 개의 epilepsy 치료에 관한 증례)

  • 김민규;방동하;황철용;윤화영;한홍율
    • Journal of Veterinary Clinics
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    • v.20 no.4
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    • pp.516-518
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    • 2003
  • Six year-old female shihtzu was presented as primary epileptic seizure. We had been treated with high dose phenobarbital sodium (6.5 mg/kg), but could not achieved adequate control seizures. In an add-on therapy, the dog was given potassium bromide at a dose of 20 to 40 mg/kg daily for a period of 24 months. This dog has showed a greater than 50% reduction in seizure frequency. The therapeutic range of serum concentration of potassium bromide was from 0.7 to 1.3 mg/ml at 6weeks after treatment. To begin an add-on therapy with potassium bromide it can be recommended at a daily dose of 20 to 40 mg/kg.

Ecotoxicity Assessment of Potassium Hydrogen Phthalate and Verification of Standard Reference Toxicity Test Method Using Potassium Hydrogen Phthalate

  • Dong Jin Choi
    • Proceedings of the National Institute of Ecology of the Republic of Korea
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    • v.4 no.1
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    • pp.49-62
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    • 2023
  • Phthalates are animal carcinogens. Potassium hydrogen phthalate (KHP), which has the least complicated structure among phthalates, is used for the analysis of total organic carbon and formaldehyde. However, its toxicity has not been confirmed. A 24-hour acute toxicity test was performed using Daphnia magna, a water flea used to evaluate aquatic toxicity owing to its high sensitivity. The lowest observed effect concentration of KHP was found to be 240 mg/L. The effects of phosphorus, nitrogen, and Cr(6+), which are able to be discharged along with KHP, were also confirmed using tests. At 240 mg/L KHP, toxicity increased as phosphorus, nitrogen, and Cr(6+) increased. In addition, tests were performed to confirm the half maximal effective concentration of KHP. Through 10 test repetitions, the average ecotoxicity value was found to be 0.3, the average half maximal effective concentration was 327.75 mg/L, and the coefficient of variation (%) was 3.16%; because the latter value is lower than 25%, which is what is generally suggested for the water pollution standard method, the reproducibility of the tests is sufficient to replace the existing standard reference toxicity test that uses potassium dichromate. In addition, the half maximum effective concentration of potassium hydrogen phthalate is approximately 218 times more than that of potassium dichromate; therefore, toxicity is relatively low. In conclusion, KHP is a feasible alternative to the highly toxic potassium dichromate for performing the standard reference toxicity test.

Potassium Rate and Mowing Height for Kentucky Bluegrass Growth

  • Lee, Sang-Kook
    • Weed & Turfgrass Science
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    • v.5 no.4
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    • pp.268-273
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    • 2016
  • Potassium is well-known to improve turfgrass tolerance to environmental stresses such as low temperature and drought stress. Low mowing height reduces leaf area of turfgrass that is main place for photosynthesis and carbohydrate production. Closely-mowed turf would suffer from summer decline by low level of carbohydrate resulted from low photosynthesis of reduced leaf area. The objective of the study is to investigate K rate and mowing height for Kentucky bluegrass. The K rate treatments were 5, 10, and $20g\;K_2O\;m^{-2}$ for the low, medium and high K rates, respectively. The bi-weekly mowing treatment was made for treatments. Mowing was implemented at 40 and 100 mm using a rotary mower. Regardless K rates, the high mowing height would be required when the air temperature is higher than $28.5^{\circ}C$ and high turfgrass quality of Kentucky bluegrass is needed. When the air temperature is optimal for cool-season grass, the high mowing height and the low K rate is needed for the root length of Kentucky bluegrass.