• Journal of Nutrition and Health
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• 제47권1호
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• pp.33-44
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• 2014

본 연구는 서울특별시에 소재한 한양대학교병원에서 혈액투석을 시행중인 만성 콩팥병 환자를 대상으로 일상식품군의 섭취량과 혈청 인, 칼륨 농도와의 상관관계를 살펴봄으로써 혈액투석 중의 합병증 예방 및 관리에 필요한 기초자료를 제공하고자 하였다. 1) 본 연구 대상자는 총 48명 (남: 20명, 여: 28명)으로 평균 혈청 인 농도는 $4.50{\pm}1.52mg/dl$, 평균 혈청 칼륨 농도는 $4.74{\pm}0.73mEq/l$였다. 전체 대상자 중 고인산혈증을 보인 환자는 45.8%, 고칼륨혈증을 보인 환자는 35.4%였다. 2) 식이요법 실천율은 남자가 여자보다 유의하게 높았고, 대상자 중 약물치료만 시행하는 군보다 약물치료에 식이요법을 병행하는 군에서 혈청 인 농도가 유의하게 낮았다. 3) 투석기간에 따른 혈청 칼륨 농도는 5년 미만 투석자보다 5년 이상 투석자에서 유의하게 높았다. 4) 백미를 섭취한 군이 잡곡을 섭취하는 군보다 혈청 인, 칼륨 농도가 유의하게 낮았다. 감자와 고구마의 섭취량이 증가할수록 혈청 칼륨 농도가 유의하게 높았으며, 일주일에 3회를 초과하여 섭취한 군의 경우 혈청 칼륨 농도가 정상범위를 넘어섰다. 5) 생선의 섭취량이 증가할수록 혈청 칼륨 농도가 유의하게 높았으며, 특히 일주일에 3회를 초과하여 섭취한 군의 경우 혈청 칼륨농도가 정상범위를 넘어섰다. 콩자반과 두유의 섭취량이 증가할수록 혈청 인 농도가 유의하게 높았으며, 콩자반의 경우 일주일에 1회 이상, 두유의 경우 일주일에 3회 보다 많이 섭취한 군의 경우 혈청 인 농도가 정상범위를 넘어섰다. 6) 채소의 섭취량이 증가할수록 혈청 칼륨 농도가 유의하게 높았으며, 특히 고칼륨 채소의 섭취가 많을수록 혈청 칼륨 농도가 유의하게 더 높았다. 버섯의 섭취량이 증가할수록 혈청 칼륨 농도가 유의하게 높았으며, 일주일에 3회 보다 많이 섭취한 군의 경우 혈청 칼륨 농도가 정상범위를 넘어섰다. 7) 잡곡과 두유의 섭취는 혈청 인 농도와 유의한 양의 상관관계를 보였으며, 투석기간, 잡곡, 감자, 생선, 고칼륨 채소의 섭취는 혈청 칼륨 농도와 양의 상관관계를 보였다. 한편 쌀의 섭취는 혈청 칼륨 농도와 유의한 음의 상관관계를 보였다. 이와 같은 결과를 통하여 혈액투석 환자들의 식이요법 실천은 혈청 인 농도 조절에 긍정적인 효과가 있었으며, 투석기간이 길어질수록 혈청 칼륨 농도가 높아지는 것으로 보아 지속적인 식이요법이 필수적인 것으로 생각된다. 일상식품군의 섭취와 혈청 인, 칼륨 농도와의 상관관계에서 잡곡의 섭취는 혈청 인, 칼륨 농도와 유의한 양의 상관관계를, 백미의 섭취는 혈청 칼륨 농도와 유의한 음의 상관관계를 보여주었다. 이를 통해 잡곡의 섭취를 줄이고 백미를 섭취하는 것이 혈청 인, 칼륨 농도 감소에 긍정적인 효과가 있는 것으로 나타났다. 두유의 섭취는 혈청 인 농도와 유의한 양의 상관관계를 보였으며, 감자 및 생선의 섭취는 혈청 칼륨 농도와 유의한 양의 상관관계를 보였다. 정상 혈청 인, 칼륨 농도의 유지를 위해서는 이들 식품의 1인 1회 섭취 분량을 하루에 0.5회 이하로 나누어 섭취하되, 일주일에 3회를 초과하여 섭취하지 않을 것을 권장한다. 한편 고칼륨 채소의 섭취는 혈청 칼륨 농도와 유의한 양의 상관관계를 보였으며, 다른 채소 섭취에 비해 혈청 칼륨 농도를 정상범위 이상으로 증가시키는 것으로 보아 가급적 섭취를 제한할 것을 권장한다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.409-412
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• 2000

In hybridoma cell culture, $NH_4\;^+$ is the most important toxic byproduct so far identified. It has been postulated that $NH_4\;^+$, which is similar to $K^+$ in size, is taken up non-specifically by the cells through a potassium transport system, and that the addition of $K^+$ to the culture medium may have a detoxifying effect of $NH_4\;^+$. Thus, in this study the effects of varying $Na^+/K^+$ ratios by adding potassium were investigated for hybridoma physiology and CHO cell morphology respectively. The possible use of potassium addition for the adaptation of CHO cells to suspension culture is discussed.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1510-1513
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• 2005

The luminescent properties of $Eu^{3+}$ and $Sm^{3+}$ doped potassium tungstate phosphor were investigated. The $K_{4-3x}(WO_4)_2:Eu_x$, $Sm_y$ phosphor was produced by firing the mixed precursors, followed by re-firing with a flux. The re-firing process provided the clean surface to the particles. The excitation spectra showed that the strong absorption in the region of ultra violet light occurred due to the high europium doping concentration. The incorporation of europium to potassium tungstate was easier, compared to other host materials. The excitation spectra could be controlled by the small addition of samarium. The increase of energy absorption around 405nm was assigned to the $Sm^{3+}$ ions. The comparison between real x-ray diffraction and simulated one revealed that the crystal structure of $K_{4-3x}(WO_4)_2:Eu_x,Sm_y$ phosphor is monoclinic with a space group, C2/c.

• Journal of Biosystems Engineering
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• 제32권1호
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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.

• 한국수산과학회지
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• 제9권3호
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• pp.163-168
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• 1976

부산시해운대연안에서 1975년 6월 23일 채취한 진두발, 지누아리 및 돌가사리의 3종류의 홍조류를 시료로 하여 이들 원조의 carrageenan함량과 이로부터 추출한 carrageenan의 $SO_4$ 및 3,6-anhydrogalactose의 함량, KCl 용액에 대한 용해도, KCl 논도별에 따라 분획한 획분의 3,6-anhydrogalactose의 함량에 대하여 조사검토하였다. 1. 원조별 carrageenan의 함량은 진두발이 가장 높고, 다음이 돌가사리, 지누아리의 순이었으며, 모두 $35\%$이상의 높은 함량을 보였다. 2. Carrageenan의 $SO_4$함량은 지누아리, 진두발, 돌가사리의 순으로 높았고, 3,6-anhydrogalactose의 함량은 반대로 돌가사리, 진두발, 지누아리의 순으로 높았다. 3. Carrageenan의 KCl 용액에 대한 용해도를 보면, 0.125 M KCl 농도에서 침전하는 비율은 진두발, 지누아리, 돌가사리의 Carrageenan 순으로 높았고, $0.125M\~2.0M$ KCl 농도에서 침전하는 비율은 돌가사리, 지누아리, 진두발의 carrageenan 순으로 높았으며, 2.0 M 이상의 KCl 농도에서도 용존하는 비율은 지누아리, 돌가사리, 진두발의 carrageenan 순으로 높았다. 4. Carrageenan을 0.0625 M와 0.25 M의 KCl 농도범위에서 3획분으로 분획하였을때, 각 획분의 수율은 진두발 및 돌가사리 carrageenan은 비슷한 경향을 보였고, 지누아리 carrageenan은 앞의 2종류에 비하여 가용획분의 수율이 많이 높았다. 5. 각획분의 $SO-4$ 및 3,6-anhydrogalactos 의 함량은 역상관관계를 나타내었고, KCl에 대한 용해도가 큰 획분일수록 $SO-4$ 함량이 높고 3, 6-angydrogalactose의 함량이 낮았다.

• International Journal of Industrial Entomology and Biomaterials
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• 제3권1호
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• pp.93-96
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• 2001

The effect of supplementation with potassium nitrate on biochemical constituents was analyzed following treatment of last larval stadium. The fat body glycogen and haemolymph trehalosre significantly increased in all the treated groups. The fat body and haemolymph protein also increased significantly in all the treated groups except 500 ${\mu}g$/ml where increased fat body protein and decreased haemolymph protein were not significant. The total lipids, phospholipids and neutral lipids of the fat body increased significantly in all the groups except 50 and 300 ${\mu}g$/ml where the fat body phospholipids increased but the increase was not significant. However the total lipids, phospholipids and neutral lipids are significantly decreased in 500 ${\mu}g$/ml treated group when compared with that of the carrier control.

• 대한의생명과학회지
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• 제16권4호
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• pp.259-264
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• 2010

This study was designed to investigate the effects of nitric oxide on the neuronal activity of rat cerebellar Purkinje cells. Sprague-Dawley rats aged 14 to 16 days were decapitated under ether anesthesia. After treatment with pronase and thermolysin, the dissociated Purkinje cells were transferred into a chamber on an inverted microscope. Spontaneous action potentials and potassium current were recorded by standard patch-clamp techniques under current and voltage-clamp modes respectively. 15 Purkinje cells revealed excitatory responses to $20\;{\mu}M$ of sodium nitroprusside (SNP) and 4 neurons (20%) did not respond to SNP. Whole potassium currents of Purkinje cells were decreased by SNP (n=10). Whole potassium currents of Purkinje cells were also decreased by L-arginine, substrate of nitric oxide (n=10). These experimental results suggest that nitric oxide increases the neuronal activity of Purkinje cells by altering the resting membrane potential and after hyperpolarization.

• International Journal of Industrial Entomology and Biomaterials
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• 제1권1호
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• pp.47-52
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• 2000

The effect of supplementation with potassium nitrate on economic parameters was analysed following treatment of last larval stadium. The treated larvae showed a significant increase in larval weight at 500$\mu\textrm{g}$/ml and silk gland weight in all the treated groups along with other enhanced larval, cocoon and adult parameters. The larval period was significantly decreased in all the treated groups with increased female and male cocoon weights its shell weights filament lengths at 500$\mu\textrm{g}$/ml. The denier was significantly decreased in all the groups. The filament weight moth emergence percentaged length of the ovariole were unaffected. However, eggs per ovariole, fecundity and hatching percentage significantly decreased compared with the corresponding parameters of the carrier control.

• Nutrition Research and Practice
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• 제4권2호
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• pp.155-162
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• 2010

Epidemiological evidence of the effects of dietary sodium, calcium, and potassium, and anthropometric indexes on blood pressure is still inconsistent. To investigate the relationship between dietary factors or anthropometric indexes and hypertension risk, we examined the association of systolic and diastolic blood pressure (SBP and DBP) with sodium, calcium, and potassium intakes and anthropometric indexes in 19~49-year-olds using data from Korean National Health and Nutrition Examination Survey (KNHANES) III. Total of 2,761 young and middle aged adults (574 aged 19~29 years and 2,187 aged 30~49 years) were selected from KNHANES III. General information, nutritional status, and anthropometric data were compared between two age groups (19~29 years old and 30~49 years old). The relevance of blood pressure and risk factors such as age, sex, body mass index (BMI), weight, waist circumference, and the intakes of sodium, potassium, and calcium was determined by multiple regression analysis. Multiple regression models showed that waist circumference, weight, and BMI were positively associated with SBP and DBP in both age groups. Sodium and potassium intakes were not associated with either SBP or DBP. Among 30~49-year-olds, calcium was inversely associated with both SBP and DBP (P = 0.012 and 0.010, respectively). Our findings suggest that encouraging calcium consumption and weight control may play an important role in the primary prevention and management of hypertension in early adulthood.

• Clinical and Experimental Pediatrics
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• 제61권9호
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• pp.271-278
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• 2018

Purpose: Abnormal potassium channels expression affects vessel function, including vascular tone and proliferation rate. Diverse potassium channels, including voltage-gated potassium (Kv) channels, are involved in pathological changes of pulmonary arterial hypertension (PAH). Since the role of the Kv1.7 channel in PAH has not been previously studied, we investigated whether Kv1.7 channel expression changes in the lung tissue of a monocrotaline (MCT)-induced PAH rat model and whether this change is influenced by the endothelin (ET)-1 and reactive oxygen species (ROS) pathways. Methods: Rats were separated into 2 groups: the control (C) group and the MCT (M) group (60 mg/kg MCT). A hemodynamic study was performed by catheterization into the external jugular vein to estimate the right ventricular pressure (RVP), and pathological changes in the lung tissue were investigated. Changes in protein and mRNA levels were confirmed by western blot and polymerase chain reaction analysis, respectively. Results: MCT caused increased RVP, medial wall thickening of the pulmonary arterioles, and increased expression level of ET-1, ET receptor A, and NADPH oxidase (NOX) 4 proteins. Decreased Kv1.7 channel expression was detected in the lung tissue. Inward-rectifier channel 6.1 expression in the lung tissue also increased. We confirmed that ET-1 increased NOX4 level and decreased glutathione peroxidase-1 level in pulmonary artery smooth muscle cells (PASMCs). ET-1 increased ROS level in PASMCs. Conclusion: Decreased Kv1.7 channel expression might be caused by the ET-1 and ROS pathways and contributes to MCT-induced PAH.