• The Korean Journal of Physiology
• /
• 제10권1호
• /
• pp.15-24
• /
• 1976

The action of aconite on the sodium plus potassium activated ATPase activity in the rabbit red cell membrane has been investigated and the experiments were also designed to determine the mechanism of action of aconite on the ATPase activity. The following results were observed. 1. The activity of the NaK ATPase from red cell membrane is stimulated by aconite, and the concentration of aconite for maximal activity is about 80 mg%. The pH optimum for the aconite sensitive component is 8.0. 2. The activating effect of aconite on the ATPase, with a given concentration of sodium in the medium, is increased by raising the potassium concentration but activity ratio is decreased. 3. The activating effect of aconite on the ATPase, with a given concentration of potassium in the medium, is increased by raising the sodium concentration but activity ratio is decreased. 4. The action of aconite on the ATPase activity is inhibited by calcium ions and the effect of inhibition is increased by small amounts of calcium but decreased by larger amounts. 5. The activating effect of aconite on the ATPase was not related to the sulfhydryl group of cysteine, the amino group of lysine, the hydroxyl group of threonine or the imidazole group of histidine. 6. The action of aconite on the ATPase activity is due to carboxyl group of the enzyme of NaK ATPase.

• Asian-Australasian Journal of Animal Sciences
• /
• 제23권7호
• /
• pp.880-888
• /
• 2010

The ameliorative effect of salts and ascorbic acid polyphosphate supplementation on heat stress was studied in buffaloes. Adult buffaloes of either sex were randomly divided into 2 groups of 4 animals each. Group I served as control and Group II was supplemented with sodium bicarbonate, potassium carbonate and ascorbic acid polyphosphate. All the animals were exposed to two conditions of temperature and humidity: hot-dry and hot-humid in a psychrometric chamber for 4 h daily for 10 days. Blood was collected on day 1, 5 and 10 of treatment. The activities of catalase and superoxide dismutase (SOD), concentrations of serum glutathione (GSH), cortisol, sodium, potassium, and chloride and lipid peroxidation were estimated in serum. Lymphocyte proliferation was assessed in blood. The activities of catalase and SOD, serum concentration of GSH, sodium, potassium and chloride decreased while lipid peroxidation and serum cortisol increased in both groups when subjected to heat stress. Dietary supplementation resulted in further decreasing of the enzyme activities but increasing of the serum concentrations of GSH, sodium, potassium and chloride. Lipid peroxidation and serum cortisol increased in the supplemented group in both types of stress. Dietary supplementation caused an increase in lymphoproliferative response to con A. Thus, supplementation of ascorbate in addition to electrolytes relieves the animals of oxidative stress and boosts cell mediated immunity.

• The Plant Pathology Journal
• /
• 제20권4호
• /
• pp.277-282
• /
• 2004

Amendments of a recirculating nutrient solution with potassium silicate were evaluated as a means to control Phytophthora capsici infections on pepper plant(Capsicum annuum L.). Supplying the solutions with 100 or 200 ppm of silicate significantly reduced motility, root decay, and yield losses attributed to infection of P. capsici. Treating inoculated plants with potassium silicate increased root dry weights and number of fruit, especially high-grade fruit. Results were slightly superior to non-inoculated controls. The two varieties, PBC 137 and PBC 602, responded similarly to the treatments. No significant differences were observed between the 100- and 200 ppm silicate treatments. Results were better when greenhouse conditions favored the spread of P. capsici. Silicon alone did not increase pepper yield, suggesting that it acts as a disease suppression agent rather than as a fertilizer, The phenomena by which silicon confers protection against P. capsici infection and disease development are not fully understood, but our results indicate that mechanisms other than a mechanical barrier to fungal penetration are involved.

• 한국토양비료학회지
• /
• 제2권1호
• /
• pp.49-51
• /
• 1969

시비기(施肥期)를 5단계(段階)로 구분(區分)하여 각시험구(各試驗區)마다 대두(大豆)의 생육과정(生育過程)에 따른 K의 흡수대사과정(吸收代謝過程)을 구명(究明)하였다. 함유율(含有率)은 시비기(施肥期)의 조지(早遲)에 관계(關係)없이 수확기(收穫期)에 있어서의 치(値)는 그다지 큰 차(差)를 볼 수 없었다. 그러나 비교적(比較的) 빠른 시기(時期)에 시비(施肥)한 시험구(試驗區)에서는 K의 공급(供給)은 전탄수화물(全炭水化物)의 합성(合成)을 촉진(促進)하고 있는 점(點)을 나타냈고 비교적(比較的) 늦은 시기(時期)에 시비(施肥)한 시험구(試驗區)에서는 가용성당(可溶性糖)의 감소(減少)는 물론(勿論), 가용성질소(可溶性窒素) 및 단백태질소(蛋白態窒素)의 감소(減少)도 나타냄으로서 K의 공여(供與)와 질소동화(窒素同化)와의 관계(關係)도 고찰(考察)하였다.

• The Korean Journal of Physiology
• /
• 제12권1_2호
• /
• pp.15-23
• /
• 1978

The action of ascorbic acid on the sodium Plus potassium activated ATPase activity in the rabbit red cell membrane has been investigated and the experiments were also designed to determine the mechanism of action if ascorbic acid on the ATPase activity The following results were observed. 1. The activity of the NaK ATPase from red cell membrane is stimulated by ascorbic acid and the concentration of ascorbic acid for maximal activity is about 8 mM. 2. The activating effect of ascorbic acid on the ATPase activaty, with a given concentration of sodium in the medium, is increased by raisins the potassium concentration but activity ratio is decreased. 3. The activating effect of ascorbic acid on the ATPase activity, with a given concentration of potassium in the medium, is increased by raising the sodium concentration but activity ratio is decreased. 4. The action of ascorbic acid on the ATPase activity is stimulated by calcium ions and activity ratio is increased by raising the calcium concentration. 5. The activating effect of ascorbic acid on the ATPase activity was not related to the sulfhydryl group of cysteine or the hydroxyl group of threonine. 6. The activating effect of ascorbic acid on the ATPase activity is due to amino group and carboxyl group of the enzyme of NaK ATPase.

• 한국추진공학회지
• /
• 제22권3호
• /
• pp.8-13
• /
• 2018

ZPP(Zirconium Potassium Perchlorate)는 산화제 potassium perchlorate, 금속원료 zirconium, 결합제 Viton 조성의 점화제이다. ZPP는 항공우주산업, 추진제 점화원, 자동화 산업에 사용되고 있다. 본 연구에서는 PMD(Pyrotechnic Mechanical Device)에 사용되는 ZPP의 제조공정 및 형상/열량/압력값과 같은 특성을 연구하였다. ZPP 제작 시, 원료들을 고속으로 교반하여 ZPP가 균일한 입자크기 및 형상으로 제작될 수 있도록 혼화공정을 설계하였다.

• 동아시아식생활학회지
• /
• 제24권1호
• /
• pp.42-52
• /
• 2014

The aim of this investigation was to assess the relationship between food habits and nutrient intake in college female students. Nutrient intakes of 149 female subjects aged 19.3 y were determined by using 24-hr recall. The questionnaire included general characteristics and food habits (frequency of breakfast and fast food intake). Body composition was determined by bioim- pedance analysis. Nutrient analysis was performed with Can pro software. Statistics were generated using SAS 9.3 (SAS Institute, Cary, NC). Mean intake of energy, fiber, calcium, potassium. vitamin $B_2$ and vitamin C by the subjects ware below KDRIs. The nutrients for which the largest proportion of subjects showed inadequate intakes (less than the RI or AI) were potassium, calcium, vitamin C and fiber. Subjects that consumed fast food ${\leq}6$ times showed significantly lower intakes of calcium, potassium, fiber, vitamin A, vitamin $B_6$ and vitamin C. Subjects who skipped breakfast more frequently showed significantly lower intakes of energy, carbohydrate, fiber, calcium, iron, potassium, vitamin $B_2$ and vitamin C than subjects who ate breakfast more frequently. This is strong evidence that higher intakes of nutrients such as potassium, fiber, and calcium are associated with increased frequency of eating breakfast or decreased frequency of eating fast food. Low calcium, fiber, and potassium intakes may thus lead to chronic diseases. Nutrition education can be an important facilitator for improving nutrient intakes.

• 한국토양비료학회지
• /
• 제29권1호
• /
• pp.15-19
• /
• 1996

유수형성기(幼穗形成期) 전에 한발피해를 입은 벼에 대한 피해경감을 위하여 질소와 카리비료 시용과 관수(灌水) 처리로 벼 수량에 미치는 영향을 시험한 결과는 다음과 같다. 1. 벼의 수량(收量)은 정상구에 비해 질소 30~60 kg/ha시용구는 90~95%. 카리 시용구는 87% 수준이었으며, 대조구는 정상구 수량의 86% 수준이었다. 관수(灌水)만한 대조구에 비해 한발피해를 입은 무비무관수(無肥無灌水)의 수량(收量)은 34%에 불과하였다. 2. 한발피해시 대조구에 비해 관수(灌水)와 동시 질소 30~60 kg/ha 시용으로 각각 수량(收量) 이 5. 10% 증수(增收)되었고, 질소 60kg/ha처리구는 5% 수준에서 유의성이 인정되었다. 출수기(出穗期)는 정상구에 비해 질소 시용구가 3일(日), 카리 시용구가 4일(日), 대조구가 8일(日) 정도 늦었다. 3. 한발피해를 입은 벼의 수량 확보를 위한 방법으로 관수(灌水)를 하는 것이 효과가 컸으며, 카리시용보다 질소시용이 효과가 있었다.

• BMB Reports
• /
• 제29권2호
• /
• pp.151-155
• /
• 1996

To swimming motor neurons (SMNs) of Polyorchis penicillatus, a hydrozoan medusae, dopamine (DA) acts as an inhibitory neurotransmitter by hyperpolarizing its membrane potential and decreasing its firing rate as well. Such an inhibitory action of DA is caused by an increased permeability to potassium (K) ions. To investigate whether voltage-gated K channels are directly responsible for the membrane hyperpolarization induced by DA, we employed whole-cell voltage clamp configuration. One ${\mu}M$ DA applied to SMNs increased the peak and rear values of voltage-gated K currents by 37 and 54%, respectively, in a reversible manner. Combined with subtraction analysis, this result suggests that the outflux of K ions by DA in SMNs occurs mainly through rectifier-like K channels.

• Progress in Superconductivity
• /
• 제12권1호
• /
• pp.32-35
• /
• 2010

Potassium doped $BaFe_2As_2$ superconducting thin films by using an ex situ pulsed laser deposition technique were fabricated in various conditions to find out an optimal growth condition. Controlled conditions were annealing temperature, annealing time, and mass of potassium. The $Ba_{1-x}K_xFe_2As_2$ thin films which has most good quality is fabricated at a condition of annealing temperature at $700^{\circ}C$, annealing time of 60 minutes, and 0.6 g of potassium lumps. In this condition we were able to fabricate good quality films with high transition temperature of ~ 39 K.