• Journal of the Korean Society of Tobacco Science
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• v.17 no.1
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• pp.62-67
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• 1995

Deliveries of tar, nicotine and carbon monoxide in mainstream smoke decreased with increment of exogenous potassium content of tobacco. Potassium malate was more effective than potassium nitrate, potassium carbonate, potassium citrate and potassium oxalate for the reduction of carbon monoxide, but potassium nitrate was more effective than potassium palate, potassium carbonat, potassium citrate and potassium oxalate for the reduction of carbon in the case of nicotine. Puff count and burning rate were slightly changed with added potassium salts.

• Molecules and Cells
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• v.37 no.8
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• pp.575-584
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• 2014

Potassium is a macronutrient that is crucial for healthy plant growth. Potassium availability, however, is often limited in agricultural fields and thus crop yields and quality are reduced. Therefore, improving the efficiency of potassium uptake and transport, as well as its utilization, in plants is important for agricultural sustainability. This review summarizes the current knowledge on the molecular mechanisms involved in potassium uptake and transport in plants, and the molecular response of plants to different levels of potassium availability. Based on this information, four strategies for improving potassium use efficiency in plants are proposed; 1) increased root volume, 2) increasing efficiency of potassium uptake from the soil and translocation in planta, 3) increasing mobility of potassium in soil, and 4) molecular breeding new varieties with greater potassium efficiency through marker assisted selection which will require identification and utilization of potassium associated quantitative trait loci.

• Journal of Chest Surgery
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• v.17 no.4
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• pp.587-592
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• 1984

Potassium cardioplegia for myocardial preservation is being used extensively in open heart surgery. This study was designed to investigate the change in serum and urine potassium before, during, after the administration of cold blood potassium cardioplegic solution containing 28-30 mEq/L [28.6\ulcorner.56 mEq/L] of potassium chloride in 6 dogs. Total potassium dose used in the study was 14.9\ulcorner.89 mEq/L [1.2 mEq/Kg]. Mean potassium level in serum was within normal limits. Urinary excretion of potassium decreased during bypass but increased after bypass and eventually exceeded the amount of potassium infused as cold blood potassium cardioplegic solution. While cold blood potassium cardioplegia is a safe and efficient method of myocardial protection, postoperative potassium level must be observed carefully in order to detect obligatory potassium excretion following open heart surgery.

• Applied Biological Chemistry
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• v.15 no.2
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• pp.143-162
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• 1972

Based on the concentration of $^{40}K$ naturally occurring radioisotope of potassium, a method for the determination of total potassium in soils and plants was developed. The method was extended to evaluate the potassium supplying power of soils by taking the ratio of exchangeable potassium to total potassium $(K_{ex}/K_t)$, termed the potassium buffering capacity. Using this as index, it was observed that the release of potassium from soil fellows the from order reaction. A linear relationship was found between the potassium buffering capacity and the release constant of potassium or mica content of the clay. Similarly the potassium buffering capacity was also closely correlated with total uptake of potassium by rice plant. Hence it is concluded that the method for determining of the potassium buffering capacity could be veil applied to characterize the potassium availability of soils. The method for the determination of potassium is characterized by (1) The efficient measurement of the weak beta activity emissions from the samples, (2) identification of $^{40}K$, (3) calculation of total potassium content using the proportional constant of $^{40}K$ of samples to that of the standard. Difference in the potassium supplying power of soils due to soil types was also evaluated with the use of this technique. The degree of the potassium supplying power was in the order of soil types as red-yellow podzolic and lateric soils, basaltic materials(Rvd)> low-humic gley and alluvial soils, alluvial plains and food plains(Apa)> low-humic gley soils, nearly level to sloping local alluvial plains and slopes(Afb)> low-humic gley and alluvial soils, fluvio-marine plains (Fma).

• Journal of Yeungnam Medical Science
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• v.11 no.2
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• pp.363-374
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• 1994

The purpose of this study was to investigate the characteristics or the potassium channels existing in the rat urinary bladders. Smooth muscle strips of rat detrusor urinae were examined by isometric myography. Relaxation responses of detrusor muscle strips to the three potassium channel openers pinacidil, a cyanoguanidine derivative, BRL 38227, a benzopyran derivative and RP 52891, a tertrahydrothiopyran derivative were examined. The potassium channel openers reduced the basal tone, and the rank order of potency was RP 52891>pincidil>BRL 38227. Procaine, an inhibitor of the voltage-sensitive potassium channel tended to increase the basal tone, but it did not affect the relaxant effects of the calcium-activated potassium channel opener did not antagonize the relaxant effects, but it reduced the Emax of RP 52891 and BRL 38227. Glibenclamide, an inhibitor of the ATP-sensitive potassium channel, antagonized the relaxant effects of pinacidil, RP 52891 and BRL 38227 reducing the Emax of RP 52891 and BRl 38227. Galanin which inhibits secretion of insulin through opening the ATP-sensitive potassium channels in pancreatic ${\beta}$-cells rather increased the basal tone of the isolated detrusor strips. These results suggest that the urinary bladder of the rat has mainly the ATP-sensitive, glibenclamide sensitive potassium channel, which is a different type from that in the pancreatic ${\beta}$-islet cells..

• Asian-Australasian Journal of Animal Sciences
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• v.1 no.1
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• pp.33-41
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• 1988

In a study about minerals cycling in grassland agro-ecosystem, investigation on relations among two minerals, potassium(K) and magnesium(Mg), and nitrogen(N) was performed. Four kinds of diets different in K and N levels were fed to four goats with a Latin-square method and $2{\times}2$ factorial design. As the basal diet, press cake silage prepared from Italian ryegrass was used because of its uniformity and comparatively low mineral concentrations. Supplementation of K and N were made using potassium bicarbonate and urea. In the experiment, it was clearly shown that high K concentration in the forage crops is the main reason of the low utilization of Mg in ruminant animals. However, high nitrogen intake resulted in the increase of magnesium retention, urinary potassium excretion, water intake and volume of urine and in the decreases of potassium intake minus urinary potassium excretion. The results of high nitrogen intake seemed to be produced in the following order;increase of urine, increase of water intake, increase of urinary potassium excretion, and decrease of intake minus urinary potassium excretion. The amount of potassium intake minus urinary potassium excretion had significantly close relationships with magnesium utilization and serum magnesium concentration. As a conclusion, higher nitrogen intake by ruminants seemed to be preferable for magnesium utilization through increased water intake and urinary potassium excretion, if the sufficient drinking water could be supplied to ruminants.

• Journal of Chest Surgery
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• v.11 no.3
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• pp.296-302
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• 1978

This experiment was carried out to study the change of potassium before, during, and after extracorporeal circulation. Serum potassium and urinary potassium excretion were examined in 7 cases of patient who were taken open heart surgery using extracorporeal circulation. All of 7 cases were administered 10-25mEq of KC1 during extracorporeal circulation. Serum potassium was not changed significantly during, and after operation, but urinary potassium excretion was declined during extracorporeal circulation and tend to rise after extracorporeal circulation. This result showed no remarkable relation of serum potassium and urinary potassium excretion.

• Journal of Chest Surgery
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• v.15 no.1
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• pp.35-39
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• 1982

Cold blood potassium cardioplegia, by two types of the infusion systems, was used in 45 patients who were undergone the open cardiac operation. Method A [in 25 patients] was the syringe infusion system and method B [in 20 patients] was the pump infusion system. Cold blood potassium cardioplegic solution was used less amount on method B than method A. Serum potassium was often increased significantly on method A as a result of excessive infusion of cold blood potassium cardioplegic solution. But method B, excessive infusion of cold blood potassium cardioplegic solution was prevented by reperfusion of the previous infused cold blood potassium cardioplegic solution through the recirculation system. Alteration of infused rate and concentration of potassium in cold blood potassium cardioplegic solution during infusion [which might be suggested on the method A] could be controlled on method B.

• Journal of Chest Surgery
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• v.25 no.1
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• pp.17-22
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• 1992

The alterations in serum and urine potassium were studied in twenty two patients who underwent open heart surgery using extracorporeal circulation from June 1990 to August 1990 at the Department of Thoracic and Cardiovascular Surgery, School of Medicine, Kei-myung University. There were fifteen cases congenital heart disease and seven acquired heart disease. The serum and urine potassium levels were measured pre-, intra- and postoperatively until seventh postoperative day using ionic selective electrode measuring method. After general anesthesia, the serum potassium level decreased significantly but slowly increased during.cardiopulmonary bypass and returned preoperative level after operation. The urine potassium level decreased slowly from general anesthesia to cardiopulmonary bypass weaning but returned preoperative level following operation. During cardiopulmonary bypass, serum and urine potassium levels in diuretic group were lower than that of non diuretic group. There was no remarkable difference in the serum potassium level between single RA cannulation group and bicaval cannulation group preoperatively, but the serum potassium level in single RA cannulation group was much higher than that of bicaval cannulation group. There was no significant difference in the urine potassium level between single RA can-nulation group and bicaval cannulation group postoperatively.

• Archives of Pharmacal Research
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• v.8 no.2
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• pp.49-57
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• 1985

The effect of ginseng components on the potassium depleted cardiomyopathic rat heart was investigated. In the perfused heart experiment using Langendorff apparatus, the deterioration rate of contriactile force of potassium depleted rat heart (low potassium diet group) was faster than that of normal rat heart and ginseng components showed the ability to slow the deterioration rate of potassium depleted hearts. Both sialic acid contents in carcolemmal ghost and sialyltransferase activity of 40,000 * g subcellular fraction prepared from cardiac ventricular tissue of low potassium diet group were significantly decreased compared to those of normal group. The decrease of the sialic acid content and sialyltransferase activity in sarcolemma of low potassium diet group was inhibited when ginseng was concomitantly administered. Calcium uptake of sarcoplasmic reticulum prepared from low potassium diet group was significantly greaterthan that of normal group. Ginseng extract or total saponin showed the tendency to inhibit the increase of cacium uptake.