Topic
Potassium nitrate
About: Potassium nitrate is a research topic. Over the lifetime, 3537 publications have been published within this topic receiving 29450 citations. The topic is also known as: Nitric acid, potassium salt & Saltpeter.
Papers published on a yearly basis
Papers
More filters
TL;DR: The levels of the NADP-specific malic enzyme in Fusarium oxysporum are controlled by both the carbon and nitrogen sources in which the cells are grown.
Abstract: The levels of the NADP-specific malic enzyme in Fusarium oxysporum are controlled by both the carbon and nitrogen sources in which the cells are grown. The enzyme is not induced by malate; maximum activity is obtained when the mycelium is grown on sucrose or ethanol. With ammonium sulfate as the nitrogen source, one enzyme-activity peak is obtained by 40 h, while in the presence of potassium nitrate this peak is repressed, with a peak appearing at a later stage of growth. In ammonium nitrate, two enzyme-activity peaks are present, one corresponding to the peak present in ammonium sulfate and the other to the peak present in potassium nitrate grown cells.When the initial velocities are plotted against increasing malate concentration non-Michaelis–Menton kinetics are obtained. The double-reciprocal plots are biphasic and Rs values of 161 are obtained. Hill plots prepared from initial velocity data show that at low malate concentration, the slope of the line is 0.87, and it decreases to 0.45 at 1.32 × 10−3 M...
15 citations
TL;DR: In this article, mutants deficient in the high affinity system of nitrate uptake was screened using mutagenized M 2 population of rice (Oryza saliva, cv. Nipponbare or Kinmaze).
Abstract: Screening for mutants deficient in the high affinity system of nitrate uptake was performed using mutagenized M 2 population of rice (Oryza saliva, cv. Nipponbare or Kinmaze). For selecting mutants, M 2 seedlings were transferred individually to 10 ml solution containing 250 μM potassium nitrate and 500 μM calcium sulphate at 20 or 28°C. After 6 or 24 h, nitrate concentration of the solution was determined with a nitrate selective electrode and the seedlings showing impaired nitrate uptake were selected as nitrate uptake deficient variants. Of 74 variants, three were confirmed to be mutants with low nitrate uptake ability in the M 3 generation. Potassium uptake ability also decreased in the mutants. Three mutants were divided into two groups based on the analysis of nitrate reductase (NR, EC 1.6.6.1) activity and chlorate resistance. Two, NUE13 and NUE36, had a lower level of NR activity than the original cultivar and were not resistant to chlorate, while the seedlings of NUESO had the same level of NR activity as the original cultivar and were more resistant to chlorate than the original cultivar. All mutants were resistant to cesium, a toxic ion analogue for potassium, suggesting that the decreased levels of both nitrate and potassium uptake were coupled to the change of plasma membrane H + -ATPase activity.
15 citations
Journal Article•
TL;DR: A microalgae isolate obtained from a wastewater swamp in Zifta, Gharbia Governorate, Egypt identified as Chlorella sp. M2 was examined for biomass and lipid production in Bold Basal Medium (BBM) containing different concentrations of some nitrogen sources (urea, ammonium carbonate, potassium nitrate and ammonium nitrate, and sodium nitrate) as discussed by the authors.
Abstract: A microalgae isolate obtained from a wastewater swamp in Zifta, Gharbia Governorate, Egypt identified as Chlorella sp. M2 was examined for biomass and lipid production in Bold Basal Medium (BBM) containing different concentrations of some nitrogen sources (urea, ammonium carbonate, potassium nitrate, ammonium nitrate, and sodium nitrate). Chlorella sp. M2 was able to utilize all examined sources of nitrogen at concentrations ranged from half to 16 folds higher than the recommended amount of N applied in BBM. Results obtained indicated that urea is the most appropriate nitrogen source for Chlorella sp. M2 growth biomass and lipid quantity and quality beside it is the cheapest substrate among the investigated nitrogen sources. The analysis of lipid produced by Chlorella sp. cultivated with urea as nitrogen source exhibited high percentage of C16 and C18 fatty acids with high percentage of unsaturated fatty acids specially oleic acid which considered as ideal fatty acid for biodiesel production.
15 citations
Patent•
20 Jan 2010
TL;DR: In this paper, a double decomposition reaction was employed for the preparation of ammonium nitrate and ammonium chloride in the form of feed liquid circular reaction (FLR) to achieve supersaturation state.
Abstract: A method for preparing potassium nitrate and ammonium chloride employing double decomposition reaction comprises the following steps: dissolving ammonium nitrate and potassium chloride in water according to a defined ratio at 110 DEG C, continuously adding potassium chloride and water, heating while stirring to ensure that potassium nitrate is in supersaturation state, after stopping heating, cooling the solution in a vacuum cooling crystallizer to 36-40 DEG C to separate potassium nitrate crystal, placing the potassium nitrate crystal in a centrifugal machine with a filter cloth lining to obtain coarse potassium nitrate, then washing the potassium nitrate with cold water, drying to obtain the finished potassium nitrate; in addition, adding ammonium nitrate in mother solution I and cleaning solution to adjust solution concentration so that ammonium chloride can reach supersaturation state, using a vacuum concentration device to perform negative pressure evaporation, separating and precipitating ammonium chloride by centrifuging and obtaining a solid ammonium chloride product, wherein, when dissolving ammonium nitrate and potassium chloride, the ratio of ammonium ion to chlorine ion is 1:2 and when using the centrifugal machine to obtain the coarse potassium nitrate, the separated mother solution is another mother solution I sharing the same saturation point of potassium nitrate and ammonium chloride. The solution of feed liquid circular reaction overcomes the defects of the prior art that the price of potassium nitrate used in reaction is high, the resource of potassium nitrate is in short supply and the cost of devices used in ion-exchange method is high, thus being applicable to the production of potassium nitrate.
15 citations
TL;DR: In this paper, it was shown that levels in excess of 300 kg N/ha and up to 400 kg n/ha, even on a pasture with a high basal level of fertility, could be economically justified.
Abstract: On dryland Digitaria eriantha ammonium sulphate and limestone ammonium nitrate were superior to potassium nitrate and urea. With reference to the level of nitrogen fertilization it was found that levels in excess of 300 kg N/ha, and up to 400 kg N/ha, could be economically justified, even on a pasture with a high basal level of fertility.
15 citations