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.

Interaction of heat, glucose, L-alanine, and potassium nitrate in spore germination of Bacillus megaterium.

Abstract: Spores of Bacillus megateriumn germinate in the presence of glucose or L-alanine and such germination is stimulated when spores are heated before incubation with these substrates (Hills, 1950; Powell, 1951; Levinson and Sevag, 1953; Church, Halvorson, and Halvorson, 1954). Furthermore, the addition of small amounts of L-alanine increases the germination rate of spores in glucose (Levinson and Hyatt, 1955). The present report is concerned with previously unpublished details of the influence of varying combinations and concentrations of glucose and L-alanine on the extent and rate of germination, and on the modification of these spore germination requirements by heat. The addition of KNO3 to spores in L-alanine or glucose also stimulates initial germination rate, and in some cases increases total germination. Only heated spores germinate in KNO3 by itself. Glucose supports postgerminative development of spores, but L-alanine does not. However, spores germinated in L-alanine are viable, and capable of subsequent growth, if glucose is added.

Modification of potassium nitrate assimilation test for identification of clinically important yeasts.

Abstract: The modification of an auxanographic method used in yeast species identification to determine potassium nitrate (KNO3) assimilation resulted in a simple and inexpensive KNO3 assimilation test medium. The medium provided accurate and reliable results in less than 24 h.

Production of moderately halophilic amylase by newly isolated Micrococcus sp. 4 from a salt‐pan

Abstract: A new moderately halophilic Micrococcus sp. 4, isolated from salt-pan water from India, produced extracellular amylase when cultivated aerobically in medium containing wheat bran, peptone, beef extract and sodium chloride. Other salts, such as sodium nitrate, potassium nitrate and sodium sulphate, were also found to be suitable for growth and enzyme production. Maximum amylase activity (1.2 IU ml-1) was secreted in the presence of 1 mol 1-1 sodium chloride. The enzyme requires the presence of either sodium chloride, potassium chloride, sodium nitrate, sodium citrate or sodium acetate for its activity. Maximum activity was found in the presence of 1 mol 1-1 sodium chloride. The pH and temperature optima for enzyme activity were 7.5 and 50°C, respectively.

Nitrogen strengthening of interstitial-free steel by nitriding in potassium nitrate salt bath

Abstract: Nitriding of interstitial-free steel in the potassium nitrate salt bath at 592 or 650 ◦ C has been studied by using hardness and tensile testing. Pronounced nitrogen solid-solution-strengthening of the steel has been achieved. After nitriding at 592 ◦ C for 27 h, a fully recrystallized specimen shows a tensile strength of 1066 MPa, which is increased by 263% compared to that of non-nitrided steel, and the hardness increases by up to 443% accompanied by a decrease in ductility. The salt can be decomposed to generate nitrogen, NO, and NO2 gases, which are thought to give rise to nitriding of the steel samples. © 2006 Elsevier B.V. All rights reserved.