Nitrate regulators

Rabin, R.S. Stewart, V. Either of two functionally redundant sensor proteins, NarX and NarQ, is sufficient for nitrate regulation in Escherichia coli K-12. Proc. Natl. Acad. Sci. USA, 89, 8419-8423 (1992)... 

Crawford, N.M., Campbell, W.H. Davis, R.W. (1986). Nitrate reductase from squash cDNA cloning and nitrate regulation. Proceedings of the National Academy of Sciences (USA) 83, 8073-6. 

The advantage of this process is that it produces chlorine but no caustic soda. The demand for sodium nitrate regulates the amount of chlorine that can be made in this way. 

In addition to the substrate, nitrate, regulating the production of nitrate reductase, it has been reported that in some instances the product nitrite can stimulate the appearance of nitrate reductase (Ingle et al., 1966 Kaplan cr al., 1978). The aromatic nitro compound, chloramphenicol, and other organic nitro compounds have been shown to regulate the level of nitrate reductase in rice seedling (Shen, 1972a,b). Not only is the level of nitrate reductase influenced by these compounds but the nucleotide specificity is changed in favor of NADPH. 

This secondary reaction starts at about 180°C, but the mass must be heated to 350—400°C to bring the reaction to completion and produce a nitrate-free product. The off-gases are extremely corrosive and poisonous, and considerable attention and expense is required for equipment maintenance and caustic-wash absorption towers. Treatment of the alkaline wash Hquor for removal of mercury is required both for economic reasons and to comply with governmental regulations pertaining to mercury ia plant effluents. 

Many silver compounds are unstable to light, and are thus shipped ia brown glass or opaque plastic bottles. Silver compounds that are oxidants, eg, silver nitrate and iodate, must be so identified according to U.S. Department of Transportation (DOT) regulations. Compounds such as silver cyanide, which is toxic owiag to its cyanide content, must carry a poison label. However, most silver compounds are essentially nontoxic. 

Health and Safety Factors. The strontium ion has a low order of toxicity, and strontium compounds are remarkably free of toxic hazards. Chemically, strontium is similar to calcium, and strontium salts, like calcium salts, are not easily absorbed by the intestinal tract. Strontium carbonate has no commonly recognized hazardous properties. Strontium nitrate is regulated as an oxidizer that promotes rapid burning of combustible materials, and it should not be stored in areas of potential fire hazards. 

SI 1996/888 Protection of Water Against Agncultural Nitrate Pollution (England and Wales) Regulations... 

SI 1996/2971 Control of Pollution (Applications, Appeals and Registers) Regulations SI 1996/3001 Surface Waters (Abstraction for Drinking Water) (Classification) Regulations SI 1996/3105 The Nitrate Sensitive Areas (Amendment) Regulations... 

SI 1998/2138 Nitrate Sensitive Areas (Amendments) (No. 2) Regulations SI 1998/2746 The Groundwater Regulations... 

The plant disposes of two waste streams gaseous and aqueous. The gaseous emission results from the ammonia and the artunonium nitrate plants. It is fed to an incinerator prior to atmospheric disposal. In the incinerator, ammonia is converted into NOj,. Ehie to more stringent NO regulations, the conqmsition of ammonia in the feed to the incinerator has to be reduced from 0.57 wt% to 0.07 wt%. The lean streams presented in Table 9.5 may be employed to remove ammonia. The main aqueous waste of the process results from the nitric acid plant. Due to its acidic content of nitric acid, it is neutralized with an aqueous ammonia solution before biotreatment. 

Cellulose nitrate Air drying Solvent evaporation Blends of esters, alcohols and aromatic hydrocarbons Fairly good Bad Good Poor Very good Fire hazard Statutory regulations governing use... 

The action is rapid, and the acidity of the electrolyte is unaffected. The error due to nitrous acid is increased by the presence of a large amount of iron iron is reduced by the current to the iron(II) state, whereupon the nitric acid is reduced. This error may be minimised by the proper regulation of the pH and by the addition of ammonium nitrate instead of nitric acid, or, best, by the removal of the iron prior to the electrolysis, or by complexation with phosphate or fluoride. 

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