Upper deterioration

Weathered rock is bedrock that is deteriorating due to the weathering process. Usually this is confined to the upper layers of the bedrock. 

A less rigid pavement can be created by blending an asphalt-water-surfactant emulsion with the upper soil layers. During the curing process, the asphalt-water emulsion deteriorates, leaving the asphalt to bind the hydrocarbon contaminants and soil to create a low-permeability pavement. Asphalt-soil pavements tend to be less rigid than pozzolanic-soil structures. 

B. Status asthmaticus is a dangerous exacerbation of asthma symptoms. It requires immediate and aggressive treatment with oxygen, inhaled bronchodilators, and systemic corticosteroids. Hospitalization of the patient is often indicated. By definition, status asthmaticus is not a condition in which symptoms are well controlled. Neither cromolyn sodium nor a leukotriene modulator is indicated for the treatment of status asthmaticus, as their onset of action is too slow. Status asthmaticus often does not resolve without aggressive intervention. Indeed, the patient s condition can deteriorate rapidly to death. Upper respiratory tract infection or excessive exposure to an allergen often precedes status asthmaticus, as does increased use of inhaled bronchodilators. 

For a number of years, chlorofl uorocarbons were the most popular source of pressure for these cans. Because of concern in recent years over the reactions of chlorofluoiocarbons in the upper atmosphere of the earth that appear to be leading to a deterioration of the ozone layer, some countries have banned there use in aerosol cans. Manufacturers have turned to other gases or to conveniently operated hand pumps. See also Colloid Systems and Pollution (Air). 

The stability of enzyme electrodes is difficult to define because an enzyme can lose some of its activity. Deterioration of immobilized enzyme in the potentiometric electrodes can be seen by three changes in the response characteristics (a) with age the upper limit will decrease (e.g., from 10-2 to 10 3 moll-1), (b) the slope of the analytical (calibration) curve of potential vs. log [analyte] decrease from 59.2 mV per decade (Nernstian response) to lower value, and (c) the response time of the biosensor will become longer as the enzyme ages [59]. The overall lifetime of the biosensor depends on the frequency with which the biosensor is used and the stability depends on the type of entrapment used, the concentration of enzyme in the tissue or crude extract, the optimum conditions of enzyme, the leaching out of loosely bound cofactor from the active site, a cofactor that is needed for the enzymatic activity and the stability of the base sensor. 

There is another phenomenon, regarded as a deteriorative change in the protein of soy milk, caused also by the evaporation of water. This is a film formation on the surface of soy milk, which occurs when heated soy milk is kept open to the air. This phenomenon is observed not only in heated soy milk but also in heated cow s milk. Film formation of soy milk occurs only when the soy milk is heated above 60°C and there is evaporation of water from the surface of the soy milk. The mechanism of protein insolubilization is basically the same as that of soy milk powder produced from heated soy milk (10. When water is removed from the surface of heated soy milk by evaporation, the molecular concentration of protein near the surface increases locally and the exposed reactive groups of the denatured molecules come close enough to interact intermolecularly both by hydrophobic interactions and through the sulfhydryl/disulfide interchange reaction to form a polymerization (film) on the surface. The upper side of the film contains more hydrophobic amino acids because of orientation of the hydrophobic portions of the unfolded molecules to the atmosphere rather than into the aqueous solution. 

Unfortunately, by forming an upper bound one introduces terms depending on the square of the number of electrons and thus the quality of this upper bound deteriorates as the number of electrons is increased. This is illustrated in Table 1 for an array of well-separated nitrogen molecules. 

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