Constitutive NOS

CatalyticaHy Active Species. The most common catalyticaHy active materials are metals, metal oxides, and metal sulfides. OccasionaHy, these are used in pure form examples are Raney nickel, used for fat hydrogenation, and y-Al O, used for ethanol dehydration. More often the catalyticaHy active component is highly dispersed on the surface of a support and may constitute no more than about 1% of the total catalyst. The main reason for dispersing the catalytic species is the expense. The expensive material must be accessible to reactants, and this requires that most of the catalytic material be present at a surface. This is possible only if the material is dispersed as minute particles, as smaH as 1 nm in diameter and even less. It is not practical to use minute... 

It is sometimes said that this electrode is reversible with respect to the anion. This claim must be examined in more detail. An electrode potential that depends on anion activity still constitutes no evidence that the anions are direct reactants. Two reaction mechanisms are possible at this electrode, a direct transfer of chloride ions across the interface in accordance with Eq. (3.34) or the combination of the electrode reaction... 

The ability of micro-organisms to produce pectic enzymes in vitro constitutes no proof of their pathogenicity. Some micro-organisms produce pectic enzymes on synthetic-nutrient media, but do not always possess the ability to produce them in vivo. An important role is here played by the susceptibility or resistance of the plant to the effect of the pathogen. Production of D-galacturonanase and pectines-terase by Fusarium oxysporum f. lycopersici was found to be much higher on susceptible than on resistant tomato-stems.287 Likewise,... 

Pigment Red 177, a red pigment which is listed in the Colour Index under Constitution No. 65300, has the chemical structure of 4,4 -diamino-1,1 -dianthra-quinonyl (84) [6] ... 

The most important route to 1-acylaminoanthraquinones involves reaction of 1-aminoanthraquinone with acid chlorides in an organic solvent. Reaction of 1-aminoanthraquinone with benzoylchloride in nitrobenzene at 100 to 150°C affords 1-benzoylaminoanthraquinone, a yellow pigment which is registered as Colour Index Constitution No. 60515. The reaction may also be performed in the presence of a tertiary amine, which acts as a proton acceptor ... 

P.R.83, listed under Constitution No. 58000 1, continues to be used only in the USA. The pigment affords brilliant, bluish shades of red. Traces of iron as an impurity adversely affect the full shades and shift the color towards duller and bluer shades. The pigment is not fast to common organic solvents, especially to esters and ketones. It therefore lacks stability to overcoating. Its lightfastness, particularly in tint, is poor. P.R.83 is used in paints for toys, in packaging printing inks, especially for soap and butter, and in artists colors. 

Commercial interest inP.V.5 l, Constitution No. 58055 1,has declined considerably. The pigment continues to be used in industrial paints, especially throughout the USA. Its full shade is a brilliant, deep bluish maroon. In white reductions, the pigment produces clean, reddish violet shades. It lacks tinctorial strength and the coatings are fast to neither acid nor alkali. P.V.5 1 is also not very lightfast, which practically precludes its use in products for exterior application, particularly in reduced shades. 

Flavanthrone Yellow, together with its chemical structure, is listed in the Colour Index under Constitution No. 70600. It was temporarily known as Pigment Yellow 112, but now it is exclusively referred to as Pigment Yellow 24. Since some time sales products of P.Y.24 are not listed anymore in the catalogues of the manufacturers, but the grades are still available on the market. 

P.O.67 is a member of the pyrazolo-quinazolone pigment series. Its constitution is listed in the Colour Index under Constitution No. 12915. Coupling component is the heterocycle shown on p. 503. The diazonium component is 2-nitro-4-chloroani-line. Coupling affords the pigment, which was found to exhibit the hydrazone structure ... 

Presolar stardust discovered to date in meteorites constitute no more than 0.5%o of the total mass of the samples, and one common chemical property is that they are acid resistant. Isotopic heterogeneity could also be present in less refractory phases like silicates, provided parent body metamorphism did not erase the differences. Noble gases are not discussed here because they are depleted by many orders of magnitude relative to the Sun and can be dominated by trace exotic minerals. Nitrogen is not discussed for the same reason. The... 

Every year 10% of the American chemists spend 40 hours in conference rooms and use 19 pounds of paper. Even if this statement is not a truthful one, it expresses one of the well established forms of scientific statements, namely a statistical one. We are quite used to dealing with statistics, the collection and analysis of data and the drawing of conclusions from this data ( 2. ) In a scientific way, this mode constitutes no problem. On the other hand compare these two statements Get a shot against the flu because only very few of the inoculated people will get the flu, versus Get a shot against the flu, because only 3% of the inoculated people will get the flu . The second statement provides more precise information than the first. 

Menopause The age of the patient constitutes no absolute limiting factor, although treatment with progestins may mask the onset of the climacteric. 

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