Nitrogen content, relationship with

A nitrogen content of about 5.7% N can be attained after 1 hr on treating 5 parts of cellulose with 60 parts of dinitrogen tetroxide dissolved in 60 parts of carbon tetrachloride, mixed with 7 parts of anhydrous nitric acid. The relationship between the nitration time under the conditions mentioned above and the variation of nitrogen content of the product is shown in Fig. 128. 

The relationship between pH, mineral retention, and basic cheese structure has been illustrated by Lawrence et aL (1984). Hill et al. (1985) have developed mathematical models of the association between pH at draining and mineral content of whey. The calcium, phosphorus, magnesium, and nonprotein nitrogen content of whey increased with decreasing pH, while sodium and potassium levels were not affected. Mineral and nonprotein nitrogen concentrations in the whey were not associated with cooking temperature. 

Figure 11. Relationship of carbon-to-nitrogen content of chitin subjected to alkaline hydrolysis for varying lengths of time, v, idealized chitin (0% deacetylation, N-aeetyl-D-glucosamine, M.W. = 203) a, idealized chitosan (100 deacetylation, glucosamine, M.W. = 161). (Reproduced with permission from Ref. 12 Copyright 1984, Academic Press.)...

It Is of Interest to note that for both epoxies the differential area appears to Increase steadily with the molar ratio of moisture to nitrogen content. Since each of the epoxies contain varying amounts of primary, secondary, and tertiary amines, the fact that both epoxy systems do not fall on the same line Is expected. Sulfone groups In the N-5208 system further complicate analysis of the hypothesized relationship. 

When 1.5 volumes acetone is added to the trichloroacetic acid filtrate of the gastric juice, an abundant flocculent precipitate forms, which contains all the components of dissolved mucin with the exception of soluble mucus. If this precipitate is taken up in dilute alkali and then acidified with dilute HCl down to pH 3.5, a fine flocculent precipitate forms, which we named dissolved mucoprotein (G27, G36). It was later renamed glandular mucoprotein (G9, G38) because of its close relationship to the fundic glands of the stomach. This material contained much protein its nitrogen content was 12.61 0.44% and its tyrosine content 7.50 0.65% by the Folin-Giocalteu reaction. The reducing substance content was 6.38 1.48% before and 12.5% after hydrolysis (G9, G27, G36) (see Table 4). Werner (W9) determined the composition of this mucoprotein fraction and found that it contained 11.2% N by Kjeldahl, 8.8% hexosamine, 4.8% uronic acid, and 2.0% sialic acid. 

The activation energy of the pyrolysis reaction shows a linear relationship with analytical data such as the nitrogen and sulfur contents, whereas no correlation could be found with the average molecular weight, the colloid composition, or the H/C ratio (Table 4-141). 

This study was undertaken to determine the relationships between the rapid growth of vegetation after fire and the seasonal variations of some physiological factors in resprouts compared with unburnt material. Seasonal photosynthesis and transpiration measurements as well as leaf nitrogen content were conducted during the first post-fire year. 

Pseudoaikaioids a group of alkaloids earlier assigned to other groups (e. g. some were grouped with the terpenes) with which they show a close structural relationship. At the time, their nitrogen content seemed incidental. 

The close relationships of larval growth rates and efficiencies (see Fig. 7.1 Waldbauer, 1968) with leaf nitrogen content is illustrated in Fig. 7.2. The symbols represent the mean performance ( SE) of the black swallowtail butterfly, Papiliopolyxenes, larvae for 11 different species of the Umbelliferae family at particular times of the growing season. The poor correspondence of plant N... 

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