Dependence on nitrogen

The observed rate law depends on the type of catalyst used with promoted iron catalysts a rather complex dependence on nitrogen, hydrogen, and ammonia pressures is observed, and it has been difficult to obtain any definitive form from experimental data (although note Eq. XVIII-20). A useful alternative approach... 

Other studies showed the same trends discussed earlier. Films obtained by RF-PECVD, deposited at about the same conditions in other precursor atmospheres [79], showed the same behavior, with the Id/Iq and wq following about the same dependence on nitrogen content as the one shown in Figure 23. 

TiC is thermodynamically not compatible with Si3N4 under sintering conditions. TiC reacts with Si3N4 forming TiCxN x where the x values are in the range of 0.3 [568, 569] to 0.24 [567], The x value in TiCxN x depends on nitrogen pressure and temperature. As an additional reaction product, SiC may be formed or the oxide nitride liquid phase can be reduced by carbon... 

Si3N4/W W wire in Si3N4 for heating elements Depending on nitrogen pressure and temperature WSi2 can be formed leading to a destruction of the wire [563]... 

Linear regression results for the correlation of the PAP contents of the 200° to 325° C, 325° to 425° C, and 425° to 540° C distillates with the distillate nitrogen content gave correlation coefficients of 0.85, 0.96, and 0.93, respectively, indicating very good correlations. Data for the middle distillate are plotted in Figure 4. Thus, the trend in PAP content may very well be more dependent on nitrogen content than on coal rank for these liquids. 

Nitrogen-rich phase boundary depends on nitrogen pressure. Exact composition unknown, prohahly close to 2 1 (CrNi j , MoNi j ) or 1 1 (aU others) stoichiometry. X-ray density. Decomposes. Calculated. Not superconducting. Exact composition unknown. 

Luque, L, Contreras, A., Zabulon, G., Herrero, A., and Houmard, J. (2002). Expression of the glutamyl-tRNA synthetase gene from the cyanobacterium Synechococcus sp PCC 7942 depends on nitrogen availability and the global regulator NtcA. Mol. Microbiol. 46, 1157—1167. 

The way hydrophilicity depends on nitrogen content is also very interesting, with a maximum like that for the softness response. Again we are probably encountering the superposition of two antagonistic effects, the increase in [iV] leading to more and more irreversibly adsorbed PDMS monomers and more water repellency, then above a certain threshold the increase in polarity and ionized species concentration may lead to a true hydrophilicity of the treated fabric. 

Because wheat, rice, corn, and potatoes cannot perform the same feat as legumes, these plants depend on nitrogen-fbang bacteria in the soil. Soil bacteria convert NHg into nitrate ions, NO 3, the form of nitrogen that can be absorbed and used by plants. These plants also often need nitrogen fertilizers to supplement the work of the bacteria. Besides supplying nitrogen, fertilizers are manufactured to contain phosphorus, potassium, and trace minerals. 

Laser flash photolysis techniques have been employed to evaluate the dynamics of decarboxylation reactions of cation radicals derived from a-aminocarboxylates. > In one report, variously substituted aminium radicals 47 were generated by laser flash excitation of anilinocarboxylates 46 (Scheme 21) in MeCN solutions containing the acceptor, 1,4-dicyanobenzene. These transients undergo fast, first-order decay by a pathway involving loss of carbon dioxide. The rate constants for decarboxylation were found to be in the range of 8 x 10 to 4 x 10 s . In addition, the rates show the same dependence on nitrogen, a-alkyl and a-phenyl substituents, as do the related a-CH deprotonation, a-desilylation, and retro-Aldol cleavage reactions. 

In contrast to the United States, China has little room to reduce substantially its high dependence on nitrogen fertilizer. This dependence is overwhelmingly existential— to secure basic adequate nutrition for the conntry s more than 1.2 billion people— rather than a matter of economic choice or of a preferred diet as in the U.S. case. Origins of this recent dependence are closely connected with the most tragic period of China s modern history, and their recounting provides perhaps the most compelling illustration of the epochal difference made by the Haber-Bosch synthesis. 

Increasing dependence on nitrogen fertilizers in land-scarce populous nations, 1960-1996. 

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