Nitrogen measurements

Pore Volume is the open space in the FCC catalyst, generally measured by mercury, nitrogen, or water. Mercury is used to measure large pores, nitrogen measures small pores, and water is used for both. 

The feasibility of the fast neutron bulk activation detection system and of other bulk nitrogen measurement systems is in serious question. The nitrogen present in innocent, common, and completely legitimate materials to be found in suitcases varies sufficiently that the estimated minimum detectable amount of explosive in this system is around 25 to 50 sticks of 40% dyji3=... 

The volume of blood in the body of a certain deep-sea diver is about 6.00 L. Blood cells make up about 55% of the blood volume, and the remaining 45% is the aqueous solution called plasma. What is the maximum volume of nitrogen measured at 1.00 atm and 37°C that could dissolve in the diver s blood plasma at a depth of 93 m, where the pressure is... 

C. Hoffmann, E. Ladewig, N. Claassen, and A. Jungk, Pho.sphorus uptake of maize as effected by ammonium or nitrate nitrogen measurements and model calculations, Zeitschrift Pflanzenernahr Bodenkunde 757 225 (1994). 

The quantity of protein present is normally measured by the Kjeldahl method. As wheat endosperm protein is around 17.5% nitrogen a factor of 5.7 is normally used to convert Kjeldahl nitrogen measurements into protein. Tkachuk suggested that 5.7 should be used for whole wheat but 5.6 should be used for flour.24... 

BM bone marrow bowel movement BMT bone marrow transplantation BOO bladder outlet obstruction BP blood pressure BPH benign prostatic h5rpCTtrophy bpm beats p minute BSA body surface area BUN blood urea nitrogen (measure of hydration and kidney function) BW body weight C constipation Ca/Ca calcium CA cancCT... 

Bradshaw, J., S. Sandholm, and R. Talbot, An Update on Reactive Odd-Nitrogen Measurements Made during Recent NASA Global Tropospheric Experiment Programs, J. Geophys. Res., 103, 19129-19148(1998). 

Among common forms of nitrogen, only azide (N3) and hydrazines (RNHNH2) are not quantitatively converted into NO by this combustion method. Bound nitrogen measurements are required for compliance with wastewater discharge regulations. 

Figure 12. Difference of chemical conformations of ephedrine (5) and pseudoephedrine ( ) and distance between hydrogen and nitrogen measured by molecular modeling (Sybyl 6.5, Tripos).

Joergensen, R. G. and Brookes, P. C. (1990). Ninhydrin-reactive nitrogen measurements of microbial biomass in 0.5 M K2S04 soil extracts. Soil Biol. Biochem. 22, 1023-1027. 

The a,-method has been used by a number of investigators to study the various stages of micropore filling (Femandez-Colinas et ah, 1989 Carrott et ah, 1989 Kenny etal., 1993 Kaneko, 1996). For example, high-resolution nitrogen measurements have... 

The first measurements of the nitrogen NMR spectra of nitrido clusters were reported for [Co6N(CO)i6] and [Rh6N(CO)xs] and posed somewhat of an enigma (3). ITie chemical shifts were 196.2 and 107.6 ppm, respectively (downfield from NH3), which were far upheld from the anticipated position based on the related carbido clusters. As a hrst approximation, the chemical shifts for nitrogen (measured relative to are twice the values for carbon (measured relative to CH4) for isoelectronic molecules (61). This relationship arises from the comparison... 

Finally, precise estimations of meridional transports provide powerful constraints of the basin scale nitrogen budgets. To provide better constraints, we require zonal sections including appropriately dense observations of the organic forms of dissolved nitrogen (measured at higher precision than now possible) to be used in quantification of the meridional transport of nitrogen. 

Lee, W., and Westerhoff, P. (2005). Dissolved organic nitrogen measurements using dialysis pretreatment. Environ. Sci. Technol. 39, 879—884. 

Respiratory measurements alone can be used to determine the amounts of carbohydrate and fat oxidized in the body over a given period. These amounts can be more accurately determirted by including data from urinary nitrogen measurements in the calculations. According to Frajm (19S3), the grams of carbohydrate (c) and fat y) oxidized per minute can be calculated from the formulas... 

TCA-soluble Nitrogen. Measured in 0.8 N trichloroacetic acid (TCA) using the method of Becker et al. (9). 

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