Bacteria, elemental composition

The degradation of 2,6-xylenol (2,6-dimethylphenol) by bacteria produces a metabolite with elemental composition C8///0O2 as determined by high-resolution mass spectrometry Which carbon skeleton and which relative configuration are deducible from the NMR experiments 44, all obtained from one 1.5 mg sample ... 

Nutritional Requirements It is important to be able to cultivate bacteria under laboratory conditions to study their characteristics. To be able to do this, one must know what food material and physical conditions are required. Bacterial cells that are actively growing are about 90 percent water. The elemental composition of bacteria is listed in Table 5.2. The nutritional medium to cultivate bacteria should contain those basic components listed. 

As an average, the composition CHj 8O0 5N025 often suffices. The average elemental composition of bacteria is different from that of yeasts or fungi, of which the approximate compositions are listed in Table 8.3 ... 

Hunt, A. P., J. D. Parry, and J. Hamilton-Taylor. 2000. Further evidence of elemental composition as an indicator of the bioavailability of humic substances to bacteria. Limnology and Oceanography 45 237—241. 

The average biomass used to represent many yeasts and bacteria has an elemental composition, on a C-moIe basis, of CH. sOo.5No.2. Compute its generalized degree of reduction, and estimate its Gibbs energy and heat of combustion. 

When the bacterium Zymomonas mobilis is used to produce ethanol from glucose in an anaerobic process with ammonia as the nitrogen source, it is found that bacteria biomass is produced to the extent of 0.06 C-moles per C-mole of glucose. The biomass has an elemental composition of CHi.sObjNo. . What are the fractional conversion of glucose to ethanol (on a C-mole basis), the amount of ammonia used, and the amount of carbon dioxide produced per C-moIe of glucose consumed ... 

Two kinds of soft hydrogel contact lenses were cleaned with different lens care solutions (ECS) and analyzed by XPS. The elemental composition did not vary strongly between the different systems but the 0=C/0—C concentration ratio varied by a factor of 5. It was inversely correlated with the initial deposition rate measured in adhesion tests of P. aeruginosa performed in a laminar flow chamber. This revealed the adverse effect of compounds rich in O-C moieties adsorbed from the LCS. " After the contact lenses were worn, the presence of nitrogen-rich compounds and a much higher O /O—C concentration ratio were observed. The initial deposition rate of bacteria was lower on worn than on unworn contact lenses. ... 

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