Limiting factors definition

Adsorption kinetics involve a time-dependent process that describes the rate of adsorption of chemical contaminants on the solid phase. The standard chemical meaning of kinetics usually covers the study of the rate of reactions and molecular processes when transport is not a limiting factor however, this definition is not... 

Health can be difficult to define and measure the WHO (World Health Organization) describes it as a state of physical, mental and social well-being. In the past it may have been viewed merely as freedom from disease or injury but this is too limited a definition for modem society. In fact lifestyle factors and our changing environment have given rise to new forms of... 

Without the results from our second study, a definitive conclusicai is not easy. If results of our 1st study are applicable to a range of dietary zinc intakes, a phytate to zinc molar ratio of 10 to 12 is not a hinderance to bioutilization of zinc by humans and the level of intake of zinc becomes a limiting factor in determining adequacy. We know from our analysis of self-chosen diets, and estimation by others, that most people consume diets that are less than 10 in phytate/zinc molar ratio. Vegetarians, particularly those who eat a lot of cereal products, will very likely exceed the value of 10. There is wide variation between individuals and from day to day by each individual. The role of adaptation or response of homestatic control mechanisms require further clarification but it is our feeling at present that humans can consume a wider molar ratio of phytate to zinc than heretofore thought. 

The use of existing manufacturing facilities also overcomes another common limiting factor in product development the availability of product for test purposes and clinical trials. All critical tests must be done with a product which is essentially the same as the final product, if the data from these tests are to be used for the registration application. Research material of dubious quality is definitely not appropriate. 

Further studies in Iran clearly demonstrated that zinc is a principal limiting factor in the nutrition of children (18). It was also evident from several studies conducted in the Middle East that the requirement of zinc under different dietary conditions varied widely. For instance, in the studies reported by Prasad et al. (5,7) and Sandstead et al. (19), 18 mg of supplemental zinc with adequate animal protein and calories diet was suflBcient to produce a definite response with respect to growth and gonads, but in other studies when the subjects continued to eat village diet, up to 40 mg of zinc supplement was required to show some growth effect (IS). 

Activation, definition, 53,55 Activation function, definition, 55 Aeration basin design performance limiting factor, example ofPOTW EXPERT S use, 137-138... 

Although the transformation of ammonium carbamate to urea is not a direct dehydration, the presence of water is, however, a limiting factor with respect to the extent that the reaction occurs. It has been found that at any temperature a definite equilibrium is established that can be approached from either direction. Krase and Gaddy have shown that a real shift in the carbamate-urea-water equilibrium is obtained by employing an excess of anhydrous ammonia, which functions as a strong dehydration agcnt. The employment of ammonia, up to 280 per cent of that combined as carbamate, gives conversions to urea between 81 and 85 per cent of the carbamate ammonia. These results are shown in the curve of Fig. 8-8. 

Water Utilization Efficiency Water will quite definitely be a decisive limiting factor in the worldwide expansion of agriculture (9,54,57,58). It is therefore important that water utilization efficiency be considered in the future screening and development of herbaceous land plants as energy resources. Three factors must be assessed from the onset (a) Utilization efficiency in photosynthetic processes (b) water extracting capability from the candidate species natural terrain and (c), the specibs capacity for water conservation by anatomical means. 

Relation of such empirical calibration to quantitative spectroscopic theory was pursued with two of the different source lamps by determining their spectral distributions from high resolution spectro-graphic plates made by repeated flashes, combined with numerical evaluation of Tji via equation (2.3) using the band transition probability factor or /-number, and the pressure broadening factor, as well as the absorber temperature, as selectable parameters. Uncertainty concerning the presence of continuum radiation between the OH lines in the source spectrum ultimately limited the definiteness of this calibration procedure. 

When trying to identify performance-limiting factors in PEC photoelectrodes, the quantum efficiency as a function of wavelength is a particularly useful parameter. The definition of the external quantum efficiency is the fraction of the incident photons that is converted to electrons that can be measured by the outer circuit. This is the IPCE incident photon-to-current conversion efficiency), which is given by... 

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