In general, the biologically available forms (Phosphate extracted by anion-exchange membranes, NaHCO3-Pi, and NaHCO3-Po) were found to be very low (less than 2%).
Biologically inactive derivatives of several vitamins have been found, however, and may interfere with such determinations; in addition, these procedures also may not distinguish between bound (i.e., unavailable) and available forms of a vitamin in a food.
Therefore, plant growth could be affected due to the presence of low biologically available P forms and this indicates management of P is a must for a better production.
In recent years, lanthanum modified bentonite has been increasingly applied to eutrophic lakes with the aim of converting potentially bio-available forms of phosphorus in sediments into biologically unavailable forms.
Assessment of biologically available fractions of heavy metals helps to evaluate their potential for mobilization and availability to benthic organisms (Rodrigues et al. [2010]).
Because they contain biologically available carbon (in the form of lipids) and water, water-based metalworking fluids routinely sustain microbial growth, but excess growth degrades the fluids and leads to loss of usefulness.
Plasma intact GLP-1 was measured by radioimmunoassay using a commercially available kit (GLP1A-35HK; Millipore, Billerica, MA), which allows quantification of biologically active forms of GLP-1 (i.e., 7-36 andde and 7-37) in plasma and other biological media.
The results demonstrate the importance of controlling the concentration of biologically available organic carbon in a recirculating aquaculture system.
Fossil fuel combustion, fertilizer production and use, cultivation of legume crops, and deforestation create and mobilize reactive nitrogen, oxidized and reduced nitrogen forms that are largely biologically available (Galloway et al. 2004).
The most plentiful source of biologically available magnesium, however, is the hydrosphere (i.e. oceans and rivers).
