To remove all traces of nutrients from cell cultures, the contents of five tubes per strain were concentrated and washed with water (similar to [ 70]).
The seedlings were removed from solution and washed thoroughly with running tap water for 30 min and then with deionized water to remove traces of nutrients and Al ions from root surfaces.
For example, the inventory of changes in root system architecture (RSA) as a plant adaptation to nutrient stress can be influenced by the presence of traces of nutrients in different brands or even batches of agar as reported for the Pi starvation response [ 1].
Feeding relations require extensive investigations into the gut contents of organisms, which can be difficult to decipher, or stable isotopes can be used to trace the flow of nutrient diets and energy through a food web.
Chemical deficiencies are particularly common, and it is often necessary to apply generous amounts of phosphate and traces of numerous other nutrients.
Radioisotopes are used for tracing the pathways of nutrients through ecosystems, for determining the time and extent of transfer of energy and nutrients through the different components of the ecosystem, and for the determination of food chains.
To trace the path of nutrients, they fed sugars and other molecules made with heavier-than-usual forms of carbon and nitrogen to the animals.
What's more, the researchers found that the risk of nutrient loss outweighed the ill effects of trace contaminant exposure from the seafood.
The study of the effects of the concentrations of the selected nutrients allowed us to propose that the best composition of the culture medium of Y. lipolytica (the one with the greatest specific activity) was 10 g/L of olive oil, 5 g/L of yeast extract, 2 g/L of KH2PO4, 1.4 g/L of MgSO4, 2 g/L of NaCl, 0.8 g of CaCl2, and 2 mL of the solution of trace mineral nutrients.
Those projects had proven the first half of the so-called iron hypothesis: namely that windblown dust from land provided the trace nutrient of iron to catalyze the growth of massive algae blooms in the ancient ocean.
Feed contains plenty of phosphorus, but most of it, particularly that in soya, is bound up in a chemical called phytic acid, which mammals cannot digest and which also inhibits the absorption in the gut of trace nutrients such as zinc.
