The phrase "a practical source of" is correct and usable in written English.
It can be used when referring to something that provides useful or applicable information, resources, or support in a specific context.
Example: "The internet is a practical source of information for students conducting research."
Alternatives: "a useful resource for" or "a valuable provider of".
Recent progress within the international fusion community increases the likelihood that controlled fusion will become a practical source of energy within the next half-century.
And like a significant number of people who didn't know the truth about Stalin, he believed that Communism was both a moral ideal and a practical source of good.
The work described in this paper was conducted to determine whether llamas (Lama glama) are a practical source of antigen-specific VHH fragments.
But for a magnesium combustion engine to function as a practical source of energy, the lasers need to be powered by a renewable energy source, such as solar power.
Even if ignition is achieved in the laboratory in the next several years, scaling up to a demonstration plant will cost billions and may ultimately show that fusion is not a practical source of power.
ITER will be the first magnetic fusion experiment to operate under reactor-relevant plasma conditions and to demonstrate the key technologies needed for a practical source of electrical power.
Since the previous study did not clarify the feasibility of using serum DNA as a practical source for detection of EGFR mutations, in the present study, we sought to demonstrate that EGFR mutation status determined in serum DNA is the same as in actual tumour samples.
To ignore the part zoos have to play here would be dishonest, and to pretend that there is any practical source of funds to support this vital work other than paying guests is disingenuous.
The placenta can be a valuable and practical source of cells for the engineering of select fetal tissue constructs.
The amniotic fluid can be a reliable and practical source of cells for the engineering of select fetal tissue constructs.
The practical source of an emperor's power and authority was the military.
