Keywords are from 5 to 8 main terms used in the paper.
Keywords convey the main substantial content of the paper, serve as a guide for the reader, and are used to search for papers in electronic databases, so they should highlight the discipline (the field of science within which the paper is written), the research topic, aim, and object.
Keywords should be arranged in the order from the most general ones, corresponding to the problem, to more differentiated, corresponding to the description of research participants and methods.
Laboratory jargon and neologisms, excessively long phrases, phrases with homogeneous parts should not be used as keywords.
It is better to use words commonly occurring in other publications on the subject.
Both single words and word combinations in the singular and nominative case can be used as keywords. The number of words in the key phrase should not exceed three.