The phrase "a separate topic in" is correct and usable in written English.
It can be used when introducing a new subject that is distinct from the current discussion or context.
Example: "While the current discussion focuses on climate change, renewable energy is a separate topic in the broader context of environmental sustainability."
Alternatives: "an independent subject in" or "a distinct issue in".
Alcohol and drugs do not feature prominently as a separate topic in the National Occupational Standards for Social Work.
Propeller flows and propeller design can be seen as a subtopic of resistance and propulsion; however, because of its importance and the special techniques it features, it is treated as a separate topic in this book.
Some claim that these virtues are more important than reading and writing, but the ability to arrive at informed and thoughtful moral judgments is rarely considered as a separate topic in school.
In the prepared curriculum, evolution is not included as a separate topic in the basic path.
A separate topic guide was nested in the SNSI to explore in-depth, beliefs about diabetes self-management.
Although they are similar to blogs because new content is presented chronologically, the accelerated pace with which it appears and its brevity distinguish microblogs sufficiently from blogs so that the former constitute a separate topic, perhaps to be addressed in a successor to this paper.
Among angiosperms, 42 species stand out for having holokinetic or holocentric chromosomes, i.e., chromosomes with a large kinetochore plate extended along almost their whole length [ 20], which will be treated in a separate topic.
However, due to the extremely large size of LRP-1, detailed mapping of its interaction with PLXDC1 and PLXDC2 is a separate topic that demands systematic work in the future.
Simulation is discussed as an entire separate topic in itself.
Sexual issues do not have to be raised as a separate topic and can also be included in the routine discussions with women.
The quality of quality indicators collected in a set is a separate topic.
