MIlette,
I'd go with "square peg-round hole" here. The PRINCIPLES and PROCESSES that you learn along your PMP journey will certainly help you with managing research projects. While you might think that the new PMI buzzwords do not have a lot to do with the scientific research, they do. At the end of the day, you still much manage the three basics: Scope, Schedule and Budget; and those are the central theme to any research project.
If you are looking at PMP, I say "go for it." You will learn a lot along the way.
Spoken from a 60-something Ph.D. chemist, former research scientist and laboratory manager now consultant.
Best of luck!