The phrase "a marked variation in" is correct and usable in written English.
It can be used to describe a noticeable difference or change in a particular aspect or characteristic.
Example: "The study revealed a marked variation in the participants' responses to the survey questions."
Alternatives: "a significant difference in" or "a notable change in".
A marked variation in spectral properties with power density of excitation is also found, which has implications for assay design.
Some recent experiments have claimed a marked variation in the luminescence of cadmium selenide quantum dots conjugated to macromolecules linked to bacteria.
In particular, there is a marked variation in the stability regions obtained by simulating the multi-mode model and those obtained by taking averaged relaxation time of the modes.
The main research questions are (1) whether the intensive morphodynamics prior to channelization are reflected by a marked variation in habitat patterns or whether the variation remained within a small range, and (2) which fluvial processes contributed to the evolution of the habitat configuration identified.
Notably, a marked variation in diagnostic thresholds among normal subjects has been reported in the literature [58].
A marked variation in plasmon band intensity was observed at different temperature conditions, 5 50 °C (Fig. 3).
CONCLUSIONS: A marked variation occurred in body fat localization among first-degree relatives of patients with breast cancer and in cancer-free families.
Acid-base homeostasis in dialysis patients is a complicated process affected by multiple variables, all potentially leading to marked variation in an individual patient's pre-dialysis serum bicarbonate.
This provides a partial explanation to the marked variation in aqueous-phase kp of water-soluble monomers seen experimentally with changes in monomer and electrolyte concentrations, which alters the hydrogen bonding patterns in solution.
This uncertainty is a likely contributor to the marked variation in the use of specialty care across the country" [ 19].
Similarly, no hypothesis has yet explained why species have evolved such marked variation in their sleep requirements (from 3 to 20 hours a day in mammals).
