Sentence examples for difficult to delineate precisely from inspiring English sources

With positron emission tomography (PET) scans, the detected intensity tapers off over distance from the source, so it is difficult to delineate precisely where the intensity is no longer apparent.

Because the border between VA and VM is difficult to delineate precisely, we extracted a "virtual border" from a standard rat brain atlas (Paxinos and Watson 2007) and used it to divide the intensely GAD67-immunoreactive BZ accordingly.

Although this set of genes is difficult to delineate precisely, there is reasonable confidence regarding the transfer of several hundred genes, so these genes necessarily have to be taken into account in any reconstruction of mitochondrial genome evolution.

First, natural behaviour is difficult to delineate because of its variability and flexibility.

Due to their high sequence similarity and consequent functional overlaps, it is difficult to delineate specific functions of Atg8 proteins in autophagy.

The creation of manual ground truth was tedious and challenging and we found it difficult to delineate the cell boundaries of clustered cells and cells undergoing cell division.

Since individual lesions often become confluent in advanced MS and are thus difficult to delineate, we quantified the overall lesion load per patient rather than individual lesion sizes.

Species limits in Diospyros are difficult to delineate, but in parts of the Asian tropics many clearly very different species grow together.

The normal anterior urethral lumen may be difficult to delineate without a catheter in place.

But for the domain scientist it can be difficult to delineate these insignificant values.

However, it is difficult to delineate how much wild or domestic predators affect the dynamics of the ecosystem.