Now the difficulty to visualize planar defects in boron carbide nanowires becomes obvious.
A major drawback of the tumour models is the difficulty to visualize the endogenously formed tumours.
Thus, it does not appear that difficulty to visualize the tumour border on ultrasound indicated a factor correlating with the number of immune infiltrating cells.
The source of this ambiguity stems in part from the difficulty in trying to visualize the FG-domains in vivo, which is evident given the lack of resolution even when using state-of-the-art structural techniques such as cryo-tomography (cryo-ET) to detect the FG-domains (Beck et al. 2004, 2007; Stoffler et al. 2003).
However, given the difficulty some students experience with visualizing water level (Liben, Christensen, & Kastens, 2010), students may well have difficulty applying the lesson to visualize an imaginary waterline on topography in the field.
The level of GABA neuron contamination was higher in the VTA samples, which could have resulted from an increased difficulty to microscopically visualize, select, and extract often smaller more clustered VTA dopamine neurons during the laser microdissection process [ 2].
Despite these technical difficulties, AFM is being used increasingly to visualize ultrastructural details on hydrated cells.
As a quantitative variable, carotid IMT is a feasible technique for evaluating subclinical atherosclerosis but may have several limitations when defining plaque, including inability to visualize intracranial vessels, difficulties in detecting near-total occlusion, and high reliance on operator skill [ 23, 24].
However, radiography is severely limited by its inability to visualize cartilage, the difficulty of ascertaining the optimum and reproducible positioning of the joint in serial assessments, and the difficulty of grading joint space narrowing visually.
In order to visualize the change in item difficulty estimates, the baseline estimates were plotted against all other evaluation time points [ 54].
