From a market perspective, differences in metabolite patterns of food from different production systems are of interest in assuring the authenticity of food products marketed as organic [ 8].
From a molecular perspective, differences in the level of expression of a cell adhesion molecule (cadherin) have been experimentally shown to cause cell sorting [2].
From a practical perspective, differences in GTM profiles and metabolism within putatively isogenic mice could result in significant unforeseen variation in the effects of drug treatment in experimental animals and ultimately in humans.
To put these numbers in perspective
From an epigenetic perspective, differences in promoter DNA methylation levels between line 63 and line 72 chickens have been found in several candidate genes [ 19].
From an adaptive perspective, differences in beak length are the most interesting because of the clear ecological relevance of this trait.
However, from a contemporary scientific perspective, difference in cognitive involvement or processing seems a matter of degree, rather than the absolute distinction that an assumed metaphysical dualism of intellect and body seemed to many, in the past, to require.
The reason why 20 feet (6.1 m) is used for checking visual acuity is that this distance is essentially infinity from an optical perspective (difference in optical power required to focus at 20 feet versus infinity is only 0.164 diopters), so 20 feet (6.1 m) satisfactorily represents human distance vision.
Our study demonstrated that, independent of the viewing perspective, differences occur in the way open play situations are perceived by referees of different levels.
We investigate this from three perspectives: (a) differences in Criterion® holistic scores due to prompts (prompt difficulty), (b) relationships between Criterion® holistic scores and indicators of L2 proficiency, and (c) longitudinal changes in Criterion® holistic and writing quality scores.
