In fact, embryos are light responsive during the first stages of gastrulation, before the differentiation of classical light-responsive structures and only hours following fertilisation (Tamai et al., 2004).
The image holds no clue as to the time of day it was made but there is a quality to the light – or more accurately, to the differentiation of the interior and exterior light – that is hard to place.
Light induces the differentiation of non-photosynthetic proplastids into fully functional, photosynthetic chloroplasts (Su et al. 2012).
Light activates the differentiation of etioplasts into chloroplasts in a process that is accompanied by a large and coordinated increase in the biosynthesis and accumulation of carotenoids, chlorophylls and pigment-binding proteins; this accumulation supports the development of a functional photosynthetic apparatus [ 14, 15, 18].
To establish a correlation between the observed improvement in light perception and the differentiation of Müller cells along the rod photoreceptor lineage, we quantified the cells with GS+BrdU+opsin+ phenotype in cell dissociates of the retina of the animals that had undergone optokinetic test.
Smoking status was defined as the number of cigarette packs per day multiplied by the number of years smoked (pack·year) irrespective of the differentiation of current and past smoking status: never, light (< 20 pack·year), heavy (≥20 pack·year).
The differentiation of vegetative cells into akinetes was not induced by light limitation but iron depletion.
The differentiation of fibroblast-like cells was observed under the phase-contrast light microscopy.
Since 1972, when Light first published his criteria for the differentiation of pleural effusions, additional markers have been proposed.
PS-OCT enables the differentiation of several layers within the retina due to the different light-tissue interaction mechanisms.
