A number of mechanisms have been shown to have a role in fostering CSD wave initiation and propagation including: ion diffusion, membrane ionic currents, osmotic effects, spatial buffering, neurotransmitter substances, gap junctions, metabolic pumps, and synaptic connections (Figure 1). Figure 1 Mechanisms and structures involved in the pathogenesis of migraine with aura.
That would cause an entirely different view of things, wouldn't it?" Palin has taken steps to close the substance gap.
Even without the secrecy and the substance gaps, the inquiry would still have been unsatisfactory because of how it came to be constituted.
And, as the shop in Greenwich shows, many new substances are filling the gap.
Although a number of studies are available on regulated substances, there is a gap of studies on unregulated substances, such as carbonyl compounds, emitted during the combustion of biodiesel, biodiesel diesel and/or ethanol biodiesel diesel blends.
These new requirements both for data and for proving safe use are expected to promote the development and use of safer chemical substances, closing the technology gap by fueling new investment in green chemistry science, technology, and education (Black 2008; Buckland 2008; Henzelmann et al. 2007).
Substances with larger energy gaps are generally insulators, materials with smaller energy gaps are semiconductors, and conducting materials have very small or no energy gaps.
And the more Clarke props up Australia's top order with yet another innings of bravery and substance, the wider that gap appears.
These experiments demonstrate 1) that multiple IR forms of the LHRH prohormone exist in the POH of the rat and 2) that nerve terminals of the LHRH neurons contain LHRH, GAP1-56, and some lower mol wt GAP-like substances.
The BBC's political editor Nick Robinson said, "Gordon Brown's aim today appears to be to look and sound different from Tony Blair whilst simultaneously opening up no gap of substance with him and the decisions he took".
We decided to use chemical categories for the case study, rather than using pairs of individual chemicals, because data available for any source substance in a category may be used to fill information gaps for substances with missing data.
