The key component to enhance the sensitivity of the gas analysis system is the preconcentrator which accumulates, concentrates and releases the concentrated analyte upon applying a heating pulse.
Colonel Henry Hunt, the Union chief artillerist, who accumulated and concentrated the Union guns, did commendable work, as did Colonel A.A. Humphreys, the principal topographical engineer, who placed the troops.
Plants have been found to accumulate and concentrate the heavy metals within.
Passive samplers typically work by accumulating and concentrating chemicals from the surrounding water over time, allowing analyses to identify temporally short concentration surges that might be missed by water grab samples, and potentially reducing analysis and sample handling costs, allowing a greater number of sites to be monitored.
This is important because exposure to substantial concentrations of contaminants is probably more likely before metamorphosis, because most amphibian embryos and larvae are strictly aquatic and cannot readily escape water bodies where many contaminants accumulate and concentrate.
The cryocollection of HP Xe utilized by most hyperpolarizers (to accumulate and concentrate HP Xe and remove buffer gases) also helps to remove residual Rb; however, cryocollection can also result in hyperpolarization losses and adds significantly to instrument complexity (hampering full automation).
Open image in new window Fig. 1 Microphotograph of an accumulated plankton sample concentrated using a 20 μm mesh sieve, collected from St. 1 of Samut Songkhram in December 2012.
The reality, of course, is that the democratic ideal is vastly compromised by accumulated wealth and concentrated power.
As intraciliary Ca2+ accumulated, it became concentrated enough to gate the Cl− channels, and a second increment of current gradually appeared (beginning at t = 2.9 s in Fig. 2A).
The CR concentrate and INAM cultures accumulated significant concentrations of acetic acid, albeit to a lesser degree than WT.
