The Viva columns are based on a wide pore material designed for optimal large-molecule separations. The commercial wide-pore silicas meet the standard 300 Å mean pore size, most have very broad ...

From there, a wide variety of phases are bonded to give chromatographers a stable and selective column. particle size: 1.9 μm, 3 μm, or 5 μm, spherical pore size: 140 Å ...

HC-75 columns separate compounds through ligand exchange. The 8% cross-linked HC-75 uses ligand exchange as the primary mechanism of separation. The different forms ...

HC-75 columns separate compounds through ligand exchange. The 8% cross-linked HC-75 uses ligand exchange as the primary mechanism of separation. The different forms ...

The victory of the Roman emperor Trajan over the Dacians in back-to-back wars is carved in numerous scenes that spiral around a 126-foot marble pillar in Rome known as Trajan’s Column.

It’s also told in 155 scenes carved in a spiral frieze on a monumental column. In back-to-back wars fought between A.D. 101 and 106, the emperor Trajan mustered tens of thousands of Roman troops ...

There's much to enjoy about the retirement years - and you don't need a million dollars to do so. Photo / 123rf Q: I quit my job to look after my terminally ill husband. I am 62 years old. We have ...

"We want to reduce the risk for animals and plants that live on the bay floor, fish and birds being exposed to contaminants such as PCBs (polychlorinated biphenyls), mercury and lead. And to ...

If the numbers are too high or too difficult to subtract in your head, write them down in columns. Separate the numbers into ones, tens, hundreds and thousands. List the numbers in a column and ...

and Pharmacia. The complaint sought compensation for the cost of past cleanups — and for future abatement — of polychlorinated biphenyls, or PCBs. The chemicals tainted and continue to pollute ...