Abstract: Disclosed are (1) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, (2) an alkali-resistant, high-strength porous polymer particle having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, a part of the ester bonds being saponified and converted to a hydroxyl group(s), (3) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, the porous polymer particles being treated with an alkaline solution to generate a hydroxyl and/or a carboxyl group on a surface of the substrate, (4) an anion exchanger comprising any one of the particles (1) to (3) above, (5) a packing material for anion chromatography comprising the anion exchanger (4) above, (6) a column for anion chromatography using the anion exchanger (4) above, and (7) a method for meas

Abstract: Disclosed are (1) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, (2) an alkali-resistant, high-strength porous polymer particle having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, a part of the ester bonds being saponified and converted to a hydroxyl group(s), (3) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, the porous polymer particles being treated with an alkaline solution to generate a hydroxyl and/or a carboxyl group on a surface of the substrate, (4) an anion exchanger comprising any one of the particles (1) to (3) above, (5) a packing material for anion chromatography comprising the anion exchanger (4) above, (6) a column for anion chromatography using the anion exchanger (4) above, and (7) a method for meas

Abstract: To prevent a pulsating flow in a column used for the liquid chromatograph, a flat liquid transferring chamber (6) provided in pressure vessels (1a, 1b) is partitioned by diaphragms (2a, 2b) on both flat sides thereof, and sealed compression chambers (5a, 5b) filled with a compressible substance are disposed facing the diaphragms.

Abstract: A programmable channel selecting apparatus to be disclosed is comprised of a manually operated switch for selecting desired channels and for inputting preset times for desired channel reception, a channel selecting circuit for driving a tuner and a channel indicator in manual/auto channel selecting mode, a channel preselecting circuit which, in channel preselection mode, memorizes a desired channel and a desired time for the channel reception in advance while at the same time causes a channel indicator to indicate the preselected channel and in auto-channel selection mode, applies a preselected channel signal to the channel selecting circuit when time reaches the preset time, those being all connected a common signal line, and an inhibiting circuit for preventing an erroneous operation. With such a construction, inputting and displaying of a selected channel and a preset or preselected channel can be made through one system of a channel preselection switch and a channel display.