A basic protein has been isolated from pig brain. The purification procedure consisted of repeated extractions with chloroform-methanol (2: 1 v/v), 10% sodium chloride, and dilute hydrochloric acid. The pH 2.4 to 2.6 fraction obtained from the repeated acid extraction was further purified by pH and (NH&SO4 fractionation, Sephadex G-100 gel filtration, and chromatography on Amberlite IRC-50 with...

Of the three magnesium fractions in plasma, free ionized magnesium (Mg2+) has the greatest biological activity. Accordingly, information concerning this form in plasma is of cardinal importance to investigations in biometry and human pathology. For this reason, we developed an indirect assay for ionized magnesium in which Mg2+ is determined as the difference between ultrafiltrable magnesium, as...

The illicit addition of phosphodiesterase type-5 (PDE-5) inhibitors like sildenafil (Viagra) in product offered as herbal medicine or dietary supplement for male erectile dysfunction has concerned authorities in recent times. In this paper, we proposed a sensitive surfactant-coated Amberlite XAD™ resin for sildenafil preconcentration method with spectrofluorimetric detection. Retention capacity...

In the context of CO2 removal from biogas, a series binderless zeolite LTA adsorbents with macroscopic bead format (0.5–1.0 mm) and hierarchical porosity (i.e. zeolitic micropores being accessible through meso- macropores mainly in 10–100 nm range) was synthesized variety Si/Al ratios (1.2–3.9) using Amberlite IRA-900 anion-exchange resin beads as hard template. The CH4 adsorption capacity Na-f...