Adsorption Performance of Activated-Carbon-Loaded Nonwoven Filters Used in Filtering Facepiece Respirators.

Filtering nonwovens loaded with activated carbon are among the most popular materials used in the construction of filtering facepiece respirators (FFRs) with anti-odour properties that can be used for respiratory protection at workplaces where the occupational exposure limits of harmful substances are not exceeded. Such FFRs, in addition to a polymer filter material of varying effectiveness, also contain a layer of activated-carbon-loaded nonwoven filter, which limits the quantity of chemical compounds entering the breathing zone. The aim of this work was to analyse the influence of challenge concentration (20-120 ppm), relative humidity (2-70%), flow rate (20-55 L/min), and flow pattern (steady-state and pulsating) on the breakthrough of polymer/carbon nonwovens.

Fast methods for determination of antropogenic actinides and U/Th-series isotopes in aqueous samples.

Rapid and simple methods are applied at the PSI radioanalytical laboratory for determining anthropogenic actinides in waste and nuclear reactor waters (U, Pu, Am, Cm) as well as for analysis of naturally occurring alpha-emitters in continental river and ground water. Anion exchange chromatography followed by alpha-spectrometry as well as alpha/beta-LSC is applied for the reactor coolant waters. To avoid alpha-spectrum interference between 238Pu and 241Am at 5.

[Reference values of chemical constituents and plasma enzymes in minipigs].

Nine male minipigs Pitman Moore have been studied from weaning (To) and during 6 months and the following constituents have been measured: albumin, amylase, bilirubin, calcium, CK, cholesterol, creatinine, copper, iron, GGT, glucose, LDH, magnesium, PAL, phospholipids, potassium, proteins, sodium, ALT, ASP, triglycerides, urea, zinc. These animals were fed a standardized diet. At 6 months of age their weight increased progressively to 12 kg.

[Effects of Aldatense on laboratory tests. Comparison with a reference population].

Aldatense effects on laboratory test results were studied in two subjects groups. - A treated group was paired with an untreated hypertensive group. In these conditions, some parameters were increased by 10 to 20 p.

Plasma lecithin:cholesterol acyltransferase -- reference values and effects of xenobiotics.

Plasma lecithin:cholesterol acyltransferase (LCAT) has been measured by an enzymatic method. We did not observe any significant sex variations, but age variations were found. In females, LCAT activities are stable up to 40 years (60 mumol .