Note: A cryogenic, ultra-high-vacuum, microwave filter which passes a narrow beam.

We report on a device which filters microwave radiation prone to heating cryogenic experiments while at the same time allowing large apertures which will not disturb a propagating beam. A method for evaporating thin films onto the inner face of a narrow tube is also described.

[Modification of the gas chromatographic method for identifying gaseous metabolites of microorganisms]. / Modifikatsiia gazokhromatograficheskogo metoda opredeleniia gazoobraznykh produktov metabolizma mikroorganizmov

A procedure for analyzing gaseous products resulting from metabolic processes of microorganisms has been developed. The procedure allows a distinct separation of gaseous products (H2, O2, N2, CO2, H2O, etc). The relative error ranges from 3.4 to 2.9% depending on the concentration of the gas in the volume tested.