Abstract: A method of and apparatus for measuring radon concentration in air involving the provision of a detector containing a passive adsorbent of radon and a desiccant. The desiccant can selectively retain an amount of water weighing from about 25% to about 50% of the weight of the adsorbent. The detector is exposed to a finite air space to be measured for a predetermined time period. The radon is liberated from the passive adsorbent so that the alpha particles and beta particles, which are the signature of radon radioactivity, are counted by liquid scintillation technique.

Abstract: A method is disclosed for isolating a mutant microorganism. The method includes the following steps:(1) separately microencapsulating individual or small numbers of a microorganism population containing the mutant to obtain a first microdroplet;(2) thereafter surrounding the first microdroplet, with or without an outer semi-permeable membrane, with an outer gel-coating to obtain a gel-coated microdroplet, wherein the gel layer contains an indicator material which reacts to the presence of the mutant microorganism;(3) culturing the resultant microcapsules so that the microdroplets containing mutant microorganism are able to induce a detectable difference in the indicator material from microdroplets, containing non-mutant microorganisms; and(4) separating the microdroplets containing mutant microorganisms from those containing non-mutant microorganisms based upon the differences in the indicator material.

Abstract: A cutting and dispensing device (10) having a cutting blade (60) movable along a straight path, a feed means (20) at the entry side of the path of movement and an anvil surface (74) engageable with a pressure wheel (80) at the exit side of the path which, together with the feed means, grip the sheet material during cutting.

Abstract: A method for isolating a mutant microorganism is described. The method comprises the steps of: (a) separately microencapsulating in a semi-permeable membrane each or a small number of microorganisms from a microorganism population containing said mutant; (b) growing said microencapsulated microorganisms including treating to induce a detectable difference between microcapsules containing mutant microorganisms and those containing non-mutant microorganisms; and (c) separating said microcapsules containing mutant microorganisms from those containing non-mutant microorganisms based on said difference.

Abstract: A tamper-resistant package containing in an anerobic environment a leuco dye free of reducing agent which dye becomes colored upon reaction with oxygen.