Ministry of Supply

About: Ministry of Supply is a based out in . It is known for research contribution in the topics: Polarography & Bacillus (shape). The organization has 416 authors who have published 355 publications receiving 8951 citations. The organization is also known as: MoS.

The respiratory retention of bacterial aerosols: experiments with radioactive spores.

Abstract: The distribution of inhaled bacterial aerosols has been studied in guinea-pigs, monkeys and mice, using Bacillus subtilis spores labelled with radiophosphorus. Particle sizes from about 1 to 12μ have been used.The guinea-pig shows the expected change of distribution with particle size; the proportion retained in the head increases with increased particle size. The figures correspond closely with those for man. Monkeys show similar results but are more irregular.The subsequent fate of the retained particles has been studied and accords with what is known about ciliary removal.The work is intended to link with parallel investigations of respiratory infection in closely similar conditions, and its implications are discussed in a paper on that subject (Druett et al. 1953).

Inormation Theory and the Design of Radar Receivers

Abstract: The paper deals with the problem, frequently encountered in radar, of extracting simple numerical information from a noisy waveform. It is suggested that the only ideal way of doing this is to use the principle of inverse probability and convert the wave-form into a probability distribution for the quantity sought. The method is applied to the problem of determining the time delay of a periodically modulated rf waveform in the presence of white Gaussian noise when the undelayed waveform without noise is exactly known. As a result, the matched predetection filter of Van Vleck and Middleton is automatically specified, and the theory of ideal detection is briefly indicated.

Continuous-flow culture of the filamentous mould Penicillium chrysogenum and the control of its morphology.

Abstract: Continuous-Flow Culture of the Filamentous Mould Penicillium Chrysogenum and the Control of its Morphology

Tables of Second Virial and Low-Pressure Joule-Thomson Coefficients for Intermolecular Potentials with Exponential Repulsion

Abstract: The potentials used are functions of r, the distance between the centres of the molecules, but not of their relative orientation. The long-range attraction between the molecules is taken to be the sum of terms proportional to r$^{-6}$ and r$^{-8}$, and the short-range repulsion is proportional to e$^{-\rho r}$. This potential has four parameters: the position and depth of the minimum of the potential, the relative importance of the r$^{-8}$ term, and the steepness of the exponential repulsion. The second virial and low-pressure Joule-Thomson coefficients are tabulated for the range of parameters likely to be found in actual molecules, and for temperatures from the critical temperature to about 20 times this value. The most important of the three quantum corrections is tabulated over the same ranges.

Biochemical changes occurring during sporulation in Bacillus species.

Abstract: is too fast to be measured by the methods used. The second step, which involves the acylation of the enzyme and the concomitant liberation of pnitrophenol, is characterized by the rate constant k2= 3-15 sec.-'. The third step involves the liberation of acetate and reactivation of the enzyme; the rate of this reaction is defined by kI3= 0-0254 sec.-'. 2. The rate constant k2 for the second step is, within experimental error, the same at pH 6-45 and pH 7*75; from this and other available evidence it is suggested that it involves the acetylation of the OH group of a serine residue in the enzyme. The third step has a pH dependence similar to that previously found for the overall rate of reactions catalysed by chymotrypsin, and it is suggested that itinvolvesthe imidazole group ofa histidine residue ofthe enzyme.