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.

Solvent Effects on the Infra-Red Spectra of Hindered Phenols

Abstract: The effects of variation in the shapes of the solvent and solute molecules have been studied in the hindered phenol series. When a solvent/solute complex is broken by thermal agitation it seems that reassociation of the phenolic OH with another solvent molecule occurs very rapidly. However, the introduction of bulky substituents in the immediate neighbourhood of the OH group lengthens the time between collisions suitably oriented for association. It then becomes possible to detect free OH absorptions corresponding to solute molecules in transit from one molecular association to another. These occur even in such strongly bonding solvents as ethers, and the proportions increase with the complexity of the hindering groups. Similar effects are found when a hindered phenol is examined in a series of solvents of increasing complexity, confirming that there is a dynamic equilibrium between free and associated OH groups. The OH group in the hindered phenols is largely coplanar and only in the 2,6-di- tert. -butyl derivative is there any direct steric hindrance to the approach of the solvent molecule.

The control of foaming. I. The mode of action of chemical anti‐foams

Abstract: A large number of substances were tested for ability to destroy the foam on four(different foaming aqueous solutions. The ability or inability of the anti-foams to spread on the foaming liquid was also studied. It is concluded that anti-foams act by displacing from the surface the substance causing the foaming (or, in salt solutions, preventing negative adsorption). They may do this either by dissolving in the foam liquid or bespreading over its surface.) The causes of the strong, correlation (found) between foam-killing and spreading are discussed.

Pasteurella septica: the Occurrence of Type-Specific Polysaccharides containing Aldoheptose Sugars

Abstract: PIROSKY1 has shown that strains of Pasteurella septica produce lipopolysaccharide antigens with similar properties to the endotoxins of certain other Gram-negative bacteria. We have isolated lipopolysaccharides from some strains of P. septica and studied their serological specificity in relation to the immunological status of the strains as measured by passive protection tests2,3.