Cozymase. A study of purification methods

Cozymase is one of the essential components of the complex enzyme mixture which effects alcoholic fermentation in the absence of living cells. The separation of the mixture into zymase and cozymase was first accomplished by Harden and Young [1] by means of ultrafiltration through a gelatin-impregnated Chamberland filter candle. The residue and filtrate as thus prepared possessed, separately, no fermentative action, but when mixed were found to produce a rapid fermentation. The active constituent of the residue was named zymase, while that constituent of the filtrate responsible for the reactivation of the residue was named cozymase. We studied the purification produced in our material by a variety of reagents. In the investigation we have repeated much of the work done by von Euler and Myrbäk [2], and several differences have been found, which appear difficult to explain solely upon the basis of the lower initial purity of our material. As certain of the experiments show distinct promise, we hope to be able to extend the work upon a material of considerably higher original purity, such as was employed by von Euler and Myrbäk

An Investigation of Flame Spread over Shallow Liquid Pools in Microgravity and Nonair Environments

Experiments of interest to combustion fundamentals and spacecraft fire safety investigated flame spread of alcohol fuels over shallow, 15 cm diameter pools in a 5.2 sec free-fall, microgravity facility. Results showed that, independent O2 concentration, alcohol fuel, and diluent types, microgravity flame spread rates were nearly identical to those corresponding normal-gravity flames for conditions where the normal gravity flames spread uniformly. This similarity indicated buoyancy-related convection in either phase does not affect flame spread, at least for the physical scale of the experiments. However, microgravity extinction coincided with the onset conditions for pulsating spread in normal gravity, implicating gas phase, buoyant flow as a requirement for pulsating spread. When the atmospheric nitrogen was replaced with argon, the conditions for the onset of normal-gravity pulsating flame spread and microgravity flame extinction were changed, in agreement with the expected lowering of the flash point through the thermal properties of the diluent. Helium-diluted flames, however, showed unexpected results with a shift to apparently higher flash-point temperatures and high normal gravity pulsation amplitudes

The military revolution thesis: a comparative analysis of early modern Siena, Mantua and Valletta

The Military Revolution thesis has traditionally been associated with large states which embraced its changes and achieved hegemonic status, while small states have generally been thought to lack the pre-requisites required to benefit from the Revolution resulting in their marginalisation. This paper attempts to offer an alternative dimension to the great-power centric narrative of the Military Revolution thesis through the comparative analysis of three small states, Siena, Mantua, and Malta, with a particular focus on Valletta. This short paper is inadequate to explore the full range of the Military Revolution thus the study will be constrained to a single important element within the thesis; a comparative evaluation of the trace italienne fortifications of Siena, Mantua, and Valletta, and whether these lessened the viability of small states, as the case of Siena suggests, or bolstered it, as demonstrated by Mantua during the 1620’s. The inclusion of Valletta’s enceinte seeks to add a third element to this discussion, shedding light both on the viability of the trace italienne as well as Malta’s situation relative to other small states.peer-reviewe

Synthesis and reactions of oxazolopyridinium salts and related heterocyclic systems

2-Substituted oxazolo[3,2-a]pyridinium salts have been synthesised starting from the appropriat

Fletcher, Howard

Co. E 365th Infantryhttps://dh.howard.edu/prom_members/1027/thumbnail.jp

Propagation of a Topological Transition: the Rayleigh Instability

The Rayleigh capillary instability of a cylindrical interface between two immiscible fluids is one of the most fundamental in fluid dynamics. As Plateau observed from energetic considerations and Rayleigh clarified through hydrodynamics, such an interface is linearly unstable to fission due to surface tension. In traditional descriptions of this instability it occurs everywhere along the cylinder at once, triggered by infinitesimal perturbations. Here we explore in detail a recently conjectured alternate scenario for this instability: front propagation. Using boundary integral techniques for Stokes flow, we provide numerical evidence that the viscous Rayleigh instability can indeed spread behind a front moving at constant velocity, in some cases leading to a periodic sequence of pinching events. These basic results are in quantitative agreement with the marginal stability criterion, yet there are important qualitative differences associated with the discontinuous nature of droplet fission. A number of experiments immediately suggest themselves in light of these results.Comment: 15 pages, 7 figures, Te

Moonlight In Monkey Land

https://digitalcommons.library.umaine.edu/mmb-vp/4414/thumbnail.jp

How\u27d You Like to Have Me for a Sweetheart?

https://digitalcommons.library.umaine.edu/mmb-vp/1617/thumbnail.jp

A man who endures a study of the character of Jason Compson in Faulkner\u27s The Sound and the Fury

Faulkner has stated his belief that man will not merely endure but will prevail. In order to prevail, man must transcend his belief that he is immortal merely because he can endure and must accept the fact that he has a soul capable of love and selfessnes

Issue Brief: Office holding and SES/Class

This issue brief discusses office holding and socio economic status in federal representation in Congress. It also touches the issues of minorities and office holding