Introduction

Introduction

Introduction     

The structure of hemigroups

A hemigroup is a continuous binary operation on a spaceM which satisfies (xy)(zy)=xz. The structure of these and their relationship with semigroups is described.     

The Application of Nonlinear Dynamics in Nursing Research

In this article, the authors present an overview of the applications of chaos theory and nonlinear dynamics to problems of relevance not only to nurses, but to anyone dealing with human functioning and interaction. These applications have been in the areas of epidemiology, nursing management and physiological functioning. In some cases, the applications were successful in identifying information that would have been overlooked using traditional methods. In other cases, the problems of data collection and analysis, unique to nonlinear dynamics, are still being developed and tested.     

High-capacity method for purification of human liver hexosaminidase B using hydrophobic chromatography

Hydrophobic chromatography was investigated as a purification procedure for human liver hexosaminidases. Both phenyl-Sepharose and valine-Sepharose have a high binding capacity for hexosaminidases. A degree of resolution between the A and B isozymes is achieved with phenyl-Sepharose.Both hydrophobic supports myst be used close to their capacity in order to recover the applied enzyme.Two purification procedures for human liver hexosaminidase B were employed, which resulted in recoveries of approximately 48 and 24% with final specific activities of 33,400 and 4840 nmole/min·mg, respectively.     

Approaches to the synthesis of 3-fluoroshikimic acids

Exploitation of the dual dehydrating and fluorodeoxygenating properties of the dialkylaminosulfurtrifluorides has allowed access to the C3-fluorinated analogues of (−)-shikimic acid.     

Ab initio SCF MO results for the carborane isomers 3,5-C2B6H8, 1, 7-C2B7H9, and 1,2-C2B7H9

We report the geometry-optimized total energies and bond distances for the closo-carborane isomers 3,5-C₂B₆H₈, 1,7-C₂B₇H₉, and 1,2-C₂B₇H₉ calculated by the ab initio SCF MO method using the STO -3G basis set. Relative energies are compared with those of the other carborane isomers in the 8- and 9- atom classes. These results complete the set of calculations at the same level of theory for all deltahedral carborane isomers except for those of the 11-atom class.     

A measurement of the charge asymmetry in the decay η → π+π−γ

An experiment has been performed at the Rutherford Laboratory to look for a possible asymmetry in the decay η → π⁺π^?γ. The asymmetry for 34 680 eta decay is measured to be 0.012 ± 0.006, which is consistent with no C-violation in this decay mode.