California Institute of Technology

The Crystal Structure of Nickel Ethylenedibiguanide Chloride Monohydrate

The crystal structure of nickel ethylenedibiguanide has been determined from three-dimensional, x-ray diffractometer data (3087 reflections). The compound, Ni(C6H16N10)Cl2·H2O, crystallizes in the centrosymmetric monoclinic space group P21/c. The unit cell contains four molecules...

Hydrodynamic Shear Breakage of Deoxyribonucleic Acid

Deoxyribonucleic acid (DNA) was broken by hydrodynamic shear in a capillary. The effects of parameters associated with chemical reactions, temperature, catalysts, and ionic strength, were examined to determine the possible effect of a chemical reaction upon the breakage. No catal...

Multiple Angle, High Resolution Photoelectron Spectroscopy

A variable angle, high resolution photoelectron spectrometer has been built and is now being put into operation. This instrument, which uses 180 degree hemispherical analysers of 2.5 inch mean radius and a cylindrical scattering chamber, is thought to be different enough from pre...

The Synthesis of Propidium Iodide

The dye-buoyant-density method for separation of circular and linear DNA is reviewed, and an improved dye proposed. The synthesis of the dye is described, and its feasibility as a general method discussed.

Low Molecular Weight Substrates for Lysozyme

Preparation of short chain polymers of N-acetylglucosamine by acid hydrolysis of chitin was undertaken. Separation of the various chain lengths of the hydrolysis breakdown products was done by column chromatography on charcoal-celite with an ethanol solvent. Preparation of the di...