Removal of Microorganisms from Water Using Pyridinlum Type Polymers.

Chlorination processes that are used generally for water purification produce trihalomethanes and other toxic chemicals and are not completely effective in destroying viruses. An alternate process replaces chlorine with pyridinium derivatives. N-Benzylpyridinium bromide and N-benzylpyridinium chloride are the most effective. The process u..

Chromatographic Separation and Concentration of Sulfur Cioxide in Flue Gas.

Experiments used synthetic mordenite to separate and concentrate sulfur dioxide from a flue gas stream by water driven desorption, a chromatographic phenomenon known as rollup. Results showed that the rollup effect was influenced by temperature, regeneration conditions, and the feed concentrations of sulfur dioxide and water. Increases in..

Full Steam Ahead for Low Nitrous Oxide, Boiler Research and Development.

Industrial boilers that use natural gas produce 87 percent of total nitrous oxide emissions. New regulations mandating the reduction of these emissions are driving research on low nitrous oxide steam generation technologies. Nitrous oxide is the combustion byproduct of nitric oxide and nitrogen dioxide. Thermal nitrous oxide is the major ..

New Rapid Method to Determine Water Vapor Permeabiity of Textiles and Similar Materials.

A new, rapid method indirectly tests the water vapor permeability of textiles by measuring the reduction in surface resistance of a thin absorber positioned on the sample. Water vapor permeability is an important property in both apparel and industrial textiles. The method involves subjecting the sample to a drop in water vapor pressure. ..

Hygienic Goods for Elderly, Infirm.

Kindwear has introduced a line of sheets, towels, and other textile products designed specifically for the elderly and the infirm. The products are made of antibacterial and deodorizing materials, and are soft on the skin. Kindwear expects to generate about $1 million in first year sales of its Broccoli line, which comprises 15 items. Kin..

Revolutionary Advances in Suture Technology.

The most important technological advance in sutures was the development of manmade absorbable fibers in the early 1970s for wound closure. The sutures, which are made from a linear aliphatic polyester, are completely metabolized, eliminating foreign body reactions. Common derivatives of the polyester are polyester are polyglycolide and po..

Sutures -- Some Open Thoughts on Wound Closures.

After World War II< polymers, such as nylon, polyester, and polyolefin, replaced silk in nonabsorbent sutures. Polyglycolic acid, polylactic acid, and polydioxanone replaced catgut or regenerated collagen in absorbent sutures. Bioabsorbency, particularly for internal suturing, is optimal because permanent sutures can act as foreign bodies..

Accelerated Lightfastness Testing of Disperse Dyes on Polyester Automotive Fabrics.

The accuracy of the standard accelerated lightfastness test method for automotive interior materials (SAE J1885) is questionable because samples are exposed to short wavelength ultraviolet energy that may cause anomalous results. The High Irradiance Test is an alternative method that uses a filtered xenon arc light source. This light sour..

Nondestructive Tests on Polymer Composites Via the Analysis of Acoustic Emission.

Acoustic emission characterized glass, carbon, and aramid fiber reinforced polyester composites in the initial, nondestructive range of tensile, bending, and compressive stresses. The acoustic emission method determined the interfacial damage of the composite and evaluated the quality of the fibrous reinforcement finish as well as the ult..

Safe Handling.

Aquafilm Limited, based in the United Kingdom, recently introduced a water soluble polyvinyl alcohol film bag to eliminate the handling of potentially hazardous dyes and pigments. The bags contain premeasured dye formulations and dissolve completely after they are added to the bath, releasing the dye. The bags are nontoxic and fully biode..