Electronic cleansing

A wide class of aiyl-based quaternary surfactants derives from heterocycles such as pyridine and quinoline. The Aralkyl pyridinium halides are easily synthesized from alkyl halides, and the paraquat family, based upon the 4, 4 -bipyridine species, provides many interesting surface active species widely studied in electron donor-acceptor processes. Cationic surfactants are not particularly useful as cleansing agents, but they play a widespread role as charge control (antistatic) agents in detergency and in many coating and thin film related products. 

Methanol is available in Technical, C.P. (99.85% purity) and electronic (used to cleanse and dry components) grades. US Spec 0-M-232E (July 30, 1968) with Amd 1 (Sept 11, 1970), covers the requirements and tests for methanol used by all Federal agencies (see below)... 

There are two types of reaction involving metals (1) in which the metal is a reagent and is consumed in the process and (2) in which the metal functions as a catalyst. While it is certainly true that any cleansing of metallic surfaces will enhance their chemical reactivity, in many cases it would seem that this effect alone is not sufficient to explain the extent of the sonochemically enhanced reactivity. In such cases it is thought that sonication serves to sweep reactive intermediates, or products, clear of the metal surface and thus present renewed clean surfaces for reaction. Other ideas include the possibility of enhanced single electron transfer (SET) reactions at the surface. 

Uses Manufacture of fluorocarbon refrigerants, fluorocarbon plastics, and propellants solvent for natural products analytical chemistry cleansing agent soil fumigant insecticides preparation of chlorodifluoromethane, methyl fluoride, salicylaldehyde cleaning electronic circuit boards in fire extinguishers. 

As it turned out, CFCs were ideal for the purpose. The members of this chemical family are nonflammable, noncorrosive, nontoxic, odorless, and very stable. Within a short period, they became widely popular for a variety of industrial applications. In addition to their applications in refrigeration systems, they became popular as aerosol propellants, cleansing agents for electrical and electronic components, and foaming agents in the manufacture... 

Grade Technical, CP (99.85%), electronic (used to cleanse and dry components), fuel. 

Methods have been developed to carry out an electronic cleansing" of the colon wall when contrast medium is still present. An interesting current target is to reduce strongly the radiation dose of the CT scan, and still be able to detect the polyp struc-... 

Several studies have shown that patients acceptance of CTC is greater than conventional colonoscopy or double contrast barium enema (Taylor et al. 2003). Development of minimal bowel prep or prep-less CTC through fecal tagging and electronic cleansing appears to be within reach, thus making a truly prep-less colorectal screening test an attractive possibility (Lefere et al. 2002). 

Pickhardt PJ, Choi JH (2003) Electronic cleansing and stool tagging in CT colonography advantages and pitfalls with primary three-dimensional evaluation. Am J Roentgenol 181 799-805... 

A 3D evaluation will be less time-consuming and labor-intensive if the colon is empty colonic contents can hamper an efficient review as fecal material can resemble a polyp and fluid levels can hamper polyp detection. In principle an empty colon can be achieved in two different ways. The colon can be cathartically prepared with a laxative agent or its contents can be tagged after which it can be electronically cleansed. 

Patient compHance is stiU under debate, since colonoscopy is performed in most of the cases under sedation, without any pain suffered by the patient. However, the worst part of the exam is usually the pre-Hminary bowel cleansing (Gluecker et al. 2003). The advantage of CTC is the use of gentler preparation (now available) or unprepped examination (still under investigation). Furthermore, the pain related to colon distension by air may be minimized by the use of CO2 dehv-ered by an electronic pump with pressure and volume control. The use of CO2 is also associated with a faster resorption, making the patient more comfortable immediately after the examination (Burling et al. 2006). 

Other toxic metals are solved in a similar fashion bind, add electrons, release, repeat. One chromium-cleansing enzyme is proactive, intercepting the chromium outside the cell. Sometimes just phosphate will do the same job. If yeast cells detect the heavy metal cerium in the environment, they eject phosphate and make a cerium phosphate crust around the cell, while the insides stay fluid. 

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