Razor blade

Similarly, a sharp edge (razor blade) or a very sharp curve can also provide an intense electric field. For any given electric potential, as the radius of curvature of a tip or edge becomes smaller, the electric field becomes increasingly stronger. 

Sodium benzoate is also finding increasing appHcation as a corrosion inhibitor. It is incorporated into paper wrapping materials for the prevention of mst or corrosion in the production of such diverse items as razor blades, engine parts, bearings, etc. It is also used in the automotive industry as a corrosion inhibitor in engine cooling systems (at 1.5%), mainly in Europe and Japan. Unlike in its appHcation as a preservative where free benzoic acid is required to provide antimicrobial action, it appears to be the benzoate ion that provides the corrosion protection. 

Phenolic resins are useful surface coating materials. Resols are useful for stoving lacquers for coating chemical plant, textile equipment, razor blades, brassware cuid food cans. Phenolic resins are used with poly(vinyl formal) as a flexible, tough and solvent-resistant wire enamel. Oil-soluble resins based on synthetic phenols form the basis of some gloss paints. 

Fig. 7.1. Compact tension test-piece [77], W = 20 mm, B = 4 mm the crack (length a) was introduced by tapping with a razor blade after cooling of the polymer with liquid nitrogen, if necessary...

Champ et al. [47] devised a simple abrasion experiment by measuring the abrasion loss caused by a razor blade scraping under load across a mbber surface. For this an Akron abrader sample wheel was used. They used soft unfilled noncrystallizing mbber compounds based on different polymers. Under these conditions strong abrasion pattern develop. 

Use of tools or glassware that can easily puncture or slice skin razor blades, pins, scalpels, pointed tools, dissecting probes, broken glass Practice common-sense behavior and follow guidelines for use of the tool. Go to your teacher for first aid. 

Self-supporting disks are prepared in several stages an initial slice of material is prepared between 100 pm and 200 pm in thickness. Ductile materials may be rolled, cut with a chemical saw, or spark eroded to produce a thin slice brittle materials may be cleaved with a razor blade or cut with an ultramicrotome (see below). The 3 mm disk is then cut from the slice, using a mechanical punch for ductile materials, while brittle materials need to be spark eroded or drilled. 

Skin snips may be useful in the diagnosis of microfilarial infections such as onchocerciasis in which the parasites circulate in the skin and not the blood. A small (2-mm) skin snip is taken with a needle and a knife. The needle point is stuck into the skin, and the skin is raised. With a sharp knife or razor blade, the skin is excised just below the needle. Alternatively, a scleral punch may be used. The skin snip is then placed in a small volume (0.2 ml) of saline in a tube or a microtiter well, teased, and allowed to stand for 30 min or more. The microfilariae migrate from the tissue into the saline, which is then examined microscopically to demonstrate the wiggling microfilariae. 

We found that solutions of hen egg white lysozyme, bovine ribonuclease A (RNase A), or a 1 2 mol ratio of bovine carbonic anhydrase lysozyme formed opaque gels within 2 min when mixed with an equal volume of 20% NBF.25,26 Multi-protein tissue surrogates comprised of 50% w/v lysozyme and up to four additional proteins have also been formed (Fowler et al., unpublished results). After overnight fixation, the surrogates were firm and sliced easily with a razor blade for sampling. To determine the optimal... 

Place several layers of filter paper on a smooth, hard surface, and place a blotting membrane on top (see Fig. 1). Depending on the size of the tissue, use a single- or double-edged razor blade to cut a tissue section 0.2-2.0 mm thick, depending on the particular tissue sample. It is necessary... 

Cool the bark tissues (25 g FW [fresh weight]) on ice and cut into small pieces (about 5x5 mm) with a razor blade. 

Trim block face to a trapezoid with greaseless razor blade. 

Cut the alginate beads into small cubes of 1.0 X 1.0 cm2 square using a razor blade. 

Fracture tips in half longitudinally with a razor blade and a hammer (using a binocular microscope). 

Peel off the plastic film with forceps or razor blades. 

Trim and peel the blocks from the slides with razor blades and forceps. 

Remember that it is important to assess for suicidality when working with any client with a history of suicidal and parasuicidal behavior. Not only ideations should be assessed, but also plans, lethality of plans, means to carry out those plans, and proximity of means. You would surprised at how often such clients carry lethal doses of pills, razor blades, or even guns in their purses, pockets, or backpacks during such an assessment interview with intentions to use these items. (Please see the extended discussion about suicide assessment in Chapter 3.)... 

In addition, the therapist should ask the client whether she or he has access to the instrument of harm (e.g., a gun or razor blade). If the instrument is at home, the therapist should ask the client to call a friend or relative and ask that person to remove that instrument from the client s access. If the client is unwilling to do so, then legal steps may have to be taken to protect him or her (discussed shortly). The therapist also should ask whether the client has the instrument on him or her right now (e.g., in a backpack or purse, in the car out in the parking lot, in a pocket or jacket, etc.). If so, you need to ask the client to give the instrument to you. The exception to this request might be if the instrument is a loaded firearm,... 

Razor blade, playing card or some other sharp-edged instrument... 

Visceral Fetal Examinations. The examination of the abdominal and thoracic viscera of fetuses is performed either fresh without fixation ( Staples technique ) or after Bouin s fixation by making freehand razor blade sections ( Wilson s technique Wilson, 1965). Both techniques have advantages. The fresh examination technique, which may require less training for thorough proficiency, provides a more easily interpreted view of heart anomalies. The examination must be performed on the day the dam is terminated, however, so having a large number of litters to examine in one day requires that a large team of workers be committed to the task. 

Finally, periodic cleaning of the burner head and nebulizer is needed to ensure minimal noise level due to impurities in the flame. Scraping the slot in the burner head with a sharp knife or razor blade to remove carbon deposits and removing the burner head for the purpose of cleaning it in an ultrasonic cleaner bath are two commonplace maintenance chores. The nebulizer should be dismantled, inspected, and cleaned periodically to remove impurities that may be collected there. 

The beginning was not easy," Mark explains, "but related experience in Vienna and the peerless support of Rogers and (Dean R. E.) Kirk made the Institute a quick success." The success was also in part brought about by the labors of a future "who s who" contingent of associates attracted by Mark. A few of the scientists who came to work in the converted razor blade factory which housed the Polytechnic laboratories are T. Alfrey, P. M. Doty, F. Eirich, I. Frankuchen, W. P. Hohenstein, H. Morawetz, C. G. Overberger, C. C. Price,... 

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