Gelatin specialized

Trade name of a sensitized gelatinous special explosive distributed in Germany and exported by WASAGCHEMIE. It is used for seismic prospecting and mud capping. 

Many amino-acjds are easily identified as their 3,5-dinitroben2oyl derivatives (Saunders, Biochem. Jour., 1934, 28, 580 1942, 36, 368). Cystine, however, forms a gelatinous derivative, but is readily identified by special tests. Tyrosine does not form a derivative under these conditions. 

Figure 14.10 illustrates the method of seismic prospecting on land by what is known as reflection shooting. A hole usually 10 to 12 cm in diameter is drilled to a depth of 15 to 30 m. The charge of explosive is likely to be 5 to 12-5 kg and the stemming used is usually water. As the explosive must fire under a depth of water which may exceed 45 m, special varieties of gelatines are employed (see p. 53). Alternatively, a powder explosive can be sealed into pressure-resistant metal containers. Special detonators are also employed, not only to withstand the possible head of water, but also to have a specially short bursting time (see p. 113). 

Special gelatine. A gelatine explosive in which the main oxidising ingredient is ammonium nitrate. 

The baskets need special care and examination. They can become frayed, misshapen, or warped with use. Screen mesh size may change over time, especially when used with acidic medium. Baskets are especially prone to gelatin or excipient build up if not cleaned immediately after use. 

Invasiveness of the chemiluminescence (CL) lines was measured by in vitro and in vivo methods. The in vitro monitoring process comprised the movement of cells across a membrane of defined pore size within a specially designed growth chamber or MlCS (membrane invasion culture system). A 10-p diameter Nucleopore membrane was coated with a mixture of laminin (to promote invasion), collagen, and gelatin. Cells were added to the top side of the chamber in media and the extent of cell movement into the bottom of the chamber (invasion) through the membrane determined. 

Direct development by sulfite ion does not take place, probably because the rate of reduction of silver ions by the sulfite is much smaller than the rate of solution of the silver halide (see Section YI of this chapter). The writer has obtained physical development, however, with a solution of silver nitrate and sodium sulfite. A specially hardened gelatin film which was able to withstand the action of the solution at 70° for 40 minutes was used. The developing solution contained 1.7 g. silver nitrate and 13 g. sodium sulfite per liter. Fog formation was relatively high, as might be expected. 

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