Precipitates tuberculation

Under the sludge considerable orange-red tuberculation corrosion deposits may develop. In cause-and-effect fashion, the tubercles grow cause fouling, permit under-deposit corrosion to persist, and generally act as a binding agent for carbonates, silicates, and other precipitates. 

Infections with Clostridium difficile, Pseudomonas aeruginosa, and Listeria monocytogenes (SEDA-22, 450 318) have occasionally been precipitated or aggravated by glucocorticoids, as has tuberculous peritonitis (SEDA-20, 377 319). 

Tuberculous patients lacking in liver N-acetyl transferase who are treated with isoniazid are likely to develop polyneuritis (39). An enzyme abnormality is also responsible for the precipitation of acute intermittent porphyria by the barbiturate drugs (40). Likewise, the rare hereditary resistance to coumarin anticoagulant drugs is thought to be due to an enzyme deficiency (41). 

Corrosion of an iron pipe under certain conditions can also manifest itself in the formation of "pits" and "tubercules" (Fig. 7-13). The OH produced by the cathodic reaction not only may precipitate Fe(OH)2react with bicarbonate ion (alkalinity) in the water to produce carbonate ion. In the locally high pH region around the cathode, both FeCOats) and calcium carbonate may precipitate... 

The iron and calcium precipitates together form the familiar knarled tubercules that surround the anodic areas where Fe + dissolves to form pits. However, under other conditions CaC03(s), and possibly iron precipitates, may form a thin protective coating over the metal surface. 

These peptones are usually sold in the form of very light amorphous powders, very hygroscopic, of a slight acrid and bitter flavor, and with an odor resembling that of spoiled broth. Soluble in water, they are incompletely precipitable by alcohol. These products are said to be easily assimilable, and accordingly are used in the diet of tuberculous, cancerous, and debilitated patients. According to the case, a dose of 5 to 50 g. of dry peptone is prescribed per day. We also use them in an associated... 

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