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In molecular biology, the heat-labile enterotoxin family includes Escherichia coli heat-labile enterotoxin (Elt or LT) and cholera toxin (Ctx) secreted by Vibrio cholerae. lt is so named because it is inactivated at high temperatures.
Heat-stable enterotoxins (STs) are secretory peptides produced by some bacterial strains, such as enterotoxigenic Escherichia coli [2] which are in general toxic to animals. These peptides keep their 3D structure and remain active at temperatures as high as 100 °C.
An enterotoxin is a protein exotoxin released by a microorganism that targets the intestines. [1] They can be chromosomally or plasmid encoded. [ 2 ] They are heat labile (> 60 °C), of low molecular weight and water-soluble.
Enterotoxigenic Escherichia coli (ETEC) is a type of Escherichia coli and one of the leading bacterial causes of diarrhea in the developing world, [1] as well as the most common cause of travelers' diarrhea. [2]
In the field of molecular biology, enterotoxin type B, also known as Staphylococcal enterotoxin B (SEB), is an enterotoxin produced by the gram-positive bacteria Staphylococcus aureus. It is a common cause of food poisoning , with severe diarrhea , nausea and intestinal cramping often starting within a few hours of ingestion. [ 1 ]
The larger of the two proteins, LT enterotoxin, is similar to cholera toxin in structure and function. The smaller protein, ST enterotoxin causes cGMP accumulation in the target cells and a subsequent secretion of fluid and electrolytes into the intestinal lumen. ETEC strains are noninvasive, and they do not leave the intestinal lumen.
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Foods at high risks are those prepared in large quantities. Staphylococcus aureus is a true food poisoning organism. It produces a heat stable enterotoxin when allowed to grow for several hours in foods such as cream-filled baked goods, poultry meat, gravies, eggs, meat salads, puddings and vegetables. The toxins may be present in dangerous ...