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Cosa (chi) è scavenger$72503$ - definizione
CHEMICAL ADDITIVE USED TO REMOVE OR DEACTIVATE IMPURITIES
Radical scavenger; Chemical scavenger
Scavenger receptor (immunology)
CELL SURFACE RECEPTORS THAT MEDIATE ENDOCYTIC UPTAKE OF MODIFIED LIPOPROTEINS
Receptors, scavenger; Scavenger receptors, class f; Scavenger receptors, class d; Scavenger receptors, class c; Scavenger receptors, class b; Scavenger receptors, class a; Scavenger receptors, class e; SR-A2
Scavenger receptors are a large and diverse superfamily of cell surface receptors. Its properties were first recorded in 1970 by Drs.
Scavenger (chemistry)
A scavenger in chemistry is a chemical substance added to a mixture in order to remove or de-activate impurities and unwanted reaction products, for example oxygen, to make sure that they will not cause any unfavorable reactions. Their use is wide-ranged:
Mule scavenger
Mule scavenging; Spinning mule scavenger; Cotton scavenger; Cotton scavenging; Cotton mill scavenger; Mill scavenger
Scavengers were employed in 18th and 19th century in cotton mills, predominantly in the UK and the United States, to clean and recoup the area underneath a spinning mule. The cotton wastage that gathered on the floor was seen as too valuable for the owners to leave and one of the simplest solutions was to employ young children to work under the machinery.
Wikipedia
Scavenger (chemistry)
A scavenger in chemistry is a chemical substance added to a mixture in order to remove or de-activate impurities and unwanted reaction products, for example oxygen, to make sure that they will not cause any unfavorable reactions. Their use is wide-ranged:
- In atmospheric chemistry, the most common scavenger is the hydroxyl radical, a short-lived radical produced photolytically in the atmosphere. It is the most important oxidant for carbon monoxide, methane and other hydrocarbons, sulfur dioxide, hydrogen sulfide, and most of other contaminants, removing them from the atmosphere.
- In molecular laser isotope separation, methane is used as a scavenger gas for fluorine atoms.
- Hydrazine and ascorbic acid are used as oxygen scavenger corrosion inhibitors.
- Tocopherol and naringenin are bioactive free radical scavengers that act as antioxidants; synthetic catalytic scavengers are their synthetic counterparts
- Organotin compounds are used in polymer manufacture as hydrochloric acid scavengers.
- Oxygen scavengers or oxygen absorbers are small sachets or self adhesive labels that are placed inside modified atmosphere packs to help extend product life (notably cooked meats) and help improve product appearance. They work by absorbing any oxygen left in the pack by oxidation of the iron powder contained in the sachet/label.
- Glutathione in the body scavenges oxidizing free radicals and peroxides and as a thiol nucleophile, attacks dangerous alkylating electrophiles, which may be exogenous toxins or produced in the course of metabolism (e.g. NAPQI from paracetamol).
