When does triple response occur?

In Arabidopsis the triple response is usually evaluated at 3 days post germination in seedlings grown in the dark in rich media supplemented with 10 μM of the ethylene precursor ACC in air or in unsupplemented media in the presence of 10 ppm ethylene.

Which Autacoid produces triple response on intradermal injection?

The triple response, a classic demonstration of histamine effect, is mediated mainly by H1 and H2 receptors. This response involves a small red spot at the center of an intradermal injection of histamine surrounded …

What is the flare response?

The wheal and flare response is a descriptor used when talking about a two stage allergic response seen in Type 1 hypersensitivity. The first stage, called the wheal, is controlled by substances called acute phase mediators. The second stage, called the flare, is controlled by substances called late phase mediators.

What are the triple signs of Lewis?

The triple response of Lewis is a cutaneous response that occurs from firm stroking of the skin. This produces an initial red line, followed by a flare around that line, and then finally a wheal.

How is the triple response of Lewis described?

Evolution of inflammatory processes in the three points described by Lewis. The triple response of Lewis is a cutaneous response that occurs from firm stroking of the skin, which produces an initial red line, followed by a flare around that line, and then finally a wheal.

What are the three aspects of the triple response?

The triple response consists of three aspects: 1 Red spot, caused by capillary vasodilation. 2 Flare, a redness in the surrounding area due to arteriolar dilation mediated by axon reflex. 3 Wheal, caused by exudation of extracellular fluid from capillaries and venules.

What is the hunting response of Lewis frostbite?

Hunting response of Lewis. The underlying pathophysiology of frostbite is a combination of freezing, vascular insufficiency (constriction and occlusion) and damage due to inflammatory mediators. As extremities cool, the ‘hunting response of Lewis’ (alternating vasoconstriction and vasodilation) occurs, ending with vasoconstriction.

What is the triple response of histamine injection?

Injected intradermally histamine elicits the triple response consisting of: Flare: redness in the surrounding area due to arteriolar dilatation mediated by axon reflex. The underlying pathophysiology of frostbite is a combination of freezing, vascular insufficiency (constriction and occlusion) and damage due to inflammatory mediators.