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D METHOD

Method applied for solving linear differential equation with constant coefficients.

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D REGION

Variable and short sequence of amino acids in the heavy chain of immunoglobulin. It is named "D region" because it contributes to diversity of produced antibodies.

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D'ALEMBERT'S PRINCIPLE

Physical principle that states that external forces are in equilibrium with internal forces of a body in motion.

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D-CHANNEL

A channel used for out-of-band signaling and control functions that works as part of the integrated services digital network.

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D-LAYER

The lowest region or layer of absorbing ionization, 55-95 km above the Earth. It impedes short

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D-SLIDE VALVE

A simple form of slide-valve, in section like a letter D, sliding on a flat face in which ports are cut. See slide-valve.

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D-VALUE

The time required at a given temperature to reduce the micro-organism count to 10%.

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DACITE

A light gray volcanic rock composed of plagioclase and other crystalline minerals in glassy silica. It looks like a rhyolite.

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DACRON

Trade name for polyethylene terephthalate, a polyester fibre with tough and elastic properties.

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DACRYOCYSTITIS

Inflammation of the lacrimal sac which obstructs draining of tears into the nose.

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