| ANTR | apparent net transfer rate |
|---|---|
| NAE | net acid excretion |
| NAF | nafcillin; National Amputation Foundation; National Ataxia Foundation; net acid flux |
| NAI | net acid input; no accidental injury; no acute inflammation; nonadherence index |
| NDP | net dietary protein; nucleoside diphosphate |
| CNCPS | Cornell Net Carbohydrate and Protein System |
|---|---|
| NET | L-NE transporter |
| NET | Nerve Excitability Test |
| NPV | Net Present Value |
| NPC | Net Protein Catabolism |
| achromatic | <microscopy> Literally, colour-free. A lens or prism is said to be achromatic when corrected for two colours. The remaining colour seen in an image formed by such a lens is said to be secondary chromatic aberration. A truly achromatic lens would transmit light without decomposing it spectrally and there would be no colour fringing in the image. A doublet, composed of a positive and negative lens element, can be made achromatic for two colours which much improves the performance for most of the others. (05 Aug 1998) |
|---|---|
| achromatic aplanatic condenser | <microscopy> A well-corrected microscope condenser lens, corrected for chromatic and spherical aberrations and satisfying the sine condition. (05 Aug 1998) |
| achromatic apparatus | The nonstaining asters and spindle fibres in a dividing cell. (05 Mar 2000) |
| achromatic lens | A compound lens made of two or more lens's having different indices of refraction, so correlated as to minimise chromatic aberration. (05 Mar 2000) |
| achromatic objective | <microscopy> An objective that is corrected chromatic for two colours, and spherically for one, usually in the yellow-green part of the spectrum. (05 Aug 1998) |
| achromatic threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| achromatic vision | A severe congenital deficiency in colour perception, often associated with nystagmus and reduced visual acuity. Synonym: achromatic vision, monochromasia, monochromasy, monochromatism. Origin: G. A-priv. + chroma, colour, + opsis, vision (05 Mar 2000) |
| artificial neural net | Artificial Neural Nets (ANN) are computer models of biological nerve cell networks. (09 Oct 1997) |
| bag net | A bag-shaped net for catching fish. Source: Websters Dictionary (01 Mar 1998) |
| Chiari's net | Abnormal fibrous or lacelike strands in the right atrium, extending from the margins of the coronary or caval valves and attaching to the atrial wall along the line of the crista terminalis; results when resorption of the septum spurium is markedly less than normal. (05 Mar 2000) |
| chromidial net | A reticulum of basophilic-staining material in the cytoplasm of certain cells. (05 Mar 2000) |
| nerve net | A meshlike structure composed of interconnecting nerve cells that are separated at the synaptic junction or joined to one another by cytoplasmic processes. In invertebrates, for example, the nerve net allows nerve impulses to spread over a wide area of the net because synapses can pass information in any direction. (12 Dec 1998) |
| net | 1. To make into a net; to make n the style of network; as, to net silk. 2. To take in a net; to capture by stratagem or wile. "And now I am here, netted and in the toils." (Sir W. Scott) 3. To inclose or cover with a net; as, to net a tree. Origin: Netted; Netting. Source: Websters Dictionary (01 Mar 1998) |
| net flux | The difference between the two unidirectional flux's. (05 Mar 2000) |
| net heating value | The potential energy available in the fuel as received, taking into account the energy loss in evapourating and superheating the water in the sample. Expressed as NVH = (HHV x (1- MC / 100)) - (LH(2)O x MC / 100) (05 Dec 1998) |
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