| negative feedback | This occurs where the products of a process can act at an earlier stage in the process to inhibit their own formation. The term was first used widely in conjunction with electrical amplifiers where negative feedback was applied to limit distortion of the signal by the amplification mechanism. Tends to stabilise the process. In contrast to positive feedback. (18 Nov 1997) |
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| negative focal length | <physics> The focal length of a negative lens. Parallel rays impinging on a negative lens can be traced to a virtual focus which exists on the same side of the lens as the impinging rays. The distance from the second principal point of the lens to this second focal point is measured on the same side of the lens as is the object. See: negative lens, focal length. (05 Aug 1998) |
| negative G | Gravity in a foot-to-head direction in flying, or in standing on one's head; opposite of positive G. (05 Mar 2000) |
| negative image | Continuation of visual impression after cessation of stimuli causing the original image. (12 Dec 1998) |
| negative lens | <physics> A lens with a negative focal length. The edge of a negative lens is thicker than the centre. The three negative lenses are, according to their figure: planoconcave, double concave or biconcave, and diverging concavoconvex or diverging meniscus. See: lens, simple. (05 Aug 1998) |
| negative meniscus | A convexoconcave lens in which the power of the concavity exceeds that of the convexity. Synonym: negative meniscus. (05 Mar 2000) |
| negative phase | The period during which the opsonic index is lowered following the injection of a vaccine. (05 Mar 2000) |
| negative pressure | Pressure less than that of the ambient atmosphere. (05 Mar 2000) |
| negative regulation | Negative feedback in biological systems mediated by allosteric regulatory enzymes. (18 Nov 1997) |
| negative S | Characteristic sedimentation behaviour of a lipoprotein fraction of plasma in a centrifugal field in a medium of appropriate density, achieved by adding a salt or D2O to the plasma. Synonym: negative S, Svedberg of flotation. (05 Mar 2000) |
| negative scotoma | A scotoma that is not ordinarily perceived, but is detected only on examination of the visual field. (05 Mar 2000) |
| negative stain | <technique> Stain forming an opaque or coloured background against which the object to be demonstrated appears as a translucent or colourless area; in electron microscopy, an electron opaque material, such as phosphotungstic acid or sodium phosphotungstate, is used to give detail as to surface structure. (05 Mar 2000) |
| negative staining | Microscopic technique in which the object stands out against a dark background of stain. For electron microscopy the sample is suspended in a solution of an electron dense stain such as sodium phosphotungstate and then sprayed onto a support grid. The stain dries as structureless solid and fills all crevices in the sample. When examined in the electron microscope the sample appears as a light object against a dark background. Quite fine structural detail can be observed using negative staining and it has been used extensively to study the structure of viruses and other particulate samples. (18 Nov 1997) |
| negative strand virus | A virus the genome of which is a strand of RNA that is complementary to messenger RNA; negative strand virus's also carry RNA polymerases necessary for the synthesis of messenger RNA. (05 Mar 2000) |
| negative stranded RNA virus | <virology> Class V viruses that have an RNA genome that is complementary to the mRNA, the positive strand. They also carry the virus specific RNA polymerase necessary for the synthesis of the mRNA. Includes (Rhabdoviridae, Paramyxoviridae and Myoviridae (for example the T even phages). (18 Nov 1997) |
| negatron |
electron: an elementary particle with negative charge
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| negation |
a negative statement; a statement that is a refusal or denial of some other statement the speech act of negating (logic) a proposition that is true if and only if another proposition is false
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| negative |
characterized by or displaying negation or denial or opposition or resistance; having no positive features; "a negative outlook on life"; "a colorless negative personality"; "a negative evaluation"; "a negative reaction to an advertising campaign" having a negative electric charge; "electrons are negative" expressing or consisting of a negation or refusal or denial having the quality of something harmful or unpleasant; "ran a negative campaign"; "delinquents retarded by their negative outlook on life" not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative" reckoned in a direction opposite to that regarded as positive; "negative interest rates" less than zero; "a negative number" damaging: designed or tending to discredit, especially without positive or helpful suggestions; "negative criticism" a reply of denial; "he answered in the negative" a piece of photographic film showing an image with black and white tones reversed veto: vote against; refuse to endorse; refuse to assent; "The President vetoed the bill" minus: involving disadvantage or harm; "minus (or negative) factors"
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| negativism |
negativity: characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands
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| neglect |
disregard: lack of attention and due care the state of something that has been unused and neglected; "the house was in a terrible state of neglect" leave undone or leave out; "How could I miss that typo?"; "The workers on the conveyor belt miss one out of ten" fail: fail to do something; leave something undone; "She failed to notice that her child was no longer in his crib"; "The secretary failed to call the customer and the company lost the account" negligence: the trait of neglecting responsibilities and lacking concern fail to attend to; "he neglects his children" give little or no attention to; "Disregard the errors" negligence: failure to act with the prudence that a reasonable person would exercise under the same circumstances
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| neg | vote against |
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| neg | involving disadvantage or harm |
| neg | expressing or consisting of a negation or refusal or denial |
| neg | reckoned in a direction opposite to that regarded as positive |
| neg | designed or tending to discredit, especially without positive or helpful suggestions |
| neg | having the quality of something harmful or unpleasant |
| neg | characterized by or displaying negation or denial or opposition or resistance |
| neg | (mathematics) less than zero |
| neg | (medicine) not indicating the presence of microorganisms or disease or a specific condition |
| neg | having a negative electric charge |
| neg | having a surplus of electrons |
| neg | movement away from a chemical stimulus |