One governing the stability of an amplifier or system incorporating feedback. It demands that the Nyquist diagram shall not enclose the point X= -1, Y=0, where n//i=X+jY.

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## NYQUIST DIAGRAM

For a feedback amplifier or system, a plot in rectangular co-ordinates of the factor p//i for frequencies from zero dc to infinity, where /i is the gain without feedback and ft is the fraction of the output voltage superimposed by the feedback loop onto the amplifier input.

## NYQUIST LIMIT

Maximum rate of transmitting pulses through a system. If B is the effective bandwidth in Hz, then 2B is the maximum number of code elements per second bauds which can be received with certainty. ^ B is known as the Nyquist interval. The Nyquist rate effects the minimum sampling rate allowable for accurate recon

## NYQUIST NOISE THEOREM

One by which the thermal noise power P in a resistor at any frequency can be calculated from Boltzmann and Planck

## NYRIM

TN for a reaction injection moulding process using block polymers formed from caprolactam and polyethers, so type of thermoplastic elastomer Europe,

## NYSTAGMUS

An abnormal and involuntary movement of the eyeball seen as a flicking backwards and forwards when the eye is deviated. Adj nystagmoid.

## NYSTATIN

An anti-fungal antibiotic, produced by a strain of Streptomyces noursei. Used in treatment of moniliasis and candidiasis and as a fungicide in tissue culture preparations.

## NZB, NZW MICE

Inbred strains of mice which develop spontaneous auto-immune diseases, including anaemia, glomerulonephritis and a condition resembling systemic lupus erythematosus. There is evidence that there is an underlying viral aetiology.