| PA | alveolar pressure |
|---|---|
| PACO | mean alveolar gas volume |
| PACO2 | partial pressure of carbon dioxide in alveolar gas |
| PACP | pulmonary alveolar-capillary permeability; pulmonary artery counterpulsation |
| PAH | para-aminohippurate; phenylalanine hydrolase; polycyclic aromatic hydrocarbon; predicted adult heigh... |
| isosbestic point | <physics> In applied spectroscopy, a wavelength at which absorbance of two substances, one of which can be converted into the other, is the same. (05 Mar 2000) |
|---|---|
| occipital point | The most prominent posterior point on the occipital bone above the inion. (05 Mar 2000) |
| o-point | <physics> Place where the poloidal magnetic field vanishes in such a way that the nearby flux surfaces are elliptical, for example on the magnetic axis or at the centre of a magnetic island. (See also X-Point.) (09 Oct 1997) |
| end point | <chemistry> It is the completion point during a titration reaction where there are equal amounts of titrant and whatever is being titrated. It is usually evident by the first perceptible alteration of the colour of an added indicator. <immunology> It is the most dilute an antibody or antiserum solution can be while still detectably reacting with the antigen. <statistics> A category of data used to compare the outcome in different arms of a clinical trial. Common endpoints are severe toxicity, disease progression or fall in such surrogate markers as CD4 count, but sometimes death is used as an endpoint. (08 Mar 2000) |
| end-point measurement | Analytical measurement at the end of a chemical reaction, as opposed to making the measurement while the reaction proceeds. (05 Mar 2000) |
| end-point nystagmus | A jerky, physiologic nystagmus occurring in a normal individual when attempts are made to fixate a point at the limits of the field of fixation. Synonym: deviational nystagmus. (05 Mar 2000) |
| trigger point | A specific point or area where, if stimulated by touch, pain, or pressure, a painful response will be induced. Synonym: dolorogenic zone, trigger area, trigger zone. (05 Mar 2000) |
| triple point | The temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple point of water (273.16 K) is a fundamental fixed point in temperature scales. (05 Mar 2000) |
| equivalence point | In a precipitin reaction, the zone in which neither antibody nor antigen is in excess. See: precipitation. Synonym: equivalence point. (05 Mar 2000) |
| Trousseau's point | A painful point, in neuralgia, at the spinous process of the vertebra below which arises the offending nerve. Synonym: apophysary point, apophysial point. (05 Mar 2000) |
| exclamation point hair | <clinical sign> The type of dystrophic anagen hair found at margins of patches of alopecia areata. The bulb is absent. (21 Jun 2000) |
| J point | The point marking the end of the QRS complex and the beginning of the S or T wave in the electrocardiogram. Synonym: ST junction. (05 Mar 2000) |
| jugal point | A craniometric point at the union of the temporal and frontal processes of the zygomatic bone. Synonym: jugal point. (05 Mar 2000) |
| far point | That point in conjugate focus with the retina when the eye is not accommodating. Synonym: punctum remotum. (05 Mar 2000) |
| far point of convergence | The point to which the visual lines are directed when convergence is at rest. (05 Mar 2000) |