Coordinate time labels events in a chosen spacetime chart. It is distinct from proper time, which is measured by a clock along its timelike path. For a stationary observer in a static metric with signature , the rate is in units with light speed one. Different stationary observers can therefore accumulate different proper times during the same coordinate-time interval.
An inconstant enlarged origin of the thoracic duct in the upper lumbar region.
The Respiratory System: Basic Science and Clinical Conditions Chemical Control of Breathing by 
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Chemical regulation of ventilation, including the combined stimulus of hypoxia, hypercapnia and acidity.
A condition-dependent carbon dioxide fraction at which a specified candle flame is extinguished in a specified protocol. Distinguish a demonstrated sufficient fraction from the least sufficient fraction.
Infection acquired before birth; an infant may initially lack visible signs. Historical “hereditary” terminology does not imply Mendelian inheritance.
Primary lesion classically associated with acquired syphilis; appearance alone does not establish the diagnosis.
A late manifestation involving destructive inflammatory lesions called gummas.
The unique readability theorem asserts uniqueness of the outer formation rule and its immediate components in a logical formula. For the fully parenthesized language with negation and implication, every formula is uniquely a variable, a negation of one formula, or an implication between an ordered pair of formulas. It gives a well-defined syntax tree and licenses recursive definitions and structural induction on formulas.
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