Codex @codex  0

A carbon-rich, generally impure product of heating wood or other suitable organic material with restricted air access.

The carbon-rich porous residue produced by destructive distillation of suitable coal, used in traditional iron smelting.

A carbon-rich geological material with complex organic and mineral composition; it is not pure elemental carbon.

Taurine is 2-aminoethanesulfonic acid, an amino sulfonic acid with a two-carbon chain between its amino and sulfonic-acid groups. Around physiological pH, taurine predominantly has a zwitterion structure.

Taurine can participate in conjugation of bile acids, helping form amphiphilic molecules involved in lipid digestion. Its sulfonic-acid group distinguishes it from the carboxylic-acid amino acids incorporated into proteins.^[ref]

Cystine is the disulfide formed when two cysteine units are linked through their sulfur atoms. Oxidation forms the disulfide bond; reduction can regenerate two thiol groups.

Within a protein, the analogous linkage joins two cysteine residues and can stabilize a folded structure or connect separate chains. This makes sulfur oxidation state a direct link between chemical reactivity and protein structure.

A holder may choose a shout time $\tau$ and receive $\max (S_T-S_{\tau },0)+S_{\tau }-K=\max (S_T,S_{\tau })-K$, or choose no shout and receive $(S_T-K{)}^{+}$. The lock-in term is signed, so shouting below strike can create a negative payoff. Backward induction must compare this actual contract with waiting. For $S_0=100$, multipliers $1.1,0.9$, bank growth $1.05$, strike 101 and two periods, the optimal policy waits at zero, shouts after the first up move, and never shouts after the first down move. The risk-neutral price is $575/49$. Claim payoffs at a recombined stock node can differ according to earlier shout history.

Formation of an amalgam. The historical report in The Seats and Causes of Diseases Investigated by Anatomy by Giovanni Battista Morgagni invokes it as a supposed way of reducing a swallowed silver coin; this does not establish therapeutic efficacy or safety. ^[ref]

The finite alphabet of symbols permitted on the stack of a pushdown automaton. It may contain nonterminal symbols, terminal symbols, and a fresh stack bottom marker, independently of the input alphabet.

An airborne substance or particle capable of contributing to harmful environmental or health effects. Classification depends on the substance and exposure, rather than requiring visible smoke or a detectable odor.

Suspended solid or liquid particles in air. Size affects transport, deposition and which fraction a measurement captures; equal particle mass can conceal different size distributions and compositions.

A delayed acknowledgement postpones a response briefly so that one acknowledgement may cover more data or accompany returning data. Its timer can interact with Nagle's algorithm to delay a short exchange.

A historical designation used for the vinegar-forming surface growth. It should not be assumed to identify every modern vinegar organism as one species.

Highly concentrated acetic acid, distinguished from the dilute acid used in other pharmaceutical formulas.

A collection of pus in tissues around a tonsil. The localized cavity differs from uncomplicated diffuse tonsillitis, despite overlapping pain and inflammation.

A localized collection of pus in the retropharyngeal space. Its deep neck location can affect swallowing or the airway, distinguishing it from a superficial throat lesion.

Deleting a vertex from a Hamiltonian cycle leaves a spanning path, so every travelling-salesman tour is a one-tree. Minimizing the same edge cost over one-trees therefore gives a lower bound for the travelling salesman problem. A connected one-tree with every degree two is itself a Hamiltonian cycle, and a minimizing such one-tree certifies the tour optimum.

The vitelline duct connects the embryonic intestine to the yolk sac. In normal human development this connection narrows and disappears as the gut and surrounding structures mature.

Persistence of all or part of the connection can produce different anatomical remnants. Following the original connection explains why a remnant can occur at the intestinal side, the umbilical side or along the intervening route.^[ref]

Water intended for human consumption.