A rare exception to the dominance of α-amino acids in biology is the β-amino acid beta alanine ( 3-aminopropanoic acid ), which is used in plants and microorganisms in the synthesis of pantothenic acid ( vitamin B < sub > 5 </ sub >), a component of coenzyme A.

The exception is very near absolute zero, where the density of adiabats drops sharply and they become rare ( see Nernst's theorem ).

... A rare exception to this tradition is the prophetess and judge Deborah, perhaps the Bible's greatest woman figure.

With some refinements ( and the rare exception of the Kingma system and other custom adapted fingering systems ), Western concert flutes typically conform to Boehm's design, known as the Boehm system.

There, the sandy dry lake bed soil was not enough to support large trees with the exception of a few species of oaks, forming a rare oak savanna.

Most countries do not have a separate state ensign, although the United Kingdom is a rare exception, in having a red ensign for civil use, a white ensign as its naval ensign, and a blue ensign for government non-military vessels.

Direct precipitation of sodium salts from aqueous solutions is rare, because sodium salts typically have a high affinity for water ; an exception is sodium bismuthate ( NaBiO < sub > 3 </ sub >).

A notable exception to the association of Lycanthropy and the Devil, comes from a rare and lesser known account of an 80-year-old man named Thiess.

In rare cases it is possible for the player to acquire new units to bolster his forces, although this is the exception rather than the rule.

During the baroque period, before the invention of the piano, keyboard concertos were comparatively rare, with the exception of the organ and some harpsichord concertos by Johann Sebastian Bach.

By 1830, piracy in the Gulf of Mexico became rare with the exception of slave traders, who were considered pirates.

For example hip hop artists almost always use stage names, whereas " classical " composers and performers virtually never do ( violinist Hahn-Bin, born in South Korea as Yoo Hanbin, being a rare exception ).

The exception is rare varieties of white cacao, in which the seeds remain white.

The Azores are also sprinkled with both alternating black sand and boulder-lined beaches, with only a rare exception is their a white sand beach ( such as on the island of Santa Maria in Almagreira.

Because black boxers with the exception of Johnson had been barred from fighting for the heavyweight championship because of racism, Johnson ’ s refusal to fight African-Americans offended the African-American community, since the opportunity to fight top white boxers was rare.

Almost all of the Bob Stewart, Heatter – Quigley, Hatos – Hall ( except for a large portion of Let's Make a Deal ), and pre-1980 Merv Griffin productions have been destroyed, with the exception of a few rare pilots and " cast aside " episodes.

That film presents a rare exception in which motorized vehicles were allowed on the island.

The kazoo is not often found in European classical music, a rare exception being David Bedford's With 100 Kazoos, a piece which emphasizes the simplicity of the instrument — rather than being played by trained musicians, kazoos are handed out to members of the audience, who accompany a professional instrumental ensemble.

Despite their name, rare earth elements ( with the exception of the radioactive promethium ) are relatively plentiful in the Earth's crust, with cerium being the 25th most abundant element at 68 parts per million ( similar to copper ).

The dendritic spine can, therefore, with rare exception ( see LTP ), act as an independent unit.

His impact on the nature of American prime time network television drama is considerable: prior to Hill Street Blues it was rare for American straight drama shows to have story arcs, i. e. several stories running over many episodes ( with the exception of prime time soap operas such as Dallas ).

The retractable hardtop convertible trades higher initial cost, mechanical complexity and, with rare exception, diminished trunk space – for increased acoustic insulation, durability and break-in protection similar to that of a fixed roof coupe.

Songs from Born to Run were performed live as early as mid-1974 and by 1975, all had made their way into Springsteen's shows and ( with the rare exception of " Meeting Across the River ") continued to be a regular staple of his concerts on subsequent tours through 2009.

But it was rare for such methods to be translated into Latin ( a manual on Geometry, the eleventh century Geomatria incerti auctoris is a rare exception ), and such techniques appear to have percolated only slowly into the rest of Europe.

The woman eyed the youth with the avidity a coin collector might display toward a rare doubloon which is not yet in his collection.

and the success of such an endeavor is, as suggested above, glaringly rare.

The book concerned with the Negro's role in an urban society is rare indeed ; ;

It is one of the rare public ventures here on which nearly everyone is agreed.

Self-criticism is a rare but needed commodity in Congress.

On those rare occasions when a faculty member on tenure is not meeting the standards of the institution, the president must also bear the ultimate burden of decision and action.

In the rare case where a corporation's only substantial asset, or its most important one, is a claim for refund, perhaps its transfer should not be permitted, whether the reorganization takes the form of a statutory merger or of the acquisition of assets for stock.

The inhibition of the enzyme by very low concentrations of lanthanum ion is probably the strongest known biological effect of rare earth salts.

He is still heir to the rare gifts of space and silence, if he chooses to be.

For that matter, Stan Musial is rare, possessing the disposition that enabled him to put out the same for seven managers, reserving his opinions, but not his effort.

Actually Johnny is a glib, garrulous guy, with a rare sense of humor.

Beadle is even that rare scientist who takes an interest in money matters ; ;

Another cue is having the same family name, especially if rare, and this has been found to increase helping behavior.

Relief in post-conviction is rare and is most often found in capital or violent felony cases.

Generally, there is no trial in an appellate court, only consideration of the record of the evidence presented to the trial court and all the pre-trial and trial court proceedings are reviewed — unless the appeal is by way of re-hearing, new evidence will usually only be considered on appeal in " very " rare instances, for example if that material evidence was unavailable to a party for some very significant reason such as prosecutorial misconduct.

German uses the tesseragraphs ( four letters ) " tsch " for the phoneme and " dsch " for, although the latter is rare.

An example is modern Greek which may write the phoneme in six different ways: ⟨ ι ⟩, ⟨ η ⟩, ⟨ υ ⟩, ⟨ ει ⟩, ⟨ οι ⟩, and ⟨ υι ⟩ ( although the last is rare ).

Phytomelan is not unique to Asparagales ( i. e. it is not a synapomorphy ) but it is common within the order and rare outside it.

Fossil evidence of the Asterales is rare and belongs to rather recent epochs, so the precise estimation of the order's age is quite difficult.