An example of a 4-stranded Antiparallel ( biochemistry ) | antiparallel β sheet fragment from a crystal structure of the enzyme catalase ( PDB file 1GWE at 0. 88Å resolution ).

b ) Edge-on view of the central two β strands in a, showing the righthanded twist and the pleat of Cαs and sidechains that alternately stick out in opposite directions from the sheet.

In the most common usage, β strand refers to a single continuous stretch of amino acids adopting an extended conformation and involved in backbone hydrogen bonds to at least one other strand ; by contrast, a β sheet refers to an assembly of at least two such β strands that are hydrogen-bonded ( or H-bonded ) to each other.

The first β sheet structure was proposed by William Astbury in the 1930s.

Alpha particles ( α ) are stopped by a sheet of paper while beta particles ( β ) are stopped by an aluminium plate.

Computer-generated 3-D representation of the zinc finger motif of proteins, consisting of an alpha helix | α helix and an antiparallel Beta sheet | β sheet.

Cartoon representation of the Cys2His2 zinc finger motif, consisting of an alpha helix | α helix and an antiparallel Beta sheet | β sheet.

A region of secondary structure that is not a α helix, a β sheet, or a recognizable turn is commonly referred to as a coil.

Each of the two discrete substrate-binding domains ( SBDs ) have an α / β topology with a central β-pleated sheet embedded in flanking α-helices.

The TBP is an unusual protein in that it binds to the minor groove and binds with a β sheet.

They are a bilobal structure with a β sheet comprising the N-terminal lobe and an α helix constituting the C-terminal lobe.

The N-terminus domain has an α / β hydrolase fold, which is a globular structure containing a central β sheet surrounded by α helices.

The C-terminus domain is a β sandwich formed by two β sheet layers, and resembles an elongated cylinder.

It consists of a central six-stranded β sheet, with five parallel strands and an antiparallel edge strand, surrounded by seven α helices.

The domain has a mixed α / β structure, with a six-stranded central β sheet, plus an additional α-helical subdomain that covers the presumed active site of the molecule.

The Koori people of Victoria also knew Altair as Bunjil, the Wedge-tailed Eagle, and β and γ Aquilae are his two wives the Black Swans.

A beta strand ( also β strand ) is a stretch of polypeptide chain typically 3 to 10 amino acids long with backbone in an almost fully extended conformation.

β Capricorni is a double star also known as Dabih.

The members of this family also coassemble with auxiliary β subunits, each spanning the membrane once.

These two polymorphs differ by a " kinking " of bonds ; this change in structure gives β-quartz greater symmetry than α-quartz, and they are thus also called high quartz ( β ) and low quartz ( α ).

I. e., not only and must be substituted by α and β, respectively ( the first entity means " spin up ", the second one " spin down "), but also the sign + by the − sign, and finally r < sub > i </ sub > by the discrete values s < sub > i </ sub > (= ± ½ ); thereby we have and.

Methadone also acted as a potent, noncompetitive α < sub > 3 </ sub > β < sub > 4 </ sub > neuronal nicotinic acetylcholine receptor antagonist in rat receptors, expressed in human embryonic kidney cell lines.

Particle detectors can also be used to detect the emission of alpha ( α ) and beta ( β ) particles which often accompany the emission of a gamma photon but are less favourable, as these particles are only emitted from the surface of the sample and are often absorbed or attenuated by atmospheric gases requiring expensive vacuum conditions to be effectively detected.

Each catalytic β subunit also possesses a conserved lysine residue required for proteolysis.

* α Sge: also known as Sham, this yellow bright giant star of spectral class G1 II ( with 4. 37m ) lies at a distance of 610 light-years and together with β Sge ( also 4. 37m ) forms either the feathers of the shaft or the two-pointed arrow once used in the Roman army.

Suppose that whenever P ( β ) is true for all β < α, then P ( α ) is also true ( including the case that P ( 0 ) is true given the vacuously true statement that P ( α ) is true for all ).

NTC thermistors can also be characterised with the B ( or β ) parameter equation, which is essentially the Steinhart Hart equation with, and,

The stars Merak ( β Ursae Majoris ) and Dubhe ( α Ursae Majoris ) are known as the " pointer stars " because they are helpful for finding Polaris, also known as the North Star.

In a notation " β-th element " where β can also be an infinite ordinal, it will typically count from zero.

A recent study suggests mosquito saliva can also decrease expression of interferon − α / β during early mosquito-borne virus infection.

Unstable atomic nuclei with an excess of protons may undergo β < sup >+</ sup > decay, also called positron decay, where a proton is converted into a neutron, a positron and an electron-type neutrino:

2 ) Imparisyllabiques β ) Mots en .</ ref > > French trouvère / Occitan trobaire ( subject case ) and > Old French troveor, troveeur « trouveur » / Occitan trobador « troubadour » ( oblique case ) ( see also > OF peschiere / Occitan pescaire and > OF pescheeur, F pêcheur / Occitan pescador ).

The value of the gain at f < sub > 180 </ sub > also does not change with a change in β.

The model takes into account the asset's sensitivity to non-diversifiable risk ( also known as systematic risk or market risk ), often represented by the quantity beta ( β ) in the financial industry, as well as the expected return of the market and the expected return of a theoretical risk-free asset.

Two works by Xenocrates on Physics are mentioned ( περὶ φύσεως ϛ ΄-φυσικῆς ἀκροάσεως ϛ ΄), as are also books On the Gods ( περὶ Θεῶν β ΄), On the Existent ( περὶ τοῦ ὄντος ), On the One ( περὶ τοῦ ἑνός ), On the Indefinite ( περὶ τοῦ ἀορίστου ), On the Soul ( περὶ ψυχῆς ), On the Emotions ( περὶ τῶν παθῶν α ΄) On Memory ( περὶ μνήμης ), etc.

Note also that if there are conditions where β A < sub > OL </ sub > = − 1, the amplifier has infinite amplification – it has become an oscillator, and the system is unstable.

It contains the famous variable star Algol ( β Per ), and is also the location of the radiant of the annual Perseids meteor shower.

In some amino acids, the amine group is attached to the β or γ-carbon, and these are therefore referred to as beta or gamma amino acids.

* β Apodis is an orange giant 158 light years away, with a magnitude of 4. 2.

In Chinese, the asterism consisting of α, β, and γ Aquilae is known as (, ).

It contains both α and β ' phase ; the β '- phase is body-centered cubic and is harder and stronger than α. Alpha-beta brasses are usually worked hot.

The Boltzmann distribution is often expressed in terms of β = 1 / kT where β is referred to as thermodynamic beta.

The structure of a Streptomyces β lactamase is given by.

* Convex cone, a subset C of a vector space V is a convex cone if αx + βy belongs to C, for any positive scalars α, β, and any x, y in C

The alternative form, in which the CH < sub > 2 </ sub > OH substituent and the anomeric hydroxyl are on the same side ( cis ) of the plane of the ring, is called the β anomer.

where A ∈ N ( i. e., A is a single nonterminal ), α, β ∈ ( N U Σ )* ( i. e., α and β are strings of nonterminals and terminals ) and γ ∈ ( N U Σ )< sup >+</ sup > ( i. e., γ is a nonempty string of nonterminals and terminals ).

The name context-sensitive is explained by the α and β that form the context of A and determine whether A can be replaced with γ or not.

However, unlike peptidoglycan, the sugar N-acetylmuramic acid is replaced by N-acetyltalosaminuronic acid, and the two sugars are bonded with a β, 1-3 glycosidic linkage instead of β, 1-4.

In Samoa the constellation is called Sumu (" triggerfish ") because of its rhomboid shape, while α and β Centauri are called Luatagata ( Two Men ), just as they are in Tonga.