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it is conventional to use the helicity basis to simplify calculations (of cross sections, for example). In this basis, the spin is quantized along the
Helicity_basis
Projection of spin along the direction of momentum
In physics, helicity is the projection of the spin onto the direction of momentum. Mathematically, helicity is the sign of the projection of the spin
Helicity_(particle_physics)
Scientific study of life
fundamental themes: the cell as the basic unit of life, genes and heredity as the basis of inheritance, evolution as the driver of biological diversity, energy
Biology
Complex four-component spinor
/}-m.\end{aligned}}} Dirac equation Weyl equation Majorana equation Helicity basis Spin(1,3), the double cover of SO(1,3) by a spin group Jost, Jürgen
Plane-wave solutions to the Dirac equation
Plane-wave_solutions_to_the_Dirac_equation
1957 measurement of the neutrino helicity
Sunyar [de]. It was the first experiment to measure the helicity of the neutrino. The helicity or "handedness" of a particle is the projection of its spin
Goldhaber_experiment
Symmetry of physical laws under a charge-conjugation transformation
one has to equate negative helicity with negative energy, and thus the anti-particle with the particle of opposite helicity. To be clear, the σ {\displaystyle
C-symmetry
Relativistic wave equation describing massless fermions
Pauli's criticism. This was followed by the measurement of the neutrino's helicity in 1958. As experiments showed no signs of a neutrino mass, interest in
Weyl_equation
Elementary particle with extremely low mass
property of chirality that is closely related to helicity, and for practical purposes the same as the helicity of the ultra-relativistic neutrinos that can
Neutrino
Rotating circular machine part with teeth that mesh with another toothed part
straight-cut cousins as helical gears do to spur gears, such as lower noise and vibration. Simplified calculated bevel gears on the basis of an equivalent cylindrical
Gear
Flexible skeleton supported by fluid pressure
also persist in a hydrostatic organ. A non-helical hydrostatic skeleton structure is the functional basis of the mammalian penis, which fills the corpora
Hydrostatic_skeleton
Main protein structure of fibrous collagen
Kartha (13, 14) advanced a structure for the collagen triple helix on the basis of fiber diffraction data. It consists of a triple helix made of the repetitious
Collagen_helix
Free online crowdsourced encyclopedia
2024. Retrieved September 15, 2024. Ruprechter, Thorsten; Santos, Tiago; Helic, Denis (September 9, 2020). "Relating Wikipedia article quality to edit
Wikipedia
Structure formed by double-stranded molecules
by double-stranded molecules of nucleic acids such as DNA. The double-helical structure of a nucleic acid complex arises as a consequence of its secondary
Nucleic_acid_double_helix
Type of angular momentum in light
fundamentally prevent decomposition of the angular momentum of light. Helicity operators can be used as alternatives. Orbital angular momentum states
Orbital angular momentum of light
Orbital_angular_momentum_of_light
Caliber of ammunition
the World War II Soviet submachine guns 7.63×25mm Mauser, which was the basis for, and has nearly identical dimensions to, the Tokarev, but has different
7.62_mm_caliber
Arrangement of plasma formed into a toroidal shape
Others studied the use of spheromaks to inject helicity into tokamaks, eventually leading to the Helicity Injected Spherical Torus (HIST) device and similar
Spheromak
Exterior algebraic map taking tensors from p forms to n-p forms
to the use of the two-spinor language in modern physics such as spinor-helicity formalism or twistor theory. The Hodge star is conformally invariant on
Hodge_star_operator
Emerging technology field
magnetic helical nanorobot consists of at least two components - one being a helical body, and the other being a magnetic material. The helical body provides
Nanorobotics
1944 non-fiction science book by Erwin Schrödinger
the 1940s, this idea stimulated enthusiasm for discovering the chemical basis of genetic inheritance. Although the existence of some form of hereditary
What_Is_Life?
Medical condition
S2CID 32662671. Selkoe DJ, Podlisny MB (2002). "Deciphering the genetic basis of Alzheimer's disease". Annual Review of Genomics and Human Genetics. 3:
Tauopathy
Plasma confinement device
The Helically Symmetric Experiment (HSX, stylized as Helically Symmetric eXperiment), is an experimental plasma confinement device at the University of
Helically Symmetric Experiment
Helically_Symmetric_Experiment
British X-ray crystallographer (1920–1958)
for production of wartime devices such as gas masks. This work was the basis of Franklin's PhD thesis The physical chemistry of solid organic colloids
Rosalind_Franklin
Soviet aircraft machine gun
was used in the majority of Soviet fighters and bombers and served as the basis for the ShVAK cannon. ShKAS is a gas-operated aircraft machine gun; it has
ShKAS_machine_gun
flow Helen Quinn Helen T. Edwards Heliac Helically Symmetric Experiment Helicity (particle physics) Helicity basis Helicon (physics) Helicon discharge Helikon
Index_of_physics_articles_(H)
Pigmentation of human hair follicles
with gray or no hair face professional discrimination. The full genetic basis of hair color is complex and not fully understood. Regulatory DNA is believed
Human_hair_color
include the Apollo program. His landmark book A Man on the Moon served as the basis for the HBO miniseries From the Earth to the Moon, which dramatized the
Meanings of minor-planet names: 12001–13000
Meanings_of_minor-planet_names:_12001–13000
Method to detect presence of polysaccharides
blue-black. The interaction between starch and the triiodide anion (I− 3) is the basis for iodometry. The iodine–starch test was first described in 1814 by Jean-Jacques
Iodine–starch_test
quasiparticle. Alternatives to the Standard Higgs Model Chronon Chirality and helicity List of fictional elements, materials, isotopes and subatomic particles
List of hypothetical particles
List_of_hypothetical_particles
Monument by Gianlorenzo Bernini
legitimate successor officiating at the ceremonies. Four marble plinths form the basis of the columns that support the baldachin. The two outer sides of each plinth
St._Peter's_Baldachin
Former Roman Catholic church
being officially consecrated in 1878. Loretto Chapel was used on a daily basis by the students and nuns of Loretto Academy until the school closed in 1968
Loretto_Chapel
Scalar quantity, changing sign in mirrored coordinates
is mathematically defined, regardless of whether it exists physically. Helicity is the projection (dot product) of a spin pseudovector onto the direction
Pseudoscalar
Structural fibrous protein
proteins contain a central ~310 residue domain with four segments in α-helical conformation that are separated by three short linker segments predicted
Keratin
Glucose polymer used as energy store in plants
water or alcohol. It consists of two types of molecules: the linear and helical amylose and the branched amylopectin. Depending on the plant, starch generally
Starch
Equations of motion for viscous fluids
and are characterized by positive and negative helicity respectively. The solution with positive helicity is given by: u x = 4 2 3 3 U 0 [ sin ( k x −
Navier–Stokes_equations
8-speed automatic from 2008
fractions of both central gears of a planetary gearset Or with the value 1 As a basis For reliable And traceable Determination of the torque conversion ratio
ZF_8HP_transmission
Neurodegenerative disease caused by prions
gene for the prion protein can cause a misfolding of the dominantly alpha helical regions into beta pleated sheets. This change in conformation disables
Creutzfeldt–Jakob_disease
Theory of a quantum origin of consciousness
are based on oscillating dipoles forming superposed resonance rings in helical pathways throughout lattices of microtubules. The oscillations are either
Orchestrated objective reduction
Orchestrated_objective_reduction
Classification of irreducible representations of the Poincaré group
representations. The first is associated with mass-squared and the second with helicity or spin. The physically relevant representations may thus be classified
Wigner's_classification
and Francis Crick published a paper about the discovery of the double helical structure of the DNA molecule based on the discoveries made by Rosalind
History_of_molecular_biology
Propulsion system creating motion without propellant
microwave-cavity thrusters such as the EmDrive and Cannae drive, the helical engine, Mach-effect or MEGA drives, quantum drive claims, and the quantum
Reactionless_drive
Chemical compound
polymer containing 0.9% iodine, calculated on a weight-weight basis, within a helical matrix. Cadexomer iodine was developed in the early 1980s in Sweden
Cadexomer_iodine
Ammunition feeding device of a firearm
famed both for its use at the Battle of the Little Bighorn, and being the basis for the iconic Winchester lever-action repeating rifle, which is still in
Magazine_(firearms)
Formulas in differential geometry
T, N, and B, or collectively the Frenet–Serret basis (or TNB basis), together form an orthonormal basis that spans R 3 , {\displaystyle \mathbb {R} ^{3}
Frenet–Serret_formulas
English physicist and biologist (1916–2004)
Franklin, and Maurice Wilkins played crucial roles in deciphering the helical structure of the DNA molecule. Crick and Watson's paper in Nature in 1953
Francis_Crick
Italian polymath (1452–1519)
anything! He thinks of the end before the beginning!" There is no documentary basis for the frequently made claim that Leonardo was present at the meeting between
Leonardo_da_Vinci
Species of single-celled organism
molecular mechanism underlying L. olor's "cellular origami" appears to be a helical array of microtubules, presently unique among organisms, uncovered in 2024
Lacrymaria_olor
Motion of charged particles
particles, a phenomenon known as cyclotron resonance. This resonance is the basis for many scientific and engineering uses of cyclotron motion. In quantum
Cyclotron_motion
Protein in cow and sheep milk
This phenomena is suggested to indicate evolutionary selection for the helical intermediate, avoiding aggregation during the folding process. β-Lactoglobulin
Β-Lactoglobulin
Mechanism that converts motion, and forces, from rotational to linear
simple machines. The most common form consists of a cylindrical shaft with helical grooves or ridges called threads around the outside. The screw passes through
Screw_mechanism
1958 experiment in DNA replicatication
McElroy, William D.; Glass, Bentley (eds.). A Symposium on the Chemical Basis of Heredity. Johns Hopkins Pr. pp. 699–736. Meselson, M. & Stahl, F.W. (1958)
Meselson–Stahl_experiment
Set of values that describe the polarization state of electromagnetic radiation
figure shows how the signs of the Stokes parameters are determined by the helicity and the orientation of the semi-major axis of the polarization ellipse
Stokes_parameters
1953 scientific paper on DNA
implications of quantum physics. Delbruck's thinking about the physical basis of life stimulated Erwin Schrödinger to write What Is Life?. Schrödinger's
Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid
Molecular_Structure_of_Nucleic_Acids:_A_Structure_for_Deoxyribose_Nucleic_Acid
1982 Japanese initiative to develop advanced computers
the parallel database management system Kappa, the legal reasoning system HELIC-II, and the automated theorem prover MGTP, as well as bioinformatics applications
Fifth Generation Computer Systems
Fifth_Generation_Computer_Systems
Pathogenic type of misfolded protein
one disulfide bond, a molecular mass of 35–36 kDa and a mainly alpha-helical structure. Several topological forms exist; one cell surface form that
Prion
Type of radiation therapy
treatment delivery differ. Conventional linacs do not work on a slice-by-slice basis but typically have a large area beam which can also be resized and modulated
Tomotherapy
Groups of bacteria living symbiotically
flagellate or ciliate bacteria, and at least one species of helical Treponema bacteria that forms the basis of Mixotricha protists' locomotion. The concept of
Microbial_consortium
Assault rifle (SG-540, SG-543)
steel locking lugs. The bolt head is rotated by a control cam riding in a helical guide slot machined into the bolt carrier. When a shot is fired, propellant
SIG_SG_540
Canadian-American physician
These experiments paved the way for Watson and Crick's discovery of the helical structure of DNA, and thus the birth of modern genetics and molecular biology
Oswald_Avery
Force acting on charged particles in electric and magnetic fields
causes the particle to move along a curved trajectory, often circular or helical in form, depending on the directions of the fields. Variations on the force
Lorentz_force
French industrialist and Citroën car brand founder
automaker Citroën. He is also remembered for his application of double helical or herringbone gears. Born in Paris in 1878, André-Gustave Citroen was
André_Citroën
Base pairs in molecular genetics
those of standard Watson–Crick base pairs found in the classic double-helical structure of DNA. Although non-canonical pairs can occur in both DNA and
Non-canonical_base_pairing
Genus of azhdarchid pterosaurs from the Late Cretaceous
Langston's family agreed that he posthumously be considered a co-author due the basis of the work in the decades of research he dedicates to the subject. Also
Quetzalcoatlus
Water channel protein in cell membranes
permeability of the cell membrane. Aquaporins have six membrane-spanning α-helical domains with both carboxylic and amino terminals on the cytoplasmic side
Aquaporin
Digital audio tape format
digital audio tracks onto the same S-VHS tape used by consumer VCRs, and the basis of a series of multitrack recorders by Alesis. Although originally a tape-based
ADAT
Aggregates of tau protein known as a biomarker of Alzheimer's disease
microscope, these polymers of tau are seen to take two basic forms: paired helical filaments (PHFs) and straight filaments. These basic types of tau filaments
Neurofibrillary_tangle
Opening in the surface of an object
the top or the bottom of the embryo. Gramicidin A, a polypeptide with a helical shape, has been described as a portable hole. When it forms a dimer, it
Hole
American audio and video recorder and storage media company
company began developing video tape recorders, and later introduced the helical scan concept that made home video players possible. They also introduced
Ampex
1974 Soviet 5.45×39mm assault rifle
from a black, glass-filled polyamide. The AKS-74U was also used as the basis for several other unique weapons, including the bullpup OTs-14 Groza specialist
AK-74
Region within a prokaryotic cell containing genetic material
interactions are rare. The condensed and spatially organized DNA forms a helical ellipsoid that is radially confined in the cell. The 3D structure of the
Nucleoid
Planned fusion facility
produce at least 2000 megawatts (2 gigawatts) of fusion power on a continuous basis, and it should produce 25 times as much power as required for scientific
DEMOnstration_Power_Plant
Species of elementary particle
of flavour. The transformation from the former basis to the flavour-eigenstate/mass-eigenstate basis for quarks underlies the Cabibbo–Kobayashi–Maskawa
Flavour_(particle_physics)
Class of enzymes that unpack genetic material
double helix, separating the two hybridized nucleic acid strands (hence helic- + -ase), via the energy gained from ATP hydrolysis. There are many helicases
Helicase
25 mm rotary aircraft autocannon
attack helicopter.[citation needed] The Equalizer was also used as the basis for the Sea Vulcan 25, a turret mounted gun for naval ship self-defense
GAU-12_Equalizer
Type of rotorcraft
on the development of the VS-300, which over four iterations, became the basis for modern helicopters with a single main rotor and a single tail rotor
Helicopter
Four-dimensional analog of the octahedron
planes are completely orthogonal. The 16-cell constitutes an orthonormal basis for the choice of a 4-dimensional reference frame, because its vertices
16-cell
Receptor activated by peptide hormone GLP-1
regulates the biased signaling of the receptor while the transmembrane helical boundaries and extracellular surface are a trigger for biased agonism.
Glucagon-like peptide-1 receptor
Glucagon-like_peptide-1_receptor
Technology that records, stores, and reproduces sound
compression method first proposed by Nasir Ahmed in 1972, provided the basis for the modified discrete cosine transform (MDCT), which was developed by
Digital_audio
et al. (2012). "Excitation of Orbital Angular Momentum Resonances in Helically Twisted Photonic Crystal Fiber". Science. 337 (6093): 446–449. Bibcode:2012Sci
Comparison of EM simulation software
Comparison_of_EM_simulation_software
Sequence of DNA that determines traits in an organism
phylogenetic trees and the development of the molecular clock, which is the basis of all dating techniques using DNA sequences. These techniques are not confined
Gene
American subsidiary of automaker Stellantis
during the early 1960s. In July 1959, NASA chose the Redstone missile as the basis for the Mercury-Redstone Launch Vehicle to be used for suborbital test flights
Chrysler
Re-arrangement of viral components into solid crystal particles
encase its contents in a helical structure, much like the naturally occurring helical structure seen in DNA. This resultant helical structure is the case
Virus_crystallisation
Polarization state
shrimp. In these cases, the underlying mechanism is the molecular-level helicity of the chitinous cuticle. Two species of mantis shrimp have been reported
Circular_polarization
Chemical compound
preparation of blueprints. This light-catalyzed redox reaction once formed the basis of some photographic processes. However due to their insensitivity and ready
Potassium_ferrioxalate
Molecule that carries genetic information
into tight loops and other shapes. In all species it is composed of two helical chains, bound to each other by hydrogen bonds. The two chains are coiled
DNA
Mammalian protein found in Homo sapiens
atoms of iron. Each monomer consists of three domains: the protease, the helical, and the apical domains. The shape of a transferrin receptor resembles
Transferrin
German manufacturing company
terminal block under the product name Cage Clamp. This invention was also the basis for the company's subsequent product groups. The cage clamp has since become
WAGO_GmbH
Infectious agent that replicates in cells
envelope of lipids. The shapes of these virus particles range from simple helical and icosahedral forms to more complex structures. Most virus species have
Virus
Current British assault rifle, bullpup
2007, the upgrade package was subsequently rolled out on a more general basis from 2009 onwards. The L85A3 was first unveiled in prototype form in September
SA80
Form of electromagnetic radiation
photon as. Another practice is to distinguish X- and gamma radiation on the basis of wavelength (or, equivalently, frequency or photon energy), with radiation
X-ray
Elementary particle with negative charge
of the electron defines the property of elementary particles known as helicity. The electron has no known substructure. Nevertheless, in condensed matter
Electron
Infraorder of marine mammals
and seven baleen species. Many species of whales migrate on a latitudinal basis to move between seasonal habitats. For example, the gray whale migrates
Cetacean
Dam in Yiling District, Hubei, China
2 million yd3) of earth. The concrete dam wall is 181 m (594 ft) high above the rock basis. When the water level is at its maximum of 175 m (574 ft) above sea level
Three_Gorges_Dam
Type of spring
silk, glass, or quartz under tension, that is twisted about its axis. A helical torsion spring, is a metal rod or wire in the shape of a helix (coil) that
Torsion_spring
Theory of gravity in which the graviton has nonzero mass
fields split into two helicity-2 h μ ν {\displaystyle h_{\mu \nu }} , two helicity-1 A μ {\displaystyle A_{\mu }} and one helicity-0 π {\displaystyle
Massive_gravity
Geometric symmetry in living beings
side, and subsequent asymmetry. Much of the investigation of the genetic basis of symmetry breaking has been done on chick embryos. In chick embryos the
Symmetry_in_biology
French car brand of Stellantis
bought the patent for very little money, leading to the invention of double helical gears. The next year, he and his partners invested a significant portion
Citroën
Relative conformational uniformity of repeating units in a macromolecule
usually semicrystalline and generally (but not exclusively) crystallize in a helical configuration. In syndiotactic or syntactic macromolecules the substituents
Tacticity
Protein
Tropomyosin is a two-stranded alpha-helical, coiled coil protein found in many animal and fungal cells. In animals, it is an important component of the
Tropomyosin
2024 tropical cyclone tornado outbreak
to intense convection, MLCAPE at 1500 to 2000 J/kg, and storm relative helicity values soaring above 350 m2/s2 being forecasted, favoring the development
Hurricane Milton tornado outbreak
Hurricane_Milton_tornado_outbreak
Class of enzymes
proteins have three domains: an N-terminal EGF-like domain, a small 4-helical membrane anchor, and a core heme-peroxidase catalytic domain. Both form
Cyclooxygenase
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