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Physical world and mathematics

42,772 articles

Myanmar units of measurement

Myanmar units of measurement, also called the Burmese system, are traditional units used daily in Myanmar, including the viss of about 1.63 kg for market weight.

Mycielskian

The Mycielskian of a graph G, also called a Mycielski graph, is a construction from 1955 that raises the chromatic number by one while preserving the clique number.

Mycosporine-like amino acid

Mycosporine-like amino acids (MAAs) are small, water-soluble UV-absorbing compounds synthesized by cyanobacteria, fungi, and algae, accumulated by aquatic animals through diet, and studied as biocompatible sunscreen ingredients.

Mykhailo Kravchuk

Mykhailo Kravchuk, also transliterated Krawtchouk, was a Ukrainian mathematician who introduced the Kravchuk polynomials in 1929, was arrested in 1938, and died in a Kolyma labor camp in 1942.

Mykola Pylchykov

Mykola Pylchykov (Микола Пильчиков, 1857–1908) was a Ukrainian experimental physicist known for the improved Pulyui X-ray tube and an 1898 public demonstration of radio control.

Myles Allen

Myles Allen is a British climate physicist and Professor of Geosystem Science at Oxford, called "the physicist behind net zero" for his carbon budget work.

Myles Tierney

Myles Tierney (1937–2017) was an American mathematician who, with F. William Lawvere, introduced elementary topos theory and the Lawvere–Tierney topology, and taught at Rutgers University.

Mylonite

Mylonite is a fine-grained, cohesive, foliated fault rock formed by ductile deformation in shear zones, coined by Charles Lapworth in 1885 along Scotland's Moine Thrust.

Myongsoo Lee

Myongsoo Lee (이명수) is a South Korean supramolecular chemist who studies self-assembling nanostructures from aromatic amphiphiles, and has been a professor at Fudan University in Shanghai since 2019, after posts at Yonsei and Seoul National University.

Myrcene

Myrcene, in practice β-myrcene, is an acyclic monoterpene hydrocarbon making up much of the essential oils of hops, cannabis, lemongrass, and citrus, used as a flavoring agent.

Myriad

A myriad is, precisely, the number ten thousand, the largest number named by one word in ancient Greek; in modern English it loosely means an indefinitely great number.

Myriam Sarachik

Myriam Sarachik (1933–2021) was an American experimental condensed-matter physicist at the City College of New York, known for confirming the Kondo effect and pioneering studies of molecular nanomagnets.

Myristic acid

Myristic acid, also known as tetradecanoic acid, is a 14-carbon saturated fatty acid abundant in coconut, palm, and nutmeg oils and used to make soaps, cosmetics, and flavorings.

Myristicin

Myristicin, also called methoxysafrole, is a naturally occurring allylbenzene in nutmeg, mace, parsley, and dill, best known as the major aromatic constituent of nutmeg oil.

Myron L. Bender

Myron L. Bender (Myron Lee Bender, 1924–1988) was an American bioorganic chemist who spent most of his career at Northwestern University and was elected to the National Academy of Sciences in 1968.

Myron Mathisson

Myron Mathisson (1897–1940) was a Polish physicist who derived the Mathisson–Papapetrou equations for spinning bodies in general relativity and proved a special case of Hadamard's conjecture.

Myung‐Hwan Whangbo

Myung-Hwan Whangbo, also published as M.-H. Whangbo, is an American theoretical and computational chemist at North Carolina State University known for band structures of low-dimensional solids and spin exchange analysis.

N = 32 shell closure

The N = 32 shell closure is a neutron subshell gap in neutron-rich nuclei near calcium, a new magic number absent in stable nuclei, most clearly established in calcium-52.

N = 34 magic number

The N = 34 magic number is a neutron shell closure, absent in stable nuclei, predicted for calcium-54 in 2001 and confirmed experimentally at RIKEN's beam factory in 2013.

N acetyl thiazolidin 4 carboxylic acid

N acetyl thiazolidin 4 carboxylic acid (NATCA), also known as N-acetylthioproline, is a synthetic sulfur-containing amino acid derivative used in agriculture as a plant biostimulant.

n_TOF

n_TOF, or Neutron Time Of Flight, is a pulsed neutron time-of-flight facility at CERN, operating since 2001, studying neutron-nucleus interactions from meV to GeV energies.

N-Acetyl-D-Galactosamine

N-Acetyl-D-Galactosamine, known as GalNAc, is an amino sugar derived from galactose that occurs in humans and E. coli, initiates mucin-type O-glycosylation, and delivers siRNA drugs to hepatocytes.

N-Acetyl-L-Aspartic Acid

N-Acetyl-L-aspartic acid (NAA) is an acetylated derivative of L-aspartate, abundant in the vertebrate brain and used as a marker of neuronal health on magnetic resonance spectroscopy.

N-Acetyl-Neuraminic Acid

N-Acetylneuraminic acid, also called NANA or sialic acid, is a nine-carbon sugar that caps cell-surface glycans in vertebrates and mediates viral attachment and immune signaling.

N-Acetylglucosamine

N-Acetylglucosamine (GlcNAc) is an amino sugar derivative of glucose that forms the polymer chitin in fungal cell walls and arthropod exoskeletons and occurs in bacterial peptidoglycan and mammalian glycoproteins.

N-Acyl homoserine lactone

N-Acyl homoserine lactones (AHLs) are small bacterial signaling molecules, each a homoserine lactone ring with an acyl side chain, that Gram-negative bacteria use for quorum sensing to regulate biofilms, virulence, and bioluminescence.

n-Amyl alcohol

n-Amyl alcohol, also called 1-pentanol or n-pentyl alcohol, is a straight-chain five-carbon primary alcohol, a colorless flammable liquid with a fusel-like odor used as a solvent and intermediate.

N-BK7

N-BK7 is a borosilicate crown optical glass made by SCHOTT AG and widely used for visible and near-infrared lenses, prisms, and windows; its refractive index is 1.51680.

N-body problem

The N-body problem, also called N-body mechanics, is the problem of predicting the motion of N particles interacting through gravity, solvable analytically only for up to two bodies.

N-body simulation

An N-body simulation is a numerical calculation of many bodies interacting through gravity, the standard astrophysical tool for problems from planetary orbits to cosmic structure formation.