Rho
Rho (uppercase Ρ, lowercase ρ or ; el, ρο or el, ρω, label=none) is the 17th letter of the Greek alphabet. In the system of Greek numerals it has a value of 100. It is derived from Phoenician letter res . Its uppercase form uses the sa ...
(Ρ or ρ) is a letter of the Greek alphabet.
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Rho or RHO also may refer to:
Science and medicine
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Rho family of GTPases
The Rho family of GTPases is a family of small (~21 kDa) signaling G proteins, and is a subfamily of the Ras superfamily. The members of the Rho GTPase family have been shown to regulate many aspects of intracellular actin dynamics, and are found ...
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RHOA
Transforming protein RhoA, also known as Ras homolog family member A (RhoA), is a small GTPase protein in the Rho family of GTPases that in humans is encoded by the ''RHOA'' gene. While the effects of RhoA activity are not all well known, it is ...
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RHOB
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RhoC
RhoC (Ras homolog gene family, member C) is a small (~21 kDa) signaling G protein (more specifically a GTPase), and is a member of the Rac protein, Rac subfamily of the family Rho family of GTPases. It is encoded by the gene RHOC.
Mechanism and ...
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RHO (gene), or Rhodopsin
ρ as a conventional symbol
;in mathematics
* A length coordinate in coordinate systems with both length and angle coordinates:
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Polar coordinate system
In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point and an angle from a reference direction. The reference point (analogous to the or ...
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Spherical coordinate system
In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a point is specified by three numbers: the ''radial distance'' of that point from a fixed origin, its ''polar angle'' measu ...
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Cylindrical coordinate system
A cylindrical coordinate system is a three-dimensional coordinate system that specifies point positions by the distance from a chosen reference axis ''(axis L in the image opposite)'', the direction from the axis relative to a chosen reference di ...
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Toroidal coordinate system
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Toroidal and poloidal
Toroidal describes something which resembles or relates to a torus or toroid:
Mathematics
*Torus
*Toroid, a surface of revolution which resembles a torus
*Toroidal polyhedron
*Toroidal coordinates, a three-dimensional orthogonal coordinate system ...
coordinates of the Earth's magnetic field
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Spectral radius
In mathematics, the spectral radius of a square matrix is the maximum of the absolute values of its eigenvalues. More generally, the spectral radius of a bounded linear operator is the supremum of the absolute values of the elements of its spectru ...
of a square matrix
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Pollard's rho algorithm
Pollard's rho algorithm is an algorithm for integer factorization. It was invented by John Pollard in 1975. It uses only a small amount of space, and its expected running time is proportional to the square root of the smallest prime factor of the ...
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Pollard's rho algorithm for logarithms
Pollard's rho algorithm for logarithms is an algorithm introduced by John Pollard in 1978 to solve the discrete logarithm problem, analogous to Pollard's rho algorithm to solve the integer factorization problem.
The goal is to compute \gamma such ...
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Prime constant
The prime constant is the real number \rho whose nth binary digit is 1 if n is prime and 0 if n is composite or 1.
In other words, \rho is the number whose binary expansion corresponds to the indicator function of the set of prime numbers. Tha ...
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Plastic number
In mathematics, the plastic number (also known as the plastic constant, the plastic ratio, the minimal Pisot number, the platin number, Siegel's number or, in French, ) is a mathematical constant which is the unique real solution of the cubic ...
;in physics
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Density
Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematical ...
of a material
* Volume
charge density
In electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek letter ρ) is the quantity of charge per unit volume, measured in the SI system in co ...
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Resistivity
Electrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current. A low resistivity indicates a material that readily allows ...
of a material
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Rho meson
Rho (uppercase Ρ, lowercase ρ or ; el, ρο or el, ρω, label=none) is the 17th letter of the Greek alphabet. In the system of Greek numerals it has a value of 100. It is derived from Phoenician letter res . Its uppercase form uses the sa ...
;in biology
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Rho factor
A ρ factor (Rho factor) is a bacterial protein involved in the termination of transcription.
* Rho factor binds to the transcription terminator pause site, an exposed region of single stranded RNA (a stretch of 72 nucleotides) after the open rea ...
protein in RNA transcription termination
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Ecology
Ecology () is the study of the relationships between living organisms, including humans, and their physical environment. Ecology considers organisms at the individual, population, community, ecosystem, and biosphere level. Ecology overlaps wi ...
, population damping ratio where ρ = λ1 / , λ2, .
;in statistics
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Spearman's rank correlation coefficient
In statistics, Spearman's rank correlation coefficient or Spearman's ''ρ'', named after Charles Spearman and often denoted by the Greek letter \rho (rho) or as r_s, is a nonparametric measure of rank correlation ( statistical dependence between ...
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Pearson product-moment correlation coefficient
In statistics, the Pearson correlation coefficient (PCC, pronounced ) ― also known as Pearson's ''r'', the Pearson product-moment correlation coefficient (PPMCC), the bivariate correlation, or colloquially simply as the correlation coefficient ...
;in other fields
* The reaction constant in the
Hammett equation
The Hammett equation in organic chemistry describes a linear free-energy relationship relating reaction rates and equilibrium constants for many reactions involving benzoic acid derivatives with meta- and para-substituents to each other with jus ...
in chemistry
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Rho (finance)
In mathematical finance, the Greeks are the quantities representing the sensitivity of the price of derivatives such as options to a change in underlying parameters on which the value of an instrument or portfolio of financial instruments is depe ...
Toponyms
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Rho, Lombardy
Rho (; ; ) is a town and ''comune'' (municipality) in the Metropolitan City of Milan in the Italian region of Lombardy, located about northwest of Milan. The language spoken in Rho is Italian.
Geography
Rho is lapped by the river Olona and cro ...
, a town in Italy
* Rho Island, a.k.a.
Ro, Greece
* Rho River, tributary of the
Dora di Bardonecchia, Italy
Acronyms and abbreviations RHO
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Right-Hand Opponent, in contract bridge
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Red Hot Organization
Red Hot Organization (RHO) is a not-for-profit, 501(c) 3, international organization dedicated to fighting AIDS through pop culture.
Since its inception in 1989, over 400 artists, producers and directors have contributed to over 15 compilati ...
, HIV/AIDS-related charity
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Rhodes International Airport
Rhodes International Airport "Diagoras" (Greek: Διεθνής Αερολιμένας Ρόδου "Διαγόρας"), or Diagoras International Airport , is located on the West side of the island of Rhodes in Greece. The facility is located ju ...
, in Greeter using
People
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Giacomo Rho
Giacomo Rho (1593, Milan – 27 April 1638, Beijing) was an Italian Jesuit missionary in China. There he adopted the Chinese name Luo Yagu (羅雅谷), and was also known by his courtesy name Weishao (味韶).
Life
The son of a jurist, Rho ent ...
(1593-1638), Italian Jesuit missionary in China
See also
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Ro (disambiguation)
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