All articles starting with R

Rhizopus oryzae

Rhizopus oryzae, synonym of Rhizopus arrhizus, is a Mucorales mold: the leading cause of mucormycosis worldwide and a GRAS industrial fungus producing lactic acid, fumaric acid, and lipases.

Rhizopus stolonifer, black bread mold (syn. R. nigricans), is a fast-growing Mucorales fungus causing soft rot of over 100 postharvest fruits; grows at 15–30°C, fails above 33°C, sporangia up to 275 μm.

Rhizosphere

Rhizosphere: the soil zone influenced by plant roots, coined by Lorenz Hiltner in 1904. Extends under 1 mm to about 10 mm; root exudates drive microbial activity, nutrient cycling, and rhizosphere engineering.

Rhizostoma pulmo

Rhizostoma pulmo, the barrel jellyfish (Macri, 1778), is a large Mediterranean and Black Sea scyphozoan with medium-severity stings; vinegar worsens its stings, seawater is advised, and warming lengthens its bloom season.

Sep 29, 2026

Rhizotomy

Rhizotomy, including endoscopic rhizotomy, is a procedure that cuts or lesions spinal nerve roots or their branches, most often to relieve chronic facet joint pain or reduce spasticity in cerebral palsy.

Rho

Rho (Ρ, ρ, ῥῶ), 17th Greek letter, from Phoenician resh (head), numeral value 100; uppercase looks like Latin P but distinct code point U+03A1; tailed ϱ U+03F1; symbol for density and correlation coefficient.

Rho Acceleration

Rho Acceleration is a New York-based investment manager that makes significant minority or control recapitalization investments in technology companies; it was formed out of Rho Capital Partners in 2016.

Rho Cassiopeiae

Rho Cassiopeiae (Rho Cas) is a yellow hypergiant star in the constellation Cassiopeia, among the most luminous naked-eye stars, known for recurrent eruptions that dim it by a full magnitude.

Rho Coronae Borealis

Rho Coronae Borealis, also cataloged as HD 143761, is a Sun-like G-type star about 56.8 light-years away in Corona Borealis that hosts one of the first discovered exoplanetary systems.

Rho GTPase-activating protein

Rho GTPase-activating proteins (RhoGAPs, ARHGAP family) are ~66 human proteins with a ~190-amino-acid catalytic domain and arginine finger that accelerate Rho GTPase GTP hydrolysis, terminating signaling; specificity comes from auxiliary domains.

Rho GTPase-activating protein domain

RhoGAP domain (BH domain), the ~150-190 amino acid catalytic module of Rho GTPase-activating proteins; uses a conserved arginine finger to accelerate Rho/Rac/Cdc42 GTP hydrolysis; 66 human members, intrinsically nonselective.

Rho Leonis

Rho Leonis (ρ Leo), also known as Shaomin, is a blue supergiant star of spectral type B1 Iab in the constellation Leo, about 2,900 light-years away and magnitude 3.85.

Rho meson

The rho meson (Ρ meson), usually written ρ(770), is the lightest vector meson of quantum chromodynamics, a broad resonance that decays almost entirely into two pions.

Rho Motion

Rho Motion is a London-based market research firm founded in 2018, known for monthly global EV sales assessments and acquired by Benchmark Mineral Intelligence in 2024.

Rho Ophiuchi cloud complex

Rho Ophiuchi is a nearby dark nebula in the constellation Ophiuchus, one of the closest star-forming regions to the Sun, hosting a young cluster of several hundred stars.

Rho-related GTP-binding protein RhoG

RhoG (RHOG, UniProt P84095) is a human 191-amino-acid RAC-subfamily Rho GTPase, ~70% identical to Rac1, regulating actin reorganization, macropinocytosis, leukocyte migration, and the ELMO-DOCK-Rac pathway.

Rho(D) immune globulin

Rho(D) immune globulin (RhoGAM, anti-D, RhIG) is a plasma-derived IgG anti-D injection preventing Rh immunization in Rh-negative people; 300 µg doses at 26–28 weeks and within 72 hours postpartum cut HDFN by about 95%.

RHOA

RHOA (Ras homolog family member A) encodes a small GTPase molecular switch regulating actin cytoskeleton, motility, and cytokinesis; mutated at hotspots Y42C, G17V, and E40Q in gastric cancer and T-cell lymphomas.

Rhoads Opera House fire

Rhoads Opera House fire, Boyertown, Pennsylvania, January 13, 1908: a stage kerosene fire during a church play killed about 170 people and led to Pennsylvania's 1909 fire safety law.

Rhod Gilbert

Rhod Gilbert (born 1968, Carmarthen) is a Welsh stand-up comedian and TV presenter known for angry routines, Work Experience, and his 2022 head and neck cancer documentary A Pain in the Neck.

Rhoda

Rhoda (1974–1978) is a CBS sitcom spin-off of The Mary Tyler Moore Show starring Valerie Harper as Rhoda Morgenstern in New York; its wedding episode drew over 50 million viewers, and it ended with a pioneering divorce storyline.

Rhoda and Bernard Sarnat International Prize in Mental Health

The Rhoda and Bernard Sarnat International Prize in Mental Health is an annual National Academy of Medicine award, established in 1992, recognizing achievement in improving mental health.

Rhodamine 123

Rhodamine 123 is a cell-permeant, cationic fluorescent dye of the rhodamine family that accumulates in mitochondria of living cells, used to measure mitochondrial membrane potential and ABCB1 efflux activity.

Rhodamine 6G

Rhodamine 6G, also known as Rhodamine 590, is a synthetic fluorescent xanthene dye used chiefly as the gain medium in dye lasers and as a fluorescence tracer.

Rhodamine B

Rhodamine B, also known as Basic Violet 10 or tetraethylrhodamine, is a synthetic xanthene dye introduced in 1887 and widely used as a fluorescent tracer and laser dye.

Oct 20, 2026

Rhodanese-like domain

Rhodanese-like domain (rhodanese homology domain, RHD): a ~120-residue protein module in all domains of life that transfers sulfane sulfur via a catalytic cysteine persulfide; found single, tandem, or fused, and related to Cdc25 phosphatases.

Rhode (brand)

Rhode (rhode skin) is Hailey Bieber's Los Angeles beauty brand, launched June 2022 with three skincare products and sold to e.l.f. Beauty in 2025 for $1 billion after reaching $212 million in net sales.

Rhode Island

Rhode Island, the Ocean State, is the smallest U.S. state (1,531 sq mi) and second densest, capital Providence, 13th state (1790), founded by Roger Williams under the 1663 Royal Charter.

Rhode Island Democratic Party

The Rhode Island Democratic Party is the state Democratic affiliate, run by a Democratic State Committee and a biennial convention, dominant in state government since the New Deal, with a semi-closed primary and a 2026 convention that endorsed no gubernatorial candidate.