Science and Medicine

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Entry Category: Science and Medicine - Starting with R

Rabies

Rabies, a viral disease that attacks the body’s central nervous system, causes convulsions, hallucinations, and an inability to swallow liquid—hence its earlier name, hydrophobia, or “fear of water.” Until Frenchman Louis Pasteur’s 1885 creation of a vaccine that successfully treated rabies in humans, the bite from a rabid animal almost always resulted in a death excruciating to endure and horrifying to witness. Pasteur’s discovery was publicized in Arkansas, but it would be almost thirty years before the state had a treatment center using his methods, though it lasted only briefly. Two months after Pasteur’s breakthrough, four New Jersey children who had been bitten by a rabid dog traveled to France and were cured using the vaccine. News of these boys’ …

Ranavirus

Ranaviruses are viral pathogens (double-stranded DNA viruses) that infect a broad diversity of at least 175 ectothermic (cold-blooded) vertebrates across the globe; they belong in the genus Ranavirus (RV) of the family Iridoviridae. The genus is composed of six recognized viral species, three of which—tiger salamander (Ambystoma tigrinum) virus (ATV), Bohle iridovirus (BIV), and the type species, frog virus 3 (FV3)—are known to infect amphibians. There are four additional genera of viruses within this family, but RV is the only one that includes viruses that are infectious not only to amphibians but also reptiles and wild and cultured teleost fishes. A study in 2016 found no occurrence of ranavirus in Arkansas in turtles of the eastern part of the state …

Razorback Hogs

Arkansas was known for its razorback hogs long before the University of Arkansas mascot came into being. These wild boars were called razorbacks because of their high, hair-covered backbone and ill-mannered temper. The razorback hog was considered ruthless and dangerous when backed into a corner. The true wild boar, also called the European or Russian boar, is not native to the United States. Christopher Columbus introduced their domesticated ancestors to the New World in 1493. Wild boars are thought to have arrived with explorer Hernando de Soto, who brought the original thirteen grunting hogs to the new world in 1539, though this theory has lately been cast into doubt by Charles Hudson, who reconstructs de Soto’s path in his book, …

Red-cockaded Woodpeckers

aka: Picoides borealis
With the exception of the recently rediscovered ivory-billed woodpecker, red-cockaded woodpeckers (Picoides borealis) are the rarest of Arkansas’s nesting woodpeckers. A century ago, the bird was common in mature, open pine stands. Its natural range included millions of acres of pine habitat throughout the southeast United States. An estimated ninety-nine percent of suitable habitat was lost because of logging, wildfire suppression, conversion to agricultural lands, and urbanization. Best estimates range-wide indicate an original population numbering over four million. By the time the bird was declared endangered, it had declined to an estimated 10,000. The Arkansas population dwindled to under 400 birds. The red-cockaded woodpecker was designated as endangered on October 13, 1970. It received formal legal protection with the passage …

Reed, Eddie

Eddie Reed was a cancer researcher, medical oncologist, and leader in public policy addressing disparities in healthcare in the United States. Reed is a member of the Arkansas Black Hall of Fame. Eddie Reed was born on December 17, 1953, the son of Floyd and Gennora Reed, who raised a family of eighteen children on a farm near Hughes (St. Francis County). Reed and his siblings received their early education in Hughes’s public schools, and all received a college education and had distinguished careers as lawyers, doctors, teachers, and public servants. Reed attended Philander Smith College, a historically black institution in Little Rock (Pulaski County), where he achieved academic distinction. In the summer following his sophomore year, he was chosen …

Reid, Thomas Jefferson

Thomas Jefferson Reid was a physician and a colonel in the Confederate army during the Civil War. Reid not only fought during the war—and at one point escaped from a prisoner-of-war camp—he also served at times in a medical role. After the war, he practiced medicine in Arkansas. He moved to Illinois around 1880, where he lived the rest of his life. Thomas Jefferson Reid was born on January 6, 1838, in Caswell County, North Carolina. He was one of twelve children born to Thomas Jefferson Reid and Frances Lightfoot Edwards “Fannie” Reid. Thomas Sr. was a descendant of Major John Reid of Virginia, who had served in the American Revolution. Reid’s mother was well educated and from a slaveholding …

Remmel Dam

aka: Lake Catherine
Remmel Dam is situated on the Ouachita River at Jones Mills (Hot Spring County). It was constructed in 1924 by Arkansas Power and Light (AP&L), now Entergy, in response to the growing demand for electrical power in southern Arkansas and surrounding states. The dam impounds Lake Catherine and, together with Carpenter Dam in Hot Springs (Garland County), provides hydroelectric power for southern Arkansas. Part of a three-dam project on the Ouachita River along with Carpenter Dam (completed in 1931) and Blakely Mountain Dam (completed in 1953), it played an important role in the early development of AP&L. In 1916, former riverboat captain Flave Carpenter met with Harvey Couch, who founded AP&L in 1913, to discuss the possibility of building dams on …

Reptiles

Arkansas’s reptilian biodiversity includes four groups—turtles, lizards, snakes, and the American alligator—each with a sharply different body morphology. By closely examining the morphology of these varied groups within the class Reptilia, today’s phylogenetic taxonomists (individuals who study the evolutionary relationships among species) have found that members of this class share several recently derived features (such as skull characteristics) with birds. Because of this modern understanding of the evolutionary relationships among reptilian ancestors and their descendents, which include dinosaurs and birds, some taxonomists have proposed a new class (Eureptilia) to include dinosaurs, birds, crocodylians, all of their close diapsid relatives (including lizards and snakes), and a number of extinct groups. However, the classical taxonomic designation for the class Reptilia includes turtles, …

Riddle’s Elephant and Wildlife Sanctuary

Opened in 1990 by Scott and Heidi Riddle, Riddle’s Elephant and Wildlife Sanctuary, located on 330 acres outside of Greenbrier (Faulkner County), provides a permanent home for African and Asian elephants in need of sanctuary for any reason, regardless of age, sex, species, health, or temperament. Elephants come from private owners, circuses, or zoos. The 501(c)(3) nonprofit sanctuary—which raises money through grants and donations—houses up to a dozen elephants at any given time, with three baby elephants born at the facility as of 2010. Maximus, an African elephant born at the sanctuary in 2003, starred in Animal Planet’s television show Growing Up Elephant. Scott and Heidi Riddle met while both were working at the Los Angeles Zoo, and they married …

Rivervale Inverted Siphons

Completed in 1926, the Rivervale Inverted Siphons were a prerequisite to permanent settlement in eastern Poinsett County and adjacent areas in the St. Francis River and Little River basins. The siphons provided relief from overflow and outlet for runoff from Craighead and Mississippi counties and portions of southeastern Missouri. One of the first components in the comprehensive drainage plan devised for Drainage District Number Seven of Poinsett County, the Rivervale Inverted Siphons also permitted the immediate agricultural development and economic exploitation of parts of Poinsett County and those counties in Missouri and Arkansas tributary to District Seven. They were also a necessary response to the proliferation of organized drainage and levee districts in the early twentieth century. The siphons were …

Robinson, John Marshall

John Marshall Robinson was a prominent physician, civic leader, and co-founder and president of the Arkansas Negro Democratic Association (ANDA). As a physician, Robinson performed pioneering medical surgery and was involved with a number of medical institutions and organizations in Little Rock (Pulaski County). As a politician, Robinson was the main voice in the state demanding equal black participation in the Arkansas Democratic Party between 1928 and 1952. Born on July 31, 1879, in Pickens, Mississippi, John Robinson was one of eight children of Isabell Marshall and Amos G. Robinson. Robinson attended Rust College in Holly Springs, Mississippi, and graduated from Meharry Medical College in Nashville, Tennessee, in 1904. While in Nashville, Robinson met and married India Cox. Robinson’s only …

Rock Island Bridge (Little Rock–North Little Rock)

aka: Choctaw Bridge
aka: Clinton Presidential Park Bridge
The Rock Island Bridge is a lift-span bridge crossing the Arkansas River between downtown Little Rock (Pulaski County) and North Little Rock (Pulaski County). One of six bridges linking the two downtowns, the Rock Island Bridge was originally constructed as a railroad bridge in 1899; it was converted to serve as a pedestrian bridge in 2011 to complement the William J. Clinton Presidential Center and Park. In late 1898, the Choctaw and Memphis Railroad was organized with the goal of establishing a railroad into the Indian Territory (modern-day Oklahoma). Congress passed legislation authorizing construction of a new bridge across the Arkansas River in January 1899, and the Little Rock Bridge Company formed that May to develop plans for constructing the …

Rocks and Minerals

There are three basic classes of rocks: igneous, metamorphic, and sedimentary. Igneous rocks are those that solidified from magma (molten rock). Metamorphic rocks are formed from pre-existing rocks in a solid state by heat, pressure, and/or chemical activity. Sedimentary rocks are made up of particles of sediment cemented together. In Arkansas, the overwhelming majority of surface and near-surface rocks are sedimentary rocks. There are a few igneous rocks and some very low-grade metamorphic rocks, but these occupy little area. Out of Arkansas’s total area of 53,179 square miles, only about fifteen square miles are composed of igneous rocks. In the Ozark Plateau and Ouachita Mountains, there are indications of some very low-grade metamorphic effects on the rocks in restricted areas, …

Rotifers

aka: Wheel Animals
The Phylum Rotifera (“wheel animals”) contains over 2,100 nominal taxa of microscopic and near microscopic species of unsegmented, bilaterally symmetrical pseudocoelomate invertebrates. They were originally named in 1696 by Anglican priest John Harris (1666–1719) and studied in 1703 by Antoine van Leeuwenhoek (1632–1723). Several surveys of Rotiferans have been done in Arkansas, although there is no summation of the species as of 2019. Because they are minute and mostly composed of soft bodies, rotifers are not commonly supported for fossilization. Their only hard parts, their jaws, are sometimes preserved in the fossil record, but their size makes detection challenging. However, fossils of Habrotrocha angusticollis have been found in Pleistocene (2.5 million to 11,700 years ago) peat deposits of Ontario, Canada. …

Roy, Frederick Hampton, Sr.

Frederick Hampton Roy Sr. was an ophthalmologist who lived and practiced in Little Rock (Pulaski County). He wrote many books on ophthalmology, some of which have been translated into other languages. Roy also authored books on topics such as history, architecture, and religion. In addition to being a prominent member of the Arkansas medical community, he was a prolific writer, a philanthropist, an advocate for historic preservation, and a politician. F. Hampton Roy was born in Nashville, Tennessee, on June 27, 1937. He graduated from Oak Ridge High School in Oak Ridge, Tennessee, in June 1955. After graduation, he entered the University of Tennessee at Knoxville and received a BS in 1958. In 1961, he received his MD from the …

Rubella

Rubella or “German measles” is a contagious disease caused by a virus of the genus rubivirus, which is identified as a member of either the family matonviridae or togaviridae. Present only in humans, the rubella virus is unrelated to the measles virus. The disease acquired the name German measles because it was first described by German physicians in the mid-eighteenth century. Typically a mild illness of childhood, rubella spreads from person to person through respiratory droplets, appearing following an incubation period of twelve to twenty-three days. Symptoms include a low-grade fever, enlarged lymph nodes, and a diffuse, fine, light-red rash. Recovery usually confers immunity. Rubella is most dangerous during pregnancy. Prenatal maternal rubella infection, particularly if it occurs during the …