Science and Medicine

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Entry Category: Science and Medicine

Cestodes

aka: Tapeworms
Cestodes (tapeworms) include flatworms belonging to the phylum Platyhelminthes, class Cestoidea, subclasses Cestodaria (two orders) and Eucestoda (sixteen orders), and about fifty-nine families. The subclass Cestodaria includes monozoic (unsegmented) tapeworms containing only a single set of male and female reproductive organs; these are parasitic in the intestinal tract and body cavity of fishes and turtles. The subclass Eucestoda is made up of polyzoic (segmented) or monozoic cestodes of varying structure and parasitic in the intestines of vertebrates. To date, there are more than 5,000 described species that, as endoparasites, infect all vertebrate classes. The classification of tapeworms remains ambiguous using classical morphological studies alone, and, although some studies have been done recently using molecular tools, further attention is needed to …

Chandler, Florence Clyde

Florence Clyde Chandler was a plant geneticist with a broad background in tree-breeding and the induction of polyploidy (the quality of having one or more extra sets of chromosomes) in flowering plants. Her exceptional success inducing polyploidy in the nuclei by using colchicines resulted in the production of a series of outstanding tetraploid and diploid verbenas. During World War II, she worked at the Guatemalan experimental station as a cinchona (a type of evergreen tree) breeder, where she furthered the successful development of a derivative for quinine, a malaria remedy. Born on September 28, 1901, in Oliver (Scott County) to William Festus Chandler and Nannie Charlotte Shannon, Florence Chandler was educated at the University of Arkansas (UA) in Fayetteville (Washington …

Cholera

Cholera, a deadly, infectious gastrointestinal disease that usually spreads through contaminated water, is an acute infection of the small intestine caused by the toxin released by the Vibrio cholerae bacteria, leading to severe diarrhea and dehydration. Left untreated, cholera can be fatal in a matter of hours. The first cholera pandemic of 1817–1823 spread from India to Southeast Asia, Central Asia, the Middle East, Russia, and Europe, especially England. Cholera was prevalent in the 1800s in America beginning in New York City. Due to increased traveling, the use of steamboats, and more navigable waterways, cholera made its way to the Mississippi Delta region. In October 1832, cholera reached Arkansas. An infected passenger boarded the steamboat Volant, captained by Charles Kelley. …

Chordate Parasites

aka: Parasitic Chordates
Although the majority of the world’s parasites are protists, helminths, invertebrates, and other miscellaneous groups of organisms, parasitism has also arisen within animals of the phylum Chordata (subphylum Vertebrata). All chordates, at some time in their development, possess five derived morphological characteristics as follows: (1) a dorsal tubular or hollow nerve cord, (2) a notochord, (3) pharyngeal gill slits or pouches, (4) an endostyle, and (5) a post-anal tail. Some examples of parasitic chordates are remoras (which attach to sharks and rays); the jawless fishes (lampreys and hagfishes), which prey upon other fishes; some birds that practice brood parasitism; and vampire bats. The Superclass Agnatha has both extinct groups and extant species, including the “jawless” fish (lamprey and hagfish) that …

Chowning, Frank Edwin

Frank Chowning was a longtime Little Rock (Pulaski County) attorney. He was also a plant enthusiast whose work with irises, especially his hybridization efforts, earned him an international reputation. Francis Edwin Chowning was born on May 26, 1894, in Rison (Cleveland County) to Nathaniel Barnett Chowning and Deborah Curtis Marks Chowning. Chowning grew up and received his early education in Rison before attending Henderson-Brown College (now Henderson State University) in Arkadelphia (Clark County). His time at Henderson-Brown was interrupted by World War I, during which Chowning served in the U.S. Army, earning the rank of lieutenant while stationed in France. Following the war, he earned his law degree from Vanderbilt University in 1922. He married Martha Speakes Bradford in 1928, …

Chytrid Fungus

Chytrid (pronounced “kit-rid”) fungus belongs to the Kingdom Fungi, Phylum Chytridiomycota, Class Chytridiomycetes, and Order Rhizophydiales, a division of zoosporic organisms. The fungus causes the disease chytridiomycosis, originally generated by Batrachochytrium dendrobatidis (Bd). An amphibian chytrid (discovered in 1998)—which causes an infection of the skin, with an affinity to frogs and toads—is present on every amphibian-inhabited continent. Further, broad lineage and genotypic variation have been found in B. dendrobatidis. The disease has resulted in a serious decline and extinction of more than 200 species of amphibians worldwide and poses the greatest threat to biodiversity of any known disease. By 2021, the fungus had pushed the regression of at least 501 amphibian species, or about one out of every 16 (6.3 …

Civil War Medicine

Medical treatment during the Civil War focused on two major areas: disease and wound care. As many as 700,000 members of the military lost their lives during the war, and approximately two-thirds of these deaths were due to disease. These figures do not include deaths suffered by the civilian population. Diseases were common before the war, especially yellow fever, cholera, and typhoid, but the war magnified their effect and sometimes brought them to epidemic proportions. The outbreak of war led to a massive mobilization effort in the state. Thousands of men joined military units and moved into camps with limited sanitary facilities. This lack of clean water, coupled with the large numbers of men living in close proximity, led to …

Cladocerans

aka: Water Fleas
Water fleas (cladocerans) belong to the Phylum Arthropoda, Subphylum Crustacea, Class Branchiopoda, and Order Cladocera. Over 700 species and more than 100 genera have been recognized, but many additional species are surely undescribed. The genus Daphnia alone contains around 150 species. The order forms a monophyletic group, which is divided into four suborders and eleven families as follows: Anomopoda (five families), Ctenopoda (two families), Haplopoda (one family), and Onychopoda (three families). Although a complete survey of the cladocerans of Arkansas has not been given, about twenty species/taxa within five families have been reported. Cladocerans first appeared in the Permian. Until recently, the evolutionary history of cladocerans has been obscured by a mixture of erroneous fossil identifications and assumptions. However, knowledge …

Clark, Mamie Katherine Phipps

Hot Springs (Garland County) native Mamie Phipps Clark was the first African American woman to earn a Doctor of Philosophy degree in psychology from Columbia University. The research she did with her husband was important in the success of the 1954 case Brown v. Board of Education of Topeka, Kansas, in which the United States Supreme Court declared the segregation doctrine of “separate but equal” with regard to education to be unconstitutional on account of such separation generating “a feeling of inferiority as to their status in the community” on the part of Black students. Mamie Phipps was born on October 18, 1917, in Hot Springs to British West Indies native Harold H. Phipps, a physician, and Kate Florence Phipps, …

Clegg, Moses Tran

Bacteriologist Moses Tran Clegg attracted international attention in 1909 when he reportedly became the first person to grow the leprosy bacillus in a laboratory. It was hoped that this breakthrough would lead to a vaccine to treat leprosy, also called Hansen’s disease, an infectious, disfiguring, and incurable disease caused by the bacillus Mycobacterium leprae. In addition to this achievement, Clegg also did research for the U.S. government on bubonic plague, amoebic dysentery, infantile paralysis, and cholera, and he coauthored scholarly bulletins on such bacteriological subjects as leprosy, amoebas, and parasitic protozoa. Born on September 1, 1876, in Red Bluff (Jefferson County) to Joseph T. Clegg, who was an allopathic doctor, and Ida Daugherty Clegg, Moses Clegg received his primary education …

Climate and Weather

Officially classified by climatologist Wladimir Köppen as having a humid sub-tropical climate, Arkansas is indeed humid, but numerous weather extremes run through the state. Humid sub-tropical is classified generally as a mild climate with a hot summer and no specific dry season. The Köppen classification is correct in that regard, but the state truly has four seasons, and they can all range from fairly mild to incredibly extreme. The topography of the land and its proximity to the plains to the west and the Gulf of Mexico to the south play a crucial role in its climate and weather. In the United States, warm, moist air travels into the plains from the Gulf of Mexico and interacts with cool, dry …

Climate Change

aka: Global Warming
The spring of 2019 brought record flooding along the Arkansas River from Van Buren (Crawford County) to its confluence with the Mississippi River in the east. Historic crests occurred at Dardanelle (Yell County), Morrilton (Conway County), Toad Suck Lock and Dam near Conway (Faulkner County), and Pendleton (Desha County) between May 30 and June 6. In July 2019, the National Weather Service reported that the remnants of Hurricane Barry dumped 16.17 inches of rain on Dierks (Howard County), the most rain ever measured in a twenty-four-hour period (1:00 p.m. July 15 through 1:00 p.m. July 16) in Arkansas; the three-day total of 16.59 inches was the most rain associated with a tropical system in recorded state history. Murfreesboro (Pike County) …

Cnidarians

aka: Hydroids
aka: Corals
aka: Jellyfishes
aka: Sea Anemones
Cnidarians (hydroids, jellyfishes, corals, and sea anemones) form a diverse phylum (Cnidaria, old Phylum Coelenterata) that contains more than 10,000 species. The phylum also includes the parasitic Myxozoa. Typical cnidarians inhabit aquatic (predominantly marine) environments. Cnidarians are divided into two major groups: the Anthozoa (corals, sea anemones, and sea pens), which live as sessile polyps, and the subphylum Medusozoa (Hydra, jellyfishes, and sea wasps), many of which form a free-swimming medusa as well as polyps. There are five main classes: Anthozoa, Cubozoa, Hydrozoa, Scyphozoa, and Staurozoa. Only a few cnidarians can be found in Arkansas, including a jellyfish seen in lakes and rivers. In terms of evolutionary relationships, modern molecular phylogenetic results support the notion that anthozoans represent the first …

Coccidia

Coccidians are microorganisms belonging to the Phylum Apicomplexa and Suborder Eimeriorina, which includes eight to thirteen families, about 39 genera, and well over 2,000 species. These protists are intracellular (meaning they function inside the cell) parasites of medical and veterinary importance, including those in the genera Caryospora, Cryptosporidium, Cyclospora, Eimeria, Isospora, Sarcocystis, and Toxoplasma. Most are considered intestinal parasites that infect both invertebrates as well those animals in all vertebrate classes. These parasites cannot complete their life cycle without exploiting a host. Coccidiosis is a general term for the disease they can cause, and it is recognized as a major health concern in wild animal populations, domestic animals, and zoo animals. However, some infections appear not to cause any pathology …

Cockroaches

aka: Blattodea
Cockroaches belong to the Phylum Arthropoda, Subphylum Labiata, Superclass Hexapoda, Class Insecta, and Order Blattodea. The order includes approximately 4,600 species in almost 500 genera and seven families. Very likely at least twice this number remains to be discovered and described worldwide. Some of the most well-known cockroach examples are two pest species belonging to the family Blattidae: the American cockroach (Periplaneta americana) and German cockroach (Blattella germanica). Cockroaches are considered one of the most successful groups of invertebrates because of their adaptability in various environmental conditions and occupy a very wide range of habitats from caves to mountains to rainforests to deserts. As a group, cockroaches also exhibit a remarkable diversity of form, coloration, size, and behavior. Although no …

Coffin, Frank Barbour

Frank Barbour Coffin was an African American pharmacist who owned and operated one of the earliest drugstores serving the Black community of Little Rock (Pulaski County). He was also one of the country’s unnoted African American poets of the nineteenth and twentieth century, barely remembered today for his two volumes of poetry and other works printed in various publications. F. B. Coffin was born on January 12, 1870, in Holly Springs, Mississippi, the son of Samuel and Josephine Barton Coffin. Holly Springs was a small town in northern Mississippi, about forty miles from Memphis, Tennessee. His mother died before he was twelve years old, leaving Coffin and at least four other siblings to be raised by their father, a farmer. …

Coggs, Granville Coleridge

Granville Coggs was a pilot in the United States Army Air Corps and was one of the Original Tuskegee Airmen. He later attended Harvard Medical School and became the first African American to serve as staff physician at the Kaiser Hospital in San Francisco, California. In 2001, he became a member of the Arkansas Black Hall of Fame. Granville Coleridge Coggs was born on July 30, 1925, in Pine Bluff (Jefferson County) to Dr. Tandy Washington Coggs and Nannie Hinkle Coggs. The family later moved to Little Rock (Pulaski County). His father was an educator who served as the president of Arkansas Baptist College from 1937 to 1955. Coggs attended Dunbar High School, graduating in 1942. Coggs took classes at …

Collembollans

aka: Springtails
Springtails (collembolans) belong to the phylum Arthropoda and subphylum Hexapoda. They form the largest (about thirty-five families and 9,000 different species) of the three lineages of modern hexapods that are no longer considered to be included in the class Insecta (the other two are the proturan and dipluran apterygotes). Since each has internal mouthparts, the three are sometimes grouped together into a class called Entognatha. However, they do not appear to be any more closely related to one another than they all are to insects, which have external mouthparts. Indeed, they do share some features of insects, such as a body divided into three parts, a head with antennae, a three-segmented thorax, and each segment having a pair of jointed …

Community Mental Health Centers

Community mental health centers (CMHCs) are designed for those with mental health concerns but inadequate resources to pay for services. They vary regarding the range of services provided. Some centers offer individual and group psychotherapy and medication management, while others include partial hospitalization programs; psychological, personality, forensic, and intellectual evaluations; emergency/crisis treatment; and consultation/education programs. Most CMHCs determine clients’ fees from a “sliding scale,” meaning that the fee is based upon the person’s income level and ability to pay. Fees can be as low as $5 or $10 per session. The costs of providing services are funded by federal, state, and local grants. As of 2011, fifteen community mental health centers in Arkansas serve more than 141,000 individuals throughout the …

Conway Regional Health System

Founded in 1921, Conway Regional Health System (CRHS), anchored by Conway Regional Medical Center (CRMC) in Conway (Faulkner County), serves Faulkner, Cleburne, Conway, Perry, Pope, Van Buren, and Yell counties. CRHS’s mission is to provide high-quality healthcare services for the region. During a meeting of the Conway Rotary Club in 1921, Dr. Cecil H. Dickerson, a local physician and club member, proposed building a hospital in the town. (The Rotary Club is an international community service organization for business and professional leaders.) During 1922 and 1923, Dickerson, joined by community leaders and activists, launched a bond drive to fund the new hospital’s construction. Local women organized the Faulkner County Hospital Auxiliary to raise funds. John E. Little, a Conway banker …

Coronavirus Disease 2019 (COVID-19) Pandemic

The Coronavirus Disease 2019 (COVID-19) began sweeping the world beginning in late 2019. The virus created a large-scale public health crisis and caused some countries to quarantine entire regions—or, in the case of Italy, the entire nation. The pandemic also cratered the economies of many nations throughout the world. The virus was first detected in Arkansas in March 2020. COVID-19 is an infectious disease closely related to the original SARS virus (SARS-CoV), which produced a worldwide epidemic in 2002–2003; the virus that causes COVID-19 is, in fact, designated SARS-CoV-2. The name stems from the virus’s appearance in electron micrographs, exhibiting a crown (corona) shape. Symptoms of COVID-19 include cough and fever, and the disease spreads like influenza, through droplets in …

Cotter Bridge

aka: R. M. Ruthven Bridge
Completed in 1930, the R. M. Ruthven Bridge, originally named and often still called the Cotter Bridge, is located near Cotter (Baxter County) on the business route of U.S. Highway 62 and crosses the White River between Baxter and Marion counties. Recognizable for its Rainbow Arches, it was the first landmark in Arkansas to become a National Historic Civil Engineering Landmark and is one of only a small number of bridges designated as such. East-west travelers through northern Arkansas often encountered problems crossing the White River. Although ferries operated at several places along the river, the river had a tendency to flood rapidly, grounding the ferries and hindering traffic sometimes for several days. The fastest detour was to cross 100 …

Coulter, Wallace Henry

Wallace Henry Coulter was an engineer, inventor, and entrepreneur who was co-founder and chairman of Coulter Corporation, a worldwide medical diagnostics company headquartered in Miami, Florida. The two great passions of his life were applying engineering principles to scientific research and embracing the diversity of world cultures. Wallace Coulter was born on February 17, 1913, in Little Rock (Pulaski County) to Joseph R. Coulter and Minnie May Johnson Coulter. His father was a train dispatcher, and his mother was an elementary school teacher; he had one brother. Coulter spent his youth in McGehee (Desha County), graduating from McGehee High School. He attended his first year of college at Westminster College in Fulton, Missouri; his interest in electronics, however, led him …