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Black piedra | |
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Black piedra nodules on hair | |
Specialty | Infectious disease ![]() |
Black piedra is a form of piedra caused by Piedraia hortae . [1]
Piedra is a hair disease caused by a fungus.
Piedraia hortae is a superficial fungus that exists in the soils of tropical and subtropical environments and affects both sexes of all ages. The fungus grows very slowly, forming dark hyphae, which contain chlamydoconidia cells and black colonies when grown on agar. Piedraia hortae is a dermatophyte and causes a superficial fungal infection known as black piedra, which causes the formation of black nodules on the hair shaft and leads to progressive weakening of the hair. The infection usually infects hairs on the scalp and beard, but other varieties tend to grow on pubic hairs. The infection is usually treated with cutting or shaving of the hair and followed by the application of anti-fungal and topical agents. The fungus is used for cosmetic purposes to darken hair in some societies as a symbol of attractiveness.
Terbinafine has been used in the treatment. [2]
Piedras Negras is the modern name for a ruined city of the pre-Columbian Maya civilization located on the north bank of the Usumacinta River in the Petén department of northeastern Guatemala. Piedras Negras is one of the most powerful of the Usumacinta ancient Maya urban centers. Occupation at Piedras Negras is known from the Late Preclassic period onward, based on dates retrieved from epigraphic information found on multiple stelae and altars at the site. Piedras Negras is an archaeological site known for its large sculptural output when compared to other ancient Maya sites. The wealth of sculpture, in conjunction with the precise chronological information associated with the lives of elites of Piedras Negras, has allowed archaeologists to reconstruct the political history of the Piedras Negras polity and its geopolitical footprint.
Piedras Negras is a city and seat of the surrounding municipality of the same name in the Mexican state of Coahuila. It stands at the northeastern edge of Coahuila on the U.S.-Mexico border, across the Rio Grande from Eagle Pass in the U.S. state of Texas. In the 2015 census the city had a population of 163,595 inhabitants, while the metropolitan area had a population of 245,155 inhabitants. The Piedras Negras and the Eagle Pass areas are connected by the Eagle Pass-Piedras Negras International Bridge, Camino Real International Bridge, and the Eagle Pass Union Pacific International Railroad Bridge.
Las Piedras is a municipality in east Puerto Rico (U.S.) located in the center region of the island, north of Yabucoa; south of Canóvanas and Río Grande; east of Juncos and San Lorenzo; and west of Naguabo and Humacao. Las Piedras is spread over 7 wards and Las Piedras Pueblo. It is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area.
Terbinafine, sold under the brand name Lamisil among others, an antifungal medication used to treat pityriasis versicolor, fungal nail infections, and ringworm including jock itch and athlete's foot. It is either taken by mouth or applied to the skin as a cream or ointment. The cream and ointment are not effective for nail infections.
Dermatophytes are a common label for a group of three types of fungus that commonly causes skin disease in animals and humans. These anamorphic mold genera are: Microsporum, Epidermophyton and Trichophyton. There are about 40 species in these three genera. Species capable of reproducing sexually belong in the teleomorphic genus Arthroderma, of the Ascomycota.
Tinea corporis, also known as ringworm, is a superficial fungal infection (dermatophytosis) of the arms and legs, especially on glabrous skin; however, it may occur on any part of the body. It is similar to other forms of tinea.
Tinea capitis is a cutaneous fungal infection (dermatophytosis) of the scalp. The disease is primarily caused by dermatophytes in the Trichophyton and Microsporum genera that invade the hair shaft. The clinical presentation is typically single or multiple patches of hair loss, sometimes with a 'black dot' pattern, that may be accompanied by inflammation, scaling, pustules, and itching. Uncommon in adults, tinea capitis is predominantly seen in pre-pubertal children, more often boys than girls.
Onychomycosis, also known as tinea unguium, is a fungal infection of the nail. Symptoms may include white or yellow nail discoloration, thickening of the nail, and separation of the nail from the nail bed. Toenails or fingernails may be affected, but it is more common for toenails to be affected. Complications may include cellulitis of the lower leg. A number of different types of fungus can cause onychomycosis including dermatophytes and Fusarium. Risk factors include athlete's foot, other nail diseases, exposure to someone with the condition, peripheral vascular disease, and poor immune function. The diagnosis is generally suspected based on the appearance and confirmed by laboratory testing.
Río Piedras is a former municipality of Puerto Rico, which was consolidated with the municipality of San Juan, Puerto Rico in 1951. It was founded in 1714, and has been the home of the University of Puerto Rico's main campus since 1903, earning the popular name of Ciudad Universitaria.
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Butenafine hydrochloride is a synthetic benzylamine antifungal, marketed under the trade names Mentax, Butop (India) and is the active ingredient in Lotrimin Ultra. It is structurally related to synthetic allylamine antifungals such as terbinafine.
The Monster of Piedras Blancas is a 1959 independently made American black-and-white science fiction-monster film, produced by Jack Kevan, written and directed by Irvin Berwick, that stars Jeanne Carmen, Les Tremayne, John Harmon, Don Sullivan, Forrest Lewis, and Pete Dunn. The film was distributed by Filmservice Distributors Corporation as a double feature with Okefenokee.
Piedra Vista High School (PVHS) is a public high school in Farmington, New Mexico, United States, founded in 1998. It is part of the Farmington Municipal School District.
Candidal onychomycosis is an infection of the nail plate by fungus caused by Candida. In one study Candida parapsilosis was the most common species; Candida albicans is also a common agent.
Fusariosis is an infection seen in neutropenic patients, and is a significant opportunistic pathogen in patients with hematologic malignancy.
Piedra is an unincorporated community in Fresno County, California. It is located on the south bank of the Kings River 23 miles (37 km) east of Fresno, at an elevation of 538 feet.
Yoʼnal Ahk III, also known as Ruler 5, was an ajaw of Piedras Negras, an ancient Maya settlement in Guatemala. He ruled during the Late Classic Period, from 758 to 767 AD. Yoʼnal Ahk III ascended to the throne upon the death of Itzam Kʼan Ahk II, who may have been Yoʼnal Ahk's father. He was succeeded by his probable brother, Haʼ Kʼin Xook in around 767 AD. Yoʼnal Ahk III left behind two surviving stelae at Piedras Negras, namely Stelae 14 and 16, the former of which has been called one of the finest niche stelae, according to Simon Martin and Nikolai Grube.
The Battle of Nacogdoches culminated on August 2, 1832, after a group of Texan colonists resisted an order issued in July by the commander of the Mexican Army at Nacogdoches, Texas to surrender their arms. The situation soon escalated into a major battle.
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