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Chrysosporium
''Chrysosporium'' is a genus of hyaline hyphomycetes fungi in the family Onygenaceae. ''Chrysosporium'' colonies are moderately fast-growing, flat, white to tan to beige in color; they often have a powdery or granular surface texture. Hyaline, one-celled ( ameroconidia) are produced directly on vegetative hyphae by non-specialized conidiogenous cells. Conidia are typically pyriform to clavate with truncate bases (6 to 7 by 3.5 to 4 um) and are formed either intercalary (arthroconidia), laterally (often on pedicels), or terminally. Clinical significance Species of ''Chrysosporium'' are occasionally isolated from skin and nail scrapings, especially from feet, but, because they are common soil saprotrophs, they are usually considered as contaminants. There are about 22 species of Chrysosporium, several are keratinophilic with some also being thermotolerant, and cultures may closely resemble some dermatophytes, especially ''Trichophyton mentagrophytes'', and some strains m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blastomyces
''Chrysosporium'' is a genus of hyaline hyphomycetes fungi in the family Onygenaceae. ''Chrysosporium'' colonies are moderately fast-growing, flat, white to tan to beige in color; they often have a powdery or granular surface texture. Hyaline, one-celled ( ameroconidia) are produced directly on vegetative hyphae by non-specialized conidiogenous cells. Conidia are typically pyriform to clavate with truncate bases (6 to 7 by 3.5 to 4 um) and are formed either intercalary (arthroconidia), laterally (often on pedicels), or terminally. Clinical significance Species of ''Chrysosporium'' are occasionally isolated from skin and nail scrapings, especially from feet, but, because they are common soil saprotrophs, they are usually considered as contaminants. There are about 22 species of Chrysosporium, several are keratinophilic with some also being thermotolerant, and cultures may closely resemble some dermatophytes, especially '' Trichophyton mentagrophytes'', and some strain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyphomycetes
Hyphomycetes are a form classification of fungi, part of what has often been referred to as fungi imperfecti, Deuteromycota, or anamorphic fungi. Hyphomycetes lack closed fruit bodies, and are often referred to as moulds (or molds). Most hyphomycetes are now assigned to the Ascomycota, on the basis of genetic connections made by life-cycle studies or by phylogenetic analysis of DNA sequences; many remain unassigned phylogenetically. Although no longer considered a phylogenetically defined taxon, the prevalence of hyphomycete forms in nature, the built environment, and laboratories means that identification of members this group remains of practical importance. Taxonomic and nomenclatural history Because asexual forms of fungi usually occur separately from their sexual forms, when microscopic fungi began to be studied in the early 19th century, it was often unknown when two morphologically different forms were actually part of one species. The tendency for some organisms to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onygenaceae
The Onygenaceae are a family of fungi in the Ascomycota, class Eurotiomycetes. Genera These are the genera that are in the Onygenaceae, according to a 2021 review of fungal classification. Following the genus name is the taxonomic authority (those who first circumscribed the genus; standardized author abbreviations are used), year of publication, and the estimated number of species. * '' Amauroascus'' – 15 spp. * '' Aphanoascus'' – 18 spp. * '' Apinisia'' – 3 spp. * '' Arachnotheca'' – 1 sp. * '' Ascocalvatia'' – 1 sp. * '' Auxarthron'' – 13 spp. * '' Auxarthronopsis'' – 2 spp. * '' Bifidocarpus'' – 2 spp. * '' Byssoonygena'' – 1 sp. * '' Canomyces'' – 1 sp. * '' Castanedomyces'' – 1 sp. * '' Chlamydosauromyces'' – 1 sp. * '' Chrysosporium'' – 66 spp. * ''Coccidioides'' – 6 spp. * '' Currahomyces'' – 1 sp. * ''Kuehniella ''Kuehniella'' is a genus of fungi within the Onygenaceae family. The genus name of ''Kuehniella'' is in hono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
August Carl Joseph Corda
August Carl Joseph Corda (1809–1849) was a Czech physician and mycologist. This botanist is denoted by the author abbreviation when citing a botanical name. Early life and education Corda was born in Reichenberg (now Liberec), Bohemia on November 15, 1809. Corda's father was a textile seller. Both of Corda's parents died suddenly only a few weeks following his birth, and Corda was raised by his grandmother, attending the Normale School in Reichenberg. Corda's grandmother died in 1819 and Corda was sent to live with an "unacquainted family" for two years during which time he did not receive schooling. Two years later, Corda was transferred to the care of an uncle in Prague where he attended the "Lyceum of New Prague". As a result of family difficulties, Corda left the Lyceum in 1824 to attend polytechnical school. There, he studied physics under Franz Ignatz Cassian Hallaschka, chemistry under Josef Johann Steinmann, mineralogy under Franz Xaver Zippe, and botany under I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthroconidia
Arthroconidia are a type of fungal spore typically produced by segmentation of pre-existing fungal hyphae. Background These spores are asexual and are generally not as durable and environmentally persistent as, for instance, bacterial endospores or chlamydospores. Some medically significant pathogens, such as ''Coccidioides immitis'', and ''Coccidioides posadasii'', both causative agents of coccidioidomycosis (also known as San Joaquin Valley fever), are transmitted through airborne arthroconidia. The small size of the arthroconidia, 3 to 5 µm, allow them to lodge themselves into the terminal bronchioles of the lung. There, they develop into a thick-walled spherule filled with endospores that cause a pyogenic (pus-causing) inflammation. See also *Conidium A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an Asexual reproduction, asexual, non-motility, motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agkistrodon Contortrix Mokasen
''Agkistrodon contortrix mokasen'' was formerly a venomous pit viper subspecies found in the eastern United States. However, recent taxonomic changes do not recognize the northern copperhead (''A. c. mokasen'') as a valid taxon. New taxonomy The northern copperhead (''Agkistrodon contortrix mokasen'') was once classified as a subspecies of the copperhead (''Agkistrodon contortrix''). However, DNA based studies published in 2008 and 2015, revealed no significant genetic difference between the northern copperhead (''Agkistrodon contortrix mokasen ''), the southern copperhead (''Agkistrodon contortrix contortrix'') and the Osage copperhead (''Agkistrodon contortrix phaeogaster''). The three subspecies were synonymized and elevated to one species, with the oldest published name, ''Agkistrodon contortrix '', having priority. The resulting taxonomy does not recognize the northern copperhead (''Agkistrodon contortrix mokasen'') as a valid taxon.Guiher TJ, Burbrink FT (2008). ''Demograph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sistrurus Catenatus Catenatus
The massasauga (''Sistrurus catenatus'') is a rattlesnake species found in midwestern North America from southern Ontario to northern Mexico and parts of the United States in between. Like all rattlesnakes, it is a pit viper and is venomous. Three subspecies were recognized for more than a century, although research published in 2011 elevated two subspecies ''Sistrurus catenatus catenatus'' and ''Sistrurus catenatus tergeminus'', to full species: the eastern massasauga (''Sistrurus catenatus'') and the western massasauga (''Sistrurus tergeminus'').Kubatko, L.S.; Gibbs, H.L. & Bloomquist, E.W. 2011. ''Inferring Species-Level Phylogenies and Taxonomic Distinctiveness Using Multilocus Data in Sistrurus Rattlesnakes.'' Systematic Biology 60 (4):393–409 The status of the third subspecies was somewhat unresolved and it is tentatively recognized as the desert massasauga (''Sistrurus tergeminus edwardsii'') by some,Powell, Robert, Roger Conant, and Joseph T. Collins. 2016. ''Peterso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reptile
Reptiles, as most commonly defined are the animals in the class Reptilia ( ), a paraphyletic grouping comprising all sauropsids except birds. Living reptiles comprise turtles, crocodilians, squamates ( lizards and snakes) and rhynchocephalians ( tuatara). As of March 2022, the Reptile Database includes about 11,700 species. In the traditional Linnaean classification system, birds are considered a separate class to reptiles. However, crocodilians are more closely related to birds than they are to other living reptiles, and so modern cladistic classification systems include birds within Reptilia, redefining the term as a clade. Other cladistic definitions abandon the term reptile altogether in favor of the clade Sauropsida, which refers to all amniotes more closely related to modern reptiles than to mammals. The study of the traditional reptile orders, historically combined with that of modern amphibians, is called herpetology. The earliest known proto-reptiles originated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emerging Infectious Disease
An emerging infectious disease (EID) is an infectious disease whose incidence has increased recently (in the past 20 years), and could increase in the near future. The minority that are capable of developing efficient transmission between humans can become major public and global concerns as potential causes of epidemics or pandemics. Their many impacts can be economic and societal, as well as clinical. EIDs have been increasing steadily since at least 1940. For every decade since 1940, there has been a consistent increase in the number of EID events from wildlife-related zoonosis. Human activity is the primary driver of this increase, with loss of biodiversity a leading mechanism. Emerging infections account for at least 12% of all human pathogens. EIDs can be caused by newly identified microbes, including novel species or strains of virus (e.g. novel coronaviruses, ebolaviruses, HIV). Some EIDs evolve from a known pathogen, as occurs with new strains of influenza. EIDs may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histoplasma
''Histoplasma'' is a genus of dimorphic fungi commonly found in bird and bat fecal material. ''Histoplasma'' contains a few species, including—''Histoplasma capsulatum''—the causative agent of histoplasmosis; and ''Histoplasma capsulatum var. farciminosum'' (old term, ''Histoplasma farciminosum''), causing epizootic lymphangitis in horses. This fungus is mainly found in the Ohio and Mississippi River Valleys in the United States as well as Central/South America, Africa, Asia and Australia. Forms / Stages Histoplasma capsulatum has two forms: its environmental form is hyphae with microconidia and tuberculate macroconidia while its tissue form is a small intracellular yeast with a narrow neck and no bud with no capsule and can be detected in aerobic blood culture bottle. In the saprophytic stage, it bears features of both microconidia and macroconidia. Infection occurs through inhalation of the small microconidia or small mycelia fragments. The dimorphic mold-yeast trans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichophyton Mentagrophytes
''Trichophyton mentagrophytes'' is a species in the fungal genus '' Trichophyton''. It is one of three common fungi which cause ringworm in companion animals. It is also the second-most commonly isolated fungus causing tinea infections in humans, and the most common or one of the most common fungi that cause zoonotic skin disease (i.e., transmission of mycotic skin disease from species to species). ''Trichophyton mentagrophytes'' is being frequently isolated from dogs, cats, rabbits, guinea pigs and other rodents, though at least some genetic variants possess the potential of human-to-human transmission, e.g. Type VII and Type VIII. Particular genetic variants of the fungus have distinct geographic ranges. Drug resistance In ''T. mentagrophytes'', antifungal drug resistance is mainly associated with Type VIII isolates. Drug-resistant ''T. mentagrophytes'' strains have been found in many places across Asia and Europe. India is the most affected country, with the rate of microbi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dermatophytes
Dermatophyte (from Greek '' derma'' "skin" (GEN ''dermatos'') and ''phyton'' "plant") is a common label for a group of fungus of ''Arthrodermataceae'' that commonly causes skin disease in animals and humans. Traditionally, these anamorphic (asexual or imperfect fungi) 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 (see Teleomorph, anamorph and holomorph for more information on this type of fungal life cycle). As of 2019 a total of nine genera are identified and new phylogenetic taxonomy has been proposed. Dermatophytes cause infections of the skin, hair, and nails, obtaining nutrients from keratinized material. The organisms colonize the keratin tissues causing inflammation as the host responds to metabolic byproducts. Colonies of dermatophytes are usually restricted to the nonliving cornified la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
