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Definition of dimorphism
: the condition or property of being dimorphic or dimorphous: such as. a : the existence of two different forms (as of color or size) of a species especially in the same population sexual dimorphism. b : the existence of a part (such as leaves of a plant) in two different forms.
The dimorphic species (Onygenaceae) were significantly separated from dermatophytes (Arthrodermataceae) and from a third group including geophilic or very weakly pathogenic species (Onygenaceae and Gymnoascaceae).
Sexual Dimorphism. Sexual dimorphism is the systematic difference in form between individuals of different sex in the same species. For example, in some species, including many mammals, the male is larger than the female. … For example, the body masses of both male and female humans are approximately normally distributed …
Dimorphic – Literally, dimorphic means occurring in two forms. … When used in descriptions of evergreen azaleas (Rhododendron subgenus Tsutsusi), the term dimorphic refers to the two forms of leaves found on a given plant, not to the sequence of their emergence and senescence.
Students of medical mycology are taught the memory aid “Mold in the cold, yeast in the heat” to help them remember this. An example of a dimorphic fungus is Penicillium marneffei.
Morphology. Yeasts are single-celled forms that reproduce by budding, whereas molds form multicellular hyphae. Dimorphic fungi grow as yeasts or spherules in vivo, as well as in vitro at 37°C, but as molds at 25°C.
This process, known as dimorphism, is a characteristic of several pathogenic fungi, e.g., Histoplasma capsulatum, Blastomyces dermatitidis, and Paracoccidioides brasiliensis, and appears to be directly related to adaptation from a saprobic to a parasitic existence.
Despite this dramatic morphological transition, Cryptococcus is not considered by some to be a dimorphic fungus because yeast cells are the predominant form in the environment and in the human host, and it is likely that the morphological transition is not involved in infection.
The most prevalent superficial mycoses are caused by different groups of pathogenic fungi, the dermatophytes or ringworm fungi, Candida and Malassezia species.
ym-shift. (Science: microbiology) The change in shape by dimorphic fungi when they shift from the yeast (Y) form in the animal body to the mould or mycelial form (M) in the environment.
albicans is commonly used as a model organism for fungal pathogens. It is generally referred to as a dimorphic fungus since it grows both as yeast and filamentous cells. However, it has several different morphological phenotypes including opaque, GUT, and pseudohyphal forms.
Sexual dimorphism is the condition where the sexes of the same species exhibit different characteristics, particularly characteristics not directly involved in reproduction. … Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits.
In general, dimorphic fungi produce a mold form at 25-30°C and a yeast form at 35-37°C. An exception is Coccidioides immitis, which is not thermally dimorphic.
Humans today display relatively limited sexual dimorphism (≈15%), whereas some of the other hominoids (gorillas and orangutans) are highly dimorphic (>50%) (5, 9). Body mass is easily determined in living species.
Malassezia furfur, a common human yeast carried by most people, can start to act more like tinea corporis (ringworm). While most people are never bothered by this yeast, it is also is felt to be responsible for dandruff (seborrhea), which explains why some of the treatments used for dandruff also help tinea versicolor.
These are fungal infections of the body caused by fungal pathogens which can overcome the physiological and cellular defences of the normal human host by changing their morphological form.
Yeast-like fungi such as C. albicans are also described as being polymorphic fungus. This is because they present four types of morphology including the yeast cell, pseudohyphae, hyphae as well as chlamydospores.
dimorphic fungi. have the ability to grow both as yeasts and molds, depending on the conditions. acquired by inhalation of airborne spores from soil. cause systemic mycoses.
A dimorphic root system is a plant root system with two distinct root forms, which are adapted to perform different functions.
Dimorphic leaves are mostly observed in the evergreen azaleas plants. All the pinus and gnetum plants are well known for the similarity in the dimorphism of the leaves branches.
For example, the endemic thermally dimorphic fungi (Histoplasma capsulatum, Blastomyces dermatitidis, Coccidioides immitis/posadasii, Paracoccidiodes braziliensis and Penicillium marneffi) are frequent causes of CAP in defined geographic areas [46,47].
Many fungi in the Basidiomycota have a dimorphic life cycle, where a monokaryotic yeast form alternates with a dikaryotic hyphal form. … In these species, infection of a host appears to be closely linked to both dimorphism and the process of sexual reproduction.
Mold is a type of fungus that grows in multicellular filaments called hyphae. These tubular branches have multiple, genetically identical nuclei, yet form a single organism, known as a colony. In contrast, yeast is a type of fungus that grows as a single cell.
Molds are a group of fungi called “Hyphomycetes”, which are chracterized with having filamentous hyphae, and producing airborne spores or conidia (asexual propagules). In nature, molds are decomposers to recycle nature’s organic wastes. In medicine, they are the producers of antibiotics.
Dermatophytosis (tinea or ringworm), pityriasis versicolor (formerly tinea versicolor), and candidiasis (moniliasis) are the three most common types of superficial fungal infections.
Fungal skin infections are categorized into superficial and deep, with superficial infections defined as those limited to the stratum corneum of the epidermis, or to the hair and nails.
In general, most cutaneous mycoses require treatment with antifungal medications (e.g., azole antifungals, amphotericin, terbinafine). Antifungal medications may be topical or oral, and the type recommended generally depends on the severity of the infection.
Humans are commonly considered a relatively monomorphic species on the basis of our low bodily sexual dimorphism; however, given our species entrance into the cognitive niche, psycho- logical sex differences might be more indicative of where human evolution has been sex differentiated.
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