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Trichuris Muris
''Trichuris muris'' is a nematode parasite of mice. It is very similar to the human roundworm parasite ''Trichuris trichiura'' due to its immunological reactivity when crossed, and so is often used in related studies. Lifecycle Ingesting material that contains embryonated eggs allows for transmission and infection to occur. The eggs travel down to the cecum - a pouch located at the start of the large intestine - where larval hatching is induced. The larvae proceed to penetrate through the mucosal epithelium, then molt into their secondary stage of infection after 9–11 days. About 17 days after infection, the larvae arrive at the tertiary stage followed by a quaternary molt 5 days later. The larvae complete their last molt 29 days after infection and transform into mature dioecious adults. These whipworms use their anterior ends to embed themselves into the cells that line the walls of the large intestine. After establishing their place in the intestinal wall, the adult worms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematode
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-Parasitism, parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with Arthropod, arthropods, Tardigrade, tardigrades and other moulting animalia, animals in the clade Ecdysozoa, and unlike platyhelminthe, flatworms, have tubular digestion, digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted parasitism, parasitoidism, and micropreda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mouse
A mouse ( : mice) is a small rodent. Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best known mouse species is the common house mouse (''Mus musculus''). Mice are also popular as pets. In some places, certain kinds of field mice are locally common. They are known to invade homes for food and shelter. Mice are typically distinguished from rats by their size. Generally, when a muroid rodent is discovered, its common name includes the term ''mouse'' if it is smaller, or ''rat'' if it is larger. The common terms ''rat'' and ''mouse'' are not taxonomically specific. Typical mice are classified in the genus '' Mus'', but the term ''mouse'' is not confined to members of ''Mus'' and can also apply to species from other genera such as the deer mouse, ''Peromyscus''. Domestic mice sold as pets often differ substantially in size from the common house mouse. This is attributable to breeding a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roundworm
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with arthropods, tardigrades and other moulting animals in the clade Ecdysozoa, and unlike flatworms, have tubular digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over time. A 2013 survey of animal biodiversity published in the mega journal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichuris Trichiura
''Trichuris trichiura, Trichocephalus trichiuris'' or whipworm, is a parasitism, parasitic nematode, roundworm (a type of helminth) that causes trichuriasis (a type of helminthiasis which is one of the neglected tropical diseases) when it infects a human large intestine. It is commonly known as the ''whipworm'' which refers to the shape of the worm; it looks like a whip with wider "handles" at the posterior end. Life cycle The female ''T. trichiura'' produces 2,000–10,000 single-celled eggs per day. Eggs are deposited from human feces to soil where, after two to three weeks, they become embryonated and enter the "infective" stage. These embryonated infective eggs are ingested by hand-mouth or through formites and hatch in the human small intestine, exploiting the intestinal microflora as a stimulus to hatching. This is the location of growth and molting. The infective larvae penetrate the Intestinal villus, villi and continue to develop in the small intestine. The young wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Embryonated
Embryonated, unembryonated and de-embryonated are terms generally used in reference to eggs or, in botany, to seeds. The words are often used as professional jargon rather than as universally applicable terms or concepts. Examples of relevant fields in which the words are useful include reproductive biology, virology, microbiology, parasitology, entomology, and poultry husbandry. Since the words are widely used in the various disciplines, there seems to be little present prospect of replacing them with universal, definitive, and distinct terms. Meaning The terms ''embryonated'', ''unembryonated'' and ''de-embryonated'' respectively mean "having an embryo", "not having an embryo", and "having lost an embryo", and they most often refer to eggs. In Merriam-Webster the earliest known use of the term "embryonated" dates from 1687, while Oxford gives a reference dating from 1669. Embryonate The term ''embryonate'' can be used as an adjective to mean ''embryonated'', or as a noun to mean ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heligmosomoides Polygyrus
''Heligmosomoides polygyrus'', previously named ''Nematospiroides dubius'', is a naturally occurring intestinal roundworm of rodents. It belongs to the family Trychostrongylidae, and male and female worms are morphologically distinguishable. The parasite has a direct lifecycle, with its larval form being the infective stage. ''H. polygyrus'' has the ability to establish chronic infections in rodents and alter host immune responses. This nematode is widely used as a gastrointestinal parasitic model in immunological, pharmacological, and toxicological studies. Lifecycle and morphology This parasite has a direct lifecycle with no intermediate hosts. The lifecycle takes about 13–15 days to complete. Infected mice pass faeces containing eggs, and egg sizes vary between 70 and 84 micrometres (µm) in length and 37 and 53 µm in width. Eggs are shed from the host at the 8– to 16-cell stage and hatch in the environment, roughly 24 hours after passing through the host. L1 larv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nippostrongylus Brasiliensis
''Nippostrongylus brasiliensis'' is a gastrointestinal roundworm that infects rodents, primarily rats. This worm is a widely studied parasite due to its simple lifecycle and its ability to be used in animal models. Its lifecycle similar to the human hookworms ''Necator americanus'' and ''Ancylostoma duodenale'' which includes five molting stages to become sexually mature. Lifecycle Eggs located within the soil release motile, free-living worms that must moult twice (L1 and L2) to develop into their infective L3 stage. This L3 stage can penetrate through intact skin in as little as 4 hours. Once inside the host, the worms invade the venous circulation and are carried into the lungs, where they become trapped in the capillaries. When the worms mature into the L4 stage, they rupture the capillaries and are released into the alveoli, where they are coughed up and swallowed. They then reach the small intestines 3–4 days after the initial infection. The worms become adults after the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasites Of Rodents
Parasitism is a Symbiosis, close relationship between species, where one organism, the parasite, lives on or inside another organism, the Host (biology), host, causing it some harm, and is Adaptation, adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted paras ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasitic Nematodes Of Mammals
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the broomrapes. There are six major parasitic strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), trophicallytransmitted parasitism (by being eaten), vector-transmitted parasitism, parasitoidism, and micropredation. One major axis of classification concerns invasiveness: an endoparasite lives inside the host's body; an ect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
