|
Lice (other)
Louse (: lice) is the common name for any member of the infraorder Phthiraptera, which contains nearly 5,000 species of wingless parasitic insects. Phthiraptera was previously recognized as an order, until a 2021 genetic study determined that they are a highly modified lineage of the order Psocodea, whose members are commonly known as booklice, barklice or barkflies. Lice are obligate parasites, living externally on warm-blooded hosts, which include every species of bird and mammal, except for monotremes, pangolins, and bats. Chewing lice live among the hairs or feathers of their host and feed on skin and debris, whereas sucking lice pierce the host's skin and feed on blood and other secretions. They usually spend their whole life on a single host, cementing their eggs, called nits, to hairs or feathers. The eggs hatch into nymphs, which moult three times before becoming fully grown, a process that takes about four weeks. Humans host two species of louse—the head louse and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Micrograph
A micrograph is an image, captured photographically or digitally, taken through a microscope or similar device to show a magnify, magnified image of an object. This is opposed to a macrograph or photomacrograph, an image which is also taken on a microscope but is only slightly magnified, usually less than 10 times. Micrography is the practice or art of using microscopes to make photographs. A photographic micrograph is a photomicrograph, and one taken with an electron microscope is an electron micrograph. A micrograph contains extensive details of microstructure. A wealth of information can be obtained from a simple micrograph like behavior of the material under different conditions, the phases found in the system, failure analysis, grain size estimation, elemental analysis and so on. Micrographs are widely used in all fields of microscopy. Types Photomicrograph A light micrograph or photomicrograph is a micrograph prepared using an optical microscope, a process referred to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotreme
Monotremes () are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas. Monotremes are typified by structural differences in their brains, jaws, digestive tract, reproductive tract, and other body parts, compared to the more common mammalian types. Although they are different from other living mammals in that they lay eggs, female monotremes are like other mammals in that they nurse their young with milk. Monotremes have been considered by some authors to be members of Australosphenida, a clade that contains extinct mammals from the Jurassic and Cretaceous of Madagascar, South America, and Australia, but this categorization is disputed and their taxonomy is under debate. All extant species of monotremes are indigenous to Australia and New Guinea, although they were also present during the Late Cretaceous and Paleocene epochs in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finnegans Wake
''Finnegans Wake'' is a novel by Irish literature, Irish writer James Joyce. It was published in instalments starting in 1924, under the title "fragments from ''Work in Progress''". The final title was only revealed when the book was published on 4 May 1939. The initial reception of ''Finnegans Wake'' was largely negative, ranging from bafflement at its radical reworking of language to open hostility towards its seeming pointlessness and lack of respect for literary conventions. Joyce, however, asserted that every syllable was justified. Its allusive and Experimental literature, experimental style has resulted in it having a reputation as one of the most Readability, difficult works in literature. Although the base language of the novel is English, it is an English that Joyce modified by combining and altering words from many languages into his own distinctive idiom. Some commentators believe this technique was Joyce's attempt to reproduce the way that memories, people, and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Joyce
James Augustine Aloysius Joyce (born James Augusta Joyce; 2 February 1882 – 13 January 1941) was an Irish novelist, poet, and literary critic. He contributed to the modernist avant-garde movement and is regarded as one of the most influential and important writers of the twentieth century. Joyce's novel ''Ulysses (novel), Ulysses'' (1922) is a landmark in which the episodes of Homer's ''Odyssey'' are paralleled in a variety of literary styles, particularly stream of consciousness. Other well-known works are the short-story collection ''Dubliners'' (1914) and the novels ''A Portrait of the Artist as a Young Man'' (1916) and ''Finnegans Wake'' (1939). His other writings include three books of poetry, a play, letters, and occasional journalism. Born in Dublin into a middle-class family, Joyce attended the Jesuit Clongowes Wood College in County Kildare, then, briefly, the Congregation of Christian Brothers, Christian Brothers–run O'Connell School. Despite the chaotic family li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and transitioned into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages. Population decline, counterurbanisation, the collapse of centralised authority, invasions, and mass migrations of tribes, which had begun in late antiquity, continued into the Early Middle Ages. The large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—once part of the Byzantine Empireâ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typhus
Typhus, also known as typhus fever, is a group of infectious diseases that include epidemic typhus, scrub typhus, and murine typhus. Common symptoms include fever, headache, and a rash. Typically these begin one to two weeks after exposure. The diseases are caused by specific types of bacterial infection. Epidemic typhus is caused by '' Rickettsia prowazekii'' spread by body lice, scrub typhus is caused by '' Orientia tsutsugamushi'' spread by chiggers, and murine typhus is caused by '' Rickettsia typhi'' spread by fleas. Vaccines have been developed, but none is commercially available. Prevention is achieved by reducing exposure to the organisms that spread the disease. Treatment is with the antibiotic doxycycline. Epidemic typhus generally occurs in outbreaks when poor sanitary conditions and crowding are present. While once common, it is now rare. Scrub typhus occurs in Southeast Asia, Japan, and northern Australia. Murine typhus occurs in tropical and subtropi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vector (epidemiology)
In epidemiology, a disease vector is any living agent that carries and transmits an infectious pathogen such as a parasite or microbe, to another living organism. Agents regarded as vectors are mostly blood-sucking (Hematophagy, hematophagous) arthropods such as mosquitoes. The first major discovery of a disease vector came from Ronald Ross in 1897, who discovered the malaria pathogen when he dissected the stomach tissue of a mosquito. Arthropods Arthropods form a major group of pathogen vectors with mosquitoes, Fly, flies, Sandfly, sand flies, lice, fleas, ticks, and mites transmitting a huge number of pathogens. Many such vectors are haematophagous, which feed on blood at some or all stages of their lives. When the insects and ticks feed on blood, the pathogen enters the blood stream of the host. This can happen in different ways. The ''Anopheles'' mosquito, a vector for malaria, filariasis, and various arthropod-borne-viruses (arboviruses), inserts its delicate mouthpart under ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pthirus
''Pthirus'' is a genus of lice. There are only two extant species, and they are the sole known members of the family Pthiridae. '' Pthirus gorillae'' infests gorilla Gorillas are primarily herbivorous, terrestrial great apes that inhabit the tropical forests of equatorial Africa. The genus ''Gorilla'' is divided into two species: the eastern gorilla and the western gorilla, and either four or five su ...s, and '' Pthirus pubis'' afflicts humans, and is commonly known as the crab louse or pubic louse. The two species diverged some 3.3 million years ago. Since 1958 the generic name ''Pthirus'' has been spelled with ''pth'' rather than ''phth'', despite this being based on a misspelling of the Greek-derived ''phthirus''. References External links * Lice Parasitic arthropods of mammals Parasitic infestations, stings, and bites of the skin {{louse-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pubic Louse
The crab louse or pubic louse (''Pthirus pubis'') is an insect that is an obligate ectoparasite of humans, feeding exclusively on blood. The crab louse usually is found in the person's pubic hair. Although the louse cannot jump, it can also live in other areas of the body that are covered with coarse hair, such as the perianal area, the general body hair, and the eyelashes (in children). Humans are the only known hosts of the crab louse, although a closely related species, '' Pthirus gorillae'', infects gorillas. The human parasite is thought to have diverged from ''Pthirus gorillae'' approximately 3.3 million years ago. It is more distantly related to the genus '' Pediculus'', which contains the human head and body lice and lice that affect chimpanzees and bonobos. Description An adult crab louse is about 1.3–2 mm long (slightly smaller than the body louse and head louse), and can be distinguished from those other species by its almost round body. Another distinguishi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pediculus Humanus
''Pediculus humanus'' is a species of louse that infects humans. It comprises two subspecies: *''Pediculus humanus humanus'' Linnaeus, 1758 – body louse *''Pediculus humanus capitis'' De Geer, 1767 – head louse The head louse (''Pediculus humanus capitis'') is an obligate parasite, obligate parasitism, ectoparasite of humans. Head lice are wingless insects that spend their entire lives on the human scalp and feed exclusively on human blood. Humans are ... References External links * Lice Insects described in 1758 Parasitic arthropods of humans Taxa named by Carl Linnaeus {{louse-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Body Louse
The body louse (''Pediculus humanus humanus'', also known as ''Pediculus humanus corporis'') or the cootie is a hematophagic ectoparasite louse that infests humans. It is one of three lice which infest humans, the other two being the head louse, and the crab louse or pubic louse. Body lice may lay eggs on the host's hairs and clothing, but clothing is where the majority of eggs are usually secured. Since body lice cannot jump or fly, they spread by direct contact with another person or more rarely by contact with clothing or bed sheets that are infested. Body lice are disease vectors and can transmit pathogens that cause human diseases such as epidemic typhus, trench fever, and relapsing fever. In developed countries, infestations are only a problem in areas of poverty where there is poor body hygiene, crowded living conditions, and a lack of access to clean clothing. Outbreaks can also occur in situations where large groups of people are forced to live in unsanitary c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Head Louse
The head louse (''Pediculus humanus capitis'') is an obligate parasite, obligate parasitism, ectoparasite of humans. Head lice are wingless insects that spend their entire lives on the human scalp and feed exclusively on human blood. Humans are the only known host (biology), hosts of this specific parasite, while Common chimpanzee, chimpanzees and bonobos host a closely related species, ''Pediculus schaeffi''. Other species of lice infest most orders of mammals and all orders of birds. Lice differ from other hematophagic ectoparasites such as fleas in spending their entire lifecycle on a host. Head lice cannot fly, and their short, stumpy legs render them incapable of jumping, or even walking efficiently on flat surfaces. The non-disease-carrying head louse differs from the related disease-carrying body louse (''Pediculus humanus humanus'') in preferring to attach eggs to scalp hair rather than to clothing. The two subspecies are morphologically almost identical, but do not norm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
