|
Plasmodium Aegyptensis
''Plasmodium aegyptensis'' is a parasite of the genus ''Plasmodium'' subgenus ''Vinckeia'' which infects the Egyptian grass rat ('' Arvicanthis niloticus''). The insect vector(s) for this species is not yet known. Description This species was first described in 1975 by Abd-el-Aziz ''et al.'' in Assiut from a group of Egyptian grass rats which had been captured. The parasite has not been isolated from other Egyptian grass rats since. As such, only the parasite stages which infect red blood cells of the vertebrate host have been described. When ''P. aegyptensis'' infects red blood cells in its mammalian host, it forms compact rings with a small food vacuole. Trophozoite forms are compact and rounded. Schizonts generally contain six merozoites (although 4 to 8 have been observed). When the parasites differentiate into gametocyte A gametocyte is a eukaryotic germ cell that divides by mitosis into other gametocytes or by meiosis into gametids during gametogenesis. Male gamet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
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] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasmodium
''Plasmodium'' is a genus of unicellular eukaryotes that are obligate parasites of vertebrates and insects. The life cycles of ''Plasmodium'' species involve development in a blood-feeding insect host which then injects parasites into a vertebrate host during a blood meal. Parasites grow within a vertebrate body tissue (often the liver) before entering the bloodstream to infect red blood cells. The ensuing destruction of host red blood cells can result in malaria. During this infection, some parasites are picked up by a blood-feeding insect ( mosquitoes in majority cases), continuing the life cycle. ''Plasmodium'' is a member of the phylum Apicomplexa, a large group of parasitic eukaryotes. Within Apicomplexa, ''Plasmodium'' is in the order Haemosporida and family Plasmodiidae. Over 200 species of ''Plasmodium'' have been described, many of which have been subdivided into 14 subgenera based on parasite morphology and host range. Evolutionary relationships among different ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vinckeia
''Vinckeia'' is a subgenus of the genus ''Plasmodium'' — all of which are parasitic alveolates. The subgenus ''Vinckeia'' was created by Cyril Garnham in 1964 to accommodate the mammalian parasites other than those infecting the primates. Diagnostic features Species in this subgenus infect mammals other than the higher primates. Species infecting lemurs have since been included in this subgenus. This classification may not be correct. Schizonts: These do not fill the erythrocyte and do not show true stippling. They give rise normally to 8 or fewer merozoites. Schizogony normally takes three days or less. Merozoites: Gametocytes: These are spherical. Species in this subgenus The following is a list of species in subgenus ''Vinckeia'' and their hosts. *''Plasmodium achromaticum'' — insectivorous bat species *''Plasmodium aegyptensis'' — African grass rat (''Arvicanthis niloticus'') *''Plasmodium anomaluri'' — African flying squirrel (''Anomalurus'' species) *''Pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arvicanthis Niloticus
''Arvicanthis'' is a genus of rodent from Africa. They are commonly referred to as unstriped grass mice, unstriped grass rats, and kusu rats. Species Genus ''Arvicanthis'' - unstriped grass mice * Abyssinian grass rat, ''Arvicanthis abyssinicus'' Rüppell, 1842 * Sudanian grass rat, ''Arvicanthis ansorgei'' Thomas, 1910 * Blick's grass rat, ''Arvicanthis blicki'' Frick, 1914 * Nairobi grass rat, ''Arvicanthis nairobae'' J. A. Allen, 1909 * Neumann's grass rat, ''Arvicanthis neumanni'' Matschie, 1894 * African grass rat, ''Arvicanthis niloticus'' É. Geoffroy, 1803 * Guinean grass rat, ''Arvicanthis rufinus'' Temminck, 1853 Genetic evidence indicates that the extinct ''Canariomys ''Canariomys'' is an extinct genus of rodents (Old World rats and mice) that once existed on the islands of Tenerife and Gran Canaria, part of the Canary Islands, Spain. These giant rats could reach a weight of about . They were herbivores; thei ...'' is also nested within this genus. References *Mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assiut
AsyutAlso spelled ''Assiout'' or ''Assiut'' ( ar, أسيوط ' , from ' ) is the capital of the modern Asyut Governorate in Egypt. It was built close to the ancient city of the same name, which is situated nearby. The modern city is located at , while the ancient city is located at . The city is home to one of the largest Coptic Catholic churches in the country. History Names and etymology The name of the city is derived from early Egyptian Zawty (''Z3JW.TJ'') (late Egyptian, Səyáwt) adopted into the Coptic as Syowt , which means "''Guardian''" of the northern approach of Upper Egypt. In Graeco-Roman Egypt, it was called Lycopolis or Lykopolis ( el, Λυκόπολις, ""), ('wolf city') Lycon, or Lyco. Ancient Asyut Ancient Asyut was the capital of the Thirteenth Nome of Upper Egypt (''Lycopolites Nome'') around 3100 BC. It was located on the western bank of the Nile. The two most prominent gods of ancient Egyptian Asyut were Anubis and Wepwawet, both funerary de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Food Vacuole
The food vacuole, or digestive vacuole, is an organelle found in simple eukaryotes such as protists. This organelle is essentially a lysosome. During the stage of the symbiont parasites' lifecycle where it resides within a human (or other mammalian) red blood cell, it is the site of haemoglobin digestion and the formation of the large haemozoin crystals that can be seen under a light microscope. See also * Protists * Eukaryote * Amoeba * Lysosome * Enzymes * Euglenid Euglenids (euglenoids, or euglenophytes, formally Euglenida/Euglenoida, ICZN, or Euglenophyceae, ICBN) are one of the best-known groups of flagellates, which are excavate eukaryotes of the phylum Euglenophyta and their cell structure is typical ...s * Paramecia References Malaria {{Eukaryote-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trophozoite
A trophozoite (G. ''trope'', nourishment + ''zoon'', animal) is the activated, feeding stage in the life cycle of certain protozoa such as malaria-causing ''Plasmodium falciparum'' and those of the ''Giardia'' group. (The complement of the trophozoite state is the thick-walled cyst form). Life cycle stages Trophozoite and cyst stages are shown in the life cycle of '' Balantidium coli'' the causative agent of balantidiasis. In the apicomplexan life cycle the trophozoite undergoes schizogony (asexual reproduction) and develops into a schizont which contains merozoites. The trophozoite life stage of ''Giardia ''Giardia'' ( or ) is a genus of anaerobic flagellated protozoan parasites of the phylum Metamonada that colonise and reproduce in the small intestines of several vertebrates, causing the disease giardiasis. Their life cycle alternates betwee ...'' colonizes and proliferates in the small intestine. Trophozoites develop during the course of the infection into cysts which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schizont
Apicomplexans, a group of intracellular parasites, have life cycle stages that allow them to survive the wide variety of environments they are exposed to during their complex life cycle. Each stage in the life cycle of an apicomplexan organism is typified by a ''cellular variety'' with a distinct morphology and biochemistry. Not all apicomplexa develop all the following cellular varieties and division methods. This presentation is intended as an outline of a hypothetical generalised apicomplexan organism. Methods of asexual replication Apicomplexans (sporozoans) replicate via ways of multiple fission (also known as schizogony). These ways include , and , although the latter is sometimes referred to as schizogony, despite its general meaning. Merogony is an asexually reproductive process of apicomplexa. After infecting a host cell, a trophozoite ( see glossary below) increases in size while repeatedly replicating its nucleus and other organelles. During this process, the orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gametocyte
A gametocyte is a eukaryotic germ cell that divides by mitosis into other gametocytes or by meiosis into gametids during gametogenesis. Male gametocytes are called '' spermatocytes'', and female gametocytes are called '' oocytes''. Development The development of gametogonia to primary gametocytes is called gametocytogenesis. The further development of primary gametocytes to secondary gametocytes is a part of gametidogenesis. Gametogenesis is the formation or production of gametes (taking place during meiosis). The development and maturation of sex cells also takes place during meiosis. Gametogenesis is also the process of formation in male and female gametes that occur in the gonads (ovary and testis). Both male and female produce gametes. Male gametocytes are called spermatocytes and female gametocytes are called oocytes. The term gametocyte is also used, for example, when talking about gametocytes of species like ''Plasmodium falciparum'' or ''Plasmodium vivax'', which tra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Gametocyte")