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Caulleryellidae
The Caulleryellidae are a family of parasites in the phylum Apicomplexa. Species in this family mostly infect dipteran larvae. History This family was created by the parasitologist David Keilin in 1914.Keilin D (1914) CR Soc Biol Paris 76 (1) 768 Taxonomy Two genera are placed in this family - '' Caulleryella'' with five species and '' Tipulocystis'' with one. The type species is '' Caulleryellida aphiochaetae''. Lifecycle Species in the family are generally spread by the oral-faecal route. Replication occurs in the gut. Development is extracellular. The parasites develop attached to the host cell by an epimerite. Merogony occurs when nuclei are peripheral within the cell. The merozoites form a bouquet structure around the parent cell. The gamonts are elongated with an anterior neck. The gamete A gamete (; , ultimately ) is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caulleryella
''Caulleryella'' is a genus of parasitic alveolates of the phylum Apicomplexa. Species in this genus infect insects (''Diptera''). Taxonomy This genus was created by David Keilin in 1914.Keilin, D., 1914: Une nouvelle Schizogregarine, ''Caulleryella aphiochoetae'' ''n. g. n. sp.'', parasite intestinal d'une larve d'un Diptere cyclorhaphe (''Aphiochoeta rufipes'' Meig.). Compte Rendu de la Societe de Biologie Paris 76: 768-771 The genus was named after Professor Maurice Caullery at the Laboratoire d’Evolution des Etres Organises in Paris. There are five species currently recognised in this genus. The type species is '' Caulleryella aphiochaetae''. Description The species in this genus are spread by the orofaecal route. They infect the epithelium of the gut. The sporozoites are elongate and attach to intestinal epithelium. The trophozoites are flask shaped and have the neck embedded in the host cell. During merogony the cell becomes spheroidal with peripheral nuclei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neogregarinorida
The Neogregarinorida are an order of parasitic alveolates in the phylum Apicomplexa. Species in this order infect insects and are usually found in the fat body, hemolymph, hypodermis, intestine or Malpighian tubules. The most common site of infection is the fat body: many species are pathogenic for their hosts. The species in this order are predominantly intracellular parasites. Taxonomy Six families are in this order, with 13 genera. The type genus is '' Ophryocystis''. Two families (Ophryocystidae and Schizocystidae) belong to the suborder Schizogregarinina. They appear to have evolved from the Eugregarinorida. Merogony as part of the life cycle separates them from the Eugregarinorida and appears to have been derived as a secondary characteristic. A phylogenetic analysis of the small subunit RNA suggests ''Ophryocystis'' may actually be a eugregarine rather than a neogregarine. General characteristics * Merogony, gamogony and sporogony are present in all species * They ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tipulocystis
''Tipulocystis'' is a genus of parasitic alveolates of the phylum Apicomplexa. Species in this genus infect insects (''Diptera Flies are insects of the order Diptera, the name being derived from the Greek δι- ''di-'' "two", and πτερόν ''pteron'' "wing". Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced ...''). Taxonomy This genus was created by Kramár in 1950.Kramar (1950) Parasites in the larva of the crane-fly ''Tipula maxima'' Poda. Vestnik Ceskoslovenske Zoologicke Spolecnosti 14: 55-76 There is one species currently recognised in this genus. The type species is '' Tipulocystis maximae''. Description The species in this genus are spread by the orofaecal route. They infect the epithelium of the gut. After ingestion the sporozoites attach to the intestinal epithelial cells by a pseudomerite and become multinucleate, irregularly shaped plasmodia They then divide internally becoming mycetoid meronts w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryota
Eukaryotes () are organisms whose Cell (biology), cells have a cell nucleus, nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the Three-domain system, three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard (archaea), Asgard archaea. This implies that there are only Two-domain system, two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass (ecology), biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as Flagellated cell, flagellated phagotrophs. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamete
A gamete (; , ultimately ) is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproductive cells, also referred to as sex cells. In species that produce two morphologically distinct types of gametes, and in which each individual produces only one type, a female is any individual that produces the larger type of gamete—called an ovum— and a male produces the smaller type—called a sperm. Sperm cells or spermatozoa are small and motile due to the flagellum, a tail-shaped structure that allows the cell to propel and move. In contrast, each egg cell or ovum is relatively large and non-motile. In short a gamete is an egg cell (female gamete) or a sperm (male gamete). In animals, ova mature in the ovaries of females and sperm develop in the testes of males. During fertilization, a spermatozoon and ovum unite to form a new diploid organism. Gametes carry half the genetic information of an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flower Bouquet
A flower bouquet is a collection of flowers in a creative arrangement. Flower bouquets can be arranged for the decor of homes or public buildings, or may be handheld. Handheld bouquets are classified by several different popular shapes and styles, including nosegay, crescent, and cascading bouquets. Flower bouquets are often given for special occasions such as birthdays, anniversaries or funerals. They are also used extensively in weddings as well as Olympics Medal Ceremonies. Bouquets arranged in vases or planters for home decor can be arranged in either traditional or modern styles. Symbolism may be attached to the types of flowers used, according to the culture. History The arrangement of flowers for home or building decor has a long history throughout the world. The oldest evidence of formal arranging of bouquets in vases comes from ancient Egypt, and depictions of flower arrangements date to the Old Kingdom (~2500 BCE). The sacred lotus was often used, as were herbs, p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merozoite
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 org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cell Nucleus
The cell nucleus (pl. nuclei; from Latin or , meaning ''kernel'' or ''seed'') is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have no nuclei, and a few others including osteoclasts have many. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm; and the nuclear matrix, a network within the nucleus that adds mechanical support. The cell nucleus contains nearly all of the cell's genome. Nuclear DNA is often organized into multiple chromosomes – long stands of DNA dotted with various proteins, such as histones, that protect and organize the DNA. The genes within these chromosomes are structured in such a way to promote cell function. The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apicomplexan Life Cycle
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 or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
