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Paradoxia
''Paradoxia'' is a genus of microscopic green algae, in the family Coccomyxaceae. It is found in freshwater habitats as phytoplankton worldwide, but species are rare. Description ''Paradoxia'' consists of individual cells or pairs of cells. Individual cells are club-shaped or fusiform in outline, 18–45 μm long and 3–8 μm wide. When paired, the two cells are joined at the base by spines or leaf-like appendages that twist together. These leaf-like appendages have many fine curved ridges on one face. The cell wall is smooth and covered with thin spines up to 24 μm long. Cells are uninucleate (i.e. with one nucleus) and one chloroplast containing a single pyrenoid. Reproduction occurs asexually via the formation of autospores or zoospores which form a coenobium while still in the mother cell wall. Resting spores have also been reported. Sexual reproduction has not been observed in this genus. ''Paradoxia'' species are distinguished by the morphology of the cells, and whet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coccomyxaceae
Coccomyxaceae is a family of algae, in the class Trebouxiophyceae. Members of the family Coccomyxaceae are microscopic algae found often in colonies surrounded by mucilage. Sexual reproduction has not been observed in this family. Cells multiply by simple vegetative division, sometimes by forming autospores, but not zoospores. The genus ''Paradoxia'' produces zoospores; its placement in Coccomyxaceae is apparently due to a strain labeled as ''Paradoxia multiseta'' in the UTEX-Austin culture collection which was found to have a close phylogenetic relationship to ''Coccomyxa ''Coccomyxa'' is a genus of green algae in the family Coccomyxaceae. This genus is defined by their small, elliptical to spherical shape, and the presence of a simple parietal chloroplast. These features, along with their occurrence in various l ...''. However, the morphology of the strain (having spherical cells) does not appear to match that of ''Paradoxia'', making the identity suspect. References Ext ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Reproduction
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete ( haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes ( diploid). This is typical in animals, though the number of chromosome sets and how that number changes in sexual reproduction varies, especially among plants, fungi, and other eukaryotes. In placental mammals, sperm cells exit the penis through the male urethra and enter the vagina during copulation, while egg cells enter the uterus through the oviduct. Other vertebrates of both sexes possess a cloaca for the release of sperm or egg cells. Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. Sexual reproduction also occurs in some unicellular eukaryotes. Sexual reproduction does not occur in pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trebouxiophyceae
The Trebouxiophyceae, also known as trebouxiophytes, are a class of green algae, in the division Chlorophyta. Members of this class are single-celled, colonial, or multicellular and are found in freshwater, terrestrial or marine habitats worldwide. Many taxa in the Trebouxiophyceae form symbiotic relationships with other organisms; in particular, the majority of phycobionts within lichens are trebouxiophytes. A number of taxa have also lost the ability to photosynthesize, and have evolved to become parasitic; examples include '' Prototheca'' and '' Helicosporidium''. Trebouxiophyceae was originally defined by ultrastructural characteristics, but is now generally circumscribed based on phylogenetics, particularly based on the 18S rDNA locus. As of 2024, Trebouxiophyceae contains 211 genera and about 925 species. Morphology Members of the Trebouxiophyceae are microscopic or macroscopic organisms which exist in a variety of forms: non-flagellate coccoid or elliptical single cells ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coccomyxa
''Coccomyxa'' is a genus of green algae in the family Coccomyxaceae. This genus is defined by their small, elliptical to spherical shape, and the presence of a simple parietal chloroplast. These features, along with their occurrence in various lifestyles such as free-living, parasitic, or as , have been used to identify more than 40 species. Using additional morphological features, such as brown akinetes formation, allows for the differentiation between ''Coccomyxa'' and the genus ''Pseudococcomyxa'', as they tend to share some morphological characteristics like the general cell shape and one-sided mucilage cap. Recent molecular analysis, however, indicates that the genus ''Pseudococcomyxa'' is contained within different ''Coccomyxa'' clades, signaling the fact that the two genera are the same. ''Coccomyxa'' has often been used as a model organism, and its genome is being completely sequenced. The genus is also an attractive candidate for biofuels. Etymology ''Coccomyxa'' is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetic
In biology, phylogenetics () is the study of the evolutionary history of life using observable characteristics of organisms (or genes), which is known as phylogenetic inference. It infers the relationship among organisms based on empirical data and observed heritable traits of DNA sequences, protein amino acid sequences, and morphology. The results are a phylogenetic tree—a diagram depicting the hypothetical relationships among the organisms, reflecting their inferred evolutionary history. The tips of a phylogenetic tree represent the observed entities, which can be living taxa or fossils. A phylogenetic diagram can be rooted or unrooted. A rooted tree diagram indicates the hypothetical common ancestor of the taxa represented on the tree. An unrooted tree diagram (a network) makes no assumption about directionality of character state transformation, and does not show the origin or "root" of the taxa in question. In addition to their use for inferring phylogenetic pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Culture Collection
A microbiological culture, or microbial culture, is a method of multiplying microbial organisms by letting them reproduce in predetermined culture medium under controlled laboratory conditions. Microbial cultures are foundational and basic diagnostic methods used as research tools in molecular biology. The term ''culture'' can also refer to the microorganisms being grown. Microbial cultures are used to determine the type of organism, its abundance in the sample being tested, or both. It is one of the primary diagnostic methods of microbiology and used as a tool to determine the cause of infectious disease by letting the agent multiply in a predetermined medium. For example, a throat culture is taken by scraping the lining of tissue in the back of the throat and blotting the sample into a medium to be able to screen for harmful microorganisms, such as ''Streptococcus pyogenes'', the causative agent of strep throat. Furthermore, the term culture is more generally used informally t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Texas At Austin
The University of Texas at Austin (UT Austin, UT, or Texas) is a public university, public research university in Austin, Texas, United States. Founded in 1883, it is the flagship institution of the University of Texas System. With 53,082 students as of fall 2023, it is also the largest institution in the system. The university is a major center for academic research, with research expenditures totaling $1.06 billion for the 2023 fiscal year. It joined the Association of American Universities in 1929. The university houses seven museums and seventeen libraries, including the Lyndon Baines Johnson Library and Museum, Lyndon B. Johnson Presidential Library and the Blanton Museum of Art, and operates various auxiliary research facilities, such as the J. J. Pickle Research Campus and McDonald Observatory. UT Austin's athletics constitute the Texas Longhorns. The Longhorns have won four NCAA Division I National Football Championships, six NCAA Division I National Baseball Champions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Characiaceae
Characiaceae is a family of green algae in the order Sphaeropleales. It contains epiphytic or planktonic algae that are unicellular or colonial. The cells are heteropolar, with basal and apical ends having different shapes. The daughter cells are often retained in the cell wall of the old mother cell, whose cell wall becomes gelatinized. Taxonomy The taxonomy of Characiaceae has undergone significant revision in the last century. Characiaceae once included genera such as '' Schroederia'', but that circumscription made the family polyphyletic, so many of those genera have been transferred to other families. However, the taxonomic affiliation of the type species of the genus ''Characium'' (''C. sieboldii'') is still unclear, which necessitates further revision of the family. , AlgaeBase AlgaeBase is a global species database of information on all groups of algae, both seaweed, marine and freshwater algae, freshwater, as well as sea-grass. History AlgaeBase began in March 1996, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bohuslav Fott
Bohuslav (, ; ) is a city on the Ros River in Obukhiv Raion, Kyiv Oblast, Ukraine. It hosts the administration of Bohuslav urban hromada, one of the hromadas of Ukraine. Population: 17,135 (2001). It is known as Boslov by some of its Yiddish speaking residents and Boguslav (by the Russophones). History The city's year of establishment and source of name is uncertain. It is mentioned by Hypatian Codex as early as 1032 which is assumed as the year of its foundation. In official documents it is mentioned in 1195 when Bohuslavl was handed over by the Grand Prince of Kyiv Rurik II to the Grand Prince of Vladimir-Suzdal Vsevolod III who preceded him on Kyivan throne several years earlier. In 1240 Bohuslav was destroyed by the Mongol invasion. In 1362 it was liberated by forces of the Grand Duchy of Lithuania, Ruthenia and Samogitia. In 1569 Bohuslav was passed to the Polish Crown and in 1620 received its Magdeburg rights and city banner. Since 1591 Bohuslav belonged to Janusz Os ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jiří Komárek
Jiří (; ''YI-RZHEE'') is a Czech masculine given name, equivalent to English George. Notable people with the name include: B *Georg Benda (Jiří Antonín Benda), Czech composer, violinist and Kapellmeister *Jiří Baborovský, Czech physical chemist *Jiří Barta, Czech animator and director *Jiří Bartoška, Czech actor * Jiří Bicek, Slovak ice hockey player * Jiří Bobok, Czech footballer *Jiří Bubla, Czech ice hockey player * Jiří Buquoy, Czech aristocrat, mathematician and inventor *Jiří Bělohlávek, Czech conductor *Jiří Brdečka, Czech writer, artist and film director C * Jiří Čeřovský, Czech regional politician and former athlete *Jiří Čunek, Czech politician *Jiří Crha, Czech ice hockey player D * Jiří Dopita, Czech ice hockey player * Jiří Družecký (1745–1819), Bohemian-born Austrian composer and timpanist *Jiří Dudáček, Czech ice hockey player * Jiří Džmura, Czech bobsledder F *Jiří Fischer, Czech ice hockey player ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
