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Complex Oil Bodies
The oil bodies of liverworts, occasionally dubbed complex oil bodies for distinction, are unique organelles exclusive to the Marchantiophyta. They are markedly different from the Oil body, oil bodies found in other Embryophyte, land plants and algae in that they are membrane-bound, and not associated with food storage. The organelles are variable and present in an estimated 90% of liverwort species, often proving Taxonomy (biology), taxonomically relevant. As a whole, the formation and function of the organelles are poorly understood. Complex oil bodies are recognized as sites of Terpenoid, isoprenoid biosynthesis and essential oil accumulation, and have been implicated with anti-herbivory, desiccation tolerance, and photo-protection. Structure and content The oil bodies of liverworts are recognizable using Microscopy, light microscopy, and they were first officially described in 1834 by Huebener from the plant Mylia taylorii, ''Mylia'' ''taylorii''. They were noted as transpare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochila Asplenioides Oil Bodies
''Plagiochila'' is a large, common, and widespread genus of liverworts in the order Jungermanniales. It is a member of the family Plagiochilaceae within that order. There may be anywhere from 500 to 1300 species, most of them from the tropics; the exact number is still under revision. Biogeography The genus has a cosmopolitan distribution, found on every continent except Antarctica. There are 9 species of ''Plagiochila'' in Britain and Ireland, the majority of which have a hyper-oceanic biogeography, demanding high humidity afforded by proximity to the Atlantic. The most widespread representative of the hyper-oceanic species is ''Plagiochila spinulosa'', a common species of Atlantic woodlands known as temperate rainforest. There is a disjunct population of ''Plagiochila spinulosa'' in New Zealand. Taxonomy ''Plagiochila'' taxonomy is complex and disputed. Certain phylogenetic studies have shown that genetic distinctions between observed species are weak, suggesting rec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radula (plant)
''Radula'' is a genus of liverwort in the family Radulaceae. The genus includes 248 species of small plants that typically grow as green, scaly patches on tree trunks, logs, or rocks in moist environments. It is distinguished from other liverworts by several unique features, including the production of root-like structures (rhizoids) exclusively from leaf surfaces and characteristic branching patterns. The plants have rounded, overlapping leaves consisting of two unequal lobes, with considerable variation in structure across species. Following a major taxonomic revision in 2022, the genus comprises five subgenera with distributions ranging from tropical to temperate regions. The oldest known fossil species, ''R. cretacea'', found in Burmese amber, dates to the Cenomanian age, though molecular evidence suggests the genus originated in the Triassic period, around 228 million years ago. Taxonomy The genus ''Radula'' was historically subject to different taxonomic interpretatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiloscyphus
''Chiloscyphus'' is a genus of liverworts belonging to the family Lophocoleaceae. The genus has a cosmopolitan distribution. In 2010, John J. Engel published a monograph on the Australasian species in this genus. Species As accepted by GBIF; *'' Chiloscyphus acutus'' *'' Chiloscyphus alpicola'' *'' Chiloscyphus amplectens'' *'' Chiloscyphus angulatus'' *'' Chiloscyphus anisolobus'' *'' Chiloscyphus archeri'' *'' Chiloscyphus argenteus'' *'' Chiloscyphus armatistipulus'' *'' Chiloscyphus asperrimus'' *'' Chiloscyphus australis'' *'' Chiloscyphus austro-alpinus'' *'' Chiloscyphus banksianus'' *'' Chiloscyphus beecheyanus'' *''Chiloscyphus beesleyanus'' *'' Chiloscyphus belmoranus'' *'' Chiloscyphus bifidus'' *'' Chiloscyphus bowieanus'' *'' Chiloscyphus brasiliensis'' *''Chiloscyphus breviculus'' *''Chiloscyphus brevis'' *''Chiloscyphus brevistipulus'' *''Chiloscyphus bridelii'' *''Chiloscyphus ceylonensis'' *''Chiloscyphus cheesemanii'' *''Chiloscyphus c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoterpene
Monoterpenes are a class of terpenes that consist of two isoprene units and have the molecular formula C10H16. Monoterpenes may be linear (acyclic) or contain rings (monocyclic and bicyclic). Modified terpenes, such as those containing oxygen functionality or missing a methyl group, are called monoterpenoids. Monoterpenes and monoterpenoids are diverse. They have relevance to the pharmaceutical, cosmetic, agricultural, and food industries. Biosynthesis Monoterpenes are derived biosynthetically from units of isopentenyl pyrophosphate, which is formed from acetyl-CoA via the intermediacy of mevalonic acid in the HMG-CoA reductase pathway. An alternative, unrelated biosynthesis pathway of IPP is known in some bacterial groups and the plastids of plants, the so-called MEP-(2-methyl-D-erythritol-4-phosphate) pathway, which is initiated from C5 sugars. In both pathways, IPP is isomerized to DMAPP by the enzyme isopentenyl pyrophosphate isomerase. Geranyl pyrophosphate is the precu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diterpene
Diterpenes are a class of terpenes composed of four isoprene units, often with the molecular formula C20H32. They are biosynthesized by plants, animals and fungi via the HMG-CoA reductase pathway, with geranylgeranyl pyrophosphate being a primary intermediate. Diterpenes form the basis for biologically important Chemical compound, compounds such as retinol, retinal, and phytol. Some diterpenes are known to be antimicrobial and anti-inflammatory. Structures As with most terpenes a huge number of potential structures exists, which may be broadly divided according to the number of rings present. Biosynthesis Diterpenes are derived from the addition of one Isopentenyl pyrophosphate, IPP unit to Farnesyl pyrophosphate, FPP to form geranylgeranyl pyrophosphate (GGPP). From GGPP, structural diversity is achieved mainly by two classes of enzymes; the diterpene synthases and Cytochrome P450, cytochromes P450. Several diterpenes are produced by plants and cyanobacteria. GGPP is also t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capillary Action
Capillary action (sometimes called capillarity, capillary motion, capillary rise, capillary effect, or wicking) is the process of a liquid flowing in a narrow space without the assistance of external forces like Gravitation, gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube such as a Drinking straw, straw, in porous materials such as paper and plaster, in some non-porous materials such as clay and liquefied carbon fiber, or in a biological cell. It occurs because of intermolecular forces between the liquid and surrounding solid surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (which is caused by Cohesion (chemistry), cohesion within the liquid) and Adhesion, adhesive forces between the liquid and container wall act to propel the liquid. Etymology Capillary comes from the Latin word capillaris, meaning "of or resembling hair". The meaning stems from the tiny, hairl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micromanipulator
A micromanipulator is a device which is used to physically interact with a sample under a microscope, where a level of precision of movement is necessary that cannot be achieved by the unaided human hand. It may typically consist of an input joystick, a mechanism for reducing the range of movement and an output section with the means of holding a microtool to hold, inject, cut or otherwise manipulate the object as required. The mechanism for reducing the movement usually requires the movement to be free of backlash. This is achieved by the use of kinematic constraints to allow each part of the mechanism to move only in one or more chosen degrees of freedom, which achieves a high precision and repeatability of movement, usually at the expense of some absolute accuracy. Movement Movement reduction can be performed by mechanical levers, hydraulically using pistons of different diameters connected by tubing containing non-compressible fluid, electronically using stepper motors or lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesquiterpene
Sesquiterpenes are a class of terpenes that consist of three isoprene units and often have the molecular formula C15H24. Like monoterpenes, sesquiterpenes may be cyclic or contain rings, including many combinations. Biochemical modifications such as oxidation or rearrangement produce the related sesquiterpenoids. It is estimated (2006) that 3000 sesquiterpenes have been identified. Biosynthesis and examples The reaction of geranyl pyrophosphate with isopentenyl pyrophosphate results in the 15-carbon farnesyl pyrophosphate (FPP), which is an intermediate in the biosynthesis of sesquiterpenes such as farnesene. Cyclic sesquiterpenes are more common than cyclic monoterpenes because of the increased chain length and additional double bond in the sesquiterpene precursors. In addition to common six-membered ring systems such as the ones found in zingiberene and bisacurone, cyclization of one end of the chain to the other end can lead to macrocyclic rings such as humulene. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marchantia Polymorpha
''Marchantia polymorpha'' is a species of large thalloid liverwort in the class Marchantiopsida. ''M. polymorpha'' is highly variable in appearance and contains several subspecies. This species is dioicous, having separate male and female plants. ''M. polymorpha'' has a wide distribution and is found worldwide.Matthews, Robin F. 1993. Marchantia polymorpha. In: Fire Effects Information System, nline U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/bryophyte/marpol/all.html 017, December 8 Common names include common liverwort or umbrella liverwort. Distribution ''Marchantia polymorpha'' subsp. ''ruderalis'' has a circumpolar boreo-arctic cosmopolitan distribution, found worldwide on all continents except Antarctica. Habitat ''Marchantia polymorpha'' grows on shaded moist soil and rocks in damp habitats such as the banks of streams and pools, bogs, fens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enzyme
An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different molecules known as product (chemistry), products. Almost all metabolism, metabolic processes in the cell (biology), cell need enzyme catalysis in order to occur at rates fast enough to sustain life. Metabolic pathways depend upon enzymes to catalyze individual steps. The study of enzymes is called ''enzymology'' and the field of pseudoenzyme, pseudoenzyme analysis recognizes that during evolution, some enzymes have lost the ability to carry out biological catalysis, which is often reflected in their amino acid sequences and unusual 'pseudocatalytic' properties. Enzymes are known to catalyze more than 5,000 biochemical reaction types. Other biocatalysts include Ribozyme, catalytic RNA molecules, also called ribozymes. They are sometimes descr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthelia (plant)
Antheliaceae is a monotypic liverwort family in the order Jungermanniales. It contains a single genus, ''Anthelia''. Most species are found in the Northern hemisphere, with only a few species found in the southern hemisphere. Species According to GBIF The Global Biodiversity Information Facility (GBIF) is an international organisation that focuses on making scientific data on biodiversity available via the Internet using web services. The data are provided by many institutions from around the ...; * '' Anthelia africana'' * '' Anthelia andina'' * '' Anthelia asperifolia'' * '' Anthelia julacea'' * '' Anthelia juratzkana'' * '' Anthelia subaequifolia'' * '' Anthelia viridissima'' References External links Jungermanniales Jungermanniales genera {{Bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terpenoid
The terpenoids, also known as isoprenoids, are a class of naturally occurring organic compound, organic chemicals derived from the 5-carbon compound isoprene and its derivatives called terpenes, diterpenes, etc. While sometimes used interchangeably with "terpenes", terpenoids contain additional functional groups, usually containing oxygen. When combined with the hydrocarbon terpenes, terpenoids comprise about 80,000 compounds. They are the largest class of plant secondary metabolites, representing about 60% of known Natural Products, natural products. Many terpenoids have substantial pharmacological bioactivity and are therefore of interest to medicinal chemists. Plant terpenoids are used for their aromatic qualities and play a role in traditional herbal remedies. Terpenoids contribute to the scent of eucalyptus, the flavors of cinnamon, cloves, and ginger, the yellow color in sunflowers, and the red color in tomatoes. Well-known terpenoids include citral, menthol, camphor, salvin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
