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Malmidea Leucopiperis
''Malmidea leucopiperis'' is a species of corticolous (bark-dwelling), crustose lichen in the family Malmideaceae. It is found in Brazil. Taxonomy The lichen was formally described as a new species in 2021 by the German lichenologist Klaus Kalb. The type specimen was collected from Itatiaia National Park (Rio de Janeiro) at an altitude of . The species epithet alludes to its resemblance to ''Malmidea piperis'', with a key difference in the 's colour—light greyish to beige compared to the dark brown in ''M. piperis''. Description ''Malmidea leucopiperis'' is a crustose lichen with a continuous thallus measuring 50–80 μm in thickness. Its surface is smooth and dull, appearing grey or greenish grey, and can turn orange-red when abraded. Neither isidia nor soralia (reproductive propagules) are present on this species. The medulla of the thallus is orange-red and has a K+ (purple) chemical spot test reaction. The of this species is , with cell dimensions of 6–8&nb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klaus Kalb
Klaus Kalb (born 1942) is a German lichenologist and an authority on tropical lichens. Born in Nuremberg, he studied at the University of Erlangen–Nuremberg before pursuing a career that significantly advanced the field of lichenology, particularly in Brazil. Kalb's work in São Paulo from 1978 to 1981 led to a collaboration with Brazilian lichenologist Marcelo Pinto Marcelli, which is considered a model for non-commercial benefit-sharing in taxonomic research. He later became an associate professor at the University of Regensburg and is known for editing the exsiccata series ''Lichenes Neotropici''. Kalb's contributions to lichenology include over 120 scientific publications, the description of numerous new species, and the development of a substantial lichen collection. His work has been recognised through various honours, including four lichen genera and numerous species named after him, as well as a Festschrift published in 2007 to mark his retirement. Biography Klaus K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spot Test (lichen)
A spot test in lichenology is a spot analysis used to help identify lichens. It is performed by placing a drop of a chemical reagent on different parts of the lichen and noting the colour change (or lack thereof) associated with application of the chemical. The tests are routinely encountered in dichotomous keys for lichen species, and they take advantage of the wide array of lichen products (secondary metabolites) produced by lichens and their uniqueness among taxa. As such, spot tests reveal the presence or absence of chemicals in various parts of a lichen. They were first proposed as a method to help identify species by the Finnish lichenologist William Nylander in 1866. Three common spot tests use either 10% aqueous KOH solution (K test), saturated aqueous solution of bleaching powder or calcium hypochlorite (C test), or 5% alcoholic ''p''-phenylenediamine solution (P test). The colour changes occur due to presence of particular secondary metabolites in the lichen. In ide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malmidea
''Malmidea'' is a genus of crustose lichens and the type genus of the family Malmideaceae. It was established in 2011 to contain a phylogenetically distinct group of species formerly placed in the genus ''Malcolmiella''. The crust-like thallus of ''Malmidea'' lichens has a surface that varies from smooth to rough, featuring textures such as (wart-like), (grainy), or (pimpled). These textures are often formed by , which are spherical clusters of green algal cells from the family Chlorococcaceae, encased in fungal hyphae. ''Malmidea'' comprises nearly 70 mostly tropical species that grow corticolous lichen, on bark, although a few grow foliicolous lichen, on leaves. Taxonomy Both the family Malmideaceae and the genus ''Malmidea'' were created in 2011 to accommodate a group of species, formerly placed in genus ''Malcolmiella'' (family Pilocarpaceae), that molecular phylogenetics showed to be a distinct lineage (evolution), lineage and worthy of recognition at the family level. Kla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sergipe
Sergipe (), officially State of Sergipe, is a States of Brazil, state of Brazil. Located in the Northeast Region, Brazil, Northeast Region along the Atlantic Ocean, Atlantic coast of the country, Sergipe is the smallest state in Brazil by geographical area at , larger only than the Federal District (Brazil), Federal District. Sergipe borders Bahia to the south and west and Alagoas to the north. Aracaju is the capital and the largest city in the state; the state is divided into 75 Municipalities of Brazil, municipalities. The state has 1.1% of the Brazilian population and produces only 0.6% of the Brazilian GDP. Geography As with most of the states in northeastern Brazil, inland Sergipe is almost entirely savanna (''caatinga''), and its coastline is characterized by mangroves, swamps and sandy beaches. A small strip of tropical rainforest runs down the coast. The São Francisco River forms its northern boundary, and the drainage of the northern part of the state is northward and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pernambuco
Pernambuco ( , , ) is a States of Brazil, state of Brazil located in the Northeast Region, Brazil, Northeast region of the country. With an estimated population of 9.5 million people as of 2024, it is the List of Brazilian states by population, seventh-most populous state of Brazil and with around 98,067.877 km2, it is the List of Brazilian states by area, 19th-largest in area among federative units of the country. It is also the sixth-most densely populated with around 92.37 people per km2. Its capital and largest city, Recife, is one of the most important economic and urban hubs in the country. Based on 2019 estimates, the Recife metropolitan area, Recife Metropolitan Region is seventh-most populous in the country, and the second-largest in Northeast Region, Brazil, northeastern Brazil. In 2015, the state had 4.4% of the national population and produced 2.8% of the national gross domestic product (GDP). The contemporary state inherits its name from the Captaincy of Pernambuco, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thin-layer Chromatography
Thin-layer chromatography (TLC) is a chromatography technique that separates components in non-volatile mixtures. It is performed on a TLC plate made up of a non-reactive solid coated with a thin layer of adsorbent material. This is called the stationary phase. The sample is deposited on the plate, which is eluted with a solvent or solvent mixture known as the mobile phase (or eluent). This solvent then moves up the plate via capillary action. As with all chromatography, some compounds are more attracted to the mobile phase, while others are more attracted to the stationary phase. Therefore, different compounds move up the TLC plate at different speeds and become separated. To visualize colourless compounds, the plate is viewed under UV light or is stained.Jork, H., Funk, W., Fischer, W., Wimmer, H. (1990): Thin-Layer Chromatography: Reagents and Detection Methods, Volume 1a, VCH, Weinheim, Testing different stationary and mobile phases is often necessary to obtain well-defined an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atranorin
Atranorin is a chemical substance produced by some species of lichen. It is a secondary metabolite belonging to a group of compounds known as depsides. Atranorin has analgesic, anti-inflammatory, antibacterial, antifungal, cytotoxic, antioxidant, antiviral, and immunomodulatory properties. In rare cases, people can have an allergic reaction Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include Allergic rhinitis, hay fever, Food allergy, food al ... to atranorin. References Further reading * * * * Polyphenols Lichen products {{organic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellipsoid
An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional Scaling (geometry), scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a Surface (mathematics), surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is characterized by either of the two following properties. Every planar Cross section (geometry), cross section is either an ellipse, or is empty, or is reduced to a single point (this explains the name, meaning "ellipse-like"). It is Bounded set, bounded, which means that it may be enclosed in a sufficiently large sphere. An ellipsoid has three pairwise perpendicular Rotational symmetry, axes of symmetry which intersect at a Central symmetry, center of symmetry, called the center of the ellipsoid. The line segments that are delimited on the axes of symmetry by the ellipsoid are called the ''principal ax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascus
An ascus (; : asci) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. '' Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. '' Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some '' Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrophobe
In chemistry, hydrophobicity is the chemical property of a molecule (called a hydrophobe) that is seemingly repelled from a mass of water. In contrast, hydrophiles are attracted to water. Hydrophobic molecules tend to be nonpolar and, thus, prefer other neutral molecules and nonpolar solvents. Because water molecules are polar, hydrophobes do not dissolve well among them. Hydrophobic molecules in water often cluster together, forming micelles. Water on hydrophobic surfaces will exhibit a high contact angle. Examples of hydrophobic molecules include the alkanes, oils, fats, and greasy substances in general. Hydrophobic materials are used for oil removal from water, the management of oil spills, and chemical separation processes to remove non-polar substances from polar compounds. The term ''hydrophobic''—which comes from the Ancient Greek (), "having a fear of water", constructed Liddell, H.G. & Scott, R. (1940). ''A Greek-English Lexicon. revised and augmented throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
