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Protothelenella Polytrichi
''Protothelenella'' is a genus of fungi in the family Protothelenellaceae. It contains 11 species, some of which form lichens. ''Protothelenella'' species have a crustose thallus with spherical to pear-shaped, dark brown to blackish . Microscopic characteristics of the genus include asci with an amyloid , and that are colourless and contain multiple internal partitions. Some species grow on acidic including rocks, soil, bryophytes, plant detritus or rotten wood. Other species are lichenicolous (lichen-dwelling), growing on species of '' Solorina'', '' Peltigera'', '' Pseudocyphellaria'', or '' Cladonia''. Taxonomy The genus was circumscribed by Finnish lichenologist Veli Räsänen in 1943, with ''Protothelenella reducta'' assigned as the type species. The genus ''Thelenella'' is similar in some aspects, but differs in the negative iodine staining of its ascus and hymenial gel. A molecular phylogenetics analysis of three ''Protothelenella'' species suggested that the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veli Räsänen
Veli Johannes Paavo Bartholomeus Räsänen (24 August 1888 – 16 July 1953) was a Finnish lichenologist. Early life and education Veli Räsänen was born on 24 August 1888 in Simo, Finland. Räsänen's brother was the linguist Martti Räsänen Arvo Martti Oktavianus Räsänen (June 25, 1893 – September 7, 1976) was a Finnish linguist and turkologist. He operated as a docent of turkology at University of Helsinki from 1926 forwards, and as an additional professor of Turkic philology fr .... His parents were primary school teachers Antti Räsänen, and Kaisa Sofia Vuolevi. He took his matriculation examination in 1909 in Oulu, and graduated with a Bachelor of Arts in 1913, a master's degree in 1914 and a Licentiate (degree), licentiate and doctorate in 1927 from the University of Helsinki. Räsänen worked at the Lapua agricultural lyceum for teachers from 1918 to 1921 teaching natural sciences and animal husbandry. He was an instructor in the Agricultural School (), as a l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staining
Staining is a technique used to enhance contrast in samples, generally at the microscopic level. Stains and dyes are frequently used in histology (microscopic study of biological tissues), in cytology (microscopic study of cells), and in the medical fields of histopathology, hematology, and cytopathology that focus on the study and diagnoses of diseases at the microscopic level. Stains may be used to define biological tissues (highlighting, for example, muscle fibers or connective tissue), cell populations (classifying different blood cells), or organelles within individual cells. In biochemistry, it involves adding a class-specific ( DNA, proteins, lipids, carbohydrates) dye to a substrate to qualify or quantify the presence of a specific compound. Staining and fluorescent tagging can serve similar purposes. Biological staining is also used to mark cells in flow cytometry, and to flag proteins or nucleic acids in gel electrophoresis. Light microscopes are used for viewin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xylaria
''Xylaria'' is a genus of Ascomycota, ascomycetous fungi commonly found growing on Coarse woody debris, dead wood. The name comes from the Greek (language), Greek ''xýlon'' meaning ''wood'' (see xylem). Two of the common species of the genus are ''Xylaria hypoxylon'' and ''Xylaria polymorpha''. ''Xylaria hypoxylon'', known by the common names stag's horn and candle-snuff fungus, is the most conspicuous because of its erect, 3–7 cm tall, antler-like ascocarps (fruitbodies) which are black at the base (where the perithecia are embedded) but white and branched towards the top, where the fruiting bodies produce white conidia (asexual spores). ''Xylaria polymorpha'', dead man's fingers, often grows in finger-like clusters from the base of a tree or from wood just below ground level. This is a primary fungus utilized in the spalting of sugar maple and other hardwoods. ''Xylaria longipes'', known by the common name dead moll's fingers, allegedly improves the quality of the woo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iodine
Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a violet gas at . The element was discovered by the French chemist Bernard Courtois in 1811 and was named two years later by Joseph Louis Gay-Lussac, after the Ancient Greek 'violet-coloured'. Iodine occurs in many oxidation states, including iodide (I−), iodate (), and the various periodate anions. It is the least abundant of the stable halogens, being the sixty-first most abundant element. As the heaviest essential mineral nutrient, iodine is required for the synthesis of thyroid hormones. Iodine deficiency affects about two billion people and is the leading preventable cause of intellectual disabilities. The dominant producers of iodine today are Chile and Japan. Due to its high atomic number and ease of attachment to organic compound ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
