|
Elisabeth Tschermak-Woess
Elisabeth Tschermak-Woess (28 January 1917 – 26 April 2001) was an Austrian University lecturer, cytologist, and phycologist who worked with lichen photobionts. In 1994, Tschermak-Woess was awarded the Acharius Medal for her lifetime contributions to lichenology. She had a ''Festschrift'' dedicated to her in 1988, in the journal ''Plant Systematics and Evolution'' (volume 158, pages 73–340). Lichen taxon, taxa that have been named after Tschermak-Woess include the genus ''Woessia'' and the species ''Asterochloris woessiae''. Biography Tschermak-Woess studied botany and chemistry at the University of Vienna. In 1948 she began her career as a cytologist with Lothar Geitler. From 1971 to 1985 she was a professor of botany (cytology and genetics) at the University of Vienna. Noted for her excellent technique with the light microscope, she discovered the presence of polytene chromosomes in plants. She published several studies about the interactions between mycobionts and phycobio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Znaim
Znojmo (; ) is a town in the South Moravian Region of the Czech Republic. It has about 34,000 inhabitants. Znojmo is the historical and cultural centre of southwestern Moravia and the second most populated town in the South Moravian Region. The historic centre of Znojmo is well preserved and is protected as an Cultural monument (Czech Republic)#Monument reservations, urban monument reservation. Administrative division Znojmo consists of nine municipal parts (in brackets population according to the 2021 census): *Znojmo (26,634) *Derflice (114) *Kasárna (158) *Konice (383) *Mramotice (397) *Načeratice (340) *Oblekovice (1,299) *Popice (187) *Přímětice (4,224) Etymology The origin of the town's name is uncertain. According to the most likely theories, it was derived either from the Old Czech words ''znoj'' (i.e. 'heat') and ''znojný'' ('exposed to heat'), or from the personal name Znojem or Znojim. Geography Znojmo is located about southwest of Brno, near the border with A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allium Paniculatum
''Allium paniculatum'', common name pale garlic, is a species of monocot in the family Amaryllidaceae. It is widely cultivated and is now naturalized in several places outside its native range. Description ''Allium paniculatum'' produces several egg-shaped bulbs, each up to 1.5 cm across. It has no rhizomes. Leaves are tubular and hollow, up to 35 cm long. Scape is round in cross-section, solid, up to 75 cm tall. Inflorescence is (despite the name of the species referring to a panicle) an umbel with as many as 100 flowers. Flowers are bell-shaped, about 6 mm across; tepals white to lilac; pollen and anthers yellow. Taxonomy ''A. paniculatum'' is placed within section ''Codonoprasum'', subgenus ''Allium''. The species has been regarded as highly variable, with up to 30 taxa included in what has been referred to as the ''A. paniculatum'' complex, many of which are now regarded as separate species within the section, including '' Allium dentiferum'', '' A. f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elliptochloris
''Elliptochloris'' is a genus of green algae in the order Prasiolales. Species of this genus are common and found in a variety of terrestrial habitats such as soils. Some species in the genus are partners in lichens. One species, '' E. marina'', is a symbiont within two species of sea anemone, '' Anthopleura elegantissima'' and '' A. xanthogrammica''. It seems to have a worldwide distribution. Description ''Elliptochloris'' consists of solitary cells which are spherical to ellipsoidal, or cylindrical or slightly curved. Cells contain a single parietal chloroplast A chloroplast () is a type of membrane-bound organelle, organelle known as a plastid that conducts photosynthesis mostly in plant cell, plant and algae, algal cells. Chloroplasts have a high concentration of chlorophyll pigments which captur ... which may be band-shaped, trough-shaped, hollow and spherical; the chloroplasts may be lobed or not, and with or without a pyrenoid. Cells contain a single cell nucle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dilabifilum
''Dilabifilum'' is a genus of thalloid green algae comprising approximately 4 species. The thalli take a crustose form. ''Choreonema'' reproduces by means of conceptacles; it produces tetraspores and dispores and carpospores. It is a source of agar Agar ( or ), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from " ogonori" and " tengusa". As found in nature, agar is a mixture of two components, t .... Species The species currently recognised are: '' Dilabifilum arthropyreniae'' and '' Dilabifilum prostratum''. References * Ulvophyceae genera Ulvales {{Ulvophyceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterochloris
''Asterochloris'' is a genus of green algae in the family Trebouxiophyceae. It is a common in lichen, occurring in the thalli of more than 20 lichen genera worldwide. ''Asterochloris'' is distinguishable from the morphologically similar genus ''Trebouxia'', primarily due to its deeply lobed chloroplast, the placement of the chloroplast along the cell's periphery before the initiation of zoospore or aplanospore formation, and its tendency to primarily reproduce asexually through the production of aplanospores. Taxonomy The genus was circumscribed in 1980 by Elisabeth Tschermak-Woess, with '' Asterochloris phycobiontica'' assigned as the type species. She differentiated it from the related genus ''Trebouxia'' by differences in chloroplast morphology. Later molecular research showed that ''Trebouxia'' was paraphyletic, and that some ''Trebouxia'' species were closely related to genus ''Asterochloris''. In 2010, Škaloud and Peksa proposed to split the genus ''Trebouxia'' and f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumscription (taxonomy)
In biological taxonomy, circumscription is the content of a taxon, that is, the delimitation of which subordinate taxa are parts of that taxon. For example, if we determine that species X, Y, and Z belong in genus A, and species T, U, V, and W belong in genus B, those are our circumscriptions of those two genera. Another systematist might determine that T, U, V, W, X, Y, and Z all belong in genus A. Agreement on circumscriptions is not governed by the Codes of Zoological or Botanical Nomenclature, and must be reached by scientific consensus. A goal of biological taxonomy is to achieve a stable circumscription for every taxon. This goal conflicts, at times, with the goal of achieving a natural classification that reflects the evolutionary history of divergence of groups of organisms. Balancing these two goals is a work in progress, and the circumscriptions of many taxa that had been regarded as stable for decades are in upheaval in the light of rapid developments in molecu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margalith Galun
Margalith Galun (; 21 February 1927 – 16 April 2012) was an Israeli lichenologist. She was a member of the Israel Academy of Sciences and Humanities and established the Israeli collection of lichens at Tel Aviv University. Founder of the academic journal ''Symbiosis'', she served as its editor-in-chief between 1985 and 2006. In 1994, she was awarded the Acharius Medal and in 1996 won the Meitner-Humboldt Prize, for her contributions to the field. The International Association for Lichenology grants an award which bears her name to honor scholarship at their quadrennial symposium. Early life Melitta Katz was born on 21 February 1927 in Vienna, Austria to Amalia (née Teitelbaum) and Arie Katz. Originally from Lviv, her father was a merchant and was involved in the Zionist and socialist movements. After completing her elementary school in Vienna and beginning her gymnasium studies, her family decided to immigrate in 1938. They were unsuccessful in leaving Austria and to get ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Systematics
Systematics is the study of the diversification of living forms, both past and present, and the relationships among living things through time. Relationships are visualized as evolutionary trees (synonyms: phylogenetic trees, phylogenies). Phylogenies have two components: branching order (showing group relationships, graphically represented in cladograms) and branch length (showing amount of evolution). Phylogenetic trees of species and higher taxa are used to study the evolution of traits (e.g., anatomical or molecular characteristics) and the distribution of organisms ( biogeography). Systematics, in other words, is used to understand the evolutionary history of life on Earth. The word systematics is derived from the Latin word of Ancient Greek origin '' systema,'' which means systematic arrangement of organisms. Carl Linnaeus used 'Systema Naturae' as the title of his book. Branches and applications In the study of biological systematics, researchers use the different br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiphytic
An epiphyte is a plant or plant-like organism that grows on the surface of another plant and derives its moisture and nutrients from the air, rain, water (in marine environments) or from debris accumulating around it. The plants on which epiphytes grow are called phorophytes. Epiphytes take part in nutrient cycles and add to both the diversity and biomass of the ecosystem in which they occur, like any other organism. In some cases, a rainforest tree's epiphytes may total "several tonnes" (several long tons). They are an important source of food for many species. Typically, the older parts of a plant will have more epiphytes growing on them. Epiphytes differ from parasites in that they grow on other plants for physical support and do not necessarily affect the host negatively. An organism that grows on another organism that is not a plant may be called an epibiont. Epiphytes are usually found in the temperate zone (e.g., many mosses, liverworts, lichens, and algae) or in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karyology
A karyotype is the general appearance of the complete set of chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is discerned by determining the chromosome complement of an individual, including the number of chromosomes and any abnormalities. A karyogram or idiogram is a graphical depiction of a karyotype, wherein chromosomes are generally organized in pairs, ordered by size and position of centromere for chromosomes of the same size. Karyotyping generally combines light microscopy and photography in the metaphase of the cell cycle, and results in a photomicrographic (or simply micrographic) karyogram. In contrast, a schematic karyogram is a designed graphic representation of a karyotype. In schematic karyograms, just one of the sister chromatids of each chromosome is generally shown for brevity, and in reality they are generally so close together that they look as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
