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Drachiella (alga)
''Drachiella'' is a genus of marine red alga. It has scaly thickenings; also " rhizoids fringing openings". It is found below the kelp zone in areas exposed to moderate wave action; it is iridescent, and consists of a short, narrow stipe broadening into midribless thalli which reach 7 cm in length. ''Drachiella'' exhibits diffuse intercalary Intercalation may refer to: *Intercalation (chemistry), insertion of a molecule (or ion) into layered solids such as graphite *Intercalation (timekeeping), insertion of a leap day, week or month into some calendar years to make the calendar follo ... and marginal growth, and rhizoids are common along the margins, which it uses for anchorage. Pit connections often link adjoining cells. Distribution '' Drachiella spectabilis'' has been recorded from Inistrahull in Ireland.Morton, O. 2003. The marine macroalgae of County Donegal, Ireland. ''Bull. Ir. Biogeog. Soc.'' no. 27:3 - 164 References {{Taxonbar, from=Q5304627 Red alg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean Feldmann
Jean Feldmann (1905–1978) was a French biologist, specialising in marine algae. Biography Jean Feldmann was born on 25 June 1905 in Paris. He initially studied pharmacy, gaining his first degree in 1929, before turning his attentions to marine algae. In 1933, he took up a position as an assistant at the University of Algiers, where he also completed his doctorate in 1937, married his assistant, Geneviève Mazoyer, in 1938, and rose to professor in 1948. The couple moved to Paris when Jean took up a position at the institution that became the Université Pierre et Marie Curie, where they remained until his retirement in 1976. He died suddenly on 18 September 1978. Work Feldmann published around 220 scientific works, mostly on marine algae, but also covering various fungi, mosses, freshwater algae and flowering plants. Feldmann strongly believed in international scientific co-operation and, as well as co-founding the Société Phycologique de France in 1955, strongly advocated the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midrib
This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary of leaf morphology. For other related terms, see Glossary of phytopathology, Glossary of lichen terms, and List of Latin and Greek words commonly used in systematic names. A B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ireland
Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Great Britain and Ireland), North Channel, the Irish Sea, and St George's Channel. Ireland is the List of islands of the British Isles, second-largest island of the British Isles, the List of European islands by area, third-largest in Europe, and the List of islands by area, twentieth-largest on Earth. Geopolitically, Ireland is divided between the Republic of Ireland (officially Names of the Irish state, named Ireland), which covers five-sixths of the island, and Northern Ireland, which is part of the United Kingdom. As of 2022, the Irish population analysis, population of the entire island is just over 7 million, with 5.1 million living in the Republic of Ireland and 1.9 million in Northern Ireland, ranking it the List of European islan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inistrahull
Inishtrahull ( ga, Inis Trá Tholl, possibly "island of the empty beach" or "island of the yonder beach") is the most northerly island of Ireland. It has an area of and lies about northeast of Malin Head, County Donegal. The most northerly landfall of Ireland, the Tor Beg rock, is another kilometre to the north. Inishtrahull is home to Ireland's northernmost lighthouse. The island had a resident community until 1929 and the lighthouse was staffed until 1987. Today it is uninhabited and has been designated a protected area due to its wildlife. Geology The island is formed of a granitic gneiss, a type of metamorphic rock, which is known as Inishtrahull Gneiss. It is dated at 1.7 billion years old, making it Paleoproterozoic in age, and is the oldest known rock on the Irish Islands. The Inishtrahull Gneiss is considered to form part of the Rhinns complex that is also exposed on the islands of Islay and Colonsay. The Rhinns complex is correlated with the Ketilidian metam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pit Connection
In algal anatomy, a pit connection is a hole in the septum between two algal cells, and is found only in the red algae − specifically, all orders except the Porphyridiales and haploid Bangiales. They are often stoppered with proteinaceous "pit plugs". By contrast, many fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ... (only ascomycetes and basidiomycetes, as most other groups lack septa) contain septal pores − an unrelated phenomenon. Characteristics A sieve-like membrane may cover the pit in living algae, but in the majority of algae a plug forms, they likely limit the transfer of metabolites between neighbouring cells. Formation Primary pit connections are formed between cells in the same filament, derived from the same parent cell by its division. Such connections ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intercalary
Intercalation may refer to: *Intercalation (chemistry), insertion of a molecule (or ion) into layered solids such as graphite *Intercalation (timekeeping), insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons *Intercalation (university administration), period when a student is officially given time off from studying for an academic degree *Intercalation (geology), a special form of interbedding, where two distinct depositional environments in close spatial proximity migrate back and forth across the border zone *Intercalary chapter, a chapter in a novel that does not further the plot. See also frame story (sometimes called intercalation). * In biology: ** Intercalary segment, an appendage-less segment in the segmental composition of the heads of insects and Myriapoda **Intercalation (biochemistry), process discovered by Leonard Lerman by which certain drugs and mutagens insert themselves between base pairs of DNA **Intercalated cel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalli
Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms were previously known as the thallophytes, a polyphyletic group of distantly related organisms. An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the tissues into organs. Even though thalli do not have organized and distinct parts (leaves, roots, and stems) as do the vascular plants, they may have analogous structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has vascular tissue. In exceptional cases such as the Lemnoideae, where t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stipe (botany)
In botany, a stipe is a stalk that supports some other structure. The precise meaning is different depending on which taxonomic group is being described. file:Helicteres-Yucatán-Flowers.jpg, The long stipe of a '' Helicteres'' flower. file:Helicteres-Yucatán-Fruits.jpg, remains as each flower forms a fruit. In the case of ferns, the stipe is only the petiole from the rootstock to the beginning of the leaf tissue, or lamina. The continuation of the structure within the lamina is then termed a rachis. In flowering plants, the term is often used in reference to a stalk that sometimes supports a flower's ovary. In orchids, the stipe or caudicle is the stalk-like support of the pollinia. It is a non-viscid band or strap connecting the pollinia with the viscidium (the viscid part of the rostellum or beak). A stipe is also a structure found in organisms that are studied by botanists but that are no longer classified as plants. It may be the stem-like part of the thallus of a mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halymenia
''Halymenia'' a genus of a macroscopic red algae that grows in oceans worldwide. Species have been found in cold temperate areas but the highest diversity is found in warm temperate and tropical regions. For example, 41 names have been reported for the Indo-Pacific (Guiry & Guiry, 2011). Silva et al. (1996) listed 22 names (including two varieties) for the Indian Ocean. Species It includes the following species: *'' Halymenia abyssicola'' E.Y.Dawson *'' Halymenia actinophysa'' M.A.Howe *'' Halymenia angusta'' (J.Agardh) De Toni *'' Halymenia asymmetrica'' Gargiulo, de Masi & Tripodi *'' Halymenia bifida'' E.Y.Dawson *'' Halymenia brasiliana'' S.M.P.B.Guimarães & M.T.Fujii *'' Halymenia californica'' G.M.Smith & Hollenberg *'' Halymenia carnosa'' *''Halymenia cerratei'' C.O.Acleto *''Halymenia chiangiana'' I.A.Abbott & Kraft *'' Halymenia clathrata'' E.C.Oliveira, Pinheiro-Vieira & R.E.Norris *''Halymenia cromwellii'' I.A.Abbott *'' Halymenia curvicornis'' J.Agardh *''Halymenia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridescent
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. It is a kind of structural coloration that is due to wave interference of light in microstructures or thin films. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint finishes, usually in the automotive industry, which actually produce iridescent effects. Etymology The word ''iridescence'' is derived in part from the Greek word ἶρις ''îris'' ( gen. ἴριδος ''íridos''), meaning ''rainbow'', and is combined with the Latin suffix ''-escent'', meaning "having a tendency toward". Iris in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wave Action
In fluid dynamics, a wind wave, water wave, or wind-generated water wave, is a surface wave that occurs on the free surface of bodies of water as a result from the wind blowing over the water surface. The contact distance in the direction of the wind is known as the ''fetch''. Waves in the oceans can travel thousands of kilometers before reaching land. Wind waves on Earth range in size from small ripples, to waves over high, being limited by wind speed, duration, fetch, and water depth. When directly generated and affected by local wind, a wind wave system is called a wind sea. Wind waves will travel in a great circle route after being generated – curving slightly left in the southern hemisphere and slightly right in the northern hemisphere. After moving out of the area of fetch, wind waves are called '' swells'' and can travel thousands of kilometers. A noteworthy example of this is waves generated south of Tasmania during heavy winds that will travel across the Pacif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
