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Rolf Nordhagen (botanist)
Rolf Nordhagen (21 October 1894 – 8 March 1979) was a Norwegian botanist. His greatest scientific efforts were in the area of plant sociology. Personal life Rolf Nordhagen was born in Kristiania as a son of artist Johan Nordhagen (1856–1956) and Christine Magdalene, née Johansen (1858–1933). He was a brother of Olaf Nordhagen and Martha Gladtved-Prahl. In August 1925 in Oslo he married Elisabeth Marie Myhre (1900–1979). He was the father of art historian Per Jonas Nordhagen (born 1929) and computer scientist, Rolf Nordhagen (1927–2013). Career He finished his secondary education at Kristiania Cathedral School in 1912 and took the cand.real. degree in 1918. He worked as an assistant in the Botanical Garden in Kristiania from 1915 to 1920, was a research fellow at the Royal Frederick University from 1920 to 1925 and took the dr.philos. degree in 1922 on the thesis ''Kalktufstudier i Gudbrandsdalen'', about limestone tuff. He was a teacher at the Norwegian College o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuff
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, ''tuffaceous sandstone''). Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Because it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the ''moai'' statues on Easter Island. Tuff can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms. Tuff is often erroneously called tufa in guidebooks and in television programmes. Volcanic ash The material that is expelled in a volcanic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pastures
Pasture (from the Latin ''pastus'', past participle of ''pascere'', "to feed") is land used for grazing. Pasture lands in the narrow sense are enclosed tracts of farmland, grazed by domesticated livestock, such as horses, cattle, sheep, or swine. The vegetation of tended pasture, forage, consists mainly of grasses, with an interspersion of legumes and other forbs (non-grass herbaceous plants). Pasture is typically grazed throughout the summer, in contrast to meadow which is ungrazed or used for grazing only after being mown to make hay for animal fodder. Pasture in a wider sense additionally includes rangelands, other unenclosed pastoral systems, and land types used by wild animals for grazing or browsing. Pasture lands in the narrow sense are distinguished from rangelands by being managed through more intensive agricultural practices of seeding, irrigation, and the use of fertilizers, while rangelands grow primarily native vegetation, managed with extensive practices like co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sikkilsdalen
Sikkilsdalen is a valley in Nord-Fron municipality in Innlandet county, Norway. The valley is located in the eastern part of the Jotunheimen mountains, about to the southwest of the town of Otta, Norway, Otta. The valley is surrounded by several notable mountains including Heimdalshøe, Sikkilsdalshøa, Gravdalsknappen, and Ingulssjøhøi. The Sikkilsdalen valley is used as Grazing, grazing land for horses in the summer. The Royal Mountain Chalet, Prinsehytta, belonging to the Norwegian Royal Family is located in Sikkilsdalen. References Jotunheimen Nord-Fron Valleys of Innlandet {{Innlandet-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norwegian Academy Of Science And Letters
The Norwegian Academy of Science and Letters ( no, Det Norske Videnskaps-Akademi, DNVA) is a learned society based in Oslo, Norway. Its purpose is to support the advancement of science and scholarship in Norway. History The Royal Frederick University in Christiania was established in 1811. The idea of a learned society in Christiania surfaced for the first time in 1841. The city of Trondhjem had no university, but had a learned society, the Royal Norwegian Society of Sciences and Letters, established in 1760. The purpose of a learned society in Christiania was to support scientific studies and aid publication of academic papers. The idea of the Humboldt-inspired university, where independent research stood strong, had taken over for the instrumental view of a university as a means to produce civil servants. The city already had societies for specific professions, for instance the Norwegian Medical Society which was founded in 1833. However, these societies were open for both acad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sylane
Sylan (Norwegian), Sylarna (Swedish), or Bealjehkh (Southern Sami) is a mountain range on the border between Norway and Sweden. The mountain range lies in Trøndelag and Jämtland counties. The central part of the range includes a large mountain ridge that starts at the tall mountain ''Lillsylen'' in the north then heading south to the tall Storsylen (the highest point in the mountain range), and further south to the tall mountain Storsola. Traversing the ridge is a popular trip for experienced hikers, and is easiest from the south to the north, due to a scrambling point about south of the Storsylen summit. There are a number of mountain cabins in the area. The Norwegian Trekking Association maintains the tourist huts Schultzhytta in Roltdalen, Storerikvollen and Nedalshytta by Nesjøen. On the Swedish side the Swedish Tourist Association maintains the tourist huts Blåhammarens Fjällstation, Sylarnas Fjällstation and Helags Fjällstation. The mountain has a number of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ethnology
Ethnology (from the grc-gre, ἔθνος, meaning 'nation') is an academic field that compares and analyzes the characteristics of different peoples and the relationships between them (compare cultural anthropology, cultural, social anthropology, social, or sociocultural anthropology). Scientific discipline Compared to ethnography, the study of single groups through direct contact with the culture, ethnology takes the research that ethnographers have compiled and then compares and contrasts different cultures. The term ''ethnologia'' (''ethnology'') is credited to Adam František Kollár, Adam Franz Kollár (1718-1783) who used and defined it in his ''Historiae ivrisqve pvblici Regni Vngariae amoenitates'' published in Vienna in 1783. as: “the science of nations and peoples, or, that study of learned men in which they inquire into the origins, languages, customs, and institutions of various nations, and finally into the fatherland and ancient seats, in order to be able be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philology
Philology () is the study of language in oral and writing, written historical sources; it is the intersection of textual criticism, literary criticism, history, and linguistics (with especially strong ties to etymology). Philology is also defined as the study of literary texts as well as oral and written records, the establishment of their authenticity and their original form, and the determination of their meaning. A person who pursues this kind of study is known as a philologist. In older usage, especially British, philology is more general, covering comparative linguistics, comparative and historical linguistics. Classical philology studies classical languages. Classical philology principally originated from the Library of Pergamum and the Library of Alexandria around the fourth century BC, continued by Greeks and Romans throughout the Roman Empire, Roman/Byzantine Empire. It was eventually resumed by European scholars of the Renaissance humanism, Renaissance, where it was s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytogeography
Phytogeography (from Greek φυτόν, ''phytón'' = "plant" and γεωγραφία, ''geographía'' = "geography" meaning also distribution) or botanical geography is the branch of biogeography that is concerned with the geographic distribution of plant species and their influence on the earth's surface. Phytogeography is concerned with all aspects of plant distribution, from the controls on the distribution of individual species ranges (at both large and small scales, see species distribution) to the factors that govern the composition of entire communities and floras. Geobotany, by contrast, focuses on the geographic space's influence on plants. Fields Phytogeography is part of a more general science known as biogeography. Phytogeographers are concerned with patterns and process in plant distribution. Most of the major questions and kinds of approaches taken to answer such questions are held in common between phyto- and zoogeographers. Phytogeography in wider sense (or geobot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytosociology
Phytosociology, also known as phytocoenology or simply plant sociology, is the study of groups of species of plant that are usually found together. Phytosociology aims to empirically describe the vegetative environment of a given territory. A specific community of plants is considered a social unit, the product of definite conditions, present and past, and can exist only when such conditions are met. In phyto-sociology, such a unit is known as a phytocoenosis (or phytocoenose). A phytocoenosis is more commonly known as a plant community, and consists of the sum of all plants in a given area. It is a subset of a biocoenosis, which consists of all organisms in a given area. More strictly speaking, a phytocoenosis is a set of plants in area that are interacting with each other through competition or other ecological processes. Coenoses are not equivalent to ecosystems, which consist of organisms and the physical environment that they interact with. A phytocoensis has a distribution whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytomorphology
Phytomorphology is the study of the physical form and external structure of plants.Raven, P. H., R. F. Evert, & S. E. Eichhorn. ''Biology of Plants'', 7th ed., page 9. (New York: W. H. Freeman, 2005). . This is usually considered distinct from plant anatomy, which is the study of the internal structure of plants, especially at the microscopic level. Plant morphology is useful in the visual identification of plants. Recent studies in molecular biology started to investigate the molecular processes involved in determining the conservation and diversification of plant morphologies. In these studies transcriptome conservation patterns were found to mark crucial ontogenetic transitions during the plant life cycle which may result in evolutionary constraints limiting diversification. Scope Plant morphology "represents a study of the development, form, and structure of plants, and, by implication, an attempt to interpret these on the basis of similarity of plan and origin". There ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural History Museum At The University Of Oslo
The Natural History Museum at the University of Oslo ( no, Naturhistorisk museum, NHM) is Norway's oldest and largest museum of natural history. It is situated in the neighborhood of Tøyen in Oslo, Norway. It traces its roots to the University Botanical Garden, which was founded near Tøyen Manor in 1814. Museums for zoology, botany and geology were added approximately a hundred years later, when the university campus in central Oslo had become too small for such purposes. Major proponents were Waldemar Christofer Brøgger and Nordal Wille. For most of the twentieth century the museums and botanical garden were organized in five different entities; these were merged on 1 August 1999. The current name dates from 2005. The Zoological Museum displaying wildlife from Norway as well as the rest of the world. The Botanical Garden contains 35,000 plants, 7,500 species and two exhibition greenhouses. The Geological Museum contain research material of more than 2 million fossils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
