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Nordmann Fir
''Abies nordmanniana'', the Nordmann fir or Caucasian fir, is a fir indigenous to the mountains south and east of the Black Sea, in Turkey, Georgia and the Russian Caucasus. It occurs at altitudes of 900–2,200 m on mountains with precipitation of over 1,000 mm. The current distribution of the Nordmann fir is associated with the forest refugia that existed during the Ice Age at the eastern and southern Black Sea coast. In spite of currently suitable climate, the species is not found in areas of the Eastern Greater Caucasus, which are separated from the Black Sea Coast by more than 400–500 km. Description It is a large evergreen coniferous tree growing to 55–61 m tall and with a trunk diameter of up to 2 m. In the Western Caucasus Reserve, some specimens have been reported to be and even tall, the tallest trees in the Caucasus, Anatolia, the Russian Federation and the continent of Europe. The leaves are needle-like, flattened, 1.8–3.5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christian Von Steven
Christian von Steven (; 19 January 1781 – 30 April 1863) was a Finnish-born Russian botanist and entomologist. Life Steven was of Swiss descent. At the age of 57 he married a young widow, Marie Karlovna Gartzewitsch (née Hagendorff), with whom he had five children: *Anton (b. 12 December 1835) - a Lieutenant in the Russian Navy, present at the Siege of Sevastopol (1854–1855) *Julia (24 August 1837 – 1855) *Natalia (27 August 1839 – 1862) - married Lieutenant Colonel Hippenreiter *Alexander (1844–1910) *Katharina (b. 16 August 1841) Career He studied at the Royal Academy of Turku, Sweden and at Jena, Saxe-Weimar, before studying medicine at Saint Petersburg University. The senior Russian sericulture (silk farming) inspector Friedrich August Marschall von Bieberstein employed Steven as his assistant in 1800. He inspected sericulture in the Caucasus, progressing to deputy senior inspector of sericulture in 1806. In 1812, he participated in the creation of the N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest Chord (geometry), chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length d of a diameter is also called the diameter. In this sense one speaks of diameter rather than diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being twice the radius r. :d = 2r \qquad\text\qquad r = \frac. The word "diameter" is derived from (), "diameter of a circle", from (), "across, through" and (), "measure". It is often abbreviated \text, \text, d, or \varnothing. Constructions With straightedge and compass, a diameter of a given circle can be constructed as the perpendicular bisector of an arbitrary chord. Drawing two diameters in this way can be used to locate the center of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uludağ
Uludağ (), the ancient Mysian or Bithynian Olympus ( Greek: Όλυμπος), is a mountain in Bursa Province, Turkey, with an elevation of . In Turkish, ''Uludağ'' means "great mountain". In ancient times the range of which it is a part, extending along the southern edge of Bithynia, was known as Olympos in Greek and Olympus in Latin, the western extremity being known as the Mysian Olympus and the eastern as the Bithynian Olympus, and the city of Bursa was known as Prusa ad Olympum from its position near the mountain. Throughout the Middle Ages, it contained hermitages and monasteries: "The rise of this monastic centre in the 8th c. and its prestige up to the 11th are linked to the resistance of numerous monks to the policy of the iconoclast emperors and then to a latent opposition to the urban, Constantinopolitan monasticism of the Studites."Andre Vauchez et al., ''Encyclopedia of the Middle Ages'', Routledge, 2000, p. 1046 One of the greatest monks of the Christian Eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abies Nordmanniana Subsp
Firs are evergreen coniferous trees belonging to the genus ''Abies'' () in the family Pinaceae. There are approximately 48–65 extant species, found on mountains throughout much of North and Central America, Eurasia, and North Africa. The genus is most closely related to ''Keteleeria'', a small genus confined to eastern Asia. The genus name is derived from the Latin "to rise" in reference to the height of its species. The common English name originates with the Old Norse ''fyri'' or the Old Danish ''fyr''. They are large trees, reaching heights of tall with trunk diameters of when mature. Firs can be distinguished from other members of the pine family by the way in which their needle-like leaves are attached singly to the branches with a base resembling a suction cup, and by their cones, which, like those of cedars, stand upright on the branches like candles and disintegrate at maturity. Identification of the different species is based on the size and arrangement of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontic Mountains
The Pontic Mountains or Pontic Alps (, meaning 'North Anatolian Mountains'), form a mountain range in northern Anatolia, Turkey. They are also known as the "Parhar Mountains" in the local Turkish and Pontic Greek languages. The term ''Parhar'' originates from a Hittite word meaning 'high' or 'summit'. In ancient Greek, the mountains were called the Paryadres or Parihedri Mountains. Etymology The name of the mountains is derived from the Greek word ''Pontus'' ( []), which means 'sea'. The Pontic Mountains, or "Pontus Mountains" ( []) in Greek, stretch along the southern coast of the Black Sea, known in Classical antiquity, antiquity as the "Euxine Sea" or simply ''Pontus Euxinus'' ( []). Geography The range runs roughly east–west, parallel and close to the southern coast of the Black Sea. It extends northeast into Georgia, and west into the Sea of Marmara, with the northwestern spur of the Küre Mountains (and their western extension the Akçakoca Mountains) and the Bolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caucasus (mountains)
The Caucasus Mountains * * Azerbaijani: , * * * * * * * * * * * is a mountain range at the intersection of Asia and Europe. Stretching between the Black Sea and the Caspian Sea, they are surrounded by the Caucasus region and are home to Mount Elbrus, the highest peak in Europe at above sea level. The Caucasus Mountains include the Greater Caucasus in the north and the Lesser Caucasus in the south. The Greater Caucasus runs west-northwest to east-southeast, from the Western Caucasus on the northeastern shore of the Black Sea to close to Baku on the Caspian Sea, in Azerbaijan. The Lesser Caucasus runs parallel to the Greater about south. The Greater and Lesser Caucasus ranges are connected by the Likhi Range, and to the west and east of the Likhi Range lie the Colchis Plain and the Kur-Araz Lowland respectively. The Meskheti Range is a part of the Lesser Caucasus system. In the southeast, the Aras River separates the Lesser Caucasus from the Talysh Mount ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odessa Botanical Garden
Odesa Botanical Garden is a botanical garden in Odesa, Ukraine. It is subordinated to Odesa University and consists of two territories: old territory and new territory. History The Botanical Garden in Odesa was established in 1820, on the initiative of Governor-General Alexander Fedorovich Langeron, an expert in culture of the Sharlem Dessementom rose. In 1834–1848 it was further developed under the lead of Alexander von Nordmann, and a Central School of Gardening with a Department of Sericulture Sericulture, or silk farming, is the cultivation of silkworms to produce silk. Although there are several commercial species of silkworms, the caterpillar of the Bombyx mori, domestic silkmoth is the most widely used and intensively studied silkwo ... were also established.ALEXANDER DAVIDOVICH VON NORDMANN cybertruffle.or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Von Nordmann
Alexander von Nordmann (24 May 1803 in Ruotsinsalmi, Vyborg Governorate – 25 June 1866 in Helsinki, Grand Duchy of Finland) was a Finnish biologist, who contributed to zoology, parasitology, botany and paleontology.Leikola A (2001Nordmann, Alexander von (1803 - 1866) - eläintieteen professori, todellinen valtioneuvosKansallisbiografia. SKS Biografiakeskus Biography Nordmann was a son of an officer of the Russian army at the Ruotsinsalmi fortress, Old Finland. He started academic studies at the Imperial Academy of Turku, and at that time also acted as a curator of the entomological collections. In 1827 he continued studies in Berlin with the famous parasitologist and anatomist Karl Rudolphi. His first major work was a microscopical description of tens of parasitic worms and crustaceans from the eyes and other organs of fishes and other animals, including man. These included the enigmatic monogenean '' Diplozoon paradoxum''. In 1832 he was appointed a professor (teacher) a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seed
In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a ''testa''. More generally, the term "seed" means anything that can be Sowing, sown, which may include seed and husk or tuber. Seeds are the product of the ripened ovule, after the embryo sac is fertilization, fertilized by Pollen, sperm from pollen, forming a zygote. The embryo within a seed develops from the zygote and grows within the mother plant to a certain size before growth is halted. The formation of the seed is the defining part of the process of reproduction in seed plants (spermatophytes). Other plants such as ferns, mosses and marchantiophyta, liverworts, do not have seeds and use water-dependent means to propagate themselves. Seed plants now dominate biological Ecological niche, niches on land, from forests to grasslands both in hot and cold climates. In the flowering plants, the ovary ripens into a fruit which contains the seed and serves to disseminate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conifer Cone
A conifer cone, or in formal botanical usage a strobilus, : strobili, is a seed-bearing organ on gymnosperm plants, especially in conifers and cycads. They are usually woody and variously conic, cylindrical, ovoid, to globular, and have scales and bracts arranged around a central axis, but can be fleshy and berry-like. The cone of Pinophyta (conifer clade) contains the reproductive structures. The woody cone is the female cone, which produces seeds. The male cone, which produces pollen, is usually ephemeral and much less conspicuous even at full maturity. The name "cone" derives from Greek ''konos'' (pine cone), which also gave name to the geometric cone. The individual plates of a cone are known as ''scales''. In conifers where the cone develops over more than one year (such as pines), the first year's growth of a seed scale on the cone, showing up as a protuberance at the end of the two-year-old scale, is called an ''umbo'', while the second year's growth is called th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stomata
In botany, a stoma (: stomata, from Greek ''στόμα'', "mouth"), also called a stomate (: stomates), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange between the internal air spaces of the leaf and the atmosphere. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that regulate the size of the stomatal opening. The term is usually used collectively to refer to the entire stomatal complex, consisting of the paired guard cells and the pore itself, which is referred to as the stomatal aperture. Air, containing oxygen, which is used in respiration, and carbon dioxide, which is used in photosynthesis, passes through stomata by gaseous diffusion. Water vapour diffuses through the stomata into the atmosphere as part of a process called transpiration. Stomata are present in the sporophyte generation of the vast majority of land plants, with the exception of liverworts, as well as so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaf
A leaf (: leaves) is a principal appendage of the plant stem, stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, flower, and fruit collectively form the Shoot (botany), shoot system. In most leaves, the primary Photosynthesis, photosynthetic Tissue (biology), tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf, but in some species, including the mature foliage of ''Eucalyptus'', palisade mesophyll is present on both sides and the leaves are said to be isobilateral. The leaf is an integral part of the stem system, and most leaves are flattened and have distinct upper (Glossary of botanical terms#adaxial, adaxial) and lower (Glossary of botanical terms#abaxial, abaxial) surfaces that differ in color, Trichome, hairiness, the number of stomata (pores that intake and output gases), the amount and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
