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Oldest Viable Seed
There have been several seeds known at different times as the oldest viable seed. Dormancy allows seeds to survive for extended periods, which can aid in seed dispersal and spread out the growth and establishment of seedlings, increasing the likelihood that some of the next generations survive if conditions are not suitable for seedling establishment. Over time, seeds lose viability which is the ability to initiate metabolic activity, cellular growth, and germination. Seeds have many cells and tissues that die over time, and these deaths can be delayed or increased by environmental conditions the seed experiences. Very generally, small seeds, especially from weedy species and annuals are more likely to remain viable in the soil longer than larger perennial seeds. The seeds of some aquatic plants also may remain viable longer in mud because their viability is aided by the aquatic environment which remains cool and moist. Carbon-dated *The oldest seed that has grown into a via ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silene Stenophylla 115390032
''Silene'' is a genus of flowering plants in the family Caryophyllaceae. Containing nearly 900 species, it is the largest genus in the family. Common names include campion and catchfly. Many ''Silene'' species are widely distributed, particularly in the northern hemisphere. Scientific history Members of this genus have been the subject of research by preeminent plant ecologists, evolutionary biologists, and geneticists, including Charles Darwin, Gregor Mendel, Carl Correns, Herbert G. Baker, and Janis Antonovics. Many ''Silene'' species continue to be widely used to study systems, particularly in the fields of ecology and evolutionary biology.Bernasconi et al. 2009. Silene as a model system in ecology and evolution. Heredity. 103:5-14. PMI19367316/ref> The genus has been used as a model for understanding the genetics of sex determination for over a century. ''Silene'' species commonly contain a mixture of hermaphroditic and female (or male-sterile) individuals (gynodioecy), and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lentil
The lentil (''Lens culinaris'' or ''Lens esculenta'') is an edible legume. It is an annual plant known for its lens-shaped seeds. It is about tall, and the seeds grow in pods, usually with two seeds in each. As a food crop, the largest producer is Canada, producing 45% of the world’s total lentils. In cuisines of the Indian subcontinent, where lentils are a staple, split lentils (often with their hulls removed) known as dal are often cooked into a thick curry/gravy that is usually eaten with rice or '' rotis''. Botanical description Name Many different names in different parts of the world are used for the crop lentil. The first use of the word ''lens'' to designate a specific genus was in the 16th century by the botanist Tournefort. The word "lens" for the lentil is of classical Roman/Latin origin: McGee points out that a prominent Roman family took the name " Lentulus", just as the family name "Cicero" was derived from the chickpea, '' Cicer arietinum'', or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ABC News And Current Affairs
ABC News, or ABC News and Current Affairs, is a public news service produced by the Australian Broadcasting Corporation. Broadcasting within Australia and the rest of the world, the service covers both local and world affairs. The division of the organisation, which is called ABC News, Analysis and Investigations. is responsible for all news-gathering and coverage across the Australian Broadcasting Corporation's various television, radio, and online platforms. Some of the services included under the auspices of the division are the ABC News TV channel (formerly ABC News 24); the long-running radio news programs, '' AM'', '' The World Today'', and '' PM''; ABC NewsRadio, a 24-hour continuous news radio channel; and radio news bulletins and programs on ABC Local Radio, ABC Radio National, ABC Classic FM, and Triple J. ABC News Online has an extensive online presence which includes many written news reports and videos available via ABC Online, an ABC News mobile app (ABC Listen) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placentation
Placentation refers to the formation, type and structure, or arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory gases, and water from maternal tissue to a growing embryo, and in some instances to remove waste from the embryo. Placentation is best known in live-bearing mammals (theria), but also occurs in some fish, reptiles, amphibians, a diversity of invertebrates, and flowering plants. In vertebrates, placentas have evolved more than 100 times independently, with the majority of these instances occurring in squamate reptiles. The placenta can be defined as an organ formed by the sustained apposition or fusion of fetal membranes and parental tissue for physiological exchange. This definition is modified from the original Mossman (1937) definition, which constrained placentation in animals to only those instances where it occurred in the uterus. In mammals In live bearing mammals, the placenta forms after the embryo implants into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siberia
Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part of Russia since the latter half of the 16th century, after the Russians conquered lands east of the Ural Mountains. Siberia is vast and sparsely populated, covering an area of over , but home to merely one-fifth of Russia's population. Novosibirsk, Krasnoyarsk and Omsk are the largest cities in the region. Because Siberia is a geographic and historic region and not a political entity, there is no single precise definition of its territorial borders. Traditionally, Siberia extends eastwards from the Ural Mountains to the Pacific Ocean, and includes most of the drainage basin of the Arctic Ocean. The river Yenisey divides Siberia into two parts, Western and Eastern. Siberia stretches southwards from the Arctic Ocean to the hills of north-ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silene Stenophylla
''Silene stenophylla'' is a species of flowering plant in the family (biology), family Caryophyllaceae. Commonly called narrow-leafed campion, it is a species in the genus ''Silene''. It grows in the Arctic tundra of far eastern Siberia and the mountains of northern Japan. Frozen samples, estimated via radiocarbon dating to be around 32,000 years old, were discovered in the same area as current living specimens, and in 2012, a team of scientists successfully regenerated a plant from the samples. Habitat and description ''S. stenophylla'' grows in the Arctic tundra of far eastern Siberia and the mountains of northern Japan. It is typically tall, has narrow leaves, and a large calyx (flower), calyx. It blooms during the summer and has incised petals that are lilac, light pink, or white in color. It is a perennial that grows on stony cliffs and sandy shores. ''S. stenophylla'' is one of a few Beringian plant species that did not establish itself in North America. Etymology The bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Today
''History Today'' is an illustrated history magazine. Published monthly in London since January 1951, it presents serious and authoritative history to as wide a public as possible. The magazine covers all periods and geographical regions and publishes articles of traditional narrative history alongside new research and historiography. A sister publication ''History Review'', produced tri-annually until April 2012, provided information for sixth-form history students. History The magazine was founded after the Second World War, by Brendan Bracken, former Minister of Information, chairman of the ''Financial Times'' and close associate of Sir Winston Churchill. The magazine has been independently owned since 1981. The founding co-editors were Peter Quennell, a "dashing English man of letters", and Alan Hodge, former journalist at the ''Financial Times''. The website contains all the magazine's published content since 1951. A digital edition, available on a dedicated app, was launch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Thiselton-Dyer
Sir William Turner Thiselton-Dyer (28 July 1843 – 23 December 1928) was a leading British botanist, and the third director of the Royal Botanic Gardens, Kew. Life and career Thiselton-Dyer was born in Westminster, London. He was a son of William George Thiselton-Dyer (1812-1868), physician and Catherine Jane, née Firminger (1815-1897), botanist. He was educated at King's College School where he was first mathematical scholar, and later proceeded to the medical department of King's College London, where he remained until 1863 when he proceeded to Christ Church, Oxford. Initially studying mathematics at Christ Church, Oxford, he graduated in natural science in 1867. He became Professor of Natural History at the Royal Agricultural College in Cirencester and then Professor of Botany at the Royal College of Science for Ireland in Dublin. In 1872, he became professor at the Royal Horticultural Society in London, being recommended by Joseph Dalton Hooker. Then in 1875, Thiselton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Botanic Gardens, Kew
Royal Botanic Gardens, Kew is a non-departmental public body in the United Kingdom sponsored by the Department for Environment, Food and Rural Affairs. An internationally important botanical research and education institution, it employs 1,100 staff. Its board of trustees is chaired by Dame Amelia Fawcett. The organisation manages botanic gardens at Kew in Richmond upon Thames in south-west London, and at Wakehurst, a National Trust property in Sussex which is home to the internationally important Millennium Seed Bank, whose scientists work with partner organisations in more than 95 countries. Kew, jointly with the Forestry Commission, founded Bedgebury National Pinetum in Kent in 1923, specialising in growing conifers. In 1994, the Castle Howard Arboretum Trust, which runs the Yorkshire Arboretum, was formed as a partnership between Kew and the Castle Howard Estate. In 2019, the organisation had 2,316,699 public visitors at Kew, and 312,813 at Wakehurst. Its site at Kew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Museum
The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It documents the story of human culture from its beginnings to the present.Among the national museums in London, sculpture and decorative and applied art are in the Victoria and Albert Museum; the British Museum houses earlier art, non-Western art, prints and drawings. The National Gallery holds the national collection of Western European art to about 1900, while art of the 20th century on is at Tate Modern. Tate Britain holds British Art from 1500 onwards. Books, manuscripts and many works on paper are in the British Library. There are significant overlaps between the coverage of the various collections. The British Museum was the first public national museum to cover all fields of knowledge. The museum was established in 1753, largely b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Egyptomania
Egyptomania refers to a period of renewed interest in the culture of ancient Egypt sparked by Napoleon's Egyptian Campaign in the 19th century. Napoleon was accompanied by many scientists and scholars during this Campaign, which led to a large interest after the documentation of ancient monuments in Egypt. The ancient remains had never been so thoroughly documented before and so the interest in ancient Egypt increased significantly. Jean-François Champollion deciphered the ancient hieroglyphs in 1822 by using the Rosetta Stone that was recovered by French troops in 1799 which began the study of scientific Egyptology. Culture The fascination with ancient Egypt manifested through literature, architecture, art, film, politics and religion. Very few people could afford a trip to Egypt during the peak of Egyptomania and only made contact with Egyptian culture through literature, art, and architecture. Particularly influential were Vivant Denon's ''Voyage dans la Basse et la H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
