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Hermann Fol
Hermann Fol (23 July 1845, Saint-Mandé – March 1892) was a Swiss zoologist and has been considered a pioneer of embryology. He studied under Édouard Claparède and Ernst Haeckel and took a special interest in the fertilization and embryology of echinoderms. He also innovated scientific devices, examined the safety of drinking water and was interested in rabies vaccinations. He was involved in establishing a marine biology laboratory at Villefranche-sur-Me and vanished at sea aboard a small yacht, the ''Aster,'' which left on 13 March from Le Havre and he was last known living on 17th March. The boat was later discovered off the coast of west Africa with nobody aboard. Life and work Fol was born in a wealthy banking family in Geneva then living at St. Mandé, near Paris where his father Etienne-Joseph worked. His mother died when he was six years old and he went to secondary school in Geneva where he was influenced by Edouard Claparède and François Jules Pictet de la R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint-Mandé
Saint-Mandé (; named for Saint Maudez) is a Communes of France, commune in the Val-de-Marne Departments of France, department in Île-de-France, in the high-end eastern inner suburbs of Paris, France. It is located from the Kilometre zero, centre of Paris. Saint-Mandé is one of the smallest communes in Île-de-France by land area, but also one of the most densely populated municipalities in Europe. It is located on the edge of the 12th arrondissement of Paris, adjacent to the Bois de Vincennes, near the Porte de Vincennes and the Porte de Saint-Mandé. The town motto is ''Cresco et Floresco'', which means "I grow and I flourish" in Latin. History On 1 January 1860, the city of Paris was enlarged by annexing neighbouring communes. On that occasion, about two-thirds of the commune of Saint-Mandé was annexed to the city and now forms the neighbourhoods of Bel-Air (Paris), Bel-Air and Picpus, Paris, Picpus in the 12th arrondissement of Paris. In 1929, Saint-Mandé lost an addit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms that drift in Hydrosphere, water (or atmosphere, air) but are unable to actively propel themselves against ocean current, currents (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish, and baleen whales. Marine plankton include bacteria, archaea, algae, protozoa, microscopic fungi, and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. fresh water, Freshwater plankton are similar to marine plankton, but are found in lakes and rivers. Mostly, plankton just drift where currents take them, though some, like jellyfish, swim slowly but not fast enough to generally overcome the influence of currents. Although plankton are usually thought of as inhabiting water, there are also airborne versions that live part of their lives drifting in the at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A New Barthometer By Hermann Fol
A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is '' a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version is often written in one of two forms: the double-storey and single-storey . The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, '' a'' is the indefinite article, with the alternative form ''an''. Name In English, the name of the letter is the ''long A'' sound, pronounced . Its name in most other languages matches the letter's pronunciation in open syllables. History The earliest known ancestor of A is ''aleph''—the first letter of the Phoenician ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bénodet
Bénodet (; Breton: ''Benoded'') is a commune in the Finistère department and administrative region of Brittany in north-western France. INSEE It lies about 16 kilometres south of . The Breton name Benoded means " of the Odet". Bénodet has a , a [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunisia
Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares maritime borders with Italy through the islands of Sicily and Sardinia to the north and Malta to the east. It features the archaeological sites of Carthage dating back to the 9th century BC, as well as the Great Mosque of Kairouan. Known for its ancient architecture, Souks of Tunis, souks, and blue coasts, it covers , and has a population of 12.1 million. It contains the eastern end of the Atlas Mountains and the northern reaches of the Sahara desert; much of its remaining territory is arable land. Its of coastline includes the African conjunction of the western and eastern parts of the Mediterranean Basin. Tunisia is home to Africa's northernmost point, Cape Angela. Located on the northeastern coast, Tunis is the capital and List of cities ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porifera
Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a Basal (phylogenetics) , basal clade and a sister taxon of the Eumetazoa , diploblasts. They are sessility (motility) , sessile filter feeders that are bound to the seabed, and are one of the most ancient members of macrobenthos, with many historical species being important sponge reef , reef-building organisms. Sponges are multicellular organisms consisting of jelly-like mesohyl sandwiched between two thin layers of cell (biology) , cells, and usually have tube-like bodies full of pores and channels that allow water to circulate through them. They have unspecialized cells that can cellular differentiation , transform into other types and that often migrate between the main cell layers and the mesohyl in the process. They do not have complex nervous system , nervous, digestive system , digestive or circulatory systems. Instead, most rely on maintaining a constant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleksei Korotnev
Aleksei Alekseevich Korotnev (February 15, 1854, Moscow – June 14, 1915, Odessa) was a Russian zoologist. Korotnev graduated from Moscow University in 1876 and gained his doctorate there in 1881. In 1887, he became a professor at the St. Vladimir Imperial University of Kiev. In 1885 and in 1890-91, he made extensive zoological collections in the Indian Ocean and Pacific Ocean regions. In 1886, he began studies at Observatoire Oceanologique de Villefranche (Villafranca, France). Korotnev also studied the fauna of Lake Baikal between 1900 and 1902. His principal work was on the embryonic development of cnidarians, bryozoans, tunicates and insects. He was a corresponding member of the St. Petersburg Academy of Sciences (1903). Taxa named in honour The following taxa have been named in honour (eponyms) of Aleksei Alekseevich Korotnev: Gastropoda: *'' Korotnewia'' Kozhov, 1936 *'' Korotnewia korotnevi'' (Lindholm, 1909) *'' Cincinna korotnevi'' (Lindholm, 1909) *'' Pseudancylastru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jules Henri Barrois
Jules Henri Barrois (3 September 1852 – 1943) was a French zoologist and head of the marine zoological laboratory ( l'Observatoire Oceanologique de Villefranche) at Villefranche-sur-Mer from the early 1880s. He was the brother of Charles Barrois (1851–1939), geologist and palaeontologist, and student of Alfred Mathieu Giard (1846–1908) at Université de Lille. Publications * ''Mémoire sur l'embryologie des Bryozaires Mémoire sur l'embryologie des Némertes'', dissertation presented to the "Faculté des sciences" in Paris, 1877 - Memoir on the embryology of bryozoans; Memoire on the embryology of nemerteans. * ''Mémoire sur les membranes embryonnaires des Salpes'', 1881 - Memoire on the embryonic membranes of Salpidae. * ''Études complémentaires sur la métamorphose des bryozoaires'', 1925 - Complementary studies on the metamorphosis of bryozoans. * ''Étude sur la formation du polypide des bryozoaires'', 1927 - Study on the formation of polypide The p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Geneva
The University of Geneva (French: ''Université de Genève'') is a public university, public research university located in Geneva, Switzerland. It was founded in 1559 by French theologian John Calvin as a Theology, theological seminary. It remained focused on theology until the 17th century, when it became a center for the Enlightenment, enlightenment scholarship. Today, it is the third largest university in Switzerland by number of students. In 1873, it dropped its religious affiliations and became officially secular. In 2009, the University of Geneva celebrated the 450th anniversary of its founding. Almost 40% of the students come from over 150 foreign countries. The university holds and actively pursues teaching, Research university, research, and community service as its primary objectives. The University of Geneva is a member of the League of European Research Universities, 4EU+ Alliance, Coimbra Group, International Forum of Public Universities, and European University A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oscar Hertwig
Oscar Hertwig (21 April 1849 in Friedberg – 25 October 1922 in Berlin) was a German embryologist and zoologist known for his research in developmental biology and evolution. Hertwig is credited as the first person to observe sexual reproduction at the cellular level, by looking at the cells of sea urchins under the microscope. Biography Hertwig was the elder brother of zoologist-professor Richard Hertwig (1850–1937). The Hertwig brothers were the most eminent scholars of Ernst Haeckel (and Carl Gegenbaur) from the University of Jena. They were independent of Haeckel's philosophical speculations but took his ideas in a positive way to widen their concepts in zoology. Initially, between 1879 and 1883, they performed embryological studies, especially on the theory of the coelom (1881), the fluid-filled body cavity. These problems were based on the phylogenetic theorems of Haeckel, i.e. the biogenic theory (German = biogenetisches Grundgesetz), and the " gastraea theory" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cellular Division
Cell division is the process by which a parent cell divides into two daughter cells. Cell division usually occurs as part of a larger cell cycle in which the cell grows and replicates its chromosome(s) before dividing. In eukaryotes, there are two distinct types of cell division: a vegetative division (mitosis), producing daughter cells genetically identical to the parent cell, and a cell division that produces haploid gametes for sexual reproduction (meiosis), reducing the number of chromosomes from two of each type in the diploid parent cell to one of each type in the daughter cells. Mitosis is a part of the cell cycle, in which, replicated chromosomes are separated into two new nuclei. Cell division gives rise to genetically identical cells in which the total number of chromosomes is maintained. In general, mitosis (division of the nucleus) is preceded by the S stage of interphase (during which the DNA replication occurs) and is followed by telophase and cytokinesis; which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fertilisation
Fertilisation or fertilization (see spelling differences), also known as generative fertilisation, syngamy and impregnation, is the fusion of gametes to give rise to a zygote and initiate its development into a new individual organism or offspring. While processes such as insemination or pollination, which happen before the fusion of gametes, are also sometimes informally referred to as fertilisation, these are technically separate processes. The cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms, the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation. History In antiquity, Aristotle conceived the formation of new individuals through fusion of male and female fluids, with form and function emerging gradually, in a mode called by him as epigenetic. In 1784, Spallanzani established the need of in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
