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Schewiakoff
Vladimir Timofeyevich Shevyakov, in Russian Владимир Тимофеевич Шевяков (29 October 1859, St. Petersburg – 18 October 1930, Irkutsk) was a Russian biologist who worked on Protozoa. Shevyakov studied under Konstantin Mereschkowski in St. Petersburg and Otto Bütschli at the University of Heidelberg. He was married to Lydia Kowalevsky, the youngest daughter of Alexander Kovalevsky. He was a professor at St. Petersburg University until 1911 when he left science and became a vice-minister in the government of Tzar Nicholas. During the revolution he and his family moved first to Perm in Ural and in 1920 he became professor in Irkutsk. He is mainly known for his work on Radiolaria, Ciliata and Acantharea. He described many taxa. Most of his publications are under the German spelling of his name which is Schewiakoff. Works Über die karyokinetische Kerntheilung der ''Euglypha alveolata'' "Morphologische Jahrbuch" 13, ss. 193–258 (1888) * Man wüns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protistology
Protistology is a scientific discipline devoted to the study of protists, a highly diverse group of eukaryotic organisms. All eukaryotes apart from animals, plants and fungi are considered protists. Its field of study therefore overlaps with the more traditional disciplines of phycology, mycology, and protozoology, just as protists embrace mostly unicellular organisms described as algae, some organisms regarded previously as primitive fungi, and protozoa ("animal" motile protists lacking chloroplasts). They are a paraphyletic group with very diverse morphologies and lifestyles. Their sizes range from unicellular picoeukaryotes only a few micrometres in diameter to multicellular marine algae several metres long. History The term "protozoology" has become dated as understanding of the evolutionary relationships of the eukaryotes has improved, and is frequently replaced by the term "protistology". For example, the Society of Protozoologists, founded in 1947, was renamed Internatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otto Bütschli
Johann Adam Otto Bütschli (3 May 1848 – 2 February 1920) was a German zoologist and professor at the University of Heidelberg. He specialized in invertebrates and insect development. Many of the groups of protists were first recognized by him. Life Bütschli was born Frankfurt am Main. He studied mineralogy, chemistry, and paleontology in Karlsruhe and became assistant of Karl Alfred von Zittel (geology and paleontology). He moved to Heidelberg in 1866 and worked with Robert Bunsen (chemistry). He received his PhD from the University of Heidelberg in 1868, after passing examinations in geology, paleontology, and zoology. He joined Rudolf Leuckart at the University of Leipzig in 1869. After leaving his studies to serve as an officer in the Franco-Prussian War (1870–1871), Bütschli worked in his private laboratory and then for two years (1873–1874) with Karl Möbius at the University of Kiel. After that, he worked privately. In 1876, he made Habilitation. He became prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protozoa
Protozoa (singular: protozoan or protozoon; alternative plural: protozoans) are a group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic tissues and debris. Historically, protozoans were regarded as "one-celled animals", because they often possess animal-like behaviours, such as motility and predation, and lack a cell wall, as found in plants and many algae. When first introduced by Georg Goldfuss (originally spelled Goldfuß) in 1818, the taxon Protozoa was erected as a class within the Animalia, with the word 'protozoa' meaning "first animals". In later classification schemes it was elevated to a variety of higher ranks, including phylum, subkingdom and kingdom, and sometimes included within Protoctista or Protista. The approach of classifying Protozoa within the context of Animalia was widespread in the 19th and early 20th century, but not universal. By the 1970s, it became usual to require th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Petersburg
Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), is the second-largest city in Russia. It is situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, with a population of roughly 5.4 million residents. Saint Petersburg is the fourth-most populous city in Europe after Istanbul, Moscow and London, the most populous city on the Baltic Sea, and the world's northernmost city of more than 1 million residents. As Russia's Imperial capital, and a historically strategic port, it is governed as a federal city. The city was founded by Tsar Peter the Great on 27 May 1703 on the site of a captured Swedish fortress, and was named after apostle Saint Peter. In Russia, Saint Petersburg is historically and culturally associated with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perm, Russia
Perm (russian: Пермь, p=pʲermʲ), previously known as Yagoshikha (Ягошиха) (1723–1781), and Molotov (Молотов) (1940–1957), is the largest city and the administrative centre of Perm Krai, Russia. The city is located on the banks of the Kama River, near the Ural Mountains, covering an area of , with a population of over one million residents. Perm is the List of cities and towns in Russia by population, fifteenth-largest city in Russia, and the fifth-largest city in the Volga Federal District. In 1723, a copper-smelting works was founded at the village of ''Yagoshikha''. In 1781 the settlement of Yagoshikha became the town of ''Perm''. Perm's position on the navigable Kama River, leading to the Volga, and on the Siberian Route across the Ural Mountains, helped it become an important trade and manufacturing centre. It also lay along the Trans-Siberian Railway. Perm grew considerably as industrialization proceeded in the Urals during the Soviet period, and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russian Zoologists
This list of Russian biologists includes the famous biologists from the Russian Federation, the Soviet Union, the Russian Empire and other predecessor states of Russia. Biologists of all specialities may be listed here, including ecologists, botanists, zoologists, paleontologists, biochemists, physiologists and others. Alphabetical list A *Johann Friedrich Adam, discoverer of the Adams mammoth, the first complete woolly mammoth skeleton *Igor Akimushkin, biologist *Vladimir Prokhorovich Amalitskii, paleontologist *Nicolai Ivanovich Andrusov, Nicolai Andrusov, paleontologist *Andrey Avinoff, entomologist *Anatoly Andriyashev, Ichthyology, ichthyologist, zoogeography, zoogeographist B *Karl Ernst von Baer, naturalist, founder of the Russian Entomological Society, formulated embryological Baer's laws *Alexander Barchenko, notable for his research of Hyperborea *Jacques von Bedriaga, prominent herpetologist, described Bedriaga's rock lizard and Bedriaga's skink *Andrey Belozersky, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Encyclopedia Of Life
The ''Encyclopedia of Life'' (''EOL'') is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It is compiled from existing trusted databases curated by experts and with the assistance of non-experts throughout the world. It aims to build one "infinitely expandable" page for each species, including video, sound, images, graphics, as well as text. In addition, the Encyclopedia incorporates content from the Biodiversity Heritage Library, which digitizes millions of pages of printed literature from the world's major natural history libraries. The project was initially backed by a US$50 million funding commitment, led by the MacArthur Foundation and the Sloan Foundation, who provided US$20 million and US$5 million, respectively. The additional US$25 million came from five cornerstone institutions—the Field Museum, Harvard University, the Marine Biological Laboratory, the Missouri Botanical Garden, and the Smithsonian Institutio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stazione Zoologica
The Stazione Zoologica Anton Dohrn is a research institute in Naples, Italy, devoted to basic research in biology. Research is largely interdisciplinary involving the fields of evolution, biochemistry, molecular biology, neurobiology, cell biology, biological oceanography, marine botany, molecular plant biology, benthic ecology, and ecophysiology. Founded in 1872 as a private concern by Anton Dohrn, in 1982 the Stazione Zoologica came under the supervision and control of the Ministero dell'Università e della Ricerca Scientifica e Tecnologica (Ministry of Universities and Scientific and Technological Research) as a National Institute. History The idea Dohrn's idea was to establish an international scientific community provided with laboratory space, equipment, research material and a library. This was supported and funded by the German Empire, German Government, Thomas Henry Huxley, Charles Darwin, Francis Maitland Balfour, Francis Balfour and Charles Lyell among others. Dohrn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prudence Winter Kofoid
Prudence ( la, prudentia, contracted from meaning "seeing ahead, sagacity") is the ability to govern and discipline oneself by the use of reason. It is classically considered to be a virtue, and in particular one of the four Cardinal virtues (which are, with the three theological virtues, part of the seven virtues). Prudentia is an allegorical female personification of the virtue, whose attributes are a mirror and snake, who is frequently depicted as a pair with Justitia, the Roman goddess of Justice. The word derives from the 14th-century Old French word ''prudence'', which, in turn, derives from the Latin ''prudentia'' meaning "foresight, sagacity". It is often associated with wisdom, insight, and knowledge. In this case, the virtue is the ability to judge between virtuous and vicious actions, not only in a general sense, but with regard to appropriate actions at a given time and place. Although prudence itself does not perform any actions, and is concerned solely with k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giovanni Battista Grassi
Giovanni Battista Grassi (27 March 1854 – 4 May 1925) was an Italian physician and zoologist, best known for his pioneering works on parasitology, especially on malariology. He was Professor of Comparative Zoology at the University of Catania from 1883, and Professor of Comparative Anatomy at Sapienza University of Rome from 1895 until his death. His scientific contributions covered embryological development of honey bees, on helminth parasites, the vine parasite phylloxera, on migrations and metamorphosis in eels, and on termites. He was the first to describe and establish the life cycle of the human malarial parasite, ''Plasmodium falciparum'', and discovered that only female anopheline mosquitoes are capable of transmitting the disease. His works in malaria remain a lasting controversy in the history of Nobel Prizes, because a British army surgeon Ronald Ross, who discovered the transmission of malarial parasite in birds was given the 1902 Nobel Prize in Physiology or M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acantharea
The Acantharea (Acantharia) are a group of radiolarian protozoa, distinguished mainly by their strontium sulfate skeletons. Acantharians are heterotrophic marine microplankton that range in size from about 200 microns in diameter up to several millimeters. Some acantharians have photosynthetic endosymbionts and hence are considered mixotrophs. Morphology Acantharian skeletons are composed of strontium sulfate, SrSO4, in the form of mineral celestine crystal. Celestine is named for the delicate blue colour of its crystals, and is the heaviest mineral in the ocean. The denseness of their celestite ensures acantharian shells function as mineral ballast, resulting in fast sedimentation to bathypelagic depths. High settling fluxes of acantharian cysts have been observed at times in the Iceland Basin and the Southern Ocean, as much as half of the total gravitational organic carbon flux. Material was copied from this source, which is available under Creative Commons Attribution 4 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
