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Winogradsky Column
{{Short description, Device for culturing microorganisms The Winogradsky column is a simple device for culturing a large diversity of microorganisms. Invented in the 1880s by Sergei Winogradsky, the device is a column of pond mud and water mixed with a carbon source such as newspaper (containing cellulose), blackened marshmallows or egg-shells (containing calcium carbonate), and a sulfur source such as gypsum ( calcium sulfate) or egg yolk. Incubating the column in sunlight for months results in an aerobic/ anaerobic gradient as well as a sulfide gradient. These two gradients promote the growth of different microorganisms such as '' Clostridium'', '' Desulfovibrio'', '' Chlorobium'', ''Chromatium'', '' Rhodomicrobium'', and '' Beggiatoa'', as well as many other species of bacteria, cyanobacteria, and algae. The column provides numerous gradients, depending on additive nutrients, from which the variety of aforementioned organisms can grow. The aerobic water phase and anaerobic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winogradsky Week1
Winogradsky is a surname. Notable people with the surname include: * Winogradsky family from Tokmak, Ukraine, sons of ''Olga'' and ''Isaac Winogradsky'': ** Lew Grade (born Louis Winogradsky) ** Bernard Delfont (born Boris Winogradsky) ** Leslie Grade (born László Winogradsky) *** Michael Grade, son of Leslie * Éric Winogradsky, French tennis player * Sergei Winogradsky, Ukrainian scientist **Winogradsky column {{Short description, Device for culturing microorganisms The Winogradsky column is a simple device for culturing a large diversity of microorganisms. Invented in the 1880s by Sergei Winogradsky, the device is a column of pond mud and water mixed ..., a device designed to analyze several types of microorganisms and their energy sources ** Vinogradsky (crater), a Martian impact crater * Alexander Avraham Winogradsky,(usual name: Alexander A. Winogradsky Frenkel) a Russian born Soviet citizen, now a psycho-linguist and Eastern Orthodox archpriest of the patriarchate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desulfovibrio
''Desulfovibrio'' is a genus of Gram-negative sulfate-reducing bacteria. ''Desulfovibrio'' species are commonly found in aquatic environments with high levels of organic material, as well as in water-logged soils, and form major community members of extreme oligotrophic habitats such as deep granitic fractured rock aquifers. They're also found in the guts of beetles, such as '' Melolontha melolontha'', where they perform sulfate reduction. High amounts of ''Desulfovibrio'' bacteria have been associated with inflammatory bowel disease, bacteremia infections, and Parkinson's disease. Some'' Desulfovibrio'' species have in recent years been shown to have bioremediation potential for toxic radionuclides such as uranium by a reductive bioaccumulation process, such as converting highly water-soluble U(VI) to relatively insoluble U(IV) precipitate, thus removing the toxic uranium from contaminated water. Phylogeny The currently accepted taxonomy is based on the List of Prokaryoti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russian Inventions
This timeline of Russian innovation encompasses key events in the history of technology in Russia. The entries in this timeline fall into the following categories: * indigenous invention, like airliners, AC transformers, radio receivers, television, artificial satellites, ICBMs * uniquely Russian products, objects and events, like Saint Basil's Cathedral, Matryoshka dolls, Russian vodka * products and objects with superlative characteristics, like the Tsar Bomba, the AK-47, and the Typhoon-class submarine * scientific and medical discoveries, like the periodic law, vitamins and stem cells This timeline includes scientific and medical discoveries, products and technologies introduced by various peoples of Russia and its predecessor states, regardless of ethnicity, and also lists inventions by naturalized immigrant citizens. Certain innovations achieved internationally may also appear in this timeline in cases where the Russian side played a major role in such projects. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Edinburgh
The University of Edinburgh (, ; abbreviated as ''Edin.'' in Post-nominal letters, post-nominals) is a Public university, public research university based in Edinburgh, Scotland. Founded by the City of Edinburgh Council, town council under the authority of a royal charter from King James VI and I, James VI in 1582 and officially opened in 1583, it is one of Scotland's Ancient universities of Scotland, four ancient universities and the List of oldest universities in continuous operation, sixth-oldest university in continuous operation in the English-speaking world. The university played a crucial role in Edinburgh becoming a leading intellectual centre during the Scottish Enlightenment and contributed to the city being nicknamed the "Etymology of Edinburgh#Athens of the North, Athens of the North". The three main global university rankings (Academic Ranking of World Universities, ARWU, Times Higher Education World University Rankings, THE, and QS World University Rankings, QS) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carleton College
Carleton College ( ) is a Private college, private Liberal arts colleges in the United States, liberal arts college in Northfield, Minnesota, United States. Founded in 1866, the main campus is between Northfield and the approximately Carleton College Cowling Arboretum, Cowling Arboretum, which became part of the campus in the 1920s. The college offers courses from 33 major programs and 38 minor programs, and has the option for students to design their own majors. Carleton's varsity sports compete at the NCAA Division III level in the Minnesota Intercollegiate Athletic Conference. History The school was founded in 1866, when the Minnesota Conference of Congregational church, Congregational Churches unanimously accepted a resolution to locate a college in Northfield. Two Northfield businessmen, Charles Augustus Wheaton and Charles Moorehouse Goodsell, each donated of land for the first campus. The first students enrolled at the preparatory unit of Northfield College in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beggiatoa
''Beggiatoa'' is a genus of ''Gammaproteobacteria'' belonging to the order '' Thiotrichales'', in the ''Pseudomonadota'' phylum. These bacteria form colorless filaments composed of cells that can be up to 200 μm in diameter, and are one of the largest prokaryotes on Earth. ''Beggiatoa'' are chemolithotrophic sulfur-oxidizers, using reduced sulfur species as an energy source. They live in sulfur-rich environments such as soil, both marine and freshwater, in the deep sea hydrothermal vents, and in polluted marine environments. In association with other sulfur bacteria, e.g. '' Thiothrix'', they can form biofilms that are visible to the naked eye as mats of long white filaments; the white color is due to sulfur globules stored inside the cells. Discovery ''Beggiatoa'' was originally described as a type of blue-green algae (today known as ''Cyanobacteria'') by the botanist Vittore Trevisan in 1842, who named it in honor of the Italian doctor and botanist Francesco Secondo B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodomicrobium
''Rhodomicrobium'' is a microaerobic to anaerobic, purple non-sulfur, cluster-building genus of bacteria. ''Rhodomicrobium'' uses bacteriochlorophyll a and bacteriochlorophyll b for photosynthesis Photosynthesis ( ) is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their metabo ... and occurs in fresh- and sea-water and in soil References Further reading * * * * Hyphomicrobiales Bacteria genera {{Hyphomicrobiales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chromatium
''Chromatium'' is a genus of photoautotrophic Gram-negative bacteria which are found in water. The cells are straight rod-shaped or slightly curved. They belong to the purple sulfur bacteria and oxidize sulfide to produce sulfur which is deposited in intracellular granules of the cytoplasm.George M. Garrity: ''Bergey's Manual of Systematic Bacteriology''. 2. Auflage. Springer, New York, 2005, Volume 2: ''The Proteobacteria, Part B: The Gammaproteobacteria'' References External links''Chromatium'' J.P. Euzéby: List of Prokaryotic names with Standing in Nomenclature Chromatiales Phototrophic bacteria Bacteria genera {{Chromatiales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorobium
''Chlorobium'' is a genus of green sulfur bacteria. They are photolithotrophic oxidizers of sulfur and most notably utilise a noncyclic electron transport chain to reduce NAD+. Photosynthesis is achieved using a Type 1 Reaction Centre using bacteriochlorophyll (BChl) ''a''. Two photosynthetic antenna complexes aid in light absorption: the Fenna-Matthews-Olson complex ("FMO", also containing BChl ''a''), and the chlorosomes which employ mostly BChl ''c'', ''d'', or ''e''. Hydrogen sulfide is used as an electron source and carbon dioxide its carbon source.Prescott, Harley, Klein. (2005). ''Microbiology'' pp. 195, 493, 597, 618-619, 339. ''Chlorobium'' species exhibit a dark green color; in a Winogradsky column, the green layer often observed is composed of ''Chlorobium''. This genus lives in strictly anaerobic conditions below the surface of a body of water, commonly the anaerobic zone of a eutrophic lake. '' Chlorobium aggregatum'' is a species which exists in a symbiotic r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clostridium
''Clostridium'' is a genus of anaerobic, Gram-positive bacteria. Species of ''Clostridium'' inhabit soils and the intestinal tracts of animals, including humans. This genus includes several significant human pathogens, including the causative agents of botulism and tetanus. It also formerly included an important cause of diarrhea, '' Clostridioides difficile'', which was reclassified into the '' Clostridioides'' genus in 2016. History In the late 1700s, Germany experienced several outbreaks of an illness connected to eating specific sausages. In 1817, the German neurologist Justinus Kerner detected rod-shaped cells in his investigations into this so-called sausage poisoning. In 1897, the Belgian biology professor Emile van Ermengem published his finding of an endospore-forming organism he isolated from spoiled ham. Biologists classified van Ermengem's discovery along with other known gram-positive spore formers in the genus ''Bacillus''. This classification presented proble ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypoxia (environmental)
Hypoxia (''hypo'': 'below', ''oxia'': 'oxygenated') refers to low oxygen conditions. Hypoxia is problematic for air-breathing organisms, yet it is essential for many anaerobic organisms. Hypoxia applies to many situations, but usually refers to the atmosphere and natural waters. Atmospheric hypoxia Atmospheric hypoxia occurs naturally at high altitudes. Total atmospheric pressure decreases as altitude increases, causing a lower partial pressure of oxygen, which is defined as hypobaric hypoxia. Oxygen remains at 20.9% of the total gas mixture, differing from hypoxic hypoxia, where the percentage of oxygen in the air (or blood) is decreased. This is common in the sealed burrows of some subterranean animals, such as blesmols. Atmospheric hypoxia is also the basis of altitude training, which is a standard part of training for elite athletes. Several companies mimic hypoxia using normobaric artificial atmosphere. Aquatic hypoxia An aquatic system lacking dissolved oxygen (0% ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
