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Alfred C. Redfield
Alfred Clarence Redfield (November 15, 1890 – March 17, 1983) was an American oceanographer known for having discovered the Redfield ratio, which describes the ratio between nutrients in plankton and ocean water. In 1966, he received the Eminent Ecologist Award from the Ecological Society of America. His research was used by James Lovelock in the formulation of the Gaia hypothesis, that "Organisms and their environment evolve as a single, self-regulating system." From 1918 to 1924, Redfield worked with Elizabeth M. Bright on studies that involved the effects of radiation and ''Nereis''. In collaboration the team published 12 papers. During his doctoral research, he studied the mechanism of horned toad skin coloration, identifying adrenaline as the primary control of skin coloration. He later studied the effects of X rays and radium radiation on the physiological action. Following his graduation, he went on to study marine biology. He studied hemocyanin, which is the bloo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philadelphia, Pennsylvania
Philadelphia, often called Philly, is the List of municipalities in Pennsylvania#Municipalities, largest city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, the List of United States cities by population, sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic (United States), Mid-Atlantic regions after New York City. Act of Consolidation, 1854, Since 1854, the city has been coextensive with Philadelphia County, Pennsylvania, Philadelphia County, the List of counties in Pennsylvania, most populous county in Pennsylvania and the urban core of the Delaware Valley, the Metropolitan statistical area, nation's seventh-largest and one of List of largest cities, world's largest metropolitan regions, with 6.245 million residents . The city's population at the 2020 United States census, 2020 census was 1,603,797, and over 56 million people live within of Philadelphia. Philadelphia was founded in 1682 by William Penn, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oceanography
Oceanography (), also known as oceanology and ocean science, is the scientific study of the oceans. It is an Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, Wind wave, waves, and geophysical fluid dynamics; plate tectonics and the geology of the sea floor; and fluxes of various chemical substances and physical properties within the ocean and across its boundaries. These diverse topics reflect multiple disciplines that oceanographers utilize to glean further knowledge of the world ocean, including astronomy, biology, chemistry, climatology, geography, geology, hydrology, meteorology and physics. Paleoceanography studies the history of the oceans in the geologic past. An oceanographer is a person who studies many matters concerned with oceans, including marine geology, physics, chemistry and biology. History Early history Humans first acquired knowledge of the waves and currents of the seas and oceans in pre-historic times. Obser ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1890 Births
Year 189 ( CLXXXIX) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silanus and Silanus (or, less frequently, year 942 '' Ab urbe condita''). The denomination 189 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Plague (possibly smallpox) kills as many as 2,000 people per day in Rome. Farmers are unable to harvest their crops, and food shortages bring riots in the city. China * Liu Bian succeeds Emperor Ling, as Chinese emperor of the Han Dynasty. * Dong Zhuo has Liu Bian deposed, and installs Emperor Xian as emperor. * Two thousand eunuchs in the palace are slaughtered in a violent purge in Luoyang, the capital of Han. By topic Arts and sciences * Galen publishes his ''"Treatise on the various temperaments"'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Society Of Limnology And Oceanography
The Association for the Sciences of Limnology and Oceanography (ASLO), formerly known as the Limnological Society of America and the American Society of Limnology and Oceanography, is a scientific society established in 1936 with the goal of advancing the sciences of limnology and oceanography. With approximately 4,000 members in nearly 60 different countries, ASLO is the largest scientific society, worldwide, devoted to either limnology or oceanography or both. Journal publications ASLO publishes four scientific journals: * ''Limnology and Oceanography'' * ''Limnology and Oceanography Letters'' * '' Limnology and Oceanography: Methods'' * ''Limnology and Oceanography Bulletin'' ''Limnology and Oceanography: Fluids and Environments'' Much of the content of ASLO journals is open access. In addition to occasional small workshops ASLO hosts regularly scheduled major scientific meetings around the world including the Aquatic Science Meetings, the Ocean Science Meetings, and the S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemocyanin
Hemocyanins (also spelled haemocyanins and abbreviated Hc) are proteins that transport oxygen throughout the bodies of some invertebrate animals. These metalloproteins contain two copper atoms that reversibly bind a single oxygen molecule (O2). They are second only to hemoglobin in frequency of use as an oxygen transport molecule. Unlike the hemoglobin in red blood cells found in vertebrates, hemocyanins are not confined in blood cells but are instead suspended directly in the hemolymph. Oxygenation causes a color change between the colorless Cu(I) deoxygenated form and the blue Cu(II) oxygenated form. Species distribution Hemocyanin was first discovered in '' Octopus vulgaris'' by Leon Fredericq in 1878. The presence of copper in molluscs was detected even earlier by Bartolomeo Bizio in 1833. Hemocyanins are found in the Mollusca and Arthropoda including cephalopods and crustaceans and utilized by some land arthropods such as the tarantula '' Eurypelma californicum'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nereis
''Nereis'' is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. ''Nereis'' possess setae and parapodia for locomotion and gas exchange. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta. They are cylindrical in shape, found not only in sandy areas, and they are adapted to burrow. They often cling to seagrass (posidonia) or other grass on rocks and sometimes gather in large groups. Nereis worms are commonly known as rag worms or clam worms. The body is long, slender, and dorso-ventrally flattened, reaching a length of 5-30 cm. The head consists of two parts: a roughly triangular anterior lobe—the prostomium—and a posterior ring-like portion—the peristomium. The latter bears four pairs of tentacular cirri, dorsally two pairs of eyes, and ventrally a pair of short tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elizabeth M
''Elizabeth M'' was a towboat that sank in the Ohio River on January 9, 2005. The sinking of the vessel resulted in the death of four of the seven crew when the ''Elizabeth M'' accidentally went over the Montgomery Locks and Dam near the Pittsburgh suburb of Industry, Pennsylvania. It was originally named the B.F. Fairless, in honor of Benjamin Franklin Fairless, when it was launched by the Dravo Corporation in 1951. Tragedy The Braddock bound ''Elizabeth M'' was pushing four barges through the lock when the strong current of the river pushed the tug and its load over the dam. High water was partly blamed for the incident. Two of the six crew managed to escape the sinking ship, but four perished, and the last was found weeks later inside the sunken vessel when the ship was raised from the bottom of the river. The sinking of the ''Elizabeth M'' is one of the most recent maritime disasters on the Ohio. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaia Hypothesis
The Gaia hypothesis (), also known as the Gaia theory, Gaia paradigm, or the Gaia principle, proposes that living organisms interact with their inorganic surroundings on Earth to form a synergistic and self-regulating, complex system that helps to maintain and perpetuate the conditions for life on the planet. The hypothesis was formulated by the chemist James Lovelock and co-developed by the microbiologist Lynn Margulis in the 1970s. Lovelock named the idea after Gaia, the primordial goddess who personified the Earth in Greek mythology. The suggestion that the theory should be called "the Gaia hypothesis" came from Lovelock's neighbour, William Golding. In 2006, the Geological Society of London awarded Lovelock the Wollaston Medal in part for his work on the Gaia hypothesis. Topics related to the hypothesis include how the biosphere and the evolution of organisms affect the stability of global temperature, salinity of seawater, atmospheric oxygen levels, the maintenance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Lovelock
James Ephraim Lovelock (26 July 1919 – 26 July 2022) was an English independent scientist, environmentalist and futurist. He is best known for proposing the Gaia hypothesis, which postulates that the Earth functions as a self-regulating system. With a PhD in medicine, Lovelock began his career performing cryopreservation experiments on rodents, including successfully thawing frozen specimens. His methods were influential in the theories of cryonics (the cryopreservation of humans). He invented the electron capture detector, and using it, became the first to detect the widespread presence of chlorofluorocarbons in the atmosphere. While designing scientific instruments for NASA, he developed the Gaia hypothesis. In the 2000s, he proposed a method of climate engineering to restore carbon dioxide–consuming algae. He was an outspoken member of Environmentalists for Nuclear Energy, asserting that fossil fuel interests have been behind opposition to nuclear energy, citing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecological Society Of America
The Ecological Society of America (ESA) is a professional organization of ecological scientists. Based in the United States and founded in 1915, ESA publications include peer-reviewed journals, newsletters, fact sheets, and teaching resources. It holds an annual meeting at different locations in the USA and Canada. In addition to its publications and annual meeting, ESA is engaged in public policy, science, education and diversity issues. ESA's 9,000 members are researchers, educators, natural resource managers, and students in over 90 countries. Members work on a wide range of topics, from agroecology to marine diversity and explore the relationships between organisms and their past, present, and future environments. The Society has over 20 topical sections and seven regional chapters. History The first discussions on the formation of the Society took place in 1914 in the lobby of the Hotel Walton in Philadelphia, Pennsylvania, at a meeting of animal and plant ecologists org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Of America
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvania
Pennsylvania (; (Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio to its west, Lake Erie and the Canadian province of Ontario to its northwest, New York to its north, and the Delaware River and New Jersey to its east. Pennsylvania is the List of U.S. states and territories by population, fifth-most populous state in the nation with over 13 million residents 2020 United States census, as of 2020. It is the List of U.S. states and territories by area, 33rd-largest state by area and ranks List of states and territories of the United States by population density, ninth among all states in population density. The southeastern Delaware Valley metropolitan area comprises and surrounds Philadelphia, the state's List of cities in Pennsylvania, largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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