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Portal de ciencia
La ciencia (de lapalabra latina scientia , que significa "conocimiento") es una empresa sistemática que construye y organiza el conocimiento en forma de explicaciones y predicciones comprobables sobre el universo .
Las primeras raíces de la ciencia se remontan al Antiguo Egipto y Mesopotamia alrededor del 3500 al 3000 a. C. Sus contribuciones a las matemáticas , la astronomía y la medicina entraron y dieron forma a la filosofía natural griega de la antigüedad clásica , mediante la cual se hicieron intentos formales para proporcionar explicaciones de los eventos en el mundo físico basadas en causas naturales. Después de la caída del Imperio Romano Occidental , el conocimiento de las concepciones griegas del mundo se deterioró en Europa Occidental durante los primeros siglos (400 a 1000 d.C.) de la Edad Media., pero se conservó en el mundo musulmán durante la Edad de Oro islámica . La recuperación y asimilación de las obras griegas y las investigaciones islámicas en Europa occidental desde los siglos X al XIII revivieron la " filosofía natural ", que más tarde fue transformada por la Revolución científica que comenzó en el siglo XVI cuando nuevas ideas y descubrimientos partieron de las concepciones griegas anteriores y tradiciones. El método científico pronto jugó un papel más importante en la creación de conocimiento y no fue hasta el siglo XIX cuando muchos de los profesionales institucionales y profesionaleslas características de la ciencia comenzaron a tomar forma; junto con el cambio de "filosofía natural" a "ciencia natural".
La ciencia moderna se divide típicamente en tres ramas principales que consisten en las ciencias naturales (por ejemplo, biología , química y física ), que estudian la naturaleza en el sentido más amplio; las ciencias sociales (por ejemplo, economía , psicología y sociología ), que estudian a los individuos y las sociedades; y las ciencias formales (por ejemplo, lógica , matemáticas e informática teórica), que estudian conceptos abstractos. Sin embargo, existe un desacuerdo sobre si las ciencias formales realmente constituyen una ciencia, ya que no se basan en pruebas empíricas . Las disciplinas que utilizan el conocimiento científico existente con fines prácticos, como la ingeniería y la medicina, se describen como ciencias aplicadas .
La ciencia se basa en la investigación , que comúnmente la realizan científicos que trabajan en instituciones académicas y de investigación , agencias gubernamentales y empresas . El impacto práctico de la investigación científica ha llevado al surgimiento de políticas científicas que buscan influir en la empresa científica priorizando el desarrollo de productos comerciales , armamento , atención médica , infraestructura pública y protección ambiental . ( Artículo completo ... )
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Los terremotos de Nazko de 2007-2008 fueron una serie de pequeños terremotos volcánicos que midieron menos de 4.0 en la escala de magnitud de Richter . Ocurrieron en el área escasamente poblada de Nazko del interior central de la Columbia Británica , Canadá , a partir del 9 de octubre de 2007 y terminando el 12 de junio de 2008. Ocurrieron justo al oeste de Nazko Cone , un pequeño cono de ceniza cubierto de árboles que entró en erupción por última vez. hace unos 7.200 años.
No hubo daños ni víctimas como resultado de los terremotos de Nazko, que fueron demasiado pequeños para que la gente los sintiera, pero los sismógrafos locales los registraron. losEl enjambre de terremotos ocurrió en el extremo oriental de una zona volcánica conocida llamada Cinturón Volcánico de Anahim . Esta es una línea de tendencia este-oeste de formaciones volcánicas que se extiende desde la Costa Central hasta el Interior Central de Columbia Británica. ( Artículo completo ... )
Lactarius torminosus, commonly known as the woolly milkcap or the bearded milkcap, is a large agaric fungus. A common and widely distributed species, it is found in North Africa, northern Asia, Europe, and North America. It was first described scientifically by Jacob Christian Schäffer in 1774 as an Agaricus, and later transferred to the genus Lactarius in 1821 by Samuel Frederick Gray. A variety, L. torminosus var. nordmanensis, is known from the United States, Canada, and Switzerland. L. torminosus officially became the type species of Lactarius in 2011 after molecular studies prompted the taxonomic reshuffling of species between several Russulaceae genera.
A mycorrhizal species, L. torminosus associates with various trees, most commonly birch, and its fruit bodies (mushrooms) grow on the ground singly or in groups in mixed forests. The caps of L. torminosus mushrooms are convex with a central depression, and attain a diameter of up to 10 cm (3.9 in). A blend of pink and ochre hues, the cap sometimes has concentric zones of alternating lighter and darker shades. The edge of the cap is rolled inward, and shaggy when young. On the underside of the cap are narrow flesh-colored gills that are crowded closely together. The cylindrical stem is a pale flesh color with a delicately downy surface and brittle flesh; it is up to 8 cm (3.1 in) long and 0.6–2 cm (0.2–0.8 in) thick. When cut or injured, the fruit bodies ooze a bitter white latex that does not change color upon exposure to air. The variety nordmanensis, in contrast, has latex that changes from white to yellow. Lactarius torminosus can be distinguished from similar species like L. pubescens or L. villosus by differences in morphology and coloration, or by microscopic characteristics like spore shape and size. (Full article...)- View of trailing hemisphere in natural color
Enceladus (/ɛnˈsɛlədəs/) is the sixth-largest moon of Saturn. It is about 500 kilometers (310 mi) in diameter, about a tenth of that of Saturn's largest moon, Titan. Enceladus is mostly covered by fresh, clean ice, making it one of the most reflective bodies of the Solar System. Consequently, its surface temperature at noon only reaches −198 °C (−324 °F), far colder than a light-absorbing body would be. Despite its small size, Enceladus has a wide range of surface features, ranging from old, heavily cratered regions to young, tectonically deformed terrains.
Enceladus was discovered on August 28, 1789, by William Herschel, but little was known about it until the two Voyager spacecraft, Voyager 1 and Voyager 2, passed nearby in 1980 and 1981. In 2005, the Cassini spacecraft started multiple close flybys of Enceladus, revealing its surface and environment in greater detail. In particular, Cassini discovered water-rich plumes venting from the south polar region. Cryovolcanoes near the south pole shoot geyser-like jets of water vapor, molecular hydrogen, other volatiles, and solid material, including sodium chloride crystals and ice particles, into space, totaling about 200 kg (440 lb) per second. Over 100 geysers have been identified. Some of the water vapor falls back as "snow"; the rest escapes, and supplies most of the material making up Saturn's E ring. According to NASA scientists, the plumes are similar in composition to comets. In 2014, NASA reported that Cassini found evidence for a large south polar subsurface ocean of liquid water with a thickness of around 10 km (6 mi). (Full article...) - High-precision test of general relativity by the Cassini space probe (artist's impression): radio signals sent between the Earth and the probe (green wave) are delayed by the warping of spacetime (blue lines) due to the Sun's mass.
General relativity is a theory of gravitation developed by Albert Einstein between 1907 and 1915. The theory of general relativity says that the observed gravitational effect between masses results from their warping of spacetime.
By the beginning of the 20th century, Newton's law of universal gravitation had been accepted for more than two hundred years as a valid description of the gravitational force between masses. In Newton's model, gravity is the result of an attractive force between massive objects. Although even Newton was troubled by the unknown nature of that force, the basic framework was extremely successful at describing motion. (Full article...)
Yellowstone National Park is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first national park in the U.S. and is also widely held to be the first national park in the world. The park is known for its wildlife and its many geothermal features, especially Old Faithful geyser, one of its most popular. While it represents many types of biomes, the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion.
Although Native Americans have lived in the Yellowstone region for at least 11,000 years, aside from visits by mountain men during the early-to-mid-19th century, organized exploration did not begin until the late 1860s. Management and control of the park originally fell under the jurisdiction of the United States Department of the Interior, the first Secretary of the Interior to supervise the park being Columbus Delano. However, the U.S. Army was eventually commissioned to oversee management of Yellowstone for a 30-year period between 1886 and 1916. In 1917, administration of the park was transferred to the National Park Service, which had been created the previous year. Hundreds of structures have been built and are protected for their architectural and historical significance, and researchers have examined more than a thousand archaeological sites. (Full article...)- Ben Gascoigne at the Stromlo Observatory, 1948
Sidney Charles Bartholemew "Ben" Gascoigne AO (11 November 1915 – 25 March 2010) was a New Zealand-born Australian optical astronomer and expert in photometry who played a leading role in the design and commissioning of Australia's largest optical telescope, the Anglo-Australian Telescope, which for a time was one of the world's most important astronomical facilities. Born in Napier, New Zealand, Gascoigne trained in Auckland and at the University of Bristol, before moving to Australia during World War II to work at the Commonwealth Solar Observatory at Mount Stromlo in Canberra. He became skillful in the design and manufacture of optical devices such as telescope elements.
Following the war, Gascoigne and astronomer Gerald Kron used newly modernised telescopes at Mount Stromlo to determine that the distance between our galaxy and the Magellanic Cloud dwarf galaxies had been underestimated by a factor of two. Because this measurement was used to calibrate other distances in astronomy, the result effectively doubled the estimated size of the universe. They also found that star formation in the Magellanic Clouds had occurred more recently than in the Milky Way; this overturned the prevailing view that both had evolved in parallel. A major figure at Mount Stromlo Observatory, Gascoigne helped it develop from a solar observatory to a centre of stellar and galactic research, and was instrumental in the creation of its field observatory in northern New South Wales, Siding Spring Observatory. When the British and Australian governments agreed to jointly build the Anglo-Australian Telescope at Siding Spring, Gascoigne was involved from its initial conception and throughout its lengthy commissioning, taking its first photograph. Gascoigne was made an Officer of the Order of Australia for his contributions to astronomy and to the Anglo-Australian Telescope. (Full article...) - Common octopus
(Octopus vulgaris)
The octopus (plural octopuses) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ɒkˈtɒpədə/, ok-TO-pə-də). Around 300 species are recognised, and the order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the center point of the eight limbs. The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.
Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived. In most species, the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes senescent and dies, while the female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Strategies to defend themselves against predators include the expulsion of ink, the use of camouflage and threat displays, the ability to jet quickly through the water and hide, and even deceit. All octopuses are venomous, but only the blue-ringed octopuses are known to be deadly to humans. (Full article...) - Ann Bannon in 1983. Photo by Tee Corinne.
Ann Weldy (born September 15, 1932), better known by her pen name Ann Bannon, is an American author who, from 1957 to 1962, wrote six lesbian pulp fiction novels known as The Beebo Brinker Chronicles. The books' enduring popularity and impact on lesbian identity has earned her the title "Queen of Lesbian Pulp Fiction". Bannon was a young housewife trying to address her own issues of sexuality when she was inspired to write her first novel. Her subsequent books featured four characters who reappeared throughout the series, including her eponymous heroine, Beebo Brinker, who came to embody the archetype of a butch lesbian. The majority of her characters mirrored people she knew, but their stories reflected a life she did not feel she was able to live. Despite her traditional upbringing and role in married life, her novels defied conventions for romance stories and depictions of lesbians by addressing complex homosexual relationships.
Her books shaped lesbian identity for lesbians and heterosexuals alike, but Bannon was mostly unaware of their impact. She stopped writing in 1962. Later, she earned a doctorate in linguistics and became an academic. She endured a difficult marriage for 27 years and, as she separated from her husband in the 1980s, her books were republished; she was stunned to learn of their influence on society. They were released again between 2001 and 2003 and were adapted as an award-winning Off-Broadway production. They are taught in Women's and LGBT studies courses, and Bannon has received numerous awards for pioneering lesbian and gay literature. She has been described as "the premier fictional representation of US lesbian life in the fifties and sixties", and it has been said that her books "rest on the bookshelf of nearly every even faintly literate Lesbian". (Full article...) - Photomicrograph of Giemsa-stained Trypanosoma cruzi
Chagas disease, also known as American trypanosomiasis, is a tropical parasitic disease caused by Trypanosoma cruzi. It is spread mostly by insects known as Triatominae, or "kissing bugs". The symptoms change over the course of the infection. In the early stage, symptoms are typically either not present or mild, and may include fever, swollen lymph nodes, headaches, or swelling at the site of the bite. After four to eight weeks, untreated individuals enter the chronic phase of disease, which in most cases does not result in further symptoms. Up to 45% of people with chronic infection develop heart disease 10–30 years after the initial illness, which can lead to heart failure. Digestive complications, including an enlarged esophagus or an enlarged colon, may also occur in up to 21% of people, and up to 10% of people may experience nerve damage.
T. cruzi is commonly spread to humans and other mammals by the bite of a kissing bug. The disease may also be spread through blood transfusion, organ transplantation, eating food contaminated with the parasites, and vertical transmission (from a mother to her baby). Diagnosis of early disease is by finding the parasite in the blood using a microscope or detecting its DNA by polymerase chain reaction. Chronic disease is diagnosed by finding antibodies for T. cruzi in the blood. It affects more than 150 types of animals. (Full article...) - Glicken at work
Harry Glicken (March 7, 1958 – June 3, 1991) was an American volcanologist. He researched Mount St. Helens in the United States before and after its 1980 eruption, and was very distraught about the death of fellow volcanologist David A. Johnston, who had switched shifts with Glicken so that the latter could attend an interview. In 1991, while conducting avalanche research on Mount Unzen in Japan, Glicken and fellow volcanologists Katia and Maurice Krafft were killed by a pyroclastic flow. His remains were found four days later, and were cremated in accordance with his parents' request. Glicken and Johnston remain the only American volcanologists known to have died in volcanic eruptions.
Despite a long-term interest in working for the United States Geological Survey, Glicken never received a permanent post there because employees found him eccentric. Conducting independent research from sponsorships granted by the National Science Foundation and other organizations, Glicken accrued expertise in the field of volcanic debris avalanches. He also wrote several major publications on the topic, including his doctoral dissertation based on his research at St. Helens titled "Rockslide-debris Avalanche of May 18, 1980, Mount St. Helens Volcano, Washington" that initiated widespread interest in the phenomenon. Since being published posthumously by Glicken's colleagues in 1996, the report has been acknowledged by many other publications on debris avalanches. Following his death, Glicken was praised by associates for his love of volcanoes and commitment to his field. (Full article...)
The 1941 Florida hurricane was a compact but strong tropical cyclone that affected the Bahamas, Florida, and the southeastern United States in October 1941. The fifth known storm of the 1941 Atlantic hurricane season, it was first observed to the north of the Virgin Islands on October 3. The storm tracked generally westward, reaching peak winds of 120 miles per hour (193 km/h) before passing through the Bahamas. After weakening somewhat, the storm later passed across southern Florida with winds of 100 mph (161 km/h). The hurricane then emerged into the Gulf of Mexico as a tropical storm, but regained hurricane intensity and made another landfall along the Florida Panhandle. Turning northeast, it crossed Georgia and South Carolina, and entered the Atlantic Ocean on October 8.
In advance of the storm, preparations were extensive; residents boarded up homes and businesses, while evacuations were recommended in some coastal areas. In the Bahamas, where winds reached 104 mph (167 km/h), the storm killed three people. The city of Nassau was struck particularly hard. In Florida, damage was relatively severe, and included the deaths of several people. High winds brought down trees and power lines, though the storm was characterized by highly unusual rainfall patterns. In the Everglades region, a storm surge flooded local streets. As the storm progressed northward, the city of Tallahassee suffered widespread power outages and damage to numerous vehicles. Throughout the state, the hurricane inflicted US$675,000 ($11.7 million 2011 USD) in damage. The cyclone later killed one person in Georgia. (Full article...)
The marsh rice rat (Oryzomys palustris) is a semiaquatic North American rodent in the family Cricetidae. It usually occurs in wetland habitats, such as swamps and salt marshes. It is found mostly in the eastern and southern United States, from New Jersey and Kansas south to Florida and northeasternmost Tamaulipas, Mexico; its range previously extended further west and north, where it may have been a commensal in corn-cultivating communities. Weighing about 40 to 80 g (1.4 to 2.8 oz), the marsh rice rat is a medium-sized rodent that resembles the common black and brown rat. The upperparts are generally gray-brown, but are reddish in many Florida populations. The feet show several specializations for life in the water. The skull is large and flattened, and is short at the front.
John Bachman discovered the marsh rice rat in 1816, and it was formally described in 1837. Several subspecies have been described since the 1890s, mainly from Florida, but disagreement exists over their validity. The Florida Keys population is sometimes classified as a different species, the silver rice rat (Oryzomys argentatus). Data from the mitochondrial cytochrome b gene indicate a deep divergence between populations east of Mississippi and those further west, which suggests that the western populations may be recognized as a separate species, Oryzomys texensis. The species is part of the genus Oryzomys, which also includes several others occurring further south in Mexico, Central America, and northwestern South America, some of which have previously been regarded as subspecies of the marsh rice rat. One, Oryzomys couesi, occurs with the marsh rice rat in Tamaulipas and southern Texas. (Full article...)
The camas pocket gopher (Thomomys bulbivorus), also known as the camas rat or Willamette Valley gopher, is a rodent, the largest member in the genus Thomomys, of the family Geomyidae. First described in, it is endemic to the Willamette Valley of northwestern Oregon in the United States. The herbivorous gopher forages for vegetable and plant matter, which it collects in large, fur-lined, external cheek pouches. Surplus food is hoarded in an extensive system of tunnels. The dull-brown-to-lead-gray coat changes color and texture over the year. The mammal's characteristically large, protuberant incisors are well adapted for use in tunnel construction, particularly in the hard clay soils of the Willamette Valley. The gophers make chattering sounds with their teeth; males and females make purring (or crooning) sounds when they are together, and the young make twittering sounds. Born toothless, blind and hairless, the young grow rapidly before being weaned at about six weeks of age.
Although the camas pocket gopher is fiercely defensive when cornered, it may become tame in captivity. While population trends are generally stable, threats to the species' survival include urbanization, habitat conversion for agricultural use and active attempts at eradication with trapping and poisons. It is prey for raptors and carnivorous mammals, and host to several parasitic arthropods and worms. Scientists believe that the gopher's evolutionary history was disrupted when the Missoula Floods washed over the Willamette Valley at the end of the last ice age. The floods almost completely inundated its geographic range, which may have caused a genetic bottleneck as survivors repopulated the region after the waters receded. (Full article...)- Sumatran rhinoceros at Sumatran Rhino Sanctuary in Lampung, Indonesia
The Sumatran rhinoceros, also known as the hairy rhinoceros or Asian two-horned rhinoceros (Dicerorhinus sumatrensis), is a rare member of the family Rhinocerotidae and one of five extant species of rhinoceros. It is the only extant species of the genus Dicerorhinus. It is the smallest rhinoceros, although it is still a large mammal; it stands 112–145 cm (3.67–4.76 ft) high at the shoulder, with a head-and-body length of 2.36–3.18 m (7.7–10.4 ft) and a tail of 35–70 cm (14–28 in). The weight is reported to range from 500 to 1,000 kg (1,100 to 2,200 lb), averaging 700–800 kg (1,540–1,760 lb), although there is a single record of a 2,000 kg (4,410 lb) specimen. Like both African species, it has two horns; the larger is the nasal horn, typically 15–25 cm (5.9–9.8 in), while the other horn is typically a stub. A coat of reddish-brown hair covers most of the Sumatran rhino's body.
Members of the species once inhabited rainforests, swamps, and cloud forests in India, Bhutan, Bangladesh, Myanmar, Laos, Thailand, Malaysia, Indonesia, and China. In historical times, they lived in southwest China, particularly in Sichuan. They are now critically endangered, with only five substantial populations in the wild: four in Sumatra and one in Borneo. Their numbers are difficult to determine because they are solitary animals that are widely scattered across their range, but they are estimated to number fewer than 80. The species was completely extirpated from Malaysia in 2019, and one of the Sumatran populations may already be extinct. In 2015, researchers announced that the Bornean rhinoceros had become extinct from the northern part of Borneo (Sabah, Malaysia); however, a tiny population was discovered in East Kalimantan in early 2016. (Full article...) - Male in breeding plumage
subspecies cyanochlamys
The superb fairywren (Malurus cyaneus) is a passerine bird in the Australasian wren family, Maluridae, and is common and familiar across south-eastern Australia. It is a sedentary and territorial species, also exhibiting a high degree of sexual dimorphism; the male in breeding plumage has a striking bright blue forehead, ear coverts, mantle, and tail, with a black mask and black or dark blue throat. Non-breeding males, females and juveniles are predominantly grey-brown in colour; this gave the early impression that males were polygamous, as all dull-coloured birds were taken for females. Six subspecies groups are recognized: three larger and darker forms from Tasmania, Flinders and King Island respectively, and three smaller and paler forms from mainland Australia and Kangaroo Island.
Like other fairywrens, the superb fairywren is notable for several peculiar behavioural characteristics; the birds are socially monogamous and sexually promiscuous, meaning that although they form pairs between one male and one female, each partner will mate with other individuals and even assist in raising the young from such pairings. Male wrens pluck yellow petals and display them to females as part of a courtship display. (Full article...)
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| Crédito: NASA |
La Vía Láctea es una galaxia espiral barrada del Grupo Local . Aunque la Vía Láctea no es más que una de los miles de millones de galaxias del universo , la galaxia tiene un significado especial para la humanidad ya que es el hogar del Sistema Solar . El término "lechoso" se origina en la banda nebulosa de luz blanca que aparece a través de la esfera celeste visible desde la Tierra , que está compuesta de estrellas y otro material que se encuentra dentro del plano galáctico . El hecho de que la Vía Láctea divide el cielo nocturno en dos hemisferios aproximadamente iguales indica que el sistema solar se encuentra cerca del plano galáctico.
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Gregor Mendel (1822-1884) fue un monje austríaco a quien a menudo se le llama el "padre de la genética " por su estudio de la herencia de rasgos en las plantas de guisantes . Mendel demostró que existía una herencia particular de rasgos de acuerdo con sus leyes de herencia .
No fue hasta principios del siglo XX que se dio cuenta de la importancia de sus ideas. En 1900, su obra fue redescubierta por Hugo de Vries , Carl Correns y Erich von Tschermak . Sus resultados se replicaron rápidamente y el vínculo genético se resolvió rápidamente. Los biólogos acudieron en masa a la teoría, si bien aún no era aplicable a muchos fenómenos, buscaba dar una comprensión genotípica de la herencia que, en su opinión, faltaba en estudios previos de herencia, que se centraban en enfoques fenotípicos .
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Sabías...
- ... que en los últimos años las bebidas alcohólicas mediterráneas (en la foto) han sido objeto de un intenso estudio científico ?
- ... que se ha medido que el agujero negro supermasivo en el centro del quásar OJ287 pesa 18 mil millones de veces la masa del Sol , seis veces más pesado que el poseedor del récord anterior?
- ... que los orígenes de Castle Lake (en la foto ) en California se remontan al Pleistoceno (hace más de 10.000 años) cuando un glaciar excavó una cuenca en la ubicación del lago actual?
- ... que el huracán Elida de 2002 fue el primer huracán observado por el sensor MERIS a bordo del satélite Envisat de la ESA ?
- ... que para un movimiento de onda puro en dinámica de fluidos , la velocidad de deriva de Stokes es la velocidad promedio cuando se sigue una parcela de fluido específica mientras viaja con el flujo de fluido?
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