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  • barrameda.com.ar
    Calificación del usuario 43 Publicado por Administrador viernes 31 de enero de 2014 Es evidente que el clima de la Tierra está cambiando rápidamente Día a día se baten récords de catástrofes naturales Las temperaturas se alteran Hasta hace poco las estaciones tenían una gran influencia en la tradición de los pueblos y aquel sabio Refranero popular que durante generaciones había regido la vida de nuestros antepasados ha perdido su sentido Leer más Apple patenta nuevo método para recargar dispositivos con energía solar Calificación del usuario 36 Publicado por Administrador jueves 30 de enero de 2014 La firma de Cupertino presentó un documento que detalla el uso de este tipo de energía que vía USB podrían utilizar iPhones iPads iPods y MacBooks adaptándose a ellos A pesar de los perpetuos avances en términos de procesamiento gráficos conectividad memoria funcionalidades etc a lo largo de esta década la autonomía de las baterías no logra despegar y sigue siendo el talón de Aquiles de la industria móvil Leer más Screw You Original forma de reutilizar botellas PET Calificación del usuario 47 Publicado por Administrador miércoles 29 de enero de 2014 El Studio David Graas ha sacado al mercado otra forma de reutilizar botellas PET Screw You Una colección de productos que buscan darle una segunda vida a las botellas PET hacer un uso inteligente del cuello de las botellas así simplemente atornillándolas se pueden transformar en objetos como floreros organizadores de comida en forma de perro o un camión de juguete Leer más La geoingeniería podría reducir lluvia vital en algunas zonas del mundo Calificación del usuario 35 Publicado por Administrador martes 28 de enero de 2014 Ante el alto nivel de fracaso de las medidas que se han intentado imponer para paliar el calentamiento global y teniendo en cuenta que éste

    Original URL path: http://www.barrameda.com.ar/dp/ (2014-02-03)
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  • Foros barrameda.com.ar
    UNA PILA CONSUME 50 VECES MÁS ENERGÍA QUE LA QUE PRODUCE DESDE QUE SE PRODUCEN LOS ALIMENTOS HASTA QUE EL CUERPO LOS EXCRETA SE GENERAN 2 TONELADAS DE CO2 POR PERSONA LLEVA TUS PROPIAS BOLSAS DE TELA NO A LAS BOLSAS DE PLÁSTICO Búsqueda personalizada Puedes encontrarnos en puedes o recomendarnos en Google Acordes Partituras Tablaturas Guitarra Letras de canciones Biografías Letras de canciones Letras traducidas Letras de canciones Significado

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  • Resultados de la búsqueda con Google
    USO DE ARTÍCULOS RETORNABLES EN LUGAR DE LOS DESCARTABLES USA CARTUCHOS RECICLADOS EN TU IMPRESORA PRIORIZA EL USO DE PILAS RECARGABLES GUARDA LAS PILAS EN UN RECIPIENTE PLÁSTICO HASTA LLEVARLAS AL CENTRO DE RECOLECCIÓN FABRICAR UNA PILA CONSUME 50 VECES MÁS ENERGÍA QUE LA QUE PRODUCE DESDE QUE SE PRODUCEN LOS ALIMENTOS HASTA QUE EL CUERPO LOS EXCRETA SE GENERAN 2 TONELADAS DE CO2 POR PERSONA LLEVA TUS PROPIAS BOLSAS DE TELA NO A LAS BOLSAS DE PLÁSTICO Los comentarios son editados con el fin de preservar la integridad del idioma Se procede a la correción ortográfica y gramatical respetándose los conceptos volcados Please enable JavaScript to view the comments powered by Disqus blog comments powered by Disqus Búsqueda personalizada Puedes encontrarnos en puedes o recomendarnos en Google Acordes Partituras Tablaturas Guitarra Letras de canciones Biografías Letras de canciones Letras traducidas Letras de canciones Significado de letras de canciones Fotos de amor Ciencia ecología tecnología Alerta Meteorológico Rosario El universo Geografía Argentina La biología La botánica La zoología La ecología What is ecology O que é ecologia Principal Secciones Animales en extinción Qué es la ecología Versión en español English version Portuguese version Entorno conceptual El universo Geografía argentina La

    Original URL path: http://www.barrameda.com.ar/buscagoogle.htm (2014-02-03)
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  • The ecosystems
    ecological niche is the way in which an organism is related to the biotic and abiotic factors of its environment It includes the physical training conditions chemical and biological that species needs to live and to reproduce in an ecosystem The temperature the humidity and the light are some of the physical and chemical factors that determine the niche of species Between the biological conditioners they are the type of feeding the predators the competitors and the diseases that is to say species that compete by the same conditions A dynamic unit The ecosystem experiences constants modifications that sometimes are temporary and other cyclical ones they are repeated in the time The biotic elements can react before a change of the physical conditions of environment for example the deforestation of a forest or a fire has direct consequences on the fertility of the ground and affects the food web too In an aquatic ecosystem the biodiversity or the number of vegetal and animals species that live in him is minor than in a terrestrial one The nutritious base is in the phytoplankton and zooplankton The scale goes in ascent from the fish and batrachians to the aquatic birds like the duck and aerial like the eagle The ecological succession The ecological succession is the replacement of some elements of the ecosystem by others in the course of the time Thus a certain area is colonized by more and more complex vegetal species If the environment allow it the appearance of mosses and lichens is happened by grass soon by shrubs and finally by trees The state of balance reached once the evolution has been completed denominates climax In him the modifications occur between the members of same species for example new trees replace the old ones There are two types of successions primary and secondary First it happens when start from a land in where never there was life This type of process can last thousands of years The secondary succession is the one that is registered after a disturbance for example a fire In this case the environment contains organic nutrients and remainders that facilitate the growth of vegetables In a trofic pyramid the nourishing structure of an ecosystem is appraised in where they coexist producing consuming and decomposers The vegetables elaborate organic matter through the photosynthesis The herbivorous are fed on them and they are eaten as well by carnivorous pregivers or When these organisms are dying their rest are transformed into assimilable substances by it plants process in which takes part the decomposers organisms PREDATORS CARNÍVORES HERBIVOROUS PRODUCERS DECOMPOSERS The food web In the operation of the ecosystems it doesn t happen waste some all the organisms died or alive are potential food source for other beings An insect feeds itself on a leaf a bird eats the insect and simultaneously is devoured by a zoo bird When dying these organisms are consumed by the decomposers that will transform them into inorganic substances These relations between the

    Original URL path: http://www.barrameda.com.ar/ecology/the-ecosystem.htm (2014-02-03)
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  • Individuals and populations
    example the set of populations of ants and beetles of the ecosystem forest constitute a community of insects of itself The interaction between the species Each species has a function and occupies a place in the physical space The relations between individuals of different species can be of competition predation parasitism and cooperation Competition relation exists when the individuals must fight in the environment to appropriate themselves a certain resource that can be the space the light the security the food etc The predation relation is that in which an organism captures other to nourish itself of him The parasitism happens when an organism feeds itself on another one living on him or in its interior during every or the most part of the life of the other For example it is parasitic of the dog the tick Main terrestrial biomes In the cooperation the individuals of two species are associate receiving some type of benefit that could not separately be reached The biosphere The biosphere is the part of the Earth where the alive beings are developed It covers from 8 or 10 km on the level of the sea to few meters of depth in the ground where the roots of the plants arrive to absorb minerals It also includes waters of the oceans from its surface to the deepest regions In all its extension it measures around 20 km The aquatic environment where the life was originated are two the see abundant in salts and the one of fresh water with few salts Two characteristics of them are the density of the water that is an appropriate support for the organisms and simultaneously an obstacle for its movements and the depth This last one related to the amount of light that breaks through from the surface determines the existence or non existence of plants Remarkable differences appear between the terrestrial environment and the aquatic one The muscular force to move by the ground climbing or walking must be greater than the one than it is needed in the water Before it most of the animals species that occupied the ground had to develop extremities apt for the locomotion They do not lack nevertheless crawl forms that in general are limited to the surface of the ground and its interior The aerial environment are colonized so much by plants as by animals The vegetables resort to the air for the dissemination of the seeds o which allows them to extend the area of dispersion of the species The animals better adapted to that environment have developed two characteristics light corporal structures and organs adapted for the movement in the heights generally wings or membranes Biomes All ecological space that shares the same species climate animals and plants is a biome The surface of the planet is divided in biomes defined by the characteristics of humidity temperature and annual precipitations Every biome has a certain vegetation and its limits is demarcated by diverse factors among them the availability or

    Original URL path: http://www.barrameda.com.ar/ecology/the-alives.htm (2014-02-03)
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  • Tropical rainforests
    not fertile in the rainforest since the organic matter quickly is disturbed by the heat and the humidity and the nutrients are washed in intense rains In addition it remains humid since the thick foliage absorbs almost all the light and it doesn t allow the passage of solar rays towards the interior The visibility reaches about 20 meters A thick vegetation The dominant vegetation is arboreal with units of 20 up to 40 meters of height Against which it is believed the trees of high trunks without low branches integrate a landscape in which it is relatively easy to move Also the epiphyte plants that live on the surface of others plants like the typical lianas the ferns the shrubs and other infinite species abound It even prosper forms of life pertaining to the kingdom of the fungi the protistas and the moneras Other characteristic is that because there is not cold climate the plants conserve their foliage all the year Most of the vegetation consists of hard wood trees with very few herbaceous plants Oppositely to some wooded zones of Europe or North America where there are few predominant arboreal species and sometimes a single one for example pine groves in the virgin forest it prosper one hundred different species from trees by hectare Usually there are two levels of height superior that reaches to 30 and more meters and underbrush that arrives until 15 meters The lianas the ferns plants with flowers and certain seaweed and mosses can grow in the rainforest but only in the zone of greater height where they receive sufficient light GEOGRAPHIC DISTRIBUTION OF THE FORESTS In biome rainforest is represented the three ground layers or horizons A B and C Abundant rains favour the washing of minerals which determines a non fertile ground and the accumulation of oxide of iron and aluminium give it that particular reddish colour The tropical fauna The rainforest animals live in the different layers or strips from vegetation adapted to their characteristics The prey birds nest in the glasses of the trees Below them are the monkeys the parrots and the toucans that coexist with butterflies and colourful flowers At level of the ground live the antelopes wild boars lizards and serpents toads frogs and felines some of which also climb to the trees The grasshoppers beetles ants termites and others of great size are numerous In order to have an idea of the rainforest biodiversity it is possible to be considered that in 10 km2 of surface can coexist 760 species of trees 125 of mammals 400 of birds 100 of reptiles and 60 of amphibians In a single tree 400 species of insects can be counted The prehistoric forests According to the theory of Charles Darwin on the evolution of the species the ancestors of the man evolved from primates who inhabited in forests and tropical rainforests where fed themselves on wild stems leaves roots seeds and fruits The hominid ones group of primates in

    Original URL path: http://www.barrameda.com.ar/ecology/the-rainforests.htm (2014-02-03)
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  • Temperate forest
    the year but in the winter it falls as snow The aggravating factor is the water because a period of the year exists in which the precipitations are smaller To be remote of the tropical zone is subject to the change of the stations The development of shrub and herbaceous vegetation in this biome facilitated by the falling leaf in winter that allows that the solar rays reach the ground during the rest of the year The sedimentation of dead leaves contributes to mineral salts and organic matter that fertilize the ground Another important characteristic of the temperate forest is the diversity of animal species birds rodents red deers wild boars and bears among others in the North hemisphere and in general smaller species that occupy equivalent ecological niches in the south The herbivorous consume grass fruits and berries and serve as food to the pregivers The man finds in this biome an important source of income Of the reserves of the forest raw materials for the industries nutritional lumber wastebasket and pharmaceutics are extracted The forests also serve like containment means and regulation of the water volumes conserves the quality of grounds and it protect them of the erosion In another aspect they contribute to maintain the heat balance of the Earth when absorbing present carbon dioxide in the atmosphere In the temperate forest coexist among other species birds rodents foxes red deers and bears consequently the cutting of trees not only it affects vegetal species sometimes but animals also causing extinction risks The ground of the temperate forest has a high content of organic matter that is fundamentally accumulated in the first two undercoat which is demonstrated by the dark colour of the same ones GEOGRAPHIC DISTRIBUTION OF THE FORESTS The caducifolio forest In the North hemisphere the caducifolio forest is located around the 50 of North latitude It is characterized by a mixed vegetal formation and by the abundance of trees that fall during the cold season The main arboreal species are the oaks the brown the linden trees the maples the elm trees the hazels and the cherry trees In the caducifolio forest lives red wild boars squirrels and red deers that are herbivorous and savage foxes bears and other carnivorous mammals Between the birds are cuckoos red headed and doves that feeds on seeds and insects and others of plundering like the sparrow hawks that look for small birds An example of this biome is the forests Andean patagonik that occupy an extension of 63 000 km2 between Argentine and Chile The principal trees are the lenga the ñire the araucaria the coihue the larch and the arrayán in the chilean slope very humid lichens and fungi also abound Between the animals they are the red fox the pudú huemul or patagonik red deer the cóndor and others some of them in extinction danger The coniferous forest The coniferous forest extends between the limit of the tundra and the 50 of N latitude in Europe

    Original URL path: http://www.barrameda.com.ar/ecology/temperate-forest.htm (2014-02-03)
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  • Savanna
    68 to 86 F are registered with annual rainfall is from about 10 30 inches per year A certain affluent border between the forest and the savanna does not exist In Africa the wooded land goes into in the savanna by means of arboreal species of leaves that fall in the dry station The most frequent trees are acacias and baobabs This biome is populated with antelopes zebras giraffes of more than five meters of height rhinos elephants buffalos and great savage mammals The herbaceous plants grass are typical of savanna 50 million years ago earth rain regime suffered a change In vast zones the herbaceous spread in damage of the trees The ground of the savanna does not arrive at great depth in undercoat call horizon A the ground particles is mixed with organic matter in decomposition not very abundant in the second layer or horizon B where prevails minerals GEOGRAPHIC DISTRIBUTION OF SAVANNA The animals of jungles and forests went attracted by the abundance of foods The key of the continuity of the grass and other herbaceous ones in savanna consist of its great adaptability on the one hand and by another one of the fact that they appear inclusively level with the ground and in many species underneath him This allows that the herbivorous animals feed themselves without destroying the plant that can continue growing Since grass at times of drought increase their content of cellulose and this one makes difficult the ingestion the animals of the savanna developed hard teeth and in the case of the ruminant a stomach divided in cavities to facilitate the digestion Other typical forms of life of this biome are the innumerable species of insects that appear in the season of rains Chaco plain and closed In America three different types from savannahs exist the closed ones the chaco and the plain ones The closed ones are formations that extend by the plateau of Brazil and cover almost 2 000 000 with km2 It display an ample variety of ecosystems clean fields that are zones of grass dirty fields where there are trees and shrubs closed fields that are the typical ligneous savanna and very closed where the arboreal cover occupies 50 of the land Chaco sandal almost 1 000 000 of km2 in territories of Bolivia Paraguay and Argentina It is a zone where the ligneous plants with thorns predominate The climatic conditions become progressively more droughts to the west of the rivers Paraguay and Parana The forests of the chaco happen to have a character of tropical rainforest in the call zone of humid chaco to being a zone of thin forest to which dry chaco is denominated The plain ones include almost 500 000 km2 in Venezuela and Colombia Of April to October rains make overflow the rivers and cause floods In the dry station the water evaporates and the land becomes very barren The man in the savanna In 1924 anthropologist Ragmond Dart discovered a small skull

    Original URL path: http://www.barrameda.com.ar/ecology/the-savanna.htm (2014-02-03)
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