1190 résultats pour "planté"

• Tennessee (state) - USA History.

  The climate of Tennessee is characterized by hot summers, mild winters, and abundant rainfall. C1 Temperature Average July temperatures range from less than 21° C (70° F) in the Blue Ridge region to 27° C (80° F) at Nashville and Memphis. Maximum daytime temperatures insummer often rise above 35° C (95° F) in central and western Tennessee. Daytime temperatures in the mountains rarely rise above 32° C (90° F). Summer nights tendto be warm and muggy in central and western Tennessee, but temperatu...

• Metabolism (chemistry) - biology.

  nearly perfect balance. Although much remains to be revealed about metabolic processes, biochemists now agree that regulatory, or rate-limiting, enzymes figure largely in the reactionsinvolved ( see Enzyme). Affecting metabolic pathways at the earliest steps, each enzyme molecule has a specific, or active, site that matches, or “fits,” its particular substrate—the compound with which the enzyme forms a product. The precision with which rate-limiting enzymes and substrates join to set off a parti...

• Metabolismo - ciencias de la naturaleza.

  Tanto los sistemas mecánicos como los orgánicos desprenden también grandes cantidades de energía calorífica y proporciones pequeñas de energía útil. El músculo animalrinde casi una caloría útil por cada cuatro desprendidas en forma de calor. Pero, en los organismos animales el calor no se desperdicia por completo, pues es muy necesario—sobre todo en los animales de sangre caliente— para conservar la temperatura del cuerpo y para inducir las reacciones metabólicas, que a temperaturas más bajas se...

• United Kingdom - country.

  B Natural Regions and Topography The island of Great Britain can be divided into two major natural regions—the highland zone and the lowland zone. The highland zone is an area of high hills andmountains in the north and west. The lowland zone in the south and east consists mostly of rolling plains. The zones are divided by an imaginary line running throughEngland from the River Exe on the southwest coast to the mouth of the River Tees on the northeast coast. The lowland zone has a milder climat...

• South Dakota - geography.

  C1 Temperatures Average January temperatures are everywhere less than -4° C (24° F) and decrease to less than -12° C (10° F) in some northern sections. The January temperaturesin Sioux Falls range from -16° to -4° C (3° to 24° F). Nightime lows of -29° C (-20° F) occur during most winters. July averages are in the low and middle 20°s C (lowand middle 70°s F) throughout most of the state, and are somewhat lower in the Black Hills. The average temperature range in Sioux Falls in July is 17° to 30...

• South Dakota - USA History.

  C1 Temperatures Average January temperatures are everywhere less than -4° C (24° F) and decrease to less than -12° C (10° F) in some northern sections. The January temperaturesin Sioux Falls range from -16° to -4° C (3° to 24° F). Nightime lows of -29° C (-20° F) occur during most winters. July averages are in the low and middle 20°s C (lowand middle 70°s F) throughout most of the state, and are somewhat lower in the Black Hills. The average temperature range in Sioux Falls in July is 17° to 30...

• Sweden - country.

  mi) and is Sweden’s second largest lake, after Vänern. The two lakes, together with several smaller lakes, rivers, and canals, form an internal water route called theGöta Canal. Built in the early 19th century, the Göta Canal extends for about 386 km (about 240 mi) and provides a scenic transportation link between the Baltic Sea,at Stockholm, and the Kattegat. Sweden’s other large lakes in the district include Mälaren, Hjälmaren, and the famously picturesque Siljan. D Climate Although one-seven...

• Colorado - geography.

  Although the rivers of Colorado are navigable only by small boats, they are important as a source of irrigation water for use in Colorado and adjoining states. However,the water level of the rivers fluctuates seasonally and from year to year. The level is generally low in winter and high in spring and summer, during the runoff of meltedsnow from the mountains. Colorado has no large lakes of natural origin, but there are numerous small lakes in the mountains. The largest bodies of water in Colora...

• Colorado - USA History.

  Although the rivers of Colorado are navigable only by small boats, they are important as a source of irrigation water for use in Colorado and adjoining states. However,the water level of the rivers fluctuates seasonally and from year to year. The level is generally low in winter and high in spring and summer, during the runoff of meltedsnow from the mountains. Colorado has no large lakes of natural origin, but there are numerous small lakes in the mountains. The largest bodies of water in Colora...

• Ontario - Geography.

  governed Ontario’s initial settlement and development. The province’s most important river is the St. Lawrence. Its route was much improved and enlarged by dredgingand canal building in the mid-20th century. This enabled large ocean-going vessels to reach Great Lake ports ( see St. Lawrence Seaway). The Ottawa River was an important early route to the interior for fur traders and timber merchants. The Niagara River, because of its falls, is a great center of hydroelectric power as well as aninte...

• Ontario - Canadian History.

  governed Ontario’s initial settlement and development. The province’s most important river is the St. Lawrence. Its route was much improved and enlarged by dredgingand canal building in the mid-20th century. This enabled large ocean-going vessels to reach Great Lake ports ( see St. Lawrence Seaway). The Ottawa River was an important early route to the interior for fur traders and timber merchants. The Niagara River, because of its falls, is a great center of hydroelectric power as well as aninte...

• Bear - biology.

  programs sponsored by zoos or other breeding centers have attempted to breed giant pandas in captivity, although most of these programs have proved unsuccessful.Among the difficulties faced by captive breeders has been the problem of encouraging a female giant panda to mate with a selected male during the two to three daysof the year when she is most fertile, a period known as estrus. B Spectacled Bear Creamy-white rings surrounding the eyes give the spectacled bear its name. Its shaggy coat of...

• Reproducción - ciencias de la naturaleza.

  distintas. La mayoría de los animales y plantas pluricelulares tienen una forma de reproducción sexual más compleja en la que se diferencian de forma específica las célulasreproductoras o gametos masculino y femenino. Ambas se unen para formar una única célula conocida como cigoto, que sufrirá divisiones sucesivas y originará unorganismo nuevo. Para definir la unión de los gametos masculino y femenino se utiliza el término fecundación. En esta forma de reproducción sexual, la mitad de los genesd...

• Native American Architecture I INTRODUCTION Native American Architecture, traditional architecture of the peoples of who lived in North America before Europeans arrived.

  Mound Builders who resided in the area.John Elk III/Bruce Coleman, Inc. Another mound building culture, named Hopewell, also appears to have originated in Ohio but expanded west to Iowa, Kansas, and Oklahoma, south to Louisiana,Mississippi, and Alabama, east to Georgia and the Appalachian Mountains, and north to Wisconsin, Michigan, and lower Ontario in Canada. The Hopewell culture lastedfrom about 200 BC to 400 AD. Hopewell people built large, linear mounds to create enclosures in geometrical...

• les formes de l'argumentation

  comme les produits chimiques le sont, en effet, ils peuvent contribuer à la pollution de l'eau souterraine, ou entraîner des insuffisances en éléments nutritifs et la toxicité des sols. Beaucoup d'engrais contiennent des niveaux élevés de sel, ce qui peut provoquer "brûler" des plantes Ne jamais mettre les engrais organiques en contact avec les racines pour éviter les brûlures.   Les engrais minéraux : Les engrais minéraux sont d'origine minérale destinées à favoriser la croissance des plant...

• Massachusetts - geography.

  mi). Other large artificial lakes include Wachusett Reservoir, East Brimfield Reservoir, and Cobble Mountain Reservoir. Assawompsett Pond, covering about 10 sq km(about 4 sq mi), is the largest natural lake. North Watuppa Pond and Long Pond are other large natural lakes. Lake Chaubunagungamaug, near Webster, is usuallycalled Webster Lake, because the Algonquian name is difficult to pronounce and spell. The full version of the Native American name is said to be the longest place-namein North Amer...

• Cuba - country.

  Only two land mammals, the hutia, or cane rat, and the solenodon, a rare insectivore that resembles a rat, are known to be indigenous. The island has numerous batsand nearly 300 kinds of birds, including vultures, wild turkeys, quail, finches, gulls, macaws, parakeets, and hummingbirds. The bee hummingbird of Cuba is thesmallest bird in the world. Among the few reptiles are tortoises, caimans, the Cuban crocodile, and a species of boa that can attain a length of 3.7 m (12 ft). More than700 speci...

• Federal Republic of Germany - country.

  B Rivers and Lakes Rivers have played a major role in Germany’s economic development. The Rhine River flows in a northwesterly direction from Switzerland through much of westernGermany and The Netherlands into the North Sea. It is a major European waterway and a pillar of commerce and trade. Its primary German tributaries include theMain, Mosel, Neckar, and Ruhr rivers. The Oder (Odra) River, along the border between Poland and Germany, runs northward and empties into the Baltic; it provides an...

• Los microorganismos - (exposé gratuit en espagnol).

  ¿SON ÚTILES LOS MICROORGANISMOS? Muchas bacterias, protistas y hongos microscópicos resultan extraordinariamente útiles. Numerosos microorganismos viven en los suelos: un puñado de tierra fértil puede contener tres millones de microorganismos.Descomponiendo la materia orgánica, permiten un reciclaje de los elementos minerales, indispensables para la vida. En el medio acuático, las algas unicelulares, cuya masa total es superior a la de las plantas terrestres, producen una gran parte deloxígeno d...

• Saskatchewan (province) - Geography.

  The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...

• Saskatchewan (province) - Canadian History.

  The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...

• Native American Architecture.

  B Relationship to the Universe and Nature A more profound difference between European American and Native American perceptions lay in how human beings saw themselves in relationship to the universe andin what they believed their responsibilities were to the natural world and to each other. Most European Americans saw themselves as separate from creation andadversaries of nature, ever struggling to conquer and subdue nature and force it to yield to their will. Native Americans saw themselves as...

• Louisiana - geography.

  lakes are on the Red River and its tributaries. In addition, small oxbow lakes are numerous in the Mississippi Alluvial Plain. Oxbow lakes are formed when a river cutsthrough the neck of one of its loops, or meanders, thus establishing a shorter course and leaving the former loop as a lake separate from the river. Louisiana also hassome artificially created reservoirs. C Coastline Louisiana’s long and irregular coastline extends along the Gulf of Mexico from the Pearl River on the east to the S...

• Louisiana - USA History.

  lakes are on the Red River and its tributaries. In addition, small oxbow lakes are numerous in the Mississippi Alluvial Plain. Oxbow lakes are formed when a river cutsthrough the neck of one of its loops, or meanders, thus establishing a shorter course and leaving the former loop as a lake separate from the river. Louisiana also hassome artificially created reservoirs. C Coastline Louisiana’s long and irregular coastline extends along the Gulf of Mexico from the Pearl River on the east to the S...

• tige. n.f., axe d'une plante vasculaire portant des feuilles et

• Étudier la reproduction asexuée d'une plante 2 Découvrir Se multiplier encore et encore !

• Définition: AVOINE, substantif féminin.

  Avoine nue ou avoine ? gruau, avoine de Tartarie. Avoine annuelle ? panicule pyramidale ?tal?e en tous sens, cultiv?e pour ses grains qui se d?tachent facilement de la balle au battage (confer en particulier Dictionnaire universel de la langue fran?aise (LOUIS-NICOLAS BESCHERELLE) 1845 et DICTIONNAIRE ENCYCLOP?DIQUE QUILLET 1965). Avoine st?rile, folle avoine ou av?neron, avron. Avoine annuelle, sauvage, ? panicule ?tal?e, ?pillets de deux ou trois fleurs, avec barbes tr?s longues et glumelle in...

• gui. n.m. (Viscum album), plante parasite chlorophyllienne de la famille

• Définition du terme: CORNE, substantif féminin.

  ? Locution figur?e. Prendre le taureau par les cornes. Agir en s'attaquant de front ? ce que l'on a ? faire, ? des difficult?s que l'on doit surmonter, etc. Attaquer l'ennemi l? o? il serait le plus dur, (...) prendre le taureau par les cornes (CHARLES DE GAULLE, M?moires de guerre, 1956, page 257 ). ? Vieux. Pouvoir baiser une ch?vre entre les deux cornes. Se dit d'une personne tr?s maigre. Montrer le bout de sa corne. Se laisser entrevoir. Synonyme?: montrer le bout du nez. Montrer les c...

• Guède : couleur bleue employée en peinture et teinturerie, extraite d'une plante appelée guède ou pastel.

• bryophytes.

  nombreux rameaux s'isolent les uns des autres et poussent côte à côte, formant des coussins plus ou moins lâches qui s'accroissent progressivement. Certaines espèces émettent des fragments appelés propagules et constitués de quelques cellules ; ils sont dispersés par la pluie, par le vent ou par les frottements. Les bryophytes sont remarquables par leur capacité à se déshydrater et à reprendre vie après de longs mois de mort apparente. Les mousses vivent sur le sol, les troncs d'arbres...

• Air Pollution.

  Several pollutants attack the ozone layer. Chief among them is the class of chemicals known as chlorofluorocarbons (CFCs), formerly used as refrigerants (notably in airconditioners), as agents in several manufacturing processes, and as propellants in spray cans. CFC molecules are virtually indestructible until they reach thestratosphere. Here, intense ultraviolet radiation breaks the CFC molecules apart, releasing the chlorine atoms they contain. These chlorine atoms begin reacting withozone, br...

• France - country.

  In both the Paris and Aquitaine basins, fertile soils derived from limestone and wind-deposited dust, called loess, have supported prosperous agriculture since ancienttimes. Other lowlands in France are scattered and relatively small. They include the Alsace Plain in the east, bordering Germany, the valley of the Rhône River in thesoutheast, and the Languedoc Plain along the Mediterranean coast. A2 Uplands France contains several regions of uplands, the worn down remains of ancient mountain sys...

• Flor - ciencias de la naturaleza.

  Polinización y fecundaciónLas flores contienen las estructuras necesarias para la reproducción sexual. La parte masculina es el estambre, formado por elfilamento y la antera. La parte femenina, el carpelo, incluye el estigma, que recoge el polen; el ovario que contiene el óvulo; y elestilo, un tubo que conecta el estigma con el ovario (A). El polen es producido en la antera (B) y cuando está maduro es liberado (C).Cada grano de polen contiene dos gametos masculinos. Cuando tiene lugar la autopol...

• écologie (faune & Flore).

  4.2 Écologie des populations Le deuxième niveau d'étude est celui des populations, notion fondamentale de l’écologie, définie comme une communauté d’individus de la même espèce vivant dans lamême aire géographique. On associe aujourd'hui la génétique et l'écologie des populations dans une discipline particulière, la biologie des populations 4.3 Écosystèmes Le troisième niveau d'étude est celui des écosystèmes. Dans un lieu déterminé cohabitent des populations animales et végétales qui établiss...

• écologie (Biologie et Anatomie).

  4.2 Écologie des populations Le deuxième niveau d'étude est celui des populations, notion fondamentale de l’écologie, définie comme une communauté d’individus de la même espèce vivant dans lamême aire géographique. On associe aujourd'hui la génétique et l'écologie des populations dans une discipline particulière, la biologie des populations 4.3 Écosystèmes Le troisième niveau d'étude est celui des écosystèmes. Dans un lieu déterminé cohabitent des populations animales et végétales qui établiss...

• Algas - ciencias de la naturaleza.

  Con excepción de las cianobacterias, que también han recibido el nombre de algas verdeazuladas, las algas están formadas por células eucariotas —es decir el interior de lacélula está organizado en orgánulos separados por una membrana, entre los que se encuentran el núcleo y las mitocondrias. Las cianobacterias son organismos procariotas,es decir organismos unicelulares bastante simples que carecen de núcleo. Sin embargo, como su actual nombre indica, las cianobacterias tienen características sim...

• caféine caféine, alcaloïde (C8H10O2N4) que l'on trouve dans le café, le thé, le cacao et d'autres plantes.

• Définition du mot: ASPERGE, substantif féminin.

  Remarque?: On rencontre dans la plupart des dictionnaires g?n?raux du XIXe. et du XXe. si?cle le terme aspergerie ou aspergi?re ou aspergeraie, substantif f?minin (confer notamment Grand dictionnaire universel du XIXe. si?cle (Pierre Larousse), Nouveau Larousse illustr?, au mot aspergerie, Grand Larousse encyclop?dique en dix volumes et Dictionnaire encyclop?dique Quillet 1965; suffixe -erie*, -i?re*, -e(r)aie*). Terrain plant? d'asperges. ? Par analogie. 1. [Avec la couleur de la plante]...

• 179008 Si tu obéis à la voix de l'Éternel, ton Dieu, en observant et en mettant en pratique tous ses commandements que je te prescris aujourd'hui, l'Éternel, ton Dieu, te donnera la supériorité sur toutes les nations de la terre.

  179008 pierre. Et tu seras un sujet d'étonnement, de sarcasme et de raillerie, parmitous les peuples chez qui l'Éternel te mènera. Tu transporteras sur ton champbeaucoup de semence; et tu feras une faible récolte, car les sauterelles ladévoreront. Tu planteras des vignes et tu les cultiveras; et tu ne boiras pasde vin et tu ne feras pas de récolte, car les vers la mangeront. Tu auras desoliviers dans toute l'étendue de ton pays; et tu ne t'oindras pas d'huile, cartes olives tomberont. Tu engendr...

• exposé svt

  Il y a plus de 10 000 ans, les hommes ont sélectionné certaines espèces et cultivé celles qui leur garantissaient productivité, conservation, et qualité gustative. Cette sélection a notamment abouti à la différence, entre 6 000 et 5 000 ans avant J-C, du blé dur (pour la fabrication des pâtes) et du blé tendre (destiné au pain). C’est en 1676 que le rôle des organes sexuels chez les végétaux est découvert par Millington-Grew. A la fin du 19e...

• Bois, Haies et Pâturages

  Bois, Haies et Pâturages ment, tout comme les hommes qui apprécient notamment les baies. Celles-ci, extrêmement riches en vitamines et en oligo-éléments, perdent beaucoup de leurs qualités nutritives lorsqu'elles sont cultivées dans les jardins: d'où l'intérêt de les cueillir en milieu sauvage. Toutefois, la cueillette peut se révéler délicate car nombreuses sont les baies qui poussent sur des ronces, ces plantes grimpantes et épineuses qui envahissent les haies. La variété d...

• L’INFLUENCE DES SELS MINERAUX SUR LA CROISSANCE DE LA PLANTE VERTE

  EXPOSE DE SVT THEME L’INFLUENCE DES SELS MINERAUX SUR LA CROISSANCE DE SOMMAIRE INTRODUCTION.................................................................................2 I. LES SELS MINERAUX..................................................................3 1. Définition................................................................................3 2. Liste des sels minéraux.............................................................3 3. Les rôles des sels minéraux.....

• Prokaryote - biology.

  earliest organisms to evolve, an estimated 3.4 billion to 3.5 billion years ago. The environment of the early Earth lacked oxygen, and cyanobacteria probably usedfermentation (a chemical process performed without the presence of oxygen) to produce the energy molecule adenosine triphosphate (ATP). Cyanobacteria introduced oxygen into the atmosphere through the process of photosynthesis. As the oxygen content in the atmosphere increased over the centuries, bacteria evolved that usedthis oxygen in...

• Bois, Haies et Pâturages

  9 10 11 LA CIRCULATION DU VENT A TRAVERS LES HAIES Bois, Haies et Pâturages ment, tout comme les hommes qui apprécient notamment les baies. Celles-ci, extrêmement riches en vitamines et en oligo-éléments, perdent beaucoup de leurs qualités nutritives lorsqu'elles sont cultivées dans les jardins: d'où l'intérêt de les cueillir en milieu sauvage. Toutefois, la cueillette peut se révéler délicate car nombreuses sont les baies qui poussent sur des ronces, ces plantes...

• Les serres, les couches et leurs cultures

  Types de serre En fonction de l'emplacement des serres, on en distingue trois types différents: - la serre indépendante ou isolée , qui se révèle la meilleure pour tous les usag es ; - la serre adossée , que l'on construit en se servant d ' un mur de maison; - la serre dite «tr ois-quart », également construite en se servant d'un mur , mais qui diffère quelque peu de la précéden te en ce qui concerne la toiture. Si l' on prend...

• MAGNOL, Pierre (1638-1715) Médecin et botaniste, il conçoit l'idée du classement des plantes par familles.

• Sudan - country.

  B Principal Cities and Political Divisions The principal city is Khartoum, the capital; other major cities include Omdurman and Khartoum North, major industrial centers, and Port Sudan, a seaport on the RedSea. Sudan is divided into 26 states. C Religion and Language About 70 percent of the people of Sudan are Muslims, some 15 percent are Christians, and most of the remainder follow traditional religions. The people of northernSudan are predominantly Sunni Muslims (Sunni Islam). Most of the pe...

• Costa Rica - country.

  protection from future deforestation is not guaranteed. Deforestation places Costa Rica’s rich biodiversity in danger. The country’s location on the cusp between Northand South America and its abundance of tropical forests make it home to a great variety of species, many of them rare and threatened. Deforestation also contributesto the country’s problematic rate of soil erosion. Costa Rica is party to international treaties concerning biodiversity, climate change ( see Global Warming), endangere...

• Saudi Arabia - country.

  C Natural Resources Some of the world’s largest oil and natural gas fields lie beneath Saudi Arabia and its offshore waters, representing the country’s most economically important naturalresource. In 2007 Saudi Arabia’s oil reserves were estimated at 264 billion barrels. Before the discovery and exploitation of these reserves in the mid-20th century,Saudi Arabia was one of the poorest countries in the world. Its relatively small population subsisted in a harsh environment with little agricultur...