Contents move to sidebar hide Début 1 Dans les cycles biogéologiques 2 Problèmes de définition Afficher / masquer la sous-section Problèmes de définition 2.1 Définitions européennes 3 Utilisations 4 Cinétique environnementale 5 Impacts écotoxicologiques Afficher / masquer la sous-section Impacts écotoxicologiques 5.1 Impacts sur les végétaux 5.2 Tolérances des végétaux …

Taxonómicamente las algas verdes se suelen clasificar en dos divisiones (o filos): . Chlorophyta es un clado que con dependencia de los criterios de clasificación, queda enmarcado o en el reino Protista o en el reino Plantae.; Charophyta es un grupo parafilético dentro del clado Streptophyta.; De enorme variedad, viven en aguas dulces y marinas. Suelen agruparse en colonias, de …

Mývatn (Icelandic pronunciation: [ˈmiːˌvahtn̥]) is a shallow lake situated in an area of active volcanism in the north of Iceland, not far from Krafla volcano.It has a high amount of biological activity.The lake and the surrounding wetlands provides a habitat for a number of waterbirds, especially ducks.The lake was created by a large basaltic lava eruption 2300 years ago, and …

Marimo (also known as Cladophora ball, moss ball, or lake ball) is a rare growth form of Aegagropila linnaei (a species of filamentous green algae) in which the algae grow into large green balls with a velvety appearance.. The species can be found in a number of lakes and rivers in Japan and Northern Europe. Colonies of marimo balls are known to form in Japan and …

Lake Tahoe (/ ˈ t ɑː h oʊ /; Washo: Dáʔaw, meaning "the lake") is a large freshwater lake in the Sierra Nevada of the United States. Lying at 6,225 ft (1,897 m), it straddles the state line between California and Nevada, west of Carson City.Lake Tahoe is the largest alpine lake in North America, and at 122,160,280 acre⋅ft (150.7 km 3) it trails only the five Great Lakes as the …

Pałeczka okrężnicy (łac. Escherichia coli) – Gram-ujemna względnie beztlenowa bakteria należąca do rodziny Enterobacteriaceae.Wchodzi w skład fizjologicznej flory bakteryjnej jelita grubego człowieka oraz innych zwierząt stałocieplnych.W jelicie ta symbiotyczna bakteria spełnia pożyteczną rolę, uczestnicząc w rozkładzie pokarmu, a także przyczyniając się do produkcji ...

Nguyên phân ở một tế bào động vật (các giai đoạn được sắp xếp ngược chiều kim đồng hồ).. Trong sinh học tế bào, nguyên phân hay phân bào nguyên nhiễm là một phần của chu kỳ tế bào khi các NST kép được tách và đi về hai nhân tế bào mới. Nguyên phân (phân chia nhân) có tiền đề từ giai đoạn S của pha ...

A coal ball is a type of concretion, varying in shape from an imperfect sphere to a flat-lying, irregular slab.Coal balls were formed in Carboniferous Period swamps and mires, when peat was prevented from being turned into coal by the high amount of calcite surrounding the peat; the calcite caused it to be turned into stone instead. As such, despite not actually being made of …

Lake Merritt is a large tidal lagoon in the center of Oakland, California, just east of Downtown.It is surrounded by parkland and city neighborhoods. It is historically significant as the United States' first official wildlife refuge, designated in 1870, and has been listed as a National Historic Landmark since 1963, and on the National Register of Historic Places since 1966.

Alternation of generations (also known as metagenesis or heterogenesis) is the predominant type of life cycle in plants and algae.It consists of a multicellular haploid sexual phase, the gametophyte, which has a single set of chromosomes alternating with a multicellular diploid asexual phase, the sporophyte which has two sets of chromosomes.. A mature sporophyte …