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Elodea is a genus of eight species of aquatic plants often called the waterweeds described as a genus in 1803. Classified in the frog's-bit family ( Hydrocharitaceae ), Elodea is native to the Americas [ 1 ] and is also widely used as aquarium vegetation and laboratory demonstrations of cellular activities.
Elodea bifoliata is an perennial aquatic plant that roots in the bottoms of freshwater streams and lakes. [3] It has small flat leaves just 4.7–24.8 millimeters long. [4] They are narrow and grass like or only slightly elliptic, 0.8–2.5 mm in width. There are usually just two leaves at each stem node, though there may be two or three per ...
Elodea densa flower. Elodea densa is an aquatic plant growing in water up to 4 m (13 ft) deep, with trailing stems to 2 m (6.6 ft) or more long, producing roots at intervals along the stem. The leaves are produced in whorls of four to eight, 1–4 cm (0.39–1.57 in) long and 2–5 mm (0.079–0.197 in) broad, with a pointed leaf tip.
Elodea canadensis (American waterweed or Canadian waterweed or pondweed) is a perennial aquatic plant, or submergent macrophyte, native to most of North America. [ 3 ] [ 4 ] [ 5 ] It has been introduced widely to regions outside its native range and was first recorded from the British Isles in about 1836.
The area provides a reference unit, for example in reference ranges for urine tests. [3]Used for grading of soft tissue tumors: Grading, usually on a scale of I to III, is based on the degree of differentiation, the average number of mitoses per high-power field, cellularity, pleomorphism, and an estimate of the extent of necrosis (presumably a reflection of rate of growth).
Leaf shape has been found to be highly plastic, with variability due to changes in light, water chemistry, planting depth, sediment conditions, temperature, photo period, waves, and seasonality. [4] All Potamogeton have a delicate membranous sheathing scale, the stipule, at the leaf axil. This may be wholly attached, partly attached, or free of ...
A type of bacteria dubbed “Conan the Bacterium” can withstand radiation thousands of times stronger than what can kill a human. Now, scientists have figured out why.
Elodea nuttallii is a species of waterweed known by the common name western waterweed or Nuttall's waterweed. [3] This is a perennial aquatic plant which is native to North America where it grows submersed in lakes, rivers, and other shallow water bodies.