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Microbial swimmers, sometimes called microswimmers, are microscopic entities that have the ability to move in fluid or aquatic environment. [5] Natural microswimmers are found everywhere in the natural world as biological microorganisms , such as bacteria , archaea , protists , sperm and microanimals .
In 1949, Cousteau left the French Navy. In 1950, he founded the French Oceanographic Campaigns (FOC), and leased a ship called Calypso from Thomas Loel Guinness for a symbolic one franc a year. Cousteau refitted the Calypso as a mobile laboratory for field research and as his principal vessel for diving and filming.
The cell membranes of a variety of different bacteria, fungi, animal and plant cells contain aquaporins through which water can flow more rapidly into and out of the cell than by diffusing through the phospholipid bilayer. [2] Aquaporins have six membrane-spanning alpha helical domains with both carboxylic and amino terminals on the cytoplasmic ...
Tunas such as the bluefin swim fast with their large crescent-shaped tails. The thunniform group contains high-speed long-distance swimmers, and is characteristic of tunas [5] and is also found in several lamnid sharks. [6] Here, virtually all the sideways movement is in the tail and the region connecting the main body to the tail (the peduncle).
Motile marine animals are commonly called free-swimming, [10] [11] [12] and motile non-parasitic organisms are called free-living. [13] Motility includes an organism's ability to move food through its digestive tract. There are two types of intestinal motility – peristalsis and segmentation. [14]
An image of French swimmer, Leon Marchand, decorates the Montparnasse tower ahead of the 2024 Summer Olympics, Tuesday, July 23, 2024, in Paris. (AP Photo/David Goldman) (ASSOCIATED PRESS) Making ...
The term was proposed by German biologist Ernst Haeckel to differentiate between the active swimmers in a body of water, and the planktons that were passively carried along by the current. As a guideline, nektonic organisms have a high Reynolds number (greater than 1000) and planktonic organisms a low one (less than 10).
With a boisterous crowd cheering him on, Léon Marchand began his home Olympics by cruising to the fastest time in the preliminaries of the 400-meter individual medley Sunday. The 22-year-old ...