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Akinetes usually develop in strings with each cell differentiating after another and this occurs next to heterocysts if they are present. [1] Development usually occurs during stationary phase and is triggered by unfavorable conditions such as insufficient light or nutrients, temperature, and saline levels in the environment.
Their cell size varies from less than 1 μm in diameter (picocyanobacteria) up to 100 μm (some tropical forms in the genus Oscillatoria) [39] [40] [41] Filamentous forms exhibit functional cell differentiation such as heterocysts (for nitrogen fixation), akinetes (resting stage cells), and hormogonia (reproductive, motile filaments). These ...
As these cells grow, they uptake nutrients like P. However, they generally uptake more nutrients than they need and store it for later use for when they migrate to the nutrient deplete epilimnion. [ 7 ] [ 8 ] [ 3 ] The minimum cellular need for P in Gloeotrichia is approximately 2.3 g P/mg C, but actual uptake is 25-500e-6 g/L/day, compared to ...
Some cells within clonal filaments differentiate into heterocysts (large, round cell, right). Heterocysts abandon oxygen-producing photosynthesis in order to fix nitrogen with the oxygen-sensitive enzyme nitrogenase. Vegetative and heterocyst cells divide labor by exchanging sugars and nitrogen.
The classic taxonomic criterion has been the cell morphology and the plane of cell division. In Pleurocapsales, the cells have the ability to form internal spores (baeocytes). The rest of the sections include filamentous species. In Oscillatoriales, the cells are uniseriately arranged and do not form specialized cells (akinetes and heterocysts ...
Stomach cancer mostly affects older people, but aside from age, risk factors include being overweight or obese; eating a diet high in salted foods and grilled or processed meats with few or no ...
Stiller said he wants to shield the actors from seeing cell phones on set because performing in front of the camera is “such a vulnerable thing.” “As a director, you want to protect that ...
Activity is initiated by the pacemaker cells (interstitial cells of Cajal). The gut has intrinsic peristaltic activity ( basal electrical rhythm ) due to its self-contained enteric nervous system. The rate can, of course, be modulated by the rest of the autonomic nervous system .