Nitrate uptake and extracellular alkalinization by the green alga Hydrodictyon reticulatum in blue and red light
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Parallel pathways of potassium transport in the alga Hydrodictyon reticulatum. Effects of calcium.
Inflow of potassium ions into the alga Hydrodictyon reticulatum is reduced in the dark, the reduction being accompanied by a change in the selectivity pattern with respect to alkali metal ions, observed in competition experiments and evaluated by the gnostic analysis as described by Kovanic. This suggests that in the light a special mechanism of potassium uptake with a characteristic selectivit...
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The unicellular green alga, Monoraphidium braunii, reduced extracellular ferricyanide at high rates. Impermeability of the membranes to ferriand ferrocyanide was shown for untreated cells as for those permeabilized with 5% I-propanol. Fe starvation stimulated reduction rates by 50%, light or glucose were ineffective. Extracellular acidification largely corresponded to formation of the new anion...
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Long-term effects of mannitol hypertonicity on the water and ion contents in the fresh-water alga Hydrodictyon reticulatum were studied. The cells did not behave as osmometers and a closer examination suggested that wall elasticity was related to the medium tonicity and that the rate of sodium extrusion from the cells depended on the wall (turgor) pressure.
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Z. Naturforsch. 46c, 542-548 (1991); received February 13, 1991 Blue-Light Photoreceptor, Chlorophyll Synthesis, Desmarestia aculeata, Green-Light Photo receptor, Nitrate The chlorophyll synthesis in the brown algae Desmarestia aculeata is affected by light quali ty and by the nutrient state in the medium before the illumination. Pulses of 5 min of red, green and blue light together with 200 ...
متن کاملpH Changes in the Cytoplasm of the Blue-Green Alga Anacystis nidulans Caused by Light-dependent Proton Flux into the Thylakoid Space.
The pH in the cytoplasmic and thylakoid spaces of the blue-green alga, Anacystis nidulans, has been determined in the light and in the dark by uptake of 5,5-dimethyloxazolidine-2,4-dione and methylamine into the sucrose-impermeable (3)H-H(2)O space, as measured by silicon layer filtering centrifugation.Illumination causes an alkalinization in the cytoplasm which is accompanied by an acidificati...
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تاریخ انتشار 1998