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Pàgina 1 des de 22 resultats
Metabolic factors influencing the sodium and potassium distribution in Ulva lactuca.
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1. Methods for the use of the marine green alga, Ulva lactuca, in studies on electrolyte metabolism are described. 2. The effect of illumination and iodoacetate on the potassium and sodium content, as well as the influence of light and running sea water on the iodoacetate effect was investigated.
Evidence for the presence of separate mechanisms regulating potassium and sodium distribution in Ulva lactuca.
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1. The methods employed in these and preceding (25-27) studies were shown to allow analysis of true cellular sodium and potassium concentrations. 2. The rate of reaccumulation of potassium by potassium-deficient cells is independent of the presence or absence of sodium in the external medium. 3.
The influence of iodoacetate on the sodium and potassium content of Ulva lactuca and the prevention of its influence by light.
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The influence of temperature and illumination on the exchange of potassium ion in Ulva lactuca.
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Decontamination treatments to eliminate problem biota from macroalgal tank cultures of Osmundea pinnatifida, Palmaria palmata and Ulva lactuca.
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The effect of a range of chemical disinfectants at different concentration and exposure times was investigated on five macroalgal species and the marine gastropod Littorina spp. Palmaria palmata, Osmundea pinnatifida and Ulva lactuca are commercially valuable and are often cultivated in tanks for
Osmotic adaptation in Ulva lactuca under fluctuating salinity regimes.
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A study has been made of the osmotic responses of the green intertidal alga, Ulva lactuca, under two fluctuating salinity regimes; sinusoidal and square-wave fluctuations between 30 and 100% sea water in a 12 h cycle. These regimes closely resemble the tidal fluctuation of salinity encountered by
An evaluation of the toxicity and bioaccumulation of thallium in the coastal marine environment using the macroalga, Ulva lactuca.
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Thallium(I) has been added to cultures of the marine macroalga, Ulva lactuca, for a period of 48 h and the accumulation of the metal and its effects on the photochemical efficiency of photosystem II (PS II) measured. Thallium elicited a measurable toxic response above concentrations of 10 μg L⁻¹ in
Sources and fates of perchlorate in soils in Chile: A case study of perchlorate dynamics in soil-crop systems using lettuce (Lactuca sativa) fields.
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Perchlorate occurs naturally in the environment in deposits of nitrate and can be formed in the atmosphere and precipitate into soil. However, little is known about the occurrence and levels of perchlorate in soils and fertilizers in Chile and its impacts on agricultural systems and food safety. In
[The dynamic of calcium distribution during megasporegenesis of lettuce (Lactuca sativa L.)].
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Potassium antimonite was used to deposit calcium in the young ovule of lettuce (Lactuca sativa L.) at megasporogenesis stage to study the relationship between calcium and megaspore degeneration. At the megaspore mother cell stage, few calcium granules were formed in the cell (Plate I-1, 2). After
Bioavailability of silver and silver sulfide nanoparticles to lettuce (Lactuca sativa): Effect of agricultural amendments on plant uptake.
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Silver nanoparticles (AgNPs) can enter terrestrial systems as sulfidised AgNPs (Ag2S-NPs) through the application of biosolids to soil. However, the bioavailability of Ag2S-NPs in soils is unknown. The two aims of this study were to investigate (1) the bioavailability of Ag to lettuce (Lactuca
[The character of calcium distribution in developing anther of lettuce (Lactuca sativa L.)].
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Potassium antimonite was used to locate calcium in the anther of lettuce (Lactuca sativa L) during its development. At the early stage of anther development there were few calcium granules in microspore mother cells and the cells of anther wall. After meiosis of microspore mother cells, calcium
[Calcium distribution in the central cell of lettuce (Lactuca sativa L.) before and after pollination].
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Potassium antimonite precipitation was used to locate calcium in the central cell of lettuce (Lactuca sativa L.) before and after pollination. At 3d before anthesis, two polar nuclei of central cell separately located at two polarity of the cell, and few calcium precipitates (ppts) appeared in the
Interaction of [(3)H] gibberellin A 1 with a sub-cellular fraction from lettuce (Lactuca sativa L.) hypocotyls : II. Stability and properties of the association.
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Radioactive 2,000 g pellets (2KP) derived from lettuce (Lactuca sativa) hypocotyl sections incubated with [(3)H]gibberellin A1 ([(3)H]GA1) were subjected to a range of treatments to test the stability of labelling. The labelled association was stable in 0.1 M buffer at pH 3 and pH 9 and also in 1 M
[Studies on the calcium distribution in developing synergids of lettuce (Lactuca sativa L.)].
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Potassium antimonite was used to locate calcium in the synergids of lettuce (Lactuca sativa L) during their development. The two synergids on 3d before anthesis formed evident polarity with most cytoplasm located in the micropylar end and nucleus in the middle and a big vacuole in the chalazal end.
[The dynamics of calcium distribution in stigma and style of lettuce (Lactuca sativa L.) before and after pollination].
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Potassium antimonite was used to deposit calcium in the stigma and style of lettuce (Lactuca sativa L.) before and after pollination. The stigma of lettuce is two splits. Abundant calcium granules are displayed in the wall of papillae on the receptive surface of stigma before and after pollination,
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