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The influence of calcium on potassium fluxes across the root of Ricinus communis.
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The effect of calcium on the flux of potassium to the exudate of detached root systems of Ricinus communis has been investigated. Previous analyses have indicated the presence of a water dependent and a water independent flux of potassium which vary with the concentration of potassium in the bathing
Water dependent and water independent fluxes of potassium in exuding root systems of Ricinus communis.
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The flux of water, [Formula: see text], to the xylem of exuding root systems of Ricinus communis was controlled using a range of mannitol concentrations permitting the influence of this water flux on the potassium flux, f K, to be studied. The relationship between [Formula: see text] and f K thus
Effect of Potassium Supply on the Rate of Phloem Sap Exudation and the Composition of Phloem Sap of Ricinus communis.
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The composition of phloem sap has been investigated in Ricinus communis var. gibsonii, grown for 2 weeks on nutrient solution of low and high potassium content (K(1) and K(2)). Diagonal cuts were made in the bark of the stem resulting in the exudation of clear droplets which mainly consisted of
Bioindicator potential of Ricinus communis to simulated rainfall containing potassium fluoride
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Background: Fluoride pollution is a global problem because of its high phytotoxicity. Fluoride is released in air, water and soil through industrial processes, where it damages various plant species. Ricinus communis is widely
Flows of elements, ions and abscisic acid in Ricinus communis and site of nitrate reduction under potassium limitation.
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In a pot experiment Ricinus communis plants were cultivated in quartz sand and supplied daily with a nutrient solution which contained 4 mol m(-3) nitrate as the nitrogen source and either full strength potassium (1.3 mol m(-3), control) or 8% potassium (0.1 mol m(-3), K(+)-limitation). Although the
Final report on the safety assessment of Ricinus Communis (Castor) Seed Oil, Hydrogenated Castor Oil, Glyceryl Ricinoleate, Glyceryl Ricinoleate SE, Ricinoleic Acid, Potassium Ricinoleate, Sodium Ricinoleate, Zinc Ricinoleate, Cetyl Ricinoleate, Ethyl Ricinoleate, Glycol Ricinoleate, Isopropyl Ricinoleate, Methyl Ricinoleate, and Octyldodecyl Ricinoleate.
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The oil derived from the seed of the Ricinus communis plant and its primary constituent, Ricinoleic Acid, along with certain of its salts and esters function primarily as skin-conditioning agents, emulsion stabilizers, and surfactants in cosmetics, although other functions are described. Ricinus
Effects of temperature and dinitrophenol on the uptake of potassium and sodium ions in Ricinus communis roots.
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Detopped root systems of Ricinus communis plants were used for the study of the effects of temperature and DNP on the uptake of K and Na ions supplied as KNO3 and NaNO3.When K and Na ions were offered together in equivalent concentrations, the steady state uptake rates for K(+) and Na(+) at 23 to
Effect of ringing on potassium uptake by Ricinus communis plants.
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Chemical, pathological and toxicological studies of the effects of RICOM-1013-J of Ricinus communis var minor on women volunteers and rodents.
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RICOM-1013-J (Ricinus communis var minor) administered orally once to each of 12 women volunteers at a dose of 2.5-2.7 g per 8 months, protected against pregnancy over a period of 7-8 months of study. A study of the effect of a contraceptive dose (20 mg/kg) on metabolic parameters in rat (food and
The chemical composition of Ricinus phloem exudate.
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The chemical composition of exudate obtained from incisions made in the bark of the stem of actively growing Ricinus plants has been determined. The exudate had a high dry matter content (100-125 mg/ml), a high sugar content (80-106 mg/ml) which was solely sucrose, reducing sugars being absent. The
Regulation of carbon partitioning between sucrose and nitrogen assimilation in cotyledons of germinating Ricinus communis L. seedlings.
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The interactions between carbon and nitrogen metabolism in cotyledons of germinating Ricinus communis L. seedlings were investigated. The endosperm was removed for 6-d-old seedlings and their cotyledons were supplied with 50 mM glucose and mM potassium phosphate without a nitrogen source, or
A mathematical analysis of water and solute transport across the root of Ricinus communis.
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A mathematical analysis of the relationship between the flux of water, f H2O, and the flux of potassium f K, to the xylem of exuding root systems of Ricinus communis, is presented. Previous analyses (Baker and Weatherley, 1969; Minchin and Baker, 1969) have indicated the presence of a water
Sucrose and proton cotransport in Ricinus cotyledons : II. H(+) efflux and associated K(+) uptake.
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In Ricinus cotyledons, evidence for proton extrusion came from observation of direct acidification of the medium in the presence of potassium salts. Increasing K(+) influx with increasing pH suggested a link between K(+) influx and H(+) efflux by an H(+) pump. The kinetics of K(+) influx and H(+)
Phloem transport of (14)C-labelled assimilates in Ricinus.
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Exudate can be obtained from incisions made in the bark of the stem of actively growing Ricinus plants. (14)C-labelled assimilates from a fed leaf are rapidly detected in the exudate. This movement was both acropetal and basipetal from the fed leaf, at rates of over 100 cm h(-1). Estimated rates
Lectins as membrane components of mitochondria from Ricinus communis.
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1. Mitochondria were isolated from developing endosperm of Ricinus communis and were fractionated into outer membrane and inner membrane. The relative purity of the two membrane fractions was determined by marker enzymes. The fractions were also examined by negative-stain electron microscopy. 2.
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