Kidneys flush-stored with M C were compared with those in U W for 2 4 h and 48 h. At both 24 h and 48 h of storage, UW-stored organs produced si nificantly more glucose than those in MC. T h e uptake of "!I-PAH did not differ significantly between the two solutions. U W was subsequently modified, replacing raffinose with mannitol (solution A), lactobionate with citric acid (solution B), and sod...

The efficacy for phytoremediation of five willow species was tested by experimental copper and cadmium uptake in a greenhouse hydroponic system. Five treatments included two concentrations (5 and 25 microM for each metal) and a control. Metal concentrations in solution as well as solution uptake were monitored. Metal resistance was assessed through effects on the dry weight of roots and shoots....

Strontium adsorption was studied in an aluminum-pillared montmorillonite (PILC) carrying organic acid groups. The in situ dissociation of these groups increases the number of negative sites in the modified PILC, promoting thus the uptake of cations from an exchange solution. To investigate the role of solution pH and acid strength in cation uptake phenomena, base titrations were performed for P...

In the present work, the usefulness of dried activated sludge has been investigated for the removal of copper ions from aqueous solutions. Kinetic data and equilibrium sorption isotherms were measured in batch conditions. The influence of initial pH, metal concentration and copper salt nature on the metal removal kinetics has been studied. Copper uptake was time contact, initial copper concentr...

To prepare membrane vesicles, nerve terminal preparations (synaptosomes) isolated from rat cerebral cortex were first subjected to hypotonic lysis. After collecting the membranes contained in this fraction by centrifugation, membrane vesicles were then reconstituted during incubation in a potassium salt solution at 37°C. The transport of glutamate, aspartate, or y-aminobutyrie acid (GABA) was m...

Zinc accumulation by Chlorella kesslerii (Chlorophycee) was studied for [Zn2+] ranging from 4 pM to 1 mM. A first-order uptake flux as predicted by the free ion activity model (FIAM) and the biotic ligand model (BLM) was not observed. Furthermore, when algae were preconditioned in slightly limiting (10 pM) versus optimal (1 nM) free zinc concentrations, the internalization flux increased and wa...

The vase life of cut flowers and foliage is often shortened by vascular occlusions that constrict vase solution supply. Reduction in stem conductivity is typically caused by blockage of cut stem ends and xylem conduits by microbes, physiological plugging, and disruption of water columns in xylem vessels by cavitations and air emboli. Cut flower and foliage longevity can be greatly affected by t...

In mammals, copper (Cu) absorption occurs mostly in the small intestine, and some of the Cu transporters involved in its uptake have been characterised. In fish, however, the regions of the gut involved in Cu absorption and the membrane transport mechanisms responsible for gastrointestinal Cu uptake are unknown. Everted gut sacs and isolated perfused intestine of Clarias gariepinus were used to...

The rate of phloem loading, its selectivity, and the disposition of labeled carbon were studied following application of (14)C-labeled sugars to the free space of source leaves of sugar beet (Beta vulgaris L.). Buffered 10 mm solutions of (14)C-labeled sucrose, fructose, stachyose, mannitol, 3-0-methyl glucose or l-glucose were applied to the abraded epidermis of source leaves held in the dark....