A tracer test was conducted at the Dixie Valley, Nevada, geothermal reservoir using fluorescein. Four of 9 production wells showed fluorescein breakthrough during the first 200 days of the test. Reconstructed fluorescein return curves are presented that correct for the thermal decay of the tracer assuming an average reservoir temperature of 227°C. In order to examine the feasibility of using nu...

We synthesized an 1l-IabeIed-histamine-cycIosporin C tracer, to obviate the use of tntiated tracer in radloimmunoassay of cyclosporine. With this tracer, the assay results varied linearly with concentration up to at least 800 Mg/L. The within-assayCV was 6.6% at 39 p.g/L, 4.2% at 100 ig/L, and 7.0% at 300 1i.g/L(n = 15). The between-assayCV was 10.0, 6.4, and 7.8% for the same respectiveconcent...

Based on extensive Brownian dynamics simulations we study the thermal motion of a tracer bead in a cross-linked, flexible gel in the limit when the tracer particle size is comparable to or even larger than the equilibrium mesh size of the gel. The analysis of long individual trajectories of the tracer demonstrates the existence of pronounced transient anomalous diffusion. From the time averaged...

Tracer diffusion in an ordered two-dimensional lattice-gas system with square lattice symmetry is studied theoretically and by means of computer simulations. It is well known that the ordering with c 2 2 symmetry formed in the vicinity of half-filling of lattice sites is due to strong nearest neighbor repulsive interaction. In this case, the tracer migration occurs mainly by elementary displace...

We presented a 30 year-old woman presented with symmetrical swelling of the lower limbs since 5 years ago with sparing of the feet. She was highly suspicious of having lipoedema and was referred for lower limb lymphoscintigraphy to rule out possible lymphedema. Lymphoscintigraphy images showed asymmetrical injection sites and unusually high liver and spleen uptake. Inguinal nodes was not visual...

The use of isotopes makes possible quantitative measurements of many biochemical and physiological processes, hitherto secure from such detailed observation. Perhaps the most frequent use of this tool is in the observations of physiology that are concerned with the transfer of fluid from one portion of the body to another, and in the biochemical observations of the formation of one compound fro...

aflatoxins are a group of fungal toxic metabolites, which are contaminated certain food commodities. elisa is one of the sensitive methods for detection of aflatoxins. preparation and stabilizing of a proper conjugated tracer for detection of aflatoxins is probably the main step for designing an elisa method. in current study, different stabilizers were applied to stabilize a newly prepared con...