نتایج جستجو برای: radioactive isotope
تعداد نتایج: 52673 فیلتر نتایج به سال:
Plasma catecholamines were fluorometrically determined by a modification of the standard alumina-trihydroxyindole method in which radioactive tracer catecholamines are used to follow the chromatographic behavior of the endogenous catecholamines on alumina. This modification permits appropriate fluorometry of that portion of the eluate with the highest concentration of catecholamines, because in...
A continuous and real-time fluorometric assay for monoamine-preferring phenol sulfotransferase (SULT1A3) was developed. The methodology was based on the coupling of SULT1A1 to regenerate 3'-phosphoadenosine-5'-phosphosulfate (PAPS) using 4-methylumbelliferyl sulfate (MUS) as a sulfuryl group donor. The fluorophore product (4-methylumbelliferone, MU) was continuously produced and monitored when ...
The angular distribution of − particles emitted by the radioactive isotope Fe was monitored following implantation into Si single crystals at fluences from 1.4 1012 cm−2 to 1 1014 cm−2. We identified Fe on three distinct sites: ideal substitutional, displaced substitutional and displaced tetrahedral interstitial. Whereas displaced substitutional Fe was dominating for annealing temperatures belo...
In a combined radioactive isotope study, Nae, Ke, bromine space and total body water were measured in a group of fourteen hypothyroid subjects. These were compared with a 'control' group. Total body water and Nae were found to be increased in the hypothyroid subjects. In seven subjects, the measurements were repeated after treatment with thyroid hormone. Most of the subjects lost weight and sho...
This paper reviews the current literature concerning the different investigative modalities available to assess the microcirculation in diabetic microangiopathy. The advantages and disadvantages of the different invasive and noninvasive methods available are presented objectively. We have concentrated on the tests that provide a quantitative assessment of the microcirculation, including laser D...
The present study describes a colony hybridization setup for identification of enterotoxigenic Escherichia coli obviating the need for advanced equipment and radioactive isotopes. With a modest laboratory arrangement, polynucleotide gene probes were produced in large quantities. The probes were labeled with digoxigenin and, after hybridization, detected with an antidigoxigenin alkaline phosphat...
highly radioactive byproducts. Commercially, uranium is used in an enriched form (higher percentage of the fissile isotope U) and a depleted form (low percentage of U). Enriched uranium is used in nuclear reactors, while depleted uranium is used for military applications in munitions and armor. Uranium has low gastrointestinal absorption; absorbed uranium takes the form of uranyl ion for circul...
In recent years , tritium (the radioactive isotope of hydrogen) has been increasingly used as a r e search tool in chemistry, physics, biology, meteorology and hydrology. In a variety of investigations, such as the study of biological and metabolic processes, tritium or a chemical compound with tritium as one of the constituents can be used as a tracer. It is also useful in studying the effects...
We have studied the lattice sites of Er in CZ Si single crystals by using conversion electron emission channeling from the isotope Er (2.28 s) which is the decay product of radioactive Tm (9.25 d). Following 60 keV implantation of Tm at a dose of 4×10 cm and annealing at 600°C, more than 90% of Er is found close to tetrahedral insterstitial (T) sites. The tetrahedral fraction of Er decreases co...
We report on the first successful extraction of a β+ Gamow-Teller strength distribution from a radioactive isotope in an intermediate-energy charge-exchange experiment in inverse kinematics. The (7Li,7Be+γ(429 keV)) reaction at 100A MeV was used to measure Gamow-Teller transition strengths from 34P to states in 34Si. The results show that little mixing occurs between sd and pf shell configura...
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