The effect of the electrical charge on the intestinal absorption of a protein was studied in normal adult rats. Chicken egg lysozyme (Lyz), a basic protein with a molecular weight of 14,300, was selected and several techniques for chemical modification were applied. Then the intestinal absorption of Lyz derivatives was evaluated by measuring the radioactivity in plasma and tissues, after the ad...

The Jiangmen Underground Neutrino Observatory will build the world's largest liquid scintillator detector to study neutrinos from various sources. 20 kt be stored in a $\sim$600 t acrylic sphere with 35.4 m diameter due good light transparency, chemical compatibility and low radioactivity of acrylic. concentration U/Th is required less than 1 ppt (10$^{-12}$ g/g) achieve radioactive background ...

Background: Salivary flow rate (SFR), to estimate salivary gland dysfunction and radioactivity in different body fluids, to evaluate its intensity, were determined in thyroid patients after 131-I therapy. Material and Methods: For determination of SFR an innovative sponge test was adopted and the radioactivity in saliva, blood and serum of thyroid patients was determined by NaI (TI) Scintillati...

Aiming at radiopharmaceutical application, (111)In(3+) complexes of the polyaminocarboxylates TTHA, TTHA-bis(butylamide) and TTHA-bis(glucamide) were investigated. The in vitro stability of (111)In(TTHA)(3-) and (111)In(TTHA-bis(butylamide)(-) was evaluated by measuring the exchange of (111)In(3+) from the complexes to transferrin and the results were compared with those for (111)In(DTPA)(2-). ...

Since more than two years the so-called Counting Test Facility (CTF), the prototype of the BOREXINO solar neutrino experiment, is taking data at the underground laboratories of the LNGS. During its construction and the period of data taking a new method for measuring radioactivity at ultralow levels has been developed. This method is based on a well known type of detector, on miniaturized propo...

We propose a simple method to assess the number of subpopulations in multivariate data by projecting the data on its principal curve and then applying Silverman’s bandwidth test to the resulting univariate sample. Our results indicate that this method works well even in high-dimensional settings with relatively small sample sizes, provided that the number of subpopulations is not large compared...

The paper is devoted to the estimation of characteristic limits (statistical criteria) for detection small amounts ionizing radiation by a measuring device under conditions natural radioactivity background environment: decision threshold, limit, minimum detectable activity and confidence interval. assessment procedures were carried out in accordance with national harmonized standard DSTU ISO 11...

Abstract Compared with other methods for measuring radioactivity in water, liquid scintillation measurement has the outstanding advantages of fast sample pretreatment, simple method and high detection efficiency. Based on spectrometer (SIM-MAX LSA3000B), 14 C 90 Sr- Y are selected as typical nuclides to study change TDCR quenching correction curve under different activity concentrations, basic ...

1. The role of pyruvate carboxylation in the net synthesis of tricarboxylic acid-cycle intermediates during acetate metabolism was studied in isolated rat hearts perfused with [1-14C]pyruvate. 2. The incorporation of the 14C label from [1-14C]pyruvate into the tricarboxylic acid-cycle intermediates points to a carbon input from pyruvate via enzymes in addition to pyruvate dehydrogenase and citr...