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Приведены результаты исследования кинетики распределения водорода в сварном соединении в зависимости от температурных режимов.
 Introduction: Hydrogen breath test (BT) is commonly used as a diagnostic tool for the detection of small intestine bacterial overgrowth (SIBO). It was reported that colonic methane production is far more frequent in cystic fibrosis (CF) patients than in other subjects. Therefore, measuring exclusively hydrogen in the diagnostic breath test for diagnosing SIBO might be of limited value. We aimed to assess the usefulness of combined measurement of hydrogen and methane expiration for the diagnosis of SIBO in CF. Material and Methods: The study comprised 62 CF patients aged 5 to 18 years. Three-hundred-ninety subjects assessed due to gastrointestinal symptoms for the presence of SIBO served as a comparative group. In all subjects hydrogen/methane BT using glucose was performed. A positive BT was defined as fasting hydrogen ≥ 20 ppm or fasting methane ≥ 10 ppm or a rise of ≥ 12 ppm hydrogen or ≥ 6 ppm methane over baseline during the test. Results: In 23 (37.1%) CF patients and in 52 (13.3%) subjects from the comparative group abnormal BT results were found. In seven (11.3%) CF patients and 29 (7.4%) of the other subjects studied methane measurement allowed diagnosis of SIBO. Conclusions: Small intestine bacterial overgrowth is frequent in cystic fibrosis. For its detection in cystic fibrosis and other gastrointestinal patients, combined hydrogen and methane measurement instead of hydrogen breath test should be applied. Without the additional measurement of methane a significant percentage of SIBO will be missed.
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Autohydrolysis of hydrogen distarch phosphates

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The heat-induced hydrolysis and physico-chemical properties of hydrogen distarch phosphates (HDP) obtained from potato, wheat and triticale starches were studied. The HDP were found to hydrolyse, resulting in o-phosphoric acid and the breakdown of glycosidic linkages, the latter being proved by a decrease in maximum absorbance of the potato starch iodocomplex and the changes in carbohydrate composition of the potato starch hydrolysate. Compared to distarch phosphates, their hydrogen derivatives showed higher water binding capacity, water solubility and reducing capacity and lower limiting viscosity. These differences in the properties may indirectly evidence the ability of HDP to autohydrolysis.
Carbon, hydrogen and sulphur were determined in biomass (shoots and roots) of five species of shrub willow: Salix viminalis, Salix dasyclados, Salix triandra, Salix purpurea and Salix alba. Samples of the biomass collected from a strict experiment were dried to constant weight at 105oC. The content of carbon, hydrogen and sulphur was determined in an automatic determinator ELTRA CHS 500. In addition to the chemical determinations, willow plants were assessed, in the first year of cultivation, in terms of their morphological traits and yields. The results underwent statistical analysis using Excel spreadsheets and Statistica PL software programme. An average content of carbon in the biomass of the five analysed willow species was 496.33 g⋅kg-1 d.m. Among the five species, the highest carbon content was discovered in the biomass of Salix purpurea (501.32 g⋅kg-1 d.m.). An average content of hydrogen in aerial parts of shrub willow was significantly higher than in their roots (507.95 vs 465.88 kg-1⋅d.m.). The content of hydrogen in all the species of shrub willow was on average 71.11 g⋅kg-1 d.m., with the highest hydrogen amount in biomass attributed to Salix triandra (74.98 g ⋅kg-1 d.m.). This species, on the other hand, had the lowest concentration of sulphur in its biomass (on average 0.43 g⋅kg-1 d.m.). The average content of sulphur in aerial parts was significantly lower than in roots of willow plants (0.52 vs 0.95 g⋅kg-1 d.m.). This relationship held true for all the five species of willow plants. An average yield of dry biomass obtained from the five shrub willow species in the year when the experiment was established was 5.81 Mg⋅ha-1. The highest dry biomass yield was produced by Salix viminalis (7.22 Mg⋅ha-1).
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