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361.
Věra Dosedělová Pavol Ďurč Jiří Dolina Štefan Konečný František Foret Petr Kubáň 《Electrophoresis》2020,41(1-2):116-122
Bicarbonate and phosphate constitute major salivary buffering components, and their importance consists in the neutralization of acidic gastric contents during reflux episodes. In this work, capillary electrophoresis with capacitively coupled contactless conductivity detector was applied for the analysis of bicarbonate, phosphate, and another inorganic (chloride, nitrite, nitrate, sulfate, thiocyanate) and organic anions (acetate, butyrate) to evaluate their levels in saliva. The background electrolytes of different composition and pH between 6.02–9.41 were assessed for the bicarbonate and phosphate determination by comparison of the real analyses of a model solution with the simulation by PeakMaster software. The optimized background electrolyte was composed of 10 mM 2-(N-morpholino)ethanesulfonic acid, 20 mM arginine, and 30 µM cetyltrimethylammonium bromide, pH 8.95. Using this BGE, the anion levels were compared in saliva from 20 patients suffering from gastroesophageal reflux disease (GERD) and saliva from 12 healthy subjects. Bicarbonate levels were significantly elevated in saliva from GERD patients suggesting the possible applicability of bicarbonate as a biomarker in non-invasive diagnostics of GERD by CE-C4D. 相似文献
362.
Dr. Peng Xu Dr. Jana Korcová Dr. Peter Baráth Dr. Alžbeta Čížová Dr. Jana Valáriková Prof. Dr. Firdausi Qadri Meagan Kelly Dr. Robert D. O'Connor Prof. Edward T. Ryan Dr. Slavomír Bystrický Dr. Pavol Kováč 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(56):12946-12956
The lipopolysaccharide (LPS) of Vibrio cholerae O139, strain CIRS245, was isolated conventionally, and the lipid A was removed by mild acid hydrolysis (0.1 m NaOAc buffer containing 1 % SDS, pH 4.2, 95 °C, 8 h). The crude product was a complex mixture consisting mainly of constituent fragments of the O-specific polysaccharide-core (OSPc). The OSPc was only a minor component in the mixture. Two-stage purification of the crude OSPc by HPLC gave pure OSPc fragment of the LPS, as shown by NMR spectroscopy, analytical HPLC and ESI-MS. This material is the purest OSPc fragment of the LPS from Vibrio cholerae O139 reported to date. The purified OSPc was readily converted to the corresponding methyl squarate derivative and the latter was conjugated to BSA. The conjugate, when examined by ELISA, showed immunoreactivity with sera from patients in Bangladesh recovering from cholera caused by V. cholerae O139, but not O1. 相似文献
363.
The Monte Carlo method was used for generation of amorphous polyethylene configurations on a diamond lattice. Chain building was performed on the tetrahedral lattice of edges 36, 62 and 43 Å with periodic boundary conditions imposed.32 chains were generated, each with a length of 100 CH2-groups (resulting density = 0.81 g·cm−3). Small spherical volumes with a radius of 10 Å were chosen at random from the total volume for the calculation of rotational barriers. The rotating bond was chosen to be close to the center of this sphere. We employed the method of molecular mechanics in order to calculate the rotational barriers. The calculation was made for 578 rotating bonds and the obtained distribution of rotational barriers is approximated by the corresponding Γ-distribution. 相似文献
364.
Gabriela Crkoov Pavol Alexy Duan Bako Karel Kolomazník Barbara imkov Lenka Precnerov 《Macromolecular Symposia》2001,170(1):51-60
The study is focused on the effect of collagen hydrolysate and glycerol on properties of water‐soluble polyvinylalcohol (PVA) blown films and blends. The experimental design method (DOE) was used in this study. Results from DOE show a strong effect of interactions between the blend components on resulting properties of the films. This fact was confirmed by means of the response surfaces of melting flow index, tensile strength and the content of insoluble fraction. It was concluded that the composition of PVA/CH blend must be precisely specified to avoid the processing complications. 相似文献