Wyniki wyszukiwania - Biblioteka Nauki

1

Badania toksykokinetyki etylowej pochodnej bicyklofosforanu

100%

Smok W. , Kalski A.

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1994

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tom 27

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nr 3

261-263

PL

Zbadano kinetykę etylowej pochodnej bicyklofosforanu, która szybko przenika przez barierę krew-mózg oraz przez błony komórkowe. Jest szybko eliminowana z krwi, mózgu i wątroby. Ulega dystrybucji głównie w plynie wewnątrzkomórkowym.

EN

The kinetics of ethyl derivative of bicyclophosphate was studied using gas chromatography. The chemical quickly penetrated the blood/brain barrier and cellular membranes. It was quickly eliminated from blood, brain, and liver. The elimination constants and half times of elimination from the three organs were similar. The apparent distribution volume (37%) proves that the compound was distributed chiefly in intracellular fluid.

2

Oznaczanie etylobicyklofosforanu w materiale biologicznym metoda chromatografii gazowej

100%

Kalski A. , Smok W.

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nr 1

69-71

EN

A gas chromatographic procedure using methylbicyclophosphorothionate as an internal standard, for the determination of ethylbicyclophosphate in the brain, blood, and liver of small laboratory animals, was elaborated. The compound was extracted from the tissue with acetonitrile, and re-extracted from 2.5% sodium sulfate solution with chloroform. After evaporation of the solvent, the residue was dissolved in acetone. Chromatographic partition was carried out using a glass column (4 m x 0.4 cm) packed with 3% OV-17 on W/H.P. chromosorb at 250°C. Recovery of ethylbicyclophosphate ranged from 65% to 95%. Linear relationship of standard curve within the concentration range from 0.4 to 4.0 µg of ethylbicyclophosphate, was found. Precision for the assay of 2.0 µg samples, was 7.36%.

PL

Opracowano metodę oznaczania mikrogramowych ilości etylowej pochodnej bicyklicznego estru kwasu fosforowego metodą chromatografii gazowej w materiale biologicznym z wykorzystaniem metylowej pochodnej bicyklicznego estru kwasu tiofosforowego jako wzorca wewnętrznego.

3

Wpływ fosforanu dwumetylo-2,2-dwuchlorowinylowego (DDVP) oraz dwuizopropylofluorofosforanu (DFP) na ostrą toksyczność estrów, bicyklofosforoorganicznych (BCF)

80%

Smok W. , Wybrzak-Wrobel T. , Roczek E.

Bromatologia i Chemia Toksykologiczna

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1987

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tom 20

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nr 1

4

Electrospinning of PAN and composite PAN-GO nanofibres

80%

Matysiak W. , Tański T. , Smok W.

Journal of Achievements in Materials and Manufacturing Engineering

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2018

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tom Vol. 91, nr 1

18--26

EN

Purpose: The aim of this study was to present the influence of used reinforcement phase – graphene oxide (GO) and the electrospinning process parameters (the distance between the nozzle and collector) on the morphology and the structure of the obtained composite PAN-GO nanofibres. Design/methodology/approach: To produce pure polymer nanofibers, a 10% (wt.) electrospinning solution the polyacrylonitrile (PAN) was dissolved in N, N-dimethylformamide (DMF). The spinning solution used for electrospinning PAN-GO composite fibres was made by dissolving the PAN in a mixture of GO and DMF. By changing the configuration of the distance between the nozzle and collector (10 and 20 cm) and maintaining the remaining parameters (solution flow rate and potential difference between the electrodes), four samples in the form of nanofibrous mats were made. In order to identify the structure and morphology of the reinforcing phase, X-ray microanalysis (EDX) and scanning electron microscopy (SEM) were performed. In addition, the structure of graphene oxide microparticles was investigated by a Raman spectrometer. In order to determine the influence of the distance between the nozzle and the collector used in the electrospinning process and the addition of the reinforcing phase to the morphology and structure of the obtained PAN polymer nanofibres and PAN-GO composite nanofibres, they were examined using SEM. The analysis of the chemical composition of PAN and PAN-GO fibres was carried out using X-ray microanalysis. Findings: The morphology and structure analysis indicated that polymer nanofibres PAN for both the distances between the nozzle and the collector show no structural defects and presented same diameter over the entire length of the fibre. Nanofibres with the addition of GO obtained at both distances between the electrodes, showed defects in the form of beads. In addition, it was observed that with increasing distance between the nozzle and collector the diameter of obtained nanofibres is smaller for both pure PAN and composite PAN-GO samples. Research limitations/implications: The paper is the basis for further research in the field of the use of PAN-GO composite nanofibres as water purification materials. Originality/value: The electrospinning method can be an alternative to conventional methods for the production of filtering membranes due to the ease of carrying out the process and the fact that a material with a high specific surface area is obtained.

5

Thin SnO2 Films Manufactured Via the Sol-Gel and Electrospinning Methods

80%

Matysiak W. , Tański T. , Smok W. , Polishchuk O.

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2020

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tom Vol. 65, iss. 2

761--765

EN

The aim of this work was to produce a thin SnO2 film by a technique combining the sol-gel method and electrospinning from a solution based on polyvinylpyrrolidone and a tin chloride pentahydrate as a precursor. The spinning solution was subjected to an electrospinning process, and then the obtained nanofiber mats were calcined for 10 h at 500°C. Then, the scanning electron microscopy morphology analysis and chemical composition analysis by X-ray microanalysis of the manufactured thin film was performed. It was shown that an amorphous-crystalline layer formed by the SnO2 nanofiber network was obtained. Based on the UV-Vis spectrum, the width of the energy gap of the obtained layer was determined.

6

Thin SnO2 Films Manufactured Via the Sol-Gel and Electrospinning Methods

71%

Matysiak W. , Tański T. , Smok W. , Polishchuk S. , Matysiak W. , Tański T. , Smok W. , Polishchuk S.

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nr 2