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1

Interrelationship between the process of surface wave generation caused by an air stream and wave attenuation process on water covered with a monolayer of crude oil derivative

100%
Pogorzelski S., Linde B., Sliwinski A.
Oceanologia
|
1986
|
tom 24
2
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Kinetic and thermodynamic study of phenol removal from water using activated carbon synthesizes from avocado kernel seed

84%
Kassahun D., Khalid S., Shimeles A. K.
International Letters of Natural Sciences
|
2016
|
tom 54
This study was aimed for removal of phenol from water using activated carbon synthesize from avocado kernel seeds by adsorption onto it. For adsorption process cleaned and washed avocado kernel seeds (Persea americana) were dried at 100°C in an oven overnight and carbonization was carried out by increasing the furnace temperature at a rate of 5 °C/min to a final temperature of 800 °C for 160 minutes. Then, the activated carbon was powdered and sieved, washed with distilled water until the solution pH reached 7.0. Optimization of activated carbon was performed through effects of solution pH, contact time; initial phenol concentration and temperature of the adsorption. The kinetic studies of the adsorption process were achieved by verifying various models and the data obtained was best fitted to pseudo-second-order kinetic model. The isotherms models were analyzed with Langmuir, Freundlich and Temkin to validate the adsorption process. It was found that Langmuir model was best fitted to the obtained result for both adsorbents.
3

Interaction of alkylresorcinols with proteins

84%
Kozubek A.
Acta Biochimica Polonica
|
1995
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tom 42
|
nr 2
Alkylresorcinol homologs form stable monomolecular layers at air-water interface. Their interaction with proteins present in the subphase results in an increase of alkylresorcinol molecular packing in the extent dependent upon the protein studied. Strongest effects were observed for proteins with large hydrophobic regions, e.g. glycophorin or serum albumin. Interaction of proteins with alkylresorcinol monolayers is stronger than with phospholipids. A decrease and a shift of intrinsic protein fluorescence upon interaction with the compounds studied support their involvement in alteration of hydrophobic regions. For trypsin, 50% quenching was observed at the alkylresorcinol/trypsin ratio of 0.75. Concomitantly, an apparent inhibition of the enzymatic activity was noted. These results indicate that direct interaction of alkylresorcinols and modulation of enzymatic activities should be recognised as a significant part of the biological effect of these cereal bran components.
4
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Impact of comminution on adsorption properties of gluten-free wheat starch

67%
Ocieczek A.
Acta Agrophysica
|
2013
|
tom 20
|
nr 1
The process of grinding of wheat grain endosperm leads to damage of the starch fraction. Starch damage in wheat flour changes its water absorption. Intact starch absorbs water in the amount of 70% of its mass, and damaged granules have up to 3-fold higher level of absorption, which is conditioned by the increased number of small crystalline structures and damage to many crystalline structures. These changes cause an increase of the volumetric water absorption capacity and it can be assumed that this will be reflected in the surface microstructure of starch particles that affect the adsorption of water vapour. The aim of the study was to evaluate the impact of comminu-tion of gluten-free wheat starch on the adsorption properties of its granules. The study included the determination of adsorption isotherms of water vapour at 20°C with the static-desiccator method and the determination of adsorption parameters and microstructure of starch granule surface based on the GAB and Kelvin equations. The results confirmed the positive impact of mechanical processing on the capacity of surface water vapour adsorption by starch granules and this was indicated by a significantly diversified distribution of adsorption isotherms, surface adsorption parameters and parameters of microstructure of molecules on which adsorption was tested.
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