Wyniki wyszukiwania

1

Assessing adulteration of extra virgin olive oil with lower quality oils using spectroscopic techniques

100%

Wojcicki K., Caponio F., Paradiso V. M., Pasqualone A., Summo C., Sikorska E.

Polish Journal of Food and Nutrition Sciences

|

2011

|

tom 61

|

nr Suppl.1

2

Spectroscopic studies of naproxen and tryptophan immobilized in polyvinyl alcohol

100%

Sabara D.M. D. M., Dunne J.S. J. S., Pedro A.Q.H. A. Q. H., Trifunovic J. J., Balogun I.I.O. I. I. O., Kotlicic O. O., Serrano A. A., Kertesz I. I.

Biotechnology and Food Science

|

2011

|

tom 75

|

nr 1

3

The application of near infrared reflectance spectroscopy [NIR] for determination of water content in meat products

100%

Uchman W., Kaczmarek-Duszek J., Zabielski J.

Food Science and Technology. Scientific Papers of Agricultural University of Poznan

|

1997

|

tom 01

4

Studying the structure of the cured phenol-formaldehyde resin modified with hydrogen peroxide with 13C NMR spectroscopy method

100%

Czarnecki R., Lecka J.

Roczniki Akademii Rolniczej w Poznaniu. Technologia Drewna

|

2001

|

tom 35

5

Molecular interactions and dynamics in liposome-drug systems revealed by EPR spectroscopy

100%

Grof P.

Cellular and Molecular Biology Letters

|

2005

|

tom 10

|

nr Suppl.

6

Evaluation of implant recipient interactions by ESR spectroscopy

100%

Plonka P., Plonka B., Lukiewicz S. J.

Current Topics in Biophysics

|

1994

|

tom 18

|

nr 1

7

Attempt at estimation of archeological wood decay with the use of the solid-state 13C NMR CP-MAS spectroscopy

100%

Babinski L., Pradzynski W.

Roczniki Akademii Rolniczej w Poznaniu. Technologia Drewna

|

2001

|

tom 35

8

Application of IR spectroscopy for N2O determination. II. Determination of low nitrous oxide content using a double beam spectrometer

100%

Ryczkowski J.

Polish Journal of Environmental Studies

|

1995

|

tom 04

|

nr 2

Some basic experiments of nitrous oxide determination, utilizing a classic double beam spectrometer were performed. Known amounts of nitrous oxide were measured in atmospheric air, helium and exhaust gases. The experiments allowed determination of N20 in amounts of 80 and 4 ppmv, employing standard and long-path gas cells, respectively.

9

Inhibition study of adenosine deaminase by caffeine using spectroscopy and isothermal titration calorimetry

100%

Saboury A. A., Divsalar A., Ataie G., Amanlou M., Moosavi-Movahedi A. A., Hakimelahi G. H.

Acta Biochimica Polonica

|

2003

|

tom 50

|

nr 3

Kinetic and thermodynamic studies were made on the effect of caffeine on the activity of adenosine deaminase in 50 mM sodium phosphate buffer, pH 7.5, using UV spectrophotometry and isothermal titration calorimetry (ITC). An uncompetitive inhibition was observed for caffeine. A graphical fitting method was used for determination of binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to 350 uM by the microcalorimetry method, which agrees well with the value of 342 uM for the inhibition constant that was obtained from the spectroscopy method. Positive dependence of caffeine binding on temperature indicates a hydrophobic interaction.

10

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Chemical constituents of water hyacinth (Eichhornia crassipes) methanol leaf extract and its effect on selected enzymes of Periplaneta americana

84%

Adeleke G. E., Adedosu O. T., Ehigie L., Adegbola P. I., Olaniyi A. A., Agoola T. O., Ehigie A. F.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

|

2020

|

tom 101

|

nr 4

11

Binding of harmane to human and bovine serum albumin: fluorescence and phosphorescence study

84%

Galecki K., Despotovic B., Galloway C., Ioannidis A.-G., Janani T., Nakamura Y., Oluyinka G.

Biotechnology and Food Science

|

2012

|

tom 76

|

nr 1

12

Antioxidative properties of bee pollen extracts examined by EPR spectroscopy

84%

Rzepecka-Stojko A., Pilawa B., Ramos P., Stojko J.

Journal of Apicultural Science

|

2012

|

tom 56

|

nr 1

13

Application of NIR spectroscopy for sport supplements identification

84%

Wojcicki K.

Towaroznawcze Problemy Jakości. Polskie Towarzystwo Towaroznawcze

|

2017

|

nr 3

14

Quality of rapeseed bio-fuel waste: optical properties

84%

Sujak A., Muszynski S., Kachel-Jakubowska M.

International Agrophysics

|

2014

|

tom 28

|

nr 2

The objective of the presented work was to examine the optical properties of selected bio-fuel waste. Three independent optical methods: UV-Vis spectroscopy, infrared spectroscopy and chromametric measurements were applied to establish the possible quality control test for the obtained substances. The following by-products were tested: distilled glycerine, technical glycerine and matter organic non glycerine fraction from rapeseed oil bio-fuel production. The results show that analysis of UV-Vis spectra can give rapid information about the purity of distilled glycerine, while no direct information can be obtained concerning the concentration and kind of impurities. Transmission mode is more useful as compared to absorption, concerning the detection abilities of average UV-Vis spectrometers. Infrared spectroscopy can be used as a complementary method for determining impurities/admixtures in samples. Measurements of chroma give the quickest data to compare the colour of biofuel by-products obtained by different producers. The condition is, however, that the products are received through the same or similar chemical processes. The other important factor is application of well defined measuring background. All the discussed analyses are quick, cheap and non-destructive, and can help to compare the quality of products.

15

Microarchitecture and mineralization in Loricae of Phacotacean flagellates

84%

Dunlap J. R., Walne P. L.

Acta Protozoologica

|

1993

|

tom 32

|

nr 4

16

Capacitance and resistance of the bilayer lipid membrane formed of phosphatidylcholine and cholesterol

84%

Naumowicz M., Petelska A. D., Figaszewski Z. A.

Cellular and Molecular Biology Letters

|

2003

|

tom 08

|

nr 1

Capacity and electric resistance of lipid membranes composed of lecithin and cholesterol were determined. The components were chosen for the study because they were present in biological membranes. Capacitance of the lecithin and cholesterol membranes amounts to 0.38 and 0.61 μF/cm2, and resistance to 1.44xl04 and 2.12x 106 Ω cm2, respectively. A 1:1 complex appears as a result of lecithin-cholesterol membrane formation. Parameters of the membrane formed of the lecithin-cholesterol complex were determined: surface concentration (Γ3), capacitance (C3), and conductance (R 31), as well as the stability constant (K) of the complex. The mean values of those magnitudes are as follows: 4.265xl0-6 mol/m2, 0.54 μF/cm2, 1.381xl0-6 Ω-1 cm-2 and 3.748x107, respectively.

17

Investigation of a wide spectrum of inherited metabolic disorders by 13C NMR spectroscopy

84%

Bal D., Kraska-Dziadecka A., Gradowska W., Gryff-Keller A.

Acta Biochimica Polonica

|

2008

|

tom 55

|

nr 1

High-resolution 1H NMR spectroscopy of body fluids has proved to be very useful in diagnostics of inherited metabolic diseases, whereas 13C NMR remains almost unexploited. In this paper the application of 13C NMR spectroscopy of fivefold concentrated urine samples for diagnosis of selected metabolic diseases is reported. Various marker metabolites were identified in test urine samples from 33 patients suffering from 10 different diseases, providing information which could be crucial for their diagnoses. Spectra were accumulated for 2 h or overnight when using spectrometers operating at 9.4 or 4.7 T magnetic fields, respectively. Interpretation of the measurement results was based on a comparison of the peak positions in the measured spectrum with reference data. The paper contains a table with 13C NMR chemical shifts of 73 standard compounds. The method can be applied individually or as an auxiliary technique to 1H NMR or any other analytical method.

18

Application of techniques of instrumental analysis in investigation of lignin of wood and straw

84%

Nicewicz D.

Roczniki Akademii Rolniczej w Poznaniu. Technologia Drewna

|

2001

|

tom 35

19

The dependence of electrophoretic and spectroscopic properties of the pyruvate dehydrogenase complex on mono- and divalent ions

84%

Pawelczyk T., Easom R. A., Olson M. S.

Acta Biochimica Polonica

|

1994

|

tom 41

|

nr 1

The effects of various mono- and divalent ions on the pyruvate dehydrogenase complex (PDC) were investigated. To determine the radius of PDC under various conditions a two-dimensional agarose gel electrophoresis technique was used. The radius of PDC cross-linked with glutaraldehyde at ionic strength 0.04 M was calculated to be 22.0 ± 0.1 nm. The presence of K+, Na+ or HPO4 prevented changes in electromobility and of the calculated radius of PDC induced by alteration in ionic strength. The fluorescence emission spectra of PDC depended on the ionic strength and monovalent cations. The fluorescence intensity of PDC increased in the presence of 80 mM K+, and decreased in the presence of 80 mM Na+ with no shift in the emission maximum wavelength. Changes in the ionic strength to which PDC was exposed resulted in alteration of the UV absorption spectra in the 230 nm region. These alterations were prevented by HPO42- , whereas N+ or K+ ions had no effect on the UV absorption spectrum of PDC.

20

EPR spectroscopy of free radicals in the perfused heart

84%

Zweier J. L., Kuppusamy P.

Current Topics in Biophysics

|

1994

|

tom 18

|

nr 1

Ograniczanie wyników

Assessing adulteration of extra virgin olive oil with lower quality oils using spectroscopic techniques