Wyniki wyszukiwania

1

The spectral properties of stilbazolium merocyanine coplexes with Fe [II] and Fe [III] ions

100%

Cegielski R., Niedbalska M., Pajchrowski G., Manikowski H.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr Suppl.

2

Orientation and spectral properties of two stilbazolium merocyanine dyes in stretched and unstretched polyvinyl alcohol films

86%

Dudkowiak A., Frackowiak D., Teslak E., Gryczynski Z., Gryczynski I.

Acta Biochimica Polonica

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2007

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tom 54

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nr 3

Spectral properties (anisotropy coefficients calculated for absorption, emission and fluorescence decay time) of two stilbazolium merocyanine dyes have been determined to evaluate the applicability of these dyes as sensitizers in photodynamic therapy. The dyes were embedded in an anisotropic polymer matrix. Analysis of the emission decay components measured in polarized light provides information on the interactions of the dye molecules with the polymer matrix being a model of an anisotropic biological system. Different values of the emission anisotropies obtained from various polarized components of fluorescence decays have shown that the orientations of the dye molecules influence their interactions with the polymer. This means that differently oriented dye molecules located in biological systems should exhibit different interactions with membranes. The chain length and type of side groups attached as well as the salt form of the dye molecule were shown to influence the dye-polymer interactions and should be taken into account before the application of merocyanine dyes in medicine. These dyes seem to be promising optical sensors with spectral properties, including the calculated anisotropy coefficients, sensitive to the molecular environment, useful to study orientation and interaction with neighbouring molecules in biological membranes.

3

Spectral and potassium ion binding properties of benzo-15-crown-5 rubicene dye

86%

Stobiecka A.

Zeszyty Naukowe. Politechnika Łódzka. Chemia Spożywcza i Biotechnologia

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2004

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tom 68

4

Spectral properties of cultivation, leaves, and fruits of the aubergine

86%

Czarnowski M., Cebula S.

Folia Horticulturae

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1999

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tom 11

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nr 1

5

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Characteristics of humic acids from under crop rotations with differentiated cereal share

86%

Flis-Bujak M., Zukowska G.

Acta Agrophysica

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2001

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tom 52

This paper presents the results of studies carried out to estimate the influence of crop rotation, with diversified cereal shares on the humic acid characteristics. The tested range covered humic acids separated from the following soil types: degraded chernozem developed from loess, Orthic Luvisol developed from boulder clay, Orthic Luvisol developed from loess. Samples"were taken from the soil arable layer being under many-year crop rotation with a differentiated share of cereals (50 and 100%). The results obtained show that soil use affected quality indices of humic acids. In the lessive soils under cereal monocultures, an increase of the atomic H:C ratio was observed in humic acids. This allows for a conclusion that the monoculture system causes an increase in the content of aliphatic structures in humic acid molecules or a decrease in the condensation degree of their nuclei. Moreover, a decrease in the optic density of humin solutions given in A465 values was found in the humic acids under cereal monocultures which proves a marked direction of changes. In the case of humic acids extracted from chernozem, an analysis of elemental composition did not show any clear differentiation in the crop rotation with a 50% cereal share and a monoculture of cereal plants. The analysis of optic properties indicates a growth of the optic density (value of the E4:E6 ratio decreases) in the variant with a cereal plant monoculture which may suggest growth in the humification of individual humic acids.

6

Spectral properties of sweet pepper fruits

86%

Czarnowski M., Cebula S.

Folia Horticulturae

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1998

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tom 10

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nr 1

7

Spectral properties of phthalocyanines incorporated into resting and stimulated human peripheral blood cells

86%

Waszkowiak A., Frackowiak D., Wiktorowicz K., Miyake J.

Acta Biochimica Polonica

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2002

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tom 49

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nr 3

Human peripheral blood cells stimulated by phytohemagglutinin (which serve as a model of cancerous cells) and resting cells were incubated in dimethyl sulfoxide solutions of various phthalocyanines. In order to diminish the influence of atmospheric oxygen the cells were embedded in a polymer (polyvinyl alcohol) film. Fluorescence spectra of the samples were measured over two regions of excitation wavelengths: at 405 nm (predominant absorption of the cell material) and in the regions of strong absorption of phthalocyanines (at about 605 nm and 337 nm). The intrinsic emission of cell material became changed as a result both of cells' stimulation and of incubation of cells in dye solution. In most cases the stimulated cells when stained by dye exhibited higher long wavelength fluorescence intensity than resting cells. This suggests higher efficiency of dye incorporation into cancerous cells than into healthy cells. The absorption spectra of samples were also measured. The spectra of various phthalo- cyanines in incubation solvent, in polymer and in the cells embedded in polymer, were compared. The comparison of properties of the cells stimulated for different time periods enabled to establish the conditions of stimulation creating a population of cells incorporating a large number of sensitizing molecules.

8

Spectroboard: an instrument for measuring spectral characteristics of butterfly wings - new tool for taxonomists

72%

Balint Z., Wojtusiak J., Piszter G., Kertesz K., Biro R. P.

Genus. International Journal of Invertebrate Taxonomy

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2010

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tom 21

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nr 1

9

Spectral properties of propyl gallate in organic solvents and in heterogeneous environment

72%

Dwiecki K., Gornas P., Nogala-Kalucka M., Polewski K.

Acta Agrophysica

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2006

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tom 07

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nr 1[132]

10

Wskaźniki NDVI i PRI jako odzwierciedlenie dobowej zmienności frakcji akumulowanej energii fotosyntetycznie czynnej dla odłogu oraz dla wybranych gatunków roślin uprawnych

58%

Uzdzicka B., Juszczak R., Sakowska K., Chojnicki B. H., Urbaniak M., Olejnik J.

Acta Agrophysica

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2013

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tom 20

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nr 4

Frakcja akumulowanej energii fotosyntetycznie czynnej (fAPARcanopy) jest ważnym parametrem ekofizjologicznym, stosowanym między innymi do szacowania produkcji pierwotnej brutto (GPP) ekosystemów. W pracy przedstawiono zależności pomiędzy dobową zmiennością frakcji akumulowanej energii fotosyntetycznie czynnej a dwoma spektralnymi wskaźnikami roślinności – znormalizowanym różnicowym wskaźnikiem wegetacji (ang. Normalized Difference Vegetation Index, NDVI) i wskaźnikiem odbicia fotochemicznego (ang. Photochemical Reflectance Index, PRI). Pomiary wykonano 28 maja 2012 r. na poletkach eksperymentalnych z uprawami jęczmienia jarego, żyta ozimego i pszenicy ozimej oraz na poletku wieloletniego odłogu. Pomiary padającego, przepuszczonego i odbitego promieniowania w zakresie PAR (potrzebne do obliczenia fAPARcanopy) wykonano z wykorzystaniem systemu pomiarowego firmy Delta-T (Delta-T Devices, Cambridge, UK). Potrzebne do obliczenia NDVI i PRI pomiary promieniowania padającego i odbitego o długościach fali 530, 570, 670 i 849 nm wykonano używając dwóch czterokanałowych czujników SKR1850 (SKYE Instruments Ltd., Llandrindod Wells, UK), zamontowanych w pozycji zenit – nadir na przenośnym urządzeniu SpectroSense2+. Z zaprezentowanych danych wynika, że NDVI stanowi znacznie lepszy niż PRI spektralny wskaźnik dobowej zmienności fAPARcanopy roślin uprawnych. Uzyskane wyniki świadczą o tym, że fAPARcanopy nie jest jedynym czynnikiem kształtującym zmienne wartości wskaźników NDVI i PRI w cyklu dobowym.

Ograniczanie wyników

The spectral properties of stilbazolium merocyanine coplexes with Fe [II] and Fe [III] ions

Orientation and spectral properties of two stilbazolium merocyanine dyes in stretched and unstretched polyvinyl alcohol films

Spectral and potassium ion binding properties of benzo-15-crown-5 rubicene dye

Spectral properties of cultivation, leaves, and fruits of the aubergine

Characteristics of humic acids from under crop rotations with differentiated cereal share

Spectral properties of sweet pepper fruits

Spectral properties of phthalocyanines incorporated into resting and stimulated human peripheral blood cells

Spectroboard: an instrument for measuring spectral characteristics of butterfly wings - new tool for taxonomists

Spectral properties of propyl gallate in organic solvents and in heterogeneous environment

Wskaźniki NDVI i PRI jako odzwierciedlenie dobowej zmienności frakcji akumulowanej energii fotosyntetycznie czynnej dla odłogu oraz dla wybranych gatunków roślin uprawnych