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  1. 5 Acta Biochimica Polonica

  2. 4 Current Topics in Biophysics

  3. 3 Applied Biology Communications. Lublin Scientific Center

  4. 2 Cellular and Molecular Biology Letters

  5. 1 Acta Ornithologica

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  1. 7 Buszman E.

  2. 6 Wilczok T.

  3. 3 Ezzahir A.

  4. 2 Bogacz A.

  5. 2 Chodurek E.

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  1. 1 2018

  2. 1 2017

  3. 1 2015

  4. 1 2014

  5. 1 2013

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1

The influence of melanin on the process of lipid peroxidation. Part 4: The influence of melanin on liposomal lipid peroxydation

100%
Ezzahir A.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 3
2

The influence of melanin on the process of lipid peroxidation Part.3: The influence of melanin on microsomal and partially oxidized membranes

80%
Ezzahir A.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 2
3

The influence of melanin on the process of lipid peroxidation. Part 1. The influence of melanin on photo-induced lipid peroxidation

70%
Ezzahir A.
Applied Biology Communications. Lublin Scientific Center
|
1991
|
tom 01
|
nr 6
4

Infrared studies of natural pheomelanins

70%
Kolczynska-Szafraniec U., Bilinska B.
Current Topics in Biophysics
|
1992
|
tom 16
|
nr 2
5

Intensity of melanin-based color and risk of predation in the Barn Swallow Hirundo rustica

61%
Galvan I., Nielsen J. T., Moller A. P.
Acta Ornithologica
|
2014
|
tom 49
|
nr 1
Predators are supposed to exert strong selection pressures on their prey, especially when phenotypic traits such as secondary sexual characters promote mating success at the expense of costs in terms of natural selection. Signaling theory predicts that individuals of superior phenotypic quality will enjoy an advantage in term of mating success, but also in term of natural selection, if such individuals are in prime condition both before and after development of exaggerated secondary sexual characters. We tested this prediction in the Barn Swallow Hirundo rustica being preyed upon by the Eurasian Sparrowhawk Accipiter nisus, using extensive samples of feathers from prey and non-prey. We measured tail length and coloration of outermost tail feathers in the black area of the proximal and distal part of tail feathers, but also the white spot of the tail feathers. Prey had significantly less dark distal, but not proximal parts of their tails, while there was no difference in coloration of the white spot between prey and non-prey. Prey had significantly paler tail feathers than non-prey, especially among long-tailed individuals. These results suggest that Barn Swallows with long tails that fail to deposit large amounts of melanin in their tail feathers run an elevated risk of predation.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Development of technology for obtaining water-soluble bacterial melanin and determination of some of pigment properties

61%
Aghajanyan A. E., Vardanyan A. A., Hovsepyan A. C., Hambardzumyan A. A., Filipenia V., Saghyan A. C.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2017
|
tom 98
|
nr 4
7

59Fe distribution and elimination after melanin administration in mice

61%
Nogaj P., Golek A., Bogacz A., Piatek K., Buszman E., Mossae I. B.
Acta Biochimica Polonica
|
1992
|
tom 39
|
nr 1
8

Interaction of Fe3, Cu2 and Zn2 with melanin and melanoproteins from bovine eyes

61%
Andrzejczak J., Buszman E.
Acta Biochimica Polonica
|
1992
|
tom 39
|
nr 1
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Antioxidant, antibacterial properties and the light barrier assessment of raw and purified melanins isolated from Citrullus lanatus (watermelon) seeds

51%
Lopusiewicz L.
Herba Polonica
|
2018
|
tom 64
|
nr 2
The nutritive value and terapeuthic activity of watermelon seeds is known, but up to day no studies on isolation and characterisation of their melanin were conducted. The aim of the study was to evaluate the antioxidant, antibacterial and light barrier properties of raw and purified melanins isolated from watermelon seeds. Native melanin was isolated from seeds by alkaline extraction. Obtained pigment was purified by acid hydrolysis. Chemical tests and FT-IR analysis were conducted to determine the melanin nature of the isolated pigments. UV-Vis, transmittance and colour properties were evaluated spectrophotometrically. Antioxidant activity was determined using ABTS and antibacterial activity through a well diffusion method. The results of the study demonstrated that melanins isolated from watermelon seeds had antioxidant, light barrier and antibacterial properties. A purified form of melanin had higher antioxidant activity and light barrier properties than the raw form. Both melanins inhibited the growth of Enterococcus faecalis and Pseudomonas aeruginosa. Watermelon seeds may be considered as a promising source of natural melanin which possess remarkable therapeutic action that can support the traditional use of this plant in the ethnomedicine.
10

Sclerotia of the acellular [true] slime mould Fuligo septica as a model to study melanization and anabiosis

51%
Krzywda A., Petelenz E., Michalczyk D., Plonka P. M.
Cellular and Molecular Biology Letters
|
2008
|
tom 13
|
nr 1
130-143
Acellular (true) slime moulds (Myxomycetes) are capable of a transition to the stage of sclerotium — a dormant form of plasmodium produced under unfavourable environmental conditions. In this study, sclerotia of Fuligo septica were analyzed by means of electron paramagnetic resonance (EPR) spectroscopy. The moulds were cultivated in vitro on filter paper, fed with oat flour, and kept until the plasmodia began to produce sclerotia. The obtained sclerotia differed in colour from yellow through orange to dark-brown. The EPR spectra revealed a free radical, melanin-like signal correlated with the depth of the colour; it was strongest in the dark sclerotia. Sclerotization only took place when the plasmodia were starved and very slowly dried. Only the yellow sclerotia were able to regenerate into viable plasmodia. This suggests that myxomycete cytoplasm dehydration is an active process regulated metabolically. Plasmodial sclerotization may therefore serve as a convenient model system to study the regulation of cytoplasmatic water balance, and sclerotia as a convenient material for EPR measurements, combining the quality of plasmodia with the technical simplicity of the measurements characteristic of dry spores. Darkening of the sclerotia is most probably a pathological phenomenon connected with the impairment of water balance during sclerotization.
11

Powstawanie melanoidyn

51%
Chopik V. V., Farrinas A., Gonzales E., Cinaz I.
Gazeta Cukrownicza
|
1989
|
tom 97
|
nr 06
12

The effect of metal ions incorporated into dopa-melanin on chloroquine binding ability

51%
Buszman E., Kwasniak B., Wilczok T.
Current Topics in Biophysics
|
1992
|
tom 16
|
nr 2
13

The influence of microwave power on the two-component ESR spectra of noradrenaline-melanin

51%
Pilawa B., Stepien K., Wilczok T.
Current Topics in Biophysics
|
1994
|
tom 18
|
nr 2
14

Physicochemical properties of melanin isolated from Cladosporium cladosporioides

51%
Buszman E., Wiewiora A., Andrzejczyk J., Wilczok T.
Current Topics in Biophysics
|
1992
|
tom 16
|
nr 2
15

Chernobyl effect: growth characteristics of soil fungi Cladosporium cladosporioides [Fresen] de Vries with and without positive radiotropism

51%
Zhdanova N., Fomina M., Redchitz T., Olsson S.
Polish Journal of Ecology
|
2001
|
tom 49
|
nr 4
16

Chemical characteristics of melanin from Cladosporium cladosporioides

51%
Chodurek E., Latocha M., Kurkiewicz S., Buszman E., Swiatkowska L., Wilczok T.
Bulletin of the Polish Academy of Sciences. Biological Sciences
|
1998
|
tom 46
|
nr 2
17
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Reflectance spectrophotometry of bruising in potatoes. I. Ultraviolet to near infrared

51%
Evans S. D., Muir A. Y.
International Agrophysics
|
1999
|
tom 13
|
nr 2
18

Evaluation of p-phenylene-bis and phenyl dithiocarbamate sodium salts and inhibitors of mushroom tyrosinase

41%
Amin E., Saboury A. A., Mansouri-Torshizi H., Zolghadri S., Bordbar A.-K.
Acta Biochimica Polonica
|
2010
|
tom 57
|
nr 3
 Two structurally related compounds, phenyl dithiocarbamate sodium salt (I) and p-phenylene-bis (dithiocarbamate) sodium salt (II) were prepared by reaction of the parent aniline and p-phenylenediamine with CS2 in the presence of sodium hydroxide. These water soluble compounds were characterized by spectroscopic techniques, IR, 1H NMR and elemental analysis. The inhibitory effects of both compounds on both activities of mushroom tyrosinase (MT) from Agricus bisporus were studied at two temperatures, 27ºC and 37ºC. L-3, 4-dihydroxyphenylalanine (L-DOPA), and l-tyrosine were used as natural substrates for the catecholase and cresolase enzyme reactions, respectively. Kinetic analysis confirmed noncompetitive inhibition mode of I and mixed type of II on both activities of MT; I and II inhibit MT with inhibition constants (KI) of 300 μM and 4 μM, respectively. Analysis of thermodynamic parameters indicated predominant involvement of hydrophobic interactions in binding of I and electrostatic ones in binding of II to MT. It seems that II is a more potent MT inhibitor due to its two charged head groups able to chelate copper ions in the enzyme active site. Intrinsic fluorescence studies as a function of concentrations of both compounds showed unexpectedly quenching of emission intensity without any shift of emission maximum. Extrinsic ANS-fluorescence indicated that only binding of I induces limited changes in the tertiary structure of MT, in agreement with the postulated hydrophobic nature of the binding mechanism.
19

Kumulacja i wydalanie jonow manganu u myszy w obecnosci jonow cynku i egzogennej melaniny

41%
Bogacz A., Bijak A., Buszman E., Wilczok T.
Bromatologia i Chemia Toksykologiczna
|
1995
|
tom 28
|
nr 4
377-382
Przebadano wpływ jonów Zn2+ i egzogennej melaniny na kumulację i szybkość wydalania jonów Mn2+ u myszy Balb c ( nie zawierających endogennej melaniny ) i C-57 Black (zawierających w sierści melaninę).
20

Splenic melanosis during normal murine C57BL/6 hair cycle and after chemotherapy

41%
Michalczyk-Wetula D., Salwinski A., Popik M., Jakubowska M., Plonka P. M.
Acta Biochimica Polonica
|
2013
|
tom 60
|
nr 3
 Cancer chemotherapy is associated with serious side effects, including temporary hair loss and impairment of pigmentation. We suspect that ectopic melanin deposition occurring due to chemotherapy may add to these effects worsening the already unpleasant symptoms. We associated the ectopic occurrence of follicular melanin after chemotherapy with splenic melanosis - an interesting example of extradermal melanin localization - and we expected an increase in splenic melanin deposition after chemotherapy. Using the C57BL/6 murine model of synchronized hair cycle induced by depilation, we visualized splenic melanin by means of several histological and histochemical protocols of staining: hematoxylin and eosin, May-Grünwald-Giemsa and Fontana-Masson. Unexpectedly, the splenic deposition of melanin decreased due to application of cyclophosphamide (i.p. 120 mg/ kg body weight on day 9 post depilation). The drop was abrupt and lasted for at least 5 days (day 13-18 post depilation), as compared with normal hair cycle. Moreover, in mice with normal, depilation-induced hair cycle we observed a similar drop shortly before entering catagen (day 15 post depilation), followed by a slow and partial increase in splenic melanization up to day 27 post depilation in both groups. We conclude that cyclophosphamide negatively affects splenic melanization and/or extradermal transfer of ectopic melanin from the dystrophic hair follicles, but the most powerful down-regulator of splenic melanosis is normal and dystrophic catagen - the phase of hair follicle involution and re-modelling.
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