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    Wyświetlanie 1-7 z 7
    Tytuł:
    Characterization of $Fe_3O_4$ Magnetic Nanoparticles Modified with Dextran and Investigation of Their Interaction with Protein Amyloid Aggregates
    Autorzy:
    Koneracká, M.
    Antošová, A.
    Závišová, V.
    Lancz, G.
    Gažová, Z.
    Šipošová, K.
    Juríková, A.
    Csach, K.
    Kováč, J.
    Tomašovičová, N.
    Fabián, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535048.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    87.14.em
    87.19.xr
    Opis:
    Functionalised magnetic nanoparticles composed of $Fe_3O_4$ particles stabilised by sodium oleate and subsequently modified with dextran (MFDEX) were prepared by the co-precipitation method. Their morphology and particle size distribution were observed by scanning electron microscopy and photon cross correlation spectroscopy. In order to confirm the modification of magnetite surface with dextran physical techniques, including infrared spectroscopy, thermal analysis, and magnetic measurement, were used. Finally, the effect of MFDEX on amyloid fibrillar aggregates of human insulin and hen egg white lysozyme, typical amyloidogenic proteins, was investigated. In vitro interaction of MFDEX with protein amyloid fibrils resulted into destruction of amyloid aggregates. The anti-amyloid activity makes MFDEX of potential interest as therapeutic agent against amyloid-related diseases.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 983-985
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons
    Autorzy:
    Švec, P.
    Mat'ko, I.
    Marcin, J.
    Kováč, J.
    Vlasák, G.
    Janičkovič, D.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534100.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    Opis:
    Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 832-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of post partum uterine involution on folliculogenesis, oestrus and conception in cows
    Wpływ poporodowej inwolucji macicy na folikulogenezę, ruję i zapłodnienie krów
    Autorzy:
    Zaleha, P.
    Vargova, M.
    Kadasi, M.
    Smitka, P.
    Smarzik, M.
    Kovac, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/843770.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Zootechniczne
    Opis:
    The ending of the puerperium has place when the first oestrus postpartum gestation is restored. To that end the anatomical and histological uterine involution must be completed and the hypothalamic-pituitary-gonadal axis must work properly to allow: oestrus, ovulation, conception, implantation, formation and persistence of corpus luteum of pregnancy. Therefore, early postpartum disorders such as NEB, abnormal gonadotropin secretion, uterine infection and other disorders could have subsequent deleterious effects on oocyte development and competence. However, low BCS coupled with severe NEB during this period suppresses pulsatile LH secretion, reduces ovarian responsiveness to LH stimulation and also reduces the functional competence of the follicle characterized by reduced oestradiol production and ultimately results in delayed ovulation. Normal oestrous cycles in cows coupled with overt signs of oestrus are essential so that insemination can occur at the appropriate time relative to ovulation. Also good nutrition management, environment conditions and welfare can support normal uterine postpartum involution and recurrence of cyclicity.
    Okres poporodowy kończy się w momencie wystąpienia pierwszej rui po porodzie. Wcześniej musi się zakończyć anatomiczna i histologiczna inwolucja macicy, a także prawidłowo funkcjonować oś podwzgórzowo-przysadkowo-gonadowa, aby umożliwić ruję, owulację, zapłodnienie, implantację, powstanie i utrzymanie ciążowego ciałka żółtego. Wczesne zaburzenia poporodowe, takie jak ujemny bilans energetyczny (NEB – negative energy balance), anormalna sekrecja gonadotropin, zakażenie macicy i inne zaburzenia mogą mieć szkodliwy wpływ na rozwój i wydolność oocytów. Niska punktowa ocena kondycji krowy (BCS – body condition score) w połączeniu z drastycznym NEB w okresie poporodowym tłumi pulsacyjną sekrecję hormonu luteinizującego (LH – luteinizing hormone), obniża zdolność reakcji jajników na stymulację LH, a także zmniejsza wydolność funkcjonalną pęcherzyków, co charakteryzuje się obniżoną produkcją estradiolu, i wreszcie, powoduje opóźnioną owulację. Normalne cykle rujowe u krów oraz jawne oznaki rui to zasadnicze warunki, aby inseminacja mogła nastąpić we właściwym czasie w stosunku do owulacji. Także dobry system żywienia, prawidłowe warunki środowiskowe i dobrostan zwierząt mogą być czynnikami wspomagającymi normalną poporodową inwolucję macicy i powrót cykliczności rui.
    Źródło:
    Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego; 2013, 09, 1
    1733-7305
    Pojawia się w:
    Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Injuries Among Slovenian Physical Education Teachers: A Cross-Sectional Study
    Autorzy:
    Kovac, M.
    Leskosek, B.
    Hadzic, V.
    Jurak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/90197.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    occupational health
    injuries
    physical educators
    age
    gender
    teaching level
    uraz
    wiek
    różnice związane z płcią
    zdrowie zawodowe
    płeć
    edukacja fizyczna
    Opis:
    A cross-sectional study was carried out to examine the frequency and types of serious injuries in physical educators throughout their professional career, in relation to their gender, age and teaching level, certain factors causing the injuries and the consequences of those injuries on their working ability. The subjects (n = 468) answered a self-administered questionnaire. In men, one group's higher frequency of injuries was 1.8 (95% CI [1.26, 2.57]) times higher than in women. Every year in age increased the odds for moving into a group with a higher frequency of injuries by 7.6% (95% CI [1.06, 1.10]). The most common injuries for both genders were lower limb injuries. The most common cause of injury was the teacher's own mistake. Over 60% of teachers had to modify their teaching after an injury. It is necessary to further explore preventive strategies to reduce injuries in these workers.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 87-95
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of respiratory diseases of serum lactate dehydrogenase and its isoenzyme patterns in calves
    Autorzy:
    Nagy, O.
    Tothova, C.
    Seidel, H.
    Paulikova, I.
    Kovac, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/32337.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    In this study we examined the serum activity of lactate dehydrogenase (LDH) and its isoenzyme patterns in 28 calves of a lowland black spotted breed and its crossbreeds at the age of 2-6 months suffering from clinically noticeable manifested respiratory diseases – bronchopneumonia (BRD Group). As a control group we used 35 clinically healthy calves of the same age, breed and nutrition (Healthy Group). The sick calves did not show clinical signs or pathological lesions on other organ systems. The results found in sick calves showed a significantly higher total activity of LDH than in clinically healthy animals (P<0.01). The mean activity of LDH was 2012 U/l in healthy calves and in calves with respiratory diseases 2529 U/l. The differences in all LDH isoenzyme patterns between both groups of animals were significant (P<0.001) and in calves with respiratory diseases are characterized by a marked increase of the LDH 1 fraction and a decrease in the proportion of the other four LDH isoenzymes. Our results differ from those observed and presented in respiratory diseases in human medicine or in sheep. The explanation for the obtained results in calves and the determination of their diagnostic significance needs further studies and investigations using more animals with various severity of clinical signs and pathological changes, including analysis and determination of lactate dehydrogenase isoenzyme patterns in healthy and affected cattle lung tissue.
    Źródło:
    Polish Journal of Veterinary Sciences; 2013, 16, 2
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The serum protein electrophoretic pattern and acute phase protein concentrations in calves with chronic respiratory diseases
    Autorzy:
    Tothova, C.
    Nagy, O.
    Kovac, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/30757.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The aim of this study was to evaluate the serum protein electrophoretic pattern and the concentrations of acute phase proteins (haptoglobin, serum amyloid A, and fibrinogen) in 28 calves with clinical signs of chronic respiratory diseases and 36 healthy calves as a control group. In sick calves we found significantly higher serum concentrations of total proteins (P<0.001), lower concentrations of albumin (P<0.001) and marked shift in the concentrations of the most of protein fractions with significantly higher values of α₁₋, β₁₋, β₂₋, and γ-globulins (P<0.001 and P<0.01). The affected calves had significantly higher values of haptoglobin, serum amyloid A, and fibrinogen as well (P<0.05, P<0.001 and P<0.001, respectively).
    Źródło:
    Polish Journal of Veterinary Sciences; 2013, 16, 2
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanochemical Reduction of Chalcopyrite CuFeS₂: Changes in Composition and Magnetic Properties
    Autorzy:
    Baláž, P.
    Zorkovská, A.
    Baláž, M.
    Kováč, J.
    Tešinský, M.
    Osserov, T.
    Guseynova, G.
    Ketegenov, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032642.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    81.05.Hd
    Opis:
    High-energy milling of sulphides with a reactive metal in so-called mechanochemical reduction mode can lead to products in nanorange and to composition which simplifies the following metallurgical processing. Chalcopyrite CuFeS₂, a ternary semiconductor with antiferromagnetic properties represents promising candidate as an advanced material for use in inexpensive nanoelectronics (solar cells, magnetic area), as well as copper ore source in metallurgical operations. In this work, the process of mechanochemical reduction of chalcopyrite with elemental iron is studied. The composition and properties of nanopowder prepared by high-energy milling were analyzed by X-ray diffraction and magnetic measurements. Most of the reaction takes place during 30 min with chalcocite Cu₂S and troilite FeS as the only reaction products. The magnetic investigations reveal significant increase of saturation magnetization as a result of milling. Unlike the conventional high-temperature reduction of chalcopyrite, the mechanochemical reduction is fast and ambient temperature and atmospheric pressure are sufficient for its propagation.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1165-1167
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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