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    Wyświetlanie 1-15 z 15
    Tytuł:
    Effect of Lead Cumulation on Boron Content in Some Vegetables
    Wpływ kumulacji ołowiu na zawartość boru w niektórych warzywach
    Autorzy:
    Gawęda, M.
    Nizioł-Łukaszewska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/388919.pdf
    Data publikacji:
    2011
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    kumulacja ołowiu
    bór
    sałata
    szpinak
    rzodkiewka
    cebula
    burak ćwikłowy
    marchew
    lead accumulation
    boron
    lettuce
    spinach
    radish
    onion
    red beet
    carrot
    Opis:
    Six spectes of vegetable plants: lettuce Lectuca sativa L., spinach Spinacia oleracea L., radish Raphanus sativus L. subvar. radicula Pers., onion Allium cepa L. var. cepa, red beets Beta vulgaris L. and carrot Daucus carota L. were cultivated in pots on a substrate containing lead dosed O, 250 and 500 mg o kg-1 d.m. Increase of lead content in substrate caused its intensive cumulating in edible parts of the tested vegetable species. At the same time boron content increased in tissues of all analysed plants: in lettuce leaves by 9.7 % after supplying 250 mg Pb o kg-1 d.m., and by 19.8 % after supplying 500 mg Pb o kg-1 d.m., in spinach leaves by 13.8 % (only under the influence of higher dose), in radish roots by 5.1 and 24.6 %, in onion by 23.9 and 39.1 %, in beetroots by 14.9 and 41.2 % and in carrot roots by 8.6 and 24.6 %.
    Sześć gatunków roślin warzywnych: sałatę Lactuca sativa L., szpinak Spinacia oleracea L., rzodkiewkę Raphamts sativus L. subvar. radicula Pers., cebulę Allium cepa L. var. cepa, buraki ćwikłowe Beta vulgaris L. i marchew Daucus carota L. uprawiano w wazonach na podłożu z dodatkiem ołowiu w ilości: O, 250 i 500 mg o kg-1 s.m. Zwiększenie zawartości ołowiu w podłożu spowodowało jego intensywną kumulację w jadalnych częściach testowanych gatunków warzyw. Równocześnie wzrosła zawartość boru w tkankach wszystkich analizowanych roślin: w liściach sałaty o 9,7 % pod wpływem dawki 250 mg Pb o kg-1 d.m. podłoża i o 19,8 % pod wpływem dawki 500 mg Pb o kg-1 d.m., w liściach szpinaku o 13,8 % (tylko pod wpływem większej dawki Pb), w zgrubieniach rzodkiewki o 5,1 i 24,6 %, w cebuli o 23,9 i 39,1 %, w korzeniach buraków o 14,9 i 41,2 %, w korzeniach marchwi o 8.6 i 24,6 % odpowiednio pod wpływem dodatku 250 i 500 mg o kg-1 d.m. podłoża.
    Źródło:
    Ecological Chemistry and Engineering. A; 2011, 18, 1; 19-26
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expression of EpCAM protein in gastric cancer cells may contribute to its histogenesis
    Autorzy:
    Nizioł, M.
    Kuczyńska, P.
    Misiura, M.
    Zińczuk, J.
    Zaręba, K.
    Ustymowicz, W.
    Ćwiklińska-Dworakowska, M.
    Baszun, M.
    Jelski, S.
    Guzińska-Ustymowicz, K.
    Pryczynicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918619.pdf
    Data publikacji:
    2018-06-18
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Adhesion
    EpCAM
    gastric cancer
    Opis:
    Introduction: EpCAM protein belongs to adhesion molecules of epithelial cells. It mediates in the homophile adhesion cell-cell reactions. EpCAM protein expression can be observed in the majority of healthy normal cells. However, mutations in EpCAM gene may lead to an increased risk of cancer development. The aim of the study was to assess EpCAM protein expression in the correlation with chosen clinical and histological parameters in gastric cancer. Materials and Methods: EpCAM protein expression was evaluated immunohistochemically in 88 patients diagnosed with gastric cancer. Results: An increase in EpCAM protein expression was demonstrated in cancer cells compared to normal gastric mucosa (59.3% cancers with the positive expression of EpCAM protein). The increased EpCAM protein expression was observed in patients with a histological type of adenocarcinoma without a mucinous component than in those with adenocarcinoma with a mucinous component (p=0.028). The higher expression of this protein was observed also in the intestinal type according to the Lauren classification (p=0.037). The expression of the protein was lower in the diffuse type of cancer. Additionally, an increase in EpCAM protein expression was revealed in cancers infiltrating to the blood vessels (p=0.013). Conclusions: A correlation between EpCAM expression and adenocarcinoma without a mucinous component as well as the intestinal type according to the Lauren classification may prove a role of this protein in the histogenesis of gastric cancer. Moreover, its positive expression is related to cancerous cells infiltrating to the blood vessels, which may suggest a role of EpCAM protein in the early stages of gastric cancer metastases.
    Źródło:
    Progress in Health Sciences; 2018, 8(1); 74-79
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunohistochemical Fascin-1 expression correlate with lymph node and distant metastases in pancreatic ductal adenocarcinoma
    Autorzy:
    Pryczynicz, A.
    Nizioł, M.
    Miniewska, K.
    Kamińska, D.
    Kuczyńska, P.
    Zińczuk, J.
    Zaręba, K.
    Guzińska-Ustymowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918748.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Fascin-1
    metastases
    pancreatic ductal adenocarcinoma
    Opis:
    Introduction: Pancreatic cancer is characterized by its aggressiveness and poor prognosis. Furthermore, mortality is one of the highest among all types of cancers. It has been observed that the expression of Fascin-1 (the actin-bundling protein which enables the motility of cells) is higher in cancer cells and is correlated with invasiveness and metastasis. Purpose: To investigate the expression of Fascin-1 in histopathological specimens from patients treated for pancreatic cancer and its relationship with histopathological parameters. Materials and methods: The study was performed on a group of 52 patients diagnosed with pancreatic cancer in the Medical University of Bialystok Clinical Hospital. The expression of Fascin-1 was evaluated in tissue samples using the immunohistochemical method and was rated as “present” or “absent”. The analysis of histopathological parameters was performed in correlation with Fascin-1 expression. Results: Fascin-1 expression was observed in the cytoplasm of cancer cells in 42/52 cases (80.8%). Fascin-1 expression occurred more frequently among patients with lymph node metastases (92.6%) than without this type of metastases (68%) (p=0.024). Likewise, the expression of the investigated protein was observed more often with the presence of distant metastases (100%) than without those metastases (74.4%) (p=0.043). There were no statistically significant differences about age, sex, histological type of cancer, grade of histological differentiation, desmoplasia, inflammatory infiltration, foci of hemorrhage, necrosis, and MVD. Conclusion: The expression of Fasicn-1 is correlated with the presence of metastases and can be a useful marker of pancreatic cancer involvement.
    Źródło:
    Progress in Health Sciences; 2018, 8(2); 124-130
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leisure time physical activity of young women from the Carpathian Euroregion in relation to the Body Mass Index
    Autorzy:
    Zadarko, E.
    Barabasz, Z.
    Niziol-Babiarz, E.
    Zadarko-Domaradzka, M.
    Barabasz, M.
    Sobolewski, M.
    Palanska, A.
    Bergier, J.
    Junger, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/49954.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Transport Properties of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in View of KKR-CPA Results
    Autorzy:
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956503.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    We present results of the electronic structure study for the solid solution (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P (space group P6̅2m). The samples were synthesized for x=0.0 up to 0.15. From the electrical conductivity measurements on these materials, it was verified that resistivity increases with increasing temperature up to the Curie point T$\text{}_{C}$ and changes the slope at T$\text{}_{C}$ decreasing when temperature is raised above T$\text{}_{C}$. To get insight into the possible origin of such observations, we carried out the Korringa-Kohn-Rostoker-coherent potential approximation electronic structure calculations for (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in the range of concentration x=0.0 up to 1.0. It was found that alloying with Ni in Fe$\text{}_{2}$ P causes vanishing of spin band splitting and non-rigid band behaving of electronic valence states near the Fermi level. The polarization factor for electrons at E$\text{}_{F}$ changes in (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P with increasing x, and interestingly, it reaches maximum at x=0.1, closely to the concentration (x=0.08), when the largest value of T$\text{}_{C}$ and a kink in temperature dependent resistivity were detected.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 475-478
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Phase Transitions and Critical Behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P System
    Autorzy:
    Średniawa, B.
    Duraj, R.
    Pacyna, A.
    Bombik, A.
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Nizioł, S.
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013735.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Cc
    71.20.Lp
    Opis:
    This report focuses on magnetoelastic properties and critical behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 921-925
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Properties of MnRhAs$\text{}_{1-x}$p$\text{}_{x}$ and Band Structure Results from KKR-CPA
    Autorzy:
    Zach, R.
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956499.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    The magnetoelastic phase transitions were observed in MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (space group P6̅2m) by X-ray measurements (80 K < T < 300 K). For x = 0.33 and x = 0.4 contents an abrupt change of both lattice parameters and of the elementary cell volume at the metamagnetic transition was detected. The Korringa-Kohn-Rostoker electronic structure calculations performed for MnRhP compound show significant variations of densities of states at the Fermi level, while changing lattice data. The Korringa-Kohn- Rostoker-coherent potential approximation studies of disordered MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (x=0.6, 0.8, 1.0) were done at the ferromagnetic region. From our calculations we observe moving of bands near E$\text{}_{F}$, while substituting with isoelectronic metalloid, likely as while changing the crystal data in MnRhP.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 471-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MicroRNA expression profiles in liver and colon of sexually immature gilts after exposure to Fusarium mycotoxins
    Autorzy:
    Brzuzan, P.
    Wozny, M.
    Wolinska-Niziol, L.
    Piasecka, A.
    Florczyk, M.
    Jakimiuk, E.
    Gora, M.
    Luczynski, M.K.
    Gajecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087983.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    To improve our knowledge of the role of microRNAs (miRs) in responses of the porcine digestive system to two Fusarium mycotoxins, zearalenone (ZEN) and deoxynivalenol (DON), we examined the expression of 7 miRs (miR-9, miR-15a, miR-21, miR-34a, miR-122, miR-125b, and miR-192), previously found to be deregulated in diseased liver and colon cells. In this study, immature gilts were exposed to NOEL doses of ZEN (40 |ig/kg/d), DON (12 |ig/kg/d), ZEN+DON (40 + 12 |ig/kg/d), and placebo (negative control group) for 7,14, 21, 28, 35, and 42 days. Before the treatment, expression levels of the selected miRs were measured in the liver, the duodenum, the jejunum, and the ascending and the descending colon of the gilts. Hierarchical clustering of the tissues by their miR expression profiles was consistent with what would be expected based on the anatomical locations and the physiological functions of the organs, suggesting that functions of the miRs are related to the specificities of the tissues in which they are expressed. A subset of 2 pairs of miRs (miR-21+miR-192 and miR-15a+miR-34a), which were assigned to two distinct clusters based on their tissue abundance, was then evaluated in the liver and the ascending and the descending colon during the treatment. The most meaningful results were obtained from the ascending colon, where a significant effect of the treatment was observed, suggesting that during the exposure to mycotoxins, the pathways involved in cell proliferation and survival were disordered. Changes in miR expression in the liver and the descending colon of the treated gilts were smaller, and were associated more with treatment duration than the exposure to ZEN, DON, or ZEN+DON. Further research should focus on identification of genes whose expression is regulated by these aberrantly expressed miRs. This should facilitate understanding of the miRNA-regulated biological effects of mycotoxins.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutron Diffraction Studies of MnFeAs$\text{}_{y}$P$\text{}_{1-y}$ System
    Autorzy:
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Soubeyroux, J. L.
    Nizioł, S.
    Fruchart, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861313.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.25.+z
    Opis:
    Magnetic structures of the MnFeAs$\text{}_{y}$P$\text{}_{1-y}$ system were examined by means of the neutron diffraction technique in the 1.5-300 K temperature range. Atomic ordering in the metal sublattices, temperature dependence of the incommensurate (y = 0.2 and y = 0.275) and of the ferromagnetic (y = 0.275, y = 0.3, y = 0.5) ordering is discussed.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 229-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rehydration of CTMA Modified DNA Powders Observed by NMR
    Autorzy:
    Harańczyk, H.
    Kobierski, J.
    Zalitacz, D.
    Nowak, P.
    Romanowicz, A.
    Marzec, M.
    Nizioł, J.
    Hebda, E.
    Pielichowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490149.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.56.Na
    Opis:
    The rehydration of salmon sperm deoxyribonucleic acid (DNA) and cetyltrimethylammonium chloride $(C_{19}H_{42}ClN)$ complexes was observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). The hydration kinetics shows (i) a very tightly bound water not removed by incubation over silica gel ($A_0^{h}$ = 0.061 ± 0.004), (ii) a tightly bound water saturating at $A_1^{h}$ = 0.039 ± 0.011, with the hydration time $t_1^{h}$ = (1.04 ± 0.21) h, a loosely bound water fraction (iii) with the hydration time $t_2^{h}$ = (19.1 ± 3.2) h and the contribution progressively increasing with the air humidity. For the hydration at $p//p_0$ = 100%, after $t_0$ = (152.6 ± 2.5) h of incubation the swelling process begins. The swelling time was $t_3^{h}$ = (12.5 ± 5.4) h, and the swelling amplitude $A_3^{h}$ = 0.140 ± 0.016. The sorption isotherm is sigmoidal in form and is fitted by the Dent model with the mass of water saturating primary binding sites Δ M/$m_0$ = 0.102 ± 0.021. Proton free induction decay is a superposition of the immobilized proton signal (Gaussian, with $T_{2S}$* ≈ 30 μs) and two liquid signal components coming from tightly bound ($T_{2 L_1}$* ≈ 100 μs) and loosely bound water fraction with the amplitude proportional to the mass of water added ($T_{2 L_2}$* ≈ 1000 μs).
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 485-490
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected indicators of the root quality of fifteen cultivars of red beet (Beta vulgaris L.)
    Autorzy:
    Niziol-Lukaszewska, Z.
    Gaweda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2018.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    red beet
    Beta vulgaris
    variation
    root quality
    antioxidant activity
    betalain pigment
    soluble sugar
    Źródło:
    Journal of Horticultural Research; 2015, 23, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symptoms of colorectal cancer contributes to its localization and advancement
    Autorzy:
    Nizioł, M.
    Kostrzewska, B.
    Kamińska, D.
    Domurat, M.
    Zińczuk, J.
    Misiura, M.
    Guzińska-Ustymowicz, K.
    Pryczynicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918846.pdf
    Data publikacji:
    2019-08-26
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Cancer localization
    colorectal cancer
    symptoms
    Opis:
    Introduction: Colorectal cancer is one of the most common cancers occurring in Poland. Unfortunately, this cancer is most often diagnosed at the time of great advancement. This is caused by the appearance of specific symptoms only in the late stages of cancer. Also, such low detection of early stages of adenocarcinoma may be caused by disregarding of slight symptoms. Purpose: To analyse symptoms in patients with colorectal cancer and correlate with chosen clinical-pathological parameters. Materials and methods: The study group consisted of 46 patients diagnosed with colorectal cancer. Information on symptoms associated with cancer (subjective and objective) have been selected from patients' medical history. The presence of these symptoms was correlated with the age and sex of patients, tumor location, histological type of cancer, grade of histological malignancy (G), stage of tumor (T stage), presence of lymph node metastases and distant metastases. Results: It has been shown that the presence of pain complaints described by the patient are associated with the occurrence of cancer in the colon. The painfulness and pathological resistance diagnosed by the physician are more often associated with cancer located in the colon. In the case of tumors located in the rectum, faecal admixtures appear more frequently. It has also been shown that the presence of admixtures of blood and mucus in the stool is associated with more advanced local tumors, infiltrating pericolorectal tissues (T3 + T4). Conclusions: Familiarity with clinical symptoms of colorectal cancer could make patients more sensitive to more often screening for cancer. Analysis of these symptoms could indicate to the physician the location or stage of the cancer.
    Źródło:
    Progress in Health Sciences; 2019, 1; 76-82
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The relation between subjective health-assessment and cardiorespiratory fitness in adolescents
    Autorzy:
    Barabasz, Z.
    Zadarko-Domaradzka, M.
    Penar Zadarko, B.
    Nizioł-Babiarz, E.
    Zadarko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917299.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    health self-assessment
    cardiorespiratory fitness
    health measurements
    Opis:
    Introduction: Health perception is a complex issue and determined by various factors. When assessing health there are positive, negative and intermediate measurements, as well as health indicators including the following criteria: subjective, objective and social. Purpose: To determine the relationship between subjective health assessment, physical fitness and cardiorespiratory fitness. Materials and Methods: The study included 1.000 high school adolescents from Poland and Ukraine. Two questionnaires were used in the study: an original questionnaire, and a standardized 20 m shuttle run test with PACER (Progressive Aerobic Cardiovascular Endurance Run), enabling indirect assess of VO2 max. Results: Significant differences between subjective health assessment, physical fitness and cardiorespiratory fitness were found. The best health self-assessment and physical fitness, the best cardiorespiratory fitness results were obtained among adolescents. Polish youth better assessed their health in comparison to the peers from Ukraine. Conclusions: There is a relation between subjective health assessment and the objective parameters. When measuring health state of individuals or groups it is worth consider a subjective criterion of health.
    Źródło:
    Progress in Health Sciences; 2015, 5, 1; 150-155
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    White noise excited vibrations of viscoelastic shallow shells
    Autorzy:
    Nizioł, J.
    Kozień, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/279764.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    shallow shells
    vibrations
    viscoelasticity
    white noise
    Opis:
    The paper presents the results of the analysis of randomly excited vibrations of viscoelestic shallow shells. The parameter of interest is the dispersion of velocity normal to the element surface. The choice of parameter is motivated by estimation of the noise generated by a vibrating panel.
    Drgania lepkosprężystych powłok małowyniosłych poddanych wymuszeniu losowemu typu białego szumu W artykule omówiono rezultaty analiz drgań powłok małowyniosłych wykonanych z materiału lepkosprężystego i poddanych wymuszeniu losowemu typu białego szumu. Jako parametr opisujący drgania przyjęto dyspersję składowej prędkości normalnej do powierzchni środkowej powłoki. Wybór tego parametru jest uzasadniony faktem, iż jego wartość może być miarą wartości mocy akustycznej promieniowanej przez drgający element.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2000, 38, 2; 351-366
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ rodzaju rozpuszczalnika na wybrane biologiczne właściwości ekstraktów z liści pietruszki zwyczajnej Petroselinum crispum (Mill)
    Impact of solvent type on some selected biological properties of parsley Petroselinum crispum (Mill) leaf extracts
    Autorzy:
    Gawel-Beben, K.
    Rybczynska, K.
    Bujak, T.
    Karas, M.
    Jakubczyk, A.
    Niziol-Lukaszewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/828277.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    pietruszka
    przeciwutleniacze
    zwiazki fenolowe
    flawonoidy
    cytotoksycznosc
    ekstrakty roslinne
    Opis:
    Pietruszka zwyczajna (Petroselinum crispum Mill) jest wykorzystywana jako surowiec w przemyśle spożywczym m.in. ze względu na dużą zawartość związków fenolowych. W niniejszej pracy badano wpływ rozpuszczalników na skład oraz wybrane biologiczne właściwości ekstraktów z liści P. crispum. Porównano ekstrakty: wodny (W), etanolowy (ET), glikolowo-wodny (GLW) i glicerolowo-wodny (GCW). Największą zawartość związków fenolowych ogółem oznaczono w ekstraktach GLW (2,63 ± 0,03 mg/g s.m.) i GCW (2,12 ± 0,08 mg/g s.m.), natomiast najwięcej flawonoidów zawierał ekstrakt ET (0,86 ± 0,02 mg/g s.m.). Głównymi związkami fenolowymi ekstraktu wodnego były: epikatechina, katechina i jej pochodne, ekstraktu etanolowego – kwasy fenolowe (np. rozmarynowy), ekstraktu GLW – apigenina, natomiast ekstraktu GCW – daidzeina, naryngenina i pochodne. Oprócz znacznych różnic w składzie ilościowym i jakościowym badanych ekstraktów wykazywały one także zróżnicowaną aktywność przeciwrodnikową. Ekstrakt GCW w największym stopniu neutralizował rodnik DPPH• (IC₅₀ = 6,89 ± 056 μg/ml), natomiast ekstrakt W – kationorodnik ABTS•+ (IC₅₀ = 31,44 ± 4,11 μg/ml). Wszystkie ekstrakty wykazywały porównywalną zdolność do chelatowania jonów Fe²⁺. W badaniu cytotoksyczności ekstraktów w warunkach in vitro w stosunku do ludzkiej linii komórkowej BJ (ATCC CRL-2522) wykazano najwyższą cytotoksyczność ekstraktów ET i W. Cytotoksyczność ekstraktów GLW i GCW była porównywalna z cytotoksycznością samych rozpuszczalników. Dowiedziono wpływu rozpuszczalników na skład, właściwości przeciwutleniające oraz cytotoksyczność ekstraktów z P. crispum, wskazując równocześnie na możliwość zastosowania tych ekstraktów w przemyśle spożywczym.
    Parsley (Petroselinum crispum Mill) is used as a raw material in the food industry because it has, among other things, a high content of phenolics. Under the research study presented, the impact of solvents on the content and some selected biological properties of P. crispum extracts was studied. The following extracts were compared: aqueous (W), ethanolic (ET), aqueous-glycolic (GLW), and aqueousglycerinic (GCW). The highest concentration of total phenolics was determined in the GLW (2.63 ± 0.03 mg/g sm) and GCW (2.12 ± 0.08 mg/g sm) extracts, while the ET extract contained the highest amount of flavonoids (0.86 ± 0.02 mg/g sm). In the W extract, epicatechin, catechin and its derivates were the main phenolic compounds, in the ET extract: phenolic acids (e.g. rosmarinic acid), in the GLW extract: apigenin, and in the GCW extract: daidzein, naringenin, and the derivates. In addition to significant differences in the quantitative and qualitative composition of the extracts analysed, their antioxidant activity was highly differentiated. The GCW extract neutralized the DPPH• radical to the greatest extent (IC₅₀ = 6.89 ± 0.56 μg/ml) and the W extract: the ABTS•+ radical (IC₅₀ = 31.44 ± 4.11 μg/ml). All the extracts had a comparable ability to chelate Fe²⁺ ions. The in vitro analysis of cytotoxicity of the extracts against the BJ human cell line (ATCC CRL-2522) demonstrated that the ET and W extracts were the most cytotoxic ones. The cytotoxicity of GLW and GCW extracts was comparable to the cytotoxicity of that of the solvents. The impact was proved of the solvents on the content, antioxidant properties, and cytotoxicity of P. crispum leaf extracts, and, at the same time, it was suggested that it would be possible to use those extracts in the food, pharmaceutical, and cosmetic industry.
    Źródło:
    Żywność Nauka Technologia Jakość; 2016, 23, 1
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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