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    Wyświetlanie 1-7 z 7
    Tytuł:
    The cryoprotective potential of propolis supplemented in frozen-thawed bull semen; biochemical and physiological findings
    Autorzy:
    Yeni, D.
    Gülhan, M.F.
    İnanç, M.E.
    Avdatek, F.
    Güngör, Ş.
    Türkmen, R.
    Tuncer, P.B.
    Taşdemir, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539069.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cryopreservation
    DNA damage
    oxidative stress
    propolis
    Opis:
    In this study, the cryoprotective effect of different doses of propolis (P) on bull semen, which has solid pharmacological properties thanks to its rich phenolic components, was investigated biochemically and physiologically. Semen samples were collected from Simmental breed bulls via the artificial vagina and pooled. After dividing into five groups, control (C: no additive) and four different P (200, 100, 50, and 25 μg/mL) groups, the final concentration was diluted to 16×106 per straw. Semen samples were equilibrated at 4°C for approximately 4 hours, then placed in French straws and frozen. After thawing, sperm motility and kinetic parameters, DNA integrity by single-cell gel electrophoresis, sperm abnormalities by liquid fixation, and lipid peroxidation levels by the colorimetric method was analyzed by Computer-Assisted Semen Analyzer. P added to the diluent showed no effect on motility and kinetic parameters at P25 and P50 (p>0.05), while P100 and P200 had a negative effect (p<0.001). The addition of P (25 and 50) showed a treatment effect on tail abnormality compared to C (p<0.05). Especially P50 had a positive effect on tail length, tail DNA, and tail movement, while P100 and P200 caused DNA damage (p<0.001). MDA levels increased in all P dose groups compared to C (p<0.001). This study has clearly demonstrated that P25 and P50 supplements could be used therapeutically to treat sperm tail abnormalities and prevent DNA damage in post-thawed bull sperm.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 1; 5-12
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of solubilization dynamics of manure organic matter and phosphorus as a function of pH control and enzyme supplementation
    Autorzy:
    Gungor, K.
    Alkan-Ozkaynak, A.
    Karthikeyan, K. G.
    Evrendilek, F.
    Gunasekaran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/208150.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biogeochemistry
    biological materials
    pH
    phosphorus
    biogeochemia
    materiały biologiczne
    fosfor
    Opis:
    The potential use of commercial enzyme and pH control has been investigated for enhancing dairy manure fermentation and modeling dissolved organic matter and orthophosphate (PO4-P) dynamics of fermenters. Anaerobic lab-scale batch fermenters (initial total solids concentration (TSo) = 3.8 wt. %) were fed with separated dairy manure solids and operated under pH controls (5 and 9.5). The enzyme-supplemented alkaline fermenters clearly outperformed the acidic fermenters in terms of chemical oxygen demand (COD) solubilization: ca. 50% vs. 20%, respectively. Soluble PO4-P in the acidic fermenters was comparably higher but constituted less than 20% of total phosphorus. Better soluble COD (>80%) and soluble PO4-P (>70%) yields were noted for the dilute fermenters (TSo = 0.6–0.8 wt. %). An existing model was retrofitted, calibrated and validated for simulating dynamics of soluble COD, volatile fatty acids, and soluble orthophosphate under various pH and enzyme conditions.
    Źródło:
    Environment Protection Engineering; 2016, 42, 2; 155-170
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary results of blood growth differentiation factor-9 (GDF-9) measurement in cats: future aspects of GDF-9 on stage of the cycle and spaying history
    Autorzy:
    Evkuran Dal, G.
    Baykal, A.
    Toydemir Karabulut, T.S.F.
    Dokuzeylul Gungor, N.
    Turna, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539104.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cats
    growth differentiation factor 9
    ovarian cycle
    ovary
    Opis:
    Growth differentiation factor-9 (GDF-9), an oocyte-derived member of the TGF-β superfamily, plays an essential role in regulation of follicular development. This study aimed to determine the cyclic changes in serum GDF-9 concentration, compare its levels before and after ovariohysterectomy (OHE), and investigate its potential as a tool in ovarian remnant syndrome (ORS) diagnosis in cats. GDF-9 measurements were performed on 50 cats referred for routine OHE. The stage of the estrous cycle was determined by vaginal cytology and measurement of serum estradiol and progesterone levels was carried out to detect the cyclic changes in circulating GDF-9. One week after OHE, serum samples were collected again from 30 cats to reveal differences in GDF-9 levels. GDF-9 levels in the follicular phase were significantly higher than those in the interestrus (p<0.05). The postoperative analysis could be performed. GDF-9 levels slightly decreased one week after OHE (p=0.053). In conclusion, blood GDF-9 levels change during the estrous cycle, and may decrease with age in cats. However, further studies are needed to reveal the efficiency of GDF-9 in ORS diagnosis.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 1; 149-154
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glocal leadership behaviors of managers working in private institutions
    Glokalne zachowania menadżerów pracujacych w prywatnych instytucjach
    Autorzy:
    Ercetin, S. S.
    Potas, N.
    Acikalin, S. N.
    Yilmaz, M.
    Kisa, N.
    Gungor, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/404684.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    global
    local
    glocal
    glocal leadership
    globalne
    lokalne
    glokalne
    glokalne przywództwo
    Opis:
    Glocalization is a holistic approach that balances global and local dimensions. As it affects organizations, glocal leadership has started to be discussed. The aim of this study is to reveal the perceptions of managers of private institutions about fulfilling glocal leadership behaviors, and investigate if there is a meaningful difference in terms of gender, age, seniority, and education level variables. This study is designed to be descriptive research using the Multidimensional Glocal Leadership Scale developed by Ercetin et. al (2011) to collect the data. The population of the research is a self-existing sample of 378 managers who work in private institutions. According to the findings, managers perceive they are fulfilling the glocal leadership behavior and its dimensions at middle level. There are some differences found for gender, age, seniority and education level variables.
    Glokalizacja jest holistycznym podejściem, które równoważy wymiary globalne i lokalne. Ponieważ dotyka organizacji, zaczęto dyskutować o glokalnym przywództwie. Celem tego badania jest ujawnienie poglądów menedżerów prywatnych instytucji na temat glokalnych zachowań przywódczych i zbadanie, czy istnieje istotna różnica pod względem płci, wieku, stażu pracy i poziomu wykształcenia. Badanie to ma charakter opisowy i wykorzystuje Wielowymiarową Skalę Przywództwa Glokalnego opracowaną przez Ercetina (2011). Populacja badania jest samodzielną próbą 378 menedżerów pracujących w instytucjach prywatnych. Zgodnie z ustaleniami, menedżerowie dostrzegają, że realizują glokalne zachowanie przywódcze i jego wymiary na poziomie średnim. Istnieją pewne różnice dotyczące zmiennych pod względem płci, wieku, stażu pracy i poziomu wykształcenia.
    Źródło:
    Polish Journal of Management Studies; 2017, 16, 2; 74-87
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grating-free high-x InP/InxGa1-xAs mid-wavelength infrared QWIP focal plane array
    Autorzy:
    Besikci, Cengiz
    Balcı, Saadettin V.
    Tanış, Onur
    Güngör, Oğuz O.
    Arpaguş, Esra S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2204209.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    infrared imaging
    quantum well
    infrared photodetector
    Opis:
    The authors report the characteristics of a diffraction-grating-free mid-wavelength infrared InP/In₀.₈₅Ga₀.₁₅As quantum well infrared photodetector focal plane array with a 640 × 512 format and a 15 µm pitch. Combination of a normal incident radiation sensing ability of the high-x InxGa1-xAs quantum wells with a large gain property of the InP barriers led to a diffraction-grating-free quantum well infrared photodetector focal plane array with characteristics displaying great promise to keep the status of the quantum well infrared photodetector as a robust member of the new generation thermal imaging sensor family. The focal plane array exhibited excellent uniformity with noise equivalent temperature difference nonuniformity as low as 10% and a mean noise equivalent temperature difference below 20 mK with f/2 optics at 78 K in the absence of grating. Elimination of the diffraction-grating and large enough conversion efficiency (as high as ~70% at a -3.5 V bias voltage) abolish the bottlenecks of the quantum well infrared photodetector technology for the new generation very small-pitch focal plane arrays.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144563
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-Empirical Formula with New Coefficients of the (α,n) Reaction Cross-Section
    Autorzy:
    Akça, S.
    Tel, E.
    Güngör, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401939.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.40.-h
    25.60.Dz
    Opis:
    A new modified semi-empirical formula including non-elastic scattering and Coulomb effects for the (α,n) reaction cross-section was obtained. The available experimental data were used to get the (α,n) reaction cross-section systematics. The dependence between the cross-section and asymmetry term was discussed for (α,n) reaction at 18.5±3 MeV energies classifying the target nuclei into odd Z-even N and even Z-even N. The coefficients of determination (R²) for all classifications were detected to exhibit the amount of relation between asymmetry term and cross-sections obtained from the modified semi-empirical formula with new coefficients.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-128-B-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of luteolin on spermatological parameters, apoptosis, oxidative stress rate in freezing rabbit semen
    Autorzy:
    Akarsu, S.A.
    Acısu, T.C.
    Güngör, İ.H.
    Çakır Cihangiroğlu, A.
    Koca, R.H.
    Türk, G.
    Sönmez, M.
    Gür, S.
    Fırat, F.
    Esmer Duruel, H.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647483.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    rabbit
    semen
    cryopreservation
    luteolin
    oxidative stress
    apoptosis
    Opis:
    The aim of the present study was to determine the effects of Luteolin (LUT) on semen quality, oxidative stress, apoptosis, acrosomal integrity, mitochondrial membrane potential and dead sperm ratio in rabbits. Ejaculates from six New Zealand rabbits were collected, evaluated and pooled. The pooling was divided into five groups as control (no additive) LUT 25 μM, LUT 50 μM, LUT 100 μM and LUT 200 μM and LUT added. It was then filled into a falcon tube with Tris-based extender at a final concentration of approximately 35 x 106 spermatozoa. Diluated rabbit semen samples were drawn into frozen and thawed. Frozen semen straws were thawed at 37°C in 30 seconds. According to our findings, no statistical difference was found between all doses of luteolin and the control group in the CASA (computer assisted sperm analysis) analysis performed at 4°C. However, total motility, progressive motility and rapid sperm percentage were found to be higher in the frozen and thawed rabbit semen at a dose of LUT 50 μM compared to the other groups (p<0.05). While amplitude of lateral head displacement (ALH) and beat cross-frequency (BCF) values were found at the lowest dose of LUT 200 μM, a statistically significant difference was observed between the other groups. When the flow cytometry results were examined, no statistical difference was found between the rate of dead sperm, acrosomal integrity, mitochondrial membrane potential and apoptosis rate. Morever, the H2O2 percentage was found to be lower in all experimental groups compared to the control group (p<0.001). In conclusion, the addition of LUT in long-term storage of rabbit semen provided a protective effect for spermatozoa with its antioxidative properties against damage caused by cryopreservation.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 91-98
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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