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    Wyświetlanie 1-14 z 14
    Tytuł:
    Recognition of Weave Patterns of Striped Fabrics Using Optical Coherence Tomography
    Rozpoznawanie wzorów splotów tkanin w paski przy użyciu optycznej tomografii koherencyjnej
    Autorzy:
    Sabuncu, M.
    Özdemir, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/234318.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    optical coherence tomography
    striped weave patterns recognition
    woven fabric
    plain weave
    twill weave
    optyczna tomografia koherencyjna
    rozpoznawanie wzorów splotów paskowych
    tkanina
    prosty splot
    splot diagonalny
    Opis:
    The recognition of woven fabric repeat by conventional techniques is labour intensive. In general, woven fabric repeat identification is accomplished automatically by employing complex algorithms and techniques. These algorithms may, however, occasionally fail, especially when dealing with high complexity texture patterns, structures, figures and colours. Optical coherence tomography (OCT) has the capability of taking high resolution images via contactless measurements. In this paper we apply the spectral domain optical coherence tomography imaging technique for identifying striped woven fabric repeat automatically. OCT scans corresponding to four different fabrics, from which the weave matrixes were recognised, are reported in this study. Automatic identification of weave patterns of striped fabrics was accomplished non-destructively by employing optical coherence tomography.
    Rozpoznanie powtórzenia tkaniny za pomocą konwencjonalnych technik jest pracochłonne. Ogólnie rzecz biorąc, identyfikacja powtórzenia tkaniny jest przeprowadzana automatycznie przez zastosowanie złożonych algorytmów i technik. Algorytmy te mogą jednak czasami zawieść, szczególnie w przypadku bardzo złożonych wzorów tekstur, struktur, figur i kolorów. Optyczna tomografia koherencyjna (OCT) ma zdolność wykonywania zdjęć o wysokiej rozdzielczości za pomocą pomiarów bezstykowych. W artykule zastosowano technikę obrazowania optycznego tomografii koherencji spektralnej do automatycznego rozpoznawania powtórzeń tkanin w paski. W badaniu przedstawiono skany OCT odpowiadające czterem różnym materiałom, z których rozpoznano matryce splotu. Automatyczna identyfikacja wzorów splotów tkanin w paski została przeprowadzona w sposób niedestrukcyjny dzięki zastosowaniu optycznej tomografii koherencyjnej.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 3 (129); 98-103
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of $Na_2O//K_2O$ Ratio on the Deformation Behaviour of the Floor Tile Bodies
    Autorzy:
    Tamsu, N.
    Vedat Bayrak, A.
    Ozdemir, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399791.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    Opis:
    Floor tile bodies have excellent technical characteristics particularly as regards mechanical properties and frost resistance. Besides of these properties they could not have any deformation during firing. Considering floor tiles are generally fired in roller kilns, tiles are moving along the kiln carried by the rollers. It is possible that tiles can be bended by the roller movement because it is submitted to vertical forces due to its own weight. Pyroplastic deformation is the bending of a ceramic specimen caused by gravity during heat treatment. It can be defined as deformation or the loss of a shape of a product during its firing. Deformation behaviour of the tiles is related to liquid phases formed during firing or to a reduced viscosity of these phases. In this study, effects of altering $SiO_2//Al_2O_3$ ratio and $Na_2O//K_2O$ ratio of the tile composition on the deformation behaviour of the floor tiles. Correlations between compositional change and deformation behaviour of the tile bodies will be also discussed in this presentation.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 283-284
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Near-Infrared Tunable Reflection and Absorption Using Nanostructured Thin Film Structures Employing Phase-Change Material
    Autorzy:
    Ozdemir, A.
    Kocer, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398701.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    Opis:
    We present the design of a polarization-dependent tunable nanostructured thin film absorber in the near-infrared region. Germanium antimonide tellurite (GST) was employed as the phase change material in the designed structure. Our structure is composed of a periodic grating-type array of 150 nm thick Au buried with 50 nm thick GST layer from the top of the Au layer. The period of the gratings is 2 µm and in each period, GST width is 1 µm. GST was selected as the active phase change material because its optical properties undergo a substantial change during a structural transition from amorphous to crystalline phase. The optical absorption and reflection properties of the designed structure with respect to the geometric and material parameters were systematically investigated using the finite difference time domain computations. It was shown that absorption peak or reflection dip at the resonant wavelengths in the near-infrared region was red shifted from 2039 nm to 2143 nm wavelength by switching the phase change material from its amorphous to crystalline states. The distributions of the electric field and absorbed power at the resonant wavelengths with respect to different phases of the GST were investigated to further explain the physical origin of the absorption. Our study provides a path toward the realization of tunable infrared absorbers for applications, such as selective infrared emitters, infrared camouflage, sensors, and photovoltaic devices.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 464-467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparison for Grain Size Calculation of Cu-Zn Alloys with Genetic Programming and Neural Networks
    Autorzy:
    H. Karahan, İ.
    Özdemir, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402491.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Mh
    81.15.Pq
    Opis:
    Neural Networks (NN) and Genetic Programming (GP) were used as a new method for formulation of grain size of electrodeposited $Cu_{1-x}Zn_x$ alloys as a function of Zinc and Copper content both electrolyte and the alloy films produced by electrodeposition technique. To predict grain size a great number of different expression models genetic programming and neural network were conducted. Each model differs from the other with their linking function, number of genes, head size, and chromosomes. To generate databases for the new grain size formulations, testing and training sets in total of 134 samples were selected at different Zn and Cu ratios of components. 6 different input parameters were selected and the output parameter was grain size of the electrodeposited Cu-Zn alloys. The testing and training sets consisted of randomly selected 106 and 28 for the proposed models. All results in the models indicated an applicable performance for predicting grain size of the alloys and found reliable. The predicted model showed that all of the input parameters effected on the resulting grain size. The NN and GEP based formulation results are compared with experimental results and found to be quite reliable with a very high correlation (R2 = 0.995 for GEP and 0.999 for NN).
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-427-B-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Marine Pollution Caused by Ship Operations with DEMATEL Method
    Autorzy:
    Özdemir, Ü
    Yılmaz, H.
    Başar, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/117112.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine pollution
    decision-making trial and evaluation laboratory (DEMATEL)
    DEMATEL method
    ship operation
    environment protection
    environmental science
    multiple criteria decision-making (MCDM)
    ecology
    Opis:
    Ships have an important role in among the factors causing marine pollution. Marine pollution by ships damages sea life, which effects human health indirectly, in addition it restricts usage of sea for different purposes. Increasing comprehensive and compelling liabilities related with environmental components and subjects day by day are expected results for environmental science and engineering applications according to 60% of our responsibilities of European Union Integration development. In today’s’ world, where global warming is an issue of high priority and makes us feel its impacts in our lives, leaving a livable world to the next generations is now a primary goal for all. Determination of marine pollution caused by ship operations issue is a multiple criteria decision-making (MCDM) problem, and requires MCDM methods to solve it. Therefore, the role of ship factor in maritime pollution and the possible reasons of this argument can be quantitatively evaluated based on expert knowledge and MCDM methodology. To investigate what makes to reduce the first “caused by ship operations " in marine pollution, the decision-making trial and evaluation laboratory (DEMATEL) method approach was applied in this study.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 315-320
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Spinel $Li_4Ti_5O_{12}$ Anode Material by CTAB Assisted Sol-Gel Method
    Autorzy:
    Kiliç Dokan, F.
    Şahan, H.
    Özdemır, B.
    Özdemır, N.
    Patat, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293936.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.ff
    Opis:
    Recently, there has been considerable interest in $Li_4Ti_5O_{12}$ as a potential anode for use in lithium ion batteries. It has many advantages compared to the currently used graphite. It has a good reversibility but no structural change. The material has a theoretical specific capacity of 175 mAh $g^{-1}$. $Li_4Ti_5O_{12}$ powders are usually synthesized by a solid-state reaction of lithium and titanium salts. This method was generally preferred because the synthesis procedures are simple. But there are some disadvantages of solid-state methods such as larger particle size of the products, inhomogeneous distribution, lack of stoichiometry control, etc. These disadvantages can be overcome by sol-gel method. Using surfactant in sol-gel method is easy control on crystal growth and size of the desired products.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 648-649
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turkish Women Seafarers and A Quastionnaire Study on Employment Situation
    Autorzy:
    Yilmaz, H.
    Basar, E.
    Ozdemir, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/117539.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Turkish Women Seafarers
    employment situation
    crew resource management
    seafarers
    Turkish
    maritime profession
    women seafarers
    female seafarers
    gender
    Turkish shipping companies
    ships crew
    Opis:
    Throughout history, women have struggled to gain a place and establish their presence in social life. Mostly, they have continued their life in the position of carrying out family responsibilities. When women want to get involved in the business world, they are facing some problems arising from dogmatic thinking and prejudices, especially among the professions with "male-dominated" judiciary. Maritime profession, one of the oldest professions in the world, was also regarded as a single-gender area until the 20th century. However, in recent years, economical and political changes in the world, equal opportunity in education and incentive works of the International Maritime Organization have led women to work as seafarers. Although female seafarers constitute 2% of the world seafarers, this ratio is higher in developed countries than that of undeveloped or developing countries (URL-1). There is very little information regarding women seafarers in general, including the actual population size. Most of studies focus on passenger ships or cruise ships, not cargo ships (Sohyun, 2010). It is difficult to find relevant studies regarding women seafarers in the world, including in Turkey. In Turkey, women have played an active role and gained an apparent identity in the maritime sector since the 2000s. According to 2015 data, Turkey is ranks the 14th in the world maritime trade with more than 27,6 million deadweight tonnage and manages 1530 vessels (UNCTAD, 2015). In Turkey, many studies related to the employment of seafarers are carried out as in the whole world. However, studies on the employment of women seafarers should be paid more attention. In this study, a questionnaire was carried out with the personnel department managers in Turkish shipping companies. Employment, career, educational status of female seafarers and the general difficulties they face were revealed.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 353-360
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of $TiO_2$ Source on the Electrochemical Performance of $Li_4Ti_5O_{12}$
    Autorzy:
    Kiliç Dokan, F.
    Şahan, H.
    Özdemır, N.
    Özdemır, B.
    Patat, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311661.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.ff
    Opis:
    This study examined the formation mechanism of $Li_4Ti_5O_{12}$ by a ball mill assisted solid-state reaction between $Li_2CO_3$ and $TiO_2$ for applications in lithium ion batteries, also effects of $TiO_2$ source such as rutile type and anatase type on the electrochemical performance of $Li_{4}Ti_5O_{12}$. However, it is believed that the particle properties may depend significantly on the synthesis process and starting materials, which lead to final products with a range of sizes, morphologies, and even phases.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 650-651
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The level of knowledge of, attitude toward and emphasis given to HBV and HCV infections among healthcare professionals: Data from a tertiary hospital in Turkey
    Autorzy:
    Cekin, Ayhan H.
    Cekin, Yesim
    Ozdemir, Aygul
    Powiązania:
    https://bibliotekanauki.pl/articles/2179797.pdf
    Data publikacji:
    2013-03-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    knowledge
    attitude
    HBV infection
    HCV infection
    healthcare workers
    Opis:
    Objectives: To evaluate the level of knowledge of, to investigate the attitudes toward, and to determine the emphasis given to the national prevalence of HBV/HCV infections among healthcare professionals. Materials and Methods: A total of 206 healthcare professionals (mean (SD) age: 37.0 (6.3) years; 86.9% – females) including medical laboratory technicians (N = 54) and nurses (N = 152) employed in the Antalya Training and Research Hospital, Antalya, Turkey. Laboratory (N = 53), operating room (N = 41) and in-patient clinic (N = 112) staff were included in this descriptive study. A 33-questionnaire composed of questions related to their level of knowledge and attitudes toward HBV/HCV infections, the sources of their knowledge of HBV/HCV infections and the emphasis given to the national and global importance of the diseases was administered via a face–to-face interview method with each subject; participation was volunteer based. Results: The participants working in the in-patient clinic (18.0 (3.2)) had the highest mean (SD) knowledge level compared to the laboratory (16.4 (3.1), p < 0.05) and operating room (17.0 (2.8), p < 0.05) staff. The participants from the in-patient clinic (44.6%) had a more advanced level of knowledge compared to the participants working in the laboratory (27.8%, p < 0.05) and the operating room (30.0%, p < 0.05). Most of the subjects (60.7%) had education concerning HBV/HCV infections in the past. There was no signifi cant difference between the hospital units in terms of the attitudes of healthcare workers (HCWs) toward HBV/HCV infections and the level of education concerning them. Conclusions: Our fi ndings revealed a moderate level of knowledge in most HCWs, regardless of their exposure to risk. While the highest knowledge scores and vaccination rates were noted among the in-patient clinic staff, there was no signifi cant difference between the hospital units in terms of the attitudes of HCWs towards a patient or a colleague with an HBV/HCV infection.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2013, 26, 1; 122-131
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Behavior of in-Situ AlB₂/Al-Cu Metal Matrix Composite
    Autorzy:
    Elcicek, H.
    Savaş, Ö.
    Aydin, Z.
    Özdemir, O.
    Kayikci, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398744.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    Opis:
    The aim of this study was to fabricate 30 wt.% AlB₂/Al-Cu composites using in-situ casting processes and to investigate the corrosion behavior of the composites and of the matrix material in various media. The electrochemical parameters were obtained from potentiodynamic polarization curves. The composites were prepared by liquid reaction of aluminum matrix with boron oxide at 1400°C. The results show that the corrosion resistance of the composite was higher than that of the matrix in selected corrosion media. The anodic corrosion current density values were decreased by reinforcing AlB₂ particles.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 661-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Frequency C-V and G-V Characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/n-GaAs Schottky Barrier Diodes
    Autorzy:
    Özdemir, A.
    Akcan, D.
    Lapa, H.
    Yavuz, A.
    Duman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402507.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.30.+y
    Opis:
    The frequency-dependent electrical characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/ n-GaAs Schottky barrier diodes have been investigated by using capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements at room temperature. Negative capacitance behavior has been observed in the C-V characteristic for each frequency. The magnitude of absolute value of C was found to increase with decreasing frequency in the forward bias region. The value of G/ω increases with decreasing frequency in the positive region. This can be attributed to the increase in the polarization at low frequencies and to the fact that more carriers are introduced into the structures. Negative capacitance phenomenon can be explained by the loss of interface charges from the occupied states below the Fermi level, caused by impact ionization process. According to obtained result, the values of C and G/ω are strong functions of frequency and applied bias voltage, particularly in the accumulation an inversion region. Doping concentration $(N_{d})$, diffusion potential $(V_{d})$, Fermi energy level $(E_{f})$, and barrier height $(Φ_{b}(C-V))$ values have been calculated from reverse bias $C^{-2}-V$ plots for 3 MHz. Finally, the obtained value of $R_{s}$ in the accumulation region increases with decreasing frequency.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-450-B-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The antimicrobial and antioxidant activities of extracts obtained from some moss species in Turkey
    Aktywność przeciwdrobnoustrojowa i przeciwutleniająca wyciagów z wybranych gatunków mchów rosnących w Turcji
    Autorzy:
    Erturk, O.
    Sahin, H.
    Erturk, E.Y.
    Hotaman, H.E.
    Koz, B.
    Ozdemir, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/72224.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Opis:
    Pharmaceutical industry is forced to develop new pharmacologically active molecules. Like other plants, mosses are considered to be potential source of new biologically active compounds. The present study was designed to evaluate the The antimicrobial and antioxidant activities of extracts obtained from some moss species in Turkey antimicrobial and antioxidant activity of 8 moss species: Hypnum cupressiforme, Homalothecium sericeum, Thuidium delicatulum, Homalothecium lutescens, Homalothecium nitens, Leucodon sciuroides, Ctenidium molluscum, and Eurhynchium striatulum obtained from Turkey. Methods: The antimicrobial activity of extracts was investigated against four Gram (+) and six Gram (–) bacterial strains and three tested fungi. Total phenolic content (TPC), cupric reducing antioxidant capacity (CUPRAC), ferric reducing antioxidant power (FRAP), and DPPH radical scavenging activity assays were applied to determine the antioxidant activity. All moss extacts were found to be active against all the organisms except Homalothecium nitens. Especially, H. sericeum and E. striatulum showed the best antioxidant activity. The obtained results show that mosses may be used as possible natural antioxidant, antimicrobial agents to control various human, animal and plant diseases.
    Przemysł farmaceutyczny wciąż poszukuje nowych związków aktywnych. Podobnie jak inne rośliny, również mchy uważa się za potencjalne źródło nowych związków biologicznie czynnych. Przedstawione badania miały na celu określenie aktywności przeciwdrobnoustrojowej i przeciwutleniającej ośmiu gatunków mchów rosnących w Turcji: Hypnum cupressiforme, Homalothecium sericeum, Thuidium delicatulum, Homalothecium lutescens, Homalothecium nitens, Leucodon sciuroides, Ctenidium molluscum i Eurhynchium striatulum. Działanie przeciwdrobnoustrojowe wyciągów badano w stosunku do czterech szczepów bakterii Gram (+) i sześciu Gram (–) oraz w stosunku do trzech gatunków grzybów. Działanie przeciwutleniające badano oznaczając sumę zawartości związków fenolowych (TPC), zdolność redukowania miedzi (CUPRAC), zdolność redukowania jonów żelaza (FRAP) i oznaczając działanie przeciwutleniające z użyciem rodnika DPPH . Wszystkie badane wyciągi z mchów (za wyjątkiem Homalothecium nitens) wykazywały aktywność przeciwdrobnoustrojową w stosunku do testowanych mikroorganizmów. Najsilniejsze działanie przeciwutleniające wykazały wyciągi z H. sericeum i E. striatulum. Otrzymane wyniki wskazują, że można traktować mchy jako potencjalne naturalne źródła substancji antyoksydacyjnych i przeciwdrobnoustrojowych do zwalczania chorób ludzi, zwierząt i roślin.
    Źródło:
    Herba Polonica; 2015, 61, 4
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of dexamethasone and minocycline alone and combined with N-acetylcysteine and vitamin E on serum matrix metalloproteinase-9 and coenzyme Q10 levels in aflatoxin B1 administered rats
    Autorzy:
    Tras, B.
    Eser Faki, H.
    Ozdemir Kutahya, Z.
    Bahcivan, E.
    Dik, B.
    Uney, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539322.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    aflatoxin B1
    coenzyme Q10
    matrix metalloproteinase-9
    rat
    treatment
    Opis:
    This study aimed to determine the effects of dexamethasone and minocycline alone and combined treatment with N-acetylcysteine (NAC) and vitamin E on serum coenzyme Q10 (CoQ10) and matrix metalloproteinase-9 (MMP-9) levels in rats administered aflatoxin B1 (AFB1). The study was carried out on 66 male Wistar rats. Following the intraperitoneal (IP) administration of AFB1 at dose of 2 mg/kg, minocycline (45 and 90 mg/kg, IP) and dexamethasone (5 and 20 mg/kg, IP) were administered alone and combined with NAC (200 mg/kg, IP) and vitamin E (600 mg/kg, IP). CoQ10 and MMP-9 levels were analyzed using the HPLC-UV method and a commercial kit by ELISA, respectively. AFB1 increased MMP-9 level and decreased CoQ10 level compared to the control group. After dexamethasone and minocycline administration, there is no increase in CoQ10 level, which is caused by AFB1. However, dexamethasone and minocycline combined with NAC+vitamin E caused significant increases in CoQ10 levels. Dexamethasone and minocycline alone and combined with NAC+vitamin E decreased MMP-9 levels compared to the single AFB1 treated group. The use of MMPs inhibitors and oxidative stress-reducing agents is anticipated to be beneficial in the poisoning with AFB1.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 419-427
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved flotation of heat treated lignite with saline solutions containing mono and multivalent ions
    Autorzy:
    Ozdemir, O.
    Ersoy, O. F.
    Guven, O.
    Turgut, H.
    Cinar, M.
    Çelik, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109640.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    heat treatment
    lignite
    DLVO
    Saline Solutions
    Opis:
    Flotation of lignites is inherently difficult. However, pre-heat treatment of coal is also known to make coal surfaces more hydrophobic possibly through removal of water entrapped in the structure of coal. In this context, the objective of this study was, therefore, to determine changes in the hydrophobicity of some lignites under moderately controlled heat treatment and correlate the flotation response of lignites in different salt solutions of NaCl, KCl, CaCl2, and MgCl2 without using any reagent. The results of flotation tests suggested that under the present test conditions, it was possible to float thermally pre-treated lignite samples of partially hydrophobic character in salt solutions in the absence of collector and frother. In addition, the effect of heat treatment on hydrophobicity, and in turn flotation was explained by a theoretical model based on extended DLVO interactions to quantify the effects of both heat treatment and salt concentration on bubble-particle interactions. The results of theoretical modeling suggested that the removal of hydrogen containing groups from coal surfaces significantly contribute to the electrical double layer and hydrophobic forces that govern the magnitude of energetic barrier and also the extent of bubble-particle attachment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1070-1082
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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