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    Wyświetlanie 1-21 z 21
    Tytuł:
    Uptake of phenol from aqueous solution by burned water hyacinth
    Autorzy:
    Uddin, M.T.
    Islam, M.S.
    Islam, M.A.
    Abedin, M.Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/779654.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fenol
    adsorpcja
    równowaga
    kinetyka adsorpcji
    phenol
    adsorption
    burned water hyacinth
    equilibrium
    adsorption kinetics
    Opis:
    The potential of burned water hyacinth (BWH) for phenol adsorption from aqueous solution was studied. Batch kinetic and isotherm studies were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dosage and pH. The pH at the point of zero charge (pH(PZC)) of the adsorbent was determined by the titration method and the value of 8.8 š 0.2 was obtained. The FTIR of the adsorbent was carried out in order to find the potential adsorption sites for the interaction with phenol molecules. The Freundlich and Langmuir adsorption models were used for the mathematical description of adsorption equilibrium and it was found that the experimental data fitted very well to the Langmuir model. Maximum adsorption capacity of the adsorbent was found to be 30.49 mg/g. Batch adsorption models, based on the assumption of the pseudo-first-order and pseudo-second-order models, were applied to examine the kinetics of the adsorption. The results showed that kinetic data closely followed the pseudo-second-order model.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 2; 43-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Responses of maize varieties to salt stress in relation to germination and seedling growth
    Autorzy:
    Hassan, N.
    Hasan, Md.K.
    Shaddam, Md.O.
    Islam, M.S.
    Barutcular, C.
    EL Sabagh, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11757.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2018, 69
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An effective medium ratio obeying meta-atom for multiband applications
    Autorzy:
    Hossain, M. J.
    Faruque, M. R. I.
    Islam, M. T.
    Islam, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201192.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compact
    effective medium ratio
    meta-atom
    multiband
    kompakt
    średni wskaźnik efektywności
    Opis:
    In this paper, an effective medium ratio obeying, negative refractive index, compact meta-atom was designed, manufactured and tested for operation in a multiband microwave regime. The proposed meta-atom structure obeyed better effective medium ratio. The results of the measurement were verified by the commercially available Computer Simulation Technology (CST) Studio Suite 2014 simulator. The effective medium ratio obeying meta-atom displayed multiband response, in conjunction with negative refractive index property over a certain frequency band in the microwave frequency span. Furthermore, a few parametric analyses were completed with the meta-atom, and the effective medium parameters were investigated. The sizes and complex scattering constitutive parameters of the proposed negative refractive index, compact meta-atom are applicable for multiband applications in microwave regime.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 139-147
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial Activities of Some Transition Metal Schiff Base Complexes
    Autorzy:
    Islam, M.N.
    Shahriar, S.M.S.
    Islam, M.K.
    Jesmin, M.
    Ali, M.M.
    Khanam, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411780.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    antibacterial activity
    Schiff base transition metal complexes
    minimum inhibitory concentration
    Brine shrimp lethality
    Opis:
    A new series of four transition metal complexes of a Schiff base derived from salicylaldehyde and glycine, viz. [N-salicylidene glycinato diaqua cobalt (II) dimer] (SGCo)2, [N- salicylideneglycinato-di-aqua-nickel(ll)dimer] (SGN)2, [N-salicylideneglycinato-aqua-copper(II)] (SGC) and [N-salicylidene glycinato diaqua zinc(II) dimer] (SGZ)2 have been synthesized and characterized through a rapid, simple, and efficient methodology in excellent yield. These compounds were screened for in vitro antibacterial activities against six pathogenic bacteria, such as Shigella sonnei, Escherichia coli, Bacilus subtilis, Sarcina lutea, Staphylococcus aureus and Pseudomonas arioginosa. The antibacterial activity was determined by the disc diffusion method using DMSO as solvent. The results indicate that (SGC) compound exhibit a significant antibacterial activity, depending on the bacterial strain and (SGCo)2, (SGN)2 and (SGZ)2 compounds show a moderate sensitivity even with higher doses. All these compounds were found to possess cytotoxic effect.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 5; 12-20
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Erbium-doped fiber ring laser dynamical analysis for chaos message masking scheme
    Autorzy:
    Ali, S. Z.
    Islam, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/173276.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    erbium-doped fiber ring laser chaos
    optical chaos
    chaos message masking
    Lyapunov exponent
    secure optical communication
    Opis:
    A detailed dynamical analysis of erbium-doped fiber ring laser cavity loss configuration for the chaos message masking scheme is carried out to optimize the generation of high quality chaos. A threefold increase in Lyapunov exponent implying higher security, and a significant increase in chaos bandwidth is achieved, both ideal for secure optical communication and nonlinear chaotic applications. The pulsed chaos is chaotic in a pulse time interval in addition to the amplitude resulting in better concealment of data pulses in a time domain. The chaos spectrum is a flat broadband and rich in spikes making spectral detection of a message more difficult. The range of five key parameters for which erbium-doped fiber ring laser retains its chaotic behaviour is also increased significantly reducing the effectiveness of a brute force attack to guess the erbium-doped fiber ring laser parameters. The chaos message masking scheme provides a higher security in comparison with additive chaos modulation scheme for implementation of chaotic optical communication using erbium- doped fiber ring laser. The security of a complete end-to-end chaotic optical communication system is tested by launching a spectral attack to estimate the message signal. The message signal clearly hides in a stronger chaotic signal and its spectral contents are not discernible.
    Źródło:
    Optica Applicata; 2017, 47, 3; 395-410
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analgesic and anti-inflammatory activities of some transition metal schiff base complexes
    Autorzy:
    Jesmin, M.
    Islam, M. K.
    Ali, S. M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411762.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Analgesic activity
    Anti-inflammatory activity
    Schiff bases complexes
    Writhing test
    Opis:
    Analgesic and anti-inflammatory activities of four transition metal complexes of a Schiff base derived from salicylaldehyde and glycine, viz. [N-salicylideneglycinato diaqua cobalt(II) dimer] (SGCo)2, [N-salicylideneglycinato-di-aqua-nickel(ll)dimer] (SGN)2, [N-salicylideneglycinato-aqua-copper(II)] (SGC) and [N-salicylideneglycinato diaqua zinc(II) dimer] (SGZ)2 were studied in swiss albino mice. 10 mg/kg (p.o) dose for each compound were selected throughout the research work. The analgesic activity was determined by acetic acid induced writhing and tail immersion methods. All such data were compared with standard drugs at the dose of 10 mg/kg (p.o. The anti-inflammatory activity of the test compounds was determined by the carragenan induced mice paw edema inhibition method.). Analgesic and anti-inflammatory activities of the test compounds at 10 mg/kg (p.o.) were quite comparable to those of standard drugs at 10 mg/kg (p.o.). All these compounds can be considered as potent analgesic and anti-inflammatory agents.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 8; 64-72
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trichodina johniusi sp. n. (Ciliophora: Trichodinidae) from Johnius coitor (Hamilton, 1822) in the Shitalakshya River, Bangladesh
    Autorzy:
    Kibria, M.M.
    Islam, H.
    Asmat, G.S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/838227.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    Trichodina johniusi
    new species
    Ciliophora
    Trichodinidae
    Johnius coitor
    Shitalakshya River
    Bangladesh
    fish
    ectoparasite
    parasite
    Źródło:
    Annals of Parasitology; 2011, 57, 4
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Conduction Analysis of a Hollow Sphere made of Three Different Layers of Materials
    Autorzy:
    Khan, S. M. Khaled
    Islam, Md. Mashrur
    Powiązania:
    https://bibliotekanauki.pl/articles/1062861.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Heat transfer
    Material Science
    Naiver-Strokes
    Spherical Contour
    Opis:
    A systematic arrangement has been gotten for the transient issue of three-dimensional multilayer heat conduction in a circle with layers in the spiral course. The arrangement strategy can be connected to an empty circle or a strong circle made out of a few layers of different materials. By and large, the partition of factors connected to 3D round directions has interesting attributes because of the nearness of related Legendre works as the eigenfunctions. Additionally, an eigenvalue issues the azimuthal way likewise requires arrangement; once more, its properties are one of a kind inferable from periodicity the azimuthal way. In this way, broadening existing arrangements in 2D round directions to 3D circular directions isn't clear. In a round facilitate framework, one can explain a 3D transient multilayer heat conduction issue without the nearness of fanciful eigenvalues. A 2D tube shaped polar facilitate framework is the main other case in which such multidimensional issues can be tackled without the utilization of nonexistent eigenvalues. The nonappearance of nonexistent eigenvalues renders the arrangement philosophy fundamentally increasingly valuable for pragmatic applications. The strategy portrayed can be utilized for all the three kinds of limit conditions in the external and inward surfaces of the circle. The arrangement method is shown on an illustrative issue for which results are gotten.
    Źródło:
    World Scientific News; 2019, 127, 3; 248-259
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of different intensities of cold stress on certain physiological phenomena related to skeletal health in a hypogonadal rat model
    Autorzy:
    Islam, M.N.
    Chanda, S.
    Mitra, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/69914.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    skeletal change
    bone turnover
    mineral content
    bone density
    body mass
    rat
    cold stress
    bone ash
    calcium
    estrogen
    ovariectomy
    bone metabolism
    osteoporosis
    skeletal health
    hormone
    Źródło:
    Journal of Physiology and Pharmacology; 2000, 51, 4,2
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trichodina johniusi sp. n. (Ciliophora: Trichodinidae) from Johnius coitor (Hamilton, 1822) in the Shitalakshya River, Bangladesh
    Autorzy:
    Kibria, M.M.
    Islam, H.
    Asmat, G.S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2143266.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    Trichodina johniusi
    new species
    Ciliophora
    Trichodinidae
    Johnius coitor
    Shitalakshya River
    Bangladesh
    fish
    ectoparasite
    parasite
    Opis:
    During a survey on species diversity of trichodinid ciliates from freshwater fishes in the Shitalakshya River of Gazipur district, Bangladesh, a new species of ciliate was identified and described using the silver nitrate impregnation method. The species is described from the gills of Johnius coitor in the Shitalakshya River of Gazipur district. Trichodina johniusi sp. n. may be characterised by having broad, rounded and slightly curved blades with shallow semilunar curve; relatively short, slim rays having parallel borders, but ill defined ray apophysis; ray tip never touches a well defined, undivided central circle, encircled by undulated perimeter, interspersed with black patches or granules; and the adoral cilia described a turn of approximately 400°. Based on these characters and the unique shape and absence of variability of the denticles among the silver impregnated specimens of the present species, it may be said that to a lesser extent, resembles T. domerguei.
    Źródło:
    Wiadomości Parazytologiczne; 2011, 57, 4; 265-270
    0043-5163
    Pojawia się w:
    Wiadomości Parazytologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide
    Autorzy:
    Ali, S.
    Ahmed, N.
    Alwee, S.
    Islam, M.
    Rana, S.
    Bhuiyan, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/227154.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porous core waveguide
    THz waveguide
    flat EML
    hybrid design
    flat dispersion
    triangular design
    core rotation
    Opis:
    In this paper, we investigate the effects for rotating the triangular core air hole arrangements of a hybrid design porous core fiber. The triangular core has been rotated in anticlockwise direction to evaluate the impact on different waveguide properties. Effective Material Loss (EML), confinement loss, bending loss, dispersion characteristics and fraction of power flow are calculated to determine the impacts for rotating the triangular core. The porous fiber represented here has a hybrid design in the core area which includes circular rings with central triangular air hole arrangement. The cladding of the investigated fiber has a hexagonal array of air hole distribution. For optimum parameters the reported hybrid porous core fiber shows a flat EML of ±0.000416 cm⁻¹ from 1.5 to 5 terahertz (THz) range and a near zero dispersion of 0.4±0.042 ps/THz/cm from 1.25 to 5.0 THz. Negligible confinement and bending losses are reported for this new type of hybrid porous core design. With improved concept of air hole distribution and exceptional waveguide properties, the reported porous core fiber can be considered as a vital forwarding step in this field of research.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 25-31
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunogenicity of recombinant bacterial antigens expressed as fusion proteins in transgenic rice seeds
    Autorzy:
    Zaman, S.
    Islam, S.M.T.
    Khan, M.K.
    Alam, M.M.
    Uddin, M.I.
    Baby, N.I.
    Islam, S.
    Bhuiyan, T.R.
    Qadri, F.
    Seraj, Z.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/80383.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rice seed
    transgenic rice plant
    gene sequence
    fusion protein
    tuberculosis
    vaccine
    oral vaccine
    Ag85B antigen
    cholera
    bacterial antigen
    immunogenicity
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Significant Influence of Annealing Temperature and Thickness of Electrode on Energy Conversion Efficiency of Dye Sensitized Solar Cell: Effect of Catalyst
    Autorzy:
    Uddin, J.
    Islam, J. M. M.
    Khan, S. M. M.
    Hoque, E.
    Khan, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412298.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dye Sensitized Solar Cell
    sensitizer
    catalyst
    annealing temperature
    thickness
    Opis:
    Dye sensitized solar cell (DSSC) shows great promise as an alternative to conventional p-n junction solar cells due to their low fabrication cost and reasonably high efficiency. DSSC was assembled by using natural dye extracted from red amaranth (Amaranthus Gangeticus) as a sensitizer and different catalysts for counter electrode were applied for maximum energy conversion efficiency. Annealing temperature and thickness of electrode were also investigated and optimized. Catalyst, annealing temperature and thickness were optimized by the determination of cell performance considering photoelectrochemical output and measuring current and voltage; then calculating efficiency and other electrical parameters. The experimental results indicated that samples having 40 μm electrode thickness and prepared at 450 o C annealing temperature showed the best performance.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 78-87
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma radiation treated chitosan solution for strawberry preservation: Physico-chemical properties and sensory evaluation
    Autorzy:
    Jesmin, S.
    Al-Jubayer, A.
    bin Eusuf, S.
    Kamal, A.H.M.
    Islam, J.M.M.
    Ferdoush, F.
    Kabir, S.E.
    Khan, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11054.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2016, 60
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Properties of Carbon Nanotube (CNT) Reinforced Polyvinyl Alcohol (PVA) Composites
    Autorzy:
    Hasan, M.
    Das, S. K.
    Islam, J. M. M.
    Gafur, Md. A.
    Hoque, E
    Khan, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411675.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CNT
    PVA
    composite
    Thermal properties
    Gum acacia
    Opis:
    Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10 % by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10 % CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 12; 59-66
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An alternative and indirect statistical modeling method for viscosity estimation and its experimental validation for low styrene content polyester resin
    Autorzy:
    Nawaz, A.
    Islam, B.
    Ijaz, M. Z.
    Saleem, U.
    Khattak, M. S.
    Ahmad, S. N.
    Maqsood, N.
    Ali, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/778495.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    indirect method
    polyester resin
    statistical relation
    Ford viscosity cup
    Opis:
    We propose an indirect method of ASTM D-1200 for measurement of viscosity from 0.1 to 30 stokes (St) using Ford cup 5 (range 2~ 12 St) by developing a statistical relation. General purpose low styrene content polyester resin (without adding initiator, hardener and accelerator) was used for viscosity measurement. In existing ASTM D 1200 standard, ford cups (1-4) are used to measure the viscosity up to 2 St, while fifth cup is used for measurement from 2 to 12 St. Viscosity above 12 St is not estimated using existing ASTM D- 1200 method. In contrast, our method and statistical relation proposed in this paper estimates viscosity in the flexible range of 0.1 to 30 St by using Ford cup 5 only. The estimated values were confirmed by existing ASTM D-1200 (0.1 to 12 St) and by using Ubbelohde viscometer (12 to 30 St). Values estimated above 12 St are from the proposed model are also in good conformance (percentage error ~ 5% or less) with experimental results. The satisfaction level of the estimated values with the experiments suggests that the model has also the potential for application to paints, polymer and oil industry.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 60-65
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan biopolymer improves the fruit quality of litchi (Litchi chinensis Sonn.)
    Biopolimer chitozan poprawia jakość owoców liczi (Litchi chinensis Sonn.)
    Autorzy:
    Mehebub, Md.S.
    Mahmud, N.U.
    Rahman, M.
    Surovy, M.Z.
    Gupta, D.R.
    Hasanuzzaman, M.
    Islam, M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/26717.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Chitosan (CHT) is a natural compound that has been used to control postharvest pathogenic diseases due to its capability of eliciting natural defense responses in plants. The aim of this study was to investigate the effect of foliar CHT application on yield and quality of the litchi fruit. Chitosan was applied by spraying on to fruit and foliage just after fruit set four times at 7-day intervals with four varying doses viz. 100, 250, 500, and 1,000 µg L−1 and a control (0 µg L−1). Although the application of CHT had no significant effect on the size of the fruits (length and width), the total contents of phenolics, flavonoids, and ascorbic acid and the antioxidant activity of litchi fruit arils were significantly increased in CHT-treated fruit compared with the untreated control. The highest phenolic, flavonoid, and ascorbic acid contents were 334 µg gallic acid g−1, 881 μg quercetin g−1, and 178 µg g−1, respectively, in fruits treated with 500 µg L−1 CHT. However, the highest antioxidant activity (622 μg butylated hydroxytoluene g−1) was recorded in 250 µg L−1 CHT-treated fruits. Our findings revealed that the application of low doses of CHT in a litchi orchard might improve fruit quality by increasing the content of antioxidants and antioxidant activities.
    Chitozan (CHT) jest naturalnym związkiem wykorzystywanym do zwalczania chorób roślin, ponieważ wykazuje potencjał do wywoływania naturalnej odpowiedzi obronnej w roślinach. Celem niniejszych badań było określenie wpływu dolistnego aplikowania CHT na plonowanie i jakość owoców liczi. Chitozan w stężeniu: 0 (kontrola), 100, 250, 500 lub 1000 μg L−1 rozpylano na owoce i liście bezpośrednio po pojawieniu się owoców czterokrotnie w odstępach 7-dnio-wych. Mimo, że aplikacja CHT nie miała istotnego wpływu na wielkość owoców (długość i szerokość), całkowita zawartość związków fenolowych, flawonoidów i kwasu askorbiowego, jak również aktywność antyoksydacyjna owoców liczi wyraźnie wzrosła po zastosowaniu CHT w porównaniu do owoców nie poddanych działaniu tego związku. Najwyższe stężenia związków fenolowych, flawonoidów i kwasu askorbinowego, wynoszące odpowiednio: ekwiwalent 334 μg kwasu galusowego g−1 , ekwiwalent 881 μg kwercytyny g−1 i 178 μg g−1, stwierdzono w owocach traktowanych 500 μg L−1 CHT. Jednak najwyższą aktywność antyrodnikową (622 μg butylohy-droksytoluenu g−1) stwierdzono w owocach traktowanych 250 μg L−1 CHT. Uzyskane wyniki wskazują, że zastosowanie niskich stężeń CHT w sadach liczi może poprawić jakość owoców poprzez zwiększenie w nich zawartości antyoksydantów oraz aktywności antyrodnikowej.
    Źródło:
    Acta Agrobotanica; 2019, 72, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications
    Autorzy:
    Das, S K.
    Islam, J. M. M.
    Hasan, M.
    Kabir, H.
    Gafur, Md. A.
    Hoque, E.
    Khan, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412543.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Conductive thin film
    Composite
    TiO2
    Solar cell
    Optoelectronics
    Sodium alginate
    Opis:
    Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6 % sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6 % sand containing composite film are found to be 4.445 MPa, 9.76 %, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6 % sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 90-101
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does melatonin improve the yield attributes of field-droughted banana under Egyptian semi-arid conditions?
    Autorzy:
    Hassan, Islam F.
    Gaballah, Maybelle S.
    Ogbaga, Chukwuma C.
    Murad, Soha A.
    Brysiewicz, Adam
    Bakr, Basem M.M.
    Mira, Amany
    Alam-Eldein, Shamel M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073748.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    banana
    deficit irrigation
    evapotranspiration
    melatonin
    photosynthesis
    Opis:
    Drought is regarded as one of the environmental constraints threatening agriculture worldwide. Melatonin is a pleiotropic molecule prevalent in plants capable of promoting plant endogenous resilience to many environmental challenges including drought. Banana is an important staple food consumed in developing countries especially in Africa. In this research, we studied the role of melatonin in the growth of bananas subjected to drought under the Egyptian semi-arid conditions. To achieve this objective, a field experiment on banana (Musa spp., cv. Williams) mother plants and first ratoon was conducted on a private farm for two seasons - 2019 and 2020. Three irrigation treatments, 100, 90 and 80% irrigation water requirements (IWR) were used in conjunction with four concentrations of melatonin as a foliar spray (0 μmol, 40 μmol, 60 μmol, and 80 μmol) to determine the effect of both treatments on banana plant performance under drought. The results showed that there was a substantial difference between treatments, with the foliar application of melatonin at 80 μmol concentration improving most of the yield attributes, relative water content, total chlorophyll and proline with water deficit. However, the foliar application of the molecule lowered the biochemical characteristics mostly at 80% IWR under the Egyptian semi-arid conditions. Overall, there was a concentration-dependent response with regards to IWR for the two seasons 2019 and 2020.
    Źródło:
    Journal of Water and Land Development; 2022, 52; 221--231
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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