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Wyświetlanie 1-15 z 7384
Tytuł:
Chemical composition, volatiles, and antioxidant activity of Rosa iberica Stev. hips
Skład chemiczny, związki lotne oraz działanie antyoksydacyjne owoców Rosa iberica Stev. hips
Autorzy:
Abaci, Z.T.
Zarifikhosroshahi, M.
Kafkas, E.
Sevindik, E.
Powiązania:
https://bibliotekanauki.pl/articles/11543361.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Rosehip fruits have been known to contain significant amounts of bioactive compounds. These bioactive compounds positively affect human health due to their antioxidant activities. This study aimed to analyze the total phenolic content (TPC) and total anthocyanin content (TAC), organic acids, total soluble solids (TSS), sugars, total dry matter (TDM), Lascorbic acid content (AAC), total antioxidant capacity and volatile components present in R. iberica Stev. hips using spectrophotometry, high performance liquid chromatography (HPLC) and Headspace and Immersion Solid Phase Micro Extraction gas chromatography-mass spectrometry (HS and Im-GC/MS). TSS, TDM, AAC, acidity, TAC and TPC were found to be 27, 44.6%, 503.26 mg·100 g-1 frozen weight (FW), 2%, 2.50 mg · 100 g-1 FW, 2832.3 mg · 100 g-1 FW, respectively. The major acids detected in R. iberica Stev. hips were citric acid (0.62 g · 100 g-1 FW) and malic acid (0.49 g · 100 g-1 FW) other detected acids included succinic acid (0.012 g · 100 g-1 FW) and fumaric acid (0.016 g · 100 g-1 FW). Total sugar content was 26.74 g · 100 g-1 FW, and glucose was the major sugar (9.35 g. · 100 g-1 FW), followed by fructose (8.58 g g · 100 g-1 FW), sorbitol (8.32 g · 100 g-1 FW), and very low quantities of sucrose (0.49 g · 100 g-1 FW). Twenty-five volatile components were identified using HS-GC/MS, and the major volatiles were 2,4-bis (1,1-dimethylethyl) phenol (20.35%), naphthalene (18.72%), ethanol (16.59%), nonanal (6.23%), acetic acid (4.39%), 2-propanone, 1-hydroxy (2.53%). Twenty-three volatile components of Rosa hips have been detected for the first time in this study. Twenty-eight components were identified by Im-GC/MS; however, fifteen of these components were determined to be different from those identified using HS-GC/MS. The FRAP value of hips was 38.55 mmol TE · g-1 FW and the ABTS value was 47.75 mmol TE · g1 FW.
Owoce dzikiej róży zawierają znaczne ilości związków bioaktywnych. Związki te pozytywnie wpływają na zdrowie człowieka ze względu na swe działanie antyoksydacyjne. Celem niniejszego badania była analiza całkowitej zawartości związków fenolowych (TPC) oraz całkowitej zawartości antocyjanów (TAC), kwasów organicznych, całkowitej zwartości rozpuszczalnych substancji stałych (TSS), cukrów, całkowitej suchej masy (TDM), zwartości kwasu askorbinowego (AAC), całkowitej zdolności antyoksydacyjnej oraz składników lotnych obecnych w R. iberica Stev. przy użyciu spektrofotometrii, wysokosprawnej chromatografii cieczowej (HPLC) oraz chromatografii HS i Im-GC/MS. Stwierdzono, że TSS, TDM, AAC, kwasowość, TAC oraz TPC wynosiły odpowiednio 27,44.6%, 503,26 mg·100 g-1 masy zamrożonej (FW), 2%, 2,50 mg·100 g-1 FW, 2832,3 mg·100 g-1 FW. Główne kwasy wykryte w R. iberica Stev. to kwas cytrynowy (0,62 g·100 g-1 FW) i kwas jabłkowy (0,49 g·100 g-1 FW), natomiast inne wykryte kwasy to kwas bursztynowy (0,012 g·100 g-1 FW) i kwas fumarowy (0,016 g·100 g-1 FW). Całkowita zawartość cukrów wynosiła 26,74 g·100 g-1 FW. Glukoza była głównym cukrem (9,35 g·100 g-1 FW), następnie fruktoza (8,58 g·100 g-1 FW), sorbitol (8,32 g·100 g-1 FW) oraz bardzo niskie ilości sacharozy (0,49 g·100 g-1 FW). Zidentyfikowano 25 związków lotnych przy użyciu HS-GC/MS. Główne związki lotne to 2,4 (1,1-dimetyloetyl) fenol (20,35%), naftalen (18,72%), etanol (16,59%), nonanal (6,23%), kwas cytrynowy (4,39%), 1-hydroksy, 2-propanon (2,53%). Po raz pierwszy w niniejszym badaniu wykryto owocach dzikiej róży 23 związki lotne. 28 związków zidentyfikowano za pomocą Im-GC/MS. Jednak 15 z tych związków określono jako inne od tych, które zidentyfikowano za pomocą HS-GC/MS. Wartość FRAP owoców wynosiła 38,55 mmol TE·g-1 FW natomiast wartość ABTS 47,75 mmol TE·g-1 FW.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 1; 41-54
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of aluminum addition to Nb-Al-C-N coatings on AISI M2 steel obtained by thermo-reactive deposition technique
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1061918.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
81.40.Ef
62.20.Qp
81.05.-t
Opis:
In this study, aluminum-doped (1 and 2 wt.%) and Al-free niobium carbo-nitride coatings were applied to the surface of AISI M2 high speed steel using the process of thermo-reactive deposition technique (TRD) at 1000°C during 1-4 h. The obtained coatings were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) analysis and micro hardness test. Nb-Al-C-N layers were compact and homogeneous. X-ray diffraction analysis has shown that the major phases formed in the coating layer are Nb₂CN and NbN. The depth of the coating layer had increased with the treatment time and ranged from 6.65 to 9.05 μm. The measured values of the hardness of the coating layers were ranging between 2136 and 2636 HK_{0.005}.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 653-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption of Cd(II), Ni(II) and Zn(II) on natural, sodium-, and acid-modified clinoptilolite-rich tuff
Autorzy:
Abatal, M.
Olguin, M. T.
Abdellaoui, Y.
El Bouari, A.
Powiązania:
https://bibliotekanauki.pl/articles/208078.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
clinoptilolite
cadmium removal
metale ciężkie
klinoptylolit
usuwanie kadmu
Opis:
Sorption of Cd2+, Ni2+and Zn2+ions on natural (ZPCli), sodium modified (ZPCliNa) and acid modified (ZPCliH) zeolites have been investigated in function of the contact time, pH, and metal concentration by the batch technique. The characterization of ZPCIi, ZPCliNa, and ZPCliH materials was performed using X-ray powder diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy techniques. The surface area (BET) and the pHpzcwere also determined. The pH in the point of the zero charge of ZPCli, ZPCliNa, and ZPCliH zeolites was 8.25, 8.00, and 2.05, respectively. The kinetic sorption data for ZPCli, ZPCliNa and ZPCliH were well fitted to the pseudo-second order model (R2> 0.99). The linear model described the Cd, Ni and Zn sorption isotherms for ZPCliH, while for ZPCliNa and ZPCliH it was the Freundlich model. The unmodified and modified zeolitic materials showed the highest sorption capacity for Cd2+, lower for Zn2+ and Ni2+.
Źródło:
Environment Protection Engineering; 2018, 44, 1; 41-59
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the effect of zinc oxide nanoparticles and extract of Acorus calamus applied topically on surgical wounds inflicted on the skin of rabbits
Autorzy:
Abbas, A.
Muhammad, S.A.
Ashar, A.
Mehfooz, S.A.
Rauf, A.
Bakhsh, M.
Nadeem, T.
Fu, H.
Powiązania:
https://bibliotekanauki.pl/articles/16648000.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
antibiotic resistance
nanoparticle
plant extract
wound
Opis:
Antibiotics are used for postsurgical wound healing purposes but unfortunately, resistance against them demands some alternatives for quick recovery. Sepsis of wounds is a challenge for medical as well as veterinary professionals. Nanoparticles have significant advantages in wound treatment and drug resistance reversal. This study was conducted to appreciate emerging alternates of antibiotics like zinc oxide nanoparticles and plant extracts in topical application. Zinc oxide is considered a good wound healer and its nanoparticles are easy to access. So, the efficacies of zinc oxide nanoparticles and sweet flag plant extract ointments were tested to compare modern and traditional therapeutics as sweet flag is considered a pure medicinal plant. Rabbits were selected for this study due to the healing properties of their skin. Wounds were inflicted on the thoracolumbar region and treated for 29 days post-surgically daily with normal saline and the ointment of zinc oxide nanoparticles and sweet flag extract ointment, prepared in a hydrophilic solvent. Wound shrinkage was observed daily and histopathological analysis was made and results were compared. Zinc oxide nanoparticles ointment showed the most satisfactory results for every parameter included in the study. No side effects of its topical application were observed. Healing was normal without any complications. The preparations of zinc oxide nanoparticles may help in the era of antibiotic resistance as topical drugs in the future.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 2; 285-293
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fretting wear analysis of different tube materials used in heat exchanger tube bundle
Autorzy:
Abbas, T.
Khushnood, S.
Nizam, L. A.
Usman, M.
Powiązania:
https://bibliotekanauki.pl/articles/957958.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fretting wear
flow-induced vibration
flexible tube
cross flow velocity
Opis:
Research on heat exchange has been carried out for more than five decades because of its importance in process industries and power generation plants. Heat exchanger experiencing cross flow are vulnerable to flow-induced vibration. This vibration causes the interaction of tubes with the baffle resulting in a fretting wear of the tubes. The present study focuses on fretting wear analysis of different tube materials. Fretting wear tests were performed on aluminum, copper and stainless steel instrumented central tubes against mild steel baffle. For each tube material the tests were performed for three different test durations i.e. 60 minutes, 120 minutes and 180 minutes at a cross flow velocity of 0.55 m/s. It was observed that vibrational amplitude of the flexible test tube is affected by its weight. A scanning electron microscope was used to analyze and measure the sizes of wear scar. The results indicated that wear loss in case of aluminum tube is the highest while that in case of stainless steel tube is the lowest.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 123-133
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of inclined magnetic field and Joule heating in mixed convective peristaltic transport of non-Newtonian fluids
Autorzy:
Abbasi, F. M.
Hayat, T.
Alsaedi, A.
Powiązania:
https://bibliotekanauki.pl/articles/200788.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixed convection
eyring-prandtl fluid
sutterby fluid
inclined magnetic field
konwekcja mieszana
płyn eyringa-prandtla
płyn sutterby
pole magnetyczne
Opis:
This article describes the influence of an inclined magnetic field on the mixed convective peristaltic transport of fluid in an inclined channel. Two types of non-Newtonian fluids are considered. The problem formulation is presented for the Eyring-Prandtl and Sutterby fluids. Viscous dissipation and Joule heating in the heat transfer process are retained. The presence of a heat source in the energy equation is ensured. The resulting problems are solved by the perturbation method. The plots for different parameters of interest are given and discussed. Numerical values of a heat transfer rate are given and analyzed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 501-514
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of distributed parameter nonlinear systems by differential Taylor method
Autorzy:
Abbasov, T.
Herdem, S.
Koeksal, M.
Powiązania:
https://bibliotekanauki.pl/articles/206479.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
filtracja
równania różniczkowe zwyczajne
sterowanie
systemy nieliniowe
absorption
convective diffusion
differential Taylor transform
distributed parameter systems
ecological systems
engineering systems
Opis:
Modelling, solution, control and even design of many ecological and engineering systems involve dealing with nonlinear partial differential equations of which analytic solutions are rarely available and numerical approach with or without linearization, or approximation is inevitable most of the time. In this paper the possibility of analysing such systems by using a fairly new method known as Differential Taylor (DT) Transform and its advantages are proved. The results obtained by this method are compared with the experimental results and shown to be within good agreement with them. It is emphasised that DT Transform is not effective for only filtration systems, but can also be used equally well for absorption, heat and mass transfer, convective diffusion and similar systems.
Źródło:
Control and Cybernetics; 1999, 28, 2; 259-267
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic behavior of a rotor supported by angular ball bearings
Autorzy:
Abbes, M. S.
Hentati, T.
Maatar, M.
Fakhfakh, T.
Haddar, M.
Powiązania:
https://bibliotekanauki.pl/articles/327818.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
łożysko kulkowe skośne
wirnik
analiza dynamiczna
angular ball bearing
rotor
dynamic analysis
bearing interaction
Opis:
The wide range and large scale usage of rolling bearings indicates their necessity and vital contribution to the performance of modern industries. In this paper, a non linear model, predicting mechanical behavior of the loaded angular ball bearing, have been developed. The dynamic behavior of a rotor supported by two angular ball bearings is analyzed. The finite element method is used and the rotor is decritizied on beam elements. A mathematical modal taking account different sources of non linearity: the Hertzian contact force and the action of all balls on the bearings inner races, is developed. The Newmark algorithm coupled with Newton Raphson iterative method is used to solve the non linear differential equation iteratively.
Źródło:
Diagnostyka; 2009, 3(51); 3-8
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FTIR Study of Nanostructure Perovskite $BaTiO_3$ Doped with Both $Fe^{3+}$ and $Ni^{2+}$ Ions Prepared by Sol-Gel Technique
Autorzy:
Abdel Aal, A.
Hammad, T.
Zawrah, M.
Battisha, I.
Abou Hammad, A.
Powiązania:
https://bibliotekanauki.pl/articles/1377829.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Bc
64.70.kg
61.05.C-
78.30.Ly
81.10.Aj
Opis:
Pure barium titanate $BaTiO_3 (BT)$ and BT doped with two different transition elements $Fe^{3+}$ and $Ni^{2+}$ at 5 mol.% (BT5Fe and BT5Ni, respectively) as constant concentration in powder form have been prepared by sol-gel method using barium acetate, titanium(IV) n-butoxide, iron and nickel nitrates as precursor materials. The microstructure of BT and the influence of Fe and Ni dopants on it were investigated by X-ray diffraction and Fourier transform infrared spectroscopy. X-ray diffraction shows that tetragonal phase is dominant for pure BT sintered for 4 h at 800°C. Scanning electron microscopy and transmission electron microscopy were used to study surface morphology and particle size distribution for BT5Fe and BT5Ni, respectively. The presence of hydroxyl defects were verified by Fourier transform infrared spectroscopy for $(BaTi_{1-x}Fe_{x}O_{3-x/2}) (BT_xFe)$, where x=0.005, 0.01, 0.05, and 0.07 and $(BaTi_{1-x}Ni_{x}O_{3-x/2}) (BT_xNi)$, where x=0.005, 0.01, 0.03, 0.05, and 0.07.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1318-1321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of ascorbic acid foliar spray and seed treatment with cyanobacteria on growth and yield component of sunflower plants under saline soil conditions
Autorzy:
Abdel-Hafeez, A-N.A.A.
El-Mageed, T.A.A.
Rady, M.M.
Powiązania:
https://bibliotekanauki.pl/articles/10863.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:
International Letters of Natural Sciences; 2019, 76
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Conductivity of Cobalt Phthalocyanine
Autorzy:
Abdel-Malik, T. G.
Kassem, M. E.
Aly, N. S.
Khalil, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920784.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.40.+i
Opis:
The dielectric properties of cobalt phthalocyanine are investigated in the frequency range 50-5×10$\text{}^{5}$ Hz and within the temperature range 293-363 K. The frequency dependence of the AC impedance could be expressed by the complex plane of the complex impedance. Analysis of the AC conductivity reveals semiconducting features based predominantly on the hopping mechanism. The relaxation time, derived from the experimental results, shows a thermally activated process.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Behaviour of Potassium Acetylacetonate
Autorzy:
Abdel-Malik, T. G.
Kassem, M. E.
Abdel-Latif, R. M.
Khalil, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920790.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.40.+i
Opis:
The dielectric constant and the dielectric loss of potassium acetylacetonate, K(acac), are measured as a function of both temperature and frequency. A peak value is obtained at the a critical temperature T$\text{}_{c}$ = 313 K. X-ray analysis revealed that at T$\text{}_{c}$, K(acac) undergoes phase transition from orthorhombic to triclinic structure. The Cole-Cole diagrams have been used to determine the molecular relaxation time τ. The temperature dependence of τ is expressed by thermally activated process. The impedance spectra in the frequency range from 50 Hz to 500 kHz plotted in the complex plane show semicircles. The conduction mechanism, below T$\text{}_{c}$, is predominantly operating at the surface. Above T$\text{}_{c}$, the conduction is proceeding in the bulk material with contribution from the surface.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 681-686
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 7384

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