排序方式: 共有47条查询结果,搜索用时 78 毫秒
21.
Saulute Budriene Natalija Gorochovceva Tatjana Romaskevic Lyubov V. Yugova Aldona Miezeliene Gervydas Dienys Asta Zubriene 《Central European Journal of Chemistry》2005,3(1):95-105
β-galactosidase from Penicillium canescens was immobilized on chitosan, sepharose-4B, foamable polyurethane and some other carriers. The highest yield of immobilization
(up to 98%) was obtained by using chitosan as a carrier. The optimum pH and temperature were not significantly altered by
immobilization. High stability of immobilized β-galactosidase during storage was demonstrated. Efficient lactose saccharification
(over 90%) in whey was achieved by using immobilized β-galactosidase. 相似文献
22.
J. Truitt Wiensz Adam E. Bourassa Nick D. Lloyd Aldona Wiacek Randall V. Martin Doug A. Degenstein 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(8):582-593
The scattering of visible light by ice crystals and dust in radiative transfer models is challenging in part due to the large amount of scattering in the forward direction. We introduce a technique that ensures numerical conservation of photons in any radiative transfer model and that quantifies the integration error associated with highly asymmetric phase functions. When applied to a successive-orders of scatter model, the technique illustrates the high accuracy obtained in numerical integration of molecular and aerosol scattering. As well, a phase function truncation and renormalization technique is applied to scattering by ice crystals with very large size parameters, between 100 and 1000, and the scaled radiative transfer equation is solved with the spherical successive-orders model, SASKTRAN. Since computations shown this work are performed in a fully spherical model atmosphere, the computed radiances are not subject to the discontinuity at the horizon that is inherent in models using a plane–parallel assumption. The methods introduced in this work are of particular interest in modeling limb radiances in the presence of thin cirrus clouds. 相似文献
23.
Enhanced Water Splitting at Thin Film Tungsten Trioxide Photoanodes Bearing Plasmonic Gold–Polyoxometalate Particles
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Dr. Renata Solarska Krzysztof Bienkowski Dr. Sylwia Zoladek Aldona Majcher Dr. Tomasz Stefaniuk Prof. Pawel J. Kulesza Prof. Jan Augustynski 《Angewandte Chemie (International ed. in English)》2014,53(51):14196-14200
Tungsten trioxide (WO3) is one of a few stable semiconductor materials liable to produce solar fuel by photoelectrochemical water splitting. To enhance its visible light conversion efficiency, we incorporated plasmonic gold nanoparticles (Au NPs) derivatized with polyoxometalate (H3PMo12O40) species into WO3. The combined plasmonic and catalytic effect of Au NPs anchored to the WO3 surface resulted in a large increase of water photooxidation currents. Shielding the Au NPs with polyoxometalates appears to be an effective means to avoid formation of recombination centers at the photoanode surface. 相似文献
24.
Aldona Lowinska-Kluge Pawel Piszora Jolanta Darul Teresa Kantel Pawel Gambal 《Central European Journal of Physics》2011,9(2):380-386
Pilot studies concerning industrial scale application of post copper slag as a nano-additive for the modification of the corrosion
resistance of cement composites have been described. The influence of a tribochemical treatment on some physicochemical properties
as well as the corrosion resistance of the obtained composites have been evaluated based on DTG, RTG, and SEM coupled with
EDX measurements and chemical analysis. It was observed that the so-called “size particle additive effect” influences the
course and rate of transformations in the formed cement composites, and may lead to specific and desirable properties. 相似文献
25.
Renzi Marco Nobili Francesco Miecznikowski Krzysztof Kostuch Aldona Wadas Anna Rutkowska Iwona A. Kulesza Pawel J. 《Journal of Solid State Electrochemistry》2022,26(1):3-16
Journal of Solid State Electrochemistry - The catalytic activity of commercial carbon-supported PtFe (PtFe/C) nanoparticles admixed with mesoporous polyoxometalate Cs3H3PMo9V3O40, (POM3-3–9),... 相似文献
26.
Rajewska Aldona 《Pramana》2008,71(5):1079-1083
Two classic nonionic surfactants — C14E7 (heptaethylene glycol monotetradecyl ether) and C10E7 (heptaethylene glycol monodecyl ether) were investigated in heavy water solution for concentration c = 0.17% (dilute regime) at different temperatures in the range t = 10–35°C by small angle neutron scattering (SANS) method. In the case of C14E7 surfactant — for all temperatures at c = 0.17% there are two axial ellipsoidal micelles with longer axis 15 nm at 10°C and 49.5 nm at 35°C in investigated solutions.
For C10E7 surfactant at the same concentration of solution and temperature — two axial ellipsoidal micelles were observed, too. The
longer axis is equal to 7.5 nm at 10°C, 9 nm at 20°C and at 35°C this axis is equal to 12 nm. Micelles of C10E7 nonionic surfactant are smaller than those of C14E7 surfactant in the same experimental conditions.
相似文献
27.
Ada Krawcka Aldona Sobota Urszula Pankiewicz Ewelina Zieliska Piotr Zarzycki 《Molecules (Basel, Switzerland)》2021,26(22)
Stinging nettle (Urtica dioica L.) is a good source of biologically active compounds with proven beneficial health effects. This study aimed to investigate the effect of nettle herb supplementation on chemical composition, including the content of selected minerals and pigments, the in vitro glycemic response, and the cooking and sensory quality of extruded pasta. Tagliatelle-shaped pasta was produced under semi-technical scale by partial replacement of durum wheat semolina with 0, 1, 2, 3, 4, and 5% of lyophilized nettle. The partial substitution with freeze-dried nettle caused a statistically significant (p ≤ 0.05) increase in the content of minerals, especially calcium, iron, potassium, and magnesium in the products. The calcium content in the pasta fortified with 5%-addition of stinging nettle was 175.9 mg 100 g−1 and this concentration was 5.8 times higher than in the control sample. At the same time, high content of chlorophylls and carotenoids (237.58 µg g−1 and 13.35 µg g−1, respectively) was noticed. Enriching pasta with a 0–5% addition of stinging nettle resulted in a statistically significant (p ≤ 0.05) increase in the content of the total dietary fiber (TDF) (from 5.1 g 100 g−1 to 8.82 g 100 g−1) and the insoluble dietary fiber (IDF) (from 2.29 g 100 g−1 to 5.63 g 100 g−1). The lowest hydrolysis index of starch (HI = 17.49%) and the lowest glycemic index (GI = 49.31%) were noted for the pasta enriched with 3% nettle. 相似文献
28.
Aldona Siennicka Magdalena Kysz Monika Adamska Kornel Chestowski Andrzej Biskupski Maria Jastrzbska 《Molecules (Basel, Switzerland)》2021,26(24)
The recommended pharmacological therapy for patients with coronary artery disease (CAD) treated by coronary artery bypass grafting (CABG) is acetylsalicylic acid (ASA). To improve the antiplatelet effect, supplementation with flavonoids is also recommended. The aim of this study was to estimate anti-aggregation properties of diosmin, in combination with ASA, pre- and postoperatively and assess the relationship of this therapy with inflammatory processes in CAD patients undergoing CABG. The study patients (n = 26) took diosmin (1000 mg/day); the control patients (n = 27) took a placebo. The therapeutic period for taking diosmin was from at least 30 days before to 30 days after CABG. All patients also took 75 mg/day ASA. Platelet aggregation and IL-6, CRP, and fibrinogen concentrations were determined before and 30 days after surgery. Results showed that diosmin did not enhance the anti-aggregation effect of ASA at any assessment time. However, there was a stronger anti-aggregation effect 30 days after surgery that was diosmin independent and was associated with acute-phase markers in the postoperative period. Increased levels of inflammatory markers in the late phase of the postoperative period may provide an unfavorable prognostic factor in long-term follow-up, which should prompt the use of stronger antiplatelet therapy in patients after CABG. 相似文献
29.
Sokol Denis Salak Andrei N. Ferreira Mário G. S. Beganskiene Aldona Kareiva Aivaras 《Journal of Sol-Gel Science and Technology》2018,85(1):221-230
Journal of Sol-Gel Science and Technology - Magnesium–aluminium–bismuth-layered double hydroxides (LDH) intercalated with carbonate were studied in respect of maximal rate of... 相似文献
30.
The linewidth ΔH pp and spin-Hamiltonian parameters under temperature and high hydrostatic pressure by X-band continuous wave electron paramagnetic resonance in the K3H(SO4)2 crystal were studied. Spin-Hamiltonian parameters, direction cosines and coordination of Mn2+ ion were determined at room temperature. The pressure at 300?MPa leads to the change of hydrogen bond potential and the transition from double well to single well potential moves about 10?K towards a higher temperature. 相似文献