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排序方式: 共有103条查询结果,搜索用时 62 毫秒
41.
Merve Al Fatma Ersz Tuba
zakta Aysun Türkanolu‐
zelik Ahmet Küüketin 《International Journal of Dairy Technology》2020,73(3):578-584
In this study, the effect of recombinant microbial transglutaminase enzyme on the physicochemical properties of ice cream produced by two different methods was investigated. For this purpose, different enzyme units (2, 4 and 6 U/g milk protein) were applied to both ice cream mixture and milk. While with the first method, a 10% increase in the overrun value of ice cream samples was observed, a 7% increase was obtained by the second method. All ice cream samples exhibited pseudoplastic behaviour. This study indicated that transglutaminase concentration is an important factor in terms of improving the physicochemical properties of ice cream. 相似文献
42.
Cyclodextrins can form inclusion complexes with different molecules with the aid of their special chemical (molecular) structures. Physical and chemical properties of molecules can change after the formation of complex. This special feature enables the usage of dextrins in different industry areas. In this study, applicability of cylcodextrins in textile dyeing and washing processes was investigated. With this aim, β‐cyclodextrin was used in direct dyeing of cellulosic fabrics and in rinsing processes of direct dyed fabrics. Retarder/leveling effect of β‐cyclodextrin in dyeing process has been studied and the results were compared with that of a commercial product. In general, cyclodextrins were used in washing processes to remove the absorbed surfactants. It has been investigated whether this effect was the same for washing of dyed fabrics. Eight different direct dyes, for which the chemical structures are known, were used in dyeing and washing processes, and effect of β‐cyclodextrin on different chemical structures was investigated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 208–218, 2006 相似文献
43.
D. Alexandre Becerik Aysun Ayday L. Cenk Kumruo?lu S. Can Kurnaz Ahmet ?zel 《Journal of Materials Engineering and Performance》2012,21(7):1426-1430
In this study, 6060 aluminum alloy was coated by plasma electrolytic oxidation (PEO) process. The effect of sodium silicate concentration (A solution-7.5?g/L??B solution-15?g/L) on various morphological properties and corrosion resistance of the surface was investigated. The correlation between the microwave sintering of 6060 aluminum alloy coated by PEO and non-microwave sintering of 6060 aluminum alloy properties are discussed. Detailed estimation of the quality of the coated metal surface was performed by additional testing of chemical compositions by EDS, crystalline structure of the films was examined using x-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the oxidation layer was of typical morphology for the PEO process. The porosity amount of 6060 aluminum sample coated with 15?g/L was obtained higher than that of 7.5?g/L. In addition to, the porosity of all coated samples was decreased with increasing microwave sintering time. The corrosion resistance of coated samples with microwave sintering process was better than non-microwave sintering of 6060 aluminum alloy. 相似文献
44.
Mirco Kuhlmann Florian Scholz Marcus Barann Paul Grathwohl Aysun Gündoğan Sonja Hildebrandt Dennis Kaspuhl Andreas Seewaldt 《Informatik-Spektrum》2005,28(5):399-402
Zusammenfassung Der Palestrina-Kontrapunkt nimmt in der Musiktheorie-Ausbildung eine wichtige Stellung ein. 相似文献
45.
Aysun Kara Tuncer Faruk Haznedaroğlu Safa Tuncer 《Journal of Adhesion Science and Technology》2013,27(19):1958-1969
The purpose of this study was to compare the fracture strength and mode of teeth restored with fiber/titanium post, polyethylene fiber, and adhesive composite. The mesial, distal, and palatal walls of human maxillary molar teeth were removed, so that only the buccal wall remained. Group 1, with caries-free maxillary molars, was used as a positive control group and the remaining groups were restored as follows: group 2, with only adhesive composite; group 3, with polyethylene fiber and adhesive composite; group 4, with fiber post and adhesive composite; group 5, with fiber post, polyethylene fiber, and adhesive composite; group 6, with titanium post and adhesive composite; and group 7, with titanium post, polyethylene fiber, and adhesive composite. A universal testing machine was used for fracture tests. Compressive loads were applied at an angle of 90 degrees on the occlusal surface of the specimens at crosshead speed of 1?mm/min until fracture occurred. Kruskal–Wallis and Mann–Whitney U tests were adopted for statistical analysis. The study shows that, based on the fracture strength, the group of teeth that were restored with glass fiber post, polyethylene fiber, and adhesive composite has the most significant improvement over all the other teeth groups. Based on the fracture mode, the teeth groups restored with only glass fiber post, adhesive composite, polyethylene fiber, and adhesive composite have relatively more restorable fractures observed. 相似文献
46.
Polyphenol oxidase (PPO) was extracted from Emir grapes grown in Turkey and its characteristics in terms of pH and temperature optima, thermal inactivation, kinetic parameters and potency of some PPO inhibitors were studied. The optimum pH and temperature for grape PPO were found to be 4.2 and 25 °C respectively using catechol as substrate. Km and Vmax values were found to be 25.1 ± 2.72 mmol L−1 and 0.925 ± 0.04 OD410 min−1 respectively. Of the inhibitors tested, the most potent was sodium metabisulfite, followed by ascorbic acid. The thermal inactivation curve was biphasic. Activation energy (Ea) and Z values were calculated as 251.4 kJ mol−1 (r2 = 0.996) and 8.92 °C (r2 = 0.993) respectively. Copyright © 2006 Society of Chemical Industry 相似文献
47.
48.
56 lactic acid bacteria were isolated during shalgam fermentation and identified as Lactobacillus spp. (51 isolates), Lactococcus spp. (3 isolates), Streptococcus sp. (one isolate), and Leuconostoc sp. (one isolate). 53 of all isolates decarboxylated both arginine and tyrosine, while others decarboxylated one of arginine or tyrosine. None of the isolates could decarboxylate histidine, ornithine, lysine, phenylalanine, or tryptophan. All isolates produced both agmatine (105.8–867.5 mg L–1) and tyramine (24.5–649.7 mg L–1). Although none of the isolates displayed ornithine decarboxylase activity, putrescine was produced (2.1–33.3 mg L–1) by all isolates, except one Lactobacillus strain. Therefore, lactic acid bacteria seem to be responsible mainly for tyramine and agmatine formation during shalgam fermentation, as well as a small amount of putrescine. 相似文献
49.
Betül Şen Ayşenur Aygün Aysun Şavk Süleyman Akocak Fatih Şen 《International Journal of Hydrogen Energy》2018,43(44):20183-20191
Addressed herein, a highly efficient, durable and uniformly dispersed activated carbon supported palladium–iridium nanomaterials (3.42 ± 0.34 nm) were reported for the first time as a catalyst in dimethylamine-borane dehydrogenation reaction at the room temperature. The activated carbon supported palladium-iridium nanosheet (Pd–Ir NPs) is obtained by a simple ultrasonic reduction method, and the fabricated nanocatalyst have been defined by Ultra-Violet-Visible (UV–VIS), Raman spectroscopy, X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy (TEM) and High-Resolution Transmission Electron Microscopy (HR-TEM). These newly prepared Pd–Ir nanocomposites were found to be highly efficient and stable for dehydrocoupling of dimethylamine borane. The catalytic activity of the Pd–Ir NPs was excellent by showing the one of the best catalytic activity with a very high turnover frequency (295.1 h?1) and low Ea value of 36.6 ± 2 kJ/mol for DMAB dehydrocoupling. Another important fact about the prepared catalyst is the reusability of the catalyst was very high and easily reused five times without any significant decrease in their catalytic performance. In the current work, the synthesize, characterization and the catalytic performance of the Pd–Ir nanoparticles for the dehydrogenation of the DMAB reaction will be discussed in detail. 相似文献
50.