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1.
O Senthil Kumar K Balkis Ameen S Soundeswaran T Rajasekharan R Dhanasekaran 《中国稀土学报(英文版)》2006,24(Z1)
ZnSe∶Mn nanocrystals were grown by chemical vapour transport method using the matrix of SiO2 aerogels. The cubic structure of the nanocrystals was confirmed by powder X-ray diffraction (XRD) and electron diffraction (ED) studies. The size of the crystals was observed using transmission electron microscope (TEM). The oxidation state of Mn in ZnSe nanocrystal was found using electron spin resonance (ESR) spectrum. The room temperature luminescence measurements show the peaks corresponding to both bandgap of the material and Mn in ZnSe. 相似文献
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3.
Prof. Dr. Özkan Özden Dr. Şafak Ulusoy Assoc. Prof. Dr. Nuray Erkan 《Journal für Verbraucherschutz und Lebensmittelsicherheit》2010,5(3-4):407-412
Sea food is a major source of animal protein. Marine foods are very rich sources of mineral components. The total content of minerals in the raw flesh of marine fish and invertebrates is in the range of 0.6–1.5% wet weight. The contents of Na, K, Ca, Mg and P are up to 1 mg/100 g, whereas those of Fe, Zn, I are less than 1 mg/100 g. Mussels (Mytilus galloprovincialis) were investigated for macro and trace element composition throughout the year. Ranges of moisture, ash, protein and fat contents were 79.76–87.46 g/100 g, 1.06–2.06 g/100 g, 7.28–12.65 g/100 g and 0.33–3.49 g/100 g, respectively. While the highest protein and fat values were found in the summer (July–August), the highest moisture and ash contents were found in the winter (December–January). The contents of highest Na, K, Ca were found in the summer. Cadmium, lead and copper were found to be below the legislative limits throughout year. High levels of mercury were found in January and October. It should be discussed whether mussel may provide an alternative source of mineral for healthy nutrition. 相似文献
4.
H. Esra Ülker Ali Ihsan Erkan Nuray Günaydın Firdevs Kahvecioğlu Mustafa Ülker 《Journal of Adhesion Science and Technology》2016,30(10):1119-1130
Purpose: The purpose of the present study was to compare the Vickers hardness numbers (VHNs), roughness numbers (RNs) and biological compatibility of glass carbomer (Glass Fill), resin-modified glass ionomer (Fuji II LC) and self-adhering flowable composite (Vertise Flow) materials. Materials and methods: Disc-shaped specimens of test materials (n = 15/group) were prepared, and VHNs and RNs were determined after 24 h. A direct contact test was used for cytotoxicity evaluation. Cell viability was measured for 24 h post-exposition with a photometric test (MTT assay; n = 16). Data were analysed using one-way analysis of variance with a post hoc Tukey’s test, the Kruskal–Wallis test and the Mann–Whitney U-test (p < 0.05). Results: Fuji II LC had the highest VHN. The VHN of Fuji II LC differed significantly from those of the other materials (p < 0.05). The RNs of Fuji II and Glass Fill were higher than that of Vertise Flow (p < 0.05). The self-adhering materials were not significantly cytotoxic compared with the control group (p > 0.05). Conclusions: The materials tested in this study showed a similar lack of cytotoxicity. The VHN of Fuji II LC was the highest, and the RN of Vertise Flow was the lowest. 相似文献
5.
Kemal Kocabaş Özlem Bilgili Nuray Yaşar 《Journal of Superconductivity and Novel Magnetism》2009,22(7):643-650
In this study, the effects of sintering temperature on the Bi-2223 phase formation and the influence of minor phases on the
intergranular properties of Sb substituted Bi-2223 samples were investigated. The samples were prepared by solid-state reaction
method with different sintering temperatures ranging from 800 to 855 °C. The samples were characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM) and density measurements. We observed the optimal temperature of the Sb + Pb substituted
Bi-2223 system as 845 °C. 相似文献
6.
Fatih Özogul Özkan Özden Yeşim Özoğul Nuray Erkan 《International Journal of Food Science & Technology》2010,45(11):2290-2296
Nucleotide degradation products of irradiated sea bream stored up to 19 days in ice were investigated. Irradiation had significant effect on the nucleotide concentrations in sea bream muscle (P < 0.05). The results showed that the highest value of inosine monophosphate (IMP) was observed in irradiated sea bream at 5 kGy, followed by at 2.5 kGy. Initial inosine (INO) concentration in irradiated sea bream at 5 kGy was 4.26 μmoles g?1, which reached maximum value of 8.83 μmoles g?1 when fish completely spoiled (19 days). When the fish reached the limit of acceptability, the mean values of K, Ki, H and G were 86.8%, 90.3%, 59.8% and 213.9% for unirradiated sea bream, 85.2%, 87.8%, 56.8% and 197.8% for irradiated sea bream at 2.5 kGy and 88.4%, 90.9%, 57.8%, 211.5% for irradiated sea bream at 5 kGy, respectively. The results of this study indicated that nucleotide degradation was more rapid in unirradiated sea bream than those irradiated. K, Ki, H and G value in irradiated fish can be used as a freshness index because there is a good linear relationship between values and storage time of fish. 相似文献
7.
Storage stability of low-fat beef frankfurters formulated with carrageenan or carrageenan with pectin 总被引:1,自引:0,他引:1
Storage stability of low-fat frankfurters (<3.0 fat content) formulated with carrageenan (0.3, 0.5, and 0.7%) or carrageenan with a pectin gel (PG) (20%) was examined during 49-day refrigerated storage. Low fat frankfurters had higher bacterial growth than high-fat control (HFC) over the refrigerated storage due to higher water activity resulting from extra water addition. While there was no change in the pH of low-fat frankfurters initially due to carrageenan or PG incorporation, the most noticeable pH decline was observed in PG-added frankfurters followed by only carrageenan added ones over the storage period. HFC had the highest (P<0.05) TBA value and the lowest redness index (a(?)/b(?)) all the time as compared with carrageenan or carrageenan and PG added low-fat frankfurters. Low-fat frankfurters formulated with either carrageenan or carrageenan with PG had acceptable sensory scores. 相似文献
8.
Formation of chlorination by-products in waters with low SUVA--correlations with SUVA and differential UV spectroscopy 总被引:4,自引:0,他引:4
The formation of THMs and HAAs after chlorination of bulk water fractions of low-SUVA (specific UV absorbance) surface waters was investigated, and the applicability of SUVA and differential UV spectroscopy for monitoring THMs and HAAs in such waters was evaluated. Samples from two reservoirs were fractionated employing XAD-8, XAD-4, MIEX resin and granular activated carbon adsorption. A total of 83 bulk water NOM fractions (i.e., the remaining solutions after contact with the adsorbent or resin at various doses) were obtained and chlorinated. The majority of NOM in both waters was found to have average molecular weights <2000 Da and SUVA values <2L/mg Cm, indicating that NOM in the tested waters contained dominantly lower molecular weight fractions and low aromaticity. SUVA did not correlate well with the formation and speciation of THMs and HAAs, suggesting that SUVA does not capture the reactive sites on NOM moieties responsible for DBP formation in low-SUVA waters. Similarly, no correlations were found among THMs/HAAs formations and differential UV spectroscopy, indicating the formation of DBPs independent of destruction in UV-absorbing sites. In all fractions, concentrations of THMs were higher than those of HAAs. Chlorinated DBP species were dominant over brominated ones due to low bromide concentrations. The results overall suggested that low- or non-UV-absorbing NOM moieties play important roles in the formation of DBPs in waters with low SUVA, low DOC and low bromide levels. 相似文献
9.
10.
?zkan ?zden ?afak Ulusoy Nuray Erkan 《Journal für Verbraucherschutz und Lebensmittelsicherheit》2010,4(1):407-412
Sea food is a major source of animal protein. Marine foods are very rich sources of mineral components. The total content
of minerals in the raw flesh of marine fish and invertebrates is in the range of 0.6–1.5% wet weight. The contents of Na,
K, Ca, Mg and P are up to 1 mg/100 g, whereas those of Fe, Zn, I are less than 1 mg/100 g. Mussels (Mytilus galloprovincialis) were investigated for macro and trace element composition throughout the year. Ranges of moisture, ash, protein and fat
contents were 79.76–87.46 g/100 g, 1.06–2.06 g/100 g, 7.28–12.65 g/100 g and 0.33–3.49 g/100 g, respectively. While the highest
protein and fat values were found in the summer (July–August), the highest moisture and ash contents were found in the winter
(December–January). The contents of highest Na, K, Ca were found in the summer. Cadmium, lead and copper were found to be
below the legislative limits throughout year. High levels of mercury were found in January and October. It should be discussed
whether mussel may provide an alternative source of mineral for healthy nutrition. 相似文献