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排序方式: 共有125条查询结果,搜索用时 15 毫秒
71.
Karima Boubekri Junko Yano Satoru Ueno Kiyotaka Sato 《Journal of the American Oil Chemists' Society》1999,76(8):949-955
Polymorphic transformations of sn-1,3-distearoyl-2-ricinoleyl-glycerol (SRS) have been studied with differential scanning calorimetry, X-ray powder diffraction
(XRD), synchrotron radiation X-ray diffraction, and Fourier transform infrared spectroscopy (FTIR) techniques by using a 99.8%
pure sample. Four polymorphs, α, γ, β′2, and β′1, were isolated. The thermal behavior of the four forms showed that the fusion of α at 25.8°C was followed by the crystallization
of γ which melts at 40.6°C, and β′2 and β′1 revealed melting peaks at 44.3 and 48.0°C, respectively. No β form was observed, even when the two β′ forms were annealed
around their melting points over one week. The XRD long spacing indicates that α packs into a double chain-length structure;
however, γ and the two β′ phases pack into a triple chain-length structure. The polarized and nonpolarized FTIR spectra in
methylene scissoring and methylene rocking regions indicated a parallel subcell packing in γ, and a mixture of orthorhombic
perpendicular and parallel or hexagonal subcells in the β′2 and β′1 phases. Consequently, SRS exhibits quite a unique polymorphic behavior, compared to tristearoyl glycerol and sn-1,3-distearoyl-2-oleoyl-glycerol. 相似文献
72.
Ridha Ghali Karima H Khlifa Hayat Ghorbel Khira Maaroufi Abderrazak Hedilli 《Journal of the science of food and agriculture》2010,90(14):2347-2351
BACKGROUND: To investigate natural aflatoxin occurrence, a total of 180 samples of different foods widely consumed in Tunisia were analysed by an in‐house‐validated high‐performance liquid chromatography method including affinity column clean‐up and post‐column bromination techniques. RESULTS: The method used appeared to be rapid, selective and reproducible, and its performances were established. Detection limits were 0.05 ng g?1 for aflatoxin B1 and 0.025 ng g?1 for aflatoxins B2, G1 and G2. Aflatoxins were detected in all investigated commodities except rice, with an overall contamination frequency of 34.4% and concentrations ranging from 0.1 to 40.6 ng g?1. Aflatoxin B1 was found in all contaminated samples. Sorghum, spices and nuts were most contaminated. CONCLUSION: This study has provided an effective analytical method for the reliable determination of aflatoxins in food samples. Over one‐third of the samples investigated were contaminated with aflatoxins. Sorghum, spices and nuts were most contaminated, whereas rice showed no contamination. Copyright © 2010 Society of Chemical Industry 相似文献
73.
Touia Amina Benyahia Karima Tekin Adem 《Journal of Superconductivity and Novel Magnetism》2021,34(10):2689-2698
Journal of Superconductivity and Novel Magnetism - The structural, electronic, optical, and thermo-electric properties of LuNiBi and LuNiSb Half-Heusler have been studied using a full potential... 相似文献
74.
Technological and safety properties of Lactobacillus plantarum strains isolated from a Tunisian traditional salted meat 总被引:2,自引:0,他引:2
A total of 17 strains of Lactobacillus plantarum, isolated from a Tunisian traditional salted meat and identified by biochemical and molecular methods, were characterized according to their technological properties including acidifying, antimicrobial and enzymatic activities as well as antibiotic resistance in order to select the most suitable for use as starter cultures for the production of fermented sausages. All the strains studied showed good acidifying activity and were able to reduce the pH to less than 4.3 in 72, 48 and 24h at 15, 25 and 37°C respectively. The majority of strains displayed antimicrobial activities against Salmonella arizonae, Staphylococcus aureus, Pseudomonas aeuroginosa and Escherichia coli, however characterization of the antimicrobial substances showed that none of the strains could produce bacteriocins. All the L. plantarum strains were able to hydrolyze casein, whereas none of them was found to possess lipolytic activity. The majority of strains of L. plantarum were resistant to tetracycline, erythromycin, rifampicin, ampicillin and penicillin G. 相似文献
75.
Dina Atmani Nassima ChaherMeriem Berboucha Karima AyouniHakima Lounis Hania BoudaoudNadjet Debbache Djebbar Atmani 《Food chemistry》2009
Extracts from the bark of Fraxinus angustifolia as well as the leaves of Pistacia lentiscus and Clematis flammula have been investigated for their reducing power, inhibition of linoleic acid peroxidation and scavenging capacity on 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and H2O2 using in vitro spectrophotometric methods. The results indicate that the best overall antioxidant capacity was shown by extracts of Pistacia lentiscus, followed by Fraxinus angustifolia and Clematis flammula. 相似文献
76.
77.
Abdelfettah Gherib Yazid Bedouh Karima Messai Ahmed Menad 《The International journal of environmental studies》2016,73(2):214-225
This paper reports a study of pollution in the coastal waters of Jijel, Algeria, using algae Ulva lactuca and Corallina officinalis as bioindicators. Samples of seawater and algae were collected at four different stations from the coast of Jijel, during the period of April–June 2014. The heavy metal content (Pb and Zn) was determined in seawater and in the algae tissue by the technique of atomic absorption spectrophotometry. In seawater, the contents of heavy metals vary from 0.017 to 0.03 mg/l (Pb) and 0.235 to 0.873 mg/l. In the algae tissues, metals concentrations vary between 1.88 to 6.25 μg g?1 dry weight (Pb), and from 92 to 178.9 μg g?1 dry weight (Zn). These levels differ by site and species. The calculation of the bioconcentration factor (BCF) leads us to conclude that algae bioaccumulate significant levels of Pb and Zn metals in their tissues. Our results shows that the species of C. officinalis bioaccumulate the metals Pb and Zn more than U. lactuca, where, high biosorption of Zn was observed with BCF values between 203.21 and 238.40. Zn content in seawater and algae tissues appear higher than standards set by USEPA and guides values of Certified Reference Materials, but Pb levels appear lower than this standard. 相似文献
78.
Mounir El Achaby Youness Essamlali Nassima El Miri Asmae Snik Karima Abdelouahdi Aziz Fihri Mohamed Zahouily Abderrahim Solhy 《应用聚合物科学杂志》2014,131(22)
Bio‐nanocomposite films based on chitosan/polyvinylpyrrolidone (CS/PVP) and graphene oxide (GO) were processed using the casting/evaporation technique. It has been found that the three components of bio‐nanocomposites can be easily mixed in controlled conditions enabling the formation of thick films with high quality, smooth surface and good flexibility. Structural and morphological characterizations showed that the GO sheets are well dispersed in the CS/PVP blend forming strong interfacial interactions that provide an enhanced load transfer between polymer chains and GO sheets thus improving their properties. It has been found that the water resistance of the CS/PVP blend is improved, and the hydrolytic degradation is limited by addition of 0.75 and 2 wt % GO. The modulus, strength, elongation and toughness of the bio‐nanocomposites are together increased. Herein, the steps to form new bio‐nanocomposite films have been described, taking the advantage of the combination of CS, PVP and GO to design the aforementioned bio‐nanocomposite films, which allow to have extraordinary properties that would have promising applications as eventual packaging materials. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41042. 相似文献
79.
Karima Adel-Aissanou Djamil Aïssani Nathalia Djellab Noufissa Mikou 《Telecommunication Systems》2014,57(2):197-207
In this paper, we exploit the utility of Hello messages in the Ad hoc networks to study the impact of their transmission frequencies on the connectivity of the network. Assuming that the Hello messages arrive at a given node according to a Poisson process, we model a cluster-head motion (respectively an ordinary node motion) using a random process. This model allows us to find the critical value of the transmission frequency of Hello messages. We also have investigate a fundamental property of an Ad hoc network: its connectivity. We then analyze the number of neighbors of a given node, the isolation probability, the handoff probability and the probability that the considered network is connected, i.e. each node can communicate with an other node via the network. 相似文献
80.
Karima Habbout Junichi Omura Charifa Awada Alice Bourgeois Yann Grobs Vinod Krishna Sandra Breuils-Bonnet Eve Tremblay Ghada Mkannez Sandra Martineau Valrie Nadeau Florence Roux-Dalvai Mark Orcholski Jey Jeyaseelan David Gutstein Franois Potus Steeve Provencher Sbastien Bonnet Roxane Paulin Olivier Boucherat 《International journal of molecular sciences》2021,22(6)