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排序方式: 共有608条查询结果,搜索用时 15 毫秒
31.
32.
Karl Speer Peter Horstmann Elke Steeg Thomas Kühn und Alfred Montag 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1990,191(6):442-448
Zusammenfassung Die Bestimmung der ubiquitär verbreiteten Polycyclen bereitet oftmals in Gemüseproben Schwierigkeiten. Vorgestellt werden daher Verfahren, mit denen man eine Abtrennung der störenden Stoffe wie etherische Öle, Wachse, Carotinoide und Chlorophylle erreicht. Als besonders geeignet erweist sich dabei die Reinigung der Probenextrakte an Bio Beads S-X3 und mittels der halbpräparativen HPLC an Kieselgel Si60. Die Polycyclen werden durch CGC/MS bestimmt. Hierdurch ist es möglich, neben den zu bestimmenden Analyten auch die zugesetzten deuterierten Standardverbindungen störungsfrei zu erfassen. Die Resultate 32 verschiedener Gemüseproben werden diskutiert. Höhere Gehalte findet man in Grünkohl- und Petersilienproben.
PAH analysis in vegetable samples
Summary PAH analyses in vegetables are often difficult to carry out; therefore two different clean-up methods, which allow elimination of interfering matrix components such as essential oils, waxes, carotinoids and chlorophylls were developed. Clean-up of 32 different vegetables samples consisted of either Bio-Beads S-X3 chromatography or semi-preparative HPLC on silica gel Si-60. PAH were determined by capillary GC-MS, which allowed the application of deuterium-labelled internal standards. The results are presented; higher PAH contamination was detected in cale and parsley.相似文献
33.
Uwe Klammert Elke Vorndran Tobias Reuther Frank A. Müller Katharina Zorn Uwe Gbureck 《Journal of materials science. Materials in medicine》2010,21(11):2947-2953
Synthetic bone replacement materials are of great interest because they offer certain advantages compared with organic bone
grafts. Biodegradability and preoperative manufacturing of patient specific implants are further desirable features in various
clinical situations. Both can be realised by 3D powder printing. In this study, we introduce powder-printed magnesium ammonium
phosphate (struvite) structures, accompanied by a neutral setting reaction by printing farringtonite (Mg3(PO4)2) powder with ammonium phosphate solution as binder. Suitable powders were obtained after sintering at 1100°C for 5 h following
20–40 min dry grinding in a ball mill. Depending on the post-treatment of the samples, compressive strengths were found to
be in the range 2–7 MPa. Cytocompatibility was demonstrated in vitro using the human osteoblastic cell line MG63. 相似文献
34.
Elke Bruns 《城市环境设计》2008,(1):34-34
德国在20世纪70年代时就已经开始做环境评估,并且发展得非常快。环境污染问题的产生让人们意识到自然资源的消耗是不可持续的。所以在1976年,通过了首个关于减少环境影响的法律法规。1988年,德国环保局针对人们的居住地环境做出了一些规定,同时它也再一次提到了减少环境影响,所有大的开发商都必须高度重视这一点。在法律当中还规定了一系列的项目,这些项目都要合乎环保标准,它具有法律约束力,所有的地方都要遵守。比如说要恢复旧的居住地的时候,必须按照环保的规定来做。 相似文献
35.
The dependence of the depth of cure (DOC) and degree of conversion (DC) on the depth of experimental and commercial materials were determined according to ISO 4049 procedure and with the use of Raman spectroscopy, respectively. Moreover, an attempt was made to find the correlation between the DOC and DC and the depth of the material. The hypothesis was that curing time recommended by the manufacturers is appropriate for curing both commercial and experimental materials to achieve comparable values of the examined properties. The impact of the filler characteristic was clearly observed. The longer curing time provides a deeper curing (DOC values) and higher reaction rate (DC); however, the dependence between the DC values and DOC values was not visible. Instead, a logarithmic trend in the relation of the DOC and curing time was clearly observed. The results of this study suggest that the experimental materials give some hope for potential clinical applications and should be further investigated. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42812. 相似文献
36.
Schlorf T Meincke M Kossel E Glüer CC Jansen O Mentlein R 《International journal of molecular sciences》2010,12(1):12-23
Superparamagnetic iron-oxide particles (SPIO) are used in different ways as contrast agents for magnetic resonance imaging (MRI): Particles with high nonspecific uptake are required for unspecific labeling of phagocytic cells whereas those that target specific molecules need to have very low unspecific cellular uptake. We compared iron-oxide particles with different core materials (magnetite, maghemite), different coatings (none, dextran, carboxydextran, polystyrene) and different hydrodynamic diameters (20-850 nm) for internalization kinetics, release of internalized particles, toxicity, localization of particles and ability to generate contrast in MRI. Particle uptake was investigated with U118 glioma cells und human umbilical vein endothelial cells (HUVEC), which exhibit different phagocytic properties. In both cell types, the contrast agents Resovist, B102, non-coated Fe(3)O(4) particles and microspheres were better internalized than dextran-coated Nanomag particles. SPIO uptake into the cells increased with particle/iron concentrations. Maximum intracellular accumulation of iron particles was observed between 24 h to 36 h of exposure. Most particles were retained in the cells for at least two weeks, were deeply internalized, and only few remained adsorbed at the cell surface. Internalized particles clustered in the cytosol of the cells. Furthermore, all particles showed a low toxicity. By MRI, monolayers consisting of 5000 Resovist-labeled cells could easily be visualized. Thus, for unspecific cell labeling, Resovist and microspheres show the highest potential, whereas Nanomag particles are promising contrast agents for target-specific labeling. 相似文献
37.
Marie-Theres Hutchison Dr. Giovanni Bellomo Dr. Alexey Cherepanov Elke Stirnal Dr. Boris Fürtig Dr. Christian Richter Verena Linhard Elina Gurewitsch Prof. Dr. Moreno Lelli Prof. Dr. Nina Morgner Prof. Dr. Thomas Schrader Prof. Dr. Harald Schwalbe 《Chembiochem : a European journal of chemical biology》2023,24(7):e202200760
The aggregation of amyloid-β 42 (Aβ42) is directly related to the pathogenesis of Alzheimer's disease. Here, we have investigated the early stages of the aggregation process, during which most of the cytotoxic species are formed. Aβ42 aggregation kinetics, characterized by the quantification of Aβ42 monomer consumption, were tracked by real-time solution NMR spectroscopy (RT-NMR) allowing the impact that low-molecular-weight (LMW) inhibitors and modulators exert on the aggregation process to be analysed. Distinct differences in the Aβ42 kinetic profiles were apparent and were further investigated kinetically and structurally by using thioflavin T (ThT) and transmission electron microscopy (TEM), respectively. LMW inhibitors were shown to have a differential impact on early-state aggregation. Insight provided here could direct future therapeutic design based on kinetic profiling of the process of fibril formation. 相似文献
38.
Sarah Kate Walsh Alice Lucey Jens Walter Emanuele Zannini Elke K. Arendt 《Comprehensive Reviews in Food Science and Food Safety》2022,21(3):2930-2955
Dietary fiber intakes in Western societies are concerningly low and do not reflect global recommended dietary fiber intakes for chronic disease prevention. Resistant starch (RS) is a fermentable dietary fiber that has attracted research interest. As an isolated ingredient, its fine particle size, relatively bland flavor, and white appearance may offer an appealing fiber source to the Western palate, accustomed to highly refined, processed grains. This review aims to provide a comprehensive insight into the current knowledge (classification, production methods, and characterization methods), health benefits, applications, and acceptability of RS. It further discusses the present market for commercially available RS ingredients and products containing ingredients high in RS. The literature currently highlights beneficial effects for dietary RS supplementation with respect to glucose metabolism, satiety, blood lipid profiles, and colonic health. An exploration of the market for commercial RS ingredients indicates a diverse range of products (from isolated RS2, RS3, and RS4) with numerous potential applications as partial or whole substitutes for traditional flour sources. They may increase the nutritional profile of a food product (e.g., by increasing the fiber content and lowering energy values) without significantly compromising its sensory and functional properties. Incorporating RS ingredients into staple food products (such as bread, pasta, and sweet baked goods) may thus offer an array of nutritional benefits to the consumer and a highly accessible functional ingredient to be greater exploited by the food industry. 相似文献
39.
Optimization of baking parameters of part-baked and rebaked Irish brown soda bread by evaluation of some quality characteristics 总被引:3,自引:0,他引:3
Renata G. K. Leuschner Michael J. A. O'Callaghan Elke K. Arendt 《International Journal of Food Science & Technology》1997,32(6):487-493
Summary Part-baked Irish brown soda bread loaves with bicarbonate levels from 0 to 2.8 % were baked, packed and stored for up to 11 days at 5 C then second-baked at 180 or 200 C for various times to give an oven-fresh end product. The quality of the rebaked bread was dependent on characteristics of the part-baked bread, its storage conditions and the processing parameters of the second baking phase. Quality parameters evaluated were bread volume yield, crumb and crust firmness, moisture content and colour. Staling of the part-baked bread during storage at 5 C and the reversion of this process at 59 C was investigated with regard to rebaking time and temperature. Rebaking conditions were optimized by evaluating the core temperature increase in the centre of the bread. Immediately after the second baking phase a post-baking temperature increase was measured which allowed reduction of the in-oven rebaking time. The data were modelled mathematically using least squares analyses. 相似文献
40.
Prof. Dr. Torsten Steinmetzer Dr. Bernhard Baum Dr. Adam Biela Prof. Dr. Gerhard Klebe Prof. Dr. Götz Nowak Dr. Elke Bucha 《ChemMedChem》2012,7(11):1965-1973
During extracorporeal circulation, when blood comes in contact with artificial surfaces, patients receive a standard treatment with anticoagulants to avoid blood coagulation. Dialysis patients in particular are systemically treated with heparin up to four times a week, causing a high burden for the body. For potential anticoagulant modification of external materials, such as dialysis equipment, a series of highly potent thrombin inhibitors was developed. All inhibitors share the general formula arylsulfonyl‐P3‐Pro‐4‐amidinobenzylamide, where P3 is glycyl or a trifunctional amino acid residue in L ‐configuration. Among this series, several derivatives inhibit thrombin with Ki values of less than 1 nM . Specificity measurements revealed that this inhibitor type is highly specific for thrombin with negligible activity against related trypsin‐like serine proteases. X‐ray analysis of the most potent analogue in complex with thrombin demonstrated that the N‐terminal arylsulfonyl group occupies the aryl binding site, whereas the P3 side chain is directed into the solvent and therefore is well suited for further coupling. Based on their in vitro profile, these inhibitors are suitable candidates for the development of hemocompatible materials with anticoagulant properties. 相似文献