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1.
Polymeric oxidants in the bead form that were macroporous styrene/divinylbenzene copolymers containing N‐chlorosulfonamide functional groups (in sodium or hydrogen form) or N‐bromosulfonamide groups (in sodium form) were synthesized and investigated to determine their oxidizing powers. The redox potentials of the N‐chlorosulfonamide/sulfonamide and N‐bromosulfonamide/sulfonamide systems were determined by potentiometric studies at different pH values with aqueous solutions of Na2SO3, KCN, and KSCN as reducers. The formal redox potentials of the N‐chlorosulfonamide copolymers were 0.79, 0.44, and ?0.12 V at pH's of 1.8, 8.45, and 13.6, respectively. The formal redox potential of the N‐bromosulfonamide copolymer was about 100 mV higher in comparable conditions and in solutions over pH = 5 (e.g., 0.56 V at pH = 8.56). The comparatively higher oxidizing power of the N‐bromosulfonamide copolymer was particularly evident in a strong alkaline medium (in which the N‐chlorosulfonamide copolymer was not reactive). In contrast, the N‐chlorosulfonamide copolymer showed strong oxidative properties in acidic media (in which the N‐bromosulfonamide copolymer decomposed itself). © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008 相似文献
2.
Alina Krauze Romuald I. Zalewski 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1991,192(1):19-23
Summary Eighteen chemical and physical parameters of nectar and honeydew honeys were determined and the results were analysed statistically by the method of principal component analysis. On the plots of principal component loadings, the honeys were divided into the following groups: (1) acacia honey; (2) rape honey; (3) linden, floral (nectar coming from various plants) and heather honeys; (4) honeydew honey. The samples which were a blend of nectar and honeydew honeys may be considered as a separate group between 3 and 4. The most important first principal component was strongly associated with the value of electrical conductivity, the contents of ash, free acids and proline, as well as with the pH and the diastase number. The principal component loadings and linear correlation suggested that these parameters contributed much more to the classification of honeys than apparent reducing sugars, apparent sucrose, mono-, di-, and trisaccharides, glucose and fructose. The classification of honeys by the method of principal component analysis may serve as an additional tool in specifying samples on the basis of their chemical composition.
Klassifizierung von Honigen durch chemische und physikalische Parameter mit Hilfe der Hauptkomponentenanalyse
Zusammenfassung 18 chemische und physikalische Parameter der Nektar- und Honigtauhonige wurden bestimmt und die Ergebnisse statistisch mit Hilfe der Hauptkomponentenanalyse ausgewertet. Danach konnten die Honige in folgende Gruppen unterteilt werden: 1) Akazienhonige, 2) Rapshonige, 3) Linden-, Blüten-und Heidehonige, 4) Honigtauhonige. Zwischen dem Nektarhonig und Honigtauhonig lagen wahrscheinlich die Proben von Mischhonigen aus Blüten- und Waldtracht. Die bedeutendste erste Hauptkomponente war mit folgenden Parametern verbunden: elektrischer Leitfähigkeitswert und Aschegehalt, Gehalt an freien Säuren und Prolin sowie der pH-Wert und Diastasezahl. Aufgrund der Hauptkomponentenladungen und der linearen Korrelation kann angenommen werden, daß diese Parameter für die Honigklassifizierung von größerer Bedeutung sind als der Gehalt an reduzierenden Zuckern, scheinbarer Saccharose, Mono-, Di- und Trisaccharide, Glucose und Fructose. Die Klassifizierung der Honige mit Hilfe der Hauptkomponentenanalyse kann bei der Spezifikation einer Honigprobe aufgrund ihrer chemischen Zusammensetzung von Nutzen sein.相似文献
3.
Christian Bessiere Stéphane Cardon Romuald Debruyne Christophe Lecoutre 《Constraints》2011,16(1):25-53
In this paper, we propose two original and efficient approaches for enforcing singleton arc consistency. In the first one,
the data structures used to enforce arc consistency are shared between all subproblems where a domain is reduced to a singleton.
This new algorithm is not optimal but it requires far less space and is often more efficient in practice than the optimal
algorithm SAC-Opt. In the second approach, we perform several runs of a greedy search (where at each step, arc consistency
is maintained), possibly detecting the singleton arc consistency of several values in one run. It is an original illustration
of applying inference (i.e., establishing singleton arc consistency) by search. Using a greedy search allows benefiting from
the incrementality of arc consistency, learning relevant information from conflicts and, potentially finding solution(s) during
the inference process. We present extensive experiments that show the benefit of our two approaches. 相似文献
4.
Artur Bekaa Wodzimierz Potek Dorota Siwicka-Gieroba Joanna Soek-Pastuszka Romuald Bohatyrewicz Jowita Biernawska Katarzyna Kotfis Magdalena Bielacz Andrzej Jaroszyski Wojciech Dabrowski 《International journal of molecular sciences》2022,23(13)
Brain injury, especially traumatic brain injury (TBI), may induce severe dysfunction of extracerebral organs. Cardiac dysfunction associated with TBI is common and well known as the brain–heart crosstalk, which broadly refers to different cardiac disorders such as cardiac arrhythmias, ischemia, hemodynamic insufficiency, and sudden cardiac death, which corresponds to acute disorders of brain function. TBI-related cardiac dysfunction can both worsen the brain damage and increase the risk of death. TBI-related cardiac disorders have been mainly treated symptomatically. However, the analysis of pathomechanisms of TBI-related cardiac dysfunction has highlighted an important role of melatonin in the prevention and treatment of such disorders. Melatonin is a neurohormone released by the pineal gland. It plays a crucial role in the coordination of the circadian rhythm. Additionally, melatonin possesses strong anti-inflammatory, antioxidative, and antiapoptotic properties and can modulate sympathetic and parasympathetic activities. Melatonin has a protective effect not only on the brain, by attenuating its injury, but on extracranial organs, including the heart. The aim of this study was to analyze the molecular activity of melatonin in terms of TBI-related cardiac disorders. Our article describes the benefits resulting from using melatonin as an adjuvant in protection and treatment of brain injury-induced cardiac dysfunction. 相似文献
5.
Traumatic Acid Reduces Oxidative Stress and Enhances Collagen Biosynthesis in Cultured Human Skin Fibroblasts 下载免费PDF全文
Traumatic acid (TA) is a plant hormone (cytokinin) that in terms of chemical structure belongs to the group of fatty acids derivatives. It was isolated from Phaseolus vulgaris. TA activity and its influence on human cells and organism has not previously been the subject of research. The aim of this study was to examine the effects of TA on collagen content and basic oxidative stress parameters, such as antioxidative enzyme activity, reduced glutathione, thiol group content, and lipid peroxidation in physiological conditions. The results show a stimulatory effect of TA on tested parameters. TA caused a decrease in membrane phospholipid peroxidation and exhibited protective properties against ROS production. It also increases protein and collagen biosynthesis and its secretion into the culture medium. The present findings reveal that TA exhibits multiple and complex activity in fibroblast cells in vitro. TA, with its activity similar to unsaturated fatty acids, shows antioxidant and stimulatory effects on collagen biosynthesis. It is a potentially powerful agent with applications in the treatment of many skin diseases connected with oxidative stress and collagen biosynthesis disorders. 相似文献
6.
heodctionThe trend of imPrved gas ndine engine designwith higher Hntalc blade loadin and sInallerPhysical size attraCtS much Mon to the aeroelasticbehayour of blades not Ouly in comPI'essors, bu also intuIbines. Flow-induced triine and comPressor bladesoscillations can lead to fatigUe failures of a constrUctionand so rePrsent imPorIant Problems of reliability, safety,and operatin cost.The hahonal aPProach in flutter calculations ofblW disks is based on twency doInain analysis"ro,in whi… 相似文献
7.
Nacer Abouchi Romuald Gallorini 《Analog Integrated Circuits and Signal Processing》2001,27(1-2):73-83
The integration of various mathematical functions in ananalogue mode is a growing concern, e.g., for image processingapplications. Specific cells using CMOS technology which performarithmetical operations [1,2] have already been designed. This paperdescribes an extension of the previous cells performing the two mostfundamental transcendental functions: logarithm and exponential. Thedesign of this extension and technological issues are detailed in thispaper. The exponential function is based on MOS transistors operatingin the weak inversion region, in order to behave like bipolar transistors while remaining in a standard CMOS technology. 相似文献
8.
Nacer Abouchi Romuald Gallorini 《Analog Integrated Circuits and Signal Processing》2001,27(1-2):71-81
The integration of various mathematical functions in ananalogue mode is a growing concern, e.g., for image processingapplications. Specific cells using CMOS technology which performarithmetical operations [1,2] have already been designed. This paperdescribes an extension of the previous cells performing the two mostfundamental transcendental functions: logarithm and exponential. Thedesign of this extension and technological issues are detailed in thispaper. The exponential function is based on MOS transistors operatingin the weak inversion region, in order to behave like bipolar transistors while remaining in a standard CMOS technology. 相似文献
9.
10.
Roberta L Farrell Romuald Krazwanki Stewart Pikula 《国际造纸》2005,24(6):23-26
生物技术与术材化学、真菌学、生物化学和遗传学结合为制浆造纸工业开发出一种白化真菌产品.在制浆前用其预处理木片,能够降低水材中的树脂含量并提高术片的整体白度,减轻树脂障碍.降低纸浆的漂白要求。有人提出白化菌预处理还能起到纤维改性的作用。 相似文献