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Coordination System (coordination + system)
Selected AbstractsA Multinuclear Coordination System of L -Cysteine and L -Penicillamine That Induce Opposite Chiralities at Metal CentersANGEWANDTE CHEMIE, Issue 45 2009Yuko Sameshima Gleich und doch verschieden:L -Cystein (L -Cys) und L -Penicillamin (L -Pen) bilden die gleichen fünfkernigen AuI3M2 -Strukturen (M=NiII, CoIII) mit allerdings umgekehrten Konfigurationen. Als Ursache für dieses Phänomen werden intramolekulare Wasserstoffbrücken und sterische Wechselwirkungen vermutet, die auch erklären könnten, weshalb sich in der Natur D -Penicillamin wie L -Cystein verhält. [source] Resource management in open Linda systemsCONCURRENCY AND COMPUTATION: PRACTICE & EXPERIENCE, Issue 13 2003Ronaldo Menezes Abstract Coordination systems, in particular Linda, have established themselves as important tools for the development of applications to open systems such as the Internet. This paper shows how to tackle a forgotten, but crucial problem in open coordination systems: memory management. As with any system which intends to be of wide use and because memory is a finite resource, coordination systems must address the problems of memory exhaustion. This paper first explores the orthogonality between coordination and computation in order to make it clear that the problem of memory exhaustion in coordination systems cannot be solved using garbage collection schemes implemented at the computation language,a garbage collection scheme must exist in the coordination environment as well. Following the explanation on orthogonality, the paper will focus on describing a garbage collection scheme for the Linda family of coordination systems. It is expected that the solution in Linda can be adapted to other coordination systems as long as they are based on tuple space communication. Copyright © 2003 John Wiley & Sons, Ltd. [source] Interactive force control of an operator,mobile manipulator coordination systemJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 4 2002Jae H. Chung In this article, a new type of coordination control called interactive force control is developed for an operator,mobile manipulator coordination system (OMMCS) based on a base force/torque sensor. In the interactive force control scheme, a robust force control of the manipulator and impedance control of the mobile platform are integrated to achieve smooth interaction between the operator, the manipulator, and the mobile platform. In simulation, the developed methods are compared for control performance in tracking and force regulation. Simulation results show the promise of the developed control scheme, which utilizes robust force control based on a base force/torque sensor. © 2002 Wiley Periodicals, Inc. [source] Putative Nitrogen Sensing Systems in Higher PlantsJOURNAL OF INTEGRATIVE PLANT BIOLOGY, Issue 8 2006Hon-Ming Lam Abstract Nitrogen (N) metabolism is essential for the biosynthesis of vital biomolecules. N status thus exerts profound effects on plant growth and development, and must be closely monitored. In bacteria and fungi, a few sophisticated N sensing systems have been extensively studied. In animals, the ability to receive amino acid signals has evolved to become an integral part of the nervous coordination system. In this review, we will summarize recent developments in the search for putative N sensing systems in higher plants based on homologous systems in bacteria, fungi, and animals. Apparently, although plants have separated and diversified from other organisms during the evolution process, striking similarities can be found in their N sensing systems compared with those of their counterparts; however, our understanding of these systems is still incomplete. Significant modifications of the N sensing systems (including cross-talk with other signal transduction pathways) in higher plants may be a strategy of adaptation to their unique mode of life. (Managing editor: Ping He) [source] Soil organic matter composition and soil lightnessJOURNAL OF PLANT NUTRITION AND SOIL SCIENCE, Issue 5 2004Sandra Spielvogel Abstract Relationships between soil lightness, soil organic matter (SOM) composition, content of organic C, CaCO3, and texture were studied using 42 top-soil horizons from different soil types located in southern Germany. SOM composition was determined by CPMAS 13C NMR spectroscopy, soil color was measured by diffuse-reflectance spectrophotometry and given in the CIE L*a*b* color coordination system (Commission Internationale de l'Eclairage, 1978). Multiple-regression analysis showed, that soil lightness of top-soil horizons is principally determined by OC concentration, but CaCO3 and soil texture are also major variables. Soil lightness decreased with increasing OC content. Carbonate content had an important effect on soil lightness even at low concentrations due to its lightening property. Regressions between soil lightness and organic C content were strongly linear, when the soils were differentiated according to texture and CaCO3 content. The aryl-C content was the only SOM component which correlated significantly with soil lightness (rS = ,0.87). In the linear regressions carried out on the different soil groups, soil aryl-C content was a more significant predictor for soil lightness than total OC content. Zusammensetzung der organischen Bodensubstanz und Bodenhelligkeit Der Zusammenhang zwischen Bodenhelligkeit, Zusammensetzung der organischen Substanz und Gehalt an Corg., CaCO3 und Textur wurde in 42 Oberböden aus verschiedenen Bodentypen Süddeutschlands untersucht. Die Zusammensetzung der organischen Substanz wurde mittels CPMAS- 13C-NMR-Spektroskopie bestimmt, die Bodenfarbe mittels Spektralphotometer und als Bodenhelligkeitswert im CIE L*a*b*-Farbkoordinatensystem (Commission Internationale de l'Eclairage, 1978) angegeben. Die Auswertung über multiple Regression zeigte, dass die Bodenhelligkeit hauptsächlich vom OC-Gehalt bestimmt wird; CaCO3 -Gehalt und Textur erwiesen sich als weitere relevante Variablen. Die Bodenhelligkeit nimmt mit zunehmendem OC-Gehalt ab. Aufgrund seiner stark aufhellenden Wirkung hat der Carbonatgehalt auch bei niedrigen Konzentrationen einen deutlichen Einfluss auf die Bodenhelligkeit. Bei Berücksichtigung der Textur und des Carbonatgehalts ergaben sich lineare Beziehungen zwischen Bodenhelligkeit und OC-Gehalt. Der Aryl-C-Gehalt des Bodens war als einzige Humuskomponente signifikant mit der Bodenhelligkeit korreliert (rS = ,0.87). Der Aryl-C-Gehalt des Bodens bestimmt die Bodenhelligkeit schärfer als der OC-Gehalt. [source] Cupric ion enhanced molecular imprinting of bovine serum albumin in hydrogelJOURNAL OF SEPARATION SCIENCE, JSS, Issue 19 2009Sheng-Hua Li Abstract A novel molecularly imprinted hydrogel for bovine serum albumin (BSA) was prepared using cupric ion as the bridge between the template BSA and the functional monomer 4-vinylpyridine. N-Isopropylacrylamide (NIPA) was used as an assistant monomer to provide the stimuli-responsibility of the polymer. The adsorption conditions of BSA on the BSA-Cu(II)-imprinted hydrogel were optimized considering the influences of pH, temperature, and salt concentration. The proteins bound on the imprinted hydrogel can be easily recovered under mild conditions by using 10 mmol/L ethylene diamine tetraacetic acid (EDTA) (pH 7.0) containing 150 mmol/L NaCl as the eluting solution. The imprinting effect and adsorption capacity of the polymer were found to be significantly improved compared to the hydrogel prepared in the absence of cupric ion. The results demonstrated the advantages of using a template-metal ion-monomer coordination system to strengthen the interaction between the protein and monomer. The effects of different metals ions including Zn(II), Ni(II), Co(II), Cd(II), and Al(III) on the recognition ability of the BSA-Cu(II)-imprinted hydrogel were also investigated. The polymer showed high selectivity toward both the template protein and the cupric ion. [source] Resource management in open Linda systemsCONCURRENCY AND COMPUTATION: PRACTICE & EXPERIENCE, Issue 13 2003Ronaldo Menezes Abstract Coordination systems, in particular Linda, have established themselves as important tools for the development of applications to open systems such as the Internet. This paper shows how to tackle a forgotten, but crucial problem in open coordination systems: memory management. As with any system which intends to be of wide use and because memory is a finite resource, coordination systems must address the problems of memory exhaustion. This paper first explores the orthogonality between coordination and computation in order to make it clear that the problem of memory exhaustion in coordination systems cannot be solved using garbage collection schemes implemented at the computation language,a garbage collection scheme must exist in the coordination environment as well. Following the explanation on orthogonality, the paper will focus on describing a garbage collection scheme for the Linda family of coordination systems. It is expected that the solution in Linda can be adapted to other coordination systems as long as they are based on tuple space communication. Copyright © 2003 John Wiley & Sons, Ltd. [source] | ||||||||||