chemical explorations of interfacial compositions of cationic micelles

... incorporation of the product into reactive region of the CTAB micelles To determine the effect of CTAB micelles on the reaction rate, the kinetic experiments were performed in the presence of varying ... 2.4 4.5 Plots of ΔA310 nm versus mole fraction (x) of ninhydrin 75 4.5 6.8 for determination of the composition of the product formed by 80 5.1 9.4 2.0 Fig.3 2+ the interaction of [Cr(III)-Gly-Gly] ... determine the composition of the reaction product formed, Job′s method of continuous variations was employed in the absence and presence of micelles The stoichiometry of the complex formed was...

Ngày tải lên: 02/09/2015, 13:12

... (lightness of color) and b* (yellowness of color), with an increase in a* (redness of color) Similar results were also reported by Ganesan et al (2005) Table The Effect of the Rate of Solubles ... color Corn-sorghum blends of DDGS are also somewhat darker in color than corn DDGS because of the bronze color of many sorghum varieties When a relatively high proportion of solubles are added to ... they evaluated color in batches of DDGS where approximately 0, 30, 60 and 100% of the maximum possible of syrup was added to the mash before drying Actual rates of solubles addition to the mash...

Ngày tải lên: 08/08/2012, 10:03

... their knowledge of the identities and quantities of pollutants and other chemical species in water, air, soil, and biological systems Therefore, proven, state -of- the-art techniques of chemical analysis, ... 24 CHEMICAL ANALYSIS OF WATER AND WASTEWATER 24.1 GENERAL ASPECTS OF ENVIRONMENTAL CHEMICAL ANALYSIS Scientists’ understanding of the environment can only ... period in the evolution of analytical chemistry, characterized by the development of new and improved analysis techniques that enable detection of much lower levels of chemical species and a vastly...

Ngày tải lên: 23/07/2013, 20:57

... member of American Oil Chemist Soceity and Institute of Food Technology She is a current Ph.D candidate Yaser Dahman holds a Ph.D in Chemical and Biochemical Engineering from the University of Western ... care industry, mainly in the field of developing and testing of novel wound dressing materials for chronic wounds He is currently a professor in the Department of Chemical Engineering at Ryerson ... reesei with the enzyme activity of 700 IU/g, and Novozyme 188 is composed of Cellobiase from Aspergillus niger with the enzyme activity of 250 IU/g The effect of temperature was examined where...

Ngày tải lên: 05/09/2013, 15:28

... discussion The essential oil was light yellow and the total yield of 1.23% The chemical composition of the leaf essential oils of investigated species collected in October 1991 and 2007 were not ... oil of investigated species from Vietnam was characterized by large amount of α- and βphellandrene (70.7%) and the ratio of αphellandrene and β-phellandrene was 5.73 Table The composition of leaf ... research from the Ministry of Science and Technology of Vietnam, code 50 63 06 References [1] N.X Dung, P.V Khien, Essential oils of wood, root, flower, and fruit of camphor tree, Pharmaceutical...

Ngày tải lên: 12/02/2014, 17:20

... analysis of a QC check standard will depend upon the number of parameters being simultaneously tested, the complexity of the sample matrix, and the performance of the laboratory If the entire list of ... collection of a minimum of 250 mL of sample Sample containers must be kept refrigerated at 4°C and protected from light during compositing If the sampler uses a peristaltic pump, a minimum length of ... minimum of three concentration levels for each parameter of interest by adding volumes of one or more stock standards to a volumetric flask and diluting to volume with acetonitrile One of the...

Ngày tải lên: 14/02/2014, 03:20

... dilution standard be prepared at a concentration of 15 µg/mL of each internal standard compound The addition of 10 µL of this standard to 5.0 mL of sample or calibration standard would be equivalent ... responsible for maintaining a current awareness file of OSHA regulations regarding the safe handling of the chemicals specified in this method A reference file of material data handling sheets should also ... quality control program The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data...

Ngày tải lên: 14/02/2014, 03:20

... various aspects of OFETs, including the synthesis of new materials, preparation and characterisation of organic thin films, characterisation of device properties and the development of new device ... Organic Electronics Structural and Electronic Properties of OFETs Edited by Christof Wöll WILEY-VCH Verlag GmbH & Co KGaA The Editor Prof Dr Christof Wöll Lehrstuhl für Physikalische Chemie I der Ruhr-Universität ... CNT-FETs Based on Electrochemical Field-Effect 572 Role of Capacitances 573 Chemical Functionalisation 575 Motivation and Strategies 575 Chemically Modified Devices 576 Electrochemical Functionalisation...

Ngày tải lên: 16/02/2014, 19:20

... amide chemical shifts of residues 52–63 were virtually unaffected by the presence of DPC micelles 6562 B C D Fig (A) 1H-15N-HSQC spectra of VpUcyt in the presence (red) and absence (black) of micelles ... 39–81 of VpU The dotted lines mark the theoretical average values of the downfield shift of 13Ca (top) and 13CO (bottom) as well as of the upfield shift of 1Ha resonances (middle) characteristic of ... tertiary fold of VpUcyt in the presence of DPC micelles 2D 15N-edited NOESY spectra of VpUcyt recorded with and without DPC micelles in the sample were very different (Fig 4) The number of cross-peaks...

Ngày tải lên: 18/02/2014, 06:20

... WebObjects, in part because of EOF, cut the development time needed to create complex web applications by an order of magnitude In addition to being part of WebObjects, EOF was also used by NeXTSTEP, ... instance of NSDate If you want to set a new value for a date attribute, you need to provide an instance of NSDate to so A string attribute corresponds to an instance of NSString, and most of the ... without impacting any of the other code you write by tweaking a single line of code We’ll show you the actual line of code to change in a few moments Caution  Do not change the type of persistent store...

Ngày tải lên: 20/02/2014, 02:20

... strain 6BC, the chemical structures of which are already known [12,13] The negative ion MALDI-TOF mass spectrum of the native LPS (Fig 1) exhibited a complex pattern of several groups of ion peaks ... dissolved at a concentration of  20 ngÆlL)1 in 2-propanol/ water/triethylamine in a ratio of : : 0.01 (v/v/v) and sprayed at a flow rate of lLÆmin)1 MALDI-TOF MS of LPS and free lipid A were ... and of laser-induced fragment ions [18] representing the lipid A moiety of LPS (centered around m/z 1850, 1641, and 1347) The mass difference of D m/z 660 between the respective groups of ions of...

Ngày tải lên: 20/02/2014, 23:20

... different VOC in the formation of secondary organic aerosol (Watson et al., 2001) The speciation of VOC emitted from motor vehicles reflects the chemical composition of the fuel consumed, with additional ... emissions and found that the composition of the emitted VOC was best described as a 50-50 mix of liquid gasoline and headspace vapor compositions The speciation of VOC emissions from on-road motor ... end of 2003, blending of MTBE and other ethers in California gasoline had been banned, and refiners switched to ethanol as a fuel oxygenate where one was needed A summary of the evolution of Bay...

Ngày tải lên: 05/03/2014, 20:20

... 15-40% of Mass 95 30-60% of Mass 95 Base Peak, 100% Relative Abundance 5-9% of Mass 95 50% of Mass 95 5-9% of Mass 174 >95% but 101% of Mass 174 5-9% of Mass 176 Table ... analysis of a QC check standard will depend upon the number of parameters being simultaneously tested, the complexity of the sample matrix, and the performance of the laboratory If the entire list of ... 10 µL of this solution of mL of sample or standard is equivalent to a concentration of 30 µg/L of each surrogate standard 6.8 BFB Standard—Prepare a 25 µg/mL solution of BFB in methanol 6.9 Quality...

Ngày tải lên: 05/03/2014, 21:20

... example of the separations achieved by this column is shown in Figure 12.9 Calibrate the system daily with a minimum of three aliquots of calibration standards, containing each of the phenols of interest ... collection of a minimum of 250 mL of sample Sample containers must be kept refrigerated at 4°C and protected from light during compositing If the sampler uses a peristaltic pump, a minimum length of ... minimum of three concentration levels for each parameter of interest by adding volumes of one or more stock standards to a volumetric flask and diluting to volume with 2-propanol One of the external...

Ngày tải lên: 05/03/2014, 21:20

... of MeHg+ to Zn7-MT would enable them to induce the synthesis of more protein, in agreement with the function of Zn(II) as primary inductor of the synthesis of MT [32,33] High concentrations of ... recorded after addition of the first MeHg+ eq to Zn7-MT (Fig 1D), Zn4-aMT (Fig 2D) and Zn3-bMT (Fig 3D), is indicative of the loss of Zn(SCys)4 chromophores and thus of the removal of Zn(II) from the ... analysis of the CD and UV-vis spectra recorded during the titration of Zn7-MT (Fig 1), Zn4-aMT (Fig 2) and Zn3-bMT (Fig 3) with MeHg+ reveals that the behavior of these proteins in the presence of...

Ngày tải lên: 07/03/2014, 15:20

... modes of action Variations in the properties of antimicrobials within a class often arise as a result of the presence of different sidechains of the molecule, which confer different patterns of ... plasmid-mediated mechanisms of resistance to nitrofurantoin occur, and these most commonly involve the inhibition of nitrofuran reductase Following the administration of safe doses of nitrofurantoin, effective ... of the drug, even to the point of loss of activity.6 In the case of antimicrobial drugs, it was the work of Ehrlich in the early 1900s that led to the introduction of molecules selectively toxic...

Ngày tải lên: 11/03/2014, 03:20

... responsible for maintaining a current awareness file of OSHA regulations regarding the safe handling of the chemicals specified in this method A reference file of material data handling sheets should also ... collection of a minimum of 250 mL of sample Sample containers must be kept refrigerated at 4°C and protected from light during compositing If the sampler uses a peristaltic pump, a minimum length of ... minimum of three concentration levels for each parameter of interest by adding volumes of one or more stock standards to a volumetric flask and diluting to volume with mobile phase One of the...

Ngày tải lên: 14/03/2014, 20:20

... the safe handling of the chemicals specified in this method A reference file of material data handling sheets should also be made available to all personnel involved in the chemical analysis ... collection of a minimum of 250 mL of sample Sample containers must be kept refrigerated at 4°C and protected from light during compositing If the sampler uses a peristaltic pump, a minimum length of ... a minimum of three concentration levels for each parameter of interest by adding volumes of one or more stock standards to a volumetric flask and diluting to volume with hexane One of the external...

Ngày tải lên: 14/03/2014, 20:20

... presentation of aspects of this work at several gatherings of the Society for the Contemporary Assessment of Platonism, which sessions occurred at conventions of the Pacific Division of the American ... knowledge of the properties of these elements and of other such candidate materials This lack of knowledge does not permit reasonable spec- Introduction ulation on the chemical nature of what our ... Students of Plato’s Republic might recall here the brevity of Plato’s sketch of the implementation of his grand scheme (540d–541), indicative of his worries in this matter The very possibility of such...

Ngày tải lên: 15/03/2014, 19:03

... 12:40 pm Page 24 Chemical partitioning of heavy metal contaminants in sediments of the Pearl River Estuary Figure The chemical partitioning (operationally defined geochemical phases) of Cu in top ... different chemical forms of heavy metals and their spatial distribution in the sediments of the Pearl River Estuary using sequential chemical extraction procedure In order to assess the impacts of different ... partitioning in sediments The results of sequential chemical extraction of the top sediments are summarised in Table The concentration of total Zn in the top layers of sediments was the highest among...

Ngày tải lên: 15/03/2014, 23:22