chromatography mass spectrometry to the analysis of lacquer film
Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 6
... Furthermore, liquid chromatography- atmospheric pressure chemical ionization- ion trap mass spectrometry, coupled to microwave-assisted extraction technique, was also been applied to analyze the ... better recoveries than SFE Liquid chromatography- atmospheric pressure ionization- ion trap mass spectrometry was used to investigate the chemical degradation behavior of N-methylcarbamate in environmental ... led to low recoveries The stability of propoxur under microwave irradiation was maintained as neither evaporation losses nor propoxur decomposition was observed during the process The extracts of...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 5
... of 0.02 s and a mass span of mass unit Quantitation was based on the area under the peak from the mass chromatogram of the above molecular ions at m/z 60, 151, and 210 For the LC separation of ... were to be considered, a total of five degrees of freedom was required, and the OA (2 7) matrix was, therefore, chosen so as to have sufficient degrees of freedom for the assignment of the variables ... probably because of the loss of a 1-propene (C3H6) molecule, the other is the base peak at m/z 153 [M+H-57]+, which probably resulted from the neutral loss of a CH3NCO group MS studies of other carbamate...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 4
... corresponds to the number of factors, and row number to the number of experimental trials The intersections between the columns and rows indicate the level settings that apply to those factors for the ... be responsible for the low recoveries of carbamates (propoxur, chlorpropham) due to the presence of water in the soil To examine the effect of time-aged soil on the recoveries of carbamates (propoxur, ... was then evaporated to dryness in a rotary evaporator 75 Finally, ml of methanol was added to dissolve the residue 10 µl of the solution was directly analyzed by HPLC In order to examine the thermal...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 3
... application of LC-APCI-MS for the determination of carbamates: carbofuran and 3hydroxy-carbofuran, and the analysis of triazine herbicides in water [8] LC-ESI-MS has been also successfully applied for the ... logarithm of the percentage of the compound remaining is plotted against time (h-1) The half-life (t1/2) designates the time at which the pollutant concentration is equal to one-half the initial ... This may be due to the lower polarity of TP 2, which makes it difficult to be ionized under the applied ESI conditions Furthermore, TP can be confirmed to be N-methyl formamide as the base 55 peak...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 2
... prepared via the addition of standard stock solutions to the homogenized specimen (30 g) that was then left for hour to allow the spiked 48 solution to penetrate the material The samples were then immediately ... volume of spiking solutions into the soils To ensure that the analytes were well distributed, a reasonable amount of acetone was added to moisten the soil and careful agitation was performed These ... Kingston, RI, USA) The stock standard solutions were prepared in acetone at concentrations of 2.0 mg/ml for each compound and stored at - 4°C Working solutions were prepared by diluting the stock...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 1
... removal of solvent prior to entering the MS [17] MB separates the condensed liquid-phase side of the LC from the high vacuum of the MS and uses a belt to transport the analytes from one to the other ... processes This is one of the most advantageous aspects of LC-MS in term of applicability to water treatment processes, as the analysis is no longer restricted to the monitoring of the parent compound, ... method of molecular analysis MS is based on the detection of emitted ions that have been separated or filtered according to their mass- to- charge (m/z) ratio The resulting mass spectrum is a plot of...
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Báo cáo khoa học: A novel mass spectrometric approach to the analysis of hormonal peptides in extracts of mouse pancreatic islets ppt
... insulin and [30] Masses corresponding to these two peptides were detected (Fig 1b) The masses of the two intense signals to the right in the spectrum (Fig 1c) matched those of the proinsulin-derived ... peptides The experimental masses agree well with the theoretical masses of the candidate peptides Mass measurement errors at the p.p.m.-level were typically observed Molecule Theoretical mass (Da) ... peaks were detected from the peptide assumed to be glucagon However, the theoretical mass of glucagon and the measured mass of the peptide differ by only 1.8 p.p.m In the ECD experiments, ECD...
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Tài liệu AN INTRODUCTION TO THE ANALYSIS OF ALGORITHMS pdf
... assumed to be larger than all the elements to the end of each of the auxiliary arrays, to help accomplish the task of moving the remainder of one of the auxiliary arrays back to a after the other ... compares to sort an array of N elements Proof If CN is the number of compares that the Program 1.1 uses to sort N elements, then the number of compares to sort the rst half is C⌊N/2⌋ , the number of ... rather we focus on the “machine-independent” parts of the analysis in this book Indeed, to determine the total running time of the program, it is necessary to study the branching structure of the...
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A Guide to the Analysis of Fish Marketing Systems Using a Combination of Sub-sector Analysis and the Sustainable Livelihoods Approach potx
... sub-sector Analysis of the structure of the commodity system usually focuses on the characteristics related to the Chapter number and size of firms in relation to the size of the market, the presence ... economic context of the subsector analysis For example, one of the objectives of the Bangladesh study was to investigate the link between the supply of loans and marketing arrangements in the commodity ... failing to meet their objectives this may be because of lack of assets or that their aims are in conflict with those of other, more powerful, groups One of the key principles of the SLA is the attempt...
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Báo cáo khoa học: "A SITUATION SEMANTICS APPROACH TO THE ANALYSIS OF SPEECH ACTS" ppt
... oair of sets of situation-types One gives the set of situationtypes of the text (written or spoken) st - and can be regarded as representing the Iocutionary aspect of the act The other gives the ... as in (6) The situation-type of the text at the end o f the utterance of the second clause includcs the speaker with die property of having told the guy at the door to watch out and having judged ... f the utterance: thc initial creation of the situation-type (the first clause), the interpretation of but and the modification of the initial situation-type to accommodate the information in the...
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an introduction to the analysis of algorithms 2nd edition
... assumed to be larger than all the elements to the end of each of the auxiliary arrays, to help accomplish the task of moving the remainder of one of the auxiliary arrays back to a after the other ... compares to sort an array of N elements Proof If CN is the number of compares that the Program 1.1 uses to sort N elements, then the number of compares to sort the rst half is C⌊N/2⌋ , the number of ... rather we focus on the “machine-independent” parts of the analysis in this book Indeed, to determine the total running time of the program, it is necessary to study the branching structure of the...
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Báo cáo hóa học: " Research Article Optimum Detection of Ultrasonic Echoes Applied to the Analysis of the First Layer of a Restored Dome" pot
... Finally, the vector s, which represents the form of the pulse to be detected, depends on the pulse arriving at the possible reflector, which, due to the propagation effects, is a distorted version of the ... allows us a total control of the work The study was made on a : scale model of the actual dome to overcome the problems of accessibility and the danger of damaging paintings A photograph of the : scale ... by using the optimum detector (9) In the following, we will consider the three optimum detectors for the problem in hand ANALYSIS OF THE FIRST LAYER OF A RESTORED DOME The research of this work...
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Báo cáo toán học: "EMILION, a tree functional-structural model: Presentation and first application to the analysis of branch carbon balance" pdf
... perpendicular to and in the direction of their woody axes are presented for two different shoots: (a) at the bottom of the crown and (b) at the top of the crown their maximal length: the assimilating ... foliage area of the shoot then begins to reduce as a consequence of needle fall The evolution of the internal geometry of the shoot coincides with a modification of the general orientation of the shoot ... in the annual production of axis and bud biomass In spite of this stabilisation, the respiratory cost of these tissues continued to rise The characteristics of the carbon components of all other...
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Báo cáo khoa hoc:" A quasi-score approach to the analysis of ordered categorical data via a mixed heteroskedastic threshold model" pdf
... (32) leads to: = = y Hence, the (i, i) blocks of the variance-covariance matrix of can be written as: The to the expression of the covariance calculated before can be easily generalized of two distinct ... 1) of iteration using the current value B(t! of where = 2.2.2 The GAR HTO + to round procedure The size (I(J — 1)) of the E matrix to invert in W may be very large in of applications (e.g ... function x,)/3 of explanatory variables (row vector xi’) with unknown coefficients /3 E IR !!zzzu* represents ; P the contribution of random effects to the model with u being a (q x 1) vector of * scaled...
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Báo cáo y học: "Dynamic simulation of red blood cell metabolism and its application to the analysis of a pathological condition" docx
... Figure The GSH/GSSG ratio of the prototype and expanded models The GSH/GSSG ratio of the prototype and expanded models The prototype model (A) and the expanded model (B) Page of 11 (page number not ... of the RBC was developed on the basis of the whole-cell model of Joshi and Palsson [8-11] with slight modifications (Figure 1) We modified the model to represent the oxidantinduced decrease of ... kinase, and the maximum activity of these enzymes was allowed to change according to the ratio of GSH and GSSG The equations and parameters used are derived from the literature [17] The parameters...
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Báo cáo sinh học: "A marginal quasi-likelihood approach to the analysis of Poisson variables with generalized linear mixed models" pot
... z’are the corresponding row incidence vectors, the parameterization in P being assumed to be of full rank Notice that [2] is an extension to mixed models of the structure of &dquo;linear predictors&dquo; ... equating the corresponding quasi-score function to zero, vix As shown by the expression in [3], the quasi-likelihood approach only the specification of the marginal mean vector and of the variance ... effects on the other hand A simple example of that is the classical animal model In (a2! ) x! p + +pi, for the jth performance of the ith female (eg ovulation rate of an ewe) as a function of = a...
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Development of hybrid PSTD methods and their application to the analysis of fresnel zone plates
... developed in this thesis improve the accuracy of the traditional PSTD method and preserve the efficiency of the PSTD algorithm They help to extend the application scope of the PSTD method to some practical ... in the scope of study in this thesis In the three hybrid PSTD methods developed in this thesis, only the application of PSTD-FDTD method is extended to the 3D problems The applications of the ... condition The other option is to analyze FZP problems using the full-wave numerical methods However, due to the large size of the FZP diffraction problem, the memory requirement of the traditional...
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An effective trajectory based algorithm for ball detection and tracking with application to the analysis of broadcast sports video
... transformed into ellipses in the video The ellipses we want to detect in this thesis are the projections of the central circle of the soccer field Most of these ellipses are only partial (due to the camera ... position and the lengths of the major and minor axes, i.e the paper assumed that the ellipse is horizontal The particle filter uses the contour and the histogram of the objects to differentiate the ball ... of candidate ball-like objects Then, in the second step, we use information of the path trajectories of these candidate objects over a short sequence of frames to obtain the ball (and prune off...
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Báo cáo y học molecular approaches to the analysis of deformed wing virus replication and pathogenesis in the honey bee, apis mellifera
... to RT-PCR to assess the sensitivity of the assay A) Amplification plots were generated by using seven serial dilutions of the RNA, ranging from 103 pg to fg per reaction as the template for the ... transmission of DWV and suggested that the lining of the digestive tract was likely the primary site of the DWV infection via food-borne transmission, with the virus spreading to secondary sites from the ... regulatory mechanism may exist to facilitate the viral replication These findings would stimulate further investigation to unveil the regulatory mechanisms that honey bees use to control the pattern...
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TECHNIQUES FOR THE ANALYSIS OF ORGANIC CHEMECALS BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP-MS) pptx
... avoiding the use of highly flammable or explosive gases in the laboratory The oxygen is added either in the spray chamber or using a T-connector before the torch When oxygen is added to the plasma, the ... procedure, provided that the operator has a clear view of the plasma A default flow of oxygen is added to the carrier gas flow (e.g Oxygen at 5% of the total argon carrier flow) and the organic solvent ... and, in the case of the sample uptake tubing, care must also be taken to avoid contamination of the sample through contact with the tubing material For routine analysis of organic solvents, the normal...
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