selection of the solid phase microextraction fiber

... alternative The fact that the values determined for the intercepts are close to the respective EEVs of the tickets supports the use of the S-model in representing the aggregate behavior of buyers in the ... measure of value Use of the intercept as a phenomenological measure of the value of the product is also intuitive in the absence of the S-model The use of V±P as a measure of the driving force for ... the customer to the needs of the manufacturer and the loop on the left connects the needs of society to the needs of the manufacturer A necessary but not suf®cient condition for the manufacturer...

Ngày tải lên: 16/03/2014, 11:20

... Fig.8 The Fig shows the constancy of the output dc-voltage (Vs = 0.495 V) when the amplitude of noise reaches 5V Similarly, we record the dependence of the phase shift on the amplitude of noise ... VNU Journal of Science, Mathematics - Physics 24 (2008) 239-244 243 The development of the amplitude and the phase shift according to the noise level Noise (V) Fig The dependence of the output ... If we take the average of the measured data, we can obtain the more accurate result Noise (V) Fig The dependence of the phase shift on the noise level Conclusion The implemented two -phase lock-in...

Ngày tải lên: 22/03/2014, 11:20

... out of the port of Palos, on the coast of the Gulf of Cádiz in southern Spain, not far from the modern city of Huelva The party reached the Canary Islands on August  and departed from there ... distances, in their case by sea, where they were often out of sight of land for days at a time Their landmarks were in the sky and on the sea The shape and direction of clouds, the position of the Sun, ... at the center of the circle A plumb line hangs from the center The person using the instrument first makes sure that the plumb line hangs vertically, down the center of the vertical arm of the...

Ngày tải lên: 29/03/2014, 04:21

... stand, or another form of coordinated operation Consequently, we shall not consider this element of the program in the analysis The fourth goal of the program is to improve the income of the taxi ... in models of so-called “rational scrappage”, where the optimal decision of the owner to keep or scrap the vehicle is based on the minimization of the present value of the costs from the two alternatives, ... consideration of the enforcement mechanisms needed to replace almost 80% of the taxi fleet in the Federal District Yet, there is some confusion in the official perception of how the taxi substitution...

Ngày tải lên: 29/03/2014, 14:20

... Pawliszyn, In vivo sampling with solid phase microextraction, Journal of Biochemical and Biophysical Methods, 70 (2007) 181193 Pragst, Application of solid- phase microextraction in analytical toxicology ... N Y.), 275 Ulrich, Solid- phase microextraction in biomedical analysis, Journal of Chromatography A, 902 (2000) 167-194 L.J.Krutz, S.A.Senseman, A.S.Sciumbato, Solid- phase microextraction for ... M., Zhang, Z., Pawliszyn, J., Solid- Phase Microextraction: An Attractive Alternative, Environmental Lab.11 (1992) 10-15 Pawliszyn, J Solid Phase Microextraction : Theory and Practice (1997) Publisher:...

Ngày tải lên: 02/05/2014, 23:00

... fish of one species are exposed to at least two concentrations of the test substance They are then transferred to a medium free of the test substance for the depuration phase The concentration of ... concentration of the test substance in the fish is followed through both phases of the test Where possible, the BCF is calculated preferably both as the ratio of the concentration in the fish and in the water ... characterizing the bioconcentration potential of substances in fish The test consists of two phases: the exposure (uptake) and post-exposure (depuration) phases During the uptake phase, separate groups of...

Ngày tải lên: 20/06/2014, 20:20

... 0; the DPL model reduces to the single -phase lagging (SPL) model [3] The time delay tq is interpreted as the relaxation time due to the fast-transient effects of thermal inertia, while the phase ... established within the medium can still precede the heat flux The application of the heat flux at the boundary does not guarantee the precedence of the heat flux vector to the temperature gradient ... gradient at all In fact, whether the heat flux vector precedes the temperature gradient or not depends on the combined effects of the thermal loading and thermal properties of the materials, as was...

Ngày tải lên: 21/06/2014, 04:20

... A-peroxidase reaction allowed the visualization of 15 stigmatic and pollinic glycoproteins according Differences to the glycoprotein type of increases were observed, distinct in the compat- cross: one ... increase of its activity (one isoenzyme of isoelectric point about pH 4.2) from 6-20 h after pollination was detected only in the compatible cross Conclusion The compatible progamic phase nigra, ... divergence could likely be related to a change in the physiology of the compatible pollen tube, shifting from an autotrophic to a heterotropic type of nutrition callose Biochemical studies focused...

Ngày tải lên: 09/08/2014, 04:20

... to the authors of such articles, one should also consider the publication of the recalculated data These data can be used to improve our dose-effect models, which aid the further improvement of ... based on the internal target volume (ITV) concept or the time-averaged mean position of the tumour PTV based on the ITV concept For 4D CT scans, the ITV can be derived from the union of GTV delineations ... inspection of the projected ITV contours on the CT-datasets of the end-inspiration and end-expiration phase bins using axial, sagittal and coronal views In addition to the MIP contouring, the GTV...

Ngày tải lên: 09/08/2014, 09:22

... oligomerization of pro-caspase results in its autocatalysis and/or activation, and the induction of the degradative phase of apoptosis through the activation of caspases and [23] An additional pathway of ... of Bcl2/Bcl-xL or by the complete ablation of Bax and Bak [22] Materials and methods The induction of apoptosis mediated by the extrinsic pathway is initiated by binding of death ligands to their ... 0.03) in the number of macrophages compared to Wt ankles More specifically, there was a 2.5-fold increase (p < 0.02) in the number of macrophages in the pannus of Bid-/compared to Wt joints There...

Ngày tải lên: 09/08/2014, 10:20

... EFV monotherapy at the time of therapy interruption selected the K103N mutation, which persisted as the prevalent quasispecies for over years of continual viral replication, in the absence of selective ... Baseler M, Coffin J, Fauci AS: A proof -of- concept study of short-cycle intermittent antiretroviral therapy with a once-daily regimen of didanosine, Lamivudine, and efavirenz for the treatment of chronic ... case therefore suggests that the presence of the K103N mutation should be ruled out even after minimal exposures to EFV, reinforcing at the same time the need for a systematic evaluation of GRT...

Ngày tải lên: 11/08/2014, 14:21

... sequence tag) sequence with the PRIMER software [16] The selection of ESTs from the CGPDB database [17] was based on their position in the genome - only ESTs previously mapped to the linkage group were ... with two of them These two markers are based on ESTs Cntg4252 and Cntg10192 Besides the two co-segregating markers; another six markers were located within cM of the resistance gene These markers ... markers, SNP position in the marker, the p-value of association, the percent of phenotypic variation explained by the SNP (R2 %), and SNPs from the same tag SNPs with a p-value of ≤ 0.005 are shown,...

Ngày tải lên: 12/08/2014, 03:21

... materials of which the composite is made, the arrangement of the primary load-bearing portion of the composite (reinforcing fibers), and the interaction between the materials (fibers and matrix) The ... constructed, the arrangement of the primary load-bearing reinforcing fiber portion of the composite, and the interaction between these materials The major factors affecting performance of the fiber ... resin matrix, and the adhesion of the bond between the fibers and the matrix 2.2 The importance of the polymer matrix Most published composite literature, particularly in the field of composite reinforced...

Ngày tải lên: 24/10/2014, 17:25

... be the aspect ratio of the fibers, the volume percentage of fibers, the maximum size and gradation of the aggregates, and the method of adding the fibers to the mixture As the first three of these ... the aggregate used in the mixture, the aspect ratio of the fibers, the volume fraction, the fiber shape, and the method of introducing the fibers into the mixture The larger the maximum size aggregate ... diameter—Diameter of a circle with an area equal to the cross-sectional area of the fiber See “SNFRC Terms” for the determination of equivalent diameter Fiber count The number of fibers in a unit volume of...

Ngày tải lên: 24/10/2014, 22:12

Ngày tải lên: 14/11/2014, 09:52

... understanding of the SPC process In Chapter 2, a review of the current understanding of the SPC process will be discussed and therein the theoretical framework for the remainder of the Thesis will ... distinct from the other parts of the system The reason why phase transformation occurs is because the initial phase is unstable relative to the final phase The phase stability is determined by the Gibbs ... liquids and solids, the term and hence in the case of SPC, is the volume In is very small compared to The internal energy of the system consists of the kinetic and potential energy of the system...

Ngày tải lên: 10/09/2015, 09:31

... analyte in the organic phase, and Aa’ is the analyte in the acceptor phase in membrane-based microextraction Accordingly, the amount of analytes in the organic phase and the aqueous phase should ... remove the excess organic solvent from the inside of the fiber; thirdly, the acceptor solution (aqueous) was introduced; and finally the hollow fiber was placed in the sample The advantages of LLLME ... repeated movement of the syringe plunger When the plunger was withdrawn up, a solvent film was generated on the inner wall of the syringe The analytes in the aqueous phase partitioned into the film quickly,...

Ngày tải lên: 16/09/2015, 17:11

... Flow of mobile phase through the particle packed column depends on the permeability of the packed bed This permeability is based on the size of particles and their distribution along with the ... and chromatography The main concern for the encapsulation of the biomolecules within the confines of the silica matrix is the ability to retain their activity and function in the environmental ... dealt with the solid phase extraction and this thesis is dedicated to explore the potential of monolith as a solid phase extraction cartridge Chapter 24 1.6 MONOLITH: AS A SOLID PHASE EXTRACTOR...

Ngày tải lên: 10/09/2015, 15:50

... the microsyringe was inserted into the 2.0-cm length of hollow fiber Then, the acceptor solution was introduced into the fiber To fill the pores of the fiber, the fiber was then immersed in the ... from the hollow fiber by the syringe pump The repetitive movement of acceptor phase into and out of the hollow fiber channel facilitated the transfer of analytes into acceptor phase, from the ... stagnant acceptor phase [56] The other is based on the hollow fiber with a stirred donor phase and a stagnant acceptor phase within the 14 lumen (channel) of the hollow fiber Taking the latter mode...

Ngày tải lên: 12/09/2015, 08:20

... Va1 is the volume of donor solution (sample), Vo is the volume of organic solvent in the pores of the hollow fiber, and Va2 is the volume of acceptor solution inside the hollow fiber The enrichment ... conditioning of the fiber, some bleeding of the stationary phase is observed Another problem is that the fibers of SPME are very fragile and can easily be broken When applied to “dirty samples”, the fiber ... is the equilibrium concentration of i in the organic phase, Ca1,eq is the equilibrium concentration of i in the donor phase, and Ca2,eq is the equilibrium concentration of i in the acceptor phase...

Ngày tải lên: 17/09/2015, 17:20