solid phase microextraction for the analysis of aromas and flavors
Liquid phase microextraction for the determination of acidic drugs and beta blockers in water samples
... liquid -phase microextraction There are several parameters that affect the performance of LPME, namely the pH of the aqueous solution, the type of the polymer-based hollow fiber and the type of organic ... favor of the deionization of analytes and to facilitate their distribution to the organic phase With the knowledge of the pKa value(s) of analytes would allow us to manipulate the acidity of the ... low viscosity of chloroform impeded the stability of the organic phase immobilized in the hollow fiber pores due to dissolution of chloroform in the midst of extraction n-Octanol was the only solvent...
- 74
- 277
- 0
Development of methods to improve sensitivity and portability of capillary electrophoresis for the analysis of stabilizers and drugs 1
... before sample injection to reduce the length of the concentrated sample zone and increase the peak height by slowing down the forward movement of the neutral sample associated with β-CD-NH2 and ... β-CD-NH2 and the backward movement of the neutral sample partitioned in the micelles of sodium dodecyl sulfate (SDS) Stability of the inclusion complexes formed between the carrier and the solute ... studies of many groups of compounds The improvement of sensitivity and the miniaturization of CE technique are two major trends of capillary electrophoresis which have gain more and more attention...
- 16
- 283
- 0
Development of methods to improve sensitivity and portability of capillary electrophoresis for the analysis of stabilizers and drugs 2
... presents one of the simplest and most effective means of influencing the EOF of the separation system Normally the EOF increases with decreasing buffer concentration and enables analysis of highly ... than the EOF as their velocity direction is the same as that of the EOF, so very rapid analysis times are therefore achieved with positively charged compounds The neutral compounds move at the ... So the viscous drag of the solvent and the charge and size of the solute thus control the migration of a species in an applied electric field The separation efficiency, normally expressed as the...
- 160
- 1,228
- 0
Tài liệu Báo cáo khoa học: A systems biology approach for the analysis of carbohydrate dynamics during acclimation to low temperature in Arabidopsis thaliana doc
... assessment of the trajectory of interconversion rates as a function of time of cold exposure, (b) comparison of the magnitudes of the various interconversion rates, and (c) lineup of the accessions ... photosynthesis, gas exchange of plants was measured by infrared gas analysis Measurements were performed during the first h 508 of the light phase, representing the time period of photosynthetic ... invertase activity The control of each assay was boiled for after addition of enzyme extract Reactions were incubated for 60 at 30 and °C, and stopped by boiling for min; the concentration of glucose...
- 13
- 707
- 0
TECHNIQUES FOR THE ANALYSIS OF ORGANIC CHEMECALS BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP-MS) pptx
... 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 ... analysis of the organic solvent is the preferred method of analysis, either untreated or simply diluted in a suitable solvent Direct organic solvent analysis demands some specific features and ... to the plasma, the plasma environment becomes considerably more reactive, and so the use of platinum-tipped interface cones instead of the standard nickel cones is recommended Optimization of the...
- 6
- 610
- 0
Báo cáo hóa học: " Analysis of in vitro replicated human hepatitis C virus (HCV) for the determination of genotypes and quasispecies" docx
... of each sample The numbers for the base positions that are reported here are the bases compared to the positions of the full length genome of HCV-N [44] Control HCV sequences for strains 1a and ... transmissions, and retransmissions of HCV JGP performed the clinical work, recruitment of patients, and procurement of specimens DR, MOA, RSB, DB, and NC performed the molecular work Acknowledgements The ... sequences of PCLB-T7, and 19 sequences from 081 serum were identical Five of the sequences from the 081 serum and eight from PCLB-T7 had one change from the consensus, while five of the PCLB-T7 and...
- 15
- 340
- 0
Báo cáo toán học: " Solid-phase microextraction for bioconcentration studies according to OECD TG 305" pdf
... substance They are then transferred to a medium free of the test substance for the depuration phase The concentration of the test substance in the fish is followed through both phases of the test ... consists of two phases: the exposure (uptake) and post-exposure (depuration) phases During the uptake phase, separate groups of fish of one species are exposed to at least two concentrations of the ... Without internal standardization, ageing of the SPME fiber is challenging, as is the variation of the MS performance Since a correction method for routine analysis is missing for MS, the alternative...
- 8
- 371
- 0
Báo cáo lâm nghiệp: "An approach for the analysis of vegetation spectra using non-linear mixed modeling of truncated power spectra" pdf
... reflectance in the visible yet reduced reflectance in the NIR and SWIR regions of the spectrum Analysis of vegetation spectra 519 Figure Summary of F-ratio tests of significance of the variance of the ... and tree effects In the eucalypt data they arise due to plot (site) and tree effects The expected power spectrum for a given group is one for which the random effects are zero Estimation of the ... where σ ijk (ϖ | ν k ) is the variance of the reflectance of the jth foliage sample in the ith group (treatment × foliage age for the balsam fir samples, and species for the eucalypt samples) at...
- 9
- 598
- 0
Báo cáo lâm nghiệp: "of morphological characters and molecular markers for the analysis of hybridization in sessile and pedunculate oak" pps
... means of the comparison of the RAPD marker frequencies of a subsampling of these progenies and of the adult population Analysis of the morphological characters MATERIALS AND METHODS Sampling The ... Morphological analysis In the second case of the figure, the heterozygote deficit (f) must be considered The frequency of the phenotype A+ is the sum of the frequency of the genotype P : +/+ All of the ... situated on the side of the species in the majority represented in the neighbourhood, the sessile oak The comparison of the mean values of the groups on the first axis of DFAa by means of the F-test...
- 13
- 404
- 0
Báo cáo y học: "In vitro model for the analysis of synovial fibroblast-mediated degradation of intact cartilage" pptx
... the induction of MMP-1 and MMP-3 in cartilage and SFB by TNFα and/ or IL-1β [42,43] Therefore, they support the validity of the new model for the analysis of the mechanisms of cartilage destruction ... supplemented FCS The MMP suggested on the basis of their known caseinolytic activity and the molecular weight of their latent and active forms were then identified by western blot analysis of the same ... may allow the testing/screening of the molecular basis and efficacy of new therapeutic strategies and thereby contribute to the improvement of anti-rheumatic therapy Competing interests The authors...
- 20
- 524
- 0
báo cáo khoa học: "Numerical techniques for the analysis of polygenes sampled from natural populations" ppsx
... on the other hand, is homozygous for the « high » allele (A All of the l ) l progeny from the standard cross have inherited the A allele from the father and are, therefore, heterozygous A The ... of 2.0, and the l other allele (A had no effect on the base phenotype of 10 The sampled population ) had allelic frequencies of A l A 0.5 A total of 25 isofemales were randomly sampled from the ... set of offspring therefore carries a limited sample of the genetic variation segregating in the original population If mating is at random with respect to the polygenic loci of interest, the...
- 20
- 337
- 0
Báo cáo y học: "A novel human ex vivo model for the analysis of molecular events during lung cancer chemotherapy" pptx
... responsible for the surgical part of the investigation CM and ARR carried out the LIFE/DEAD-assay and 2-photon microscopy PZ was involved in the design of the study, evaluation of the results and covered ... covered the clinical part EV was involved in the design of the study and histomorphological evaluation TG conceived the study and was involved in the evaluation of the data as well as the writing of ... viability and functionality of the cells Furthermore, specimens of breast cancer were also treated like the lung tumor samples to verify the efficiency of the used drug concentrations on the chosen...
- 11
- 573
- 0
Báo cáo y học: "ChIPOTle: a user-friendly tool for the analysis of ChIP-chip data" docx
... cutoff; and for option the user is prompted to provide the number of simulations and the significance P value cutoff to be used in the permutation analysis Any region with a P value lower then the ... width of portion of the peak above the significance cutoff, 'array density' of the peak, and the P value for that peak The array density value is defined as the average number of arrayed elements ... with which the user is comfortable The "Significant Negative Regions" sheet provides an empirical estimate of the number of false-positive findings for the selected P value cutoff, and so the user...
- 8
- 334
- 0
Báo cáo y học: "Statistical methods and software for the analysis of highthroughput reverse genetic assays using flow cytometry readouts" pps
... with the technical aspects of data import and management, and refer the interested reader to the documentation of the software package prada for a thorough discussion of these [19] Selection of ... cleaning up of the data, removal of systematic biases and drifts (a process often referred to as 'normalization'), and transformation to a format and scale that is suitable for the following analysis ... (SSC), and they measure cell size and cell granularity (the amount of light-impermeable structures within the cell) One of the fluorescence channels monitors emission from the YFP tag of the overexpressed...
- 12
- 424
- 0
Using biological networks and gene expression profiles for the analysis of diseases
... this case, the variances of the classes are pooled to compute the standard error, s2 and s2 denote the variance of the two classes respectively, N1 and N2 denote the sample size of the two classes ... Tk be the ordering of k genes sorted in increasing order of the modified t-statistic The permutation test randomly swaps the class labels of the original data, preserving the proportions of the ... microarray and the number of ways of sampling (n − k) non-DEGs in the pathway from (N − K) non-DEGs in the microarray, and the denominator is the number of ways of sampling n genes in the pathway...
- 147
- 703
- 0
An investigation into the use of gaussian processes for the analysis of microarray data
... if the class and the feature are independent, the value of mutual information is equal to zero Hence, the greater the values of information gain, the higher the correlation between a feature and ... as both the predictions of Gaussian Processes for Classification, (3.12) and ARD, (3.18) require the use of MCMC We will only discuss it briefly For details of MCMC, the theorems and proofs can ... interaction, single strands from targets and the single strand of the cDNA will combine and the targets will stick onto the immobilized probes, binding the targets to the microarrays In other words, such...
- 96
- 358
- 0
Capillary and microchip electrophoresis for the analysis of small biomolecules
... unsuitable for mass production because of the inherent serial nature of the system36 With the numerous benefits and the wide variety of substrates and techniques available for microfabrication of microchips, ... potential and η is the viscosity of the buffer The buffer parameters are affected by the composition of the buffer used, its pH as well as the type of organic additives introduced For instance, when the ... even after it is deformed by the application of external forces Hence, soft lithography technique is commonly utilized for the microfabrication of such microchips35 The design of the fluid circuit...
- 95
- 525
- 0
Hollow fiber protected microextraction for the determination of pollutants in complex matrices
... liquid form and permits the direct use of solid phase extraction materials in the analysis of solid samples 1.2 Scope of our project The main objectives of this work are to improve sensitivity of ... funnel for extraction and at the same time as a syringe for direct injection of the extract into a GC or GC-MS for analysis The main feature of this method was the use of smaller amounts of the ... enhancement of the partitioning of analytes from donor phase to acceptor phase; another is the introduction of salt These two functions can prevent the loss of the organic solvent acceptor effectively The...
- 79
- 290
- 0
QuEChERS A Mini-Multiresidue Method for the Analysis of Pesticide Residues in Low-Fat Products
... employ the internal standard at the end of the procedure (to an aliquot of the final extract) assuming the volume of the organic phase as being exactly 10 mL It should be furthermore noted that the ... lost The extent of losses depends on the amount of lipids in the sample as well as on the polarity of the analytes with the most non-polar ones showing the highest losses In the presence of elevated ... Mini-Multiresidue Method for the Analysis of Pesticides Page of 12 The pH-adjusted extract is filled into vials for gas- and liquid chromatography and is used for further analysis Annotations 6:...
- 12
- 729
- 0
Intrathecal baclofen for the control of spinal and supraspinal spasticity
... implanted for the relief of severe lower limb spasticity and flexor spasms The goals then are improved comfort and wheelchair posture, Intrathecal baclofen for the control of spinal and supraspinal ... the process of consideration for ITB Patients may hear about ITB and discuss the question with their therapists rather than their doctors The charting of range and function before and after a ... cord than in the brain because of the characteristics of the circulation of the CSF from the ventricles to the spinal subarachnoid space The effective distribution volume of intrathecally administered...
- 12
- 578
- 0
Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các nguyên tắc biên soạn khảo sát các chuẩn giảng dạy tiếng nhật từ góc độ lí thuyết và thực tiễn tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam khảo sát thực tế giảng dạy tiếng nhật không chuyên ngữ tại việt nam khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu xác định mức độ đáp ứng về văn hoá và chuyên môn trong ct phát huy những thành tựu công nghệ mới nhất được áp dụng vào công tác dạy và học ngoại ngữ mở máy động cơ lồng sóc mở máy động cơ rôto dây quấn các đặc tính của động cơ điện không đồng bộ hệ số công suất cosp fi p2 đặc tuyến hiệu suất h fi p2 đặc tuyến mômen quay m fi p2 đặc tuyến tốc độ rôto n fi p2 đặc tuyến dòng điện stato i1 fi p2 động cơ điện không đồng bộ một pha sự cần thiết phải đầu tư xây dựng nhà máy thông tin liên lạc và các dịch vụ phần 3 giới thiệu nguyên liệu