applications in the analysis of environmental samples

... [9, 10] In general, these sample preparation methods are expected to increase the concentration of compounds in the headspace of the urine samples by increasing the ionic strength of these samples, ... samples These methods result in a richer profile of VOCs, however, they may also add potential contaminants to the urine samples, result in increased variability introduced by manually processing the ... Page of 11 Fig. 1  Intensity of compounds present in the reference solution throughout the experiment A stock of reference solution was prepared at the beginning of the experiment A 2 ml sample of...

Ngày tải lên: 29/05/2020, 13:33

... nature of environmental change in the southern Lahontan Basin of western Nevada during the past 15,000 years or so Part of this effort involved the analysis of pollen and plant macrofossils from the ... substantial these objections are, the other common quantifier of taxonomic abundance must be addressed THE MINIMUM NUMBER OF INDIVIDUALS 27 The Minimum Number of Individuals The potential effects of interdependence ... conducted the details of her study: as a preliminary to the study of a species, individual specimens were marked in Indian ink with the name of the cave and of the Level from which they came...

Ngày tải lên: 17/02/2014, 20:20

... Re-evaluation of the discordant cases: a 303: Using the Ventana IHC protocol the staining of the tissue core was annotated as positive (strong staining in % of the tumors cells) The corresponding whole ... staining in 1–50 % of the cancer cells) but these were annotated as negative with the Dako protocol (weak to moderate staining in 1–30 % of the cells, below our defined cut-off ) One of the four ... any protein expression The Dako protocol was negative on both the TMA and the whole section The FISH analysis was also negative b L694: Using the Ventana IHC protocol the staining of the tissue...

Ngày tải lên: 20/09/2020, 15:18

... licensing settlements, demonstrate the best way of regulatory reform That is, bringing in the stakeholders at an early point, identifying the issues, discussing the issues with them, and working ... published in the EMV, notice availability of guidance to be published in the EMV, which I think is a great step of allowing the public to be informed and making sure that they participate in the process ... was sitting out there listening to Professor Robinson extol the writings of Rachel Carson, Thoreau, and all the rest It was always an important component of Professor Robinson's, Dean Ottinger's,...

Ngày tải lên: 26/10/2022, 16:16

... determined using point interpolation methods [14, 15] Step Establish the distance function 𝛿 along either boundary line The point is not in contact when 𝛿 > TOL Otherwise, the point is in contact ... simulating the displacement jump along the interface: the interface element, thinlayer element, and contact analysis methods The interface element method originated from the Goodman joint element ... the thin-layer element and interface element methods because they used element information to determine the separation The opening depth was the depth of the tensile stress zone, and the opening...

Ngày tải lên: 01/11/2022, 09:06

... CSA Finally, the conditional statistical power of each of the three methods of analysis was calculated as the percentage of rejections of the null hypothesis in the 1000 simulations within each ... power of these three methods in relation to a wide range of combinations of different levels of experimental conditions, including baseline imbalance in the outcome variable, that are typical of ... difference in the estimate of treatment effect by these methods The magnitude of this difference depends on the degree of ZY correlation and the size of baseline imbalance At a given level of baseline...

Ngày tải lên: 02/11/2022, 08:56

... vegetation present in the bordering areas can be affected in the event of the spread of flames, and the vegetation of the caatinga is more susceptible to burning in periods of drought in the region 4.2.3 ... understandable analysis of the hazards involving the operation and decommissioning of the ESS, listing the possible causes of the identified events, the prevention barriers, the mitigation barriers and the ... located in the Northeast of Brazil The applied methodology involved two techniques: the Bow Tie method, for the analysis of environmental risks, and the Interaction Matrix method, for the analysis of...

Ngày tải lên: 11/10/2022, 16:19

... ones, etc under the impacts of human activities and natural hazards The studied results on the initial analysis of these indicators in the coastal waters of Quang Ninh-Hai Phong show the critical ... application of these indicators for quantitative assessment of the change of these ecosystems indicates a substantial step towards a set of indicators for the evaluation of coastal management in Vietnam ... Nam ANALYSIS OF ENVIRONMENTAL AND ECOLOGICAL INDICATORS FOR SUSTAINABLE UTILIZATION AND MANAGEMENT OF MARINE RESOURCES: - Case study in the coastal waters of Quang Ninh – Hai Phong Tran Dinh...

Ngày tải lên: 27/02/2024, 08:12

... a mass of facts into a handful of meaningful num- bers that signal whether environmental problems are getting better or worse. The authors acknow- ledge the work of others laboring in the field— not ... assuming that the depletion of natural resources is sustainable if their use leads to the creation of other assets of equal value In the language of the economics of ... only with the industry's active participation and involvement—owed in large part to the visibility of the environmental indicators and the "transparency" of the information...

Ngày tải lên: 15/03/2014, 16:20

... copies of the same LAGLIDADG motif [7,8,13], reviewed in [7]. Intron-encoded DNA endonucleases catalyze the mobi- lization of their cognate intron (or intein) into the equivalent exon sequence of intron-less ... release of the cleavage products from the protein. The amplitudes of the initial burst (2.78 and 2.83 n M ) gave a ratio of DNA/protein of 0.94 : 1. As will be discussed further, these data indicate ... available within <0.5 min (j,Fig.6B). To estimate the amount of free protein in the above experiment, we determined the rate at which the pCOBLE DNA inhibitor dissociated from the protein using a nitrocellulose...

Ngày tải lên: 17/03/2014, 10:20

... Dividing the induced GVA for each of the three factors of production by their column sum results in measures of factor intensity that indicate whether the income induced by the components of final ... computed as the ratio of the sum of the elements of a column of the Leontief inverse to the average of the whole system This ratio is described by Rasmussen (1957) as the index of the power of dispersion, ... which use the inputs supplied by the industry concerned A forward linkage can be expressed as the ratio of the sum of the elements along a row of the Leontief inverse to the average of the entire...

Ngày tải lên: 22/03/2014, 13:20

... studies in the area, it was decided to evaluate the positioning of the students, since they are the ones most actively interested in the completion of their education Thus, the following question ... self-effectiveness in the use of the Marketing knowledge and tools for students of this discipline The proposition by Slack, Chambers and Johnston (2002), pointing out the main abilities of professionals of the ... area The data of the constructs were also submitted to the technique of cluster analysis, as a means of grouping respondents according to their positioning in the set of constructs analyzed in the...

Ngày tải lên: 23/03/2014, 05:22

... Q7QKF0) where the Asp235 is missing In this latter case, the absence of the Asp235 can be explained in the light of the model of the interaction of the substrate with the active site (vide infra) It ... upstream amino acyl or peptidyl moiety tethered to the phosphopantetheinyl group and the free amino group of the downstream aminoacyl moiety, thus facilitating the translocation of the growing chain ... On the basis of the assumption that the nine amino acids lining the binding pocket determine substrate specificity [11], we used maximum parsimony method implemented in the program protpars of the...

Ngày tải lên: 23/03/2014, 13:20

... transition: the rapid ageing of the inhabitants of the industrialised world, accompanied by a diminishing number of young people Figures in the Green Paper on Demographic Change launched by the Commission ... research and an analysis of this information in the context of ICT-enabled independent living All these findings have been collected in a database, on which all analyses presented in the successive ... - University of Belgium (BE) Stirling ff The University of Edinburgh ff The University of Liverpool ff The University of Reading ff The University of Sheffield ff The University of Ulster ff...

Ngày tải lên: 28/03/2014, 16:20

... concentrations of organic substances in the aqueous environment has been a matter of increasing interest to the water industry, scientists and the general public alike, from the point of view of possible ... While the kinetics of the process were not described in detail, the importance of convective transport of analyte was highlighted The advantages of the drop-indrop system include low consumption of ... aspiration of the ASP, following the first sampling cycle, ensures that both the OF and the ASP are periodically renewed, and thus the OF would be in contact with fresh aqueous sample having the initial...

Ngày tải lên: 17/09/2015, 17:20

... optimization of the MAE conditions To apply these techniques in practical applications, in this chapter I 138 demonstrated the application of these techniques in analysis of the residues of Nmethylcarbamate ... Fig 5-4 shows the change in concentration of each of the analytes in the goldfish extracts with time From the figure, it can be seen that neither a decrease in the concentration of the extracts ... not considered was the power setting for the microwave heating This setting was proportional to the number of samples undergoing extraction during one run Furthermore, according to previous experience...

Ngày tải lên: 16/09/2015, 17:13

... increased to 200°C at a rate of 25°C/min, then maintained at 200°C for min; a second ramp 230°C at rate of 5°C/min, increased to 280°C at a rate of 20°C/min; The final temperature of 280°C was held for ... 88 An interesting result observed from Fig 4-6 is that in the same solvent, the recovery increases in going from PAHs to PCBs, and then to triazines (i.e, increasing polarity of analyte) The recovery ... direct extension of 2-level OAD with the added capability of providing information about the non-linearity of the main factors in the response surface However, the method as described in a work by...

Ngày tải lên: 16/09/2015, 17:13

... k is the first-order rate constant, which is calculated as the negative slope of the regression line where the natural logarithm of the percentage of the compound remaining is plotted against ... 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 ... light intensity increases in the order of darkness, indoor lighting and sunlight This indicates that light exposure can prompt hydrolysis in various types of natural water Thus the effect of light...

Ngày tải lên: 16/09/2015, 17:13

... In almost all cases higher recoveries were obtained from the spiked samples, demonstrating the effect of the stronger binding to the matrix in native samples [77] Furthermore, in many cases the ... principle of MAE The principle of MAE is based on heating the extractants (mostly liquid organic solvents) in contact with the sample with microwave energy [58] Partitioning of the analytes of ... microwave-absorbing properties of the solvent, the interaction of the solvent with the matrix, and the analyte solubility in the solvent Preferably, the solvent should have a high selectivity towards the...

Ngày tải lên: 16/09/2015, 17:13

... cathode The migration of cations results in the migration of whole buffer solution through the capillary; this migration is the EOF Since the driving force of EOF is uniformly distributed along the ... used in both the conviction of guilty offenders and the appraisal of the consanguinity Amino acids, peptides and proteins Proteins are very important to life, the complex molecules of proteins ... numbers), the number of double bonds and also the exact position of these double bonds, this will define the biological reactivity of the fatty acid molecule and even of the lipid containing these...

Ngày tải lên: 11/09/2015, 14:27