derivatization reactions for gas chromatographic determination of n nitrosamines

... and ELISA analytical techniques were used for the quantification of this kind of substances in EBC Determinations of inflammatory markers in EBC with ELISA could only be done for one substance ... Table and were performed with continuous flow injections of standard solutions of all analytes with a Page of (page number not for citation purposes) Journal of Occupational Medicine and Toxicology ... analytical column, both RAM and analytical column were washing with 100% solvent B before reconditioning for the next run Optimization of the chromatographic separation of the analytes was necessary...

Ngày tải lên: 20/06/2014, 00:20

... information cannot be obtained from conventional achiral analysis However, to our knowledge, there was the only one published information available on the transformation and degradation of the enantiomers ... developed for the determination of concentrations of organophosphate pesticides including acephate and methamidophos in water, soil, sediment and plants The concentrations of the total organophosphate ... sensitive determination of acephate and other organophosphate pesticides by using 5% acetone in hexane as extracting solvent and 1-chloro-4-fluorobenzene as an internal standard in fruits and...

Ngày tải lên: 02/09/2015, 13:47

... experiments for resonance assignments of large proteins NMR experiments provide a set of unique combinations of neighboring resonance spin system information for resonance assignment But these approaches ... structure determination is the spectral assignment procedure This involves sequence-specific resonance assignment of NMR signals and the assignment of NOESY spectra Resonance assignment forms the ... Cai-1-Coi-1-Ni-HNi Cai-1-Coi-1-Ni-HNi HNCACB HN(CO)CACB NN-NOESY Cai/Cbi-Ni-HNi Cai-1/Cbi-1-Ni-HNi Nj-HNj Ni-HNi i & in less extent, if any TROSY-type experiments Correlated nuclei & in less extent,...

Ngày tải lên: 04/10/2015, 15:52

Ngày tải lên: 24/08/2016, 16:05

... ADC of DM of the reference diet)/0.3 ADC of nutrient of test ingredient (%) = [(nutrient in test diet x nutrient ADC of the test diet) - (0.7 x nutrient concentration in reference diet x nutrient ... compositions of rice bran, corn meal and cassava meal are shown in Table In general, the chemical composition of ingredients has influence on the digestibility of its nutrients The chemical composition ... ADC of the reference diet)]/(0.3 x nutrient concentration in ingredient) Values were expressed in % of dry matter 2.3 Data analysis Data was examined by one way ANOVA using SAS version (SAS Institute,...

Ngày tải lên: 28/08/2013, 09:14

... Wilmington, DE, USA) in electron-ionization mode with an ionization voltage of 70 eV and ion source temperature of 230ºC The instrument was operated in selected-ion monitoring (SIM) mode The monitor ... application of this analytical method to environmental water samples, concentrations of EDTA in river water samples from urban and rural areas of Japan were investigated using SPE -derivatization- GC/MS ... being collected in estuarine regions In further studies, it will be necessary to survey the differences in EDTA contamination levels between urban and rural areas - 351 - Journal of Water and Environment...

Ngày tải lên: 05/09/2013, 10:15

... qui entraînent une réparation ou un arrêt urgent, ne sont pas considérées comme faisant partie du fonctionnement normal, ni comme étant catastrophiques NOTE Un fonctionnement normal comprend des ... ventilation The availability of ventilation has an influence on the presence or formation of an explosive gas atmosphere and thus also on the type of zone Guidance on availability is given in annex B NOTE ... reduction in the type and/or extent of zones; − shortening of the time of persistence of an explosive gas atmosphere; − prevention of the generation of an explosive gas atmosphere B.2.2 Design considerations...

Ngày tải lên: 25/12/2013, 10:41

... ADC of DM of the reference diet)/0.3 ADC of nutrient of test ingredient (%) = [(nutrient in test diet x nutrient ADC of the test diet) - (0.7 x nutrient concentration in reference diet x nutrient ... compositions of rice bran, corn meal and cassava meal are shown in Table In general, the chemical composition of ingredients has influence on the digestibility of its nutrients The chemical composition ... ADC of the reference diet)]/(0.3 x nutrient concentration in ingredient) Values were expressed in % of dry matter 2.3 Data analysis Data was examined by one way ANOVA using SAS version (SAS Institute,...

Ngày tải lên: 25/02/2014, 10:20

... 2007CB936000), National Natural Science Funds for Distinguished Young Scholar (No.20725518), Major Program of National Natural Science Foundation of China (No.90713019), National Natural Science Foundation ... Foundation of China (No.20575036) Important Project of Natural Science Foundation of Shandong Province in China (No.Z2006B09) and the Research Foundation for the Doctoral Program of Ministry of Education ... Inuence of pH on the uorescence [GSH] = 2.00 ã 10)6 molặL)1; [2] = 4.00 ã 10)5 molặL)1 The inuence of the concentration of on uorescence intensity is shown in Fig As can be seen, as the concentration...

Ngày tải lên: 07/03/2014, 05:20

... Ca2+-dependent manner Adhesion and uptake by cells expressing endogenous DC-SIGN and LSECtin We examined the endocytic and adhesive functions of the DC-SIGN-related lectins using cell lines endogenously ... complex-type N- glycans analyzed using the GRYP code representation (A) Definition of the GRYP code to represent nonreducing end residues and branch positions Nonreducing end sugars and core Fuc are indicated ... our understanding of the previously unknown mechanism of the functions of the DC-SIGN-related lectins Results Quantitative analysis of glycan-binding specificities of DC-SIGN-related lectins by...

Ngày tải lên: 15/03/2014, 23:20

... complete amino acid sequence of PPL2 determined by the combination of N- terminal sequencing and cDNA cloning contains 271 amino acid residues, including the six conserved cysteine residues of class ... concentration of inhibitor exhibiting agglutinating activity was termed the minimum inhibitory concentration Aliquots of 0.2 mL of the unit solution of the lectin were used for hemagglutination ... glycoproteins bovine thyroglobulin, ovine submaxillary mucin, bovine fetuin and bovine asialofetuin were devoid of hemagglutination inhibitory activity Bovine thyroglobulin contains nine complex...

Ngày tải lên: 16/03/2014, 13:20

... and gas sensing behavior of ZnO nanowires Fig Characteristics of In3 O2 nanowires: (a) SEM image of In3 O2 nanowires, (b) TEM image of nanowire 70 nm in width, and (c) ED pattern from the nanowire ... Conferences on Materials Science and on Sensors He Fig Response of the nanowires of SnO2 (solid line), and In3 O2 (dashed line) as a function of the operating temperature Ozone concentration ... and 45 invited talks) He also is an evaluator of European Union, in the area of nanoscience and nanomaterials, and the coordinator of the EU Project NANOS4 (nanostructured solid-state gas sensors...

Ngày tải lên: 16/03/2014, 15:25

... point of view The change in spectrum shape of synthesized SnO2 is mostly due to the intensive formation of Sn–OH groups and accumulation of molecular water during annealing Taking into account ... (Tarragona, Spain) His main areas of interest are in the design of semiconductor and carbon nanotube based gas sensors and in the application of intelligent systems to complex odor analysis Acknowledgments ... depending on propane concentration against operation time of the sensors SnO2 in the concentration range under investigation The high stability of the synthesized material can be explained only by thermal...

Ngày tải lên: 19/03/2014, 16:47

... dry air and the NO2 (or NH3 ) gas were maintained under constant conditions during the measurements A calibration curve, the relation between sensor response and NO2 (or NH3 ) concentration, was ... response curve to NO2 is not the same The response increased significantly with an increase in concentration until the NO2 gas concentration exceeded a certain value, as it can be seen in Fig ... relation curves between the response and gases concentration show a saturation point and an inflexion The response saturation point corresponds to the saturation point of gases adsorbed, but the inflexion...

Ngày tải lên: 20/03/2014, 13:06

... quantitation ion internal standard Qx = quantity of analyte injected in ng or concentration units Qis = quantity of internal standard injected in ng or concentration units 10.2.6.1 For each analyte and ... quantitation ion of the analyte in the sample Ais = integrated abundance of the quantitation ion of the internal standard in the sample Qis = total quantity (in micrograms) of internal standard ... RETENTION TIME DATA, QUANTITATION IONS, AND INTERNAL STANDARD REFERENCES FOR METHOD ANALYTES Retention Time (min:sec) Compound A a B b Quantitation IS Ion Reference # Internal Standards Acenaphthene-d10...

Ngày tải lên: 22/03/2014, 14:20

... rules formulated in Travancore during 1860s and subsequently in Cochin for the distribution of forest and wasteland for plantation crops were instrumental for the initial growth and expansion'l", ... of adsorbed anions in turn depends on the size and number of particles present in unit volume of latex and hence on the ORC of the latex Since coagulation is a process in which adsorbed anions ... consuming, labour intensive, 20 unsuitable for use in the field, not environment friendly, requires skilled manpower and involves heavy capital investment for setting up chemical! instrumentation...

Ngày tải lên: 23/03/2014, 21:21

... genes in nonstress conditions, in differentiation or developmental situations Its role is still not unravelled and its targets as a transcription factor unknown Studies performed on recombinant HSF1 ... consists in measuring the affinity of the factors for a series of oligonucleotides containing an increasing number of the binding motif Immediately following the addition of the different oligonucleotides, ... requirement for its binding site than the recombinant factor Using the program TARGETFINDER [35], we identified several genes containing the consensus binding site for the embryonic HSF2 in their...

Ngày tải lên: 24/03/2014, 00:21

... carbohydrate-dependent manner Mixtures of lactose and (asialo)fetuin were expected to be potent inhibitors Carbohydrate-independent binding of the neoglycoprotein and biotin-independent binding of the second-step ... histopathological and in vivo procedures The question of whether introduction of the bisecting GlcNAc changes the ligand properties (binding affinities) of biantennary N- glycans for branch-end-specific lectins ... median signal of binding of the fluorescent probe is given as extent of carbohydrate-ligand-dependent binding by subtracting carbohydrate-independent binding from total binding for each cell line BiB10-BSA...

Ngày tải lên: 30/03/2014, 13:20

... [4-7] In reality no cellular gene maintains constant expression levels under all conditions and the evaluation of an appropriate control gene to normalise QPCR data is therefore an essential requirement ... context of the viral infections that we investigated In contrast to all other infections, 18sRNA was not an unreliable control gene when MDDCs were infected with HIV-1BaL In addition it is of note ... are now many reports describing the unreliability of conventionally used housekeeping genes for the normalisation of QPCR data in certain experimental settings [4-7,14,15] Careful consideration...

Ngày tải lên: 18/06/2014, 18:20

... [4-7] In reality no cellular gene maintains constant expression levels under all conditions and the evaluation of an appropriate control gene to normalise QPCR data is therefore an essential requirement ... context of the viral infections that we investigated In contrast to all other infections, 18sRNA was not an unreliable control gene when MDDCs were infected with HIV-1BaL In addition it is of note ... are now many reports describing the unreliability of conventionally used housekeeping genes for the normalisation of QPCR data in certain experimental settings [4-7,14,15] Careful consideration...

Ngày tải lên: 20/06/2014, 01:20