chromatographic determination of folates
A review on sample preparation and chromatographic determination of acephate and methamidophos in different samples
Ngày tải lên :
02/09/2015, 13:47
... derivatization of the compounds The enantioselective bioactivity of both acephate and methamidophos in future may produce new method(s) of detection including determination of extent of toxicity of these ... Study of acephate and methamidophos in food Grains (PDPAS) during 2008 and 2006 A review on sample preparation and chromatographic determination was developed for the sensitive determination of ... Urinary concentration of acephate was non-detectable after 48 h of the exposure (Maroni et al., 1990) Detection of acephate and methamidophos Based on physicochemical properties of acephate and methamidophos,...
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High performance liquid chromatographic analysis of urinary catecholamines employing amperometric detection.pdf
Ngày tải lên :
16/12/2012, 15:24
... amount of internal standard, and performed acetic acid extractions from the alumina instead of used by the original authors Adjust the pH of mL of urine to 3.0 with N sodium hydroxide Add 15 mL OF ... mL of 0.7 M sulfuric acid and allow to drain Elute the catecholamines with mL of M ammonium sulfate solution Add 100 ~L of 4% thioglycolic acid and 500 ~L of M Tris buffer pH 8.6 Add 100 mg of ... PERFORMANCE LIQUID CHROMATOGRAPHIC ANALYSIS OF URINARY CATECHOLAMINES TABLE TABLE CHROMATOGRAPHICCONDITIONS 287 BETWEEN-DAY PRECISION Present Study Moyer et al (8) Compound 90/10 mixture of 70 mM phosphate...
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DETERMINATION OF THE DIGESTIBILITY OF SOME PLANT INGREDIENTS FOR GRASS CARP (Ctenopharyngodon idella)
Ngày tải lên :
28/08/2013, 09:14
... ADC of DM of test ingredient (%) = (ADC of DM of the test diet - 0.7 x ADC of DM of the reference diet)/0.3 ADC of nutrient of test ingredient (%) = [(nutrient in test diet x nutrient ADC of the ... method The determination of chromium III (trivalent) that involves digestion of organic matter, solubilisation of chromium and determination of chromium was Table Chemical compositions of studied ... means of three replicates with standard error (SE) 989 Determination of the digestibility of some plant ingredients for grass carp (Ctenopharyngodon idella) Table The digestibility of protein of...
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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
Ngày tải lên :
05/09/2013, 10:15
... for the Examintion of Water would be to perform an inter-laboratory validation study of the proposed method Determination of EDTA in river water samples For the application of this analytical ... the Examination of Water Occurrence of EDTA in river water samples from three regions of Japan was examined EDTA was detected in ten of thirteen river water samples A high level of EDTA was observed ... mL methanol and mL of Milli-Q water, respectively Extraction of water samples was carried out at a flow rate of 10mL/min After extraction, cartridges were rinsed with 3mL of Milli-Q water and...
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iec 60076-10 power transformers - determination of sound levels
Ngày tải lên :
25/12/2013, 10:36
... provisions of this part of IEC 60076 For dated references, subsequent amendments to, or revisions of, any of these publications not apply However, parties to agreements based on this part of IEC ... measurement of sound intensity – Measurement with pairs of pressure sensing microphones IEC 61378 (all parts), Convertor transformers ISO 3746:1995, Acoustics – Determination of sound power levels of ... the presence of sound It is expressed in pascals 3.2 sound pressure level, L p ten times the logarithm to the base 10 of the ratio of the square of the sound pressure to the square of the reference...
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Tài liệu Báo cáo " Determination of the annual beta dose by meaming beta activity using the liquid scintillation technique " ppt
Ngày tải lên :
13/02/2014, 04:20
... CPΠ-68-01 Proceeding of the 14th Conference, University of Mining and Geology, Hanoi, 17th November (2004) 50 [7] Ha Van Tan (Chief Ed.), Archaeology of Viet Nam, The Publisher of Social Science, ... was of the Ultima Gold AB series of DIN–based cocktails This cocktail was designed specifically, for alpha/beta separation, by the Packard Instrument Company with an aqueous concentration of approximately ... three counting The annual dose of beta (mGy/yr) was evaluated from: Dβ = 2,22.10-3.Cβ and that of gamma (mGy/yr) from: Dγ = 0.1752.Iγ, where Cβ is the specify activity of beta (Bq/kg), and (Iγ) is...
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Tài liệu METHOD 21 - DETERMINATION OF VOLATILE ORGANIC COMPOUND LEAKS doc
Ngày tải lên :
14/02/2014, 08:20
... concentration 3.2 Calibration precision means the degree of agreement between measurements of the same known value, expressed as the relative percentage of the average difference between the meter readings ... and equipment This test method may not address all of the safety problems associated with its 1154 use It is the responsibility of the user of this test method to establish appropriate safety ... practices and determine the applicability of regulatory limitations prior to performing this test method 5.2 Hazardous Pollutants Several of the compounds, leaks of which may be determined by this method,...
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Tài liệu Báo cáo Y học: NMR-based determination of the binding epitope and conformational analysis of MUC-1 glycopeptides and peptides bound to the breast cancer-selective monoclonal antibody SM3 pptx
Ngày tải lên :
21/02/2014, 15:20
... fragment of the ligand of the X-ray structure (RCSB PDB entry 1SM3) After small manual corrections, the ligands were docked into the binding site of SM3 using the FLEXIDOCK module of the SYBYL software ... correlation times of these proton pairs The lower three diagrams show examples of build-ups of structurally relevant NOE contacts site of SM3 is shown in Fig 5B For comparison of X-ray and NMR ... to about 36% of the interaction of the full peptide with the binding cavity of SM3 The sizes of the surfaces were determined using distances between ligand ˚ atoms and protein atoms of less than...
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Tài liệu BÁO CÁO " DETERMINATION OF THE DIGESTIBILITY OF SOME PLANT INGREDIENTS FOR GRASS CARP (Ctenopharyngodon idella) " pdf
Ngày tải lên :
25/02/2014, 10:20
... ADC of DM of test ingredient (%) = (ADC of DM of the test diet - 0.7 x ADC of DM of the reference diet)/0.3 ADC of nutrient of test ingredient (%) = [(nutrient in test diet x nutrient ADC of the ... method The determination of chromium III (trivalent) that involves digestion of organic matter, solubilisation of chromium and determination of chromium was Table Chemical compositions of studied ... means of three replicates with standard error (SE) 989 Determination of the digestibility of some plant ingredients for grass carp (Ctenopharyngodon idella) Table The digestibility of protein of...
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Báo cáo khoa học: Kinetic and mechanistic characterization of Mycobacterium tuberculosis glutamyl–tRNA synthetase and determination of its oligomeric structure in solution pptx
Ngày tải lên :
07/03/2014, 03:20
... Analysis of the kinetics of proteolysis of Mt- and Ec-GluRS Fig S9 Minimal models of the proteolytic events leading to fragments M1M5 of Mt-GluRS and E1-E3 of Ec-GluRS Fig S10 DLS analysis of GluRS ... initial velocity of reactions that contained xed levels of the inhibitor (I), varying concentration of one of the substrates and constant concentration of others After inspection of the Dixon or ... design of specic inhibitors Analysis of the M tuberculosis genome sequence led to the identication of one ORF encoding a putative GluRS (Rv2992c, 1473 bp) Upstream of Rv2992c the sequences of one...
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Báo cáo khoa học: A novel metallobridged bis(b-cyclodextrin)s fluorescent probe for the determination of glutathione doc
Ngày tải lên :
07/03/2014, 05:20
... concentration of increased, the uorescence intensity of the system also increased slightly We therefore used 2.00 mL of 2.00 ã 10)4 molặL)1 metallobridged bis(bCD)s Inuence of reaction time The effect of ... intensity Inuence of the concentration of metallobridged bis(b-CD)s Relative fluorescence intensity (a.u.) Inuence of pH 7.00 8.00 (105molãL1) Fig Inuence of the concentration of on uorescence ... uorescence was then measured at room temperature Inuence of interference The inuence of the main constituents of plasma on the determination of 2.00 ã 10)6 molặL)1 GSH were studied The criterion...
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Báo cáo khoa học: Determination of thioxylo-oligosaccharide binding to family 11 xylanases using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and X-ray crystallography pot
Ngày tải lên :
07/03/2014, 17:20
... weight of softwoods, 1530% of hardwoods and up to 30% of annual graminaceous plants [7,8] Endo-1,4-b-xylanases (EC 3.2.1.8) are O-glycoside hydrolases that catalyze a random hydrolysis of internal ... Ir Number of observations Number of unique reections Temperature (K) Rfactor (%) Rfree (%) Rmsd bond lengths (A) Rmsd bond angles () Number of all atoms Number of protein atoms Number of waters ... the absence of the dimeric form of CTX, as the heterodimer was present in the case of TRX II Observation of noncovalent proteininhibitor complexes The formation of noncovalent proteininhibitor...
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DETERMINATION OF VOLATILE ORGANIC COMPOUNDS (VOC) IN CONSUMER PRODUCTS AND REACTIVE ORGANIC COMPOUNDS IN AEROSOL COATING PRODUCTS doc
Ngày tải lên :
14/03/2014, 20:20
... apply to the determination of the composition or concentration of fragrance components in products 1.4 The term “Executive Officer” as used in this document means the Executive Officer of the Air ... analysis of samples to determine the weight percent of total volatile material, using US EPA Reference Methods 24/24A, ASTM D 2369-01 3.3.2 Determination of sample water content For determination of ... section 7.0 3.3.3 Determination of ammonium content using ASTM D 1426-98 or US EPA Method 300.7 3.3.4 Determination of ketones and alcohol content using NIOSH Method 1400 3.3.5 Analysis of exempt and...
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Determination of risk
Ngày tải lên :
15/03/2014, 23:56
... (pollutant variety, complexity of ecosystems and geology) • Efficient risk assessments are difficult to be carried out in case of the presence on site of a multitude of pollutants, pollutant fractions ... • Reuse of contaminated soil material is not systematically taken into consideration b) In-Situ/On-Site Duration of clean-up procedures is often too long • Combination and optimisation of different ... remediation technologies are too often left aside due to remaining uncertainties on their efficiency • There is a lack of experience in the evaluation of the efficiency of in-situ bioremediation technologies...
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DETERMINATION OF TRACE ELEMENTS BOUND TO SOIL AND SEDIMENT FRACTIONS
Ngày tải lên :
15/03/2014, 23:56
... Redistribution of Pb and Cu in the presence of humic acid was demonstrated The selectivity of the reagents was insufficient to warrant interpretation of results in terms of a specific origin of a metal ... implications (e.g., during dredging operations) of land disposal of waste material, of acid precipitation, of redox changes in subsoil, and of ingestion of polluted urban dust, can be qualitatively ... hampered a good comparability of data, was the lack of suitable reference materials that precluded control of the quality of the measurements Thus, standardization of leaching and extraction schemes...
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Báo cáo khoa học: ˚ cDNA cloning and 1.75 A crystal structure determination of PPL2, an endochitinase and N-acetylglucosaminebinding hemagglutinin from Parkia platycephala seeds potx
Ngày tải lên :
16/03/2014, 13:20
... and molecular mass determination of PPL2 (A) MALDI-TOF mass determination of native PPL2 purified by affinity chromatography as illustrated in the insert Insert: the fraction of a Parkia platycephala ... possible chitinase activity of PPL2 was investigated by quantitative GC determination of the amount of GlcNac released using chitin as substrate PPL2 released lg of GlcNacÆh)1Æ(mg protein))1 ... aprotinin (6.0 kDa) Lane b, reduced PPL2 (B) MALDI-TOF mass determination of reduced and pyridylethylated PPL2 Insert: apparent molecular masses of native PPL2 determined by equilibrium sedimentation...
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Báo cáo khoa học: "Automatic Determination of Parts of Speech of English Words" docx
Ngày tải lên :
16/03/2014, 19:20
... adequate to maintain the goal of 95 per cent accuracy DETERMINATION OF PARTS OF SPEECH 55 In investigating exceptions to Rule C, adverbs with additional parts of speech of PR, CJ, PV, IJ, PN, and ... cent loss from the point of view of inclusive part of speech Rule A, it will be remembered, requires the removal of affixes from the kernel of the word If this kernelizing of the word is omitted, ... directly tested, but may be inferred from the five-hundred-word EARL DETERMINATION OF PARTS OF SPEECH 63 64 EARL DETERMINATION OF PARTS OF SPEECH 65 66 EARL random sample, since we have just proved...
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Báo cáo " Determination of the 15 MeV bremsstrahlung spectrum from thin W target on the microtron MT-17 accelerator " doc
Ngày tải lên :
22/03/2014, 11:20
... P.D Khue, B.V Loat / VNU Journal of Science, Mathematics - Physics 24 (2008) 81-87 elsewhere The purpose of the present work was to investigate the energy spectrum of bremsstrahlung photons emitted ... main characteristics of the nuclear reactions investigated and decay data of the reaction products are presented in Table 1[9] Fig Experiment arrangement for the investigation of Bremsstrahlung ... )[1 − exp( − λ t c )] where: No is the number of target nuclei; ε is the photopeak efficiency of the detector; Iγ is the branching ratio or intensity of the gamma ray ; λ is the decay constant;...
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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf
Ngày tải lên :
22/03/2014, 14:20
... acetone at a concentration of 500 µg/mL of each This solution is used in the preparation of the calibration solutions Dilute a portion of this solution by 10 to a concentration of 50 µg/mL and use this ... abundance of the quantitation ion of the analyte Ais = integrated abundance of the quantitation ion internal standard Qx = quantity of analyte injected in ng or concentration units Qis = quantity of ... concentration of analyte or surrogate in µg/L in the water sample Ax = integrated abundance of the quantitation ion of the analyte in the sample Ais = integrated abundance of the quantitation ion of the...
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