historical methods for the determination of methylxanthines

... water formed during the reaction The fraction of the various forms of hydrogen can be determined from the ratios of the areas of the corresponding peaks The technique, implying measurement of the ... of the basic form of the indicator represents the measure of the quantity of acid centers present on the catalyst surface Obviously only the centers whose strength is higher than the pK, of the ... site is given by the slope of the linear portion of the curves of the type reported in Fig 20, while each point of the curve of Fig 21 corresponds to the specific activity of the various partially...

Ngày tải lên: 29/07/2015, 02:27

... of 95 ml) The A280 to A260 ratio of the UV-absorbing peak indicated it was composed mainly of nucleic acid In the profile of the NaOH-extracted polymer (B), the elution volume (80 ml) of saccharide ... compared to the other methods The SDS-extracted polymer included a small amount of material other than protein Furthermore, the steaming- and washing-extracted polymers contained large amounts of phosphorus ... buffer at a flow rate of ml/h and ml fractions were collected The void volume of the column was determined by the elution of Blue Dextran (Pharmacia) Other analyses - 147 - Journal of Water and Environment...

Ngày tải lên: 05/09/2013, 09:08

... inuences the uorescence intensity Therefore, the inuence of the volume of buffer was measured Because the volume of buffer added (1.003.00 mL) had little effect on the uorescence intensity, 2.00 mL of ... 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 ... constant for at least h Hence, the reaction was left to proceed for 10 min, and the uorescence was then measured at room temperature Inuence of interference The inuence of the main constituents of...

Ngày tải lên: 07/03/2014, 05:20

... for the issue of land suitable for the cultivation of plantation crop was formulated? The liberal rules formulated in Travancore during 1860s and subsequently in Cochin for the distribution of ... K) of the insulating medium and (iii) the reciprocal of the separation, t, between the plates The relation is given by'·' C = Kfj 1.3 t If the area of the plates and the separation between them ... has set in, is therefore an extremely difficult task" Numerous methods have been cited in literature for the measurement of the DRC of latex, of which the hydrometer":" is probably the most rapid...

Ngày tải lên: 23/03/2014, 21:21

... scrutinized the German version of this text Prof Nirschl suggested the idea of this book Prof Reimert organized the continuation of the research unit after the DFG funding as well as Prof Kasper, Prof ... derivation due to the time-dependence of the unit vectors Using the product rule for the derivation and the fact that the time derivative of the unit vector is the cross product of !rf with this ... the scaling of the argument on index k of the measured data in reciprocal space As the sum is finite, it only represents an approximation of the delta function The position of the origin and the...

Ngày tải lên: 29/05/2014, 18:32

... knowledge related to the mechanics of human movement The work at the University of California formed the basis for many of the fundamental techniques currently used for the study of human locomotion ... patterns of locomotion requires new methods that would limit the risk of producing artifact due to markers or the constraints of the testing methods For example, the constraints of the laboratory ... limiting the advancement of the study of human movement is the measurement of skeletal movement from markers or sensors placed on the skin The movement of the markers is typically used to infer the...

Ngày tải lên: 19/06/2014, 10:20

... in the sera of patient 313 had large deletions of a part of the 5'UTR These deletions are described in a separate report [21] The comparisons of the sera and isolates presented here were performed ... sequenced The dates of transmission indicate the date that HCV was added to the cells For the T1 through T7 isolates, the exact date of transmission sometimes wasn't known, but the first date of isolation ... (Figure 5) The change at position 204 was a reversion to the sequence found in the patient's sera For all three of these changes, one of the two isolates had the same base in that position as the patient...

Ngày tải lên: 20/06/2014, 02:20

... on the percentage of fully brown beans in the cut test 6: The effect of spreading of beans for two hours, prior to placement in boxes, on fermentation temperatures 7: The effect of spreading of ... reveals the presence of certain defects which may cause off-flavours and indicates the degree of fermentation of the beans which has a bearing on the flavour and quality of the beans The International ... case of larger quantities of beans e.g 250kg, partitioned boxes (Illustration 13) are used In this case, turning of beans is performed by shovelling them from one side of the partition to the other...

Ngày tải lên: 21/06/2014, 06:20

... nonconductive, they severely distort the signal in the detector; therefore, many systems remove the bubbles before the optical light path However, if the system removes the bubbles at any point within the ... depends on the size and range of the scales With practice, the recommended nomographs can be read with a precision of 1% However, the overall bias of the results depends on the bias of the analytical ... data applied to the nomographs and the validity of the theoretical equations and the numerical constants on which the nomographs are based An approximate check of the bias of the calculations...

Ngày tải lên: 29/07/2014, 18:58

... Federation Standard Methods for the Examination of Water and Wastewater Organism Plate 10900 E Selected Taxonomic References The most useful references for the nonspecialist are listed below These references ... D.J REISH & J.W ANDERSON, eds 1994 Ecology of the Southern California Bight Univ California Press, Berkeley REISH, D.J 1995 Marine Life of Southern California, 2nd ed Kendall/ Hunt Publ Co., Dubuque, ... Water Environment Federation Standard Methods for the Examination of Water and Wastewater Algae General TAYLOR, W.R 1957 Marine Algae of the Northeastern Coast of North America, 2nd ed Univ Michigan...

Ngày tải lên: 29/07/2014, 18:58

... Methods for the Examination of Water and Wastewater Anacystis © Copyright 1999 by American Public Health Association, American Water Works Association, Water Environment Federation Standard Methods ... Methods for the Examination of Water and Wastewater Synedra © Copyright 1999 by American Public Health Association, American Water Works Association, Water Environment Federation Standard Methods for ... for the Examination of Water and Wastewater Ceratium © Copyright 1999 by American Public Health Association, American Water Works Association, Water Environment Federation Standard Methods for the...

Ngày tải lên: 29/07/2014, 18:58

... atomic weights of many elements are not invariant but depend on the origin and treatment of the material The standard values of Ar(E) and the uncertainties (in parentheses, following the © Copyright ... a volumes of the concentrated reagent are diluted with b volumes of distilled water to form the required solution Table B: PREPARATION OF UNIFORM SODIUM HYDROXIDE SOLUTIONS Normality of NaOH Solution ... water professionals worldwide Through educational and technical information programs, AWWA promotes the improvement of the quality and quantity of the drinking water supply Contact information:...

Ngày tải lên: 29/07/2014, 18:58

... Comparison of Diagnostic Methods for the Detection of Parasites in Fish and disadvantages, depending on the purpose and target of study For parasitological investigation, the classical methods (the ... normal PCR reaction of 50 µl volume (25µl of master mix, Comparison of Diagnostic Methods for the Detection of Parasites in Fish 2µl of each primer, or µl of template and 18 or 20 µl of water) - Polymerase ... containing PBS The objectives of the present study were to investigate the use of different methodologies in fish parasite studies Thus, the aim is to compare classical and molecular methods for the diagnosis...

Ngày tải lên: 06/08/2014, 19:20

... volume of PBS The homogenized egg yolk was then mixed with two volumes of chloroform and incubated for hrs at room temperature After this incubation, the supernatant was collected To compare the ... respectively, after the first injection (Fig and 2) The titers of the vaccinated groups were three times higher than those of the control group Antibody profiles against OMP and DNT of B bronchiseptica ... Co., Germany) for 30 seconds After centrifugation of the sonicated bacterial culture broth at 8,000 rpm for 30 min, the supernatant was centrifuged at 20,000 rpm for hr at 40C and the pellet was...

Ngày tải lên: 07/08/2014, 15:20

... functioning of each method was not deteriorated by the other The relationship obtained with the comparison of the two methods over the whole period (n 589) is presented in figure The slope of the regression ... transpiration The combination of the two methods seems possible in the same experiment The heat balance for the small trunks, and transpiration calculation for small periods and Granier’s method for the ... Pairs of thermocouples inserted above and below the heater allow the measurement of the conduction flux (Qv) The radial outward flow (Qr) is calculated from thermopile meathermopile was composed of...

Ngày tải lên: 08/08/2014, 23:22

... Q9cannot RESULTS Power of the methods Table II shows the power of the methods of estimation for all simulated variants For a QTL effect of 40, the power is low for both methods and all variants ... linkage of markers with a QTL and then use Method I for the estimation Unfortunately, Fulker and Cardon (1994) give little information about the quality of their estimator of the QTL variance The ... results The power of the methods was defined as the percentage of replications where the null hypothesis was rejected at the 5% level For Method II this approach is unambiguous while this is not the...

Ngày tải lên: 09/08/2014, 18:21

... precipitates The spectrum of the material reveals peaks for Ca and Sb The strong decrease of the Ca2+ pool in the pistil at the last stages of pistil development coincides with the degradation of the ... factors Furthermore, at this stage, the main task of the flower bud is to complete the growth and maturation of anthers and the pistil Consequently, the intensity of the signalling events in the stigma ... reproductive organs The presence of the dye inside the cells of the olive pistil indicates the following: (1) The amount of dye solution used was sufficient to penetrate the tissues of the inflorescence...

Ngày tải lên: 11/08/2014, 11:21

... [2] Furthermore, the performance of these scores may be affected by the therapy used to support the cerebral circulation The MOD cardiovascular component score is calculated based on the pressure-adjusted ... total values for both SOFA and MOD scores were manually checked by one of the investigators (CD) for their accuracy by comparing them with the laboratory or physiologic data recorded in the QS system ... mortality SOFA and MOD 33 56% SOFA and MOD 49 41% SOFA not MOD 86 49% SOFA not MOD 40 35% MOD not SOFA 0% MOD not SOFA 85 7% Neither 120 Neither 28% MOD, Multiple Organ Dysfunction; SOFA, sequential...

Ngày tải lên: 13/08/2014, 02:24

... in the evaluation of the performance of a classification algorithm The SN is the proportion of correct positive classifications out of the number of true positives The SP is the proportion of ... negative classifications out of the number of true negatives The accuracy is the total number of correct classifications out of the total number of samples The PPV is the probability that a patient ... level of accuracy shows the real potential for confident clinical assignment of therapies on an individual patient basis Then the prediction accuracy of the ensemble can be obtained using the standard...

Ngày tải lên: 14/08/2014, 17:22

... sum of squared deviations of every point from the mean of the cluster, or by squaring the distance between the cluster means and dividing that by the sum of the reciprocals of the number of points ... groups forming between the two groups.6 The group average method the distance between groups is the average of the distances between all pairs of observations in the two groups.6 It takes the average ... THE COMPARISON OF CLASS EVIDENCE A Thesis Submitted to the Faculty of Purdue University by Elisa Anne Liszewski In Partial Fulfillment of the Requirements for the Degree of Master of Science August...

Ngày tải lên: 24/08/2014, 11:33