A preliminary investigation into a simple method for the determination of the mean ionisation energy of gas mixtures used in the NPL primary gas counting system

2012 ◽  
Vol 70 (9) ◽  
pp. 2043-2046
Author(s):  
H.C. Phillips ◽  
J.P. Sephton ◽  
L.C. Johansson ◽  
J.C.J. Dean
Keyword(s):  
Preliminary Investigation ◽  
Gas Mixtures ◽  
Simple Method ◽  
Counting System ◽  
Ionisation Energy ◽  
The Mean

ENZYMATISCH-FLUOROMETRISCHE BESTIMMUNG DER CORTISOLBINDUNGSKAPAZITÄT DES PLASMA

1967 ◽  
Vol 56 (1) ◽  
pp. 99-106 ◽  
Author(s):  
K. Leybold ◽  
J. Rieper ◽  
L. Weissbecker
Keyword(s):  
Binding Capacity ◽  
Liver Microsomes ◽  
Mean Value ◽  
Female Rats ◽  
Plasma Samples ◽  
Simple Method ◽  
Adult Men ◽  
The Mean ◽  
Precision And Accuracy

ABSTRACT A simple method for the determination of cortisol-binding capacity is described. For saturation of the cortisol-binding proteins, plasma samples are incubated with an excess of cortisol. In the next step NADPH and liver microsomes of female rats are added. The microsomal Δ4-3-ketosteroid hydrogenase only reduces non protein-bound cortisol to tetrahydrocortisol-5α. Then the steroids are extracted by dichloromethane, and after some purification steps analyzed by fluorometry. Tetrahydrocortisol gives practically no fluorescence. The cortisol determined by this method corresponds to protein-bound cortisol and indicates the extent of cortisolbinding capacity. Precision and accuracy of the method were found to be good. The values of cortisol-binding capacity obtained by our method are compared with the results of other authors. The mean value of adult men was 25.5 ± 3.4 μg/100 ml, that of pregnant women, mens IX-X, 42.3 ± 4.2 μg/100 ml.

Simple Analytical Method for Organophosphorus Pesticide Residues in Milk

1990 ◽  
Vol 73 (5) ◽  
pp. 770-772
Author(s):  
Masatake Toyoda ◽  
Kazuhiko Adachi ◽  
Tadakazu Ida ◽  
Katsuhiko Noda ◽  
Norio Minagawa
Keyword(s):  
Pesticide Residues ◽  
Milk Fat ◽  
Capillary Column ◽  
Organophosphorus Pesticide ◽  
Simple Method ◽  
Coefficients Of Variation ◽  
Complete Study ◽  
The Mean ◽  
Capillary Column Gas Chromatography

Abstract A simple method for determination of organophosphorus pesticide residues at the parts per million level In milk was developed. Pesticide residues were extracted with acetonitrlle added to aqueous milk, fat was removed by zinc acetate addition and dichloromethane partition, and analytes were concentrated and analyzed by wide-bore capillary column gas chromatography. Recoveries of 6 pesticides spiked in milk samples at levels of 0.1 and 1.0 μg/mL were 82.1- 93.8% and 79.7-96.6%, respectively. Triplicate samples spiked with 6 pesticides at 1 itg/mL were analyzed independently by 3 laboratories. Average recoveries were greater than 80%, and the mean coefficients of variation for the complete study were 2.9% for diazlnon, 5.4% for dimethoate, 4.6% for malathlon, 4.6% for parathlon, 4.9% for EPN, and 6.1% for phosalone.

RADIOIMMUNOASSAY OF OESTRONE AND OESTRADIOL IN HUMAN PLASMA

1972 ◽  
Vol 69 (3) ◽  
pp. 567-582 ◽  
Author(s):  
Yvonne Emment ◽  
William P. Collins ◽  
Ian F. Sommerville
Keyword(s):  
Menstrual Cycle ◽  
Human Plasma ◽  
Simple Method ◽  
Healthy Women ◽  
Theoretical Error ◽  
Dextran Coated Charcoal ◽  
Coefficients Of Variation ◽  
The Mean

ABSTRACT A simple method for the determination of oestrone and oestradiol in human plasma is described and evaluated in terms of theoretical and practical errors. The oestrogens are separated on columns of Sephadex LH 20 and, after equilibration with antiserum, the unbound steroid is removed with dextran-coated charcoal. The mean total random theoretical error is calculated to be 22 %; the coefficients of variation of replicate analyses on pooled female plasma were from 13–18 % for both steroids; in male plasma the values were 17 % for oestradiol and 27 % for oestrone. The concentrations of oestradiol, expressed in pg/ml ± sd) in samples collected from healthy women during the menstrual cycle were 69 ± 56 (days 1–10); 126 ± 66 (days 11–20) and 99 ± 54 (days 21–30). Corresponding values for oestrone were 119 ± 46, 156 ± 41 and 156 ± 27.

Standardization of 243Am by Efficiency Extrapolation Method

2013 ◽  
Author(s):  
Zhen-yuan Zhong ◽  
Tao Bai ◽  
Mou Li ◽  
Jie Liu ◽  
Yi-hua Dai ◽  
...  
Keyword(s):  
Activity Concentration ◽  
Chemical Yield ◽  
Extrapolation Method ◽  
Activity Measurement ◽  
Total Efficiency ◽  
Counting System ◽  
Coincidence System ◽  
Radiochemical Determination ◽  
The Mean

243Am is a very important nuclide as a chemical yield tracer for the radiochemical determination of 241Am in environmental, food and other samples. For the study of absolute activity measurement of 243Am samples, efficiency extrapolation method by 4πα,β(PC)-γ(NaI(TI)) counting system is introduced in this paper. A solution containing 243Am in equilibrium with its daughter 239Np was standardized by this coincidence system, and the activity concentration of 243Am was just half of the gross activity concentration based on the theory of radioactivity equilibrium. In the experiment, the efficiencies of 243Am and 239Np were changed by altering the applied HV step by step, and the gross activity was obtained while the total efficiency of α and β was extrapolated to 100%. The final result for the efficiency extrapolation method is 5116.1(1±0.89%) Bq/g, which is the mean of the results obtained for the eight VYNS sources. As comparison, the result for ionization chamber is 5141.2(1±0.39%)Bq/g which is the mean of the results obtained for the six glass sources. The results show that there is good consistency between both methods adopted, and the agreement between results by both expereiments was 0.49%. The reference time is January 1 2012 0h.

Determination of Aluminum in Wines by Direct Graphite Furnace Atomic Absorption Spectrometry

1994 ◽  
Vol 77 (2) ◽  
pp. 463-466 ◽  
Author(s):  
Michel Larroque ◽  
Jean C Cabanis ◽  
Laurence Vian
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Simple Method ◽  
Single Beam ◽  
Graphite Furnace Atomic Absorption ◽  
The Mean ◽  
Fortified Wines

Abstract A simple method for direct routine determination of aluminum in wine by graphite furnace atomic absorption spectrometry is described. This procedure allows good sensitivity by inclusion of a cool-down step before atomization. The detection limit obtained with a single-beam apparatus was 1.5 μg/L. Recoveries of aluminum in red, white, and fortified wines ranged from 91.7 to 109.5%. Aluminum was determined in 98 red table wines from the south of France. The mean aluminum content was 0.763 mg/L (range, 0.25–2.55 mg/L). In addition, the ability of the wine to dissolve the aluminum in the crown cap was shown.

Conversion of 3H-Testosterone to Dihydrotestosterone in Human Hypertrophic Prostatic Tissue

1979 ◽  
Vol 18 (06) ◽  
pp. 297-299 ◽  
Author(s):  
S. Zgliczynski ◽  
B. Baranowska
Keyword(s):  
Conversion Rate ◽  
Prostatic Tissue ◽  
Simple Method ◽  
Androgen Metabolism ◽  
The Mean ◽  
Prostatic Gland

SummaryThe aim of the study was to develop a simple method for the determination of the conversion of testosterone to 5α-dihydrotestosterone (5α-DHT) after incubation of human hypertrophic prostatic tissue with 3H-testosterone. The mean conversion rate of 3H-testosterone to 5α-DHT in hypertrophic prostatic tissue was found to be higher than in normal and carcinomatous tissue. The results indicate that androgen metabolism in the hypertrophic prostatic gland is enhanced.

scholarly journals Preliminary results of a quick, simple method of detecting antimony in water samples

2008 ◽  
Vol 6 (4) ◽  
pp. 520-525
Author(s):  
Mónica Díaz-Pérez ◽  
Manuel Aboal-Somoza ◽  
Pilar Bermejo-Barrera ◽  
Adela Bermejo-Barrera
Keyword(s):  
Tap Water ◽  
Human Consumption ◽  
Chemical Modifier ◽  
Fast Method ◽  
Simple Method ◽  
Preliminary Results ◽  
Method Of Determination ◽  
Analytical Recovery ◽  
The Mean

AbstractPreliminary results of development of a direct and fast method of determination of antimony in samples of tap water using GFAAS are presented. The found levels of antimony were lower than permitted for human consumption. A mixture of Pd and Mg(NO3)2 (concentrations in the injected solution: 8.6 μg mL−1 and 5.8 μg mL−1 respectively) was used as the chemical modifier. The pyrolysis and atomization temperatures were 1000 and 1700°C, respectively and the mean analytical recovery 98.2%.

The properties of anisotropic small-angle scattering

1990 ◽  
Vol 23 (2) ◽  
pp. 79-81 ◽  
Author(s):  
D. A. Svetogorsky
Keyword(s):  
Cross Section ◽  
Small Angle ◽  
Symmetric Tensor ◽  
Radius Of Gyration ◽  
Simple Method ◽  
Angle Measurements ◽  
Anisotropic System ◽  
Angle Scattering ◽  
The Mean

It is shown that the cross section of small-angle neutron scattering (SANS) on an anisotropic system of point scatterers is determined by a symmetric tensor (R). The mean square radius of gyration of the system is the trace of R. A simple method is proposed for experimental determination of the tensor R by small-angle measurements with rotation of a sample.

Simple method for estimating glycosylated hemoglobins, and its application to evaluation of diabetic patients.

1978 ◽  
Vol 24 (10) ◽  
pp. 1708-1710 ◽  
Author(s):  
J Chou ◽  
C A Robinson ◽  
A L Siegel
Keyword(s):  
Plasma Glucose ◽  
Simple Procedure ◽  
Glycosylated Hemoglobin ◽  
Blood Glucose Control ◽  
Exchange Chromatography ◽  
Diabetic Patients ◽  
Simple Method ◽  
The Mean

Abstract Recent reports have suggested that determination of glycosylated hemoglobin may serve as a clinical aid for long-term blood glucose control in diabetes mellitus. We describe a simple procedure for measuring it by ion-exchange chromatography. Hemolysates were subjected to Bio-Rex 70 chromatographic separation on small columns. Percentages in the normal group ranged from 4.7 to 8.8% of total hemoglobin; the mean +/- standard error was 6.61 +/- 0.31%. Values in the diabetic group ranged from 6.9 to 17.4%; the mean was 10.83 +/- 0.34. Plasma glucose concentrations after fasting, plotted vs. the percent of glycosylated hemoglobin, revealed a linear relationship at normal or moderately high glucose concentrations. However, the values for glycosylated hemolgobin approached a plateau with grossly higher plasma glucose concentrations after fasting. Our results support the view that, due to its long half-life, the estimation of glycoylated hemoglobin reflects the integrated glucose concentrations to which the erythrocytes have been previously exposed.

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