Routine Determination of Carbaryl in Dipping Fluids and Deposits on Cattle Hair

1966 ◽  
Vol 49 (5) ◽  
pp. 986-989
Author(s):  
J H P Dingle
Keyword(s):  
Cow Dung ◽  
Sampling Techniques ◽  
Background Interference ◽  
Large Numbers

Abstract Sampling techniques and an ultraviolet method, capable of handling large numbers of samples, have been developed for carbaryl in dipping fluids and cattle hair deposits. The absorbance (280 mμ) of dip samples is measured after suitable dilution with ethanol; a correction is made for the presence of 1-naphthol, but background interference from dip dirt, clay, cow dung, etc. is negligible at the dilutions used. The amount of carbaryl deposited on cattle hair dipping is estimated similarly after extraction with ethanol. The accuracy of the dip analysis and the effect of hair grease on the analysis of hair deposits are discussed.

Sampling, Preservation and Counting of Samples II: Zooplankton

2017 ◽  
Author(s):  
Peter H. Wiebe ◽  
Ann Bucklin ◽  
Mark Benfield
Keyword(s):  
Genetic Analysis ◽  
High Speed ◽  
Morphological Analysis ◽  
Taxonomic Composition ◽  
Sampling Techniques ◽  
Sample Analysis ◽  
Sample Preservation ◽  
The Past ◽  
Plankton Collection

This chapter reviews traditional and new zooplankton sampling techniques, sample preservation, and sample analysis, and provides the sources where in-depth discussion of these topics is addressed. The net systems that have been developed over the past 100+ years, many of which are still in use today, can be categorized into eight groups: non-opening/closing nets, simple opening/closing nets, high-speed samplers, neuston samplers, planktobenthos plankton nets, closing cod-end samplers, multiple net systems, and moored plankton collection systems. Methods of sample preservation include preservation for sample enumeration and taxonomic morphological analysis, and preservation of samples for genetic analysis. Methods of analysis of zooplankton samples include determination of biomass, taxonomic composition, and size by traditional methods; and genetic analysis of zooplankton samples.

ANALISIS POLA DAYA TARIK WISATA BERDASARKAN POTENSI SUMBERDAYA (SUPPLY) SEBAGAI ASET DAN DAYA TARIK DI DAERAH ISTIMEWA YOGYAKARTA

2020 ◽  
Vol 14 (01) ◽  
pp. 13-22
Author(s):  
Sri Wahyuni
Keyword(s):  
Qualitative Research ◽  
Research Methods ◽  
Qualitative Research Methods ◽  
Data Sources ◽  
Sampling Techniques ◽  
Tourist Attraction ◽  
Tourist Attractions ◽  
Tourist Destinations ◽  
Special Region

The purpose of this research is to study and to analyze the pattern of tourist destinations to determine the excellence of attractions in each district in the Special Region of Yogyakarta, as a tourist attraction. This research uses qualitative research methods with sampling techniques using positive sampling. Data sources used are informants, tourist attractions, and documents. Determination of the advantages of a tourist attraction in a regency and even in the Special Region of Yogyakarta aims to increase the selling power or visitors of a tourist attraction and become an icon or mascot in the regency or region in Yogyakarta Special Region. From the results of the discussion, it was concluded that the most preeminent in the Yogyakarta Special Region was Tourism, Beach and Temple Villages. Keywords: Tourist Patterns, Tourist Attraction, Tourist Asset, Potential Resources

scholarly journals Rapid Production of Graphite Without Contamination for Biomedical AMS

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 344-350 ◽  
Author(s):  
John S. Vogel
Keyword(s):  
Isotopic Fractionation ◽  
Cross Contamination ◽  
Biological Variability ◽  
Muffle Furnace ◽  
New Class ◽  
Large Numbers ◽  
Rapid Production ◽  
Disposable Plastic ◽  
Single Reaction

The application of AMS to the detection of 14C makes possible a new class of sensitive experiments in molecular biology. Such experiments inherently produce large numbers of samples for the determination of biological variability in molecular interactions. The samples vary in 14C concentration over many orders of magnitude. We added TiH2 to aid the reduction of CO2 by zinc in a sealed tube to reproducibly make graphite without sample cross-contamination. The CO2 is transferred from a combustion tube to the reaction tube through a disposable plastic manifold. The sealed tubes are heated to a single-reaction temperature in a muffle furnace. The process is complete within 5 h. Bulk isotopic fractionation in the finished graphite is less than 0.5%.

Direct solid-phase enzymoimmunoassay of testosterone in saliva.

1989 ◽  
Vol 35 (10) ◽  
pp. 2044-2047 ◽  
Author(s):  
K Howard ◽  
M Kane ◽  
A Madden ◽  
J P Gosling ◽  
P F Fottrell
Keyword(s):  
Detection Limit ◽  
Analytical Procedure ◽  
Solid Phase ◽  
Medical Applications ◽  
Microtiter Plates ◽  
Large Numbers ◽  
Coefficients Of Variation ◽  
Serial Sampling ◽  
Direct Solid

Abstract This competitive, solid-phase enzymoimmunoassay for testosterone in saliva is carried out on microtiter plates and involves no chromatographic or extraction steps. With an overnight incubation the detection limit of the assay is 230 fg per well (16.1 pmol/L). There was a good correlation (correlation coefficient 0.95) between testosterone concentrations measured with and without prior extraction of the saliva samples. Repeated assay of three control saliva samples containing a range of testosterone concentrations (200-1000 pmol/L) gave within- and between-assay coefficients of variation of 5.5-13.2%. The analytical procedure is simple and closely resembles already published procedures for the determination of progesterone and estrone (with extraction) in saliva. One person can assay 200 samples in 24 h and the assay is suitable for reproductive and sports medical applications, particularly for projects involving serial sampling and yielding large numbers of samples.

Copper Artifact Analysis with the X-Ray Spectrometer

1962 ◽  
Vol 28 (2) ◽  
pp. 234-238 ◽  
Author(s):  
Edward J. Olsen
Keyword(s):  
Pilot Study ◽  
Raw Materials ◽  
Sampling Techniques ◽  
Great Lakes Region ◽  
Analytical Instrument ◽  
X Ray ◽  
Artifact Analysis ◽  
Inherent Error ◽  
European Trade

AbstractThe X-ray spectrometer method as an archaeological tool is discussed with special reference to its limitations as a chemical analytical instrument. Qualitative results are presented for six North American copper samples, one European trade brass, and nine artifacts from the Great Lakes region. From this pilot study it is concluded that the most fruitful results in the problem of the determination of provenance of copper artifacts will be obtained from semi-quantitative optical spectographic analyses of carefully collected artifacts and raw materials. The largest inherent error in this problem is that of meaningful sampling techniques. The only recourse is to treat such chemical data statistically and determine the probabilities that given specimens came from the various possible sources.

An electrical method of measuring non-electrolyte permeability

1969 ◽  
Vol 172 (1028) ◽  
pp. 203-225 ◽  
Keyword(s):  
Gall Bladder ◽  
Streaming Potential ◽  
Concentration Gradients ◽  
Bladder Epithelium ◽  
Electrical Method ◽  
Streaming Potentials ◽  
Unstirred Layers ◽  
Large Numbers ◽  
Tracer Methods

A rapid procedure based on that of Smyth & Wright (1966) is described for obtaining a measure of the permeability of rabbit gall-bladder epithelium to non-electrolytes. The underlying principles are that concentration gradients of permeant molecules produce lower rates of osmotic flow across a membrane than does the same gradient of an impermeant molecule, and that streaming potentials in the gall-bladder are directly proportional to the flow rate. Hence reflexion coefficients (cr’s) were calculated as the ratio of the streaming potential produced by a 0* 1 m gradient of the test solute to the streaming potential produced by a 0T m gradient of an impermeant reference solute, sucrose. The method yields results in agreement with those obtained in the gall-bladder by a zero-flow procedure. In general, the patterns of permeation derived are similar to those obtained in other tissues by the same procedure, by other osmotic procedures, or by direct chemical or tracer methods. The advantages of the method are that (a) large numbers of cr’s can be determined in one experiment with an average standard deviation of ± 8 % ; and (b) the minimum elapsed time between the preparation of a solution and the determination of or is about 90 s, so that cr’s may be obtained for some non-electrolytes subject to gradual chemical transformation in aqueous solution, such as aldehydes. The principles underlying osmotic methods of measuring permeability, and the effects of unstirred layers, are discussed.

GLC Determination of Residues of Disulfoton, Oxydemetonmethyl, and Their Metabolites in Tobacco Plants

1969 ◽  
Vol 52 (1) ◽  
pp. 157-162
Author(s):  
M C Bowman ◽  
Morton Beroza ◽  
C R Gentry
Keyword(s):  
Plant Extracts ◽  
General Procedure ◽  
Oxidation Products ◽  
Tobacco Plants ◽  
Background Interference ◽  
Ppm Level

Abstract Residues of disulfoton and five of its metabolites on disulfoton-treated tobacco plants were analyzed as follows: Plant extracts were separated into three fractions by liquid chromatograpliy and an aliquot of each was analyzed by GLC, using a flame photometric phosphorus detector. The tobacco caused no background interference in the GLC analysis. Recoveries of five of the six compounds from plants fortified at the 1 ppm level were 88 to 100%; the sixth was unstable in tobacco and its oxidation products were detected. GLC response was linear up to the 250 ng level and the sensitivity was 0,01 to 0.04 ppm. The general procedure was also successfully applied to oxydemetonmethyl and its sulfone, which are chemically similar to two of the disulfoton metabolites.

Automated Nitrogen Method for Feeds

1973 ◽  
Vol 56 (5) ◽  
pp. 1096-1105 ◽  
Author(s):  
Charles W Gehrke ◽  
Larry L Wall ◽  
Joseph S Absheer
Keyword(s):  
Hydrogen Peroxide ◽  
Copper Metal ◽  
Wet Digestion ◽  
Automated Method ◽  
Large Numbers ◽  
Mixed Feeds ◽  
Empirical Standard ◽  
Representative Samples ◽  
Corn Grain

Abstract A totally automated method for the determination of nitrogen in feeds has been developed. The apparatus consists of Technicon Auto-Analyzer modules. The SOLIDprep Sampler II has been interfaced with the continuous digestor to provide complete solubilization and digestion of dry samples of feed, grain, and forage materials. Hydrogen peroxide is used as an aid for the wet digestion in the continuous digestor. Mercury, selenium, or copper metal catalysts were not effective for increasing the recovery of nitrogen during the continuous digestion. Nitrogen recoveries of 88–90%, relative to ammonium sulfate, have been obtained on several materials, i.e., corn grain, wheat, barley, rice, alfalfa, fescue, mixed feeds, and feed concentrates. The recoveries from these materials average about 100±2% when an empirical standard, soy hydrolysate, is used. The system operates at 20 samples/hr and has provided precise and accurate nitrogen analyses on collaborative samples. Other laboratories cooperated with us in evaluating the method by providing representative samples and their Kjeldahl analyses. This method provides a significant reduction in the labor required for large numbers of nitrogen analyses in feeds.

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