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[structure: see text] An indicator-displacement assay was used to study the kinetics of reactions that produce tartrate. The same assay was also found to be useful in developing tartrate test strips, by coating filter paper with the same receptor and indicator.
Backpack spraying of herbicides was examined using a near real-time methodology to characterize the potential for dermal exposure to the spray applicator. Spraying was performed under typical field research conditions on corn and soybean plots during the early growing season. Water-sensitive paper strips, which stain blue upon impingement of spray droplets, were attached uniformly to the applicator on six regions of the body (ankle, midcalf, midthigh, waist, chest, and forearm). Significant exposure was observed on the lower half of the body (ankle, calf, thigh), while the amounts collected on the upper half were minimal. Effects of wind speed and wind orientation to the applicator were negligible, as tested. The height of the boom above the ground, however, had a significant impact on exposure levels. A boom height of less than 48 cm (19 in.) above the ground decreased the mean exposure by more than 50% when compared to boom heights at or greater than 48 cm (19 in.) (i.e., the lower the boom height, the less the exposure). This study investigated only potential dermal exposure and not actual dermal exposure and absorption; nonetheless, the results are indicative of normal backpack application procedures. The water-sensitive paper strips proved to be an inexpensive and reliable monitoring tool.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Padac test strips failed to detect the production of beta-lactamase by 10 strains of penicillin-resistant staphylococci.
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OBJECTIVE: To determine the reliability of seven different alternative glucose test strips manufactured for use with three different glucose meters. RESEARCH DESIGN AND METHODS: Venous blood samples were obtained from volunteers to test trade name glucose test strips on the manufacturers' glucose meters (One Touch II, Glucometer II, and Glucometer III), and the remainder of each sample was used for laboratory determination of blood glucose levels. In addition to the trade name test strips, Quick Check and First Choice test strips were tested on all meters, and Biotel test strips were also tested on the Glucometer III. RESULTS: In linear regression analysis, the R2 ranged from 0.84 to 0.97 for the test strips compared with plasma glucose values. The test strips with the highest accuracy and precision at all ranges of blood glucose levels were the One Touch II and Glucometer III trade name strips and the Quick Check and First Choice alternative strips for the One Touch II glucose meter and the First Choice alternative strip for the Glucometer II. Subgroup analysis based on ranges of blood glucose values, however, revealed that the alternative strips were not as accurate as the trade name test strips, with the exception of the First Choice alternative test strip for the Glucometer II. All of the trade name test strips were more precise than the alternative test strips designed for the individual meters. CONCLUSIONS: Alternative glucose test strips can be used to predict the actual laboratory blood glucose values but are generally not as accurate or precise as the trade name test strips.
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A simple method is described for the preparation of a paper test strip for the rapid detection of the beta-lactamase enzymes of Haemophilus sp., N. gonorrhoeae, S. aureus and S. epidermidis. The test strips were compared with the chromogenic cephalosporin technique for beta-lactamase detection and found to give 100% agreement. The beta-lactamase detection strips were easily prepared, very inexpensive, required no special equipment and could be stored for up to 6 mth.
In 36 unselected insulin-depending type I diabetics the reliability and practicability of the blood glucose self-control was investigated by means of the glucosignal test strip in the course of 12 weeks under everyday ambulatory conditions. In these cases the quality of the manual handling and of the visual evaluation of 896 test strips was judged in three series of application by special personnel in the laboratory by means of photometric evaluation. 7.5% of the test strips of all series were incorrectly handled and could not be evaluated photometrically. The correlation coefficients between the blood glucose concentrations which were visually valuated by the patient and measured photometrically in the laboratory were in the three investigation series 0.962, 0.964, and 0.950, i.e. the patients obtained a great reliability in the visual valuation of the test strips. Altogether 75-90% of all test strips were correctly judged by the patients. Deviations appeared in every case only by one concentration region, whereby there was an unequivocal tendency to underestimation, particularly in higher regions of blood glucose concentration. Prerequisite for a reliable handling of Glucosignal test strip by the patient is a thorough individual training.
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The findings of a ward-based quality assurance scheme for near-patient blood glucose measurement have been analysed statistically. They provide evidence to support an improved analytical performance of a new glucose meter test strip, the Advantage II test strip, which has been in use in our hospital for over a year.
The accuracy and reliability of new blood glucose measurement strips, BM Test-Glycemie 20-800, were assessed in 99 consecutive patients attending the diabetic clinic and seven subjects at home. The BM Test-Glycemie 20-800 strip technique was compared with the automated hexokinase method and the Reflotest-Glucose test strip technique employing the Boehringer Reflomat. The mean of the blood glucose values was 12.6 +/- 0.6 mmol/L for the hexokinase method and 12.9 +/- 0.6 mmol/L for the 20-800 strip technique, with a mean difference between the hexokinase and the 20-800 strip methods of 1.9 +/- 0.2 mmol/L. In the range 4 mmol/L to 12 mmol/L, the 20-800 strips were found to be extremely accurate, but for blood glucose levels less than 3.5 mmol/L and greater than 12 mmol/L, they were less reliable. Importantly, the strips were often misleading in indicating hypoglycaemia. It is concluded that the BM Test-Glycemie 20-800 strips have a practical and valuable role when used by suitably instructed staff members, or by patients in the management of diabetes, and represent a major advance over urine testing on previously available direct reading enzyme strip methods.