The analysis and optimal design of a microstrip sensor for measuring the water content of rubber latex is described. The microstrip structure consists of three layers: substrate, protective layer and semi-infinite lay...
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The analysis and optimal design of a microstrip sensor for measuring the water content of rubber latex is described. The microstrip structure consists of three layers: substrate, protective layer and semi-infinite layer of wet medium. A functional relationship has been developed between the attenuation and the water content of the latex, and close agreement has been found between the computed and experimental results. A computer program has also been developed which optimises the sensitivity for a given water content.
To determine the response type, published data for the most widely used bioassays for gibberellins have been analyzed by means of a computer program for estimating sensitivity parameters, or by interpolation. The dose...
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To determine the response type, published data for the most widely used bioassays for gibberellins have been analyzed by means of a computer program for estimating sensitivity parameters, or by interpolation. The dose response data are almost uniformly subsensitive, i.e. more than an 81-fold increase in external gibberellin concentration is required for a change from 10 to 90% of maximal response (S90/S10). Data for the interaction of gibberellins with artificial membranes are, in contrast, markedly ultrasensitive (S90/S10 < 10). This difference further strengthens the view that lipid structures do not function as receptors for gibberellins. Most of the subsensitive dose responses for gibberellins can be quite precisely represented by cooperative isotherms. However, available data are insufficiently detailed for an unequivocal choice among cooperative, multiphasic or more complex kinetics.
LC50 values for the same compound and the same species may vary considerably within a laboratory and between laboratories. These differences are usually attributed to variable test conditions and response of the test ...
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LC50 values for the same compound and the same species may vary considerably within a laboratory and between laboratories. These differences are usually attributed to variable test conditions and response of the test organisms to the toxicant. Furthermore, the lack of standardization for aquatic toxicity testing may contribute to the variability in LC50 values. To employ toxicity data for regulatory purposes, it may be useful to report one single LC50 value and its associated confidence interval, instead of several LC50 values for each test substance. To accomplish this, a procedure for combining probit lines from several toxicity tests was developed by modifying the maximum likelihood probit method with inclusion of the technique for parallel line probit analysis. The resulting single probit line from this method is referred to as a "grand probit line'' and takes into account separate test results. To ease the calculation a BASIC program was developed for an IBM PC.
A computer program, developed for peak detection of averaged evoked potential waveforms, is described. The program is able to automatically score up to 200 data files in a single session. The user is asked to define i...
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A computer program, developed for peak detection of averaged evoked potential waveforms, is described. The program is able to automatically score up to 200 data files in a single session. The user is asked to define intervals (windows) in which a maximum peak is to be detected. The program can optinally search each EEG channel or a single ''reference'' channel from which all other channels will be compared. The mean amplitude of several data points can also be computed within a particular window. When evoked potentials are particularly noisy, it is possible to estimate the ''signal'' in the higher frequency background ''noise''. Because the program is written in BASIC, it can be readily transferred to many different computer systems.
We extend the analysis in Koziol et al. (J. Immunol. Methods (1987) 105, 139) for the determination of the probability of achieving monoclonality in limiting dilution assays to three or more cloning stages. We also pr...
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We extend the analysis in Koziol et al. (J. Immunol. Methods (1987) 105, 139) for the determination of the probability of achieving monoclonality in limiting dilution assays to three or more cloning stages. We also provide a computer program which will carry out this analysis for an arbitrary number of stages.
In healthy 20- to 50-year-old women, the ABO blood group has a significant effect on levels of von Willebrand factor (VWF:Ag, formerly VIIIR:Ag) and on factor VIII activity (***:C). However, there is no significant ef...
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In healthy 20- to 50-year-old women, the ABO blood group has a significant effect on levels of von Willebrand factor (VWF:Ag, formerly VIIIR:Ag) and on factor VIII activity (***:C). However, there is no significant effect of ABO group or subject age on the ratio loge(***:C/VWF:Ag). Multiple measurements of the "ratio" on possible carriers of hemophilia A may be combined with pedigree information using logistic discrimination to yield final risk assessment. To reduce misclassification of of carriers as normal women, a lower limit, specified by the logistic model, is set on the logistic carrier probabilities. In this study, the proportion of blood group A for a population of obligate carriers was significantly higher than that expected for the general population (60% vs. 42%);for a population of control women it was lower than expected (22.5 vs. 42%). The effect for the carriers came primarily from daughters of affected fathers, as 81.3% were of blood group A. These observations indicate that a "universal" discriminant should be applied with caution.
Data obtained from assays for the evaluation of helper or suppressor activity are analyzed by statistical techniques that increase the accuracy and amount of information. The analysis is performed by a set of simple a...
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Data obtained from assays for the evaluation of helper or suppressor activity are analyzed by statistical techniques that increase the accuracy and amount of information. The analysis is performed by a set of simple and ready to use computer programs which do not require statistical expertise and are available on request.
Many algorithms have been proposed for L 1 simple linear regression computations, and several codes implementing these algorithms are now available. Some of these algorithms are based on a linear programming formulati...
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Many algorithms have been proposed for L 1 simple linear regression computations, and several codes implementing these algorithms are now available. Some of these algorithms are based on a linear programming formulation while others propose a descent approach. We report on a computational study comparing L 1 computer programs for solving the simple linear regression problem.
Using a broiler growout simulation program developed by M. B. Timmons and R. S. Gates, growout temperatures that optimize economic returns from both the grower and integrator point of view were calculated. Depending o...
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Using a broiler growout simulation program developed by M. B. Timmons and R. S. Gates, growout temperatures that optimize economic returns from both the grower and integrator point of view were calculated. Depending on contract terms, temperature settings that maximize returns to the grower can be greatly different from those that maximize returns to the integrator. Optimum winter temperature settings for a typical southeastern location were calculated for a curtain-sided, insulated, and power-ventilated growout building using fixed prices and varying contract terms. After the initial 21-d brooding period, grower optimum temperatures ranged from 10 C below to 5 C above integrator optimum temperatures. The results indicate that there can be a wide disparity in grower and integrator optimum growout temperatures.
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