A rapid and simple method for monitoring the growth of Thiobacillus ferrooxidans is put forward by using a series piezoelectric quartz crystal (SPQC). The SPQC was applied to continuously determine the variation of fr...
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A rapid and simple method for monitoring the growth of Thiobacillus ferrooxidans is put forward by using a series piezoelectric quartz crystal (SPQC). The SPQC was applied to continuously determine the variation of frequency shift during the culture of Thiobacillus ferrooxidans, with a conductive electrode as the probe. The frequency shift as a function of time agrees with a typical 'S - shape' model, a piezoelectric sensor responding well to the growth of Thiobacillus ferrooxidans. The fundamentals for determination of the bacterial growth activity using the SPQC is also described;the frequency shift is only dependent on the electrical conductivity of the solution and the dielectric constant.
The objective of this research work is to evaluate the applicability of selecting the rapid method to replace the conventional standard method for determining heavy metals concentration in the real samples which were ...
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The objective of this research work is to evaluate the applicability of selecting the rapid method to replace the conventional standard method for determining heavy metals concentration in the real samples which were obtained from the textile, electroplating, leather, and food processing industries. Statistical techniques including paired t-test, factor analysis and regression analysis were introduced to compare the analytical results from the above two methods. A comprehensive evaluation of these two methods based on the principle, accuracy, precision, linear range, interference, detection limit ease of operation, and cost analyses is given.
The management of recreational beaches based on the standard methods for E coli or thermotolerant coliforms can present a challenge to public health officials. Typically there is a 30-48h delay between sample collecti...
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The management of recreational beaches based on the standard methods for E coli or thermotolerant coliforms can present a challenge to public health officials. Typically there is a 30-48h delay between sample collection and availability of results. Bacteriological water quality can change significantly during this period. During 1995 and 1996, a rapid method, based on the production of glucoronidase by E coli or galactosidase by thermotolerant coliforms, was developed to shorten this delay. During the summer of 1997, the rapid method was compared to the standard membrane filtration technique for E coli. Using 563 comparisons, the correlation for E coli detected by the rapid method and membrane filtration yielded a r(2)=0.89. The percent agreement between the methods based on the number of times both provided results above or below the provincial objectives of 100 E coli/100mL was 84.6%. Similar results were obtained for 1,168 comparisons of thermotolerant coliform data. Using the rapid method, results for samples collected in the morning are available by the afternoon of the same day. The rapid method not only allows for the prompt closure of beaches but also maximises the times when the beaches are open. (C) 1998 Published by Elsevier Science Ltd on behalf of the IAWQ. All rights reserved.
A rapid method for re‐embedding paraffin sections into epoxy resin for diagnostic electron microscopy is described. The method requires a relatively shorter time than the traditional block retrieval technique and pro...
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A rapid method for re‐embedding paraffin sections into epoxy resin for diagnostic electron microscopy is described. The method requires a relatively shorter time than the traditional block retrieval technique and produces a reasonable quality of ultrastructure for diagnostic purposes.
The management of recreational beaches based on the standard methods for E coli or thermotolerant coliforms can present a challenge to public health officials. Typically there is a 30-48h delay between sample collecti...
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The management of recreational beaches based on the standard methods for E coli or thermotolerant coliforms can present a challenge to public health officials. Typically there is a 30-48h delay between sample collection and availability of results. Bacteriological water quality can change significantly during this period. During 1995 and 1996, a rapid method, based on the production of glucoronidase by E coli or galactosidase by thermotolerant coliforms, was developed to shorten this delay. During the summer of 1997, the rapid method was compared to the standard membrane filtration technique for E coli. Using 563 comparisons, the correlation for E coli detected by the rapid method and membrane filtration yielded a r(2)=0.89. The percent agreement between the methods based on the number of times both provided results above or below the provincial objectives of 100 E coli/100mL was 84.6%. Similar results were obtained for 1,168 comparisons of thermotolerant coliform data. Using the rapid method, results for samples collected in the morning are available by the afternoon of the same day. The rapid method not only allows for the prompt closure of beaches but also maximises the times when the beaches are open. (C) 1998 Published by Elsevier Science Ltd on behalf of the IAWQ. All rights reserved.
A rapid estimate of the total amount of pollutants that may be released in the short or long term from oil shale into the environment can be obtained by stirring 25 g of the shale with 100 ml of water for various peri...
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The content of coagulable protein in juice from tubers of twenty potato varieties was estimated with microbiuret reagent and from Kjeldahl nitrogen. The correlation coefficient was 0.98. The microbiuret method can be ...
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