07 MATEMAATIKA. LOODUSTEADUSED

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Uued standardid

EVS-EN ISO 19250:2013
Hind 13,22 EUR
Water quality - Detection of Salmonella spp. (ISO 19250:2010)
This International Standard specifies a method for the detection of Salmonella spp. (presumptive or confirmed) in water samples. It is possible that, for epidemiological purposes or during outbreak investigations, other media are also required. WARNING - It is possible that the method does not recover all Salmonella ser. Typhi and ser. Paratyphi. NOTE For a semi-quantitative approach, most probable number (MPN) tests can be performed using appropriate sample volumes. For these cases, the volume of the buffered peptone water is adjusted accordingly.

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prEN ISO 16649-3
Tähtaeg 30.06.2013
Microbiology of food and animal feeding stuffs - Horizontal method for the enumeration of beta-glucuronidase-positive Escherichia coli - Part 3: Detection and most probable number technique using 5-bromo-4-chloro-3-indolyl-beta-D-glucuronide (ISO/DIS 16649 3:2013)
This International Standard specifies a horizontal method for the detection and enumeration of B-glucuronidase positive Escherichia coli, by means of the liquid-medium culture technique and calculation of the most probable number (MPN) after incubation at 37 °C, then at 44 °C. This International Standard is applicable to: products intended for human consumption and the feeding of animals; and environmental samples in the area of food production and food handling. The method is suitable for the enumeration of cells of Escherichia coli that may have been subjected to stress arising from dehydration, freezing, exposure to a saline (such as marine) environment or damage by disinfectants such as chlorine-containing products. A limitation of the applicability of this International Standard is imposed by the susceptibility of the method to a large degree of variability. The method should be applied and the results interpreted in the light of the information given in 11. This method has not been fully evaluated for all matrices, e.g. for milk and milk products. ISO 7251 should be used for milk and milk products. WARNING — Strains of Escherichia coli that do not grow at 44 °C and, in particular, those that are -glucuronidase negative, such as Escherichia coli O157 and some other strains of pathogenic E. coli, will not be detected by the method described in this International Standard.
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